An automatic sliding docking device

Abstract

This invention belongs to the field of shelving technology and discloses an automatic sliding docking device. It includes a component rack, a transport rack, and hooks. The component rack is equipped with a first slide rail, and the transport rack is equipped with a second slide rail. The first and second slide rails are connected and parallel to each other. The hook on the first slide rail slides away from the transport rack. A first rotating rod is rotatably mounted on the upper end of the transport rack, and a first swinging part is formed at the end of the first rotating rod. A first pull rope is mounted on the first swinging part, and a first baffle is connected to the lower side of the first pull rope. The first baffle overlaps the second slide rail and prevents the hook from sliding down. A first fixing rod is provided on the component rack. This invention solves the problem in the prior art where manual adjustment of the position of the transport rack and the component rack is required, followed by manually opening the baffle, which reduces production efficiency.

Description

Technical Field

[0001] This invention relates to the field of shelving technology, and in particular to an automatic sliding docking device. Background Technology

[0002] Car parts are attached to a parts rack. The parts rack has two sets of slides on its upper and lower levels, forming a zigzag pattern when viewed from the side. Hooks are slidably connected to the slides, and these hooks slide towards the lower side of the slide under gravity. Parts are hooked onto the hooks on the upper slide. Workers remove the parts from the hooks on the upper slide and install them onto the cars on the production line. Simultaneously, empty hooks are attached to the lower slide, ready for the tools to be sent out. At the other end of the parts rack, workers use a tractor to move a transport frame to the other side of the parts rack. The transport frame also has slides that can connect with the parts rack. After the workers manually adjust and align the slides on the parts rack and the transport frame, they manually lift the baffle that restricts the movement of the hooks. The hooks on the transport frame with car parts slide onto the parts rack, and simultaneously, the empty hooks on the parts rack slide onto the transport frame.

[0003] However, the above operations require workers to repeatedly adjust the position of the transport frame to align the slide, which is time-consuming. At the same time, workers need to repeatedly get on and off the traction vehicle to open the baffle. Even after alignment, there may still be errors, which can cause the hook to detach from the slide when moving between the transport frame and the part, causing the part to fall to the ground and further reducing production efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide an automatic sliding docking device, which solves the problem of reduced production efficiency caused by manually adjusting the position of the transport frame and the component rack and then manually opening the baffle in the existing technology.

[0005] To achieve this objective, the present invention adopts the following technical solution: The present invention provides an automatic sliding docking device, including a component rack, a transport rack, and a hook. The component rack is equipped with a first slide rail, and the transport rack is equipped with a second slide rail. The first slide rail and the second slide rail are connected and parallel to each other. The hook on the first slide rail slides away from the transport rack. A first rotating rod is rotatably mounted on the upper end of the transport rack. A first swinging part is formed at the end of the first rotating rod. A first pull rope is mounted on the first swinging part. A first baffle is connected to the lower side of the first pull rope. The first baffle overlaps the second slide rail and prevents the hook from sliding down. A first fixed rod is provided on the component rack. When the transport rack slides along a direction perpendicular to the movement direction of the hook, the first swinging part strikes the first fixed rod, the first rotating rod rotates, the first swinging part pulls the first pull rope, and the first pull rope pulls the first baffle up. When the first swinging part abuts against the bottom surface of the first fixed rod, the hook slides into the first slide rail along the second slide rail. The first pull rope is located on the side away from the swinging direction of the first swinging part.

[0006] Preferably, the first swing part is L-shaped and rotates around the axis of the first rotating rod. A first roller is rotatably mounted on the side of the first swing part near the first fixed rod. The first roller rolls over the underside of the first fixed rod, and the arc-shaped surface of the first roller contacts the first fixed rod.

[0007] Preferably, the transport frame is provided with a first guide wheel, a first groove is formed in the first guide wheel, the first pull rope is wound around the first groove, and the rotation axis of the first guide wheel is parallel to the moving direction of the hook.

