TRAILER LIFTING DEVICE AND TRAILER WITH A LIFTING DEVICE

Abstract

The invention relates to a lifting device (10) for a trailer of the haulage train (1) for raising and lowering cargo transported in the trailer of the haulage train (1). The lifting device (10) has a lifting shaft (21) that is driven by a drive motor (20) and is rotatably mounted on a bearing around a pivot axis (D), to which a lifting linkage (25a, 25b; 25c; 25d) is articulated, raising and lowering the load spaced from the pivot axis (D) of the lifting shaft (21).

Description

TRAILER LIFTING DEVICE AND TRAILER WITH A LIFTING DEVICE Field of Invention The invention relates to a lifting device for a haul train trailer to raise and lower a load carried in the haul train trailer. The invention also relates to a towing train trailer with a chassis and a lifting device. Background of the Invention For internal transport of loads, for example, in the production area of ​​manufacturing plants, trailer trains are increasingly used, which consist of a trailer vehicle, for example, a tractor, and a plurality of trailer train accessories attached to the tractor, in which the loads are transported. Document DE 10 2014 100 865 Al discloses a freight train trailer with a chassis, including a front axle module and a rear axle module. The front axle module and the rear axle module each comprise a mast profile of Ref. 336531 QPfrAnn / zznz / E / YiAi lifting, in which a load-receiving transport device is arranged to be raised and lowered. For this purpose, the transport device is provided with a first coupling section, by which the transport device is guided vertically in the profile of the lifting mast of the front axle module, and with a second coupling section by which the transport device is guided vertically in the profile of the lifting mast of the rear axle module. A lifting device is provided for raising and lowering the transport device relative to the axial modules of the chassis, which, in the region of each coupling section of the transport device, comprises a lifting unit.The lifting units are designed as either electrically driven screw conveyors or electro-hydraulically driven lifting cylinders, the base of which is fixed in each case to the corresponding coupling section of the transport device. The lifting unit elements that can extend vertically downwards are supported by the designated front axial module or rear axle module. In the case of the towing of the traction train known by document DE 10 2014 100 865 Al, the QQfrAnn / zznz / E / YiAi lifting device for raising and lowering the transport device and thus for raising and lowering the transported load includes a lifting device made as an electric threaded spindle or as electro-hydraulically driven lifting cylinders between the transport device and the front axle module and another lifting unit made as an electric threaded spindle or as electro-hydraulically driven lifting cylinders between the transport device and the rear axle module, so that the lifting device has several electric threaded spindles or electro-hydraulically driven lifting cylinders. When lifting a load transported in a trailer using a lifting device comprising several electric screw conveyors, as described in document DE 10 2014 100 865 A1, the screw conveyors must operate synchronously to lift a load such as a load carrier, trolley, pallet, or lattice box. Furthermore, all screw conveyors must be monitored by appropriate sensors to track the lifting device and detect its lifting status, since a screw failure could disrupt the lifting process. QPfrAnn / zznz / E / YiAi threading, there is a risk of load loss or damage to the lifting device. At the extreme upper position of the raised transport device, the electric drive motors of the electric threading spindles are not yet load-free, as the threading spindles are only partially self-locking. If an unintentional lowering of the load occurs during transport of the lifted load on the towing train trailer, the load must be re-raised, for example, by means of an electronic control device that controls the electric threading spindles. A lifting device for a towing train trailer comprising several electrically operated threaded spindles, as in document DE 10 2014 100 865 Al, therefore has the following disadvantages: • Several threaded electric spindles are required to raise and lower the load; • Synchronization of the electric threading spindles is necessary; • The electric drive motors of the electric threading spindles are unloaded in the extreme upper position; • Each electric threading spindle must be monitored individually and therefore separately by means of corresponding sensors. oofrAnn / zznz / E / YiAi Brief Description of the