EP2392540B1 - Industrial truck - Google Patents

Description

The invention relates to an industrial truck, in particular counterbalance forklift truck, comprising a vehicle body and a power supply unit arranged inside the vehicle body, in particular a battery pack, wherein the vehicle body is provided with a lateral opening and the power supply unit through the lateral opening in the horizontal direction relative to the battery compartment is movable, wherein the power supply unit stands up on a slide carriage, which is arranged in the battery compartment in the transverse direction displaceable and movable between an operating position and a change position, and wherein the truck comprises a pendulum-suspended steering axle.

Industrial trucks with an electric drive system, in particular counterbalanced forklift trucks, have recently been designed with a lateral removal opening for a lateral change of the power supply unit in the horizontal direction. In this case, a battery block, a fuel cell unit or a hybrid drive unit can be provided as the energy supply unit. In order to change the energy supply unit formed, for example, by a battery pack, the energy supply unit present in the truck is moved partially or completely out of the battery compartment of the truck in the horizontal and lateral direction. The power supply unit can then be raised in this change position, for example, with a hall crane and transported on. For this purpose, it is already known to arrange the power supply unit on a movable in the transverse direction of the truck thrust carriage, the thrust carriage by means of a drive means between an operating position in which the thrust slide is located thereon with the power supply unit within the battery compartment, and a change position is movable in the thrust slide with the power supply unit is at least partially moved out of the lateral opening.

An industrial truck with a lateral change of the power supply unit and a sliding carriage is from the DE 103 47 065 A1 known. When changing the power supply unit, the overall center of gravity of the truck by the outside of the stationary triangle, that of the wheel base of a front axle and the pendulum joint of a steering axle in a truck in four-wheel design or that of the wheel base of a front axle and the steerable third wheel in a truck is formed in tricycle design, arranged weight of the power supply unit move so that the truck tilts laterally and there is a risk that the truck tilts. For a safe and easy change of the power supply unit this danger is excluded.

From the DE 10 2008 032 305 A1 is a truck with a lateral change known as a battery block power supply device known. To change the power supply device, a thrust carriage, on which the battery pack rests, moves laterally out of a battery compartment of the industrial truck in the horizontal direction or moves into the battery compartment. In order to avoid lateral tilting or overturning of the truck in a power supply device located laterally next to the battery compartment or tilting of the power supply unit, a supporting device is arranged in the region of the outer edge of the sliding carriage, which is movable between a support position lowered onto the roadway and a raised position ,

The supporting device of DE 10 2008 032 305 A1 is provided with a rolling on the road surface support roller and can be manually acted upon in the direction of a pedal operation against the force of a spring in a support position to achieve a support of the sliding carriage during retraction and extension over the support roller on the road surface.

From the EP 1 935 731 A2 is a truck with a lateral change known as a battery block power supply device known. To change the power supply device, a thrust carriage, on which the battery pack rests, moves laterally out of a battery compartment of the industrial truck in the horizontal direction or moves into the battery compartment. In order to avoid lateral tilting or overturning of the truck in a power supply device located laterally next to the battery compartment, a sliding carriage is provided on the sliding carriage swinging support roller arranged as a support device, which is automatically lowered by the spring force and / or weight force on the roadway when extending the sliding carriage in the battery changing position to support the push carriage when retracting and extending on the road.

However, a supporting device arranged on the sliding carriage, which supports the sliding carriage with a supporting roller on extension and retraction of the sliding carriage on the road surface, causes problems on uneven road surface, since an insufficient adaptation of the supporting roller to the roadway level can result. In addition, the carrying capacity of such a support roller is limited, so that in power supply units with a correspondingly high weight, for example, large battery blocks weighing more than one ton, several support rollers and support devices must be provided to the weight of the power supply unit via the thrust carriage on the road surface to be able to support.

The present invention has for its object to provide an industrial truck of the type mentioned, in which a safe and easy change of the power supply unit is made possible regardless of the nature of the road surface and high weight of the power supply unit.

This object is achieved in that the vehicle body is provided with a directly connected to the vehicle body supporting device, which automatically extends the vehicle body against a lateral tilting when extending the sliding carriage from the operating position to the change position and when retracting the sliding carriage from the change position to the operating position locked, wherein the support device directly egen the vehicle body locks a lateral tilting when changing the power supply unit.

The idea according to the invention therefore consists in locking the vehicle body directly against lateral tilting when changing the energy supply unit with an automatically actuated supporting device. In the supporting device according to the invention, which is connected directly to the vehicle body and locks it against lateral tilting, occurs during extension and retraction of the sliding carriage no relative movement on the supporting device, so that the supporting device regardless of the nature of the road surface the truck securely locked against lateral tilting. Due to the direct connection of the supporting device to the vehicle body, lateral tilting of the industrial truck when changing the energy supply unit can also be avoided with only one supporting device according to the invention, even with a high weight of the energy supply unit. This results in low construction costs for the supporting device even at high weights of the power supply unit. Due to the automatic actuation of the support device, the operational safety is further increased, since during the extension and retraction of the power supply unit, the support device is automatically acted upon in a support position in order to lock the vehicle body against lateral tilting.

According to an advantageous embodiment of the invention, the supporting device is in operative connection with a counterweight of the vehicle body or a driver's protective roof or a frame component of the vehicle body and supports the vehicle body on the road surface. With a support device, which is in operative connection with the counterweight or a driver's roof or a frame member and thus the vehicle body and goes in a support position on the ground, the vehicle body can be locked in a simple manner when changing the power supply unit against lateral tilting.

According to a further advantageous embodiment of the invention, the supporting device is in operative connection with a counterweight of the vehicle body or a driver's protective roof or a frame component of the vehicle body and locks the vehicle body relative to the pendulum-suspended steering axle. With such a support device, the pendulum bearing of the steering axle can be blocked, whereby the tipping line of the truck is displaced to the outside, and thus a lateral tilting of the truck when changing the power supply unit can be avoided in a simple and secure manner.

If the truck is provided with a arranged in the roof area of the driver's roof pitch drive a mast, the support device may also be in operative connection with a tilt drive support of the vehicle body, which may be formed as part of the driver's roof or the vehicle frame or as a separate component.

Particular advantages arise when the thrust carriage by means of a drive device, in particular a hydraulic Ausschubzylindereinrichtung, between the operating position and the change position is actuated. In conjunction with the automatically actuated support device, a safe and easy change of the power supply unit can be achieved. The Ausschubzylindereinrichtung may in this case be formed by a double-acting hydraulic cylinder having a force acting in the direction of the operating position pressure chamber for retracting the sliding carriage and acting in the direction of the Wechseistellung pressure chamber for extending the sliding carriage. It is alternatively possible to form the Ausschubzylinderanordnung of two oppositely arranged single-acting hydraulic cylinders to extend the thrust carriage in the Wechseistellung and retract to the operating position.

According to a preferred embodiment of the invention, the support device is formed by a hydraulic Abstützzylindereinrichtung. With a hydraulic support cylinder can be locked with little construction effort and in a simple way, the vehicle body when changing the power supply unit against lateral tilting or tilting.

With regard to a low construction cost and a simple and safe operating behavior when changing the power supply unit special advantages arise when a common hydraulic power source is provided for acting on the Ausschubzylindereinrichtung and the Abstützzylindereinrichtung.