[0008] Preferably, the component rack is equipped with a third slide rail, and the transport frame is equipped with a fourth slide rail. The third and fourth slide rails are connected and parallel to each other. The hook on the third slide rail slides towards the side closer to the transport frame. A second rotating rod is rotatably mounted on the upper end of the component rack. A second swinging part is formed at the end of the second rotating rod. A second pull rope is mounted on the second swinging part. A second baffle is connected to the lower side of the second pull rope. The second baffle overlaps the third slide rail and prevents the hook from sliding down. A second fixed rod is provided on the transport frame. When the transport frame slides perpendicular to the moving direction of the hook, the second swinging part strikes the second fixed rod, the second rotating rod rotates, the second swinging part pulls the second pull rope, and the second pull rope pulls the second baffle up. When the second swinging part abuts against the bottom surface of the second fixed rod, the hook slides along the third slide rail into the fourth slide rail. The second pull rope is located on the side away from the swinging direction of the second swinging part.

[0009] Preferably, the second swing part is L-shaped and rotates around the axis of the second rotating rod. A second roller is rotatably mounted on the side of the second swing part near the second fixed rod. The second roller rolls over the underside of the second fixed rod, and the arc-shaped surface of the second roller contacts the second fixed rod.

[0010] Preferably, the transport frame is provided with a second guide wheel, a second groove is formed in the second guide wheel, the second pull rope is wound around the second groove, and the rotation axis of the second guide wheel is parallel to the moving direction of the hook.

[0011] Preferably, the transport frame is mounted on a mobile flatbed cart, the bottom of which is equipped with casters and a hook is provided at the front end of the mobile flatbed cart. The hook is connected to the rear of a tractor vehicle, and the tractor vehicle drives the mobile flatbed cart to move. Two sets of the transport frames can be mounted on the mobile flatbed cart, and the transport frames are parallel to each other.

[0012] Preferably, a groove is installed on the bottom surface of the component rack near the transport rack. When the caster rolls forward in the groove, the first swinging part hits the first fixed rod, and the second swinging part hits the second fixed rod.

[0013] Preferably, a guide wheel is rotatably mounted on the component rack on the upper side of the slide groove. When the universal wheel rolls forward in the slide groove, the arc surface of the guide wheel abuts against the side wall of the mobile trolley.

[0014] Beneficial effects: When the transport frame is moved to one side of the parts rack, the transport frame drives the first swinging part to move in a straight line. The first swinging part will collide with the first fixed rod on the running path. Since the first rotating rod is rotatably mounted on the transport frame, the first swinging part will rotate around the axis of the first rotating rod. This will pull the first pull rope upward, thereby pulling the first baffle upward. This will cause the hook with the part on the transport frame to slide along the second slide to the first slide. The operator does not need to manually lift the first baffle, reducing the number of operation steps. The baffle can be lifted simply by the collision between the first swinging part and the first fixed rod when the transport frame moves. Then the hook carrying the part can slide into the parts rack, realizing the transfer of parts and improving work efficiency. The operator does not need to move repeatedly. Attached Figure Description

[0015] Figure 1 This is a front view of the assembly of the component rack and the transport rack of the present invention;

[0016] Figure 2 This is a diagram of the main body of the component rack and transport rack of the present invention.

[0017] Figure 3This is a partially enlarged main view of the first and second fixing rods of the present invention;

[0018] Figure 4 This is a front view of the component rack of the present invention;

[0019] Figure 5 This is a main drawing of the component frame of the present invention;

[0020] Figure 6 This is a partially enlarged main body view of the first fixing rod of the present invention;

[0021] Figure 7 This is a front view of the transport frame of the present invention;

[0022] Figure 8 This is a main drawing of the transport frame of the present invention;

[0023] Figure 9 This is a partially enlarged view of the main body of the second fixing rod of the present invention.

