Taper spiral track cable support order trolley traction device

Abstract

The invention relates to a tapered spiral track cable support order trolley traction device which comprises a track, a support order trolley and a support order support, the track is arranged in a vortex line shape with taper, the sliding support order trolley is arranged on the track, the upper end of the support order support is connected with a cantilever, and the lower end of the support order support is provided with a bidirectional telescopic mechanism. The command supporting bracket is connected with a head trolley of the command supporting trolley through a bidirectional telescopic mechanism; the bidirectional telescopic mechanism comprises a horizontal telescopic unit and a vertical telescopic unit, the horizontal telescopic unit comprises a horizontal fixed rod and a horizontal movable rod sliding on the horizontal fixed rod, the vertical telescopic unit is arranged on the horizontal movable rod, and the vertical telescopic unit comprises a vertical fixed frame and a vertical movable bracket elastically connected to the upper portion of the vertical fixed frame. Influences caused by rail installation deformation can be eliminated, the deformation resistance of the supporting frame is improved, meanwhile, the supporting frame can drive the head car to run along the rail through the horizontal and vertical two-way telescopic structure, and it is guaranteed that the head car moves smoothly and is not blocked.

Description

Technical Field

[0001] The invention relates to the technical field of stacker-reclaimers, and in particular to a traction device for a cable-carrying trolley with a taper spiral track. Background Art

[0002] The existing cantilever stacker and reclaimer are mostly powered by slip rings, and some stackers are powered by conventional cable support methods. Specifically, a flat spiral I-beam track is arranged outside the central column of the stacker and reclaimer, and there are support trolleys on the track. The support trolleys include a tail car, a head car and multiple intermediate cars. The tail car is fixed on the track, and the intermediate car is arranged between the tail car and the head car. The adjacent cars are connected by wire ropes, and the head car drives the intermediate car to slide along the track.

[0003] The cantilever of the stacker-reclaimer rotates around the central column. The cantilever must be able to work within a 360° range. An L-shaped support bracket is arranged vertically at the bottom of the cantilever. The rotation of the cantilever drives the support bracket to move together, and the support bracket drives the head car to move. The cable led out of the power distribution room is wound around the support trolley, and finally arranged on the support bracket and led into the electrical room on the cantilever. The cable moves under the drive of the support trolley. Figure 1-Figure 3 shown.

[0004] The cable is arranged on the support trolley as follows: it is introduced from the rear car, then arranged between multiple middle cars, and finally led out to the support bracket through the head car. As the head car moves, the cable is stretched or gathered. In the initial state, the head car and the rear car are close to each other, and the middle cars gather at one place on the track. Then the support trolley itself will occupy a part of the track, which makes the head car unable to rotate 360°. Therefore, the track is designed to be spiral to compensate for the occupied part of the track, so that the head car can go around the track.

[0005] When the stacker-reclaimer is working, the operation of the cantilever drives the support bracket to rotate, and the support bracket drives the head car to rotate along the track, so that the head car gradually moves away from the tail car, and multiple intermediate cars gradually spread out and move away. Moreover, since the track is spiral, the turning radius of the head car will change, and thus the support bracket cannot adopt a fixed structure when connected to the head car, but a retractable adjustable structure.

[0006] The existing retractable adjustment structure is to open a square traction hole on the head car, and the lower end of the support bracket is horizontally extended into the traction hole, so that the support bracket can drag the head car to move. When the rotation radius of the support bracket is constant, the head car can slide horizontally at the lower end of the support bracket to adapt to the radius change of the track. For example, a cable trolley device disclosed in patent publication number CN105197676B realizes the rotation angle range of the trolley device to reach 360° through a retractable traction device.

[0007] Due to the long length and heavy weight of the cable, the weight of the cable and the trolley is completely borne by the track, and the contact area between the track and the center column is small, so the support strength of the track is weak. In addition, the working conditions of the equipment during operation are difficult to predict, which will cause the track to deform under stress. After the track is deformed, it will cause friction with the trolley, and the stress angle of the trolley and the operating angle will form an angle. The change in angle will affect the operation of the trolley, causing the trolley to run poorly and even jamming in dead corners.