According to one embodiment of the invention, the Ausschubzylindereinrichtung has a force acting in the direction of change pressure chamber and acting in the direction of the operating pressure chamber and the Abstützzylindereinrichtung is designed as a single-acting cylinder having a force acting in the direction of the support pressure chamber, wherein acting in the direction of the support position Pressure chamber of the support cylinder device is connected to the force acting in the direction of the change position pressure chamber Ausschubzylindereinrichtung. By connecting the force acting in the direction of the support position pressure chamber of Abstützzylindereinrichtung with acting in the direction of change position pressure chamber Ausschubzylindereinrichtung a common supply can be achieved by the hydraulic power source and automatic actuation of the support means in a simple manner.

The support cylinder device is preferably acted upon by means of a spring device in the direction of a release position. A single-acting support cylinder can be retracted by means of a spring device in a simple manner for releasing the locking of the vehicle body after the change of the power supply unit by means of a spring device in a release position.

According to a preferred embodiment of the invention, the Ausschubzylindereinrichtung has a force acting in the direction of the change position pressure chamber and acting in the direction of the operating position pressure chamber and the Abstützzylindereinrichtung is designed as a double-acting cylinder, the one in the direction of the support position acting pressure chamber and acting in the direction of the release position pressure chamber, wherein the force acting in the direction of the support position pressure chamber of Abstützzylindereinrichtung is connected to the acting in the direction of change pressure chamber Ausschubzylindereinrichtung and acting in the direction of the release position pressure chamber of the Abstützzylindereinrichtung with the in the direction of the operating position acting pressure chamber of Ausschubzylindereinrichtung is connected. With a double-acting support cylinder, the vehicle body can be easily locked in the support position against lateral tilting and in the release position, the lock can be canceled. If, in such a double-acting support cylinder, the pressure chamber of the support cylinder device acting in the direction of the support position is connected to the pressure chamber of the extension cylinder device acting in the direction of the change position and the pressure space of the support cylinder device acting in the direction of the release position is connected to the pressure chamber of the extension cylinder device acting in the direction of the operating position, a common supply by the hydraulic power source and an automatic actuation of the support means can be achieved in a circuitically simple manner.

Particular advantages arise when the force acting in the direction of the support position pressure chamber Abstützzylindereinrichtung an openable check valve is assigned. When located in the Abstubtzstellung Abstützzylindereinrichtung can be shut off with such a check valve and the operation of Ausschubzylindereinrichtung of the operating position in the change position in a simple manner acting in the direction of the support position pressure chamber of the support cylinder to ensure the locking of the vehicle body when changing the power supply unit. By opening the shut-off valve, the shut-off valve can be opened in the discharge direction in a simple manner in order to allow retraction of the support cylinder into the release position after the energy supply unit has been changed.

The automatic actuation of the support device during the change of the power supply unit can be achieved in a simple manner, if according to a development of the invention, a switching logic is provided which is designed such that for extending the sliding carriage from the operating position in the Changing position in a first step locking the vehicle body by driving the support device is achieved in a support position and after reaching the support position of the support device in a second step, the extension of the thrust carriage from the operating position to the change position by driving the drive device is achieved and to retract the sliding carriage of the change position to the operating position in a first step, the retraction of the sliding carriage from the change position to the operating position by driving the drive device is achieved and after reaching the operating position of the sliding carriage in a second step unlocking of the vehicle body by a control of the supporting device in a release position is achieved. With such a switching logic ensures that during extension and retraction of the sliding carriage, the support device is in the support position in which the vehicle body is locked against lateral tilting or tilting, so that a simple and safe change of the power supply unit is achieved.

The switching logic preferably comprises a switching device which is associated with the pressure chamber of the Ausschubzylindereinrichtung acting in the direction of the change position and the input side is in communication with the acting in the direction of the support position pressure chamber of the Abstützzylindereinrichtung. With such a switching device can be achieved in a simple manner that for extending the screed in a first step, the Abstützzylindereinrichtung is acted upon in the support position and only after the locking of the vehicle body via the Abstützzylindereinrichtung the Ausschubzylindereinrichtung is applied to the thrust slide from the operating position in the Extend change position. As a result, the locking of the vehicle body when extending the sliding carriage can be ensured in a simple manner.

With particular advantage, the switching device is provided with a bypass connection, wherein in the bypass connection a blocking valve opening in the outflow direction is arranged. With such a bypass connection, a connection of the pressure space acting in the direction of the change position pressure chamber Ausschubzylindereinrichtung can be achieved with a container in a simple manner when retracting the sliding carriage to achieve a retraction of the sliding carriage.

According to one embodiment of the invention, the switching logic comprises a further switching device, by means of the pilot-operated shut-off valve, which is assigned to the force acting in the direction of the support position pressure chamber of Abstützzylindereinrichtung, can be controlled, the further switching device on the input side with acting in the direction of the operating position pressure chamber Ausschubzylindereinrichtung in Connection stands. With such a switching valve can be ensured in a simple manner that when retracting the sliding carriage in a first step the Ausschubzylindereinrichtung is acted upon in the operating position before the check valve is opened in an open position to allow retraction of the Abstützzylindereinrichtung into the release position. As a result, the locking of the vehicle body when retracting the sliding carriage can be ensured in a simple manner.

If the Abstützzylindereinrichtung is designed as a double-acting hydraulic cylinder, there are particular advantages when the additional switching device controls the connection to the acting in the direction of the release position pressure chamber of Abstützzylindereinrichtung and is provided with a bypass connection, wherein in the bypass connection an opening in the outflow check valve is arranged. About the controlled additional switching device can be acted upon in a simple manner, the support cylinder device in the release position. The bypass connection allows a simple connection of acting in the direction of the release position pressure chamber of Abstützzylindereinrichtung with a container in the operation of the Abstützzylindereinrichtung in the support position.

According to a preferred embodiment of the invention, the switching logic is designed as a hydraulic valve device, wherein the switching device and / or the further switching device is formed by a respective pressure switching valve, in particular a pressure relief valve. With such pressure switching valves corresponding opening pressures can be set and specified in a simple manner, which ensure that the extension cylinder is moved from the operating position to the change position Ausschubzylindereinrichtung until the change position after the Abstützzylindereinrichtung was acted upon in the support position and retraction of the sliding carriage of the Change position in the operating position, the Abstützzylindereinrichtung is not actuated until the release position after the Ausschubzylindereinrichtung has acted on the thrust carriage in the operating position. Such, formed by hydraulic valves switching logic has a simple structure with low manufacturing costs.

According to an alternative embodiment of the invention, the switching logic is designed as an electronic control, wherein the switching device and / or the further switching device is formed by an electrically operated control valve with a blocking position and a flow position, wherein the control valves are actuated by the electronic control. With such electrically operated control valves can also be achieved in a simple manner in conjunction with an electronic control that the extension cylinder of the slide carriage is actuated until the change position after the Abstützzylindereinrichtung was acted upon in the support position and for retracting the thrust carriage, the Abstützzylindereinrichtung only in the release position is actuated after the Ausschubzylindereinrichtung has acted on the thrust carriage in the operating position.

With regard to a simple construction, there are advantages when the blocking position of the control valve is provided with a bypass connection, in which a check valve opening in the outflow direction is arranged. About the integrated into the blocking position of the corresponding control valve bypass connection can also easily retracting the Ausschubzylindereinrichtung into the operating position by connecting the acting in the direction of change position pressure chamber Ausschubzylindereinrichtung with the container and the extension of the Abstützzylindereinrichtung into the support position by a compound of in Direction of the release position acting pressure chamber of Abstützzylindereinrichtung be enabled with a container.

