EP2449267A2 - Valve arrangement - Google Patents
Valve arrangementInfo
- Publication number
- EP2449267A2 EP2449267A2 EP10724324A EP10724324A EP2449267A2 EP 2449267 A2 EP2449267 A2 EP 2449267A2 EP 10724324 A EP10724324 A EP 10724324A EP 10724324 A EP10724324 A EP 10724324A EP 2449267 A2 EP2449267 A2 EP 2449267A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- line
- pressure
- control
- arrangement according
- 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.)
- Granted
Links
- 239000012530 fluid Substances 0.000 claims description 10
- 238000011144 upstream manufacturing Methods 0.000 claims description 7
- 238000010586 diagram Methods 0.000 description 10
- 230000011664 signaling Effects 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
- B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
- B66F9/075—Constructional features or details
- B66F9/20—Means for actuating or controlling masts, platforms, or forks
- B66F9/22—Hydraulic devices or systems
-
- 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
- F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
-
- 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
- F15B2211/305—Directional control characterised by the type of valves
- F15B2211/30525—Directional control valves, e.g. 4/3-directional control valve
- F15B2211/3053—In combination with a pressure compensating valve
- F15B2211/30535—In combination with a pressure compensating valve the pressure compensating valve is arranged between pressure source and directional control valve
-
- 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
- F15B2211/305—Directional control characterised by the type of valves
- F15B2211/3056—Assemblies of multiple valves
- F15B2211/30565—Assemblies of multiple valves having multiple valves for a single output member, e.g. for creating higher valve function by use of multiple valves like two 2/2-valves replacing a 5/3-valve
- F15B2211/30575—Assemblies of multiple valves having multiple valves for a single output member, e.g. for creating higher valve function by use of multiple valves like two 2/2-valves replacing a 5/3-valve in a Wheatstone Bridge arrangement (also half bridges)
-
- 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
- F15B2211/31—Directional control characterised by the positions of the valve element
- F15B2211/3144—Directional control characterised by the positions of the valve element the positions being continuously variable, e.g. as realised by proportional 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
- F15B2211/30—Directional control
- F15B2211/32—Directional control characterised by the type of actuation
- F15B2211/327—Directional control characterised by the type of actuation electrically or electronically
-
- 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
- F15B2211/32—Directional control characterised by the type of actuation
- F15B2211/329—Directional control characterised by the type of actuation actuated by fluid 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
- F15B2211/40—Flow control
- F15B2211/405—Flow control characterised by the type of flow control means or valve
- F15B2211/40507—Flow control characterised by the type of flow control means or valve with constant throttles or orifices
-
- 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
- F15B2211/40553—Flow control characterised by the type of flow control means or valve with pressure compensating valves
- F15B2211/40561—Flow control characterised by the type of flow control means or valve with pressure compensating valves the pressure compensating valve arranged upstream of the flow control means
-
- 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
- F15B2211/415—Flow control characterised by the connections of the flow control means in the circuit
- F15B2211/41509—Flow control characterised by the connections of the flow control means in the circuit being connected to a pressure source and a directional control valve
-
- 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
- F15B2211/50518—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using pressure relief 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
- F15B2211/515—Pressure control characterised by the connections of the pressure control means in the circuit
- F15B2211/5159—Pressure control characterised by the connections of the pressure control means in the circuit being connected to an output member and a return line
-
- 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
- F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
- F15B2211/7107—Multiple output members, e.g. multiple hydraulic motors or cylinders the output members being mechanically linked
-
- 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
- F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
- F15B2211/7114—Multiple output members, e.g. multiple hydraulic motors or cylinders with direct connection between the chambers of different actuators
- F15B2211/7128—Multiple output members, e.g. multiple hydraulic motors or cylinders with direct connection between the chambers of different actuators the chambers being connected in parallel
Definitions
- the invention relates to a valve arrangement of a hoist of an agricultural utility vehicle according to the preamble of patent claim 1.