[0024] In the diagram: 1. Parts rack; 2. Transport rack; 3. Hook; 4. First slide rail; 5. Second slide rail; 6. Third slide rail; 7. Fourth slide rail; 8. First rotating rod; 9. Second rotating rod; 10. First swinging part; 11. Second swinging part; 13. First roller; 14. Second roller; 15. First pull rope; 16. Second pull rope; 17. First fixing rod; 18. Second fixing rod; 19. First guide wheel; 191. First groove; 20. Second guide wheel; 201. Second groove; 21. Mobile trolley; 211. Caster wheel; 22. Slide rail; 23. Part; 24. Guide wheel; 25. First baffle; 26. Second baffle. Detailed Implementation

[0025] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0026] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0027] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0028] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0029] With existing technology, workers need to use a tractor to move the transport rack to one side of the parts rack. Then, they need to manually get on and off the vehicle repeatedly to align the slide rails before they can manually open the baffle to allow the parts hooks to slide onto the parts rack. This operation is time-consuming because it requires workers to get on and off the vehicle multiple times, resulting in a slow transfer rate from the transport rack to the parts rack.

[0030] To solve the above problems, such as Figures 1 to 9 As shown, the present invention provides an automatic sliding docking device, including a component rack 1, a transport rack 2, and a hook 3. The component rack 1 is equipped with a first slide rail 4, and the transport rack 2 is equipped with a second slide rail 5. The first slide rail 4 and the second slide rail 5 are connected and parallel to each other. The hook 3 on the first slide rail 4 slides away from the transport rack 2. A first rotating rod 8 is rotatably mounted on the upper end of the transport rack 2. A first swinging part 10 is formed at the end of the first rotating rod 8. A first pull rope 15 is mounted on the first swinging part 10. A first baffle 25 is connected to the lower side of the first pull rope 15. The first baffle 25 overlaps... On the second slide rail 5, the first baffle 25 prevents the hook 3 from sliding down, and the component rack 1 is provided with a first fixing rod 17; when the transport rack 2 slides along the direction perpendicular to the movement of the hook 3, the first swing part 10 hits the first fixing rod 17, the first rotating rod 8 rotates, the first swing part 10 pulls the first pull rope 15, and the first pull rope 15 pulls the first baffle 25 to rise; when the first swing part 10 abuts against the bottom surface of the first fixing rod 17, the hook 3 slides along the second slide rail 5 into the first slide rail 4, and the first pull rope 15 is located on the side away from the swing direction of the first swing part 10.

[0031] When the first swinging part 10 rotates and collides with the first fixed rod 17, since the first rotating rod 8 is rotatably mounted on the transport frame 2, the first swinging part 10 will drive the first rotating rod 8 to rotate, thereby pulling the first pull rope 15 and causing the first baffle 25 to rise. At this time, the tractor continues to move forward, and the first swinging part 10 will abut against the lower side of the first fixed rod 17. The rotation angle of the first rotating rod 8 will reach its maximum, and at the same time, the height of the first baffle 25 will reach its maximum. At this time, the first baffle 25 is in a fully raised state. Since the limit of the hook 3 is released, the hook on the transport frame 2... 3 will carry part 23 into part rack 1, realizing the transfer of part 23. At this time, the worker does not need to get on or off the vehicle. He only needs to make sure that the first swing part 10 and the first fixed rod 17 are in contact with each other, saving transfer time and making the transfer of part 23 faster. At the same time, when the hook 3 slides from the second slide 5 to the first slide 4, the tractor stops moving and waits for all the hooks 3 carrying parts 23 to be transferred from the second slide 5 to the first slide 4 before starting the tractor to continue moving. At this time, the first swing part 10 and the first fixed rod 17 are no longer in contact, and the first baffle 25 still falls and rests on the second slide 5.

[0032] Preferably, the first baffle 25 of the present invention is rotatably connected to the transport frame 2. The first pull rope 15 pulls the end of the first baffle 25 away from the rotating shaft, so that the first baffle 25 is pulled up by the first pull rope 15, making it easier for the lower hook 3 to slide into the first slide 4 along the second slide 5. By rotatably connecting the first baffle 25 to the transport frame 2, the first baffle 25 is prevented from shaking back and forth during the movement of the tractor and detaching from the second slide 5, and the hook 3 is also prevented from falling directly to the ground.