The control valves can in this case be formed by simply constructed switching valves, which are preferably actuated by a spring in the blocking position and by means of an actuating device, such as a solenoid, which is in operative connection with the electronic control device in the flow position. To control the control valves, the electronic control is advantageously connected to a sensor device which detects the operating position and the change position and a sensor device which detects the release position and the support position of the support cylinder device. With such sensor devices, which can be formed by corresponding sensors or switches, an electronic switching logic can be formed by means of the extension of the thrust carriage the Ausschubzylindereinrichtung associated control valve is actuated only in the flow position after the sensor device determines the support position of the Abstützzylindereinrichtung has and for retracting the Abstützzylindereinrichtung the Abstützzylindereinrichtung associated control valve is actuated only in the flow position after the sensor device has determined the operating position of the sliding carriage.

According to a preferred embodiment of the invention, the force acting in the direction of the support position pressure chamber of the support cylinder device is assigned a Stützkraftbegrenzungseinrichtung. With such a Stützkraftbegrenzungseinrichtung can easily be limited to a required value, the support force generated by the Abstützzylindereinrichtung to avoid overloading the Abstützzylindereinrichtung and the vehicle body or the steering axis.

The Stützkraftbegrenzungseinrichtung can be formed according to a preferred embodiment of the invention of a pressure relief valve, in particular a pressure control valve. With such a pressure control valve can be limited in a simple manner in the acting in the direction of the support position pressure chamber of the support device pressure to achieve a limitation of the supporting force.

Conveniently, the Stützkraftbegrenzungseinrichtung is provided with a bypass connection, wherein in the bypass connection a blocking valve opening in the outflow direction is arranged. With such a bypass connection, the support force limiting device can be bypassed in a simple manner in order to achieve retraction of the supporting cylinder device into the release position.

According to an advantageous development of the invention, the support device is assigned a release position determining end position monitoring device, which is preferably formed by a release position of the support device detecting sensor device, which is in operative connection with a vehicle control of the truck. With such a sensor device, the release position of the support device can be determined in a simple manner and a maloperation can be avoided in which a driving operation of the truck takes place with the support device located in the support position. If the vehicle control is designed in such a way that when the support device is not completely retracted into the release position, the truck is stopped and, if appropriate, a corresponding warning message is issued to the operator, it can be ensured in a simple manner that the industrial truck is only ready to drive when the vehicle is ready Support device is in the release position and thus the sensor device provides a corresponding signal.

According to an advantageous development of the invention, a control valve device connected to the hydraulic energy source and a container is provided for controlling the Ausschubzylindereinrichtung and the Abstützzylindereinrichtung, which is provided with a Ausschubschaltstellung and a Einfahrschaltstellung. With such a control valve device, the extension and retraction of the sliding carriage and the automatic actuation of the support cylinder device for locking and unlocking the vehicle body can be controlled in a simple manner and with low construction costs.

Appropriately, the control valve device connects in the Ausschubschaltstellung acting in the direction of the support position pressure chamber of Abstützzylindereinrichtung and the switching device with a feed line of the power source and the other switching device and acting in the direction of the operating position pressure chamber Ausschubzylindereinrichtung with a container. This can be achieved in a simple circuit technology when extending the thrust carriage from the operating position to the change position, that first the Abstützzylindereinrichtung is acted upon in the support position for locking the vehicle body, before a Ausschubbewegung the thrust carriage with controlled Zuschaltventileinrichtung done by the Ausschubzylindereinrichtung. If a double-acting support cylinder is provided, can be achieved via the bypass connection to the further Zuschaltventil in a simple manner when operating the Abstützzylindereinrichtung a connection of acting in the release position pressure chamber with the container.

If the control valve device in the Einfahrschaltstellung connects the further switching device and acting in the direction of the operating position pressure chamber Ausschubzylindereinrichtung with a feed line of the power source and the acting in the direction of the support position pressure chamber of the Abstützzylindereinrichtung and the switching device connects to a container, is achieved in a simple circuit technology, in that the thrust slide is first retracted into the operating position before the retraction movement of the support cylinder into the release position for unlocking the vehicle body takes place when the further adjuster valve device is activated. The bypass connection to the switching device allows in a simple manner a connection of the pressure chamber acting in the change position of the Ausschubzylindereinrichtung with the container when retracting the sliding carriage.

Particular advantages can be achieved if a shut-off valve opening in the direction of the control valve is arranged in the delivery line guided by the energy source to the control valve device. If the control valve device is in the retracted position after the power supply unit has been replaced during normal operation of the truck, a leakage-free shut-off of the pressure space of the supporting cylinder device acting in the direction of the retraction position and of the pressure chamber of the ejecting cylinder device acting in the direction of the operating position can be achieved with such a shut-off valve. An uncontrolled movement of the Abstützzylindereinrichtung in the shut-off and uncontrolled extension of the screed, for example, by external forces such as centrifugal forces during cornering or shocks when driving through bumps, can be avoided in a simple and secure way.

Preferably, the delivery line is associated with a pressure limiting device. With such a pressure limiting device, such as a pressure relief valve, can easily limit and safeguard the maximum supporting force generated by the Abstützzylindereinrichtung in the Support position can be achieved and the entire system to be protected from overload.

As a hydraulic energy source for supplying the Abstützzylindereinrichtung and Ausschubzylindereinrichtung an existing hydraulic circuit of the truck, such as a working hydraulics of the truck can be used. The control valve device can in this case be formed by a valve section of a control valve block of the working hydraulics. Alternatively, the hydraulic energy source can be formed by a pressure medium accumulator, which can be loaded during operation of the truck. If the power supply unit is designed as a battery block, a change of a discharging battery block can be achieved in a simple manner. Preferably, the hydraulic energy source is formed by an electric hydraulic compacting unit. Such a hydraulic compacting unit has a low energy consumption, so that a drive of the electric hydraulic compacting unit with the remaining energy present in a discharged battery block when changing the battery pack is made possible.

Figur 1

ein erfindungsgemäßes Flurförderzeug in einer perspektivischen Darstellung,

Figur 2

eine erste Ausführungsform der Erfindung,

Figur 3

eine Weiterbildung der Erfindung,

Figur 4

eine Weiterbildung der Erfindung,

Figur 5

eine Ausgestaltungsform der Erfindung und

Figur 6

eine zweite Ausführungsform der Erfindung.

Further advantages and details of the invention will be explained in more detail with reference to the embodiments illustrated in the schematic figures. This shows

FIG. 1

an inventive truck in a perspective view,

FIG. 2

a first embodiment of the invention,

FIG. 3

a development of the invention,

FIG. 4

a development of the invention,

FIG. 5

an embodiment of the invention and

FIG. 6

a second embodiment of the invention.

In the FIG. 1 is an inventive, designed as a counterbalance forklift truck 1 shown in a perspective view. In a middle section of a vehicle body 5 of the industrial truck 1 formed by a frame 2, a counterweight 3 and a driver's protective roof 4, a battery compartment 6 for receiving a power supply device 7 designed, for example, as a battery block is formed. The vehicle body 5 is provided with a lateral opening 8, by means of which the energy supply unit 7 can be at least partially moved out of the battery compartment 6 in the lateral and horizontal direction for changing the energy supply unit 7 or moved into the battery compartment 6. In the FIG. 1 a change position is shown, in which the power supply unit 7 is at least partially laterally outside of the battery compartment 6.

In the FIG. 1 are further in the front area of the truck 1, two wheels 10a, 10b shown, for example, are designed as drive wheels to the rear-side area provided with steered wheels steering axle 11, which is preferably designed as a pendulum axis.

The trained as a swing axle steering axle 11 is - as in the FIG. 2 is shown in detail - suspended by means of a preferably centrally arranged in the vehicle longitudinal direction pendulum joint 12 on the vehicle body 5, for example, the counterweight 3, pendulum.