- the documents DE 101 38 389 A1 and DE 10 2006 004423 A1 each disclose a further valve arrangement for controlling a double-acting lifting cylinder. Cylinder chambers of the lifting cylinder are connected in contrast to the aforementioned prior art via a single way valve with an inlet and outlet line.
- the directional control valve device is designed extremely complex and requires high production costs.
- a valve arrangement for a single-acting lifting cylinder is shown in the catalog "Bosch EHR, Electronic-Hydraulic Hitch Control for Tractors 5/7", edition 1.1 from 1999, on page 17.
- a cylinder space is via the valve arrangement via two directional control valves
- a disadvantage is that a piston guided in the lifting cylinder can be pressurized only from one cylinder space.
- the invention has for its object to provide a valve assembly that is inexpensive and simple, and with a lifting cylinder can be controlled flexibly.
- This object is achieved by a valve arrangement having the features of patent claim 1.
- a valve arrangement for controlling a hoisting gear of an agricultural utility vehicle has at least one lifting cylinder with a first piston separating a second cylinder space, wherein the first cylinder space is connected via a working line to a control arrangement for a single-acting lifting cylinder.
- This has a lifting module for connecting the working line with a supply line and a drain module for connecting the working line to a drain line.
- a pressure line is connected, which is connectable via a valve control with the supply line and the drain line.
- This solution has the advantage that the lifting piston of the lifting cylinder via the first cylinder chamber with a conventional, cost-effective control arrangement for a single-acting lifting cylinder - such a control arrangement is for example in the input explained prior art shown - and controlled via the second cylinder chamber via a simple valve control is.
- the valve control has an inlet and a drain valve, which can be designed as conventional 2-way valves.
- the inlet valve has an electromagnetically actuatable with an actuator in the direction of an opening position and spring-biased in a closed position valve spool.
- the drain valve has a valve spool, which is spring-biased in an open position and is acted upon in the direction of a closed position with a tapped by the pressure line via a control line control pressure.
- the inlet valve instead of an electromagnetic actuator, is manually operated.
- the control line is connected via a discharge channel with the drain line, wherein a throttle is arranged in the discharge channel. A control pressure for switching the drain valve can thus be easily reduced to the drain line down to switch this via a spring in the open position. By the throttle is made possible that the control pressure on the valve spool of the drain valve can be acted upon.
- a spring-biased check valve is arranged in the pressure line between the branching control line and an intermediate line branching to the drain valve, which closes away in the pressure fluid flow direction away from the lifting cylinder.
- a pressure limiting valve between the pressure and the discharge line is arranged.
- the inlet valve is connected, for example via a working channel with the supply line, wherein a throttle is arranged in the working channel.
- a pressure compensator upstream of the throttle is arranged in the working channel.
- a valve spool of the pressure compensator is then acted upon in the direction of opening positions with a spring force of a spring and tapped between the throttle and the inlet valve pressure and in the direction of a closed position with tapped between the pressure balance and the throttle pressure.
- a valve body of the pressure relief valve is acted upon by a spring force of a spring in the closing direction, wherein the spring force is manually or electromagnetically adjustable via an actuator.
- the maximum pressure to be limited in the second cylinder space can be set as desired. This is for example between 10 and 30 bar.
- the control arrangement can be designed as a unit as in the prior art explained in the introduction. Here, this is then formed in an intermediate plate or in a control block, in particular in a load-sensing control block, for controlling a single-acting lifting cylinder.
- the components for controlling the second cylinder chamber of the lifting cylinder can be arranged in an intermediate plate for connection to the control arrangement, or the components are designed as individual components.
- FIG. 1 shows a hydraulic circuit diagram of a valve arrangement according to a first embodiment
- Figure 2 is a hydraulic circuit diagram of the valve assembly according to a second embodiment
- FIG. 3 shows a hydraulic circuit diagram of the valve arrangement according to a third exemplary embodiment
- FIG. 4 shows a hydraulic circuit diagram of the valve arrangement according to a fourth exemplary embodiment
- Figure 5 is a hydraulic circuit diagram of the valve assembly according to a fifth embodiment.
