EP2454489B1 - Supply and resetting hydraulic unit for a lifting assembly with two separate simultaneously actuated powered bearings - Google Patents

Supply and resetting hydraulic unit for a lifting assembly with two separate simultaneously actuated powered bearings Download PDF

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Publication number
EP2454489B1
EP2454489B1 EP10737952.1A EP10737952A EP2454489B1 EP 2454489 B1 EP2454489 B1 EP 2454489B1 EP 10737952 A EP10737952 A EP 10737952A EP 2454489 B1 EP2454489 B1 EP 2454489B1
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EP
European Patent Office
Prior art keywords
hydraulic
outlet
conduit
lifting
inlet
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP10737952.1A
Other languages
German (de)
French (fr)
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EP2454489A1 (en
Inventor
Philippe Martin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Lohr Industrie SA
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Lohr Industrie SA
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Publication of EP2454489A1 publication Critical patent/EP2454489A1/en
Application granted granted Critical
Publication of EP2454489B1 publication Critical patent/EP2454489B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • F15B11/22—Synchronisation of the movement of two or more servomotors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/315—Directional control characterised by the connections of the valve or valves in the circuit
    • F15B2211/31552—Directional control characterised by the connections of the valve or valves in the circuit being connected to an output member and a return line
    • F15B2211/31558—Directional control characterised by the connections of the valve or valves in the circuit being connected to an output member and a return line having a single output member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or valve
    • F15B2211/40523—Flow control characterised by the type of flow control means or valve with flow dividers
    • F15B2211/4053—Flow control characterised by the type of flow control means or valve with flow dividers using valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/505—Pressure control characterised by the type of pressure control means
    • F15B2211/50509—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
    • F15B2211/50545—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using braking valves to maintain a back pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/78—Control of multiple output members
    • F15B2211/782—Concurrent control, e.g. synchronisation of two or more actuators

Definitions

  • the present invention relates to a hydraulic block balancing and registration for a lifting assembly with two independent motor hydraulic elements which are to ensure at all times identical positioning.
  • Certain vehicles and in particular car-carrying vehicles, are equipped with platforms or trays intended to carry loads and whose height can be modified to facilitate the loading and unloading operations.
  • Each of these gantries comprises two twin poles or lifting arms placed on each side of the vehicle, one on the right and the other on the left.
  • Each of the columns or lifting arms is equipped with a hydraulic lifting device, conventionally with a hydraulic screw motor or with a hydraulic jack, making it possible to modify the inclination of the lifting arm or the height of the point of recovery of the plate, and thus to vary the level of the supported board.
  • the object of the invention is to provide a device that allows to recalibrate with respect to each other, the two hydraulic lifting devices right and left of each lifting crane in case of poor synchronization of their movement resulting in a lack of horizontality.
  • the left and right hydraulic lifting devices are hydraulic screw motors, these are conventionally fed in series. It is then quite easy to perform a registration of the two engines together, at the request of the operator, by stopping feeding one of them by means of a simple derivation.
  • the non-powered screw motor then stops, remains stationary in the same position and maintains the load it supports, while the second screw motor continues its movement until ending up in a position identical to the first.
  • the power supply of the two screw motors can then be restored so that the movement continues synchronized way.
  • Hydraulic lifting cylinders are conventionally supplied in parallel and not in series as the hydraulic screw motors, it is necessary to achieve a sharing of hydraulic fluid to feed each of the cylinders simultaneously.
  • the invention responds to this congestion problem by eliminating this very bulky mechanical torsion connection and by providing a particularly compact and bulky system.
  • the lift arms remain mechanically independent.
  • the resetting device according to the invention can be actuated at any time by the operator and thus advantageously makes it possible to correct a synchronization defect of the movement of the two right and left lifting devices whatever the position of the platform raised. .
  • the piston of the cylinders is equipped with a peripheral seal that must pass regularly on the inlet perforation of the discharge path which causes a gradual degradation of the seal. If the seal is not replaced in time, micro-leaks may appear at this level and maintenance of the load is no longer ensured. Such a situation is not acceptable for cylinders to guarantee the safety of maintenance.
  • the resetting device according to the invention does not have such drawbacks.
  • the device according to the invention performs several functions simultaneously. It controls the descent of the raised load, it divides the flow of the hydraulic fluid and it ensures a resetting of the hydraulic lifting devices as soon as the operator requests it and whatever the position of these hydraulic devices at that moment.
  • hydraulic block all of these functions are integrated within a compact housing called hydraulic block. It can thus be easily installed on a vehicle and this despite the congestion problems that still exist for this type of application. It can also be easily connected to the hydraulic circuit by limiting the number of links used. Editing is simplified and costs are improved.
  • the invention provides a hydraulic block intended to be mounted on a vehicle, in particular a car transporter vehicle, which comprises at least one platform or a platform for carrying a load and whose height is modifiable, this platform or platform being supported by at least one lifting gantry formed by two mechanically independent lifting arms, respectively right and left, each of these lifting arms being equipped with an independent hydraulic lifting device for varying the height of the platform or platform that it supports.
  • the reset solenoid valve is in its first position during the simultaneous normal operation of the two hydraulic lifting devices for raising or lowering the plate or the platform and passes in its second position to proceed with the registration of the hydraulic devices.
  • the invention also relates to a vehicle, in particular a car transporter, which comprises at least one platform or platform for carrying a load and the height of which can be modified, this platform or platform being supported by at least one lifting gantry consisting of two mechanically independent lifting arms, respectively right and left, each of these lifting arms being equipped with an independent hydraulic lifting device for varying the height of the platform or platform that it supports, vehicle in which each of the lifting cranes is equipped with a hydraulic block according to the invention connected to the hydraulic lifting devices of the gantry concerned.
  • a vehicle in particular a car transporter, which comprises at least one platform or platform for carrying a load and the height of which can be modified, this platform or platform being supported by at least one lifting gantry consisting of two mechanically independent lifting arms, respectively right and left, each of these lifting arms being equipped with an independent hydraulic lifting device for varying the height of the platform or platform that it supports, vehicle in which each of the lifting cranes is equipped with a hydraulic block according to the invention connected to the hydraulic lifting devices of the gantry concerned.
  • a hydraulic block 1 according to the invention is shown mounted on the bitter side of a vehicle 2, in particular a car transporter according to a preferred but nonlimiting example of application of the invention. 'invention.
  • the hydraulic block 1 shown is mounted on the frame 3 of the vehicle 2, under the lower plate 4 of the vehicle. It allows to feed and control two hydraulic lifting devices, respectively left 5 and right 6, which actuate the left and right lifting arms of a hoist gantry not shown.
  • the lifting hydraulic devices 5 and 6 can operate indifferently arms, posts, uprights, supports or any other elements of a lifting assembly supporting a platform or a platform of variable height.
  • arms, posts, uprights, supports or any other elements of a lifting assembly supporting a platform or a platform of variable height For simplicity, we will designate all these elements, whatever their exact nature, by the term arm in the remainder of this description and in the claims, without any desire to limit.
  • the hydraulic lifting devices 5 and 6 shown in this figure are hydraulic cylinders 7 and 8 and more precisely secure hydraulic cylinders 9 and 10.
  • the use of the hydraulic block 1 according to the invention is not limited to this type of secure hydraulic cylinders 9, 10.
  • the hydraulic block 1 of the invention can also be used with conventional hydraulic cylinders 7, 8, or even with hydraulic lifting devices 5, 6 of different nature. like screw motors for example.
  • a hydraulic block 1 according to the invention is preferably connected to the hydraulic lifting devices 5 and 6 of each of the lifting cranes of the vehicle.
  • the hydraulic block 1 is preferably located between the two lifting arms of the gantry concerned, for example substantially at the longitudinal axis of the vehicle and thus approximately in the middle of the two arms. for lifting, or for example, as shown, on one of the sides of the vehicle, preferably the one where the block of hydraulic controls, manual or electrical, the two hydraulic lifting devices 5, 6 concerned.
  • the hydraulic block 1 is connected by two supply links 13 to the hydraulic fluid reservoir, via the hydraulic control unit of the lifting devices concerned. It is also connected by a set of distribution links 14 to the two hydraulic lifting devices 5 and 6.
  • the distribution links 14 are three in number by jack and end at the level of the securing device 15 or 16 of each jack 9, 10.
  • links 13 and 14 may indifferently be made, in whole or in part, in the form of hoses or rigid hydraulic tubes.
  • the hydraulic block 1 of the invention is represented alone on the Figures 2 and 3 . It preferably comprises a compact body 17 which encloses the hydraulic circuit and the hydraulic components of the block 1.
  • This body 17 is for example in the form of a substantially parallelepipedal block, in which different holes have been machined so as to form housings for the reception of the hydraulic components 18 necessary for the operation of the hydraulic block 1 and the ducts 19 of FIG. passage for the hydraulic fluid.
  • ducts 19 form a hydraulic circuit which will be detailed later.
  • the ducts 19 open out of the body 17 through holes 20 whose size and shape are adapted to introduce the end of a connection 13 or 14 and make a tight connection at this level between the connection and the conduit 19 concerned.
  • each inlet and / or outlet duct of the hydraulic circuit of the block 1, or only some of them can lead to the outside of the body 17 by several orifices 20 equivalents, located at different locations of the body 17 and preferably on different faces thereof to ensure that at least one of these orifices 20 remain always physically accessible. It is thus possible to easily make the hydraulic connections regardless of the position and size of the mounting area of the block 1, and the orientation of the block in the mounted position. Unused openings are closed by means of plugs or any other sealing means.
  • the hydraulic block 1 shown contains three main hydraulic components 18: a balancing valve 21, a flow divider 22 and a resetting solenoid valve 23.
  • the balancing valve 21 is not essential in all applications. When it is present, its function is to brake the descent of the trays, which represent a downhill driving load, and to control their descent movement so that it is progressive and not too fast.
  • the balancing valve 21 opens only when the inlet pressure of the fluid is sufficient. It thus establishes at the level of the valve 21 an automatic and progressive balancing between the inlet pressure of the fluid and the weight of the descending load.
  • the balancing valve 21 fulfills an additional function when the hydraulic lifting devices 5, 6 are secured cylinders 9, 10 comprising a securing device 15, 16 with valves as shown schematically on the Figures 10 to 13 .
  • the balancing valve 21 keeps the return closed as long as the valves of the securing devices 15, 16 of the secured hydraulic cylinders 9, 10 are closed thus providing additional security. For this, it requires for its opening, the application of an opening pressure greater than that opening the safety valves cylinders. The valves of the securing devices 15, 16 of the cylinders thus open before allowing the descent of the load by the opening of the balancing valve 21.
  • the flow divider 22 is a static flow divider whose function is to balance the passage of the hydraulic fluid passing through it by creating from a single input flow two flow flows of identical flow rate. This component works regardless of the direction of fluid flow. In the opposite direction, it regulates the flow of the input streams and lets two identical flow input streams pass to recompose a single output stream.
  • the flow divider performs its balancing function regardless of the load of the two cylinders and even in the case where the two loads are not identical.
  • the reset solenoid valve 23 is a three-way and two-position solenoid valve. It is busy as long as the operator does not control the resetting of hydraulic lifting devices 5, 6 for example by pressing a button provided for this purpose. It is preferably a solenoid valve with valves that offers a better sealing guarantee that a solenoid valve with drawers.
  • the inlets and outlets of the hydraulic block 1 have not been doubled and the hydraulic block 1 has been specially designed to cooperate with hydraulic devices 5, 6 each requiring only two fluid passageways used. alternately in both directions depending on the direction of operation of the hydraulic devices 5 and 6.
  • These hydraulic devices 5, 6 are for example conventional hydraulic cylinders 7 and 8 having no security system.
  • the maintenance of the position of the trays, once the height adjustment has been carried out and in particular during the driving, is not guaranteed by a hydraulic lock on the hydraulic lifting devices 5 and 6.
  • This maintenance must be ensured. in another way, for example by the establishment by the operator of lateral pins at the jacks 7 and 8 or at the level of the lifting arms, or by any other means of mechanical locking or other.
  • the hydraulic devices 5, 6 shown on the Figures 4 to 8 are double-acting cylinders 7, 8 which conventionally have a cylindrical body 24, 25 enclosing a large chamber 26, 27 and a small chamber 28, 29 separated by a piston 30, 31 from which the rod 11 or 12 extends corresponding cylinder.
  • the hydraulic block 1 is connected to the hydraulic fluid reservoir, via the hydraulic control block, by two supply links 13, one bringing the fluid to the inlet of the system and the other ensuring the return of the fluid to the tank alternatively according to the direction of operation of the cylinders 7, 8.
  • the device When the operator controls the rise of the tray without asking for a resetting, the device is in the situation represented on the figure 5 .
  • the hydraulic block 1 is supplied with hydraulic fluid through its orifice B, the fluid coming under pressure in the conduit 32.
  • the fluid meets a first conduit 33 whose end is closed at the resetting solenoid valve 23 in this configuration of the device.
  • the fluid therefore progresses to the balancing valve 21 which is in the closed position. It bypasses it by a bypass duct 34 in which is inserted a valve 35 which it crosses in the direction, which allows it to reach a distribution point 36 at T where it separates in two flows progressing in the ducts 37 and 38 in order to feed each of the large chambers, respectively 26 or 27 of one of the cylinders 7 or 8.
  • the hydraulic fluid in the small chamber 28, 29 of the cylinders 7, 8 is expelled from the cylinders by the links 14 and returns to the hydraulic block 1 at the ducts 39 and 40 thereof.
  • the fluid progressing in the duct 39 arrives directly on one of the input channels of the flow divider 22.
  • the one progressing in the duct 40 first encounters the resetting solenoid valve 23.
  • the solenoid valve 23 passes for the fluid passing through it and is found via the duct 41 on the other input channel of the flow divider 22.
  • the flow divider 22 operates here in flow recomposition and operates so that the two incoming flows are of identical flow rate on each of its input channels regardless of the load of the two cylinders. It thus ensures synchronization of the operation of the two jacks 7 and 8.
  • the flow divider 22 forms a single output stream that escapes through the conduit 42 and out of the hydraulic block 1 through its port A to return to tank by means of one of the supply links 13, via the hydraulic control block.
  • the hydraulic fluid progresses in the conduit 42 on which is grafted a conduit 43 for controlling the balancing valve 21.
  • the pressure of the fluid is not sufficient to push the balancing valve 21 in the open position.
  • the hydraulic fluid arrives at the inlet of the flow divider 22 which separates it into two identical flow flows sent in the ducts 39 and 41.
  • the fluid progressing in the duct 39 will directly fill the small chamber 28 of the left ram 7, while that progressing in the duct 41 passes first through the reset solenoid valve 23 in the pass position before going to feed the small chamber 29 of the right cylinder 8 via duct 40.
  • the hydraulic fluid of the large chambers 26, 27 of the cylinders 7, 8 is expelled towards the hydraulic block 1 and in the ducts 37 and 38 thereof.
  • the flow divider can indifferently be placed in the hydraulic circuit on the side of the large chambers 26, 27 or on the side of the small chambers 28, 29 of the cylinders 7 and 8. Its position could thus be perfectly exchanged with that of the distribution point 36.
  • the operation of the flow divider 22 is by nature imperfect, it happens that a shift appears resulting in a failure of synchronization of the cylinders 7 and 8.
  • the operator controls the registration of the device by activating the solenoid valve. resetting 23 for example by depressing a control button and holding it down until the registration is complete and the two cylinders again synchronized. This registration operation can be performed regardless of the direction of operation of the cylinders and whatever their position.
  • the resetting consists in stopping one of the cylinders while isolating it, while the second continues to operate, the operator ordering the situation depending on the situation, the exit or retraction of his rod until the difference between the two jacks has been overtaken.
  • the cylinder isolated during the resetting operation is the right cylinder 8.
  • the jack isolated during the registration is preferably the one located on the opposite side of the manual controls so that the operator is on the side of the active cylinder to better see and control its movement.
  • the solenoid valve 23 When the operator controls the resetting, the solenoid valve 23 is energized and is placed in the reset position as shown in FIG. Figures 7 and 8 . In this position, the duct 33 is no longer closed and is placed in communication with the duct 41 through the solenoid valve 23.
  • the duct 40 which communicates with the small chamber 29 of the right jack 8, terminates at the level of the solenoid valve 23 by a valve in the closed position.
  • the fluid contained in the small chamber 29 can no longer escape, thus making it impossible to move the piston 31 and thereby any movement of the rod 12 of the cylinder 8 which is isolated and therefore immobilized.
  • the system When, in order to perform the registration, the operator must control the output of the left cylinder 7 (height adjustment upwards), the system is in the configuration shown on the figure 7 .
  • a portion of the fluid passes through the conduit 33 and passes through the reset solenoid valve 23 to reach one of the two input channels of the flow divider 22 via the conduit 41.
  • the remaining fluid bypasses the balancing valve 21 in the closed position by the bypass duct 34 and reaches the distribution point 36.
  • the expelled fluid arrives directly to the other input channel of the flow divider 22, which recomposes a single output stream from the two flows arriving from the ducts 39 and 41.
  • This output stream exits through the duct 42, which communicates with the conduit 43.
  • This output fluid does not have sufficient pressure to push the balancing valve 21 in the open position. It escapes out of the hydraulic block 1 to return to the tank via the hydraulic control block.
  • the system When, in order to carry out the registration, the operator controls the retraction of the left jack 7 (height adjustment downwards), the system is in the configuration represented on the figure 8 .
  • the hydraulic fluid enters the hydraulic block 1 via the duct 42, and pushes the equilibration valve 21 to the open position via the duct 43.
  • the fluid progressing in the duct 41 passes through the reset solenoid valve 23 and is returned out of the hydraulic block 1 to the hydraulic control block and the reservoir, via the ducts 33 and 32, while the one progressing in the duct 39 will fill the small chamber 28 of the left cylinder 7 and thus cause the retraction of the rod 11 of the cylinder.
  • the hydraulic fluid present in the large chamber 26 of the cylinder 7 is expelled through the conduit 37 of the hydraulic block 1.
  • the right cylinder 8 is blocked, the fluid is forced, at the distribution point 36, to go towards the balancing valve 21 it crosses to join the conduit 32 and return to the tank via the hydraulic control block by means of the supply link 13.
  • the operator stops the registration, for example by releasing the control button.
  • the operation of the two cylinders can then continue in a conventional and synchronized manner, according to one of the two normal operating modes detailed above.
  • FIG. 9 to 13 there is shown a second embodiment of the hydraulic block 1 of the invention more particularly designed to be connected to two secured cylinders 9 and 10.
  • Such hydraulic devices 5, 6 each require three fluid passageways, two being used alternately in both directions depending on the direction of operation of the cylinders and the third serving for the operation of the securing device 15, 16.
  • This arrangement of the additional outlet ducts 45 and 46 corresponds to a constructive and representational facility.
  • these additional outlet ducts 45, 46 can be connected, indifferently to one another, to any point of the connecting duct 33 or to any point of the first inlet duct 32 located before the balancing valve 21 when the first inlet duct 32 has one.
  • the hydraulic block 1 could contain only one additional outlet duct connected to the connecting duct 33 or to the inlet duct 32, the two connections 14 necessary for the operation of the securing devices of the secured cylinders can, for example, be interconnected outside the hydraulic block 1.
  • each of the outputs of the hydraulic block 1 is advantageously doubled by another equivalent output disposed on another face of the block.
  • the inlet duct 42 thus divides into two ducts 47 and 48 opening respectively through the orifices A1 and A2.
  • the inlet duct 32 is also divided into two ducts 49 and 50 which open respectively through the orifices B1 and B2.
  • the outlet ducts 37, 38, 39 and 40 are each divided into two ducts, respectively 51 and 52, 53 and 54, 55 and 56, and 57 and 58, which open respectively through the orifices B11 and B12, B13 and B14, A11 and A12, and A13 and A14.
  • the additional outlet ducts 45 and 33 are each divided into two ducts, respectively 59 and 60, and 46 and 61, which open respectively through the orifices T11 and T12, and T13 and T14.
  • the operator can thus choose the orifices he wants to use according to his needs and the accessibility of the mounting area of the hydraulic block 1.
  • the unused orifices are closed, for example by means of simple plugs.
  • This preferred embodiment of the hydraulic block can also be used with simple hydraulic devices 5, 6 each requiring only two fluid passage ways, such as, for example, conventional hydraulic cylinders 7 and 8 that do not have a securing system. It suffices to condemn the additional outlet ducts that are not necessary in such an application, simply closing the orifices T11, T12, T13 and T14.
  • this preferential hydraulic block is similar to that of the basic variant and can be easily deduced by the observation of Figures 10 to 13 . In these figures, it is not shown the doubling of the outputs detailed above, for the sake of simplification to facilitate the understanding of the reader.
  • the figures 10 and 11 correspond to the normal operation of the lifting system without request for registration by the operator, in the direction of the simultaneous output of the rods 11 and 12 of the cylinders 9 and 10 for the figure 10 and their simultaneous re-entry for the figure 11 .
  • the securing devices 15 and 16 guarantee the holding in position of the cylinders 9, 10.
  • the securing devices 15, 16 of the cylinders 9, 10 further include a control means 66, 67 with a slide, the piston of which, respectively 68 and 69, can mechanically open the safety valves 62, 63 and 64, 65 when the pressure is sufficient in the control conduit 70, 71.
  • control means 66 and 67 are also connected, via the ducts 72 and 73 and a distribution link 14, to the additional outlet ducts 45 and 46 of the hydraulic block 1.
  • the registration operation represented on the figures 12 and 13 is performed as previously by isolation of one of the cylinders 9 or 10 whose operation is stopped while the other cylinder continues its movement.
  • the hydraulic block preferably comprises no hydraulic component 18 between the balancing valve 21 and the securing device 15, 16 of the secured cylinders. Indeed, such hydraulic components could interfere with the operation of these securing devices 15, 16.
  • the flow divider 22 is preferably placed on the branch of the circuit not connected to the securing devices 15, 16.
  • the securing devices are arranged on the side of the large chamber 26, 27 of the cylinders, the flow divider 22 is thus placed on the branch of the circuit connected to the small chambers 28 and 29 of the secured cylinders.
  • the situation can be perfectly reversed in another embodiment of the invention.
  • hydraulic block according to the invention with hydraulic screw motors instead of hydraulic cylinders, which would make it possible to supply these hydraulic motors in parallel and no longer in series, and thus can be reduced. their power.
  • the valve balancing 21 is no longer necessary and can be removed from the hydraulic block 1.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)

