DE102013019688B4 - Transport system with vehicle for transporting a load handling device - Google Patents

Abstract

Transport system with a vehicle (1) for transporting a load handling device, the vehicle (1) having a retractable and extendable lifting unit, a first conveyor unit being arranged in the lifting unit, the vehicle (1) having a second conveyor unit, the conveying direction of the first conveyor unit, the second conveyor unit and the retraction and extension directions are aligned in parallel, characterized in that a telescoping unit (23) has a second lifting means (80) at its first end area, with which a support part (81) towards the ground to support the first end area can be lowered on the ground, with the other end area of the telescoping unit (23) being held on the frame (20) of the vehicle (1) via a first lifting means (22), the first end area on the side facing away from the first lifting means (22). the telescoping unit (23) is arranged, the lifting unit having a support part (25), a receiving part (26) and a lifting means (60) for Adjusting the height of the receiving part (26), the lifting means (60) being arranged between the support part (25) and the receiving part (26), wheels (24) being arranged on the support part (25).

Description

The invention relates to a transport system with a vehicle for transporting a load handling device.

It is generally known that vehicles are used in transport systems for transporting a load-carrying means, such as a Euro pallet, a lattice box or another loading aid or another load carrier.

In the present document, wheels also include rollers.

From the DE 30 17 456 A1 a high rack stacker is known as the closest prior art, which has the features of the preamble.

From the U.S.A. 4,813,526 a mobile conveyor unit is known.

From the DE 25 12 200 A1 a transport vehicle with a lifting platform is known.

The invention is therefore based on the object of further developing a vehicle, in which case effective intralogistic transport is to be made possible.

According to the invention, the object is achieved with the transport system according to the features specified in claim 1.

Important features of the invention in the transport system with vehicle, in particular for transporting a load handling device, are that the vehicle has a retractable and/or extendable lifting unit, in particular a floor-level lifting unit,
wherein a first conveyor unit is arranged in the lifting unit, in particular is arranged integrated,
wherein the vehicle has a second conveyor unit,
In particular, the conveying direction of the first conveying unit, the second conveying unit and the entry direction and exit direction are aligned in parallel.

The advantage here is that an effective intralogistic transport is made possible. Because the vehicle can be used to pick up a load handling device, such as a Euro pallet, with the lifting unit and transfer it to a transport vehicle. Thus, the vehicle can be optimized for picking up and handing over and the transport vehicle for transport. The lifting unit can be moved into a channel that is open at the bottom, and the load handling device can thus be lifted.

According to the invention, the vehicle has a telescoping unit that can be adjusted in height by means of a first lifting device,
in particular wherein the telescoping unit is aligned parallel to the conveying direction of the first conveying unit, the second conveying unit and/or the retracting direction and/or the extending direction of the lifting unit. The advantage here is that the telescoping unit can be moved into a continuous channel of the load handling unit so that it can be lifted. After the lifting carried out in this way, it is possible for the respective lifting unit to drive under the load handling unit. It is thus possible for the lifting unit to drive under the load-carrying unit after the load-carrying unit has been jacked up by the telescoping unit.

In an advantageous embodiment, the first lifting means is arranged on the frame of the vehicle, in particular suspended, with the lifting means holding the telescoping unit. The advantage here is that the height of the telescoping unit can be adjusted in such a way that it can be moved into the other channels of the load handling unit, which are not continuously open at the bottom.

According to the invention, the telescoping unit has a second lifting means on its first end area, with which a support part can be lowered towards the ground, in particular for supporting the first end area on the ground,
wherein the other end area of the telescoping unit is held on the frame of the vehicle via the first lifting means,
wherein the first end area is arranged on the side of the telescoping unit facing away from the first lifting means. The advantage here is that the load handling unit can be lifted without the risk of tipping over. On the one hand, the telescoping unit is suspended from the frame of the vehicle via the first lifting means and is thus able to dissipate force. On the other hand, a further force dissipation is additionally made possible via the support with the second lifting means. Thus, the center of gravity of the load handling unit is arranged between the first lifting means of the telescoping unit and the second lifting means, thus preventing the vehicle from tipping over.

According to the invention, the lifting unit has a support part, a receiving part and a lifting device for adjusting the height of the receiving part.
wherein the lifting means is arranged between the support part and the receiving part,
wheels being arranged on the support part, in particular for retracting or extending the lifting unit on the travel plane and/or on the floor,
in particular, the first conveyor unit, in particular chain conveyor unit, being arranged in the receiving part, in particular being arranged in an integrated manner. The advantage here is that after driving into the downwardly open channels of the load handling unit or after driving under the load handling unit, the load handling unit can be lifted by means of the lifting means.