Invention The present invention is based on the object of providing a lifting device for a haulage train trailer and a haulage train trailer with a lifting device that avoids one or more of the aforementioned disadvantages. This problem is solved in accordance with invention 1 by means of a lifting device for a haulage train trailer to raise and lower a load carried in the haulage train trailer, wherein the lifting device has a lifting shaft driven by means of a drive motor and rotatably mounted about a pivot axis, to which at least one lifting linkage is articulated, raising and lowering the load at a distance from the pivot axis of the lifting shaft. Such a lifting device, with a lifting shaft driven by a drive motor, in which one or more lifting linkages are articulated at a distance from the axis of rotation of the lifting shaft to lift loads carried in the trailer of the towing train, forms a crank mechanism for raising and lowering loads transported in the trailer of the towing train. Only a single drive motor is required to drive the lifting shaft. QPfrAnn / zznz / E / YiAi which results in reduced construction costs for the lifting device. Several lifting linkages can be articulated on the lifting shaft, so all the lifting linkages are raised simultaneously and synchronously as the lifting shaft rotates. This also means there is no need to synchronize multiple electric drives. According to a further advantageous refinement of the invention, the lifting device has at least two lifting linkages, which are spaced apart along the longitudinal axis of the lifting axis. The corresponding lifting linkages can be easily connected to the lifting axis by articulating them, so that the lifting device can be readily adapted to the requirements of the towing train and the load to be transported by varying the number and position of the lifting linkages. According to an advantageous embodiment of the invention, the lifting linkage is articulated to a crank arm device that is rotatably fixed to the lifting shaft. The crank arm device thus forms a crank arm, which is rotatably fixed to the lifting shaft and to which the lifting linkage is articulated. QPfrAnn / zznz / E / YiAi corresponding. Therefore, with several of these crank arm devices, the lifting linkages can be easily operated by rotating the lifting shaft to raise and lower a driven load on the trailing gear attachment. According to a favorable embodiment of the invention, the crank arm device has two crank discs arranged on the lifting shaft and spaced axially, between which the lifting linkage is arranged. Such crank discs can be produced in a simple manner. With such crank discs, the crank arm device can be produced in a simple manner. If the corresponding linkage is arranged between two crank discs and is articulated to the crank discs, a favorable force flow between the linkage and the crank discs can be achieved. According to a favorable embodiment of the invention, the lifting linkage is articulated to the crank arm device with a retaining pin arranged in the crank arm device parallel to the axis of rotation of the lifting shaft, so that an articulated connection of the lifting linkage to the device is achieved with little construction expense QPfrAnn / zznz / E / YiAi of crank arm. According to a favorable embodiment of the invention, the lifting linkage is configured in the area of ​​the articulation with the lifting shaft as a hook profile. This profile is configured so that, in the uppermost position of the lifting linkage, the hook profile rests with its inner surface on the outer surface of the lifting shaft, thus supporting the linkage on the shaft. In this uppermost position, and therefore with the load raised, the lifting linkage with the corresponding hook profile can rest on and support the lifting shaft, so that in this uppermost position the drive motor of the lifting device is unloaded and, consequently, the load is lifted. The drive motor, in particular an electric drive motor, according to a favorable embodiment of the invention, is actively connected to the lifting shaft for its operation by means of a gearbox, in particular a drive gear. This allows for simple operation. QPfrAnn / zznz / E / YiAi position the drive motor laterally next to the lifting shaft. Furthermore, the gearbox allows for a reduction ratio that enables the use of a smaller drive motor. The drive gear can be designed as a chain drive or a belt drive, such as a toothed belt drive. Special advantages can be achieved if, according to an improvement of the invention, a dead-stop lock is configured between the lifting linkage and the lifting shaft in the upper extreme position. This easily prevents the load lifted onto the moving