Description

La présente invention concerne un bloc hydraulique d'équilibrage et de recalage pour un ensemble de levage à deux éléments hydrauliques moteurs indépendants dont on veut assurer à tout moment un positionnement identique.The present invention relates to a hydraulic block balancing and registration for a lifting assembly with two independent motor hydraulic elements which are to ensure at all times identical positioning.

Certains véhicules et notamment les véhicules porte-voitures, sont équipés de plateformes ou de plateaux destinés à porter des charges et dont la hauteur peut être modifiée pour faciliter les opérations de chargement et de déchargement.Certain vehicles, and in particular car-carrying vehicles, are equipped with platforms or trays intended to carry loads and whose height can be modified to facilitate the loading and unloading operations.

Ces plateaux sont supportés par un ensemble de portiques de levage dont le nombre varie en fonction de l'emplacement et de la longueur du plateau. Chacun de ces portiques comprend deux poteaux ou bras de levage jumelés placés de chaque côté du véhicule, l'un à droite et l'autre à gauche.These trays are supported by a set of lifting cranes whose number varies depending on the location and length of the tray. Each of these gantries comprises two twin poles or lifting arms placed on each side of the vehicle, one on the right and the other on the left.

Chacun des poteaux ou bras de levage est équipé d'un dispositif hydraulique de levage, classiquement à moteur hydraulique à vis ou à vérin hydraulique, permettant de modifier l'inclinaison du bras de levage ou la hauteur du point de reprise du plateau, et ainsi de faire varier le niveau du plateau supporté.Each of the columns or lifting arms is equipped with a hydraulic lifting device, conventionally with a hydraulic screw motor or with a hydraulic jack, making it possible to modify the inclination of the lifting arm or the height of the point of recovery of the plate, and thus to vary the level of the supported board.

Afin d'éviter un endommagement de la charge transportée ou du plateau porteur lui-même sous l'effet de contraintes de torsion indésirables, il est indispensable que le mouvement des dispositifs hydrauliques de levage soit synchronisé pour les deux bras d'un même portique de levage.In order to avoid damage to the transported load or the carrier plate itself under the effect of undesirable torsional stresses, it is essential that the movement of the hydraulic lifting devices is synchronized for the two arms of the same gantry crane. lifting.

Une telle synchronisation dans le positionnement des deux dispositifs hydrauliques droite et gauche de chaque portique de levage est nécessaire pour que le plateau soulevé reste droit et horizontal et ne s'incline pas latéralement.Such synchronization in the positioning of the two right and left hydraulic devices of each lifting gantry is necessary so that the raised platform remains straight and horizontal and does not tilt laterally.

Le but de l'invention est de proposer un dispositif qui permet de recaler l'un par rapport à l'autre, les deux dispositifs hydrauliques de levage droite et gauche de chaque portique de levage en cas de mauvaise synchronisation de leur mouvement se traduisant par un défaut d'horizontalité.The object of the invention is to provide a device that allows to recalibrate with respect to each other, the two hydraulic lifting devices right and left of each lifting crane in case of poor synchronization of their movement resulting in a lack of horizontality.

