EP4357292A1 - Blockiereinheit für teleskopische systeme, hydraulikzylinder und teleskopisches system - Google Patents

Blockiereinheit für teleskopische systeme, hydraulikzylinder und teleskopisches system Download PDF

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Publication number
EP4357292A1
EP4357292A1 EP23204006.3A EP23204006A EP4357292A1 EP 4357292 A1 EP4357292 A1 EP 4357292A1 EP 23204006 A EP23204006 A EP 23204006A EP 4357292 A1 EP4357292 A1 EP 4357292A1
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EP
European Patent Office
Prior art keywords
chamber
hydraulic
movable
further chamber
cylinder
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.)
Pending
Application number
EP23204006.3A
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English (en)
French (fr)
Inventor
Massimo BORTOLI
Luca Miotti
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.)
Oleodinamica Panni SRL
Original Assignee
Oleodinamica Panni SRL
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Oleodinamica Panni SRL filed Critical Oleodinamica Panni SRL
Publication of EP4357292A1 publication Critical patent/EP4357292A1/de
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B66C23/62—Constructional features or details
    • B66C23/64—Jibs
    • B66C23/70—Jibs constructed of sections adapted to be assembled to form jibs or various lengths
    • B66C23/701—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic
    • B66C23/705—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic telescoped by hydraulic jacks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B66C23/62—Constructional features or details
    • B66C23/64—Jibs
    • B66C23/70—Jibs constructed of sections adapted to be assembled to form jibs or various lengths
    • B66C23/701—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic
    • B66C23/708—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic locking devices for telescopic jibs

Definitions

  • the present invention concerns the technical sector relating to telescopic systems and, in particular, it relates to the blocking units of the telescopic sections thereof, to the hydraulic cylinders for moving the telescopic sections and to the telescopic systems, movable or fixed, such as, for example telescopic cranes of movable units or telescopic lifting machines.
  • blocking pins and engaging pins in the movement of telescopic sections is known, and also known as extensions.
  • Blocking pins are used for connecting the telescopic sections to one another while engaging pins are used for connecting the movement means to the telescopic sections for moving the telescopic sections; both the connections are typically of the solidly constrained type, or substantially solidly constrained type.
  • EP0754646B1 and EP2210853B1 which use mechanical pins that work as shear pins for preventing disengagement and which are hydraulically moved in a perpendicular direction to the working direction of the hydraulic cylinder to which they are associated.
  • the present invention intends to obviate one or more drawbacks of the solutions of the prior art.
  • a first aim of the present invention is to facilitate control of the parts which guarantee maximum safety in the blocking unit for telescopic systems.
  • a second aim is to simplify the manufacture of the parts which guarantee maximum safety.
  • Another aim, especially of some embodiments, is to reduce the size of the parts which guarantee maximum safety.
  • An aim of some embodiments is to further reinforce safety in the blocking unit for telescopic systems.
  • the blocking unit comprises a support, a first engaging part for engaging telescopic sections, a first movement part for moving blocking pins of telescopic sections, at least a first hydraulic cylinder, at least a second hydraulic cylinder, a first hydraulic safety cylinder, a second hydraulic safety cylinder and a hydraulic circuit.
  • the first engaging part is movable with respect to the support in a first direction between a disengaged position and an engaged position and vice versa.
  • the at least a first hydraulic cylinder is borne by the support, comprises a first chamber having a variable volume for accommodating hydraulic fluid and moves the first engaging part from the engaged position to the disengaged position with the extension of the first chamber from a respective first volume to a respective second volume.
  • the first movement part is movable with respect to the support in a second direction between a first position and a second position and vice versa.
  • the at least a second hydraulic cylinder is borne by the support, comprises a second chamber having a variable volume for accommodating hydraulic fluid and moves the first movement part from the second position to the first position with the extension of the second chamber from a respective first volume to a respective second volume.
  • the first hydraulic safety cylinder is borne by the support and comprises a first further chamber having a variable volume for accommodating hydraulic fluid and a first movable part which passes from a rest position to an extended position in the extension of the first further chamber from a respective first volume to a respective second volume, with, in the extended position, the first movable part opposing a return of the first engaging part into the disengaged position.
