EP2653433A1 - Organe d'inclinaison hydraulique d'un châssis de levage d'un chariot de manutention - Google Patents

Organe d'inclinaison hydraulique d'un châssis de levage d'un chariot de manutention Download PDF

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Publication number
EP2653433A1
EP2653433A1 EP13162428.0A EP13162428A EP2653433A1 EP 2653433 A1 EP2653433 A1 EP 2653433A1 EP 13162428 A EP13162428 A EP 13162428A EP 2653433 A1 EP2653433 A1 EP 2653433A1
Authority
EP
European Patent Office
Prior art keywords
pressure
valve
pressure chamber
cylinder
tilt drive
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
Application number
EP13162428.0A
Other languages
German (de)
English (en)
Other versions
EP2653433B1 (fr
Inventor
Stephan Scharf
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.)
STILL GmbH
Original Assignee
STILL GmbH
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 STILL GmbH filed Critical STILL GmbH
Publication of EP2653433A1 publication Critical patent/EP2653433A1/fr
Application granted granted Critical
Publication of EP2653433B1 publication Critical patent/EP2653433B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • B66F9/08—Masts; Guides; Chains
    • B66F9/082—Masts; Guides; Chains inclinable

Definitions

  • the invention relates to a hydraulic tilt drive for tilting a mast of a truck, wherein the tilt drive arranged at least one arranged between the mast and a vehicle body of the truck as a double-acting hydraulic cylinder tilting cylinder, wherein the hydraulic cylinder a first, acting in the direction of an extension movement of the hydraulic cylinder pressure chamber and a second, acting in the direction of a retraction movement of the hydraulic cylinder pressure chamber.
  • a hydraulic tilt drive is used for leaning back and forth of a mast, which is usually formed by one or more tilt cylinders.
  • the tilting cylinder is in this case designed as a double-acting hydraulic cylinder, which is coupled to the vehicle body and the mast to allow tilting movement of the mast relative to the vehicle body.
  • Such tilt cylinders have two pressure chambers, wherein a first pressure chamber upon application of pressure means an extension movement of the hydraulic cylinder, for example, for tilting the mast, and a second pressure chamber upon application of pressure means a retraction movement of the hydraulic cylinder, for example, to tilt back the mast.
  • a control valve For controlling the pressurization of the pressure chambers of the tilting cylinder with pressure medium, a control valve is provided, with which the connection of the corresponding pressure chambers of the tilting cylinder is controlled for the desired tilting movement of the mast with a pump and a container.
  • the acceleration acting on the mast when tilting at the beginning and at the end of a movement depends on the control characteristic with which the control valve is actuated starting from a neutral position into a switching position for forward or backward leaning or starting from the switching position to the forward or reverse position Tilting back to the neutral position is actuated.
  • the varying delivery rate provided by the pump may affect the acceleration applied to the mast when tilted at the beginning and at the end of a travel movement influence.
  • the flow rate can be changed by a change in the rotational speed of a pump and / or in a pump adjustable in the delivery volume by changing the delivery volume of the pump.
  • masts of industrial trucks can during operation of the truck when tilting the mast large accelerations on the mast occur that can be supported on the or the tilt cylinder on the vehicle body of the truck and can affect the stability of the truck, especially at high lifting heights of a lifting device of the truck Mast and a large recorded with the load-carrying load.
  • the present invention has for its object to provide a tilt drive of the type mentioned, with the large acting on the mast accelerations can be avoided when tilting the mast.
  • a damping device which is formed by a pressure chambers interconnecting valve means which establishes a short circuit connection of the two pressure chambers upon reaching a predetermined pressure difference between the two pressure chambers of the tilting cylinder.
  • the two pressure chambers of one or more tilting cylinders are connected to each other by means of a valve device which compares the pressure difference between the two pressure chambers occurring with a maximum, predetermined pressure difference. If this maximum, predetermined pressure difference is exceeded when tilting the mast, the valve device opens and establishes a short-circuit connection between the two pressure chambers.
  • valve device When the short-circuit connection is open, pressure medium can flow from the pressure chamber at the higher pressure to the pressure chamber at the lower pressure, so that a reduction in the pressure difference between the two pressure chambers takes place through a volume compensation between the two pressure chambers of the tilting cylinder.
  • valve device according to the invention With the valve device according to the invention is avoided with open short-circuit connection that large acceleration and thus correspondingly large pulses are transmitted in a tilting movement of the mast to the vehicle body, so that with the valve device according to the invention in a simple and effective way, the stability of the truck can be increased.
  • the valve device comprises a first valve which connects the first pressure chamber with the second pressure chamber in an open position and acts on the pressure in the first pressure chamber against a predetermined pressure difference determining, acting in the direction of a locking spring device in the open position is, and a second valve which connects in an open position, the second pressure chamber with the first pressure chamber and is acted upon by the pressure in the second pressure chamber against a predetermined pressure difference determining, acting in the direction of a locking spring device in the open position.
  • the double-acting tilting cylinder is designed as a differential cylinder with two different large effective pressure surfaces, different forward and backward tilting of the mast in response to the angular position of the mast and the sizes of the pressurized pressure surfaces high pressure differences for moving the mast are required.