In the FIG. 2 Furthermore, a slide carriage 9 is shown, on which the power supply unit 7 stands up. The sliding carriage 9 can be moved out of the battery compartment 6 of the truck 1 in the lateral direction or moved into the battery compartment 6. The sliding carriage 9 is mounted linearly displaceably by means of a guide 13 in the region of the battery compartment 6 on the vehicle body 5 in the transverse direction of the industrial truck 1.

The slide carriage 9 is movable by means of a drive device 15 between an operating position in which the slide carriage 9 is located inside the battery compartment 6 and the change position in which the slide carriage 9 is located at least partially outside the battery compartment 6.

The drive device 15 is formed by a hydraulic Ausschubzylindereinrichtung 16, which is formed for example by a double-acting cylinder assembly comprising a hydraulic cylinder. The Ausschubzylindereinrichtung 16 has an acting in the direction of the operating position pressure chamber 16a and acting in the direction of the change position pressure chamber 16b. The Ausschubzylindereinrichtung 16 is in this case arranged with a cylinder housing on the vehicle body 5 and is connected to a retractable or retractable piston rod 16c with the thrust slide 9 in operative connection.

According to the invention, a support device 20 is provided, which is formed by a hydraulic support cylinder device 21 and locks the vehicle body 5 against lateral tilting. The support cylinder device 21 is in accordance with FIG. 2 formed by a double-acting hydraulic cylinder, which has a force acting in the direction of a support position pressure chamber 21a and acting in the direction of a release position pressure chamber 21 b. The support cylinder device 21 is attached, for example with a cylinder housing on the counterweight 3 or the driver's roof 4 or a frame member or at a arranged in the roof area of the driver's roof 4 tilting a mast on a tilt drive support of the vehicle body and has a retractable or retractable piston rod 21 c, which can be brought into connection with the steering axle 11. On the piston rod 21 c in this case a corresponding support leg 22 may be arranged. The support cylinder 21 is in this case arranged such that the piston rod 21 c engages the steering axle 11 in the vehicle transverse direction to the pendulum joint 12 spaced on the provided with the side opening 8 vehicle side to block the pendulum movement of the steering axle 11, the vehicle body 5 when changing the Power supply unit 7 to lock against lateral tilting. It is alternatively possible, for example, to fix the supporting cylinder device 21 with a cylinder housing on the steering axle 11, so that the retractable or retractable piston rod 21 c can be brought into connection with the counterweight 3 or the driver's protection roof 4.

For common supply of the Ausschubzylindereinrichtung 16 and the Abstützzylindereinrichtung 21 designed as a hydraulic compacting unit 30 hydraulic energy source is provided which comprises a driven by an electric motor 31 hydraulic pump 32, via a suction filter or a Suction strainer sucks pressure medium from a container 33 and conveys it into a delivery line 34. For controlling the Ausschubzylindereinrichtung 16 and the Abstützzylindereinrichtung 21, a control valve device 35 is provided, which is connected to the delivery line 34 and a guided to the container 33 tank line 36 and connected by connecting lines 37a, 37b with the Ausschubzylindereinrichtung 16 and the Abstützzylindereinrichtung 21. The connecting line 37a connected to a connection B of the control valve device 35 is connected here to the pressure chamber 16a of the Ausschubzylindereinrichtung 16 acting in the direction of the operating position and to the pressure chamber 21b of the supporting cylinder device 21 acting in the direction of the release position. The acting in the direction of the release position pressure chamber 21 b of the support cylinder device 21 is thus in communication with the acting in the direction of the operating position pressure chamber 16a of Ausschubzylindereinrichtung 16. For this purpose, branches at a connection point D from the guided to the pressure chamber 16a of the Ausschubzylindereinrichtung 16 connecting line 37a to the pressure chamber 21 b of the support piston 21 guided connection line 38a. The connecting line 37b connected to a connection A of the control valve device 35 is connected to the pressure chamber 16b of the Ausschubzylindereinrichtung 16 acting in the direction of the change position and to the pressure space of the support cylinder device 21 acting in the direction of the support position 21a. The force acting in the direction of the support position pressure chamber 21 a of the support cylinder 21 is thus connected to the force acting in the direction of the change position pressure chamber 16 b of the Ausschubzylindereinrichtung 16 in combination. For this purpose, branches at a connection point C of the guided to the pressure chamber 16b of Ausschubzylindereinrichtung 16 connecting line 37b to the pressure chamber 21 a of the support cylinder device 21 guided connection line 38b.

The control valve device 35 is designed as a switching valve and has a retraction switching position 35a in which the connecting line 37a and the connecting line 38a is connected to the delivery line 34 of the pump 32 and the connecting line 37b and the connecting line 38b is connected to the container line 36. In a Ausschubschaltstellung 35b of the control valve device 35, the connecting line 37b and the connecting line 38b is connected to the delivery line 34 and the connecting line 37a and the connecting line 38a connected to the container line 36. The control valve device 35 is of a electrically actuated switching valve formed, which is acted upon by means of a spring in the retraction 35a and can be acted upon by a trained as a solenoid actuator in the Ausschubschaltstellung 35b.

In the delivery line 34, a shut-off valve 39 which opens in the direction of the control valve device 35 and which is formed by a check valve which opens in the direction of the control valve device 35, is furthermore arranged.

The delivery line 34 is associated with a pressure limiting device 40, which is formed by a pressure relief valve.

For automatic actuation of the support device 20 when changing the power supply unit 7, a switching logic 50 is provided, which includes a switching device 51, which is assigned to the acting in the direction of change position pressure chamber 16b of the Ausschubzylindereinrichtung 16. The switch-on device 51 is arranged between the connection point C and the pressure chamber 16b of the Ausschubzylindereinrichtung 16 in the connecting line 37b and thus is on the input side with the force acting in the direction of the support position pressure chamber 21 a of the support cylinder 21 in conjunction. The switching device 51 is formed by a pressure switching valve 52, which is formed in the illustrated embodiment of a pressure relief valve. The pressure switching valve 51 is acted upon by a spring 53 in a switch position blocking the connecting line 37b. In the direction of a switch position releasing the connecting line 37b, the pressure-adjusting valve 52 can be acted upon by the pressure present at the connection point C and thus in the pressure space 21a of the supporting cylinder device 21. For this purpose, a corresponding control line 54 is provided. The switch-on device 51 is furthermore provided with a bypass connection 55 which bypasses the pressure switch valve 52 and in which a check valve 56 opening in the outflow direction is arranged. The check valve 56 is formed in the illustrated embodiment by a spring-loaded check valve which opens in the direction of the connection point C. The switching logic 50 further comprises a further switching device 61, which is assigned to the force acting in the direction of the retraction position pressure chamber 21 b of the support cylinder 21. The further switching device 61 is disposed between the connection point D and the pressure chamber 21 b in the connecting line 38 a and thus is on the input side with the in Direction of the operating position acting pressure chamber 16a of Ausschubzylindereinrichtung 16 in conjunction. The switching device 61 is formed by a pressure switching valve 62, which is formed in the illustrated embodiment of a pressure relief valve. The pressure switching valve 62 is acted upon by a spring 63 in a switching position blocking the connecting line 38a. In the direction of a switching position releasing the connecting line 38a, the pressure switching valve 62 can be acted upon by the pressure present at the connection point D and thus in the pressure chamber 16a of the ejection cylinder device 16. For this purpose, a corresponding control line 64 is provided. The switch-on device 61 is furthermore provided with a bypass connection 65 which bypasses the pressure switch valve 62 and in which a shut-off valve 66 which opens in the outflow direction is arranged. The check valve 66 is formed in the illustrated embodiment of a spring-loaded check valve, which opens in the direction of the connection point D.