Lorsque les dispositifs hydrauliques de levage droite et gauche sont des moteurs hydrauliques à vis, ceux-ci sont classiquement alimentés en série. Il est alors assez facile de réaliser un recalage des deux moteurs entre eux, à la demande de l'opérateur, en cessant d'alimenter l'un deux au moyen d'une simple dérivation. Le moteur à vis non alimenté s'arrête alors, reste immobile dans la même position et maintien la charge qu'il supporte, tandis que le deuxième moteur à vis poursuit son mouvement jusqu'à se retrouver dans une position identique au premier. L'alimentation des deux moteurs à vis peut alors être rétablie pour que le mouvement se poursuive de façon synchronisée.When the left and right hydraulic lifting devices are hydraulic screw motors, these are conventionally fed in series. It is then quite easy to perform a registration of the two engines together, at the request of the operator, by stopping feeding one of them by means of a simple derivation. The non-powered screw motor then stops, remains stationary in the same position and maintains the load it supports, while the second screw motor continues its movement until ending up in a position identical to the first. The power supply of the two screw motors can then be restored so that the movement continues synchronized way.

Lorsque les dispositifs hydrauliques de levage droite et gauche sont des vérins hydrauliques alimentés en parallèles, la situation est plus délicate. En effet, si l'on cesse d'alimenter un vérin hydraulique, par exemple en réalisant une dérivation, l'autre vérin ne peut pas rester en position et s'effondre.When the right and left hydraulic lifting devices are hydraulic cylinders fed in parallel, the situation is more delicate. Indeed, if one ceases to supply a hydraulic cylinder, for example by making a bypass, the other cylinder can not remain in position and collapses.

Les vérins hydrauliques de levage étant classiquement alimentés en parallèle et non en série comme les moteurs hydrauliques à vis, il est nécessaire de réaliser un partage du fluide hydraulique afin d'alimenter chacun des vérins simultanément. Or, il n'existe actuellement aucun dispositif satisfaisant permettant de diviser le flux de fluide hydraulique de manière stable et parfaitement égale, sans apparition au bout d'un moment d'une différence de débit entre les deux branches. Une telle différence se traduit automatiquement par un décalage entre les deux vérins de levage qui ne sont plus synchronisés et une inclinaison de la plateforme apparaît.Hydraulic lifting cylinders are conventionally supplied in parallel and not in series as the hydraulic screw motors, it is necessary to achieve a sharing of hydraulic fluid to feed each of the cylinders simultaneously. Now, there is currently no satisfactory device for dividing the flow of hydraulic fluid stably and perfectly equal, without appearance after a moment of a difference in flow between the two branches. Such a difference automatically results in an offset between the two lifting cylinders which are no longer synchronized and an inclination of the platform appears.

Un dispositif permettant de recaler les deux vérins hydrauliques entre eux lorsqu'un tel défaut se produit, quelle que soit la position des deux vérins à ce moment-là, apparaît fortement souhaitable, voire indispensable.A device for recalibrating the two hydraulic cylinders together when such a fault occurs, whatever the position of the two cylinders at that time, appears highly desirable, even essential.

C'est à ce problème que répond l'invention.It is to this problem that the invention responds.

Pour éviter les défauts de synchronisation entre les deux bras de levage, on a tenté dans l'art antérieur de les jumeler mécaniquement au moyen d'une liaison mécanique du type barre de torsion. Il s'agit en fait d'un tube de liaison qui s'étend transversalement au véhicule et relie entre eux les deux bras de levage. Cette liaison mécanique oblige les deux bras à avoir un mouvement globalement synchronisé. Un léger décalage d'amplitude acceptable, induit par la déformation de torsion, reste néanmoins possible.To avoid synchronization failures between the two lifting arms, it has been attempted in the prior art to couple them mechanically by means of a mechanical connection of the torsion bar type. It is actually a connecting tube that extends transversely to the vehicle and connects the two lifting arms. This mechanical connection forces both arms to have a globally synchronized movement. A slight offset of acceptable amplitude, induced by the torsional deformation, remains nevertheless possible.

Malheureusement, ce système antérieur de jumelage mécanique n'est pas satisfaisant car il est difficile à mettre en place et surtout car il prend beaucoup de place sur le véhicule. Or, il est bien connu que l'espace disponible pour les systèmes opérationnels est particulièrement limité dans les véhicules de ce type, le volume libre de chargement réservé à la charge transportée devant être le plus grand possible. L'encombrement causé par les dispositifs fonctionnels du véhicule est un problème crucial et la réduction de ce volume perdu est un enjeu concurrentiel considérable.Unfortunately, this prior system of mechanical twinning is not satisfactory because it is difficult to set up and especially because it takes up a lot of space on the vehicle. However, it is well known that the space available for operational systems is particularly limited in vehicles of this type, the free volume of loading reserved for the load transported to be the largest possible. The congestion caused by the functional devices of the vehicle is a crucial problem and the reduction of this lost volume is a considerable competitive issue.

L'invention répond à ce problème d'encombrement en supprimant cette liaison mécanique de torsion très encombrante et en fournissant un système particulièrement compact et peu volumineux. Avantageusement, avec le système de l'invention, les bras de levage restent mécaniquement indépendants.The invention responds to this congestion problem by eliminating this very bulky mechanical torsion connection and by providing a particularly compact and bulky system. Advantageously, with the system of the invention, the lift arms remain mechanically independent.

Un autre système de recalage, sans liaison mécanique de torsion, a été (voir US 2007/017 364 ) développé dans l'art antérieur laissant les deux bras mécaniquement indépendants. Il s'agit d'un système interne aux vérins hydrauliques de levage. Ces vérins comportent une voie de décharge du fluide hydraulique débouchant dans la paroi de leur cylindre par une perforation accessible uniquement lorsque le vérin se trouve en position haute. Ainsi, lorsque l'un des vérins est décalé et arrive en avance en position haute, le fluide hydraulique l'alimentant part dans la voie de décharge à travers la perforation devenue accessible, alors que le deuxième vérin continue à monter jusqu'à arriver lui aussi en position haute. On aboutit ainsi à une resynchronisation des deux vérins.Another registration system, without mechanical torsion connection, was (see US 2007/017364 ) developed in the prior art leaving the two arms mechanically independent. It is an internal system with hydraulic lifting cylinders. These cylinders comprise a discharge path of the hydraulic fluid opening into the wall of their cylinder by a perforation accessible only when the cylinder is in the upper position. Thus, when one of the cylinders is shifted and arrives early in the high position, the hydraulic fluid feeding it leaves in the discharge path through the perforation become accessible, while the second cylinder continues to rise until it reaches him. also in the high position. This leads to a resynchronization of the two cylinders.

Cependant, ce système antérieur ne permet de rétablir la synchronisation qu'en position haute finale du plateau qui correspond à la position de fin de course des deux dispositifs hydrauliques de levage. Aucun réglage n'est possible en position intermédiaire du plateau, car les perforations donnant accès aux circuits de décharge sont alors masquées. L'opérateur ne peut qu'observer impuissant l'apparition d'un défaut de synchronisation lorsqu'il se produit au cours de la montée ou de la descente de la charge soulevée.However, this prior system only makes it possible to restore synchronization in the final high position of the plate which corresponds to the end position of the two hydraulic lifting devices. No adjustment is possible in the intermediate position of the tray, because the perforations giving access to the discharge circuits are then masked. The operator can only watch helplessly the appearance of a synchronization fault when it occurs during the rise or the descent of the raised load.

Au contraire, le dispositif de recalage selon l'invention peut être actionné à tout moment par l'opérateur et il permet ainsi avantageusement de corriger un défaut de synchronisation du mouvement des deux dispositifs de levage droite et gauche quelle que soit la position du plateau soulevé.On the contrary, the resetting device according to the invention can be actuated at any time by the operator and thus advantageously makes it possible to correct a synchronization defect of the movement of the two right and left lifting devices whatever the position of the platform raised. .

En outre, dans ce système antérieur, le piston des vérins est équipé d'un joint d'étanchéité périphérique qui doit passer régulièrement sur la perforation d'entrée de la voie de décharge ce qui entraîne une dégradation progressive du joint. Si le joint d'étanchéité n'est pas remplacé à temps, des microfuites peuvent apparaître à ce niveau et le maintien de la charge n'est alors plus assuré. Une telle situation n'est pas acceptable pour des vérins devant garantir la sécurité du maintien.In addition, in this prior system, the piston of the cylinders is equipped with a peripheral seal that must pass regularly on the inlet perforation of the discharge path which causes a gradual degradation of the seal. If the seal is not replaced in time, micro-leaks may appear at this level and maintenance of the load is no longer ensured. Such a situation is not acceptable for cylinders to guarantee the safety of maintenance.

Avantageusement, le dispositif de recalage selon l'invention ne présente pas de tels inconvénients.Advantageously, the resetting device according to the invention does not have such drawbacks.

Le dispositif selon l'invention réalise plusieurs fonctions simultanément. Il maîtrise la descente de la charge soulevée, il divise le débit du fluide hydraulique et il assure un recalage des dispositifs hydrauliques de levage dès que l'opérateur le demande et quelle que soit la position de ces dispositifs hydrauliques à ce moment-là.The device according to the invention performs several functions simultaneously. It controls the descent of the raised load, it divides the flow of the hydraulic fluid and it ensures a resetting of the hydraulic lifting devices as soon as the operator requests it and whatever the position of these hydraulic devices at that moment.

En outre, l'ensemble de ces fonctions est intégré au sein d'un boîtier compact appelé bloc hydraulique. Il peut ainsi être facilement installé sur un véhicule et ceci malgré les problèmes d'encombrement qui existent toujours pour ce type d'application. Il peut de plus être aisément raccordé au circuit hydraulique en limitant le nombre de liaisons utilisées. Le montage est simplifié et les coûts sont améliorés.In addition, all of these functions are integrated within a compact housing called hydraulic block. It can thus be easily installed on a vehicle and this despite the congestion problems that still exist for this type of application. It can also be easily connected to the hydraulic circuit by limiting the number of links used. Editing is simplified and costs are improved.

Pour résoudre ce problème technique, l'invention fournit un bloc hydraulique destiné à être monté sur un véhicule, notamment un véhicule porte-voitures, qui comprend au moins un plateau ou une plateforme permettant de transporter une charge et dont la hauteur est modifiable, ce plateau ou plateforme étant supporté par au moins un portique de levage formé de deux bras de levage mécaniquement indépendants, respectivement droite et gauche, chacun de ces bras de levage étant équipé d'un dispositif hydraulique de levage indépendant permettant de faire varier la hauteur du plateau ou plateforme qu'il supporte.To solve this technical problem, the invention provides a hydraulic block intended to be mounted on a vehicle, in particular a car transporter vehicle, which comprises at least one platform or a platform for carrying a load and whose height is modifiable, this platform or platform being supported by at least one lifting gantry formed by two mechanically independent lifting arms, respectively right and left, each of these lifting arms being equipped with an independent hydraulic lifting device for varying the height of the platform or platform that it supports.

Selon l'invention, ce bloc hydraulique comprend les composants hydrauliques suivants :

  • un diviseur de débit qui présente une voie d'entrée et deux voies de sortie et qui régule l'écoulement du fluide pour obtenir deux flux de débit identique sur ses deux voies de sortie quel que soit le sens de l'écoulement du fluide, et
  • une électrovanne de recalage à deux positions et à une voie d'entrée et deux voies de sorties, qui, dans sa première position, est passante de sa voie d'entrée à sa première voie de sortie, sa deuxième voie de sortie étant bloquée, et qui, dans sa deuxième position, est passante de sa voie d'entrée à sa deuxième voie de sortie, sa première voie de sortie étant bloquée.
According to the invention, this hydraulic block comprises the following hydraulic components:
  • a flow divider which has an input channel and two output channels and which regulates the flow of the fluid to obtain two flows of identical flow rate on its two output channels irrespective of the direction of the flow of the fluid, and
  • a two position reset solenoid valve and an input channel and two output channels, which in its first position is passing from its input channel to its first output channel, its second output channel being blocked, and which, in its second position, is passing from its entry way to its second exit route, its first exit route being blocked.

Ces composants hydrauliques sont placés dans un circuit hydraulique qui comporte :

  • une première branche comprenant un premier conduit d'entrée se divisant au niveau d'un point de répartition en un premier conduit de sortie et un deuxième conduit de sortie, et
  • une deuxième branche comprenant un deuxième conduit d'entrée aboutissant à la voie d'entrée du diviseur de débit et se prolongeant au niveau des deux voies de sortie du diviseur de débit d'une part en un troisième conduit de sortie et d'autre part en un conduit menant à la voie d'entrée de l'électrovanne de recalage et se poursuivant au niveau de la première voie de sortie de l'électrovanne de recalage par un quatrième conduit de sortie et au niveau de la deuxième voie de sortie de l'électrovanne de recalage en un conduit de raccordement reliant la deuxième voie de sortie de l'électrovanne de recalage au premier conduit d'entrée.
These hydraulic components are placed in a hydraulic circuit which comprises:
  • a first branch comprising a first input duct dividing at a distribution point into a first output duct and a second output duct, and
  • a second branch comprising a second input duct terminating at the input channel of the flow divider and extending at the two output channels of the flow divider firstly into a third outlet duct and secondly in a conduit leading to the input channel of the reset solenoid valve and continuing at the first output channel of the resetting solenoid valve by a fourth outlet duct and at the second exit channel of the resetting solenoid valve in a connecting duct connecting the second output channel of the resetting solenoid valve to the first inlet duct.