In an advantageous embodiment, a threading section is formed or arranged on the frame of the vehicle between the first conveyor unit and the second conveyor unit. The advantage here is that a gentle transfer of the load-carrying means from the first conveyor unit to the second conveyor unit is made possible.

In an advantageous embodiment, the load handling device has first and second channels, in particular recesses,
wherein the first channels extend in a first direction, in particular through the load handling device,
wherein the second channels extend in a second direction, in particular through the load handling device, wherein the first and second directions are aligned perpendicular to one another and are each aligned parallel to the travel plane in which the vehicle can be moved,
wherein the first channels are open towards the surface, in particular are designed as indentations and/or as channels or indentations open towards the bottom
wherein the second channels are not fully or uninterruptedly open to the surface,
wherein the first and second channels have a common spatial area, in particular as an intersection, in particular such that the common spatial area is open to the surface. The advantage here is that the load-carrying means has different types of channels, so that picking up with the lifting unit or jacking up with the telescopic unit and subsequent picking up with the lifting unit is optionally possible. Since the direction of the first channels, which are open at the bottom, is aligned perpendicular to the direction of the second channels, which are not continuously open at the bottom but are continuous, a longitudinal exposure and, optionally, a transverse exposure can be carried out.

In an advantageous embodiment, the second conveyor unit is designed as a chain conveyor unit whose conveyor chain, i.e. chain, drives the retraction and/or extension of the lifting unit and/or the height adjustment of the lifting unit, in particular with the receiving part of the lifting unit being positively locked, in particular latched, to a chain link of the conveyor chain , Is connected, in particular at least up to a respective end position. The advantage here is that only a single drive motor is necessary, since the running and the height adjustment can be actuated via a chain.

Alternatively, a first conveyor chain is provided for transferring the load to the transport vehicle and a second chain which retracts, extends, raises or lowers the lifting unit. In this way, the receiving part can be firmly connected to a chain link and no complex locking/unlocking mechanism has to be developed.

In an advantageous embodiment, a horizontal guide rail and a vertical guide rail are arranged along the chain for guiding the receiving part of the lifting unit. The advantage here is that the horizontal guide rail guides the extension of the lifting unit and the vertical guide rail guides the height adjustment of the lifting unit. Thus, the two movements are necessarily executed one after the other.

In an advantageous embodiment, the transport system has a transport vehicle whose largest drive wheels have a larger diameter than the diameter of the largest drive wheels of the vehicle.
in particular wherein the transport vehicle has a conveying unit that is in particular height-adjustable. The advantage here is that the vehicle can be optimized for picking up and handing over, but may have a slower and/or weaker traction drive and the transport vehicle may have a faster and/or stronger traction drive. Thus, overall, effective and rapid unloading of a truck is made possible when a plurality of load handling units are arranged on the truck. In particular, effective and fast loading, ie loading or unloading, of goods stored on the floor is possible, such as loading or unloading a truck at the loading ramp with Euro pallets.

In an advantageous embodiment, the telescoping unit has a toothed rack for extending and/or retracting it,
in particular, a gear wheel driven by an electric motor being in mesh with the toothed rack. The advantage here is that a simple drive of the telescoping unit is made possible.

Further advantages result from the dependent claims. The invention is not limited to the combination of features of the claims. For the person skilled in the art, there are further meaningful combinations of claims and/or individual claim features and/or features of the description and/or the figures, in particular from the task and/or the task arising from comparison with the prior art.