In the force acting in the direction of the support position pressure chamber 21a of the support cylinder device 21 connecting line 38b a aufsteuerbares check valve 70 is arranged, which blocks the pressure chamber 21 a in the outflow and can be controlled by a pilot control device in a flow position. The check valve 70 is preferably formed by a in the direction of the pressure chamber 21 a opening check valve, which can be controlled by means of a pending in a pilot line 71 control pressure in a flow position. The check valve 70 is vorsteubar by means of the further switching device 61, wherein the pilot line 71 is connected to a connection point E of the connecting line 38 a between the pressure chamber 21 b and the other switching device 61.

The extension device 15 with the automatically actuated support device 20 for changing the power supply unit 7 according to the FIG. 2 works as follows.

To extend the sliding carriage 9 with the power supply unit 7, the control valve device 35 of the hydraulic compacting unit 30 is energized and thus acted upon in the Ausschubschaltstellung 35b. Subsequently, the electric motor 31 is driven and thus energized, whereby the pump 32 is driven. This sucks pressure medium from the container 33 via the suction filter or the suction strainer and promotes pressure medium via the opened shut-off valve 39 and operated in the Ausschubstellung 35b control valve device 35 in the connecting line 37b. Of the System pressure is secured via the pressure relief valve 40. The pressure switching valve 52 of the switching device 51 is in the blocking position, so that the connection to the pressure chamber 16 b of Ausschubzylindereinrichtung 16 via the pressure switching valve 52 and the check valve 56 of the bypass connection 55 is shut off. The pumped by the pump 32 pressure fluid thus flows at the connection point C in the connecting line 38b and the opening in the inflow direction check valve 70 in the direction of the support position acting pressure chamber 21a of the support cylinder 21st The piston rod 21c is in the FIG. 2 acted upon below. In this case, the pressure fluid flows from the force acting in the direction of the retracted position pressure chamber 21 b of the support cylinder 21 via the bypass connection 65 and the opened check valve 66 of the other switching device 61 in the connecting line 38a and the connection point D in the connecting line 37a, via the in the Ausschubschaltstellung 35b actuated control valve means 35 to the container line 36 and thus the container 33 is connected. The support cylinder 21 is in this case actuated in the support position until the piston rod 21c touches the support leg 22 on the oscillating steering axle 11 and blocks a pendulum of the steering axle 11. As a result, the tipping line of the truck 1 moves to the outside, wherein the vehicle body 5 is fixed relative to the steering axle 11 and thus locked against lateral tilting, whereby a tilting or lateral tilting of the vehicle body 5 is prevented when the power supply unit 7. After completion of the extension movement of the piston rod 21 c of the support cylinder 21, the pressure in the connecting lines 38b and thus the connecting line 37b increases, whereby the pressure switching valve 52 of the switching device 51 is controlled against the force of the spring 53 in the open position and the connection to the in Direction of change position acting pressure chamber 16 b of Ausschubzylindereinrichtung 16 releases. In this state, the releasable check valve 70 prevents a flow of pressure medium from the support cylinder device 21 in the connecting line 37 b, whereby the blocking of the steering axle 11 and thus the locking of the vehicle body 5 is maintained. The pressure medium flow of the pump 32 now flows into the pressure chamber 16 b of Ausschubzylindereinrichtung 16 and pushes the piston rod 16 c, which is connected to the thrust slide 9, in the FIG. 2 right into the change position. The slide carriage 9 is here stored and guided in the guides 13. Via the connecting line 37a and operated in the Ausschubschaltstellung 35b Control valve device 35, the pressure chamber 16a of Ausschubzylindereinrichtung 16 is connected to the container 33. A pressure medium flow from the connection point D via the connecting line 38 a into the supporting cylinder device 21 is prevented by the pressure switching valve 62 and the check valve 66 in the bypass line 65.

If the slide carriage 9 has been extended far enough into the change position, the electric motor 31 and then the control valve device 35 is de-energized. The control valve device 35 is acted upon by the spring in the Einfahrschaltstellung 35a. As a result, the pressure in the connection line 37b drops to the tank pressure level. The pressure switching valve 52 is thereby acted upon by the spring 53 in the blocking position. The unlockable check valve 70 is in the locked position and maintains the pressure in the pressure chamber 21 a of the support cylinder 21 upright. A back flow of the pressure medium from the connecting line 37 a in the pump 32 is prevented by the check valve 39. The power supply unit 7 can be changed in this state.

For retracting the power supply unit 7, the electric motor 31 is energized, the control valve device 35 remains energized and is in the retraction position 35a. The pump 32 conveys pressure fluid via the connecting line 37a in the direction of the retraction position acting pressure chamber 16a of the Ausfahrzylindereinrichtung 16. The additional switching device 61 with the pressure switch valve 62 in the blocking position and the check valve 66 in the bypass connection 65 prevents in this situation that pressure means of Connection point D in the direction of the release position acting pressure chamber 21 b of the support cylinder 21 flows. Pressure fluid from the pressure chamber 16b of the Ausschubzylindereinrichtung 16 can flow via the connecting line 37b, the piloted check valve 56 in the bypass line 55 to the befindlichem in the retraction 35a control valve means 35 and thus via the container line 36 into the container 33. The higher pressure level in the pressure chamber 21a of the support cylinder device 21 in this case holds the unlockable check valve 70 in the blocking position, so that via the connection point C no pressure medium in the pressure chamber 21 a of the support cylinder 21 can flow. Once the piston rod 16c after in the FIG. 2 moved left into the end position of the operating position and the Ausschubzylindereinrichtung 16 the Operating position has reached, the pressure in the connecting line 37a and the connecting line 38a increases, whereby the pressure switching valve 62 of the other switching device 61 is controlled against the spring 63 in the open position and the connecting line 38a releases. Pressure medium now flows on the one hand via the connection point E in the pilot control line 71 and controls the unlockable check valve 70 in the open position, so that pressure fluid from the pressure chamber 21 a of the support cylinder 21 via the connecting line 38b to the control valve device 35 and the container line 36 flow into the container 33 can. On the other hand, 62 of the pump 32 via the open-pressure switching valve pressure medium in the acting in the direction of the retracted position pressure chamber 21 b of the support cylinder 21 promoted whereby the piston rod 21 c with the support leg 22 in the FIG. 2 moves up into the release position. The blocking of the steering axle 11 is thus canceled. Once the piston rod 21 c has reached its end position, the electric motor 31 can be switched off.

A sagging of the piston rod 21 c of the Abstützzylindereinrichtung 21 and an extension of the slide carriage 9 during operation of the truck by external forces, such as shocks when driving through bumps or centrifugal forces during cornering, are in the retracted position 35a control valve means 35 through the check valve 39th prevented.

In the FIG. 2 results in the support position of the support cylinder 21, a maximum supporting force on the support cylinder 21, which is determined by the set value of the pressure relief valve 40. This can lead to an unnecessarily large load on the components involved in the supporting process of the vehicle body 5.

According to the FIG. 3 is the force acting in the direction of the support position pressure chamber 21 a of the support cylinder 20 a Stützkraftbegrenzungseinrichtung 80 assigned. The Stützkraftbegrenzungseinrichtung 80 is formed by a pressure-closing valve 81, which is formed in the illustrated embodiment of a pressure control valve. The pressure closing valve 81 is acted upon by a spring 82 in a switching position releasing the connecting line 38b. In the direction of a connecting line 38b shut-off switching position, the pressure-closing valve 81 is of the pressure in the pressure chamber 21 a of the support cylinder 21 acted upon. For this purpose, a corresponding control line 83 is provided. The support force limiting device 80 arranged in the connecting line 38b is furthermore provided with a bypass connection 85 which bypasses the pressure-closing valve 81 and in which a check valve 86 which opens in the outflow direction is arranged. The check valve 86 is formed in the illustrated embodiment by a spring-loaded check valve which opens in the direction of the connection point C.

