EP3142957B1 - Hitch assembly, which is to be fixed on a lifting vehicle and method for actuating said hitch assembly - Google Patents

Description

The invention relates to an attachment device which is to be attached to a lifting vehicle according to the preamble of claim 1 and a method for actuating an attachment device according to the preamble of claim 9.

It is known to provide cylinder drives for the forks of attachments for lifting vehicles, which have the disadvantage that they require a great depth of the structural volume.

The document DE102010038663 discloses an attachment device with a movable fork tine device comprising at least two fork tines, with at least two devices for driving a lateral movement of the fork tine device.

The object is to provide an attachment device which avoids the disadvantages of the prior art and provides a safe and reliable attachment device.

The object is achieved by an attachment device that is to be attached to a lifting vehicle, with a movable fork prong device comprising at least two fork prongs, with at least two devices for driving a lateral movement of the fork prong device, comprising an enlarged field of vision without disruptive elements, each comprising at least one drive chain , in particular set up to run in opposite directions, the drive chain being assigned to a fork prong, each with at least one oil motor by which the device is to be driven, the oil motors of two devices being able to be set up in parallel for a lateral movement of the fork prongs in the same direction / or in opposite directions for a lateral one Directional adjustment of the fork prongs, the oil motors of two devices can be set up in series connection, with one in particular in the lifting vehicle when the oil motors are connected in series arranged valve is provided for limiting the pressure built up in the oil motors, with a hydraulic limit switch for each of the oil motors being provided when the oil motors are connected in parallel, the device having at least one tensioning device, comprising at least one hydraulic piston, which is driven by oil from the oil motor, the fork prong is assigned, is acted upon, by means of which the drive chain is to be kept at a predetermined tension, wherein in particular the device is assigned a deflection roller device on which the drive chain is to be deflected and which is to be tensioned by the hydraulic piston.

The attachment device enables a compact and, for the driver of the lifting vehicle, a particularly clear way of working, since the attachment device has an enlarged field of vision without disruptive elements. In addition, depending on the circuit of the oil motors, a change in the force or torque of the oil motors can be achieved. The attachment device does not move with the adjustment of the fork prongs and it is therefore easy to approach a side container wall, for example.

It is advantageous if, when the oil motors are connected in series, a valve, which is arranged in particular in the lifting vehicle, is provided to limit the pressure built up in the oil motors.

It is advantageous if, when the oil motors are connected in parallel, a hydraulic limit switch is provided for each of the oil motors.

It is advantageous if the oil motors are used in the opposite direction of rotation, since a very compact and space-saving design can be achieved through the reversed arrangement with regard to the direction of rotation of the motor.

It is advantageous if the device has at least one tensioning device, comprising at least one hydraulic piston, which is acted upon by oil from the oil motor to which the fork prong is assigned, by means of which the drive chain is to be kept at a predetermined tension, the device in particular having a pulley device is assigned, on which the drive chain is to be deflected and which is to be tensioned by the hydraulic piston.

It is advantageous if a longitudinal transport device is provided for the longitudinal transport of goods arranged along at least one fork prong, the longitudinal transport device in particular comprising a transport chain, wherein in particular a tensioning device with a hydraulic piston for tensioning the transport chain is provided, actuated by the oil of the oil motor, the longitudinal transport device can be switched on in particular via an electromagnetic valve.

It is advantageous if the fork prong is designed to be extendable as a telescopic fork prong. By adjusting the length of the fork tines, different load depths can be achieved.

It is advantageous if the hydraulic piston is a plunger cylinder, the tension of the device being held by the pressure force of the plunger cylinder and / or the hydraulic piston being a differential cylinder, the tension of the device being held by the tensile force of the differential cylinder.

It is advantageous if the pressure generated in the hydraulic piston is held by a pressure holding device, in particular a check valve.

It is advantageous if a preload valve is provided in front of at least one hydraulic piston, the preload valve in particular being provided in combination with a check valve.

It is advantageous if a pressure limiting valve is provided through which oil can escape from the hydraulic piston, especially in the event of an accident.