• In der 1 ist ein erfindungsgemäßes Transportsystem gezeigt mit einem Fahrzeug 1, das in einem Lastkraftwagen 2 oder an einem Bodenstellplatz angeordnete Europaletten 90 aufnimmt und übergibt an ein Transportfahrzeug 3, welches die jeweilige Europalette 90 samt dem darauf vorgesehenen Fördergut 94 an stationäre Lastübergabestationen 4, wie Rollenfördereinheit 5, Abstellbock 6, Hochregallagereingang 7 oder Bearbeitungsmaschine 8.
• In der 2 ist das Fahrzeug 1 in Schrägansicht gezeigt, wobei das Fahrzeug 1 eine Teleskopiereinheit 23 als Aufbockeinheit aufweist und eine Hubeinheit.
• In der 3 ist schematisch skizziert, wie die Hubeinheit mit einer einzigen Kette 27 zunächst horizontal verfahrbar ist.
• In der 4 ist schematisch skizziert, wie die Höhenverstellung der Hubeinheit danach mittels der Kette 27 antreibbar ist.
• In der 5 ist der Kettenantrieb der Hubeinheiten in Schrägansicht dargestellt, wobei die Hubeinheit im Bereich des horizontalen Verfahrens gemäß 3 gezeigt ist.
• In der 6 ist der Kettenantrieb der Hubeinheiten in Schrägansicht dargestellt, wobei die Höhenverstellung der Hubeinheit gemäß 4 gezeigt ist.
• In der 7 ist die noch eingezogene Teleskopiereinheit 23 samt ihrem Antrieb dargestellt.
• In der 8 ist die ausgefahrene Teleskopiereinheit 23 dargestellt, wobei auch die höhenverstellbare Abstützung gezeigt ist.
• In der 9 ist das Fahrzeug 1 mit ausgefahrener Hubeinheit gezeigt, wobei die Europalette 90 an ein Transportfahrzeug 3 übergeben wird. Hierzu sind die 10 bis 14 erläuternde Figuren.
• In der 10 ist das Fahrzeug 1 positioniert neben einer Europalette 90, wobei ein Transportfahrzeug 3 auf der von der Europalette 90 abgewandten Seite positioniert ist.
• In der 11 wird die Hubeinheit in einen nach unten, also zum Boden hin, offenen Längskanal der Europalette 90 eingefahren.
• In der 12 wird die Hubeinheit höhenverstellt, also die Europalette 90 gehoben und zum Transportfahrzeug 3 gefördert.
• In der 13 ist die Übergabe der Europalette 90 an das Transportfahrzeug 3 gezeigt.
• In der 14 ist die Übergabe beendet.
• In der 15 ist die Aufnahme einer Europalette 90 in Querrichtung gezeigt. Hierzu sind die 16 bis 26 erläuternde Figuren.
• In der 16 ist das Fahrzeug 1 wiederum positioniert neben einer Europalette 90, wobei ein Transportfahrzeug 3 auf der von der Europalette 90 abgewandten Seite positioniert ist.
• In der 17 wird das Absenken der Teleskopiereinheit 23 gezeigt.
• In der 18 wird die Teleskopiereinheit 23 in einen Querkanal der Europalette 90 eingefahren.
• In der 19 wird die Abstützung der Telekopiereinheit höhenverstellt, also am Boden abgestützt, und durch Höhenverstellung der Abstützung und Höhenverstellung der Teleskopiereinheit 23 die Europalette 90 angehoben.
• In der 20 ist die auf diese Art und Weise angehobene Europalette 90 gezeigt.
• In der 21 wird das Ausfahren der Hubeinheit zum Unterfahren und nachfolgende Aufnehmen der Europalette 90 dargestellt.
• In der 22 wird das Einfahren der Abstützung der Teleskopiereinheit 23 dargestellt.
• In der 23 ist die Teleskopiereinheit 23 eingefahren.
• In der 24 wird die Hubeinheit höhenverstellt, so dass die Europalette 90 angehoben wird.
• In der 25 ist die Europalette 90 an das Fahrzeug 1 übergeben.
• In der 26 ist die Europalette 90 an das Transportfahrzeug 3 übergeben.

The invention will now be explained in more detail with reference to figures:

• In the 1 a transport system according to the invention is shown with a vehicle 1, which picks up Euro pallets 90 arranged in a truck 2 or at a ground parking space and transfers them to a transport vehicle 3, which transports the respective Euro pallet 90 together with the conveyed goods 94 provided on it to stationary load transfer stations 4, such as roller conveyor unit 5, storage stand 6, high-bay warehouse entrance 7 or processing machine 8.
• In the 2 the vehicle 1 is shown in an oblique view, the vehicle 1 having a telescoping unit 23 as a jacking unit and a lifting unit.
• In the 3 is a schematic sketch of how the lifting unit can initially be moved horizontally with a single chain 27 .
• In the 4 is schematically sketched how the height adjustment of the lifting unit can then be driven by means of the chain 27.
• In the 5 the chain drive of the lifting units is shown in an oblique view, with the lifting unit in the area of the horizontal method according to 3 is shown.
• In the 6 the chain drive of the lifting units is shown in an oblique view, with the height adjustment of the lifting unit according to 4 is shown.
• In the 7 the telescoping unit 23, which is still retracted, is shown together with its drive.
• In the 8th the extended telescoping unit 23 is shown, with the height-adjustable support also being shown.
• In the 9 the vehicle 1 is shown with the lifting unit extended, with the Euro pallet 90 being transferred to a transport vehicle 3 . For this are the 10 until 14 explanatory figures.
• In the 10 the vehicle 1 is positioned next to a Euro pallet 90, with a transport vehicle 3 being positioned on the side facing away from the Euro pallet 90.
• In the 11 the lifting unit is moved into a longitudinal channel of the Euro pallet 90 which is open downwards, ie towards the floor.
• In the 12 the lifting unit is adjusted in height, ie the Euro pallet 90 is lifted and conveyed to the transport vehicle 3.
• In the 13 the transfer of the Euro pallet 90 to the transport vehicle 3 is shown.
• In the 14 the transfer is complete.
• In the 15 the recording of a Euro pallet 90 is shown in the transverse direction. For this are the 16 until 26 explanatory figures.
• In the 16 the vehicle 1 is again positioned next to a Euro pallet 90, with a transport vehicle 3 being positioned on the side facing away from the Euro pallet 90.
• In the 17 the lowering of the telescoping unit 23 is shown.
• In the 18 the telescoping unit 23 is moved into a transverse channel of the Euro pallet 90.
• In the 19 the support of the telescoping unit is height-adjusted, ie supported on the ground, and the Euro pallet 90 is raised by adjusting the height of the support and height adjustment of the telescoping unit 23 .
• In the 20 the Euro pallet 90 raised in this way is shown.
• In the 21 the extension of the lifting unit for driving under and subsequent picking up of the Euro pallet 90 is shown.
• In the 22 the retraction of the support of the telescoping unit 23 is shown.
• In the 23 the telescoping unit 23 is retracted.
• In the 24 the lifting unit is adjusted in height so that the Euro pallet 90 is raised.
• In the 25 the Euro pallet 90 is handed over to the vehicle 1.
• In the 26 the Euro pallet 90 is handed over to the transport vehicle 3.

As in 1 shown, the transport system according to the invention requires two types of vehicles, namely vehicle 1, which is optimized for receiving the Euro pallet 90, and transport vehicle 3, which is optimized for transporting the Euro pallet 90 to the distant destination.

According to the invention, the vehicle 1 only has to be moved without a load. Because when the load is picked up, the vehicle 1 does not move. Vehicle 1 therefore requires smaller wheels 21 and less traction drive power than transport vehicle 3, which therefore has a greater maximum achievable speed than vehicle 1.

The transport vehicle 3 has wheels 92 with which it can be moved in the travel plane. It also has a not shown Lifting means 151, with which a conveyor unit is adjustable in height. The conveyor unit is designed either as a roller conveyor unit 93 or as a chain conveyor unit 150.

In the 2 the vehicle 1 is shown in more detail. Wheels 21, in particular steerable drive wheels or drive wheels and steering wheels, are mounted and/or arranged on the frame 20.

The vehicle 1 can thus be moved in the travel plane—however, without a load and only at a low speed.

A lifting unit is arranged on the vehicle 1 and can be moved into a channel of the Euro pallet 90 which is open at the bottom. The movement of the lifting unit and also the height adjustment of the lifting unit can be driven by means of the chain 27 . The lifting unit has a support part 25 on which wheels 24 are rotatably mounted and/or arranged. A lifting device 60, in particular a scissor lifting device, such as a scissor lifting table, is arranged on the support part 25, so that a receiving part 26 can be lifted. The receiving part 26 is shaped like a fork arm, ie essentially plate-shaped.

The Euro pallet 90 picked up by the lifting unit can be conveyed by a conveyor unit arranged integrated in the lifting unit, in particular a chain conveyor unit with chain 52 , and can be transferred to the chain conveyor unit with chain 27 via the sloping threading section 28 . After the transfer, the chain conveyor unit promotes the Euro pallet 90 to the transport vehicle 3 .

The vehicle 1 also has a telescoping unit 23, which is attached to a lifting device 22, in particular a scissor lifting device, such as a scissor lifting table, with the lifting device 22 being connected to the frame 20 on its side facing away from the telescoping unit 23, in particular being arranged suspended therefrom. The lifting means 22 is driven by an electric motor 29 .