Le bloc hydraulique de l'invention est destiné à être raccordé :

  • au réservoir de fluide hydraulique, via le bloc de commandes hydrauliques des dispositifs hydrauliques de levage, au niveau de son premier conduit d'entrée et de son deuxième conduit d'entrée,
  • à l'un des dispositifs hydrauliques de levage au niveau de son premier conduit de sortie et de son troisième conduit de sortie, et
  • à l'autre dispositif hydraulique de levage au niveau de son deuxième conduit de sortie et de son quatrième conduit de sortie.
The hydraulic block of the invention is intended to be connected:
  • to the hydraulic fluid reservoir, via the hydraulic control unit of the hydraulic lifting devices, at its first inlet duct and its second inlet duct,
  • to one of the hydraulic lifting devices at its first conduit exit and its third exit conduit, and
  • to the other hydraulic lifting device at its second outlet duct and its fourth outlet duct.

Selon l'invention, l'électrovanne de recalage est dans sa première position pendant le fonctionnement normal simultané des deux dispositifs hydrauliques de levage permettant de faire monter ou descendre le plateau ou la plateforme et passe dans sa deuxième position pour procéder au recalage des dispositifs hydrauliques de levage l'un par rapport à l'autre en immobilisant l'un des dispositifs hydrauliques de levage tandis que l'autre poursuit son mouvement, un tel recalage étant possible à tout moment, quels que soient le sens de fonctionnement et la position des dispositifs hydrauliques de levage.According to the invention, the reset solenoid valve is in its first position during the simultaneous normal operation of the two hydraulic lifting devices for raising or lowering the plate or the platform and passes in its second position to proceed with the registration of the hydraulic devices. one of the hydraulic lifting devices while the other continues its movement, such a registration being possible at any time, whatever the direction of operation and the position of the hydraulic lifting devices.

L'invention concerne également un véhicule, notamment porte-voitures, qui comprend au moins un plateau ou une plateforme permettant de transporter une charge et dont la hauteur est modifiable, ce plateau ou plateforme étant supporté par au moins un portique de levage formé de deux bras de levage mécaniquement indépendants, respectivement droite et gauche, chacun de ces bras de levage étant équipé d'un dispositif hydraulique de levage indépendant permettant de faire varier la hauteur du plateau ou plateforme qu'il supporte, véhicule dans lequel chacun des portiques de levage est équipé d'un bloc hydraulique selon l'invention raccordé aux dispositifs hydrauliques de levage du portique concerné.The invention also relates to a vehicle, in particular a car transporter, which comprises at least one platform or platform for carrying a load and the height of which can be modified, this platform or platform being supported by at least one lifting gantry consisting of two mechanically independent lifting arms, respectively right and left, each of these lifting arms being equipped with an independent hydraulic lifting device for varying the height of the platform or platform that it supports, vehicle in which each of the lifting cranes is equipped with a hydraulic block according to the invention connected to the hydraulic lifting devices of the gantry concerned.

D'autres caractéristiques et avantages de l'invention apparaîtront à la lecture de la description détaillée qui va suivre, description faite en référence aux dessins annexés, dans lesquels :

  • la figure 1 est un vue en perspective de l'arrière d'un véhicule porte-voitures équipé d'un bloc hydraulique selon l'invention ;
  • les figures 2 et 3 sont des vues en perspective respectivement de l'avant et de l'arrière d'un bloc hydraulique selon l'invention ;
  • la figure 4 est un schéma hydraulique simplifié d'un bloc hydraulique selon l'invention raccordé à deux vérins hydrauliques simples ;
  • les figures 5 et 6 sont des schémas hydrauliques simplifiés illustrant le fonctionnement du bloc hydraulique de la figure 4, respectivement lors de la sortie et de la rentrée de la tige des vérins hydrauliques ;
  • les figures 7 et 8 sont des schémas hydrauliques simplifiés illustrant le fonctionnement du bloc hydraulique de la figure 4 lorsqu'un recalage est demandé par l'opérateur, ce recalage étant réalisé respectivement par la sortie ou par la rentrée de la tige du vérin gauche ;
  • la figure 9 est un schéma hydraulique d'un mode de réalisation préférentiel du bloc hydraulique selon l'invention, destiné à être raccordé à deux vérins hydrauliques sécurisés ;
  • les figures 10 et 11 sont des schémas hydrauliques illustrant le fonctionnement du bloc hydraulique de la figure 9, respectivement lors de la sortie et de la rentrée de la tige des vérins hydrauliques sécurisés ;
  • les figures 12 et 13 sont des schémas hydrauliques illustrant le fonctionnement du bloc hydraulique de la figure 9 lorsqu'un recalage est demandé par l'opérateur, ce recalage étant réalisé respectivement par la sortie ou par la rentrée de la tige du vérin sécurisé gauche.
Other features and advantages of the invention will appear on reading the detailed description which follows, description made with reference to the accompanying drawings, in which:
  • the figure 1 is a perspective view of the rear of a car transporter equipped with a hydraulic block according to the invention;
  • the Figures 2 and 3 are perspective views respectively of the front and rear of a hydraulic block according to the invention;
  • the figure 4 is a simplified hydraulic diagram of a hydraulic block according to the invention connected to two single hydraulic cylinders;
  • the Figures 5 and 6 are simplified hydraulic diagrams illustrating the operation of the hydraulic block of the figure 4 , respectively during the exit and the retraction of the rod of the hydraulic cylinders;
  • the Figures 7 and 8 are simplified hydraulic diagrams illustrating the operation of the hydraulic block of the figure 4 when a registration is requested by the operator, this registration being performed respectively by the exit or by the re-entry of the rod of the left cylinder;
  • the figure 9 is a hydraulic diagram of a preferred embodiment of the hydraulic block according to the invention, intended to be connected to two secured hydraulic cylinders;
  • the figures 10 and 11 are hydraulic diagrams illustrating the operation of the hydraulic block of the figure 9 , respectively during the exit and the retraction of the rod of the secured hydraulic cylinders;
  • the figures 12 and 13 are hydraulic diagrams illustrating the operation of the hydraulic block of the figure 9 when a registration is requested by the operator, this registration being performed respectively by the output or by the return of the rod of the left secure cylinder.

Le bloc hydraulique selon la présente invention va maintenant être décrit de façon détaillée en référence aux figures 1 à 13. Les éléments équivalents représentés sur les différentes figures porteront les mêmes références numériques.The hydraulic block according to the present invention will now be described in detail with reference to the Figures 1 to 13 . The equivalent elements represented in the different figures will bear the same numerical references.

Sur la figure 1, on a représenté, dans son environnement et en situation d'utilisation, un bloc hydraulique 1 selon l'invention monté à l'amère d'un véhicule 2, notamment porte-voitures selon un exemple préférentiel mais non limitatif d'application de l'invention.On the figure 1 , in its environment and in a situation of use, a hydraulic block 1 according to the invention is shown mounted on the bitter side of a vehicle 2, in particular a car transporter according to a preferred but nonlimiting example of application of the invention. 'invention.

Le bloc hydraulique 1 représenté est monté sur le châssis 3 du véhicule 2, sous le plateau inférieur 4 du véhicule. Il permet d'alimenter et de contrôler deux dispositifs hydrauliques de levage, respectivement gauche 5 et droite 6, qui actionnent les bras de levage gauche et droite d'un portique de levage non représenté.The hydraulic block 1 shown is mounted on the frame 3 of the vehicle 2, under the lower plate 4 of the vehicle. It allows to feed and control two hydraulic lifting devices, respectively left 5 and right 6, which actuate the left and right lifting arms of a hoist gantry not shown.

Selon les applications, les dispositifs hydrauliques de levages 5 et 6 peuvent actionner indifféremment des bras, des poteaux, des montants, des supports ou tout autres éléments d'un ensemble de levage supportant un plateau ou une plateforme de hauteur variable. Pour simplifier, on désignera tous ces éléments, quelle que soit leur nature exacte, par le terme de bras dans la suite de cette description et dans les revendications, sans aucune volonté de limitation.Depending on the application, the lifting hydraulic devices 5 and 6 can operate indifferently arms, posts, uprights, supports or any other elements of a lifting assembly supporting a platform or a platform of variable height. For simplicity, we will designate all these elements, whatever their exact nature, by the term arm in the remainder of this description and in the claims, without any desire to limit.

Les dispositifs hydrauliques de levage 5 et 6 représentés sur cette figure sont des vérins hydrauliques 7 et 8 et plus précisément des vérins hydrauliques sécurisés 9 et 10. Comme on le verra par la suite, l'utilisation du bloc hydraulique 1 selon l'invention n'est pas limitée à ce type de vérins hydrauliques sécurisés 9, 10. Le bloc hydraulique 1 de l'invention peut également être utilisé avec des vérins hydrauliques 7, 8 classiques, ou même avec des dispositifs hydrauliques de levage 5, 6 de nature différente, comme des moteurs à vis par exemple.The hydraulic lifting devices 5 and 6 shown in this figure are hydraulic cylinders 7 and 8 and more precisely secure hydraulic cylinders 9 and 10. As will be seen later, the use of the hydraulic block 1 according to the invention is not limited to this type of secure hydraulic cylinders 9, 10. The hydraulic block 1 of the invention can also be used with conventional hydraulic cylinders 7, 8, or even with hydraulic lifting devices 5, 6 of different nature. like screw motors for example.

Par la course des tiges 11 et 12 des vérins 9 et 10, il est possible de faire varier la hauteur du plateau supérieur du véhicule (non représenté).By the stroke of the rods 11 and 12 of the cylinders 9 and 10, it is possible to vary the height of the upper plate of the vehicle (not shown).

Un bloc hydraulique 1 selon l'invention est de préférence connecté aux dispositifs hydrauliques de levage 5 et 6 de chacun des portiques de levage du véhicule. Afin de minimiser les longueurs de liaisons hydrauliques à utiliser, le bloc hydraulique 1 est préférentiellement situé entre les deux bras de levage du portique concerné, par exemple sensiblement au niveau de l'axe longitudinal du véhicule et ainsi à peu près au milieu des deux bras de levage, ou par exemple, comme représenté, sur l'un des côtés du véhicule, de préférence celui où se trouve le bloc de commandes hydrauliques, manuelles ou électriques, des deux dispositifs hydrauliques de levage 5, 6 concernés.A hydraulic block 1 according to the invention is preferably connected to the hydraulic lifting devices 5 and 6 of each of the lifting cranes of the vehicle. In order to minimize the lengths of hydraulic connections to be used, the hydraulic block 1 is preferably located between the two lifting arms of the gantry concerned, for example substantially at the longitudinal axis of the vehicle and thus approximately in the middle of the two arms. for lifting, or for example, as shown, on one of the sides of the vehicle, preferably the one where the block of hydraulic controls, manual or electrical, the two hydraulic lifting devices 5, 6 concerned.

Le bloc hydraulique 1 est relié par deux liaisons d'alimentation 13 au réservoir de fluide hydraulique, via le bloc de commande hydraulique des dispositifs de levage concernés. Il est également relié par un ensemble de liaisons de distribution 14 aux deux dispositifs hydrauliques de levage 5 et 6.The hydraulic block 1 is connected by two supply links 13 to the hydraulic fluid reservoir, via the hydraulic control unit of the lifting devices concerned. It is also connected by a set of distribution links 14 to the two hydraulic lifting devices 5 and 6.

Dans le cas représenté où les bras de levage sont munis de vérins hydrauliques sécurisés 9 et 10, les liaisons de distribution 14 sont au nombre de trois par vérin et aboutissent au niveau du dispositif de sécurisation 15 ou 16 de chaque vérin 9, 10.In the illustrated case where the lifting arms are provided with secure hydraulic cylinders 9 and 10, the distribution links 14 are three in number by jack and end at the level of the securing device 15 or 16 of each jack 9, 10.

Ces liaisons 13 et 14 peuvent indifféremment être réalisées, entièrement ou en partie, sous la forme de flexibles ou de tubes rigides hydrauliques.These links 13 and 14 may indifferently be made, in whole or in part, in the form of hoses or rigid hydraulic tubes.

Le bloc hydraulique 1 de l'invention est représenté seul sur les figures 2 et 3. Il comprend de préférence un corps 17 compact, qui renferme le circuit hydraulique et les composants hydrauliques du bloc 1.The hydraulic block 1 of the invention is represented alone on the Figures 2 and 3 . It preferably comprises a compact body 17 which encloses the hydraulic circuit and the hydraulic components of the block 1.

Ce corps 17 se présente par exemple sous la forme d'un bloc sensiblement parallélépipédique, dans lequel ont été usinés différents perçages de manière à former des logements pour la réception des composants hydrauliques 18 nécessaires au fonctionnement du bloc hydraulique 1 ainsi que des conduits 19 de passage pour le fluide hydraulique.This body 17 is for example in the form of a substantially parallelepipedal block, in which different holes have been machined so as to form housings for the reception of the hydraulic components 18 necessary for the operation of the hydraulic block 1 and the ducts 19 of FIG. passage for the hydraulic fluid.