The object is also achieved by a method for actuating an attachment device, which is attached to a lifting vehicle, with a movable fork prong device comprising at least two fork prongs, with at least two Devices by which a lateral movement of the fork prong device is driven, namely a drive chain in each case, with one fork prong in particular being moved by the drive chain, each with at least one oil motor by which the device is driven, with the oil motors of two for a lateral, rectified adjustment of the fork prongs Devices are connected in parallel / or for a laterally oppositely directed adjustment of the fork prongs the oil motors of two devices are connected in series, whereby when the oil motors are connected in series, a valve arranged in particular in the lifting vehicle limits the pressure built up in the oil motors and / or when the oil motors are connected in parallel a hydraulic limit switch switches off the oil motors in the end position, the oil motors being used in the opposite direction, comprising an enlarged field of vision without disturbing elements.

It is advantageous if, when the oil motors are connected in series, a valve arranged in particular in the lifting vehicle limits the pressure built up in the oil motors and / or when the oil motors are connected in parallel, a hydraulic limit switch switches the oil motors off in the end position.

It is advantageous if the oil motors are used in opposite directions.

It is advantageous if the drive chain is shortened by an adapted, predetermined length after a predetermined longitudinal expansion, in particular due to use.

Further features and advantages of the invention emerge from the claims and the following description, in which exemplary embodiments of the subject matter of the invention are explained in more detail in conjunction with the drawings.

Fig. 1

eine Anbauvorrichtung mit Antriebsketten in perspektivischer Ansicht,

Fig. 2

eine Anbauvorrichtung mit Antriebsketten in perspektivischer Ansicht,

Fig. 3

eine Anbauvorrichtung mit Antriebsketten in perspektivischer Ansicht und

Fig. 4

eine Anbauvorrichtung mit Antriebskette in Aufsicht.

Show it:

Fig. 1

a mounting device with drive chains in perspective view,

Fig. 2

a mounting device with drive chains in perspective view,

Fig. 3

a mounting device with drive chains in a perspective view and

Fig. 4

a mounting device with drive chain in plan.

Fig. 1 shows a mounting device 1, which is to be attached to a lifting vehicle, with drive chains 6 in a perspective view. The attachment device 1 has, for example, two arrangements of drive chains 6, two in each case arranged next to one another and running in the same direction. Holding devices 9 for a movable fork prong device 2, in particular each comprising at least one fork prong, are arranged on these double-arranged drive chains 6, as in FIG Fig. 4 shown. The drive chains 6 are exemplary devices 4 for driving a lateral movement of the fork device 2, the drive chain 6 in particular each Because a fork prong, represented by its holding device 9, is assigned, each with at least one oil motor 11, by which the device 4 is to be driven, the oil motors 11 of two devices 4 being set up in parallel for a lateral movement of the fork prongs in the same direction and / or for a laterally oppositely directed adjustment of the fork prongs, the oil motors 11 of two devices 4 can be set up in series. The two oil motors 11 are exemplarily used in the opposite direction of rotation with respect to one direction of rotation of the oil motor 11, whereby a very compact design is achieved.

The device 4 has at least one tensioning device 5, comprising at least one hydraulic piston 8, which is acted upon by oil from the oil motor 11, which is assigned to the holding device 9 of the fork prong, by which the drive chain 6 is to be kept at a predetermined tension, in particular the Device 4 is assigned a pulley device 7 on which the drive chain 6 is to be deflected and which is to be tensioned by the hydraulic piston 8.

The attachment device in Fig. 1 has an end, rectified position of the holding devices 9.

Fig. 2 shows a mounting device 1 with drive chains 6 of a device 4 in a perspective view. The attachment device 1 has an opposite end position of the holding devices 9:

Fig. 3 shows a mounting device with drive chains in a perspective view. The attachment device in Fig. 1 assigns one Fig. 1 at an opposite end stop 10 arranged end, rectified position of the holding devices 9.

Fig. 4 shows a mounting device 1 with drive chain 6 in plan view. Fig. 4 shows an attachment device 1 with a fork prong device 2 on holding devices 9 with at least one fork prong 3. A fork prong 3 has, for example, a longitudinal transport device 4, for example in the form of a toothed belt. The transport movement is achieved, for example, by the oil motor 11.