Lifting unit and telescoping unit 23 and their associated drives are duplicated and each arranged parallel to one another in order to ensure stable loading of the Euro pallet 90 .

As in the 3 until 6 shown, the chain 27 is driven by a chain drive 51,

The receiving part 26 is connected to one of the chain links of the chain 27 by a latching element 30 arranged on its first end region, in particular in the longitudinal direction.

The chain 27 runs through a horizontal and a vertical area. Thus, the receiving part 26 is first guided horizontally on guide rails and vertically in the vertical region of guide rails 50 . For this purpose, the receiving part 26 has corresponding horizontally extending and vertically extending guide sections. The lifting unit is moved horizontally by moving the end area connected to the chain link in the horizontal direction. By moving the end area connected to the chain link in the vertical direction, the height of the lifting unit is adjusted vertically and the Euro pallet 90 that has been picked up is thus lifted.

A chain conveyor unit with a chain 52 is integrated in the center of the receiving part 26 . The Euro pallet 90 that has been picked up can thus be loaded onto the conveyor unit with chain 27 via the threading section 28.

After the receiving part 26 has reached its highest position, the latching element 30 disengages as the chain 27 moves further. When the direction of the chain 27 reverses, the latching element 30 engages again and the lifting means 22 is thus retracted and the lifting unit is then moved horizontally.

The chain 52 has a separate drive.

As in 7 shown in more detail, the lifting means 22 has a motor 29 which drives a spindle 70 which is operatively connected to a spindle nut 71 so that a linear drive is provided for driving the scissors lifting means, in particular the scissors of the scissors lifting means.

The telescoping unit 23 has a toothed rack 73 so that the telescoping unit 23 can be extended or retracted with a drive 72 . A geared motor with a chain wheel that drives the toothed rack 73 and is driven by the geared motor can be provided as the drive 72 .

At its end region facing away from the lifting means 22 , the telescoping unit 23 has a support part 81 that can be moved via the lifting means 80 as a height-adjustable support.

The lifting unit, in particular the support part 25, receiving part 26 and lifting means 60, is designed so narrow that the lifting unit can be moved into a channel of the Euro pallet 90 which is open at the bottom, ie towards the floor. When retracting, the lifting unit moves on the floor, i.e. on the same level on which the Euro pallet 90 is parked.

The lifting unit has these downwardly open channels in the longitudinal direction. The longitudinal direction is aligned parallel to the traversing plane. In the transverse direction, i.e. perpendicular to the longitudinal direction and parallel to the travel plane, the Euro pallet has 90 channels that are not completely open at the bottom. Therefore, for jacking up, first the telescoping unit 23 is moved into these channels extending in the transverse direction and then the Euro pallet 90 is lifted. In this case, use is made of the fact that the channels intersect the channels extending in the longitudinal direction and thus a respective spatial area is present in the respective intersection area, in which there is an opening downwards and thus the support can be supported on the ground. For this purpose, the support part 81 is lowered to the ground with the lifting means 80 in the area where the channels intersect.

The lifting unit and the telescoping unit 23 are spaced apart from one another perpendicularly to the conveying direction of the conveying units of the vehicle 1, in particular with this spacing direction being aligned parallel to the travel plane.

In this way, after the telescoping unit 23 has been retracted into the channels extending in the transverse direction and after the support has been lowered and the support part 81 has touched the ground, the lifting means 80 can be moved under the Euro pallet 90 without colliding with the support. The lifting means 80 is therefore always within the travel plane at a distance from the telescoping unit 23.

On the Euro pallet 90 is a conveyed item 94 , in particular a load part, provided whose mass exceeds the mass of the Euro pallet 90 and also of the vehicle 1 . Nevertheless, the Euro pallet 90 can be accommodated without the vehicle 1 tipping over. Because the load is lifted from below.

The transport vehicle 3 has lifting means (91, 151), in particular scissor lifting means, such as a scissor lift table, by means of which the roller conveyor unit 93 arranged on the transport vehicle 3, which conveys in the longitudinal direction, or, in an alternative embodiment of the transport vehicle 3, the chain conveyor unit arranged on the transport vehicle 3 150, which promotes in the transverse direction to the direction of travel of the transport vehicle 3, is adjustable in height.

In a further exemplary embodiment according to the invention, linear actuators or hydraulic or pneumatic lifting devices are used as lifting means.