[0008] The support bracket needs to extend to the inner circle of the track to pull the lead car, and then drive the lead car slowly to the outer circle, while the middle car is pulled away. However, track deformation and equipment deformation will change the stretching angle of the support bracket, which will damage the trolley, the traction hole of the support trolley, and even the wheels. It is a common phenomenon. Because there are overlapping areas on the track, the lead car will pass the tail car when sliding along the track. Once the track is deformed, the support bracket and the lead car may collide with the tail car, causing an accident. Summary of the invention

[0009] In order to solve the problem that the spiral track is easy to deform, which leads to the poor operation of the support bracket and the support trolley, the present invention provides a cable support trolley traction device with a tapered spiral track, optimizes the track structure and designs it into a tapered spiral track, increases the contact area between the track and the center column, and increases the supporting strength of the center column to the track. At the same time, the connection structure of the support bracket and the head car is designed to be retractable in the horizontal and vertical directions, ensuring that the support bracket can pull the head car to run on the spiral track.

[0010] To achieve the above purpose, the technical solution adopted by the present invention is: A cable trolley traction device for a spiral track with a taper, comprising a track, a trolley and a trolley support, wherein the track is arranged in a spiral line with a taper, and the track has multiple turns, the trolley is slidably arranged on the track, and the moving path of the trolley is a spiral line, the upper end of the trolley support is connected to a cantilever, and the lower end is provided with a two-way telescopic mechanism, the cantilever is convenient for driving the trolley support to move, and the trolley support is connected to the head car of the trolley through the two-way telescopic mechanism, so as to avoid interference between the trolley support and the track; The bidirectional telescopic mechanism includes a horizontal telescopic unit and a vertical telescopic unit. The horizontal telescopic unit includes a horizontal fixed rod and a horizontal movable rod sliding on the horizontal fixed rod, which is convenient for horizontal telescopic expansion. The vertical telescopic unit is arranged on the horizontal movable rod. The vertical telescopic unit includes a vertical fixed frame and a vertical movable bracket elastically connected above the vertical fixed frame, which is convenient for vertical telescopic expansion.

[0011] Furthermore, the track is of I-beam steel structure and is arranged outside the central column. There are diameter differences and height differences between the coils of the track. Safety stops are provided at both ends of the track to prevent the tail car and the head car from sliding out of the track. The tail car of the trolley is fixed at the lower end of the track and is used to receive the cable led out from the power distribution room and introduce the cable onto the trolley. The cable is then arranged on the middle car and the head car accordingly.

[0012] Furthermore, the bidirectional telescopic mechanism is connected through a horizontal fixed rod and a trolley support. The horizontal fixed rod is of rectangular tube structure, which is convenient for passing through the horizontal movable rod, and the horizontal movable rod is passed through the horizontal fixed rod. Two rows of guiding members are arranged inside the horizontal fixed rod. The two rows of guiding members are arranged at intervals up and down. The horizontal movable rod is arranged between the upper and lower rows of guiding members and is connected to the guiding members, which is convenient for guiding the horizontal sliding of the horizontal movable rod.

[0013] Furthermore, the guiding member is a hydrostatic guide rail. The fixed end of the hydrostatic guide rail is fixedly connected to the horizontal fixed rod, and the movable end of the hydrostatic guide rail is fixedly connected to the horizontal movable rod. Alternatively, the guiding member is a guide wheel. The number of guide wheels in each row is multiple, and the guide wheels roll along the surface of the horizontal movable rod. The guiding member can provide guidance on the one hand and improve the smoothness of the sliding of the horizontal movable rod on the other hand.

[0014] Furthermore, fixed stop baffles are provided at the openings at both ends of the horizontal fixed rod. One end of the horizontal movable rod horizontally passes through a fixed stop baffle and then connects to the vertical telescopic unit. An movable stop baffle is also arranged outside the horizontal movable rod, and the movable stop baffle slides between the fixed stop baffles at both ends of the horizontal fixed rod, which is convenient for limiting the sliding of the horizontal movable rod.

[0015] Furthermore, the vertical fixing frame includes two fixed vertical rods arranged at intervals. The fixed vertical rods are vertically arranged on the horizontal movable rod. The fixed vertical rods are of rectangular tube structure, which is convenient for inserting the vertical moving bracket. Fixed baffles are provided in the middle and at the upper end inside the fixed vertical rods.