trailer from unintentionally lowering. According to an advantageous embodiment of the invention, the lifting shaft is formed as a splined shaft or a toothed shaft. On such a lifting shaft, any number of crank arm devices can be easily arranged and positioned at will along the longitudinal axis of the lifting shaft to adapt the lifting device to the requirements of the towing train and the load to be transported. The crank arm device is advantageously provided with a hub profile that interacts in a complementary manner with the splined or toothed shaft. With such a hub profile, the The QPfrRnn / zznz / E / YiAi crank arm device can be easily arranged rotatably fixed on the lifting shaft. According to an advantageous embodiment of the invention, the lifting shaft is provided with a mechanical interface, with which a hand tool is QPfrAnn / zznz / E / YiAi can be actively connected for manual operation of the lifting shaft. Therefore, in the event of a drive motor failure, the lifting shaft can be easily operated manually using a hand tool that fits, for example, into the lifting shaft interface, allowing the load to be raised and lowered manually. The hand tool could be, for example, a lever. The task is also solved by means of a trailer of the drag train with a chassis having two axial modules arranged spaced in the longitudinal direction of the vehicle, between which the transported load is placed, and which is provided with a lifting device in accordance with the invention. According to an advantageous embodiment of the invention, the trailer of the haulage train has a bridge-type frame connecting the axial modules. This frame comprises vertical columns arranged on the axial modules and a beam connecting the vertical columns. The lifting shaft of the lifting device is rotatably mounted on the beam. The lifting shaft is preferably arranged longitudinally along the beam. The bridge-type frame connects and spans the two axial modules between which the transported load is positioned. The lifting shaft can be simply and conveniently rotatably mounted on the beam of the bridge-type frame, allowing the load to be easily raised and lowered using lifting links articulated to the lifting shaft. In the trailer of the towing train according to the invention, in one embodiment it is possible to raise and lower the load carriers arranged between the two axial modules directly with the lifting linkages, for example, by providing the lifting linkages with corresponding hooks at the end, which can hook the load carriers. According to an advantageous embodiment of the invention, the trailer of the haul train has a transport device for receiving the load, the transport device being disposed between the axial modules and, by means of the lifting device, arranged to be raised and lowered in relation to the QPfrAnn / zznz / E / YiAi axial modules, whereby the lifting linkage of the lifting device is in active connection with the transport device. The load is therefore received by the transport device, which can be raised and lowered by means of the lifting device. The transport device is advantageously arranged in the axial modules to be raised and lowered by means of a vertical guide. With suitable vertical guides, vertical movement of the transport device in the two axial modules can be easily achieved, so that the lifting linkage only needs to transmit the lifting forces to raise the transport device. According to a favorable embodiment of the invention, the transport device has a platform for loading rolling carts that have rollers acting as load carriers, the rolling carts with rollers resting on the platform. Therefore, one or more rolling carts with their rollers can be easily loaded onto such a transport device with a platform and transported on the towing unit. With the device QPfrAnn / zznz / E / YiAi Elevation in accordance with the invention, the platform with the rolling carts located on it can be raised and lowered in a simple manner. According to an alternative and favorable embodiment of the invention, the transport device comprises several prongs for receiving the load. The prongs can easily receive pallets or lattice boxes as load carriers. The lifting device according to the invention allows for the simultaneous and easy raising and lowering of several prongs. The lifting device according to the invention and a towing train trailer with a lifting device according to the invention have a number of advantages. The lifting device according to the invention has a simple and economical structure and allows for the raising and lowering of several load carriers with a single drive motor. If the lifting shaft drives several lifting linkages, the stroke of the lifting linkages is