  • the second hydraulic safety cylinder is borne by the support and comprises a second further chamber having a variable volume for accommodating hydraulic fluid and a second movable part which passes from a rest position to an extended position in the extension of the second further chamber from a respective first volume to a respective second volume, with, in the extended position, the second movable part opposing a return of the first movement part into the first position.
  • the hydraulic circuit for pressurised hydraulic fluid comprises a first part which has a first connection and a second part which has a second connection.
  • the first part connects the first connection to the first further chamber, connects the first further chamber to the at least a second chamber and is configured to allow passage of hydraulic fluid towards the at least a second chamber only after the extension of the first further chamber and the second part connects the second connection to the second further chamber, connects the second further chamber to the at least a first chamber and is configured to allow passage of hydraulic fluid towards the at least a first chamber only after the extension of the second further chamber.
  • the first movable part is advantageously movable in the first direction and in the extended position the hydraulic fluid in the first further chamber opposes a return of the first engaging part into the disengaged position.
  • the second movable part is movable in the second direction and in the extended position the hydraulic fluid in the second further chamber opposes a return of the first movement part into the first position.
  • the hydraulic cylinder comprises a cylinder and a rod, movable with respect to one another, a blocking unit according to the present description which is borne by the rod or by the cylinder, a telescopic conduit connected to the hydraulic circuit and valves arranged between the telescopic conduit and the hydraulic circuit.
  • the telescopic system comprises telescopic sections, blocking pins, each movable between a blocked position in which it blocks telescopic sections to one another and an unblocked position (sb) in which it frees telescopic sections from one another and a blocking unit according to the present description.
  • the blocking unit is movable internally of the telescopic sections between a plurality of positions in such a way that the first movement part moves different blocking pins into the blocked position and into the unblocked position and in such a way that the first engaging part can engage different telescopic sections.
  • reference numeral 100 denotes a blocking unit (100) for telescopic systems (1000) having telescopic sections (300) which are blockable to one another by means of blocking pins (400).
  • An embodiment of the blocking unit (100) comprises a support (101), a first engaging part (110) for engaging telescopic sections (300), at least a first hydraulic cylinder (1a, 1b), a first movement part (130) for moving blocking pins (400) of telescopic sections (300), at least a second hydraulic cylinder (2), a first hydraulic safety cylinder (5), a second hydraulic safety cylinder (6) and a hydraulic circuit.
  • the first engaging part (110) is movable with respect to the support (101) in a first direction (A) between a disengaged position (dis) and an engaged position (imp) and vice versa.
  • the at least a first hydraulic cylinder (1a, 1b) is borne by the support (101), comprises a first chamber (11a, 11b) having a variable volume for accommodating hydraulic fluid and moves the first engaging part (110) from the engaged position (imp) to the disengaged position (dis) with the extension of the first chamber (11a, 11b) from a respective first volume to a respective second volume.
  • the first movement part (130) is movable with respect to the support (101) in a second direction (B) between a first position (p) and a second position (s) and vice versa.
  • the at least a second hydraulic cylinder (2) is borne by the support (101), comprises a second chamber (21) having a variable volume for accommodating hydraulic fluid and moves the first movement part (130) from the second position (s) to the first position (p) with the extension of the second chamber (21) from a respective first volume to a respective second volume.
  • the first hydraulic safety cylinder (5) is borne by the support (101) and comprises a first further chamber (52) having a variable volume for accommodating hydraulic fluid and a first movable part (51) which passes from a rest position (rip) to an extended position (est) in the extension of the first further chamber (52) from a respective first volume to a respective second volume. In the extended position (est), the first movable part (51) opposes a return of the first engaging part (110) into the disengaged position (dis).
  • the second hydraulic safety cylinder (6) is borne by the support (101) and comprises a second further chamber (62) having a variable volume for accommodating hydraulic fluid and a second movable part (61) which passes from a rest position (rip) to an extended position (est) in the extension of the second further chamber (62) from a respective first volume to a respective second volume. In the extended position (est), the second movable part (61) opposes a return of the first movement part (130) into the first position (p).
  • the hydraulic circuit for pressurised hydraulic fluid comprises a first part (99a) which has a first connection (99c) and a second part (99b) which has a second connection (99d).