- FIG. 1 shows, in a schematic circuit diagram, a valve arrangement 1 for controlling two lifting cylinders 2, 4 according to a first exemplary embodiment.
- the lifting cylinder Figures 2, 4 are, for example, components of a hoist arrangement of a tractor or mobile implement.
- the two lifting cylinders 2 and 4 each have a reciprocating piston 10 and 12 connected to a piston rod 6 and 8, respectively.
- the pistons 10 and 12 each separate a first cylinder chamber 14 and 16 from a second cylinder chamber or annular space 18 and 20, respectively.
- the cylinder chambers 14, 16 and the annular spaces 18, 20 are each in fluid communication via a connecting line 22 and 24.
- the cylinder chambers 14, 16 of the lifting cylinders 2, 4 can be connected via a control arrangement 26 to a pump or tank line 28, 30.
- the control assembly 26 is formed in an intermediate plate 31 or in a control block, wherein it is the control block is preferably a load-sensing control block.
- the control arrangement 26 is designed to control a single-acting lifting cylinder and is used as an electronic-hydraulic hoist control (EHR) for tractors for years.
- EHR electronic-hydraulic hoist control
- control assembly 26 is for "carrying”, with a hoist 32, in particular a rear lift, of the tractor and, optionally, the implement 34 operated therefrom, either being lifted from a floor 35 or carried in ground contact with a given support force be required for example when plowing or when cultivating.
- the annular spaces 18 and 20 of the lifting cylinders 2 and 4 are also connected via a valve control 36 with the pump or tank line 28, 30 connectable.
- the valve control 36 is formed in an intermediate plate 38.
- the reciprocating pistons 10 and 12 of the lifting cylinders 2 and 4 are moved through the connecting lines 22, 24 substantially simultaneously and are in Figure 1 at the same height.
- the piston rods 6, 8 are connected to a crossbar 40 - which is shown schematically in FIG. 1 - to which a lifting rod 42 for raising and lowering an arm 46 pivotably mounted on a lifting shaft 44 is arranged parallel to the piston rods 6, 8.
- the control arrangement 26 has a continuously adjustable 3/2-way valve 48 designed as a lift module for lifting the attachment 34 and a continuously adjustable 2/2-way valve 50 designed as a sink module. Upstream of the directional control valve 48, an individual pressure balance 52 is arranged.
- a pump connection P with a supply line 56 which is connected to the pump line 28.
- the individual pressure compensator 52 is connected to a connecting line 58, which is connected to a pump port P of the directional control valve 48.
- This also has a tank port T, which is connected to a connected to the tank line 30 drain line 60, and a working port A, via a connecting line 62 with a connected to the connecting line 22 working line 64 and thus with the cylinder chambers 14 and 16 of the lifting cylinder 2 or 4 is connected.
- a spring-biased check valve 66 is arranged, which opens in the flow direction to the cylinder chambers 14, 16.
- a valve spool of the individual pressure compensator 52 is biased by a spring 68 into a throttled opening position a.
- a first control line 70 the valve spool with the pressure between the working port A of the individual pressure compensator 52 and the pump port P of the directional valve 48 in the direction of closing positions b and a second control line 72, the pressure between the working port A of the directional control valve 48 and the check valve 66 picks up, acted upon in the direction of the opening positions a.
- the second control line 72 is additionally connected to a load pressure signaling channel 74, which is connected via a shuttle valve 76 to a load pressure signaling line 78, whereby a load pressure in the cylinder chambers 14 and 16 of the lifting cylinders 2 and 4, if this is a maximum load pressure, via the load pressure signaling line 78 is reported to the variable displacement pump, whereby it is controlled so that in the pump line 28 there is a by a certain pressure difference across the load pressure lying pump pressure, which is not shown in the figure 1.
- the individual pressure compensator 52 With the individual pressure compensator 52, the volume flow via the directional control valve 48 is kept substantially constant regardless of the load.