mechanically coupled via the lifting shaft. Therefore, while several load carriers are lifted with the lifting device according to the invention, all load carriers are lifted simultaneously. QQfrAnn / zznz / E / YiAi synchronous. With the hook profile on the lifting linkages, which in the extreme upper position of the lifting linkage rests with an inner surface on the outer surface of the lifting shaft and supports the lifting linkage on the lifting shaft, the drive motor is free of load in the extreme upper position. The lifting height achievable by the lifting device can be easily adjusted by varying the swing angle of the lifting shaft. Larger lifting height variations can be achieved by simply replacing the crank arm devices and, therefore, the crank discs with other crank arms.In the event of a failure of the lifting device's drive motor, the lifting shaft can be manually operated using a hand tool connected to the lifting shaft interface, thus manually raising the load carriers. For the lifting device according to the invention, only a single sensor needs to detect the lifting shaft to determine the lifting status of the device.The lifting device according to the invention is flexibly adaptable to the number of load carriers, the loads to be lifted, the lifting height and the lifting speed, since the number of lifting linkages and the position of the lifting linkages in the longitudinal direction of the lifting shaft can be selected at will and it is possible to attach to the lifting shaft several crank arm devices with different crank arms. Brief Description of the Figures Other advantages and details of the invention are explained in greater detail based on the illustrative embodiment represented in the schematic figures. These show Figure 1 shows a trailer of the towing train according to the invention, with a lifting device according to the invention in a perspective representation, Figure 2 shows the towing train of Figure 1 in a side elevation view in a lowered position from a transport device, Figure 3 shows the towing train of Figure 2 with the transport device in the raised position, Figure 4 a section of the lifting device according to the invention, QPfrAnn / zznz / E / YiAi Figures 5aa 5d the lifting device according to the invention in various lifting positions. Detailed Description of the Invention Figures 1 to 3 depict a trailer of the drag train 1 of a drag train in accordance with the invention. The trailer of the towing train 1 has a chassis 2, which has two axial modules 2a, 2b arranged at a distance in the longitudinal direction of vehicle L. Axial module 2a is configured as a front axial module and provided with front wheels 3. Axial module 2b is configured as a rear axial module and provided with rear wheels 4. A steerable tow bar 5 is arranged on axial module 2a, by which the trailer of the traction train 1 can be coupled to a traction vehicle or to a trailer of the previous traction train. Axial module 2b is equipped with a trailer hitch 6, to which another trailer of the traction train can be coupled. The front wheels 3 and / or the rear wheels 4 can be steerable. If both the front wheel 3 and the rear wheel 4 are steerable, the steering movement of the front wheel and the movement of the rear wheel can be coupled. QPfrAnn / zznz / E / YiAi rear wheel direction. A load can be carried between axle module 2a and axle module 2b. The trailer of the traction train 1 has a transport device 7 to accommodate the load, which is arranged between the two axial modules 2a and 2b. The transport device 7 can be raised and lowered by means of a lifting device 10 with respect to the axial modules 2a, 2b. For the vertical guidance of the transport device 7, a vertical guide, not shown in further detail, is provided in each case between the transport device 7 and the axial module 2a as well as between the transport device 7 and the axial module 2a. In the illustrated example, the transport device 7 has a platform 8 for loading the rolling carts (not shown in further detail) as load carriers, which rest on rollers on the platform 8. The platform 8 extends across the entire width of the vehicle in the transverse direction Q, so that the rolling carts can be pushed from either side of the vehicle to be raised and lowered onto the platform 8. In the illustrated example, the platform 8 has a vertical transverse plate 8a in the area of ​​the axial module 2a, extending in the transverse direction to the QPfrAnn / zznz / E / YiAi vehicle Q, which is guided in the vertical direction by way of a vertical guide in the axial module 2a. Correspondingly, platform 8 has in the area of ​​the axial module 2b a vertical cross-plate 8b that extends in the direction transverse to vehicle