  • the first part (99a) connects the first connection (99c) to the first further chamber (52), connects the first further chamber (52) to the at least a second chamber (21) and is configured to allow passage of hydraulic fluid towards the at least a second chamber (21) only after the extension of the first further chamber (52), i.e. after the first further chamber (52) is extended to a respective second volume.
  • the second part (99b) connects the second connection (99d) to the second further chamber (62), the second further chamber (62) to the at least a first chamber (11a, 11b) and is configured to allow passage of hydraulic fluid towards the at least a first chamber (11a, 11b) only after the extension of the second further chamber (62), i.e. after the second further chamber (62) is extended to a respective second volume.
  • the first movable part (51) is advantageously movable in the first direction (A) and in the extended position (est) the hydraulic fluid in the first further chamber (52) opposes a return of the first engaging part (110) into the disengaged position (dis).
  • the second movable part (61) is movable in the second direction (B) and in the extended position (est) the hydraulic fluid in the second further chamber (62) opposes a return of the first movement part (130) into the first position (p).
  • FIG. 8 shows a more complete embodiment, but the teachings of the present document also regard a blocking unit (100) which comprises a single first movement part (130) and a single first engaging part (110).
  • Figures 8 and 16 though showing a more complete embodiment, make apparent to the expert in the sector the possibility of directly connecting the first further chamber (52) to the at least a second chamber (21) and the second further chamber (62) to at least a first chamber (11a, 11b), i.e. without respectively crossing the third further safety cylinder (7) and the fourth further safety cylinder (8).
  • the blocking unit (100) of the invention has a first engaging part (110) and a first movement part (130) provided with maximum safety.
  • This blocking unit (100) does not use mechanical pins and uses a configuration which enables obtaining a simpler and/or more compact and/or safer device with respect to the use of mechanical pins.
  • a first hydraulic safety cylinder (5) and a second hydraulic safety cylinder (6) it is in general simpler to determine the force transmitted and/or this is connected to the pressure of the hydraulic fluid which also operates on the at least a first hydraulic cylinder (1a, 1b) and on the at least a second hydraulic cylinder (2).
  • the hydraulic actuators enable minimising dimensions given a same force.
  • first part (99a) and the second part (99b) it is preferable for the first part (99a) and the second part (99b) to enable the passage of hydraulic fluid respectively from the first further chamber (52) and the second further chamber (62) only for the position occupied by the first movable part (51) and from the second movable part (61), i.e. without valves or other control devices, as illustrated in the following.
  • This can be obtained by appropriately positioning the connections, or openings, towards the first further chamber (52) and the second further chamber (62) and with non-return valves.
  • Figures 8 and 16 illustrate how the at least a first hydraulic cylinder (1a, 1b) and the at least a second hydraulic cylinder (2) can comprise one single unit, or a plurality of units.
  • each unit comprises a first chamber (11a, 11b) or a second chamber (21)
  • the blocking unit (100) comprises at least a first chamber (11a, 11b) and at least a second chamber (21).
  • the at least a first hydraulic cylinder (1a, 1b) and the at least a second hydraulic cylinder (2), as well as the at least a third hydraulic cylinder (3a, 3b) and the at least a fourth hydraulic cylinder (4) described herein below comprise a respective movable part (12a, 12b, 22, 32a, 32b, 42) and a respective fixed part (13a, 13b, 23, 33a, 33b, 43) movable with respect to one another by the action of the hydraulic fluid in the respective chamber (11a, 11b, 21, 31a, 31b, 41).
  • the respective fixed part (13a, 13b, 23, 33a, 33b, 43) is in general fixed to the support (101) but can be a single body with the support (101).
  • the blocking unit (100) preferably comprises a second engaging part (120) for engaging telescopic sections (300), at least a third hydraulic cylinder (3a, 3b), a second movement part (140) for moving blocking pins (400) of telescopic sections (300), at least a fourth hydraulic cylinder (4), a third hydraulic safety cylinder (7) and a fourth hydraulic safety cylinder (8).
  • the second engaging part (120) is movable with respect to the support (101) in a first direction (A) between a disengaged position (dis) and an engaged position (imp) and vice versa.