- a valve spool of the directional control valve 48 is biased by a spring 80 in a basic position x, in which the working port A is connected to the tank port T. Via an electromagnetically actuated actuator 82, the valve spool of the directional control valve 48 is displaceable in the direction of opening positions y, in which the pump port P is connected to the working port A and thus the cylinder chambers 14 and 16 of the lifting cylinders 2 and 4 with the pump line 28 in Pressure fluid connection stand.
- the directional control valve 50 For connecting the cylinder chambers 14 and 16 of the lifting cylinder 2 and 4 with the tank line 30, the directional control valve 50 is provided. This has a connected to the working line 64 working port A and connected to the drain line 60 tank port T. A valve spool of the directional control valve 50 is biased by a spring 84 in a substantially leak-free closing position m and an electromagnetically actuated actuator 86 in the direction of opening positions i , in which the working port A is connected to the tank port T, movable, whereby the cylinder chambers 14, 16 are in fluid communication with the tank line 30.
- a pressure limiting valve 88 arranged between the working line 64 and the discharge line 60 is provided.
- the valve controller 36 has an inlet valve 90 for connecting the annular spaces 18 and 20 of the lifting cylinders 2 and 4 to the pump line 28 and a drain valve 92 for connecting the annular spaces 18 and 20 to the tank line 30.
- the inlet valve is designed as a 2/2-way valve with a pump port P and a working port A.
- the pump port P is via a working channel 93 with the pump line 28 and the working port A via a pressure line 94 with the connecting line 24 and thus with the annular spaces 18, 20 connected.
- a valve spool of the inlet valve 90 is biased by a spring 96 in a locking position g and via an electromagnetically actuated actuator 98 in an open position f brought, in which the pump port P is connected to the working port A.
- the drain valve 92 is like the inlet valve 90 also designed as a 2/2-way valve and has a tank port T, which is connected via a tank channel 100 to the tank line 30 and a working port A, which is connected via an intermediate line 102 to the pressure line 94 in fluid communication ,
- a valve spool of the drain valve 92 is biased by a spring 104 in an open position j and acted upon via a connected to the pressure line 94 control line 106 with the pressure in the pressure line 94 and in a closed position h brought.
- the control line 106 is connected to the tank channel 100 via a relief line 108, in which a throttle 110 is arranged.
- a spring-biased check valve 112 is disposed between the branch point of the control line 106 and the branch point of the intermediate line 102, which opens in the pressure fluid flow direction to the annular spaces 18 and 20.
- a throttle 114 is introduced into the working channel 93.
- a pressure limiting valve 116 is provided, which is arranged between the pressure line 94 and the tank channel 100.
- the pressure relief valve 116 is connected between the branch point of the intermediate line 102 to the drain valve 92 and the connecting line 24 to the pressure line 94.
- the reciprocating pistons 10 and 12 of the lifting cylinders 2 and 4 are pressurized via the cylinder chambers 14 and 16, respectively.
- the directional control valve 50 (lowering module) is energized in the closed position m and the directional control valve 48 (lifting module) energized in an open position y, whereby the cylinder chambers 14 and 16, via the pump line 28, the supply line 56, the individual pressure compensator 52, the directional control valve 48, the check valve 66, the working line 64 and the connecting line 22 are subjected to pump pressure.
- the annular spaces 18 and 20 of the lifting cylinder 2 and 4 via the valve control 36 depressurized.
- the inlet valve 90 is de-energized in the closed position g and the drain valve 92 in the spring-biased opening position j, whereby the annular spaces 18 and 20 via the connecting line 24, the pressure line 94, the intermediate line 102 and the tank channel 100 are connected to the tank line 30.
- the cylinder chambers 14 and 16 of the lifting cylinders 2 and 4 are relieved to the tank line 30, causing the hoist 32 either by its own weight or pressure assisted by pressurization of the reciprocating piston 10 and 12 through the annular spaces 18 and 20 with pump pressure lowers to the floor 35.
- the directional control valve 50 of the control assembly 26 is energized in one of the opening positions i and the directional control valve 48 in the basic position x.