Q, which is guided in the vertical direction by way of a vertical guide in the axial module 2b. In the illustrated example, platform 8, viewed longitudinally from vehicle L, has three entry channels 8c, 8d, and 8e, each of which can accommodate a rolling cart. A vertical divider bridge 8f, extending transversely from vehicle Q, is located between the front entry channel 8c and the central entry channel 8d. Similarly, a vertical divider bridge 8g, extending transversely from vehicle Q, is located between the central entry channel 8d and the rear entry channel 8e. In Figure 2, the transport device 7 is shown in the lowered position and therefore in the lowest extreme position, in which the platform 8 is lowered to the level of the roadway FB, so that the rolling trolleys can be pushed with their rollers onto the entry channels 8c, 8d, 8e of the platform 8. Figure 3 shows the transport device 7 in QPfrAnn / zznz / E / YiAi the raised position and therefore represented in the extreme upper position, in which, by means of the lifting device 10, the platform 8 is raised by the height H from the road surface FB. The auxiliary of the trailing gear 1 continues to have an arch-shaped bridge-type frame 11 – in the side view – that connects the axial modules 2a, 2b. The bridge-type frame 11 consists of a vertical column lia arranged in the axial module 2a, a vertical column 11b arranged in the axial module 2b, and a stringer 11c that connects the vertical columns lia, 11b. The bridge-type frame 11, viewed in the transverse direction of vehicle Q, is centrally arranged. The structure of the lifting device 10, by which the transport device 7 formed by the platform 8 can be raised and lowered in relation to the axial modules 2a, 2b, is described below in relation to Figures 4 to 5d. The lifting device 10 has a lifting shaft 21 driven by a drive motor 20, for example, an electric motor, and mounted on a bearing to rotate about a pivot axis D. The lifting shaft 21 is arranged with the pivot axis D in the longitudinal direction of the vehicle L. In the illustrated exemplary configuration, the lifting shaft 21 is rotatably mounted on a bearing in the longitudinal member 11c of the bridge-type frame 11. Corresponding bearing arrangements 22 are provided for mounting the lifting shaft 21 to the longitudinal member 11c. For this purpose, the lifting shaft 21 is installed in the longitudinal member 11c, which is designed as a tubular profile. The drive motor 20 is also mounted on the longitudinal member 11c. By means of a gearbox 23, the drive motor 20 remains actively connected to the hoist shaft 21 for its operation. In the illustrated example, the gearbox 23 comprises a drive gear 24, which can be designed, for example, as a chain drive. The drive gear 24, designed as a chain drive, comprises a chain 24a driven by the drive motor 20, which drives a sprocket 24b rotatably fixed to the hoist shaft 21. Several lifting linkages 25a-25d are articulated to the lifting shaft 21 at a distance D from the rotation axis of the lifting shaft 21 and are therefore articulated to the lifting shaft 21, which, for raising and lowering the load, are in active connection with the device QPfrRnn / zznz / E / YiAi of transport 7 designed as platform 8. The lifting linkages 25a-25d are for this - as can be seen in Figure 4, in which the lifting device 10 is shown in the extreme lower position - articulated in a articulated manner with a lever arm or crank arm A to the lifting shaft 21. The lifting linkages 25a-25d are guided downwards through suitable openings in the stringer 11c and are connected at their lower ends in each case to the transport device 7. Preferably, the lifting linkages 25a-25d are hinged to the transport device 7. The lifting links 25a-25d are arranged at intervals from each other in the longitudinal direction of the lifting axis 21 and, therefore, in the longitudinal direction of the vehicle L. In the exemplary embodiment shown, the lifting link 25a is connected to the platform 8 in the area of ​​the front cross-plate 8a, the lifting link 25b is connected to the platform 8 in the area of ​​the divider 8f, the lifting link 25c is connected to the platform 8 in the area of ​​the divider 8g, and the lifting link 25d is connected to the platform 8 in the area of ​​the rear cross-plate 8b. For the articulated fixing of the linkages of QPfrAnn / zznz / E / YiAi lifting 25a-25 to the lifting shaft 21, each lifting linkage 25a-25d is articulated to a crank arm device 30 rotatably fixed to the lifting shaft 21. The crank arm device 30 has in the illustrated exemplary mode - as can be seen in Figure 4 - in each case two crank discs 31a, 31b arranged axially spaced on the lifting shaft 21, which are