  • the at least a third hydraulic cylinder (3a, 3b) is borne by the support (101), comprises a third chamber (31a, 31b) having a variable volume for accommodating hydraulic fluid and moves the second engaging part (120) from the engaged position (imp) to the disengaged position (dis) with the extension of the third chamber (31a, 31b) from a respective first volume to a respective second volume.
  • the second movement part (140) is movable with respect to the support (101) in a second direction (B) between a first position (p) and a second position (s) and vice versa.
  • the at least a fourth hydraulic cylinder (4) is borne by the support (101), comprises a fourth chamber (41) having a variable volume for accommodating hydraulic fluid and moves the second movement part (140) from the second position (s) to the first position (p) with the extension of the fourth chamber (41) from a respective first volume to a respective second volume.
  • the third hydraulic safety cylinder (7) is borne by the support (101) and comprises a third further chamber (72) having a variable volume for accommodating hydraulic fluid and a third movable part (71) which passes from a rest position (rip) to an extended position (est) in the extension of the third further chamber (72) from a respective first volume to a respective second volume. In the extended position (est), the third movable part (71) opposes a return of the second engaging part (120) into the disengaged position (dis).
  • the fourth hydraulic safety cylinder (8) is borne by the support (101) and comprises a third further chamber (82) having a variable volume for accommodating hydraulic fluid and a fourth movable part (81) which passes from a rest position (rip) to an extended position (est) in the extension of the fourth further chamber (82) from a respective first volume to a respective second volume. In the extended position (est), the fourth movable part (81) opposes a return of the second movement part (140) into the first position (p).
  • the first part (99a) connects the first further chamber (52) to the third further chamber (72) and then the third further chamber (72) to the at least a second chamber (21) and to the at least a fourth chamber (41) and is configured to allow passage of hydraulic fluid towards the at least a second chamber (21) and the at least a fourth chamber (41) only after the extension of the first further chamber (52) and of the third further chamber (72), i.e. after the first further chamber (52) and the third further chamber (72) are extended to a respective second volume.
  • the second part (99b) connects the second further chamber (62) to the fourth further chamber (82) and then the fourth further chamber (82) to the at least a first chamber (11a, 11b) and to the at least a third chamber (31a, 31b) and is configured to allow passage of hydraulic fluid towards the at least a first chamber (11a, 11b) and the at least a third chamber (31a, 31b) only after the extension of the second further chamber (62) and of the fourth further chamber (82), i.e. only after the second further chamber (62) and the fourth further chamber (82) are extended to a respective second volume.
  • a blocking unit (100) is obtained with also a second engaging part (120) and a second movement part (140) provided with maximum safety and which guarantees a bilateral behaviour, or symmetrical.
  • the first part (99a) enables the pressurisation of the third hydraulic safety cylinder (7) only following extension of the first hydraulic safety cylinder (5) and enables pressurisation of the at least a second hydraulic cylinder (2) and of the at least a fourth hydraulic cylinder (4) only following extension of the third hydraulic safety cylinder (7).
  • the at least a second hydraulic cylinder (2) and the at least a fourth hydraulic cylinder (4) are preferably connected in parallel to the third hydraulic safety cylinder (7).
  • the second part (99b) enables the pressurisation of the fourth hydraulic safety cylinder (8) only following extension of the second hydraulic safety cylinder (6) and enables pressurisation of the at least a first hydraulic cylinder (1a, 1b) and of the at least a third hydraulic cylinder (3a, 3b) only following extension of the fourth hydraulic safety cylinder (8).
  • the at least a first hydraulic cylinder (1a, 1b) and the at least a third hydraulic cylinder (3a, 3b) are preferably connected in parallel to the fourth hydraulic safety cylinder (8).
  • first engaging part (110) and the second engaging part (120) are moved in opposite directions and generally the first movement part (130) and the second movement part (140) are moved in opposite directions.
  • first part (99a) and the second part (99b) it is preferable for the first part (99a) and the second part (99b) to enable the passage of hydraulic fluid respectively from the third further chamber (72) and the fourth further chamber (82) only for the position occupied by the third movable part (71) and by the fourth movable part (81), i.e. without valves or other control devices.