In the FIG. 3 increases during the Abstützvorgangs after completing the extension movement of the piston rod 21 c of the support cylinder 21, the pressure in the connecting line 38b and thus in the pressure chamber 21 a until the pressure closing valve 81 via the control line 83 against the force of the spring 82 in the locked position is acted upon and shuts off the connection to the pressure chamber 21 a. The maximum supporting force of the supporting cylinder device 21 can thus be limited to a desired value with the aid of the pressure-closing valve 81 and the spring 82. When retracting the Abstützzylindereinrichtung 21 in the release position after opening the other switching device 61 and the Aufsteuern of the check valve 70 can pressure medium from the pressure chamber 21 a of the support cylinder 21 via the check valve 86 in the bypass connection 85 to the connection point C and operated in the retracted position 35 a Control valve device 35 to flow to the container 33.

Both Figures 2 and 3 It can come to operating conditions in which after the change of the power supply unit 7 and after reaching the operating position of the sliding carriage 9 by a too early shutdown of the electric motor 31, the support cylinder 21 was not actuated in the release position, so that the truck 1 operated with blocked steering axle 11 becomes. According to the FIG. 4 an additional end position monitoring 90 is provided for the release position of the support device 20. The end position monitoring 90 comprises a sensor device 91, for example a switch or a suitable sensor, which detects and monitors the upper end position of the supporting cylinder device 21. The sensor device 91 is in operative connection with a vehicle control 92. About the vehicle controller 92, the truck 1 can be stopped when not fully retracted piston rod 21 c of the support cylinder device 21 and thus not in the release position befindlicher support device 20 and / or will issue a warning message to avoid operation of the truck 1 when the steering axle 11 is blocked.

In the FIG. 5 instead of a support cylinder device 21 formed by a double-acting hydraulic cylinder, the support cylinder device 21 is designed as a single-acting hydraulic cylinder which has a pressure chamber 21 a acting in the direction of a support position and can be acted upon by means of a spring device 25 in the release position. The additional switching device 61 is the output side to the pilot line 71 of the check valve 70 and serves to open the check valve 70 to the connection of the pressure chamber 21 a with the container 33 by the spring means 25, an actuation of the piston rod 21 c of the support cylinder device 21 in the release position achieve.

Both FIGS. 2 to 5 is the switching logic as a hydraulic switching logic with hydraulic valve devices formed, which is formed by the switching device 55 as a pressure-switching valve 52 with the bypass connection 51 and the pressure-switching valve 62 with the bypass connection 65 existing additional switching device 61.

In the embodiment according to the FIG. 6 the switching logic 50 is formed by an electronic control 100, wherein the switching device 51 is formed in the connecting line 37b by a controllable by the electronic control 100 control valve 101 and the further switching device 61 by a controllable by the electronic control 100 control valve 111. The control valves 101, 111 are designed as switching valves and each have a blocking position 101 a, 111 a and a flow position 101 b, 111 b. The control valves 101, 111 are each by means of a spring 102, 112 in the blocking position 101 a, 111 a and by means of an electrical actuator 103, 113, for example, a solenoid, which communicate with the electronic control 100 in the flow position 101 b, 111 b acted upon.

The blocking position 101 a, 111 a of the control valves 101, 111 is in each case provided with a bypass connection 105, 115, wherein an opening in the outflow direction check valve 106, 116, for example, a check valve, in the blocking position 101 a, 111 a is provided. The check valve 106 of the control valve 101 opens in this case Direction to the connection point C. Accordingly, the check valve 116 of the control valve 111 opens to the connection point D.

The switching logic 50 of the FIG. 6 furthermore comprises a sensor device 120, which is in communication with the electronic control 100 and with which the operating position and the change position of the ejection cylinder device 16 and thus of the sliding carriage 9 can be detected. For this purpose, the sensor device 120 comprises a switch or a sensor 120a for detecting the operating position and a switch or a sensor 120b for detecting the change position. For actuating the sensors 120a, 120b, a corresponding switching lug 121 is arranged on the piston rod 16c of the ejection cylinder device 16 or on the push carriage 9. Furthermore, the switching logic 50 comprises a sensor device 125 in communication with the electronic control 100, with which the support position and the release position of the support device 20 can be detected. For this purpose, the sensor device 125 comprises a switch or a sensor 125a for detecting the release position and a switch or a sensor 125b for detecting the supporting position of the supporting cylinder device 21. For actuating the sensors 125a, 125b, a corresponding switching lug is provided on the piston rod 21c of the supporting cylinder device 21 126 arranged.

The extension device 15 with the automatically actuated support device 20 for changing the power supply unit 7 according to the FIG. 6 works as follows.

To extend the sliding carriage 9 with the power supply unit 7 in the change position, the control valve device 35 of the hydraulic compacting unit 30 is driven and acted upon in the Ausschubschaltstellung 35b. Subsequently, the electric motor 31 is energized and drives the pump 32 at. This pump 32 sucks pressure medium from the container 33 via a suction filter or suction strainer and conveys via the shut-off valve 39 and operated in the Ausschubschaltstellung 35b control valve device 35 in the connecting line 37b. The system pressure is secured via the pressure relief valve 40. The switching valve 101 is de-energized and is in the blocking position 101 a and blocks the connection to the force acting in the direction of Ausschubstellung pressure chamber 16 b of Ausschubzylindereinrichtung 16 from. Pressure medium flows at the connection point C in the connecting line 38b and via the check valve 70 in the direction of Supporting position acting pressure chamber 21a of the support cylinder device 21. The support cylinder 21 is acted upon in the support position, the piston rod 21 c after in the FIG. 6 extends below. In this case, the pressure fluid flows from the pressure chamber 21b via the connecting line 38a and via the check valve 116 of the de-energized and in the blocking position 111a control valve 111 to the connection point D and thus into the connecting line 37a. The connection line 37a is connected to the container 33 via the container line 36 when the control valve device 35 is in the Ausschubschaltstellung 35b. The piston rod 21 c is extended so long in the support position until the support leg 22 touches down on the oscillating steering axle 11 and blocks a pendulum of the steering axle 11. As a result, the tilting line of the truck moves outward to prevent tilting or tilting when the power supply unit is extended. In the support position, the switching lug 126 arranged on the piston rod 21c actuates the sensor 125b. As a result, the controller 100 energizes the actuator 103 of the control valve 101, whereby the control valve 101 is acted upon in flow position 101 b and opens the connecting line 37 b. In this state, the pilot-operated check valve 70 prevents a flow of pressure medium from the support cylinder device 21 into the connection line 37b, whereby the blocking of the steering axle 11 is maintained. Pressure fluid flows into the pressure chamber 16b, whereby the piston rod 16c of the Ausschubzylindereinrichtung 16 after in the FIG. 6 right into the change position extends. Via the connecting line 37a and in the Ausschubschaltstellung 35b located control valve means 35, the pressure chamber 16a of the Ausschubzylindereinrichtung 16 is connected to the container 33. A pressure medium flow from the connection point D via the connecting line 38a into the pressure chamber 21b of the supporting cylinder device 21 is prevented by the non-energized control valve 111 located in the blocking position 111a. In this Ausschubvorgang the sliding carriage 9, the arranged on the piston rod 16c switching lug 121 deactivates the sensor 120a. In this case, the controller 100 is designed in such a way that, in the case of such a signal of the sensor 120a, no activation of the actuating device 113 of the control valve 111 takes place during the ejection process. If the Ausschubzylindereinrichtung 16 in the change position, the switching flag 121 activates the sensor 120b, whereby the control of the control valve 101 is terminated and the switching valve 101 is acted upon by the spring 102 in the blocking position 101 a. Subsequently, the electric motor 31 and then the control valve device 35 is de-energized. The control valve device 35 is thus acted upon by the spring in the insertion switching position 35a. As a result, the pressure in connection line 37b drops to the tank pressure level. The releasable check valve 70 keeps the pressure continues in the pressure chamber 21 a of the support cylinder device 21. A backflow of the pressure medium from the connecting line 37 a in the hydraulic pump 32 is prevented by the check valve 39. The power supply unit 7 can be changed in this state.