Reference List

1

vehicle

2

truck

3

Transport vehicle with height-adjustable conveyor unit

4

stationary load transfer stations

5

roller conveyor unit

6

stand

7

High bay warehouse entrance

8th

processing machine

20

frame

21

Wheel, in particular steerable drive wheel

22

Lifting means, in particular scissor lifting means, such as scissor lifting table

23

telescopic unit

24

wheel, especially roller

25

support part

26

recording part

27

Chain

28

threading section

29

electric motor

30

snap element

50

guide rail

51

chain drive

52

Chain

60

Lifting means, in particular scissor lifting means, such as scissor lifting table

70

spindle

71

spindle nut

72

drive

73

rack

80

Lifting means, in particular scissor lifting means, such as scissor lifting table

81

support part

90

Euro pallet

91

Lifting means, in particular scissor lifting means, such as scissor lifting table

92

wheel

93

roller conveyor unit

94

Goods to be conveyed, especially load part

150

Chain conveyor unit, in particular in the transverse direction to the direction of travel

151

Lifting means, in particular scissor lifting means, such as scissor lifting table

Claims (10)

Transport system with a vehicle (1) for transporting a load handling device, the vehicle (1) having a retractable and extendable lifting unit, a first conveyor unit being arranged in the lifting unit, the vehicle (1) having a second conveyor unit, the conveying direction of the first conveyor unit, the second conveyor unit and the retraction and extension directions are aligned in parallel, characterized in that a telescoping unit (23) has a second lifting means (80) at its first end region, with which a support part (81) towards the ground to support the first end area can be lowered to the ground, with the other end area of the telescoping unit (23) being held on the frame (20) of the vehicle (1) via a first lifting means (22), the first end area being on the side facing away from the first lifting means (22). Side of the telescoping unit (23) is arranged, the lifting unit having a support part (25), a receiving part (26) and a lifting center l (60) for adjusting the height of the receiving part (26), the lifting means (60) being arranged between the supporting part (25) and the receiving part (26), wheels (24) being arranged on the supporting part (25). transport system claim 1 , characterized in that the telescoping unit (23) can be adjusted in height by means of a first lifting means (22), in particular with the telescoping unit (23) being aligned parallel to the conveying direction of the first conveying unit, the second conveying unit and/or the retracting direction and/or the extending direction of the lifting unit . transport system claim 2 , characterized in that the first lifting means (22) is arranged on the frame (20) of the vehicle (1), in particular is suspended, the lifting means (22) holding the telescoping unit (23). Transport system according to at least one of the preceding claims, characterized in that the first conveyor unit, in particular chain conveyor unit (150), is arranged in the receiving part (26), in particular is arranged integrated. Transport system according to at least one of the preceding claims, characterized in that a threading section (28) is formed or arranged on the frame (20) of the vehicle (1) between the first conveyor unit and the second conveyor unit for gently transferring a load handling device from the first conveyor unit to the second conveyor unit. Transport system according to at least one of the preceding claims, characterized in that the load-carrying means (90) has first and second channels, in particular recesses, the first channels extending in a first direction, in particular through the load-carrying means (90), the second Channels extend in a second direction, in particular through the load handling device (90), the first and second directions being aligned perpendicular to one another and each being aligned parallel to the travel plane in which the vehicle (1) can be moved, the first channels to the are open on the surface, in particular are designed as indentations and/or as channels or indentations open towards the bottom, with the second channels not being completely or continuously open towards the surface, with the first and second channels having a common spatial area, in particular as an intersection , especially so that the ge common area of space is open to the surface. Transport system according to at least one of the preceding claims, characterized in that the second conveyor unit is designed as a chain conveyor unit (150), whose conveyor chain (27) drives the retraction and/or extension of the lifting unit and/or the height adjustment of the lifting unit, in particular the receiving part (26) of the lifting unit is positively connected, in particular latched, to a chain link of the conveyor chain (27), in particular at least up to a respective end position. transport system claim 7 , characterized in that a horizontal guide rail (50) and a vertical guide rail (50) are arranged along the conveyor chain (27) for guiding the receiving part (26) of the lifting unit. Transport system according to at least one of the preceding claims, characterized in that the transport system has a transport vehicle (3) whose largest drive wheels (92) have a larger diameter than the diameter of the largest drive wheels (21) of the vehicle (1), in particular wherein the Transport vehicle (3) has a height-adjustable conveyor unit. Transport system according to at least one of the preceding claims, characterized in that for extending and/or retracting the telescoping unit (23), it has a toothed rack (73), in particular a gear wheel driven by a drive (72) meshing with the toothed rack (73 ).

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