  • This can be obtained by appropriately positioning the connections, or openings, towards the third further chamber (72) and the fourth further chamber (82) and with non-return valves.
  • the first part (99a) preferably has at least a first connection (53) between the first connection (99c) and the first further chamber (52) and a second connection (54) between the first further chamber (52) and the at least a second chamber (21), with the first connection (53) arranged so as to be always open and with the second connection (54) arranged so as to be open with the first movable part (51) in the extended position (est) and so as to be closed with the first movable part (51) in the rest position (rip).
  • the first part (99a) can possibly comprise a third connection (55) between the first further chamber (52) and the at least a second chamber (21), as illustrated in figure 11 , or the first connection (53) can also be between the first further chamber (52) and the at least a second chamber (21), similarly to what is illustrated for the second part (99b) or for the first part (99a) towards the third further chamber (72).
  • the first part (99a) has a non-return valve between the at least a second chamber (21) and the first connection (53) or the third connection (55) so as to prevent the flow towards the at least a second chamber (21) without crossing the first further chamber (52).
  • first part (99a) and the second part (99b) can comprise first connections (63, 73, 83), second connections (64, 74, 84) and, possibly, third connections towards the respective further chambers (62, 72, 82).
  • the blocking unit (100) preferably comprises a first head (111) which is a single body or is solidly constrained to the first engaging part (110) and the first movable part (51) is connected to the first head (111) or the first movable part (51) is configured so as to contact the first head (111) in the extended position (est) and with the first engaging part (110) in the engaged position (imp).
  • first head (111) facilitates the transmission of the forces to the first engaging part (110) with the possibility of obtaining in any case a compact structure, especially in the case where the first head (111) is a plate as illustrated by way of example in figure 6 . In the same figure it can be observed that the plate has been easily processed to enable the crossing of the first other elastic means (95), described herein below.
  • the at least a first hydraulic cylinder (1a, 1b) comprises two units both comprising a movable part (12a, 12b) which is a body that is distinct from the first head (111) and a fixed part (13a, 13b) which is connected to the support (101) so that the respective movable parts (12a, 12b) contact the first head (111) in areas that are set away from one another.
  • the action on the first head (111) is thus distributed over several points, so as to be able to improve the fluidity of movement and/or to be able to distribute the at least a first hydraulic cylinder (1a, 1b) over more areas, with the consequent advantage of being able to best exploit the spaces available and to limit dimensions.
  • the blocking unit (100) preferably comprises a second head (131) which is a single body or is solidly constrained to the first movement part (130) and the second movable part (61) is connected to the second head (131) or the second movable part (61) is configured so as to contact the second head (131) in the extended position (est) and with the first movement part (130) in the second position (s).
  • a second head (131) facilitates the transmission of the forces to the first movement part (130) with the possibility of obtaining in any case a compact structure, especially in the case where the second head (131) is a plate as illustrated by way of example in figure 6 .
  • the at least a second hydraulic cylinder (2) more preferably comprises two units both comprising a movable part (22) which is a body that is distinct from the second head (131) and a fixed part (23) which is connected to the support (101) so that the respective movable parts (22) contact the second head (131) in areas that are set away from one another.
  • the action on the second head (131) is thus distributed over several points, as it is able to improve the fluidity of movement and/or to distribute the at least a second hydraulic cylinder (2) over several areas, with the consequent advantage of being able to best exploit the spaces available and to limit dimensions.
  • the first movable part (51) is preferably a distinct body from the first head (111) and is configured so as to contact the second head (131) in the extended position (est) and with the first engaging part (110) in the engaged position (imp).
  • first movable part (51) prefferably configured so as to contact the first head (111) as in this way there are no problematic issues in the first further chamber (52) due to the movement of the first head (111) determined by other components.
  • the second movable part (61) is preferably a distinct body from the second head (131) and is configured so as to contact the second head (131) in the extended position (est) and with the first movement part (130) in the second position (s).
  • the second movable part (61) prefferably configured so as to contact the second head (131) as in this way there are no issues in the second further chamber (62) due to the movement of the second head (131) determined by other components.
  • the first head (111) and/or the second head (131) is preferably a plate, so as to obtain a particularly compact structure of the blocking unit (100).