[0033] The first swing part 10 is L-shaped and rotates around the axis of the first rotating rod 8. A first roller 13 is rotatably installed on the side of the first swing part 10 near the first fixed rod 17. The first roller 13 rolls over the underside of the first fixed rod 17 and the arc-shaped surface of the first roller 13 contacts the first fixed rod 17.

[0034] By setting the first roller 13 to contact the first fixed rod 17, the frictional force after the first swing part 10 contacts the first fixed rod 17 can be reduced, making the resistance encountered by the tractor less.

[0035] The transport frame 2 of the present invention is provided with a first guide wheel 19, and a first groove 191 is formed in the first guide wheel 19. A first pull rope 15 is wound around the first groove 191. The rotation axis of the first guide wheel 19 is parallel to the moving direction of the hook 3. By providing the first guide wheel 19, the first pull rope 15 can be connected to the first baffle 25 in a direction perpendicular to the horizontal plane, and the friction force on the first pull rope 15 is reduced, so that the first swing part 10 experiences less resistance when pulling the first pull rope 15.

[0036] The component rack 1 of the present invention is equipped with a third slide rail 6, and the transport rack 2 is equipped with a fourth slide rail 7. The third slide rail 6 and the fourth slide rail 7 are connected and parallel to each other. The hook 3 on the third slide rail 6 slides towards the side closer to the transport rack 2. A second rotating rod 9 is rotatably mounted on the upper end of the component rack 1. A second swing part 11 is formed at the end of the second rotating rod 9. A second pull rope 16 is mounted on the second swing part 11. A second baffle 26 is connected to the lower side of the second pull rope 16. The second baffle 26 overlaps the third slide rail 6 and blocks... The hook 3 slides down, and the transport frame 2 is provided with a second fixed rod 18. When the transport frame 2 slides in a direction perpendicular to the movement of the hook 3, the second swing part 11 hits the second fixed rod 18, the second rotating rod 9 rotates, the second swing part 11 pulls the second pull rope 16, and the second pull rope 16 pulls the second baffle 26 to rise. When the second swing part 11 abuts against the bottom surface of the second fixed rod 18, the hook 3 slides along the third slide 6 into the fourth slide 7. The second pull rope 16 is located on the side away from the swing direction of the second swing part 11.

[0037] The component rack 1 is also equipped with a second swing section 11. By lifting the second baffle 26, the empty hook 3 can be transported back to the fourth slide rail 7 on the transport rack 2. Since the second fixed rod 18 is located closer to the front of the tractor than the first rotating section, the contact position between the first swing section 10 and the first fixed rod 17 is higher than the contact position between the second swing section 11 and the second fixed rod 18, to prevent the transport rack 2 from being limited during movement. Similarly, when the second swing section 11 moves to the bottom of the second fixed rod 18, the second baffle 26 can be raised to its highest position. At this time, the hook 3 will slide from the third slide 6 into the fourth slide 7. At this time, the first baffle 25 and the second baffle 26 will be lifted at the same time. While the part 23 is transported to the component rack 1 through the hook 3, the empty hook 3 will also be transported back from the component rack 1 to the transport rack 2. The staff only needs to drive the tractor to hit the first swing part 10 and the first fixed rod 17, and at the same time make the second swing part 11 and the second fixed rod 18 hit each other. Without getting off the vehicle, the first baffle 25 and the second baffle 26 can be lifted at the same time, so that the hook 3 can be transported to the next process, thus improving work efficiency.

[0038] The second swing part 11 is L-shaped and rotates around the axis of the second rotating rod 9. A second roller 14 is rotatably mounted on the side of the second swing part 11 near the second fixed rod 18. The second roller 14 rolls under the second fixed rod 18, and its arc-shaped surface contacts the second fixed rod 18. The second roller 14 reduces the friction between the second swing part 11 and the second fixed rod 18, thus reducing the resistance experienced by the tractor.