L'ensemble de ces conduits 19 forme un circuit hydraulique qui sera détaillé par la suite. Les conduits 19 débouchent à l'extérieur du corps 17 par des orifices 20 dont la taille et la forme sont adaptées pour y introduire l'extrémité d'une liaison 13 ou 14 et réaliser une connexion étanche à ce niveau entre la liaison et le conduit 19 concerné.All of these ducts 19 form a hydraulic circuit which will be detailed later. The ducts 19 open out of the body 17 through holes 20 whose size and shape are adapted to introduce the end of a connection 13 or 14 and make a tight connection at this level between the connection and the conduit 19 concerned.

Afin de faciliter les raccordements hydrauliques et ainsi de simplifier le montage du bloc hydraulique 1, chaque conduit d'entrée et/ou de sortie du circuit hydraulique du bloc 1, ou certains d'entre eux seulement, peut déboucher à l'extérieur du corps 17 par plusieurs orifices 20 équivalents, situés à différents endroits du corps 17 et de préférence sur des faces différentes de celui-ci afin de s'assurer que l'un au moins de ces orifices 20 reste toujours physiquement accessible. Il est ainsi possible de réaliser aisément les connexions hydrauliques quels que soient la position et l'encombrement de la zone de montage du bloc 1, ainsi que l'orientation du bloc en position montée. Les orifices inutilisés sont obturés au moyen de bouchons ou d'un quelconque autre moyen d'obturation étanche.In order to facilitate the hydraulic connections and thus simplify the assembly of the hydraulic block 1, each inlet and / or outlet duct of the hydraulic circuit of the block 1, or only some of them, can lead to the outside of the body 17 by several orifices 20 equivalents, located at different locations of the body 17 and preferably on different faces thereof to ensure that at least one of these orifices 20 remain always physically accessible. It is thus possible to easily make the hydraulic connections regardless of the position and size of the mounting area of the block 1, and the orientation of the block in the mounted position. Unused openings are closed by means of plugs or any other sealing means.

Le bloc hydraulique 1 représenté contient trois composants hydrauliques 18 principaux : une valve d'équilibrage 21, un diviseur de débit 22 et une électrovanne de recalage 23.The hydraulic block 1 shown contains three main hydraulic components 18: a balancing valve 21, a flow divider 22 and a resetting solenoid valve 23.

La valve d'équilibrage 21 n'est pas indispensable dans toutes les applications. Lorsqu'elle est présente, elle a pour fonction de freiner la descente des plateaux, qui représentent une charge motrice en descente, et de maîtriser leur mouvement de descente afin que celui-ci soit progressif et pas trop rapide. La valve d'équilibrage 21 ne s'ouvre que lorsque la pression d'entrée du fluide est suffisante. Il s'établit ainsi au niveau de la valve 21 un équilibrage automatique et progressif entre la pression d'entrée du fluide et le poids de la charge descendante.The balancing valve 21 is not essential in all applications. When it is present, its function is to brake the descent of the trays, which represent a downhill driving load, and to control their descent movement so that it is progressive and not too fast. The balancing valve 21 opens only when the inlet pressure of the fluid is sufficient. It thus establishes at the level of the valve 21 an automatic and progressive balancing between the inlet pressure of the fluid and the weight of the descending load.

La valve d'équilibrage 21 remplit une fonction supplémentaire lorsque les dispositifs hydrauliques de levage 5, 6 sont des vérins sécurisés 9, 10 comportant un dispositif de sécurisation 15, 16 à clapets comme schématisé sur les figures 10 à 13.The balancing valve 21 fulfills an additional function when the hydraulic lifting devices 5, 6 are secured cylinders 9, 10 comprising a securing device 15, 16 with valves as shown schematically on the Figures 10 to 13 .

Dans ce cas, pour garantir le maintien en position des plateaux, la valve d'équilibrage 21 garde le retour fermé tant que les clapets des dispositifs de sécurisation 15, 16 des vérins hydrauliques sécurisés 9, 10 sont fermés assurant ainsi une sécurité supplémentaire. Pour cela, elle requiert pour son ouverture, l'application d'une pression d'ouverture supérieure à celle ouvrant les clapets de sécurité des vérins. Les clapets des dispositifs de sécurisation 15, 16 des vérins s'ouvrent donc avant d'autoriser la descente de la charge par l'ouverture de la valve d'équilibrage 21.In this case, to ensure that the trays are kept in position, the balancing valve 21 keeps the return closed as long as the valves of the securing devices 15, 16 of the secured hydraulic cylinders 9, 10 are closed thus providing additional security. For this, it requires for its opening, the application of an opening pressure greater than that opening the safety valves cylinders. The valves of the securing devices 15, 16 of the cylinders thus open before allowing the descent of the load by the opening of the balancing valve 21.

Le diviseur de débit 22 est un diviseur de débit statique qui a pour fonction d'équilibrer le passage du fluide hydraulique qui le traverse en créant à partir d'un flux d'entrée unique, deux flux de sortie de débit identique. Ce composant fonctionne quel que soit le sens de circulation du fluide. En sens inverse, il régule le débit des flux d'entrée et laisse passer deux flux d'entrée de débit identique pour recomposer un flux unique de sortie. Le diviseur de débit remplit sa fonction d'équilibrage quelle que soit la charge des deux vérins et même dans le cas ou les deux charges ne sont pas identiques.The flow divider 22 is a static flow divider whose function is to balance the passage of the hydraulic fluid passing through it by creating from a single input flow two flow flows of identical flow rate. This component works regardless of the direction of fluid flow. In the opposite direction, it regulates the flow of the input streams and lets two identical flow input streams pass to recompose a single output stream. The flow divider performs its balancing function regardless of the load of the two cylinders and even in the case where the two loads are not identical.

L'électrovanne de recalage 23 est une électrovanne à trois voies et deux positions. Elle est passante tant que l'opérateur ne commande pas le recalage des dispositifs hydrauliques de levage 5, 6 par exemple en appuyant sur un bouton prévu à cet effet. Il s'agit de préférence d'une électrovanne à clapets qui offre une meilleure garantie d'étanchéité qu'une électrovanne à tiroirs.The reset solenoid valve 23 is a three-way and two-position solenoid valve. It is busy as long as the operator does not control the resetting of hydraulic lifting devices 5, 6 for example by pressing a button provided for this purpose. It is preferably a solenoid valve with valves that offers a better sealing guarantee that a solenoid valve with drawers.

Le fonctionnement du bloc hydraulique 1 selon l'invention va maintenant être expliqué de façon détaillée en référence aux schémas hydrauliques des figures 4 à 13.The operation of the hydraulic block 1 according to the invention will now be explained in detail with reference to the hydraulic diagrams of the Figures 4 to 13 .

Sur ces figures, les conventions suivantes ont été adoptées : les conduits dans lesquels il existe un débit de fluide ont été représentés en trait continu, en gras lorsque le fluide est sous pression et en trait fin lorsqu'il n'y a pas de pression. Les conduits dans lesquels il n'existe pas de débit de fluide ont été représentés en traits interrompus, en gras lorsque le fluide est sous pression et en trait fin lorsqu'il n'y a pas de pression.In these figures, the following conventions have been adopted: the ducts in which there is a flow of fluid have been represented in continuous line, in bold when the fluid is under pressure and in thin line when there is no pressure . The ducts in which there is no fluid flow have been shown in phantom, bold when the fluid is under pressure and fine line when there is no pressure.

Sur ces figures, on a placé arbitrairement certains composants hydrauliques 18 et conduits 19 du côté gauche et d'autres du côté droit. Bien entendu cette disposition peut parfaitement être inversée dans d'autres modes de réalisation de l'invention sans incidence sur le fonctionnement du dispositif.In these figures, some hydraulic components 18 and ducts 19 were placed arbitrarily on the left side and others on the right side. Of course this arrangement can be perfectly reversed in other embodiments of the invention without affecting the operation of the device.

On a d'abord représenté sur les figures 4 à 8 une variante de base de l'invention.We first represented on Figures 4 to 8 a basic variant of the invention.

Dans cette variante de base, les entrées et les sorties du bloc hydraulique 1 n'ont pas été doublées et le bloc hydraulique 1 a été spécialement conçu pour coopérer avec des dispositifs hydrauliques 5, 6 ne demandant chacun que deux voies de passage de fluide utilisées alternativement dans les deux sens selon le sens de fonctionnement des dispositifs hydrauliques 5 et 6.In this basic variant, the inlets and outlets of the hydraulic block 1 have not been doubled and the hydraulic block 1 has been specially designed to cooperate with hydraulic devices 5, 6 each requiring only two fluid passageways used. alternately in both directions depending on the direction of operation of the hydraulic devices 5 and 6.

Ces dispositifs hydrauliques 5, 6 sont par exemple des vérins hydrauliques 7 et 8 classiques ne comportant pas de système de sécurisation. Dans ce cas, le maintien de la position des plateaux, une fois le réglage de hauteur effectué et notamment pendant le roulage, n'est pas garanti par un blocage hydraulique au niveau des dispositifs hydrauliques de levage 5 et 6. Ce maintien doit être assuré d'une autre façon, par exemple par la mise en place par l'opérateur de broches latérales au niveau des vérins 7 et 8 ou au niveau des bras de levage, ou par tout autre moyen de blocage mécanique ou autre.These hydraulic devices 5, 6 are for example conventional hydraulic cylinders 7 and 8 having no security system. In this case, the maintenance of the position of the trays, once the height adjustment has been carried out and in particular during the driving, is not guaranteed by a hydraulic lock on the hydraulic lifting devices 5 and 6. This maintenance must be ensured. in another way, for example by the establishment by the operator of lateral pins at the jacks 7 and 8 or at the level of the lifting arms, or by any other means of mechanical locking or other.

Les dispositifs hydrauliques 5, 6 représentés sur les figures 4 à 8 sont des vérins 7, 8 à double effet qui présentent classiquement un corps cylindrique 24, 25 renfermant une grande chambre 26, 27 et une petite chambre 28, 29 séparées par un piston 30, 31 à partir duquel s'étend la tige 11 ou 12 du vérin correspondant.The hydraulic devices 5, 6 shown on the Figures 4 to 8 are double-acting cylinders 7, 8 which conventionally have a cylindrical body 24, 25 enclosing a large chamber 26, 27 and a small chamber 28, 29 separated by a piston 30, 31 from which the rod 11 or 12 extends corresponding cylinder.

Le bloc hydraulique 1 est relié au réservoir de fluide hydraulique, via le bloc de commandes hydrauliques, par deux liaisons d'alimentation 13, l'une amenant le fluide à l'entrée du système et l'autre assurant le retour du fluide vers le réservoir alternativement selon le sens de fonctionnement des vérins 7, 8.The hydraulic block 1 is connected to the hydraulic fluid reservoir, via the hydraulic control block, by two supply links 13, one bringing the fluid to the inlet of the system and the other ensuring the return of the fluid to the tank alternatively according to the direction of operation of the cylinders 7, 8.

On va d'abord décrire le fonctionnement normal du dispositif, correspondant à la sortie ou à la rentrée simultanée des tiges 11 et 12 des deux vérins 7 et 8 sans demande de recalage de la part de l'opérateur.We will first describe the normal operation of the device, corresponding to the output or simultaneous re-entry of the rods 11 and 12 of the two cylinders 7 and 8 without request for registration by the operator.

Lorsque l'opérateur commande la montée du plateau sans demander de recalage, le dispositif se trouve dans la situation représentée sur la figure 5.When the operator controls the rise of the tray without asking for a resetting, the device is in the situation represented on the figure 5 .

Le bloc hydraulique 1 est alimenté en fluide hydraulique à travers son orifice B, le fluide entrant sous pression dans le conduit 32.The hydraulic block 1 is supplied with hydraulic fluid through its orifice B, the fluid coming under pressure in the conduit 32.

Le fluide rencontre un premier conduit 33 dont l'extrémité est fermée au niveau de l'électrovanne de recalage 23 dans cette configuration du dispositif.The fluid meets a first conduit 33 whose end is closed at the resetting solenoid valve 23 in this configuration of the device.

Le fluide progresse donc vers la valve d'équilibrage 21 qui est en position fermée. Il la court-circuite par un conduit de dérivation 34 dans lequel est inséré un clapet 35 qu'il traverse dans le sens passant, ce qui lui permet d'arriver jusqu'à un point de répartition 36 en T au niveau duquel il se sépare en deux flux progressant dans les conduits 37 et 38 afin d'aller alimenter chacun la grande de chambre, respectivement 26 ou 27 de l'un des vérins 7 ou 8.The fluid therefore progresses to the balancing valve 21 which is in the closed position. It bypasses it by a bypass duct 34 in which is inserted a valve 35 which it crosses in the direction, which allows it to reach a distribution point 36 at T where it separates in two flows progressing in the ducts 37 and 38 in order to feed each of the large chambers, respectively 26 or 27 of one of the cylinders 7 or 8.

L'entrée du fluide hydraulique dans les grandes chambres 26, 27 des vérins 7, 8 se traduit par la montée des pistons 30, 31 et ainsi par la sortie des tiges 11, 12 hors du corps cylindrique 24, 25 des vérins 7, 8, ce qui provoque la montée du plateau correspondant.The entry of the hydraulic fluid into the large chambers 26, 27 of the cylinders 7, 8 is reflected by the rise of the pistons 30, 31 and thus by the output of the rods 11, 12 out of the cylindrical body 24, 25 of the cylinders 7, 8 , which causes the rise of the corresponding plateau.