connected to each other and between which the corresponding lifting linkage 25a-25d is arranged. The articulated connection between the lifting linkage 25a-25d and the crank discs 31a, 31b is formed in the exemplary manner shown in each case by a retaining pin 35 which, around the lever arm or crank arm A, displaced in parallel with respect to the rotation axis D of the lifting shaft 21, is arranged in the corresponding mounting holes of the crank discs 31a, 31b.The mounting pin 35 is also housed in a mounting hole at the upper end of the corresponding lifting linkage 25a-25d. As can be seen in Figure 4, the lifting linkage 25a-25d is configured as a hook profile 40 in the area of ​​the joint articulated to the crank arm device 30 and, therefore, in the area of ​​the upper end. The hook profile 40 is configured QPfrAnn / zznz / E / YiAi such that the hook profile 40 rests with an internal area 40a against the outer surface of the lifting shaft 21 in the extreme upper position of the lifting linkage 25a-25d, so that in the extreme upper position the vertical forces of the lifting linkages 25a-25d are supported on the lifting shaft 21. The elevation shaft 21 is formed in the illustrated example as a grooved shaft. The elevation shaft 21 is provided with a corresponding grooved shaft profile along its entire length. For the rotatably fixed connection with the lifting shaft 21, the crank arm device 30 is provided with a hub profile that interacts in a complementary manner with the grooved shaft profile of the lifting shaft 21 formed as a grooved shaft. The lifting shaft 21 is also provided with a mechanical interface, not shown in further detail, to which a hand tool can be connected for manual operation of the lifting shaft 21. The interface is preferably formed by the front and / or rear end of the lifting shaft 21, shaped as a grooved shaft, which is accessible via the open tubular end of the stringer 11c, so that in the event of a failure of the drive motor 20, a hand tool can be applied via the open tubular end of the stringer 11c. QPfrAnn / zznz / E / YiAi hand tool, for example a lever, at the axial end of the lifting shaft 21 configured as a grooved shaft, so that the lifting shaft 21 can be turned by hand. The crank arm device 30, which is located on the lifting shaft 21 and is firmly connected to the lifting shaft 21 and is connected to the lifting linkage 25a-25d, thus constitutes a crank mechanism for raising and lowering the transport device 7. The lifting device 10 comprising the lifting shaft 21, the crank arm devices 30 and the lifting linkages 25a-25d can be easily adapted to different traction train accessories 1 and different transport devices 7 and can be expanded due to the displacement capability of the crank arm devices 30 on the lifting shaft 21 and any number of crank arm devices 30 and any number of connecting rod arm devices 30 and therefore of lifting linkages 25a-25d on the lifting shaft 21. The process of lifting the transport device 7 of the towing train 1 by means of the lifting device 10 is described below on the basis of figures 5a to 5d. In Figure 5a, the lifting device 10 QPfrAnn / zznz / E / YiAi is located in the extreme lower position according to figure 2. If the lifting shaft 21 is rotated counterclockwise by means of the drive motor 20, the lifting linkages 25a-25d, which are articulated with the lever arm A to the lifting shaft 21, move upwards, as shown in Figures 5b and 5c. Due to the mechanical coupling of the lifting linkages 25a-25d to the lifting shaft 21, all the lifting linkages 25a-25d lift simultaneously and synchronously. In Figure 5d, the lifting device 10 is in its upper extreme position as shown in Figure 3. The articulated connection of the lever linkage 25a-25d, formed by the locking pin 35, thus passes the top dead center OT, which lies in the vertical plane. Furthermore, when the top dead center OT is passed, the hook profiles 40 of the lifting linkages 25a-25d are pressed against the outer surface of the lifting shaft 21 with their inner surfaces 40a, so that the downward vertical forces acting on the lifting linkages 25a-25b are supported by the lifting shaft 21. This results in the drive motor 20 being unloaded in its upper extreme position. QPfrAnn / zznz / E / YiAi Furthermore, by overcoming the top dead center OT in the extreme upper position, a dead center lock is achieved between the lifting linkage 25a-25d and the lifting shaft 21, so as to prevent an unintentional descent of the raised transport device 7. It is hereby stated that, as of this date, the best method known to the applicant for putting the aforementioned invention into practice is the one that is clear from the present description of the invention.