[0016] Furthermore, the vertical moving bracket is a rod with an inverted "U" - shaped cross - section. The two sides of the vertical moving bracket vertically extend into the two fixed vertical rods respectively and are connected with movable baffles. The movable baffles slide between the fixed baffles in the middle and at the upper end of the fixed vertical rods, which is convenient for limiting the up - and - down sliding of the vertical moving bracket. A compression spring is arranged between the movable baffle and the fixed baffle located in the middle of the fixed vertical rod to achieve the elastic sliding of the vertical moving bracket. A traction hole is provided on the head car of the support trolley, and the horizontal section of the vertical movable bracket is inserted into the traction hole. The longitudinal section of the horizontal section of the vertical movable bracket is smaller than the traction hole, which facilitates the horizontal and vertical movement of the vertical movable bracket within the range of the traction hole.

[0017] Through the above technical solution, the beneficial effects of the present invention are: The structure of the present invention is reasonably designed. The track is designed to be a spiral line with a certain height, thereby increasing the combined area with the central column, improving the support strength of the track and the anti-deformation ability of the track, thereby increasing the load-bearing capacity of the track, and effectively bearing the support trolleys and cables. The track does not overlap in the horizontal direction, thereby avoiding the potential risk of collision between the support trolleys.

[0018] The support trolley of the present invention can move along the track, but since the rotation path of the support bracket is fixed, a two-way telescopic mechanism is used to avoid interference between the support bracket and the track when it moves. The two-way telescopic mechanism has two-way functions of horizontal telescopic and height telescopic, ensuring that the support trolley can run smoothly on the track without jamming. Even if the track is slightly deformed, the problem of failure of the connection between the support bracket and the support trolley and damage to the support trolley can still be avoided.

[0019] When the support trolley of the present invention runs on the tapered track, the height of the support trolley changes, and the support bracket and the support trolley can achieve the function of height synchronization through the up and down movement of the vertical telescopic unit. At the same time, the turning radius of the support trolley changes, and the horizontal movement of the horizontal telescopic unit can achieve the function of turning radius synchronization of the support bracket and the support trolley. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a conventional cable support power supply diagram.

[0021] Figure 2 yes Figure 1 A top view of the middle track, where the support bracket drives the head car to reciprocate between points B and F on the track.

[0022] Figure 3 yes Figure 1 Schematic diagram of the mid-support trolley.

[0023] Figure 4 The utility model discloses a front view of a track of a cable-supporting trolley traction device with a taper on a spiral track of the present invention.

[0024] Figure 5 The utility model discloses a track top view of a tapered spiral track cable support trolley traction device of the present invention.

[0025] Figure 6The present invention discloses a front view of a support bracket of a traction device for a cable support trolley with a taper on a spiral track.

[0026] Figure 7 The invention discloses a conical spiral track cable support trolley traction device. Figure 6 Schematic diagram of the bidirectional telescopic mechanism.

[0027] Figure 8 The invention discloses a schematic diagram of the installation of a bidirectional telescopic mechanism and a head vehicle of a trolley traction device of a tapered spiral track cable support vehicle.

[0028] The numbers in the accompanying drawings are: 1 center column, 2 track, 3 support trolley, 31 head car, 32 tail car, 33 middle car, 4 wire rope, 7 support bracket, 8 cantilever, 9 traction hole, 10 two-way telescopic mechanism, 101 horizontal telescopic unit, 102 vertical telescopic unit, 11 horizontal fixed rod, 12 horizontal movable rod, 13 guide member, 14 fixed stop plate, 15 movable stop plate, 16 vertical fixed frame, 161 fixed vertical rod, 17 compression spring, 18 vertical movable bracket, 181 vertical section, 182 horizontal section, 19 fixed baffle, 20 movable baffle. DETAILED DESCRIPTION

[0029] The specific implementation of the present invention is described in detail below with reference to the accompanying drawings: like Figure 4~Figure 8 As shown, a tapered spiral track cable trolley traction device comprises a track 2, a trolley 3 and a trolley support 7. The track 2 is arranged outside the central column 1. The track 2 is the same as the conventional track 2 in that both are I-beam structures, but it is also different from the conventional planar spiral track 2. Here, the track 2 is arranged in a tapered spiral line, and there are diameter differences and height differences between each circle of the track 2, such as Figure 4 Due to the special arrangement shape of the track 2, the connection area with the central column 1 can be increased, and the support strength of the central column 1 on the track 2 can be improved, thereby increasing the load-bearing capacity of the track 2.