[0039] The transport frame 2 is equipped with a second guide wheel 20, and a second groove 201 is formed inside the second guide wheel 20. The second pull rope 16 is wound around the second groove 201, and the rotation axis of the second guide wheel 20 is parallel to the moving direction of the hook 3. This allows the second pull rope 16 to be perpendicular to the upper surface of the second baffle 26, pulling the second baffle 26 vertically upward to allow the empty hook 3 to pass through.

[0040] The transport frame 2 is installed on the mobile flatbed 21. The bottom of the mobile flatbed 21 is equipped with casters 211. The front end of the mobile flatbed 21 is equipped with a hook 3, which is connected to the rear of the tractor. The tractor drives the mobile flatbed 21 to move. A worker stands on the tractor to drive it. Two sets of transport frames 2 can be installed on the mobile flatbed 21. The transport frames 2 are parallel to each other.

[0041] Each mobile cart 21 is equipped with two sets of transport racks 2. Before contacting the parts rack 1, each set of transport racks 2 carries a large number of automotive parts 23 on its second slide 5. The automotive parts 23 are hooked by hooks 3. The fourth slide 7 is empty. Then, each set of transport racks 2 contacts the parts rack 1 in turn, transporting the hooks 3 with parts 23 to the first slide 4, and at the same time transporting the empty hooks 3 to the fourth slide 7. The mobile carts 21 can be connected to each other in a train-like manner, so that more transport racks 2 can transport parts 23 to the parts rack 1. Each parts rack 1 can place parts 23 from multiple sets of transport racks 2.

[0042] A chute 22 is installed on the bottom surface of the component rack 1 near the transport rack 2. When the caster wheel 211 rolls forward in the chute 22, the first swing part 10 hits the first fixed rod 17, and the second swing part 11 hits the second fixed rod 18. By setting the chute 22, it is convenient for the worker to drive the tractor to send the caster wheel 211 into the chute 22. As long as the caster wheel 211 on the side of the moving cart 21 enters the chute 22, the first swing part 10 can hit the first fixed rod 17, and at the same time, the second swing part 11 can hit the second fixed rod 18. This reduces the difficulty for the worker to drive the tractor to achieve the above-mentioned structural impact. The lifting of the first baffle 25 and the second baffle 26 does not require an electric device, which can reduce the cost of manufacturing the component rack 1 and the transport rack 2.

[0043] A guide wheel 24 is rotatably mounted on the component rack 1 on the upper side of the chute 22. When the caster wheel 211 rolls forward in the chute 22, the arc surface of the guide wheel 24 abuts against the side wall of the mobile trolley 21. When the mobile trolley 21 passes through the chute 22, the side of the transport frame 2 contacts the guide wheel 24. The guide wheel 24 can convert sliding friction into rolling friction, thereby reducing the resistance of the tractor dragging the mobile trolley 21.

[0044] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. An automatic sliding docking device, characterized in that, The assembly includes a parts rack (1), a transport rack (2), and hooks (3). The parts rack (1) is equipped with a first slide rail (4), and the transport rack (2) is equipped with a second slide rail (5). The first slide rail (4) and the second slide rail (5) are connected and parallel to each other. The hooks (3) on the first slide rail (4) slide away from the transport rack (2). A first rotating rod (8) is rotatably mounted on the upper end of the transport rack (2). A first swing part (10) is formed at the end of the first rotating rod (8). A first pull rope (15) is mounted on the first swing part (10). A first baffle (25) is connected to the lower side of the first pull rope (15). The first baffle (25) overlaps the second slide rail (5). 25) The hook (3) is blocked from sliding down. A first fixed rod (17) is provided on the component rack (1). When the transport rack (2) slides in a direction perpendicular to the movement direction of the hook (3), the first swing part (10) hits the first fixed rod (17), the first rotating rod (8) rotates, the first swing part (10) pulls the first pull rope (15), and the first pull rope (15) pulls the first baffle (25) up. When the first swing part (10) abuts against the bottom surface of the first fixed rod (17), the hook (3) slides into the first slide (4) along the second slide (5), and the first pull rope (15) is set on the side away from the swing direction of the first swing part (10).