Claims

1. Lifting device for a towing train trailer for raising and lowering a load carried in the towing train trailer, characterized in that it comprises a lifting shaft driven by a drive motor and rotatably mounted on a bearing around a rotation axis, to which at least one lifting linkage is articulated, raising and lowering the load at a distance from the rotation axis of the lifting shaft.

2. Lifting device according to claim 1, characterized in that it has at least two lifting linkages that are spaced apart in the longitudinal direction of the lifting axis.

3. Lifting device according to any of claims 1 or 2, characterized in that the lifting linkage is articulated to a crank arm device rotatably fixed to the lifting shaft.

4. Lifting device according to claim 3, characterized in that the QQfrAnn / zznz / E / YiAi crank arm device has two crank discs arranged axially spaced on the lifting shaft, between which the lifting linkage is arranged.

5. Lifting device according to any of claim 3 or 4, characterized in that the lifting linkage is articulated to the crank arm device with a retaining pin arranged parallel to the axis of rotation in the crank arm device 6. Lifting device according to any of claims 1 to 5, characterized in that the lifting linkage is formed as a hook profile in the area of ​​the connection to the lifting shaft, which is designed such that in the upper extreme position of the lifting linkage the hook profile is pressed with an inner surface to the outer surface of the lifting shaft, to support the lifting linkage on the lifting shaft.

7. Lifting device according to any of claims 1 to 6, characterized in that the drive motor, by means of a gearbox, in particular a drive gear, is in active connection with the lifting shaft for its drive.

8. Lifting device in accordance with any of claims 1 to 7, characterized in that in the extreme upper position a dead-point interlock is formed between the lifting linkage and the lifting shaft.

9. Lifting device according to any of claims 1 to 8, characterized in that the lifting shaft is formed as a grooved shaft or as a toothed shaft 10. Lifting device according to claim 9, characterized in that the crank arm device is provided with a hub profile that interacts in a complementary manner with the grooved shaft or the toothed shaft.

11. Lifting device according to any of claims 1 to 10, characterized in that a sensor device is provided which is in active connection with the lifting shaft.

12. Lifting device according to any of claims 1 to 11, characterized in that the lifting shaft is provided with a mechanical interface to which a hand tool can be actively connected for manual operation of the lifting shaft.

13. Trailer of the drag train with a chassis, having two axial modules arranged at a distance QPfrAnn / zznz / E / YiAi 30 in the longitudinal direction of the vehicle, between which the transported load is arranged, characterized in that it is equipped with a lifting device in accordance with any of the preceding claims.

14. Trailer of the drag train according to claim 13, characterized in that it comprises a bridge-type frame connecting the axial modules, comprising vertical columns arranged in the axial modules and a beam connecting the vertical columns, wherein the lifting shaft of the lifting device is rotatably mounted on a bearing in the beam.

15. Trailer of the drag train according to any of claims 13 or 14, characterized in that it comprises a transport device for receiving the load, wherein the transport device is arranged between the axle modules and is raised and lowered by means of the lifting device relative to the axial modules, wherein the lifting linkage of the lifting device is in active connection with the transport device.

16. Trailer of the drag train according to claim 15, characterized in that the transport device is arranged in the axial modules to be raised or lowered by means of QPfrAnn / zznz / E / YiAi 31 respectively a vertical guide.

17. Trailer of the haul train in accordance with any of claims 15 or 16, characterized in that the transport device comprises a platform for rolling carts comprising rollers to be loaded onto, the rolling carts with rollers resting on the platform.

18. Trailer of the drag train in accordance with any of claims 15 or 16, characterized in that the transport device comprises teeth for accommodating the load.

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