For retracting the power supply unit in the operating position of the electric motor 31 is energized, the control valve means 35 remains energized and in the insertion switching position 35a. The control valve 111 is not controlled and is in the blocking position 111 a, in which prevents pressure medium from the connection point D in the pressure chamber 21 b of the support cylinder 21 to flow can. The pressure fluid from the pressure chamber 16b of Ausschubzylindereinrichtung 16 flows through the connecting line 37b, the check valve 106 of the non-driven and in the blocking position 101 a control valve 101 to the control valve means 35 and thus via the container line 36 into the container 33. The higher pressure level in the Pressure chamber 21 a of the support cylinder 21 holds the unlockable check valve 70 is closed, so that via the connection point C no pressure medium in the pressure chamber 21 a of the support cylinder 21 can flow. As soon as the piston rod 16c reaches the operating position and is retracted, the switching flag 121 activates the sensor 120a. The controller 100 then energizes the actuator 113 of the control valve 111, whereby this is acted upon in the flow position 111b. Pressure medium is now promoted on the one hand via the connection point E in the pilot line 71, whereby the unlockable check valve 70 is turned on, so that pressure medium from the pressure chamber 21a of the support cylinder device 21 via the connecting line 38b to the connection point C and via the connecting line 37b and the control valve device 35 to the container 33 can flow out. On the other hand, pressure medium via the connecting line 38 a and the operated in the flow position 111 b switching valve 111 flow into the pressure chamber 21 b of the support cylinder 21, whereby the Abstützzylindereinrichtung 21 is acted upon in the release position and the piston rod 21 c in the FIG. 6 retracts above. The blocking of the steering axle 11 is thus canceled. Once the piston rod 21 c has reached its end position in the release position, the switching flag 126 activates the sensor 125a. The controller 100 then stops the control of the control valve 113. In addition, the electric motor 31 can be switched de-energized. A sagging of the piston rod 21 c of the supporting cylinder device 21 or an extension of the sliding carriage 9 by external forces (for example, impacts or centrifugal forces) is prevented by the shut-off valve 39.

Instead of the sensors 120a, 120b and 125a, 125b, the sensor device 120 or 125 may also be formed by one or more pressure sensors with which the pressure in the pressure chambers 21 a and 21 b for determining support position or retraction position or the pressure can be determined in the pressure chambers 16a and 16b for determining the operating position or the change position.

With the hydraulic switching logic 50 according to the FIGS. 2 to 5 or the electronic switching logic 50 according to the FIG. 6 is thus achieved and ensured that for the extension of the thrust carriage 9 from the operating position to the change position in a first step locking the vehicle body 5 is achieved by a control of the support device 20 in the support position and after reaching the support position of the support device 20 in a second step the extension of the thrust carriage 9 from the operating position to the change position by driving the drive device 15 is achieved and retracting the carriage 9 from the change position to the operating position in a first step, the retraction of the slide carriage 9 from the change position to the operating position by a control of Drive device 15 is achieved and after reaching the operating position of the sliding carriage in a second step, an unlocking of the vehicle body 5 is achieved by a control of the support device 20 in a release position.

This ensures that the vehicle body 5 is automatically stabilized before the extension of the power supply unit 7 in the change position and lateral tilting or lateral tipping is prevented, and this support of the vehicle body 5 is automatically canceled after retraction of the power supply unit 7 in the operating position , A faulty operation by the operator is thus excluded in a simple manner. Overall, the truck 1 according to the invention allows a simple and safe change of the power supply unit 7, which can be done regardless of the nature of the road surface by the support of the vehicle body 5 relative to the pendulum suspended steering axle 11 and the support 20 can be used with low construction costs for high weights of power supply units 7.

The invention is not limited to the embodiments shown in the figures. The embodiment of the FIG. 5 with a single-acting hydraulic cylinder as Abstützzylindereinrichtung 21 can also be provided without Endlagenüberwachung 90 and / or without Stützkraftbegrenzungseinrichtung 80.

The embodiment of the FIG. 6 with an electronic switching logic 50 can also be provided with a single-acting hydraulic cylinder as Abstützzylindereinrichtung 21 or additionally with the Stützkraftbegrenzungseinrichtung 80. In addition, by connecting the sensor 125a with the vehicle controller according to the FIG. 4 an end position monitoring 90 for the release position of the Abstützzylindereinrichtung 21 are provided.

Claims (31)