Le fluide hydraulique se trouvant dans la petite chambre 28, 29 des vérins 7, 8 est expulsé hors des vérins par les liaisons 14 et revient dans le bloc hydraulique 1 au niveau des conduits 39 et 40 de celui-ci.The hydraulic fluid in the small chamber 28, 29 of the cylinders 7, 8 is expelled from the cylinders by the links 14 and returns to the hydraulic block 1 at the ducts 39 and 40 thereof.

Le fluide progressant dans le conduit 39 arrive directement sur l'une des voies d'entrée du diviseur de débit 22. Celui progressant dans le conduit 40 rencontre d'abord l'électrovanne de recalage 23. Dans ce mode de fonctionnement, l'opérateur n'ayant pas commandé de recalage, l'électrovanne 23 est passante pour le fluide qui la traverse et se retrouve via le conduit 41 sur l'autre voie d'entrée du diviseur de débit 22.The fluid progressing in the duct 39 arrives directly on one of the input channels of the flow divider 22. The one progressing in the duct 40 first encounters the resetting solenoid valve 23. In this operating mode, the operator having not commanded a recalibration, the solenoid valve 23 passes for the fluid passing through it and is found via the duct 41 on the other input channel of the flow divider 22.

Le diviseur de débit 22 fonctionne ici en recomposition de débit et opère de façon que les deux flux arrivant soient de débit identique sur chacune de ses voies d'entrée quelle que soit la charge des deux vérins. Il assure ainsi la synchronisation du fonctionnement des deux vérins 7 et 8.The flow divider 22 operates here in flow recomposition and operates so that the two incoming flows are of identical flow rate on each of its input channels regardless of the load of the two cylinders. It thus ensures synchronization of the operation of the two jacks 7 and 8.

A partir de ces deux flux d'entrée qu'il réalise de débit identique, le diviseur de débit 22 forme un unique flux de sortie qui s'échappe par le conduit 42 et sort du bloc hydraulique 1 à travers son orifice A pour retourner au réservoir au moyen de l'une des liaisons d'alimentation 13, via le bloc de commandes hydrauliques.From these two input streams that it achieves identical flow rate, the flow divider 22 forms a single output stream that escapes through the conduit 42 and out of the hydraulic block 1 through its port A to return to tank by means of one of the supply links 13, via the hydraulic control block.

Avant de sortir du bloc 1, le fluide hydraulique progresse dans le conduit 42 sur lequel se greffe un conduit 43 de commande de la valve d'équilibrage 21. Cependant, dans cette situation, la pression du fluide n'est pas suffisante pour pousser la valve d'équilibrage 21 en position ouverte.Before exiting the block 1, the hydraulic fluid progresses in the conduit 42 on which is grafted a conduit 43 for controlling the balancing valve 21. However, in this situation, the pressure of the fluid is not sufficient to push the balancing valve 21 in the open position.

Lorsque l'opérateur commande la descente du plateau sans demander de recalage, comme représenté sur la figure 6, le bloc hydraulique 1 est cette fois alimenté à travers son orifice A et le fluide pénètre dans le conduit 42.When the operator controls the descent of the tray without asking for a registration, as shown on the figure 6 , the hydraulic block 1 is this time fed through its orifice A and the fluid enters the conduit 42.

Lorsque le fluide arrive dans le conduit de commande 43, il a cette fois une pression suffisante pour pousser la valve d'équilibrage 21 en position ouverte.When the fluid arrives in the control conduit 43, it has this time a sufficient pressure to push the balancing valve 21 in the open position.

Le fluide hydraulique arrive à l'entrée du diviseur de débit 22 qui le sépare en deux flux de débit identique envoyés dans les conduits 39 et 41.The hydraulic fluid arrives at the inlet of the flow divider 22 which separates it into two identical flow flows sent in the ducts 39 and 41.

Le fluide progressant dans le conduit 39 va directement remplir la petite chambre 28 du vérin gauche 7, tandis que celui progressant dans le conduit 41 traverse d'abord l'électrovanne de recalage 23 en position passante avant d'aller alimenter la petite chambre 29 du vérin droit 8 via le conduit 40.The fluid progressing in the duct 39 will directly fill the small chamber 28 of the left ram 7, while that progressing in the duct 41 passes first through the reset solenoid valve 23 in the pass position before going to feed the small chamber 29 of the right cylinder 8 via duct 40.

L'entrée du fluide hydraulique dans les petites chambres 28, 29 provoque la rentrée des tiges 11 et 12 des vérins et de ce fait la descente du plateau correspondant. Le débit du fluide étant identique dans les conduits 39 et 40 grâce au diviseur de débit 22, les deux vérins fonctionnent de manière synchronisée.The entry of the hydraulic fluid into the small chambers 28, 29 causes the retraction of the rods 11 and 12 of the cylinders and thus the descent of the corresponding plate. Since the flow rate of the fluid is identical in the ducts 39 and 40 thanks to the flow divider 22, the two cylinders operate in a synchronized manner.

Le fluide hydraulique des grandes chambres 26, 27 des vérins 7, 8 est expulsé en direction du bloc hydraulique 1 et dans les conduits 37 et 38 de celui-ci.The hydraulic fluid of the large chambers 26, 27 of the cylinders 7, 8 is expelled towards the hydraulic block 1 and in the ducts 37 and 38 thereof.

Il se recombine en un unique flux au niveau du point de répartition 36 et traverse la valve d'équilibrage 21, qui se trouve cette fois en position passante, pour s'échapper hors du bloc hydraulique 1 à travers l'orifice B via le conduit 32 et retourner au réservoir au moyen de l'une des liaisons d'alimentation 13, via le bloc de commandes hydrauliques.It recombines into a single flow at the distribution point 36 and passes through the balancing valve 21, which is this time in the driving position, to escape from the hydraulic block 1 through the orifice B via the conduit 32 and return to the tank by means of one of the supply links 13, via the hydraulic control block.

Dans cette variante de base du bloc hydraulique selon l'invention, le diviseur de débit peut indifféremment être placé dans le circuit hydraulique du côté des grandes chambres 26, 27 ou du côté des petites chambres 28, 29 des vérins 7 et 8. Sa position pourrait ainsi parfaitement être échangée avec celle du point de répartition 36.In this basic variant of the hydraulic block according to the invention, the flow divider can indifferently be placed in the hydraulic circuit on the side of the large chambers 26, 27 or on the side of the small chambers 28, 29 of the cylinders 7 and 8. Its position could thus be perfectly exchanged with that of the distribution point 36.

Le fonctionnement du diviseur de débit 22 étant par nature imparfait, il arrive qu'un décalage apparaisse se traduisant par un défaut de synchronisation des vérins 7 et 8. Dans ce cas, l'opérateur commande le recalage du dispositif en activant l'électrovanne de recalage 23 par exemple en enfonçant un bouton de commande et en le maintenant enfoncé jusqu'à ce que le recalage soit terminé et les deux vérins de nouveau synchronisés. Cette opération de recalage peut être effectuée quel que soit le sens de fonctionnement des vérins et quelle que soit leur position.The operation of the flow divider 22 is by nature imperfect, it happens that a shift appears resulting in a failure of synchronization of the cylinders 7 and 8. In this case, the operator controls the registration of the device by activating the solenoid valve. resetting 23 for example by depressing a control button and holding it down until the registration is complete and the two cylinders again synchronized. This registration operation can be performed regardless of the direction of operation of the cylinders and whatever their position.

On se trouve alors dans la configuration représentée sur les figures 7 et 8. Le recalage consiste à stopper l'un des vérins en l'isolant, pendant que le second continue à fonctionner, l'opérateur commandant au choix selon la situation la sortie ou la rentrée de sa tige jusqu'à ce que le décalage entre les deux vérins ait été rattrapé.We are then in the configuration represented on the Figures 7 and 8 . The resetting consists in stopping one of the cylinders while isolating it, while the second continues to operate, the operator ordering the situation depending on the situation, the exit or retraction of his rod until the difference between the two jacks has been overtaken.

Dans le mode de réalisation représenté sur les figures 7 et 8, le vérin isolé pendant l'opération de recalage est le vérin droite 8. L'homme du métier pourra sans difficulté imaginer une variante dans laquelle il s'agira du vérin gauche 7, simplement en inversant la position de certains composants hydrauliques du circuit. D'une façon générale, le vérin isolé lors du recalage sera préférentiellement celui situé du côté opposé aux commandes manuelles pour que l'opérateur se trouve du côté du vérin actif afin de mieux voir et contrôler son mouvement.In the embodiment shown on the Figures 7 and 8 , the cylinder isolated during the resetting operation is the right cylinder 8. One skilled in the art can easily imagine a variant in which it will be the left cylinder 7, simply by reversing the position of some hydraulic components of the circuit. In general, the jack isolated during the registration is preferably the one located on the opposite side of the manual controls so that the operator is on the side of the active cylinder to better see and control its movement.

Lorsque l'opérateur commande le recalage, l'électrovanne 23 est alimentée et se place en position de recalage comme représenté sur les figures 7 et 8. Dans cette position, le conduit 33 n'est plus obturé et il est mis en communication avec le conduit 41 à travers l'électrovanne 23.When the operator controls the resetting, the solenoid valve 23 is energized and is placed in the reset position as shown in FIG. Figures 7 and 8 . In this position, the duct 33 is no longer closed and is placed in communication with the duct 41 through the solenoid valve 23.

Au contraire, le conduit 40, qui communique avec la petite chambre 29 du vérin droite 8, se termine au niveau de l'électrovanne 23 par un clapet en position fermé. Le fluide contenu dans la petite chambre 29 ne peut plus s'échapper, rendant ainsi impossible tout déplacement du piston 31 et par là tout mouvement de la tige 12 du vérin 8 qui se retrouve isolé et donc immobilisé.On the contrary, the duct 40, which communicates with the small chamber 29 of the right jack 8, terminates at the level of the solenoid valve 23 by a valve in the closed position. The fluid contained in the small chamber 29 can no longer escape, thus making it impossible to move the piston 31 and thereby any movement of the rod 12 of the cylinder 8 which is isolated and therefore immobilized.

Lorsque, pour procéder au recalage, l'opérateur doit commander la sortie du vérin gauche 7 (ajustement de hauteur vers le haut), le système se trouve dans la configuration représentée sur la figure 7.When, in order to perform the registration, the operator must control the output of the left cylinder 7 (height adjustment upwards), the system is in the configuration shown on the figure 7 .

Comme précédemment le bloc hydraulique est alimenté à travers son orifice B par le conduit 32.As previously the hydraulic block is fed through its orifice B via the conduit 32.

Une partie du fluide passe dans le conduit 33 et traverse l'électrovanne de recalage 23 pour atteindre l'une des deux voies d'entrée du diviseur de débit 22 via le conduit 41.A portion of the fluid passes through the conduit 33 and passes through the reset solenoid valve 23 to reach one of the two input channels of the flow divider 22 via the conduit 41.

Le fluide restant court-circuite la valve d'équilibrage 21 en position fermée, par le conduit de dérivation 34 et arrive jusqu'au point de répartition 36.The remaining fluid bypasses the balancing valve 21 in the closed position by the bypass duct 34 and reaches the distribution point 36.

La course du piston 31 étant bloquée, le fluide ne peut pas alimenter plus la grande chambre 27 du vérin droite 8. Il va donc remplir uniquement la grande de chambre 26 du vérin gauche 7 en passant par le conduit 37.Since the stroke of the piston 31 is blocked, the fluid can not supply more the large chamber 27 of the right jack 8. It will therefore fill only the large chamber 26 of the left jack 7 while passing through the duct 37.

L'entrée du fluide hydraulique dans la grande chambre 26 provoque la sortie de la tige 11 du vérin 7, ainsi que l'expulsion du fluide hydraulique se trouvant dans la petite chambre 28 vers le conduit 39 du bloc hydraulique 1.The entry of the hydraulic fluid into the large chamber 26 causes the output of the rod 11 of the cylinder 7, as well as the expulsion of the hydraulic fluid located in the small chamber 28 towards the duct 39 of the hydraulic block 1.

Le fluide expulsé arrive directement à l'autre voie d'entrée du diviseur de débit 22, qui recompose un flux unique de sortie à partir des deux flux arrivant des conduits 39 et 41. Ce flux de sortie sort par le conduit 42, qui communique avec le conduit 43. Ce fluide de sortie n'a pas la pression suffisante pour pousser la valve d'équilibrage 21 en position ouverte. Il s'échappe hors du bloc hydraulique 1 pour retourner au réservoir via le bloc de commandes hydrauliques.The expelled fluid arrives directly to the other input channel of the flow divider 22, which recomposes a single output stream from the two flows arriving from the ducts 39 and 41. This output stream exits through the duct 42, which communicates with the conduit 43. This output fluid does not have sufficient pressure to push the balancing valve 21 in the open position. It escapes out of the hydraulic block 1 to return to the tank via the hydraulic control block.