- the cylinder chambers 14 and 16 are then depressurized via the connecting line 22, the working line 64, the directional control valve 50 and the drain line 60 to the tank line 30.
- the lowering speed of the reciprocating pistons 10, 12 is dependent on the opening position i of the directional control valve 50.
- the valve assembly 1 For example, at low temperatures in the use of the valve assembly 1, it may be necessary to allow a rapid lowering of the hoist 32 despite tough pressure medium, that this is pressure-assisted.
- the reciprocating pistons 10 and 12 are acted upon via the annular spaces 18 and 20 with pressure from the pump line 28.
- the cylinder chambers 14 and 16 are depressurized as in lowering self-weight to the tank line 30.
- the inlet valve 90 of the valve controller 36 is energized and thus switched to the open position f, whereby the pressure line 94 is in fluid communication with the pump line 28 and the valve spool of the drain valve 92 via the branching off from the pressure line 94 control line 106 Pump pressure is applied and in the closed position h is connected.
- the annular spaces 18 and 20 are then via the connecting line 24, the pressure line 94, the check valve 112, the inlet valve 90 and the working channel 93 to the pump line 28 in fluid communication.
- the pressure in the annular spaces 18 and 20 is limited in pressure-assisted sinks. If the hoist 32 is acted upon by the attachment 34, for example, due to a bump in the ground 35 counter to the lowering direction with a force, resulting in an increase in pressure in the annular spaces 18 and 20, damage due to excessive pressure by the pressure relief valve 116 is avoided.
- the pressure to be limited of the pressure relief valve 116 is for example between 10 and 25 bar.
- the pressure medium connection between the cylinder chambers 14 and 16 of the lifting cylinder 2 and 4 is blocked to the tank line 30 via the control assembly 26.
- This is done by the unpowered directional valves 50 and 48, wherein the directional control valve 50 is then in the closed position m and the directional control valve 48 in the basic position x and thus the connection to the tank line 30 via the directional control valve 50 and the check valve 66 is locked.
- the pressure limiting valve 88 opens a pressure medium connection to the tank line 30.
- the inlet valve 90 is then de-energized in the spring-biased closed position g, whereby the control line 106 is relieved of pressure via the discharge line 108 to the tank line 30, the check valve 112 closes and the drain valve 92 is connected via the spring 104 in the open position j.
- the trained as a control block or as an intermediate plate control assembly 26 and also designed as an intermediate plate 38 valve control 36 have the same hole pattern (connection hole pattern), which they form a common tank line 30, pump line 28 and load pressure signaling line 78.
- connection hole pattern for example, the load-sensing control block SB 23 of the applicant is provided.
- the disk width of the intermediate plate 38 is preferably 40 mm.
- the actuation of the inlet valve 90 for pressure-assisted lowering takes place via an operator via an EHR control panel or operator-independent by a button that detects a lowering of the hoist 32.
- the valve arrangement 1 can be used, for example, in a front and / or rear lift.
- FIG. 2 discloses a hydraulic circuit diagram of the valve arrangement 1 according to a second exemplary embodiment.
- the components of the valve control 36 are not executed in an intermediate plate 38, but as individual components.
- the tank channel 100 is then connected to a tank connection T and the working channel 93 is connected to a pump connection P of the control arrangement 26.
- FIG. 3 shows in a hydraulic circuit diagram the valve arrangement 1 according to a third exemplary embodiment.
- the valve arrangement 36 is formed in the intermediate plate 38 and additionally has a pressure compensator 120 for keeping a set pressure medium volume flow independent of pressure fluctuations of the pump pressure in the pump line 28.
- the pressure compensator 120 is arranged in the working channel 93 upstream of the throttle 114.
- the throttle 114 serves as a metering orifice, which means that the pressure compensator 120 is an upstream pressure compensator 120.
- This has a valve spool, which is biased by a spring 122 in an open position k and additionally via a control line 124 with a pressure in the working channel 93 downstream of the throttle 114 and via a control line 126 from the pressure upstream of the throttle 114 between this and the pressure level 120 is acted upon in the direction of closing positions I.