[0030] A support trolley 3 is slidably arranged on the track 2. The support trolley 3 still includes a head car 31, a plurality of intermediate cars 33 and a tail car 32. The tail car 32 is fixed at the lower end of the track 2. The head car 31 and the intermediate car 33 can move along the track 2. Since the track 2 is arranged in a spiral shape, the moving paths of the head car 31 and the intermediate car 33 are spiral lines, such as Figure 5 Safety stops are provided at both ends of the track 2 to prevent the leading vehicle 31 and the trailing vehicle 32 from leaving the track 2.

[0031] The upper end of the support bracket 7 is connected to the cantilever 8, and when the cantilever 8 rotates, the support bracket 7 is driven to rotate together. The support bracket 7 needs to pull the head car 31 to move, and then the lower end of the support bracket 7 is connected to the head car 31. Since the moving trajectory of the head car 31 is a spiral line, the support bracket 7 has a special connection structure to adapt to the change of the moving path of the head car 31.

[0032] In this embodiment, a two-way telescopic mechanism 10 is provided at the lower end of the support bracket 7, and the support bracket 7 is connected to the head car 31 of the support trolley 3 through the two-way telescopic mechanism 10. Through the horizontal and vertical telescopic movement, the support bracket 7 is adapted to the changes in the diameter and height of the track 2, thereby achieving good operation of the head car 31. Figure 6 shown.

[0033] like Figure 7 As shown, the bidirectional telescopic mechanism 10 includes a horizontal telescopic unit 101 and a vertical telescopic unit 102. The horizontal telescopic unit 101 can adapt to the change of the radius of the track 2. The horizontal telescopic unit 101 includes a horizontal fixed rod 11 and a horizontal movable rod 12 sliding on the horizontal fixed rod 11. The bidirectional telescopic mechanism 10 is connected to the support bracket 7 through the horizontal fixed rod 11. The horizontal fixed rod 11 is a rectangular tube structure, and the horizontal movable rod 12 is inserted into the horizontal fixed rod 11. On the basis of the horizontal fixed rod 11 being fixed, the horizontal movable rod 12 can slide relative to the horizontal fixed rod 11, thereby generating a telescopic movement, and the telescopic direction is the horizontal direction.

[0034] In order to guide the operation of the horizontal telescopic unit 101, two rows of guide members 13 are provided in the horizontal fixed rod 11, and the two rows of guide members 13 are arranged at intervals in the upper and lower directions, and the horizontal movable rod 12 is arranged between the upper and lower rows of guide members 13, which is equivalent to clamping the horizontal movable rod 12. The horizontal movable rod 12 is connected to the guide member 13, and the guide member 13 provides guidance for the sliding of the horizontal movable rod 12 and ensures that the horizontal movable rod 12 slides smoothly.

[0035] The guide member 13 is a hydrostatic guide rail. The hydrostatic track 2 is composed of a guide rail and a slider. The fixed end of the hydrostatic guide rail is connected and fixed to the horizontal fixed rod 11, that is, the guide rail is fixed to the horizontal fixed rod 11; the movable end of the hydrostatic guide rail is connected and fixed to the horizontal movable rod 12, that is, the slider is fixed to the horizontal movable rod 12. The slider can slide flexibly on the guide rail, and then the horizontal movable rod 12 can slide smoothly on the horizontal fixed rod 11. The guide member 13 can also be a guide wheel. Two rows of guide members 13 have two rows of guide wheels, and each row has a plurality of guide wheels. The guide wheels roll along the surface of the horizontal movable rod 12, which can also promote the smooth sliding of the horizontal movable rod 12.

[0036] To limit the horizontal movement of the horizontal movable rod 12, fixed stop baffles 14 are provided at both openings of the horizontal fixed rod 11. The fixed stop baffles 14 can block the horizontal fixed rod 11. One end of the horizontal movable rod 12 passes horizontally through a fixed stop baffle 14 and is located outside the horizontal fixed rod 11. When the horizontal movable rod 12 moves inward and extends into the horizontal fixed rod 11, one end of the horizontal movable rod 12 abuts against a fixed stop baffle 14. At this time, the horizontal movable rod 12 can no longer move inward, and thus the sliding direction of the horizontal movable rod 12 can be limited.