  • a valve device formed by two valves can be achieved here in a simple manner that the first valve opens at overpressure in the Vorneigen determining pressure chamber during the Vorneigens of the mast to the pressure-determining the back pressure chamber and correspondingly the second valve at overpressure in which the back determining pressure chamber during the leaning back of the mast to the forward defining pressure chamber opens to achieve the desired short-circuit connection for volume balance between the two pressure chambers of the tilting cylinder.
  • the first valve is acted upon by the pressure in the second pressure chamber in the direction of a blocking position and the second valve is acted upon by the pressure in the first pressure chamber in the direction of a blocking position.
  • the spring means are set at the valves to different predetermined pressure difference, so that the required for a differential cylinder different high maximum pressure differences for the forward and back tilting of the mast can be specified in a simple manner.
  • the valves of the valve device are designed as spring-loaded check valves.
  • Such check valves make it possible in a robust and cost-effective manner to avoid large accelerations when tilting the mast.
  • the valves of the valve device may be formed as a pressure relief valves.
  • Such pressure relief valves also allow a robust and cost-effective way to avoid large accelerations when tilting the mast.
  • valves of the valve device can also be designed as pressure compensators, which also allow a simple and cost-effective manner a short-circuit connection between the pressure chambers of the tilting cylinder to avoid large accelerations when tilting the mast.
  • the valve device according to the invention can be arranged spatially outside of the tilt cylinder or. Such an arrangement of the valve device can be achieved with little effort if a control valve is provided according to an embodiment of the invention for actuating the tilting cylinder, wherein a first pressure medium line is guided from the control valve to the first pressure chamber and a second pressure medium line from the control valve to the second pressure chamber and the Valves are each arranged in a connecting the pressure medium lines short-circuit connection.
  • valve device is integrated into the tilting cylinder (s).
  • Such an integral arrangement of the valve device can be achieved in a simple manner if the tilting cylinder has a piston longitudinally displaceable in a cylinder tube and the valves are installed in the piston.
  • FIG. 1 is an industrial truck 1 with a mast 2 shown in a side view.
  • the truck 1 is designed as a counterbalance forklift.
  • the truck 1 has a vehicle body 3, on which the mast 2 is arranged tiltable about a horizontal tilt axis 4.
  • a load-receiving means 5 for example, one of two forks existing fork, can be handled with the loads, arranged raised and lowered.
  • a hydraulic tilt drive 6 which comprises one or more arranged between the vehicle body 3 and the mast 2 tilting cylinder 7, which are designed as double-acting hydraulic cylinder.
  • the tilt cylinder 7 is - as in connection with the FIGS. 2 to 4 is more apparent - from a cylinder tube 8, in which a connected to a piston rod 9 piston 10 is arranged longitudinally displaceable.
  • the tilting cylinder 7 is in this case coupled in an unspecified manner with the cylinder tube 8 to the vehicle body 3 articulated, wherein the relative to the cylinder tube 8 extendable and retractable piston rod 9 is coupled to the mast 2 articulated.
  • a reverse connection of the tilting cylinder 7 is also possible, in which the piston rod is articulatedly coupled to the vehicle body and the relative to the piston rod extendable and retractable cylinder tube is pivotally connected to the mast.
  • the tilting cylinder 7 is designed as a differential cylinder and has a first, acting in the direction of an extension movement of the hydraulic cylinder 7 pressure chamber 7a and a second, acting in the direction of retraction of the hydraulic cylinder 7 pressure chamber 7a.
  • a piston surface of the piston 10 forms an effective in the pressure chamber 7a piston-side pressure surface 11a of the hydraulic cylinder, and an annular piston surface which is reduced by the surface of the piston rod 9 with respect to the pressure surface 11a, forms an effective in the pressure chamber 7b piston rod side pressure surface 11b of the hydraulic cylinder.
  • a control valve 15 is provided which is connected to a delivery line 16 of a pump 17, one to a container 18 guided container line 19, a guided to the first pressure chamber 7a first pressure medium line 20a and a guided to the second pressure chamber 7b second pressure medium line 20b is connected.
  • the control valve 15 has a neutral position 15a in which the connection of the delivery line 16 and the container line 19 to the pressure medium lines 20a, 20b is shut off, and a position 15b for tilting forward and a position 15c for tilting back the mast on. In the position 15b for tilting forward, the first pressure medium line 20a is connected to the delivery line 16 and the second pressure medium line 20b is connected to the container line 19.
  • the second pressure medium line 20b is connected to the delivery line 16 and the first pressure medium line 20a is connected to the container line 19.
  • the control valve 15 is electrically actuated, including corresponding electrical actuators 21 a, 21 b, for example, magnets are provided for actuating the control valve 15 in the position 15 b and 15 c.
  • a damping device 25 is provided, which is formed by a valve device 26, by means of which the two pressure chambers 7a, 7b are connectable to each other.
  • the valve device 26 compares when tilting between the pressure chambers 7a, 7b pending pressure difference with a predetermined maximum pressure difference and provides this upon reaching and exceeding the predetermined maximum pressure difference between the two pressure chambers 7a, 7b of the tilting cylinder 7 a short-circuit connection of the two pressure chambers 7a , 7b ago.