REFERENCE LIST

1

Attachment device

2

Fork device

3

Fork prong

4th

Facility

5

Clamping device

6th

Drive chain

7th

Pulley device

8th

Hydraulic piston

9

Holding device

10

End stop

11th

Oil engine

12th

Longitudinal transport device

Claims (10)

1. Attachment device (1) which is to be attached to a lifting vehicle, with a movable fork-toe device (2) comprising at least two forks (3), with at least two devices (4) to drive a lateral movement of the fork-toe device (2), comprising an enlarged field of vision without disturbing elements, each comprising at least one drive chain (6), in particular arranged for opposite movement, with the drive chain is assigned to a fork (3) respectively each arranged with at least one oil motor (11) by which the device is to be driven, the attachment being arranged in such a way that for a lateral rectified movement of the forks (3) the oil motors (11) of two units (4) can be set up in parallel connection or for a lateral counter-directional adjustment of the forks (3) the oil motors (11) of two units (4) can be set up in in series connection, in the case of series connection of the oil engines (11), a valve is specially arranged in the forklift vehicle to limit the built-up pressure in the oil engines (11), whereas in the case of parallel oil engines (11) a hydraulic limit switch respectively is intended for oil engines (11), the device (4) having at least one tensioning device (5), comprising at least one hydraulic piston (8), powered by oil from the oil engine (11) attached to the fork (3), which keeps the drive chain (6) at the specified tension, in particular the device (4) having a pulley device (7) on which the drive chain (6) is to be deflected and which is to be clamped by the hydraulic piston (8).
2. Attachment device according to claim 1, characterised by the fact that the oil engines (11) are operated in the opposite direction.
3. Attachment device according to one of claims 1 to 2, characterised by the provision of a longitudinal transport device for the longitudinal transport of goods arranged along at least one fork tine (3), the longitudinal transport device comprising in particular a transport chain, in particular a clamping device (5) with a hydraulic piston (8) for clamping the transport chain, operated in particular by the oil of the oil motor (11), whereby the longitudinal transmission device can be switched in particular by means of an electromagnetic valve.
4. Attachment device according to one of claims 1 to 3, characterised by the extension of the fork tine (3) as a telescopic fork.
5. Attachment device according to any of claims 1 to 4, characterised by the hydraulic piston (8) being a plunger cylinder, the tension of the device (4) being maintained by the compressive force of the plunger cylinder and/or the hydraulic piston (8) being a differential cylinder, the tension of the device (4) being maintained by the tensile force of the differential cylinder.
6. Attachment device according to any of claims 1 to 5, characterised by the pressure generated in the hydraulic piston (8) being held by a pressure-retaining device, in particular a non-return valve.
7. Attachment device according to one of claims 1 to 6, characterised by the provision of a pre-tensioning valve in front of at least one hydraulic piston (8), in particular the pre-tensioning valve in combination with a non-return valve.
8. Attachment device according to one of the claims 1 to 7, characterized in that a pressure relief valve is provided, via which oil can escape from the hydraulic piston (8), in particular in the event of an average.
9. Method for actuating an attachment device (1), according to one of the claims 1 to 8, which is to be attached to a lifting vehicle, with a movable fork-toe device (2) comprising at least two forks (3), with at least two devices (4) by which a lateral movement of the fork apparatus (2) is driven, namely each comprising at least one driving chain (6), wherein the said driving chain is in particular driving one fork (3) respectively, wherein for a lateral rectified movement of the forks the oil motors of two devices are arranged in a parallel connection or for a lateral oppositely directed adjustment of the forks the oil motors of two devices are arranged in a series connection,
   whereas in series connection of the oil motors (11) a valve arranged in particular in the lifting vehicle limits the built-up pressure in the oil motors (11) and/or in a parallel connection of the oil motors (11) a hydraulic limit switch respectively switches off the oil motors (11) in the end position, whereas in that the oil motors (11) are arranged in opposite direction comprising an enlarged field of vision without disturbing elements.
10. Method according to claim 9, characterized in that the driving chain (8) after a predetermined longitudinal elongation, especially due to use, is shortened by an adapted predetermined length.

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