  • At least a hydraulic cylinder between the first hydraulic safety cylinder (5), the second hydraulic safety cylinder (6), the at least a first hydraulic cylinder (1a, 1b) and the at least a second hydraulic cylinder (2), is preferably of a plunger cylinder type.
  • the blocking unit (100) facilitates the use of plunger cylinders which can further simplify the realising of the device and/or reduce the dimensions.
  • first hydraulic safety cylinder (5), the second hydraulic safety cylinder (6), the at least a first hydraulic cylinder (1a, 1b) and the at least a second hydraulic cylinder (2) are directly transposed also for the third hydraulic safety cylinder (7), the fourth hydraulic safety cylinder (8), the at least a third hydraulic cylinder (3a, 3b) and the at least a fourth hydraulic cylinder (4).
  • the blocking unit (100) preferably comprises a third head (121) and/or a fourth head (141) and/or the at least a third hydraulic cylinder (3a, 3b) comprises two units and/or the at least a fourth hydraulic cylinder (4) comprises two units and has the other characteristics detailed in the foregoing.
  • the blocking unit (100) comprises first movement means which move the first engaging part (110) into the engaged position (imp) and, likewise, second movement means which move the first movement part (130) into the second position (s).
  • the first movement means are configured to oppose the extension of the at least a first chamber (11a, 11b) up to a respective first pressure thereof, i.e. at rest or in the absence of pressurisation.
  • the first hydraulic safety cylinder (5) acts exclusively as a further safety in order to maximise the safety of the device.
  • the second movement means are configured to oppose the extension of the at least a second chamber (22) up to a respective first pressure thereof, i.e. at rest or in the absence of pressurisation.
  • the second hydraulic safety cylinder (6) acts exclusively as a further safety in order to maximise the safety of the device.
  • the movement means can comprise a hydraulic cylinder.
  • elastic means are preferably used as movement means which elastic means are, for example, mechanical springs, air springs, nitrogen springs or compressible fluids and tanks. More preferably, mechanical springs are used, which spontaneously ensure safety.
  • the blocking unit (100) preferably comprises first elastic means (91) which oppose the extension of the at least a first chamber (11a, 11b) up to a respective first pressure therein and the force applicable by the first hydraulic safety cylinder (5) and by the first elastic means (91) on the first engaging part (110) is greater than the force applicable by at least a first hydraulic cylinder (1a, 1b).
  • the blocking unit (100) ensures a safety condition in the engaged position (imp).
  • the blocking unit (100) preferably comprises second elastic means (92) which oppose the extension of the at least a second chamber (21) up to a respective first pressure therein and the force applicable by the second hydraulic safety cylinder (6) and by the second elastic means (92) on the first movement part (130) is greater than the force applicable by the at least a second hydraulic cylinder (2). Also in the presence of pressurisation in the at least a second hydraulic cylinder (2), the blocking unit (100) ensures a safety condition in the second position (s).
  • the safety of the blocking unit (100) can be further reinforced with appropriate dimensioning which can possibly exploit, as already mentioned above, the action of a same hydraulic fluid over various devices.
  • the first elastic means (91) and the second elastic means (92) can respectively be incorporated in the at least a first hydraulic cylinder (1a, 1b) or in the at least a second hydraulic cylinder (2), i.e. they can comprise first elastic means (91) or second elastic means (92), or, more preferably can be a separate device, as also illustrated in the appended figures.
  • first elastic means (91) or second elastic means (92) or, more preferably can be a separate device, as also illustrated in the appended figures.
  • flexibility in the positioning thereof increases with a consequent possibility of exploiting spaces to the maximum; further, plunger cylinders can be used.
  • the presence of a first head (111) and a second head (131) facilitates the positioning of the first elastic means (91) or of the second elastic means (92) separated from the hydraulic cylinders.
  • the blocking unit (100) comprises first other elastic means (95) which oppose the first further chamber (52) so as to oppose the extension of the first further chamber (52) up to a respective first pressure thereof, i.e. at rest or in the absence of pressurisation and/or comprises second other elastic means (96) which oppose the second further chamber (62) so as to oppose the extension of the second further chamber (62) up to a respective first pressure thereof, i.e. at rest or in the absence of pressurisation.