  • the valve device 26 consists of two valves 26a, 26b, each of which compare in the two pressure chambers 7a, 7b pressure difference with a predetermined maximum pressure difference and produce a short circuit connection between the two pressure chambers 7a, 7b when exceeding the predetermined maximum pressure difference.
  • the valve device 26 comprises a first valve 26a, which connects the first pressure chamber 7a to the second pressure chamber 7b in an open position, and a pressure in the direction of the open position prevailing in the first pressure chamber 7a and a spring device 27a determining a predetermined maximum pressure difference Pressure chamber 7b pending pressure in a blocking position is applied.
  • the valve device 26 further comprises a second valve 26b, which connects the second pressure chamber 7b with the first pressure chamber 7a in an open position and the pressure prevailing in the second pressure chamber 7b in the direction of an open position and a spring device 27b which determines a predetermined maximum pressure difference in the pressure chamber 7a pending pressure is applied in the direction of a blocking position.
  • valves 26a, 26b are arranged outside the tilting cylinder 7.
  • the valve 26a is arranged in a short-circuit connection 28a connecting the first pressure-medium line 20a to the second pressure-medium line 20b and the valve 26b in a short-circuit connection 28b connecting the first pressure-medium line 20a to the second pressure-medium line 20b.
  • the short-circuit connections 28a, 28b are formed by corresponding connecting lines which connect the pressure medium lines 20a, 20b to one another.
  • valves 26a, 26b are integrated in the tilting cylinder 7 and for this purpose installed in the piston 10 of the tilting cylinder 7.
  • the short-circuit connections 28a, 28b are in this case formed by corresponding passages in the piston 10, which connect the pressure chambers 7a, 7b with each other.
  • valves 26a, 26b according to the invention which compare the pressure difference between the two pressure chambers 7a, 7b with the maximum pressure difference predetermined by the spring device 27a, 27b, can be designed according to the FIG. 2 be designed as pressure relief valves.
  • the designed as a pressure relief valve first valve 26a is this purpose by means of the spring means 27a and not shown in detail from the pressure in the pressure chamber 7b in the direction of Acted upon blocking position and acted upon by means of a control pressure line 29a of the pressure in the pressure chamber 7a pending pressure in the direction of a flow position.
  • the pressure relief valve formed as a second valve 26b is acted upon by means of the spring means 27b and not shown in detail by the pressure in the pressure chamber 7a in the direction of a blocking position and acted upon by a control pressure line 29b of the pressure in the pressure chamber 7b pending pressure in the direction of a flow position.
  • valves 26a, 26b are designed as pressure compensators.
  • the trained as a pressure compensator first valve 26a is acted upon by means of the spring means 27a and by means of a control pressure line 30a of the pressure in the pressure chamber 7b in the direction of a blocking position and acted upon by a control pressure line 29a of the pressure in the pressure chamber 7a pending pressure in the direction of a flow position.
  • a pressure compensator second valve 26b is acted upon by means of the spring means 27b and by means of a control pressure line 30b of the pressure in the pressure chamber 7a in the direction of a blocking position and acted upon by a control pressure line 29b of the pressure in the pressure chamber 7b pending pressure in the direction of a flow position.
  • valves 26a, 26b are formed as spring-loaded check valves, the valve closing member 31a, 31b is acted upon by the corresponding spring means 27a, 27b in the blocking position and in the pressure chambers 7a, 7b pending pressures on different sides of the valve closure member 31 a, 31 b queue.
  • the valve device 26 makes it possible that, in the case of the forward tilt V when the control valve 15 acts on the first valve 26a, the pressure difference prevailing in the two pressure chambers 7a, 7b is compared with the maximum pressure difference preset by the spring device 27a and the valve 26a is provided Exceeding the predetermined, maximum pressure difference is acted upon by the pending in the pressure chamber 7a pressure in the open position, so that pressure medium from acting in the direction of the Vorneigens and acted upon by the higher pressure pressure chamber 7a through the open short-circuit connection 28a to the acting in the direction of the back and from the lower pressure applied pressure chamber 7b can flow over.
  • the pressure difference prevailing in the two pressure chambers 7a, 7b is compared with the maximum pressure difference preset by the spring device 27b and the valve 26b is exceeded when the predetermined maximum pressure difference is exceeded is acted upon by the pending in the pressure chamber 7b pressure in the open position, so that pressure means from acting in the direction of the back and acted upon by the higher pressure pressure chamber 7b through the open short-circuit connection 28b to the acting in the direction of the Vorneigens and acted upon by the lower pressure pressure chamber 7a can overflow.
  • the valve device 26 according to the invention thus makes it possible in a robust and cost-effective manner that the tilting movement of the mast 2 can be protected against high accelerations.
  • the valve device 26 according to the invention thus further allows that when tilting the mast 2 high pulses from excessive acceleration of the mast 2 are transmitted to the vehicle body 3, so that in a simple and reliable manner, the stability of the truck 1 can be increased.
  • the valve device 26 operates in such a way that at low lifting height of the load receiving means 5 and a correspondingly heavy load recorded the valves 26a, 26b tend to respond only at high accelerations of the mast 2 and are acted upon in the open position, at high lifting height of the lifting device 5 and a according to heavy recorded load the valves 26a, 26b already at respond to low accelerations of the mast 2 and are acted upon in the open position, so that the stability of the truck can be effectively and easily and without interference with an electronic control of the truck 1 can be increased.