- the opening positions k are throttled in the pressure compensator 120.
- the pressure compensator 120 By the pressure compensator 120, the annular spaces 18 and 20 of the lifting cylinders 2 and 4 are supplied with a constant pressure medium volume flow, whereby a constant lowering of the attachment 34 and the hoist 32 is made possible.
- FIG. 4 shows a hydraulic circuit diagram of the valve arrangement 1 according to a fourth exemplary embodiment.
- the pressure limiting valve 116 of the valve control 36 is in contrast to the first embodiment of Figure 1 with an adjustable valve spring 128 configured.
- the pressure limiting valve 116 is, for example, a seat valve with a valve body associated with a valve seat. This is then in the opening direction with the pressure in the pressure line 94 and in
- Closing direction acted upon by a spring force of the valve spring 128 Due to the adjustability of the valve spring 128 of the pressure to be limited in the pressure line 94 and in the annular spaces 18 and 20 of the lifting cylinder 2 and 4 is adjustable. The higher the spring force of the valve spring 128, the higher the pressure to be limited, that is, the pressure that is necessary to open the pressure limiting valve 116.
- the adjustment range of the spring force of the valve spring 128 is preferably selected such that the pressure to be limited is between 10 and 30 bar.
- FIG. 5 shows a hydraulic circuit diagram of the valve arrangement 1 according to a fifth exemplary embodiment.
- a seat-tight pressure relief valve 116 is not necessary. If jacking up of the tractor is to be made possible, various safety requirements are imposed on the valve arrangement 1. For example, upstream of the pressure limiting valve 116, a ball valve is provided in the connecting line 132 which branches off from the pressure line 94 and is connected to the pressure limiting valve 116.
- a valve arrangement for controlling a hoist of an agricultural utility vehicle with at least one lifting cylinder This has two separate from a reciprocating cylinder chambers.
- the first cylinder chamber is connected via a conventional and known for years from the prior art EHR (electronic hydraulic hitch control for tractors) via a first working line.
- EHR electronic hydraulic hitch control for tractors
- a pressurization and pressure relief of the reciprocating piston over the first cylinder chamber is made possible, whereby a hoist is controllable.
- the second cylinder space in particular for pressure-assisted lowering, can be acted upon by a pressure via a valve control 36.
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Transportation (AREA)
- Life Sciences & Earth Sciences (AREA)
- Civil Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Geology (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
- Lifting Devices For Agricultural Implements (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102009031493A DE102009031493A1 (en) | 2009-07-02 | 2009-07-02 | valve assembly |
PCT/EP2010/003573 WO2011000473A2 (en) | 2009-07-02 | 2010-06-15 | Valve arrangement |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2449267A2 true EP2449267A2 (en) | 2012-05-09 |
EP2449267B1 EP2449267B1 (en) | 2016-10-12 |
Family
ID=43299050
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10724324.8A Active EP2449267B1 (en) | 2009-07-02 | 2010-06-15 | Valve arrangement |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP2449267B1 (en) |
CN (1) | CN103038517B (en) |
BR (1) | BRPI1015359A2 (en) |
DE (1) | DE102009031493A1 (en) |
RU (1) | RU2571068C2 (en) |