Lorsque, pour procéder au recalage, l'opérateur commande la rentrée du vérin gauche 7 (ajustement de hauteur vers le bas), le système se trouve dans la configuration représentée sur la figure 8.When, in order to carry out the registration, the operator controls the retraction of the left jack 7 (height adjustment downwards), the system is in the configuration represented on the figure 8 .

Le fluide hydraulique entre dans le bloc hydraulique 1 par le conduit 42, et vient pousser la valve d'équilibrage 21 en position ouverte via le conduit 43.The hydraulic fluid enters the hydraulic block 1 via the duct 42, and pushes the equilibration valve 21 to the open position via the duct 43.

Il arrive ensuite à l'entrée du diviseur de débit 22 qui le sépare en deux flux de débit identique envoyés dans les conduits 39 et 41.It then arrives at the input of the flow divider 22 which separates it into two identical flow flows sent in the ducts 39 and 41.

Le fluide progressant dans le conduit 41 traverse l'électrovanne de recalage 23 et est renvoyé hors du bloc hydraulique 1 vers le bloc de commandes hydrauliques et le réservoir, via les conduits 33 et 32, tandis que celui progressant dans le conduit 39 va remplir la petite chambre 28 du vérin gauche 7 et ainsi provoquer la rentrée de la tige 11 du vérin.The fluid progressing in the duct 41 passes through the reset solenoid valve 23 and is returned out of the hydraulic block 1 to the hydraulic control block and the reservoir, via the ducts 33 and 32, while the one progressing in the duct 39 will fill the small chamber 28 of the left cylinder 7 and thus cause the retraction of the rod 11 of the cylinder.

Le fluide hydraulique présent dans la grande chambre 26 du vérin 7 est expulsé par le conduit 37 du bloc hydraulique 1. Le vérin droit 8 étant bloqué, le fluide est contraint, au point de répartition 36, d'aller vers la valve d'équilibrage 21 qu'il traverse pour rejoindre le conduit 32 et retourner au réservoir via le bloc de commandes hydrauliques au moyen de la liaison d'alimentation 13.The hydraulic fluid present in the large chamber 26 of the cylinder 7 is expelled through the conduit 37 of the hydraulic block 1. The right cylinder 8 is blocked, the fluid is forced, at the distribution point 36, to go towards the balancing valve 21 it crosses to join the conduit 32 and return to the tank via the hydraulic control block by means of the supply link 13.

Lorsque la tige 11 du vérin gauche 7 a retrouvé une position identique à celle de la tige 12 du vérin droit 8, l'opérateur stoppe le recalage, par exemple en relâchant le bouton de commande. Le fonctionnement des deux vérins peut alors se poursuivre de manière classique et synchronisée, selon l'un des deux modes de fonctionnement normal détaillés précédemment.When the rod 11 of the left cylinder 7 has found a position identical to that of the rod 12 of the right cylinder 8, the operator stops the registration, for example by releasing the control button. The operation of the two cylinders can then continue in a conventional and synchronized manner, according to one of the two normal operating modes detailed above.

Sur les figures 9 à 13 on a représenté un deuxième mode de réalisation du bloc hydraulique 1 de l'invention plus particulièrement conçu pour être raccordé à deux vérins sécurisés 9 et 10. De tels dispositifs hydrauliques 5, 6 nécessitent chacun trois voies de passage de fluide, deux étant utilisées alternativement dans les deux sens selon le sens de fonctionnement des vérins et la troisième servant au fonctionnement du dispositif de sécurisation 15,16.On the Figures 9 to 13 there is shown a second embodiment of the hydraulic block 1 of the invention more particularly designed to be connected to two secured cylinders 9 and 10. Such hydraulic devices 5, 6 each require three fluid passageways, two being used alternately in both directions depending on the direction of operation of the cylinders and the third serving for the operation of the securing device 15, 16.

Ce bloc hydraulique comporte les mêmes composants hydrauliques 18 principaux que la variante de base précédemment décrite, ainsi qu'un circuit hydraulique similaire. Cependant, on peut noter les différences suivantes:

  • Le conduit 33, qui dans la variante de base part d'un point d'intersection 44 avec le conduit 32 pour aboutir à l'électrovanne de recalage 23, se poursuit du côté du point d'intersection 44 par un conduit 45 débouchant à l'extérieur du bloc hydraulique 1 par l'orifice T12, et de l'autre côté par un conduit 46 débouchant par l'orifice T13. En fonctionnement, ces conduits supplémentaires 45 et 46 sont connectés par une liaison de distribution 14, aux dispositifs de sécurisation 15 et 16 respectivement des vérins sécurisés 9 et 10.
This hydraulic block has the same hydraulic components 18 the basic variant described above, as well as a similar hydraulic circuit. However, we can note the following differences:
  • The conduit 33, which in the basic variant starts from a point of intersection 44 with the conduit 32 to lead to the reset solenoid valve 23, continues towards the intersection point 44 by a conduit 45 opening to the outside the hydraulic block 1 through the orifice T12, and the other side through a conduit 46 opening through the orifice T13. In operation, these additional conduits 45 and 46 are connected by a distribution link 14 to the securing devices 15 and 16 respectively of the secured jacks 9 and 10.

Cette disposition des conduits de sortie supplémentaires 45 et 46 correspond à une facilité constructive et de représentation. Cependant, ces conduits de sortie supplémentaires 45, 46 peuvent être reliés, indifféremment l'un de l'autre, à n'importe quel point du conduit de raccordement 33 ou à n'importe quel point du premier conduit d'entrée 32 situé avant la valve d'équilibrage 21 lorsque le premier conduit d'entrée 32 en comporte une.This arrangement of the additional outlet ducts 45 and 46 corresponds to a constructive and representational facility. However, these additional outlet ducts 45, 46 can be connected, indifferently to one another, to any point of the connecting duct 33 or to any point of the first inlet duct 32 located before the balancing valve 21 when the first inlet duct 32 has one.

Alternativement, le bloc hydraulique 1 pourrait ne contenir qu'un seul conduit de sortie supplémentaire relié au conduit de raccordement 33 ou au conduit d'entrée 32, les deux liaisons 14 nécessaires au fonctionnement des dispositifs de sécurisation des vérins sécurisés pouvant, par exemple, être interconnectées à l'extérieur du bloc hydraulique 1.Alternatively, the hydraulic block 1 could contain only one additional outlet duct connected to the connecting duct 33 or to the inlet duct 32, the two connections 14 necessary for the operation of the securing devices of the secured cylinders can, for example, be interconnected outside the hydraulic block 1.

Dans la variante préférentielle représentée sur la figure 9, chacune des sorties du bloc hydraulique 1 est avantageusement doublée par une autre sortie équivalente disposée sur une autre face du bloc.In the preferred embodiment represented on the figure 9 , each of the outputs of the hydraulic block 1 is advantageously doubled by another equivalent output disposed on another face of the block.

Le conduit d'entrée 42 se divise ainsi en deux conduits 47 et 48 débouchant respectivement par les orifices A1 et A2. Le conduit d'entrée 32 se divise également en deux conduits 49 et 50 qui débouchent respectivement par les orifices B1 et B2.The inlet duct 42 thus divides into two ducts 47 and 48 opening respectively through the orifices A1 and A2. The inlet duct 32 is also divided into two ducts 49 and 50 which open respectively through the orifices B1 and B2.

Les conduits de sortie 37, 38, 39 et 40 se divisent chacun en deux conduits, respectivement 51 et 52, 53 et 54, 55 et 56, et 57 et 58, qui débouchent respectivement par les orifices B11 et B12, B13 et B14, A11 et A12, et A13 et A14.The outlet ducts 37, 38, 39 and 40 are each divided into two ducts, respectively 51 and 52, 53 and 54, 55 and 56, and 57 and 58, which open respectively through the orifices B11 and B12, B13 and B14, A11 and A12, and A13 and A14.

De même les conduits de sortie supplémentaires 45 et 33 se divisent chacun en deux conduits, respectivement 59 et 60, et 46 et 61, qui débouchent respectivement par les orifices T11 et T12, et T13 et T14.Similarly, the additional outlet ducts 45 and 33 are each divided into two ducts, respectively 59 and 60, and 46 and 61, which open respectively through the orifices T11 and T12, and T13 and T14.

L'opérateur peut ainsi choisir les orifices qu'il veut utiliser en fonction de ses besoins et de l'accessibilité de la zone de montage du bloc hydraulique 1. Les orifices inutilisés sont obturés, par exemple au moyen de simples bouchons.The operator can thus choose the orifices he wants to use according to his needs and the accessibility of the mounting area of the hydraulic block 1. The unused orifices are closed, for example by means of simple plugs.

On peut également utiliser ce mode de réalisation préférentiel du bloc hydraulique avec des dispositifs hydrauliques 5, 6 simples ne demandant chacun que deux voies de passage de fluide, tels que par exemple des vérins hydrauliques 7 et 8 classiques ne comportant pas de système de sécurisation. Il suffit pour cela de condamner les conduits de sortie supplémentaires qui ne sont pas nécessaires dans une telle application, en obturant simplement les orifices T11, T12, T13 et T14.This preferred embodiment of the hydraulic block can also be used with simple hydraulic devices 5, 6 each requiring only two fluid passage ways, such as, for example, conventional hydraulic cylinders 7 and 8 that do not have a securing system. It suffices to condemn the additional outlet ducts that are not necessary in such an application, simply closing the orifices T11, T12, T13 and T14.

Le fonctionnement ce bloc hydraulique préférentiel est similaire à celui de la variante de base et peut se déduire aisément par l'observation des figures 10 à 13. Sur ces figures, on n'a pas représenté le doublement des sorties détaillé ci-dessus, dans un souci de simplification afin de faciliter la compréhension du lecteur.The operation of this preferential hydraulic block is similar to that of the basic variant and can be easily deduced by the observation of Figures 10 to 13 . In these figures, it is not shown the doubling of the outputs detailed above, for the sake of simplification to facilitate the understanding of the reader.

Les figures 10 et 11 correspondent au fonctionnement normal du système de levage sans demande de recalage de la part de l'opérateur, dans le sens de la sortie simultanée des tiges 11 et 12 des vérins 9 et 10 pour la figure 10 et de leur rentrée simultanée pour la figure 11.The figures 10 and 11 correspond to the normal operation of the lifting system without request for registration by the operator, in the direction of the simultaneous output of the rods 11 and 12 of the cylinders 9 and 10 for the figure 10 and their simultaneous re-entry for the figure 11 .

Dans le cas représenté sur la figure 10, le fonctionnement est identique à celui exposé en référence à la figure 5 si ce n'est que le fluide hydraulique présent dans les conduits de sortie 37 et 38 n'est pas directement envoyé dans les grandes chambres 26 et 27 des vérins 9 et 10, mais passe d'abord par leur dispositif de sécurisation respectivement 15 et 16.In the case shown on the figure 10 , the operation is identical to that explained with reference to the figure 5 except that the hydraulic fluid present in the outlet ducts 37 and 38 is not directly sent into the large chambers 26 and 27 of the cylinders 9 and 10, but passes firstly by their securing device respectively 15 and 16.

Il y rencontre sur son passage deux clapets de sécurisation successifs, référencés respectivement 62 et 63 pour le dispositif de sécurisation gauche 15 et 64 et 65 pour le dispositif de sécurisation droit 16. Dans cette configuration, le fluide circule dans le sens passant des clapets et peut donc les traverser pour aboutir à la grande chambre des vérins et ainsi provoquer la sortie de leurs tiges 11 et 12.There it meets in its path two successive safety valves, referenced respectively 62 and 63 for the left securing device 15 and 64 and 65 for the right securing device 16. In this configuration, the fluid flows in the direction of the valves and can therefore cross to reach the large chamber cylinders and thus cause the output of their rods 11 and 12.

Lorsque l'on cesse d'alimenter le bloc hydraulique 1 en fluide, les dispositifs de sécurisation 15 et 16 garantissent le maintien en position des vérins 9, 10.When one stops supplying the hydraulic block 1 with fluid, the securing devices 15 and 16 guarantee the holding in position of the cylinders 9, 10.

En effet, ils assurent un verrouillage hydraulique des vérins au moyen de leurs deux clapets de sécurisation successifs 62, 63 et 64, 65 qui s'opposent à la sortie du fluide hydraulique hors des grandes chambres des vérins. Les risques de fuite sont évités par la succession en série des deux clapets qui sont en outre préférentiellement de nature différente.Indeed, they provide hydraulic locking of the cylinders by means of their two successive safety valves 62, 63 and 64, 65 which oppose the output of the hydraulic fluid out of the large chambers of the cylinders. The risks of leakage are avoided by the series succession of the two valves which are moreover preferably of different nature.

Les dispositifs de sécurisation 15, 16 des vérins 9, 10 comportent en outre un moyen de pilotage 66, 67 à tiroir dont le piston, respectivement 68 et 69, peut venir mécaniquement ouvrir les clapets de sécurisation 62, 63 et 64, 65 lorsque la pression est suffisante dans le conduit de commande 70, 71.The securing devices 15, 16 of the cylinders 9, 10 further include a control means 66, 67 with a slide, the piston of which, respectively 68 and 69, can mechanically open the safety valves 62, 63 and 64, 65 when the pressure is sufficient in the control conduit 70, 71.