  • the first other elastic means (95) and the second other elastic means (96) can be incorporated or not respectively in the first hydraulic safety cylinder (5) and in the second hydraulic safety cylinder (9).
  • the first other elastic means (95) are preferably interposed between the first movable part (51) and the support (101), as illustrated by way of example in figure 6 . In this way the at least a first hydraulic cylinder (1a, 1b) must not overcome even the action of the first other elastic means (95).
  • the second other elastic means (96) are preferably interposed between the second movable part (61) and the support (101), as illustrated by way of example in figure 7 . In this way the at least a second hydraulic cylinder (2) must not overcome even the action of the second other elastic means (96).
  • the blocking unit (100) preferably comprises first other elastic means (95) which oppose the extension of the at least a first further chamber (52) up to a respective first pressure thereof and the force applicable by the first hydraulic safety cylinder (5) and by the first elastic means (91) on the first engaging part (110) is greater than the force applicable by the at least a first hydraulic cylinder (1a, 1b) and/or by the first other elastic means (95).
  • the blocking unit (100) preferably comprises second other elastic means (96) which oppose the extension of the second further chamber (62) up to a respective first pressure thereof and the force applicable by the second hydraulic safety cylinder (6) and by the second elastic means (92) on the first movement part (130) is greater than the force applicable by the at least a second hydraulic cylinder (2) and the second other elastic means (96).
  • the inequalities introduced in the above can easily be satisfied by operating on the thrusting area of the cylinders, typically on the diameters thereof (D1, D2, D3, D4), possibly by taking account of the fact that the first elastic means (91) usually offer a greater contribution than the first other elastic means (96) and that the second elastic means (92) usually offer a greater contribution than the second other elastic means (97).
  • the thrusting area of the first further chamber (52) is preferably equal to or greater than the thrusting area of the at least a first hydraulic cylinder (1a, 1b).
  • the thrusting area of the second further chamber (62) is preferably equal to or greater than the thrusting area of the at least a second hydraulic cylinder (2).
  • the at least a second hydraulic cylinder (2) or the at least a first hydraulic cylinder (1a, 1b) comprises two or more units it is necessary to take account of the overall thrusting area, as shown by way of example in the following.
  • a first diameter (D1) of the first hydraulic safety cylinder (5) of 22 millimetres a second diameter (D2) of the at least a first hydraulic cylinder (11a, 11b) of 14 millimetres and a third diameter (D3) of the second hydraulic safety cylinder (6) and a fourth diameter (D4) of the at least a second hydraulic cylinder (2) of 20 millimetres.
  • the square of 22 is more than double the square of 14.
  • the blocking unit (100) preferably comprises third elastic means (93), fourth elastic means (94), third other elastic means (97) and fourth other elastic means (98) and the other characteristics detailed in the foregoing.
  • the blocking unit (100) typically comprises position sensors for detecting the position of the first engaging part (110) and/or of the second engaging part (120) and/or of the first movement part (130) and/or of the second movement part (140).
  • the position sensors can, for example, be of the inductive type and are schematically illustrated in the appended figures which show second positions (s) or engaged positions (imp) ( locked ) or which show first positions (p) or the disengaged positions (dis) ( unlocked ) .
  • the first chamber (11a, 11b) and/or the second chamber (22) and/or the third chamber (31a, 31b) and/or the fourth chamber (41) are thrust chambers, thus enabling further reduction of the size of the blocking unit (100).
  • the hydraulic fluid is preferably hydraulic oil, for example ISO 46 oil.
  • the first direction (A) and the second direction (B) can differ from one another, for example perpendicular, and the first engaging part (110), the second engaging part (120), the first movement part (130) and the second movement part (140) can operate in different areas from those shown by way of example in the appended figures; by way of example they might have positions, with respect to the support (101), that are in inverse order to those illustrated.
  • the invention also relates to a hydraulic cylinder (200) for telescopic systems (1000).
  • An embodiment of the hydraulic cylinder (200) comprises a cylinder (201) and a rod (202), movable with respect to one another, a blocking unit (100) according to the present description which is borne by the rod (202) or by the cylinder (201), a telescopic conduit (203) connected to the hydraulic circuit and valves (204) arranged between the telescopic conduit (203) and the hydraulic circuit.