2. The automatic sliding docking device according to claim 1, characterized in that, The first swing part (10) is L-shaped and rotates around the axis of the first rotating rod (8). A first roller (13) is rotatably mounted on the side of the first swing part (10) close to the first fixed rod (17). The first roller (13) rolls over the underside of the first fixed rod (17), and the arc-shaped surface of the first roller (13) contacts the first fixed rod (17).

3. The automatic sliding docking device according to claim 1, characterized in that, The transport frame (2) is provided with a first guide wheel (19), a first groove (191) is formed in the first guide wheel (19), the first pull rope (15) is wound around the first groove (191), and the rotation axis of the first guide wheel (19) is parallel to the moving direction of the hook (3).

4. The automatic sliding docking device according to claim 1, characterized in that, The component rack (1) is equipped with a third slide rail (6), and the transport rack (2) is equipped with a fourth slide rail (7). The third slide rail (6) and the fourth slide rail (7) are connected and parallel to each other. The hook (3) on the third slide rail (6) slides towards the side closer to the transport rack (2). A second rotating rod (9) is rotatably installed on the upper end of the component rack (1). A second swing part (11) is formed at the end of the second rotating rod (9). A second pull rope (16) is installed on the second swing part (11). A second baffle (26) is connected to the lower side of the second pull rope (16). The second baffle (26) overlaps the third slide rail (6) and blocks the hook (3). When the transport frame (2) slides down, a second fixed rod (18) is provided on the transport frame (2); when the transport frame (2) slides along the direction perpendicular to the movement of the hook (3), the second swing part (11) hits the second fixed rod (18), the second rotating rod (9) rotates, the second swing part (11) pulls the second pull rope (16), and the second pull rope (16) pulls the second baffle (26) up; when the second swing part (11) abuts against the bottom surface of the second fixed rod (18), the hook (3) slides along the third slide (6) into the fourth slide (7), and the second pull rope (16) is set on the side away from the swing direction of the second swing part (11).

5. The automatic sliding docking device according to claim 4, characterized in that, The second swing part (11) is L-shaped and rotates around the axis of the second rotating rod (9). A second roller (14) is rotatably mounted on the side of the second swing part (11) close to the second fixed rod (18). The second roller (14) rolls over the underside of the second fixed rod (18), and the arc-shaped surface of the second roller (14) contacts the second fixed rod (18).

6. The automatic sliding docking device according to claim 4, characterized in that, The transport frame (2) is provided with a second guide wheel (20), and a second groove (201) is formed in the second guide wheel (20). The second pull rope (16) is wound around the second groove (201), and the rotation axis of the second guide wheel (20) is parallel to the moving direction of the hook (3).

7. The automatic sliding docking device according to claim 4, characterized in that, The transport frame (2) is installed on the mobile flatbed (21). The bottom of the mobile flatbed (21) is equipped with casters (211). The front end of the mobile flatbed (21) is provided with a hook (3). The hook (3) is connected to the rear of the tractor. The tractor drives the mobile flatbed (21) to move. Two sets of the transport frames (2) can be installed on the mobile flatbed (21). The transport frames (2) are parallel to each other.

8. The automatic sliding docking device according to claim 7, characterized in that, The component rack (1) has a groove (22) installed on its bottom surface near the transport rack (2). When the caster wheel (211) rolls forward in the groove (22), the first swing part (10) hits the first fixed rod (17), and the second swing part (11) hits the second fixed rod (18).

9. The automatic sliding docking device according to claim 8, characterized in that, A guide wheel (24) is rotatably mounted on the component rack (1) on the upper side of the slide (22). When the universal wheel (211) rolls forward in the slide (22), the arc surface of the guide wheel (24) abuts against the side wall of the mobile trolley (21).

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