[0037] To limit the horizontal movable rod 12 in its other sliding direction, a movable stop baffle 15 is further provided outside the horizontal movable rod 12. The movable stop baffle 15 slides between the fixed stop baffles 14 at both ends of the horizontal fixed rod 11. When the horizontal movable rod 12 moves outward and extends out of the horizontal fixed rod 11, the movable stop baffle 15 moves outward accordingly. Once the movable stop baffle 15 abuts against the other fixed stop baffle 14, the horizontal movable rod 12 can no longer move outward, thereby restricting the other sliding direction of the horizontal movable rod 12 and preventing the horizontal movable rod 12 from detaching from the horizontal fixed rod 11.

[0038] A vertical telescopic unit 102 is provided on the horizontal movable rod 12, that is, one end of the horizontal movable rod 12 passing through the horizontal fixed rod 11 is connected to the vertical telescopic unit 102. The vertical telescopic unit 102 can adapt to the height change of the track 2. The vertical telescopic unit 102 includes a vertical fixed frame 16 and a vertical moving bracket 18 elastically connected above the vertical fixed frame 16.

[0039] The vertical fixed frame 16 includes two spaced fixed vertical rods 161. The fixed vertical rods 161 are rectangular tubular structures. The fixed vertical rods 161 are vertically arranged on the horizontal movable rod 12, and fixed baffles 19 are provided in the middle and at the upper end inside the fixed vertical rods 161.

[0040] The vertical moving bracket 18 is a rod with an inverted "U" - shaped cross - section. The vertical moving bracket 18 includes vertical segments 181 on both sides and a horizontal segment 182 in the middle. The two sides of the vertical moving bracket 18 vertically extend into the two fixed vertical rods 161 respectively and are connected with movable baffles 20. When extending in, the vertical segments 181 only pass through the fixed baffle 19 at the upper end of the fixed vertical rod 161. Thus, the movable baffle 20 is located between the fixed baffles 19 in the middle and at the upper end of the fixed vertical rod 161, and the movable baffle 20 can slide between the two fixed baffles 19 driven by the vertical moving bracket 18.

[0041] In order to realize the elastic sliding of the vertical movable bracket 18, a compression spring 17 is arranged between the movable baffle 20 and the fixed baffle 19 located in the middle of the fixed vertical rod 161, so that the vertical fixed frame 16 and the vertical movable bracket 18 can generate elastic telescopic movement, and the telescopic direction is the vertical direction.

[0042] The vertically movable bracket 18 needs to be connected to the head car 31. Specifically, a traction hole 9 is provided on the head car 31 of the trolley 3, and the traction hole 9 is a square hole; Figure 8 As shown, the horizontal section 182 of the vertical moving bracket 18 is inserted into the traction hole 9, and the horizontal section 182 is arranged to slide in the traction hole 9, so that the vertical moving bracket 18 can move horizontally in the traction hole 9. The longitudinal section of the horizontal section 182 of the vertical moving bracket 18 is smaller than the traction hole 9, that is, there is a gap between the horizontal section 182 and the wall of the traction hole 9, so that the vertical moving bracket 18 can move vertically in the traction hole 9, playing a role in adapting to changes in the track 2.

[0043] The principle of the present invention is as follows: a two-way telescopic mechanism 10 is installed at the lower end of the support bracket 7, and the two-way telescopic mechanism 10 is connected to the head car 31 of the support trolley 3. Since the turning radius of the support bracket 7 is constant, and the running radius and height of the head car 31 will change with the track 2, the two-way telescopic mechanism 10 can flexibly adapt to the changes of the track 2. The two-way telescopic mechanism 10 can be telescoped in the horizontal direction and the vertical direction, avoiding the problem of interference between the support bracket 7 and the track 2.

[0044] The track 2 is a spiral structure with a certain height, and there is no overlap between the circles of the track 2, thereby increasing the support area of ​​the track 2 and the central column 1, ensuring the support strength of the track 2, and being able to effectively carry the support trolley 3 and cables, reducing the possibility of deformation of the track 2. Even if the track 2 is slightly deformed, under the action of the bidirectional telescopic mechanism 10, it can still ensure that the support bracket 7 drives the head car 31 to move.

[0045] It should be noted that the installation of track 2 requires the use of track hangers, which are not shown in the figure. The production of the hanger is simple and convenient. Steel sections of different lengths are selected and arranged vertically and aligned with the axis of the central column 1. The lower end of the hanger is connected to the track 2, and then the upper ends of all hangers are ensured to be on the same horizontal plane and welded to the bottom of the platform. The platform here refers to a separate auxiliary structure platform on the central column 1, which can also be regarded as a support hoisting platform. The platform is arranged above the track 2. The number of hangers can be appropriately adjusted according to the number of cables and support trolleys, so that the hangers are evenly distributed around the track.