  • the blocking unit (100) is preferably borne by the cylinder (201).
  • the valves (204) are preferably electrically-commanded valves, as in the examples of the figures in which the voltage is indicated as follows (24 V DC ).
  • the valves (204) preferably comprise a two-spool directional valve and a blocking directional valve arranged between the first above mentioned valve and the telescopic conduit (203).
  • the two-spool directional valve alternatively connects the blocking directional valve to the first connection (99c) or to the second connection (99d).
  • the invention also relates to a telescopic system (1000).
  • An embodiment of the telescopic system (1000) comprising telescopic sections (300), blocking pins (400), each movable between a blocked position (bl) in which it blocks telescopic sections (300) to one another and an unblocked position (sb) in which it frees telescopic sections (300) from one another and a blocking unit (100) according to the present description.
  • the blocking unit (100) is movable internally of the telescopic sections (300) between a plurality of positions in such a way that the first movement part (130) moves different blocking pins (400) into the blocked position (bl) and into the unblocked position (sb) and in such a way that the first engaging part (110) can engage different telescopic sections (300).
  • the telescopic system (1000) preferably comprises a hydraulic cylinder (200) according to the present description which moves the blocking unit (100) internally of the telescopic sections (300).
  • Figure 21 shows a movable telescopic crane, in appearance similar to those available on the market, in which the teachings of the present document are applied.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Actuator (AREA)
EP23204006.3A 2022-10-21 2023-10-17 Blockiereinheit für teleskopische systeme, hydraulikzylinder und teleskopisches system Pending EP4357292A1 (de)

Applications Claiming Priority (1)

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IT202200021702 2022-10-21

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EP4357292A1 true EP4357292A1 (de) 2024-04-24

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0476225B1 (de) 1990-09-18 1994-07-27 LIEBHERR-WERK EHINGEN GmbH Teleskopiersystem mit verringerter Knicklänge des Teleskopierzylinders
EP0754646A1 (de) * 1995-07-17 1997-01-22 Montanhydraulik GmbH Teleskopiersystem
US5628416A (en) * 1993-12-28 1997-05-13 Liebherr-Werk Ehingen Traveling crane with telescoping boom
DE10056649C1 (de) * 2000-11-09 2002-06-13 Demag Mobile Cranes Gmbh & Co Teleskopausleger mit Verriegelungselement
JP2004323207A (ja) * 2003-04-25 2004-11-18 Tadano Ltd ブーム伸縮機構
US20100187194A1 (en) * 2009-01-27 2010-07-29 Johannes Schuermann Locking System for Telescopic Crane Jib with Movable Locking Unit

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0476225B1 (de) 1990-09-18 1994-07-27 LIEBHERR-WERK EHINGEN GmbH Teleskopiersystem mit verringerter Knicklänge des Teleskopierzylinders
US5628416A (en) * 1993-12-28 1997-05-13 Liebherr-Werk Ehingen Traveling crane with telescoping boom
EP0661234B2 (de) 1993-12-28 2004-03-03 Liebherr-Werk Ehingen GmbH Fahrbarer Kran mit einem Teleskopausleger
EP0754646A1 (de) * 1995-07-17 1997-01-22 Montanhydraulik GmbH Teleskopiersystem
EP0754646B1 (de) 1995-07-17 2000-05-10 Montanhydraulik GmbH Teleskopiersystem
DE10056649C1 (de) * 2000-11-09 2002-06-13 Demag Mobile Cranes Gmbh & Co Teleskopausleger mit Verriegelungselement
JP2004323207A (ja) * 2003-04-25 2004-11-18 Tadano Ltd ブーム伸縮機構
US20100187194A1 (en) * 2009-01-27 2010-07-29 Johannes Schuermann Locking System for Telescopic Crane Jib with Movable Locking Unit
EP2210853B1 (de) 2009-01-27 2016-01-27 Manitowoc Crane Group France SAS Verriegelungssystem für Teleskopkranausleger mit verschiebbarer Verriegelungseinheit

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