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Structural Engineering (AREA)
  • Civil Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Forklifts And Lifting Vehicles (AREA)
EP20130162428 2012-04-20 2013-04-05 Organe d'inclinaison hydraulique d'un châssis de levage d'un chariot de manutention Not-in-force EP2653433B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE201210103483 DE102012103483A1 (de) 2012-04-20 2012-04-20 Hydraulischer Neigeantrieb eines Hubgerüstes eines Flurförderzeugs

Publications (2)

Publication Number Publication Date
EP2653433A1 true EP2653433A1 (fr) 2013-10-23
EP2653433B1 EP2653433B1 (fr) 2014-12-24

Family

ID=48050501

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Application Number Title Priority Date Filing Date
EP20130162428 Not-in-force EP2653433B1 (fr) 2012-04-20 2013-04-05 Organe d'inclinaison hydraulique d'un châssis de levage d'un chariot de manutention

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Country Link
EP (1) EP2653433B1 (fr)
DE (1) DE102012103483A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1250698A (fr) * 1969-01-21 1971-10-20
JPH0616400A (ja) * 1992-07-06 1994-01-25 Toyota Autom Loom Works Ltd 冷蔵庫用リーチ型フォークリフトの配管防護装置
WO2001060734A1 (fr) * 2000-02-19 2001-08-23 Robert Bosch Gmbh Dispositif servant a reguler la fonction d'inclinaison d'un mat de levage, notamment pour un chariot a fourche
WO2008135039A2 (fr) * 2007-05-08 2008-11-13 UNIVERSITÄT KARLSRUHE (TH) FORSCHUNGSUNIVERSITÄT-GEGRüNDET 1825 Procédé et dispositif pour chariots élévateurs

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1250698A (fr) * 1969-01-21 1971-10-20
JPH0616400A (ja) * 1992-07-06 1994-01-25 Toyota Autom Loom Works Ltd 冷蔵庫用リーチ型フォークリフトの配管防護装置
WO2001060734A1 (fr) * 2000-02-19 2001-08-23 Robert Bosch Gmbh Dispositif servant a reguler la fonction d'inclinaison d'un mat de levage, notamment pour un chariot a fourche
WO2008135039A2 (fr) * 2007-05-08 2008-11-13 UNIVERSITÄT KARLSRUHE (TH) FORSCHUNGSUNIVERSITÄT-GEGRüNDET 1825 Procédé et dispositif pour chariots élévateurs

Also Published As

Publication number Publication date
DE102012103483A1 (de) 2013-10-24
EP2653433B1 (fr) 2014-12-24

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