1. Industrial truck (1), in particular counterweight fork-lift truck, having a vehicle body (5) and a power supply unit (7), in particular a battery block, which is arranged in a battery compartment (6) within the vehicle body (5), the vehicle body (5) being provided with a lateral opening (8) and it being possible for the power supply unit (7) to be moved through the lateral opening (8) in the horizontal direction relative to the battery compartment (6), the power supply unit (7) standing on a displacement carriage (9) which is arranged such that it can be displaced in the transverse direction in the battery compartment (6) and can be moved between an operating position and a changing position, and the industrial truck (1) comprising a steering axle (11) which is suspended in a floating manner, characterized in that the vehicle body (5) is provided with a supporting apparatus (20) which is connected directly to the vehicle body (5) and, during the extension of the displacement carriage (9) from the operating position into the changing position and during retraction of the displacement carriage (9) from the changing position into the operating position, locks the vehicle body (5) automatically against lateral inclination, the supporting apparatus (20) locking the vehicle body (5) directly against lateral inclination during the changing of the power supply unit (7).
2. Industrial truck according to Claim 1, characterized in that the supporting apparatus (20) is operatively connected to a counterweight (3) of the vehicle body (5) or a driver protective roof (4) of the vehicle body (5) or a frame component or, in the case of an inclined drive of a lifting mast, which inclined drive is arranged in the roof region of the driver protective roof (4), to an inclined drive support and supports the vehicle body (5) on the roadway surface.
3. Industrial truck according to Claim 1, characterized in that the supporting apparatus (20) is operatively connected to a counterweight (3) of the vehicle body (3) or a driver protective roof (4) of the vehicle body or a frame component or, in the case of an inclined drive of a lifting mast, which inclined drive is arranged in the roof region of the driver protective roof (4), to an inclined drive support and locks the vehicle body (5) with respect to the steering axle (11).
4. Industrial truck according to one of Claims 1 to 3, characterized in that the displacement carriage (9) can be actuated between the operating position and the changing position by means of a drive device (15), in particular a hydraulic pushing-out cylinder device (16).
5. Industrial truck according to one of Claims 1 to 4, characterized in that the supporting apparatus (20) is formed by a hydraulic supporting cylinder device (21).
6. Industrial truck according to Claim 5, characterized in that a common hydraulic energy source is provided for loading the pushing-out cylinder device (16) and the supporting cylinder device (21).
7. Industrial truck according to one of Claims 4 to 6, characterized in that the pushing-out cylinder device (16) has a pressure space (16b) which acts in the direction of the changing position and a pressure space (16a) which acts in the direction of the operating position, and the supporting cylinder device (21) is configured as a single-action cylinder which has a pressure space (21a) which acts in the direction of the supporting position, that pressure space (21a) of the supporting cylinder device (21) which acts in the direction of the supporting position being connected to that pressure space (16b) of the pushing-out cylinder device (16) which acts in the direction of the changing position.
8. Industrial truck according to Claim 7, characterized in that the supporting cylinder device (21) is loaded in the direction of a release position by means of a spring device (25).
9. Industrial truck according to one of Claims 4 to 6, characterized in that the pushing-out cylinder device (16) has a pressure space (16b) which acts in the direction of the changing position and a pressure space (16a) which acts in the direction of the operating position, and the supporting cylinder device (21) is configured as a double-action cylinder which has a pressure space (21a) which acts in the direction of the supporting position and a pressure space (21b) which acts in the direction of the release position, that pressure space (21a) of the supporting cylinder device (21) which acts in the direction of the supporting position being connected to that pressure space (16b) of the pushing-out cylinder device (16) which acts in the direction of the changing position, and that pressure space (21b) of the supporting cylinder device (21) which acts in the direction of the release position being connected to that pressure space (16a) of the pushing-out cylinder device (16) which acts in the direction of the operating position.
10. Industrial truck according to one of Claims 7 to 9, characterized in that that pressure space (21a) of the supporting cylinder device (21) which acts in the direction of the supporting position is assigned a shut-off valve (70) which can be opened in a controlled manner.
11. Industrial truck according to one of Claims 1 to 10, characterized in that a logic circuit (50) is provided which is configured in such a way that, in order to extend the displacement carriage (9) from the operating position into the changing position, locking of the vehicle body (5) is achieved in a first step by an actuation of the supporting apparatus (20) into a supporting position and, after the supporting position of the supporting apparatus (20) is reached, the extension of the displacement carriage (9) from the operating position into the changing position is achieved in a second step by an actuation of the drive device (15), and, in order to retract the displacement carriage (9) from the changing position into the operating position, the retraction of the displacement carriage (9) from the changing position into the operating position is achieved in a first step by an actuation of the drive device (15) and, after the operating position of the displacement carriage (9) is reached, unlocking of the vehicle body (5) is achieved in a second step by an actuation of the supporting apparatus (20) into a release position.
12. Industrial truck according to Claim 11, characterized in that the logic circuit (50) comprises a connecting device (51) which is assigned to that pressure space (16b) of the pushing-out cylinder device (16) which acts in the direction of the changing position and is connected on the inlet side to that pressure space (21a) of the supporting cylinder device (21) which acts in the direction of the supporting position.
13. Industrial truck according to Claim 12, characterized in that the connecting device (51) is provided with a bypass connection (55), a shut-off valve (56; 106) which opens in the outflow direction being arranged in the bypass connection (55; 105).
14. Industrial truck according to Claim 12 or 13, characterized in that the logic circuit (50) comprises a further connecting device (61), by means of which the shut-off valve (70) which can be released and is assigned to that pressure space (21a) of the supporting cylinder device (21) which acts in the direction of the supporting position can be opened in a controlled manner, the further connecting device (61) being connected on the inlet side to that pressure space (16a) of the pushing-out cylinder device (16) which acts in the direction of the operating position.
15. Industrial truck according to Claim 14, characterized in that the further connecting device (61) controls the connection to that pressure space (21b) of the supporting cylinder device (21) which acts in the direction of the release position and is provided with a bypass connection (65; 115), a shut-off valve (66; 116) which opens in the outflow direction being arranged in the bypass connection (65).
16. Industrial truck according to one of Claims 12 to 15, characterized in that the logic circuit (50) is configured as a hydraulic valve device, the connecting device (51) and/or the further connecting device (61) being formed by in each case one pressure connecting valve (52; 62), in particular a pressure limiting valve.
17. Industrial truck according to one of Claims 12 to 15, characterized in that the logic circuit (50) is configured as an electronic controller (100), the connecting device (51) and/or the further connecting device (61) being configured by in each case one electrically actuated control valve (101; 111) with a shut-off position (101a; 111a and a throughflow position (101b; 111b), it being possible for the control valves (101; 111) to be actuated by means of the electronic controller (100).
18. Industrial truck according to Claim 17, characterized in that the shut-off position (101a; 111a) of the control valve (101; 111) is provided with a bypass connection (105; 115), in which a shut-off valve (106; 116) which opens in the outflow direction is arranged.
19. Industrial truck according to Claim 17 or 18, characterized in that the electronic controller (100) has a sensor device (120) which detects the operating position and the changing position and a sensor device (125) which detects the release position and the supporting position of the supporting cylinder device (20).
20. Industrial truck according to one of Claims 5 to 19, characterized in that that pressure space (21a) of the supporting cylinder device (21) which acts in the direction of the supporting position is assigned a supporting-force limiting device (80).
21. Industrial truck according to Claim 20, characterized in that the supporting-force limiting device (80) is formed by a pressure closing valve (81), in particular a pressure control valve.
22. Industrial truck according to Claim 20 or 21, characterized in that the supporting-force limiting device (80) is provided with a bypass connection (85), a shut-off valve (86) which opens in the outflow direction being arranged in the bypass connection (85).
23. Industrial truck according to one of Claims 1 to 22, characterized in that the supporting apparatus (20) is assigned a sensor device (91) which detects the release position and is operatively connected to a vehicle controller (92) of the industrial truck.
24. Industrial truck according to one of Claims 4 to 23, characterized in that a control valve device (35) which is connected to the hydraulic energy source and a container (33) and is provided with a pushing-out switching position (35b) and a retraction switching position (35a) is provided in order to control the pushing-out cylinder device (16) and the supporting cylinder device (21).
25. Industrial truck according to Claim 24, characterized in that, in the pushing-out switching position (35b), the control valve device (35) connects that pressure space (21a) of the supporting cylinder device (20) which acts in the direction of the supporting position and the connecting device (51) to a delivery line (34) of the energy source, and connects the further connecting device (61) and that pressure space (16a) of the pushing-out cylinder device (16) which acts in the direction of the operating position to a container (33).
26. Industrial truck according to Claim 24 or 25, characterized in that, in the retraction switching position (35a), the control valve device (35) connects the further connecting device (61) and that pressure space (16a) of the pushing-out cylinder device (16) which acts in the direction of the operating position to a delivery line (34) of the energy source, and connects that pressure space (21a) of the supporting cylinder device (21) which acts in the direction of the supporting position and the connecting valve device (60) to a container.
27. Industrial truck according to one of Claims 24 to 26, characterized in that a shut-off valve (39) which opens in the direction of the control valve device (35) is arranged in the delivery line (34) which is routed from the energy source to the control valve device (35).
28. Industrial truck according to one of Claims 24 to 27, characterized in that the delivery line (34) is assigned a pressure limiting device (40).
29. Industrial truck according to one of Claims 6 to 28, characterized in that the hydraulic energy source is formed by a compact hydraulic unit (30).
30. Industrial truck according to one of Claims 6 to 28, characterized in that the hydraulic energy source is formed by working hydraulics of the industrial truck.
31. Industrial truck according to one of Claims 6 to 28, characterized in that the hydraulic energy source is formed by a pressure-medium accumulator, in particular a pressure accumulator.

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