WO (1) | WO2011000473A2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2020119691A1 (en) * | 2018-12-10 | 2020-06-18 | 铁建重工新疆有限公司 | Drilling jumbo and advancing hydraulic control system therefor |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102010033840A1 (en) * | 2010-08-10 | 2012-02-16 | Alpha Fluid Hydrauliksysteme Müller GmbH | Circuit arrangement for operating mechanically coupled, fluid-actuated displacement units, comprises fluid-operated, dual acting displacement units that are hydraulically directly connected to hydraulic supply port |
CN103644155B (en) * | 2013-12-17 | 2016-01-13 | 上海电气电站设备有限公司 | A kind of hydraulic actuator |
CN104196803B (en) * | 2014-09-11 | 2016-04-27 | 中国农业大学 | A kind of multi-functional screw-in cartridge valve for heavy tractor electricity liquid lifter |
CN104454716A (en) * | 2014-12-07 | 2015-03-25 | 山东双菱内燃机制造有限公司 | Single handle tandem type hydraulic operation system of sloping field hand tractor |
CN105179367A (en) * | 2015-10-13 | 2015-12-23 | 姚运文 | Automatic sequential-action multi-stage hydraulic oil cylinder without sequence valves |
US10624263B2 (en) * | 2016-06-21 | 2020-04-21 | Macdon Industries Ltd | Crop machine with an electronically controlled hydraulic cylinder flotation system |
TR201708846A2 (en) * | 2017-06-15 | 2017-09-21 | Hema Enduestri Anonim Sirketi | A CONTROL VALVE FOR HYDRAULIC LIFTS |
CA3039286A1 (en) | 2018-04-06 | 2019-10-06 | The Raymond Corporation | Systems and methods for efficient hydraulic pump operation in a hydraulic system |
DE102018210471B3 (en) * | 2018-06-27 | 2019-09-05 | Robert Bosch Gmbh | Hoist suspension and hoist |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SU516636A1 (en) * | 1974-08-19 | 1976-06-05 | Предприятие П/Я А-7859 | Hydraulic loader drive system |
DE4313250C2 (en) | 1993-04-23 | 2002-07-11 | Bosch Gmbh Robert | Hydraulic control device |
JPH1120442A (en) * | 1997-07-08 | 1999-01-26 | Toyota Autom Loom Works Ltd | Oscillation controller for industrial vehicle |
CH694763A5 (en) * | 2000-07-03 | 2005-07-15 | Wittur Ag | Control valve unit for a hydraulic elevator. |
DE10138389A1 (en) | 2001-08-04 | 2003-02-20 | Bosch Gmbh Robert | Electro-hydraulic device for controlling a double-acting motor |
DE10206507A1 (en) * | 2002-02-16 | 2003-08-28 | Deere & Co | Device for moving a work unit |
GB2390595B (en) * | 2002-07-12 | 2005-08-24 | Bamford Excavators Ltd | Control system for a machine |
ITBO20020612A1 (en) * | 2002-09-27 | 2004-03-28 | Cnh Italia Spa | ATTACHMENT DEVICE FOR AGRICULTURAL TOOLS TO A TRACTOR. |
DE102006004423B4 (en) | 2006-01-31 | 2018-08-02 | Robert Bosch Gmbh | Valve arrangement for controlling a hoist or attachment and method for controlling this |
-
2009
- 2009-07-02 DE DE102009031493A patent/DE102009031493A1/en not_active Withdrawn
-
2010
- 2010-06-15 CN CN201080029731.9A patent/CN103038517B/en not_active Expired - Fee Related
- 2010-06-15 BR BRPI1015359A patent/BRPI1015359A2/en not_active Application Discontinuation
- 2010-06-15 EP EP10724324.8A patent/EP2449267B1/en active Active
- 2010-06-15 WO PCT/EP2010/003573 patent/WO2011000473A2/en active Application Filing
- 2010-06-15 RU RU2012103383/06A patent/RU2571068C2/en not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
See references of WO2011000473A2 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2020119691A1 (en) * | 2018-12-10 | 2020-06-18 | 铁建重工新疆有限公司 | Drilling jumbo and advancing hydraulic control system therefor |
Also Published As
Publication number | Publication date |
---|---|
RU2571068C2 (en) | 2015-12-20 |
BRPI1015359A2 (en) | 2016-05-10 |
EP2449267B1 (en) | 2016-10-12 |
RU2012103383A (en) | 2014-07-10 |
WO2011000473A3 (en) | 2012-04-26 |
DE102009031493A1 (en) | 2011-01-05 |
CN103038517B (en) | 2016-07-06 |
CN103038517A (en) | 2013-04-10 |
WO2011000473A2 (en) | 2011-01-06 |
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