Afin d'établir un équilibre interne permettant un fonctionnement satisfaisant de ces moyens de pilotage 66 et 67, ces derniers sont également connectés, via les conduits 72 et 73 et une liaison de distribution 14, aux conduits de sortie supplémentaires 45 et 46 du bloc hydraulique 1.In order to establish an internal balance allowing a functioning satisfactory of these control means 66 and 67, the latter are also connected, via the ducts 72 and 73 and a distribution link 14, to the additional outlet ducts 45 and 46 of the hydraulic block 1.

Lorsque l'opérateur commande la rentrée des tiges 11 et 12 des vérins 9 et 10 comme illustré sur la figure 11, la pression dans les conduits de commande 70 et 71 des dispositifs de sécurisation devient supérieure à celle des conduits 72 et 73. Elle provoque la sortie du piston 68, 69 des moyens de pilotage 66 et 67 qui vient mécaniquement ouvrir les clapets de sécurisation 62, 63 et 64, 65 des dispositifs de sécurisation 15 et 16 et permet ainsi l'évacuation du fluide hydraulique hors des grandes chambres 26, 27 des vérins.When the operator controls the retraction of the rods 11 and 12 of the cylinders 9 and 10 as illustrated in FIG. figure 11 the pressure in the control ducts 70 and 71 of the securing devices becomes greater than that of the ducts 72 and 73. It causes the piston 68, 69 to leave the control means 66 and 67 which mechanically open the safety valves 62 , 63 and 64, 65 of the securing devices 15 and 16 and thus allows the evacuation of the hydraulic fluid out of the large chambers 26, 27 of the cylinders.

L'opération de recalage, représentée sur les figures 12 et 13, s'effectue comme précédemment par isolement de l'un des vérins 9 ou 10 dont le fonctionnement est stoppé tandis que l'autre vérin poursuit son mouvement.The registration operation, represented on the figures 12 and 13 is performed as previously by isolation of one of the cylinders 9 or 10 whose operation is stopped while the other cylinder continues its movement.

Avec de tels vérins sécurisés 9 et 10, le bloc hydraulique ne comporte de préférence aucun composant hydraulique 18 entre la valve d'équilibrage 21 et le dispositif de sécurisation 15, 16 des vérins sécurisés. En effet, de tels composants hydrauliques pourraient perturber le fonctionnement de ces dispositifs de sécurisation 15, 16. Pour cette raison, le diviseur de débit 22 est de préférence placé sur la branche du circuit non reliée aux dispositifs de sécurisation 15, 16. Sur l'exemple représenté, les dispositifs de sécurisation sont disposés du côté de la grande chambre 26, 27 des vérins, le diviseur de débit 22 est donc placé sur la branche du circuit reliée aux petites chambres 28 et 29 des vérins sécurisés. Bien entendu, la situation peut parfaitement être inversée dans un autre mode de réalisation de l'invention.With such secured cylinders 9 and 10, the hydraulic block preferably comprises no hydraulic component 18 between the balancing valve 21 and the securing device 15, 16 of the secured cylinders. Indeed, such hydraulic components could interfere with the operation of these securing devices 15, 16. For this reason, the flow divider 22 is preferably placed on the branch of the circuit not connected to the securing devices 15, 16. In the example shown, the securing devices are arranged on the side of the large chamber 26, 27 of the cylinders, the flow divider 22 is thus placed on the branch of the circuit connected to the small chambers 28 and 29 of the secured cylinders. Of course, the situation can be perfectly reversed in another embodiment of the invention.

De manière évidente, l'invention ne se limite pas aux modes de réalisation préférentiels décrits précédemment et représentés sur les différentes figures, l'homme du métier pouvant y apporter de nombreuses modifications et imaginer d'autres variantes sans sortir ni de la portée, ni du cadre de l'invention définis par les revendications.Obviously, the invention is not limited to the preferred embodiments described above and shown in the various figures, the skilled person can make many modifications and imagine other variants without departing from the scope and of the scope of the invention defined by the claims.

Il peut ainsi par exemple remplacer la valve d'équilibrage simple représentée par une valve d'équilibrage double, ou la placer sur la branche du circuit reliée aux petites chambres 28 et 29 des vérins (dans le cas de vérins qui travaillent en « tirant ») et ainsi sur le deuxième conduit d'entrée 42 du circuit hydraulique.It can thus for example replace the simple balancing valve represented by a double balancing valve, or place it on the branch of the circuit connected to the small chambers 28 and 29 of the cylinders (in the case of jacks that work by "pulling" ) and so on the second inlet duct 42 of the hydraulic circuit.

On peut également envisager d'utiliser le bloc hydraulique selon l'invention avec des moteurs hydrauliques à vis à la place de vérins hydrauliques, ce qui permettrait d'alimenter ces moteurs hydrauliques en parallèle et non plus en série, et ainsi peut être de diminuer leur puissance. Dans une telle application, la valve d'équilibrage 21 n'est plus nécessaire et peut être supprimée du bloc hydraulique 1.It is also possible to envisage using the hydraulic block according to the invention with hydraulic screw motors instead of hydraulic cylinders, which would make it possible to supply these hydraulic motors in parallel and no longer in series, and thus can be reduced. their power. In such an application, the valve balancing 21 is no longer necessary and can be removed from the hydraulic block 1.

Par ailleurs, on peut imaginer que le passage de l'électrovanne de recalage dans sa deuxième position de recalage ne soit pas commandé par l'opérateur, mais par un dispositif automatique détectant un décalage entre les deux dispositifs hydrauliques de levage 5 et 6.Furthermore, it is conceivable that the passage of the reset solenoid valve in its second reset position is not controlled by the operator, but by an automatic device detecting an offset between the two hydraulic lifting devices 5 and 6.

Claims (14)

  1. A hydraulic unit (1) for installation on a vehicle (2), especially a vehicle for transporting cars, which comprises at least one plate or platform for carrying cargo, the height of which can be modified, said plate or platform being supported by at least one lifting frame formed of two mechanically independent lifting arms, right and left, respectively, each of said lifting arms being equipped with an independent hydraulic lifting device (5, 6) for varying the height of the plate or platform it supports, which hydraulic unit (1) is characterized:
    in that it comprises the following hydraulic components (18):
    • a stream splitter (22) having an inlet track and two outlet tracks and which regulates the flow of fluid to obtain two streams of identical flow rate on the two outlet tracks, regardless of the direction of fluid flow; and
    • a dual position solenoid valve (23) with one inlet track and two outlet tracks which, in its first position, is passable from its inlet track to its first outlet track, with its second outlet track being blocked, and which in its second position, is passable from its inlet track to its second outlet track, with its first outlet track being blocked;
    in that the hydraulic components (18) are placed in a hydraulic circuit which comprises:
    • a first branch comprising a first inlet conduit splitting (32) at a dividing point (36) into a first outlet conduit (37) and a second outlet conduit (38); and
    • a second branch comprising a second inlet conduit (42) ending at the inlet track of the stream splitter (22) and extending to the two outlet tracks of the stream splitter (22) on one side into a third outlet conduit (39) and on the other side into a conduit (41) leading to the inlet track of the solenoid valve (23) and continuing on to the first outlet track of the solenoid valve through a fourth outlet conduit (40) and to the second outlet track of the solenoid valve (23) to a connecting conduit (33) joining the second outlet track of the solenoid valve (23) to the first inlet conduit (32);
    in that it is designed to be connected:
    • to the hydraulic fluid reservoir via the hydraulic control unit for the hydraulic lifting devices (5, 6) at its first inlet conduit (32) and its second inlet conduit (42);
    • to one of the hydraulic lifting devices (5) at its first outlet conduit (37) and its third outlet conduit (39); and
    • to the other hydraulic lifting device (6) at its second outlet conduit (38) and its fourth outlet conduit (40).
    and in that the solenoid valve (23) is in its first position during the normal simultaneous operation of the two hydraulic lifting devices (5, 6) allowing the plate or platform to be raised or lowered and pass into its second position to proceed to reset the hydraulic lifting devices (5, 6) relative to each other by immobilizing one of the hydraulic lifting devices (6) while the other one (5) continues to move, such resetting being possible at any given time regardless of the direction of operation and the position of the hydraulic lifting devices (5, 6).
  2. A hydraulic unit (1) according to the preceding claim characterized in that it further comprises a stabilizing valve (21) placed on one of the inlet conduits (32, 42) of the hydraulic circuit.
  3. A hydraulic unit (1) according to the preceding claim characterized in that the stabilizing valve (21) is a simple or double stabilizing valve.
  4. A hydraulic unit (1) according to any one of the preceding claims characterized in that it further comprises at least one supplementary outlet conduit (45, 46) joined to the connecting conduit (33) or to the first inlet conduit (32) at a point of intersection (44) situated before the stabilizing valve (21) if the first inlet conduit (32) has one.
  5. A hydraulic unit (1) according to any one of the preceding claims characterized in that the solenoid valve (23) is a valve with gates.
  6. A hydraulic unit (1) according to any one of the preceding claims characterized in that passage of the solenoid valve (23) into its second position is controlled by the operator or by an automatic device that detects the relative positions of the two hydraulic lifting devices (5, 6).
  7. A hydraulic unit (1) according to any one of the preceding claims characterized in that it comprises a compact body (17) surrounding the hydraulic circuit and the hydraulic components (18).
  8. A hydraulic unit (1) according to the preceding claim characterized in that its body (17) is a generally parallelepipedal block in which perforations have been drilled forming housings to receive the hydraulic components (18) as well as the conduits (19) for passage of hydraulic fluid.
  9. A hydraulic unit (1) according to claim 7 or 8 characterized in that at least one of the inlet conduits (32, 42) or outlet conduits (37, 38, 39, 40) or even supplemental outlet conduits (45, 46) on the hydraulic circuit opens outside the body (17) through several equivalent orifices (20).
  10. A hydraulic unit (1) according to the preceding claim characterized in that these equivalent orifices (20) are located on different surfaces of the body (17).
  11. A vehicle (2), especially for transporting automobiles, which comprises at least one plate or platform for carrying cargo, the height of which can be modified, said plate or platform being supported by at least one lifting frame formed of two mechanically independent lifting arms, right and left, respectively, each of said lifting arms being equipped with an independent hydraulic lifting device (5, 6) for varying the height of the plate or platform it supports, which hydraulic unit (1) is characterized in that each of its lifting frames is equipped with a hydraulic unit (1) according to one of the preceding claims connected to the hydraulic lifting devices (5, 6) for said frame.
  12. A vehicle (2) according to the preceding claim characterized in that the hydraulic block (1) is installed on the chassis (3) of the vehicle between the two lifting arms for the frame concerned and on the side of the vehicle where the hydraulic control unit for the two hydraulic lifting devices concerned (5, 6) is located.
  13. A vehicle (2) according to claim 11 or 12 characterized in that the hydraulic lifting devices (5, 6) are hydraulic cylinders (7, 8), secure hydraulic cylinders (9, 10) or hydraulic auger motors.
  14. A vehicle (2), especially for transporting automobiles, comprising at least one plate or platform for transporting cargo which is adjustable in height, said plate or platform being supported by at least one lifting frame formed of two mechanically independent lifting arms, right and left, respectively, each of said lifting arms being equipped with a secure hydraulic cylinder (9, 10) for varying the height of the plate or platform it supports, characterized in that this at least one lifting frame is equipped with a hydraulic unit (1) according to claim 4 that comprises two supplementary outlet conduits (45, 46) each connected to the securing device (15, 16) for one of the secure cylinders (9, 10).
EP10737952.1A 2009-07-17 2010-07-13 Supply and resetting hydraulic unit for a lifting assembly with two separate simultaneously actuated powered bearings Not-in-force EP2454489B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0903522A FR2948078B1 (en) 2009-07-17 2009-07-17 HYDRAULIC SUPPLY AND REPLACEMENT BLOCK FOR A LIFTING ASSEMBLY WITH TWO INDEPENDENT MOTORIZED MOUNTS ACTIVATING SIMULTANEOUSLY
PCT/FR2010/000507 WO2011007059A1 (en) 2009-07-17 2010-07-13 Supply and resetting hydraulic unit for a lifting assembly with two separate simultaneously actuated powered bearings

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EP2454489A1 EP2454489A1 (en) 2012-05-23
EP2454489B1 true EP2454489B1 (en) 2013-06-05

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CN (1) CN102483076B (en)
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FR2948078B1 (en) 2011-07-15
IN2012DN01243A (en) 2015-05-15
FR2948078A1 (en) 2011-01-21
ES2424957T3 (en) 2013-10-10
WO2011007059A1 (en) 2011-01-20
CN102483076B (en) 2015-01-07
US8628282B2 (en) 2014-01-14
RU2012100514A (en) 2013-07-20
CN102483076A (en) 2012-05-30
RU2495283C2 (en) 2013-10-10
EP2454489A1 (en) 2012-05-23
US20120141223A1 (en) 2012-06-07

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