[0046] The embodiments described above are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made according to the structures, features and principles described in the patent scope of the present invention should be included in the scope of the patent application of the present invention.

Claims

1. A tapered spiral track cable trolley traction device, comprising a track (2), a trolley (3) and a trolley bracket (7), characterized in that: The track (2) is arranged in a spiral line shape with a taper, the support trolley (3) is slidably arranged on the track (2), the support bracket (7) is connected to a cantilever (8) at the upper end, and a two-way telescopic mechanism (10) is arranged at the lower end, and the support bracket (7) is connected to the head vehicle (31) of the support trolley (3) via the two-way telescopic mechanism (10); The bidirectional telescopic mechanism (10) comprises a horizontal telescopic unit (101) and a vertical telescopic unit (102); the horizontal telescopic unit (101) comprises a horizontal fixed rod (11) and a horizontal movable rod (12) sliding on the horizontal fixed rod (11); the vertical telescopic unit (102) is arranged on the horizontal movable rod (12); the vertical telescopic unit (102) comprises a vertical fixed frame (16) and a vertical movable bracket (18) elastically connected above the vertical fixed frame (16).

2. A tapered spiral track cable trolley traction device according to claim 1, characterized in that: The track (2) is an I-beam structure. The track (2) is arranged outside the central column (1). There are diameter differences and height differences between the circles of the track (2). Safety stops are provided at both ends of the track (2). The tail car (32) of the supporting trolley (3) is fixed to the lower end of the track (2).

3. A tapered spiral track cable trolley traction device according to claim 1, characterized in that: The bidirectional telescopic mechanism (10) is connected to the support bracket (7) via a horizontal fixed rod (11); the horizontal fixed rod (11) is a rectangular tube structure, and the horizontal movable rod (12) is inserted into the horizontal fixed rod (11); Two rows of guide members (13) are arranged in the horizontal fixed rod (11), the two rows of guide members (13) are arranged at intervals up and down, the horizontal movable rod (12) is arranged between the upper and lower rows of guide members (13), and the horizontal movable rod (12) and the guide member (13) are connected.

4. A tapered spiral track cable trolley traction device according to claim 3, characterized in that: The guide member (13) is a hydrostatic guide rail, the fixed end of the hydrostatic guide rail is connected and fixed to the horizontal fixed rod (11), and the movable end of the hydrostatic guide rail is connected and fixed to the horizontal movable rod (12); Alternatively, the guide member (13) is a guide wheel, and there are a plurality of guide wheels in each row, and the guide wheels roll along the surface of the horizontal movable rod (12).

5. The cable-carrying trolley traction device with a tapered spiral track according to claim 3, characterized in that: Fixed stop plates (14) are provided at the openings at both ends of the horizontal fixed rod (11); one end of the horizontal movable rod (12) passes through a fixed stop plate (14) horizontally and is connected to the vertical telescopic unit (102); a movable stop plate (15) is further provided outside the horizontal movable rod (12); the movable stop plate (15) slides between the fixed stop plates (14) at both ends of the horizontal fixed rod (11).

6. A tapered spiral track cable trolley traction device according to claim 1, characterized in that: The vertical fixing frame (16) comprises two fixed vertical rods (161) arranged at intervals, the fixed vertical rods (161) being vertically arranged on the horizontal movable rod (12), the fixed vertical rods (161) being a rectangular tubular structure, and fixed baffles (19) being arranged in the middle and at the upper end of the fixed vertical rods (161).

7. A tapered spiral track cable trolley traction device according to claim 6, characterized in that: The cross-section of the vertical moving bracket (18) is an inverted "U" shape. The two sides of the vertical moving bracket (18) vertically extend into two fixed vertical rods (161) respectively and are connected with a movable baffle (20). The movable baffle (20) is slidably arranged between the fixed baffle (19) in the middle and the upper end of the fixed vertical rod (161). A compression spring (17) is arranged between the movable baffle (20) and the fixed baffle (19) located in the middle of the fixed vertical rod (161). A traction hole (9) is formed on the head car (31) of the trailing trolley (3). The horizontal section (182) of the vertical moving bracket (18) is inserted into the traction hole (9), and the longitudinal section of the horizontal section (182) of the vertical moving bracket (18) is smaller than that of the traction hole (9).

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