Steel structural member welding displacement device

Abstract

The invention relates to the technical field of welding displacers, and discloses a steel structural member welding displacement device which comprises a moving track and two supporting seats connected to the moving track, a shielding belt is slidably connected to the surface of the moving track and located between the two supporting seats, and the two ends of the shielding belt are fixedly connected with the outer wall of a connecting roller and the outer wall of a winding roller correspondingly. Rotating shafts are fixedly connected to the middle of the connecting roller and the middle of the winding roller, positioning blocks are rotationally connected to the two ends of the rotating shaft connected to the connecting roller correspondingly, connecting blocks are rotationally connected to the two ends of the rotating shaft connected to the winding roller correspondingly, and clamping rods are fixedly connected between the two positioning blocks and between the two connecting blocks correspondingly; and one end of the rotating shaft connected to the winding roller is fixedly connected with a grab handle. According to the welding displacement device for the steel structural component, a safe shielding space is provided for the movable track through mutual cooperation of the shielding belt, the connecting roller and the winding roller, and the situation that welding slag falls on the movable track is effectively avoided.

Description

Technical Field

[0001] The invention relates to the technical field of welding positioners, in particular to a welding positioner for a steel structure component. Background Art

[0002] The welding positioner for steel structure components, namely the welding positioner, is an important equipment in the field of welding processing technology for steel structure components. By using the cooperation between the welding positioner and the intelligent robot, welding operations that previously required a lot of manual participation can be completed efficiently, realizing an automated welding workflow.

[0003] Traditional welding positioners usually consist of core components such as mobile tracks, stable support seats, and flexible clamping mechanisms. In actual operation, the operator will first use the flexibility of the mobile track to accurately adjust the two support seats to the best position for the current welding task. Then, the steel structure component will be carefully lowered from the opening above the clamping mechanism until it falls smoothly inside the clamping mechanism. Once the steel structure component is correctly placed, the clamping mechanism will quickly and firmly clamp the two ends of the steel structure component to ensure its stability during the welding process. At this time, the intelligent robot can start to perform the welding task. In addition, through the precise rotation design of the clamping mechanism, it is easy to achieve a smooth rotation of 180 degrees of the steel structure component, and realize the change of the position of the steel structure component, which not only greatly improves the flexibility and efficiency of welding, but also makes welding work faster and more convenient.

[0004] As in the prior art, a utility model patent with authorization announcement number CN217750154U discloses an open-type positioner mechanism, which relates to the field of equipment manufacturing technology, including a chuck support seat component, a positioner mobile platform, a support component, and an operating platform component. The support component is arranged on the positioner mobile platform, and the chuck support seat component is arranged on the support component. It also includes a U-shaped chuck component. The U-shaped chuck component is arranged on the chuck support seat component, including a U-shaped disc and a tooling fixture. The U-shaped disc is a disc-shaped structure with a U-shaped opening in the middle and is symmetrical along the center line of the U-shaped opening. The tooling fixture is arranged at the bottom, left, and right positions of the inner ring of the positioner. A driving gear ring is provided on the U-shaped disc, and the driving gear ring drives the U-shaped disc and the workpiece to rotate through a driving motor and a reducer.

[0005] Although the positioner in the above patent realizes the automatic flipping function and improves the welding production efficiency, the existing welding positioner has certain defects when in use; during the use of the existing welding positioner, the welding slag generated during the welding process will fall on the moving track, and the accumulation of welding slag may have a negative impact on the accuracy, smoothness and service life of the guide rail, thereby affecting the performance and accuracy of the welding positioner. Summary of the invention

[0006] In view of the deficiencies of the prior art, the present invention provides a welding displacement device for steel structure components to solve the problems raised by the background technology and prevent welding slag from affecting the operation of the welding displacement device.

[0007] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a welding displacement device for steel structure components, comprising a movable track and two support seats connected to the movable track, a shielding belt slidably connected to the surface of the movable track, the shielding belt is located between the two support seats, two ends of the shielding belt are respectively fixedly connected to the outer walls of the connecting roller and the winding roller, the connecting roller and the middle of the winding roller are both fixedly connected with a rotating shaft, two ends of the rotating shaft connected to the connecting roller are respectively rotatably connected with positioning blocks, two ends of the rotating shaft connected to the winding roller are respectively rotatably connected with connecting blocks, a clamping rod is fixedly connected between the two positioning blocks and between the two connecting blocks, one end of the rotating shaft connected to the winding roller is fixedly connected with a handle, a fixing component is connected to the support seat, and a cleaning component is connected to the side wall of the movable track.

[0008] Furthermore, the fixing component includes a snap-fit ​​buckle and a tension spring. Two symmetrically arranged movable grooves are provided on one side of the bottom of each support seat. A snap-fit ​​buckle is slidably connected in each movable groove. A tension spring is fixedly connected between the snap-fit ​​buckle and the inner wall of the movable groove. The end of the snap-fit ​​buckle away from the tension spring is snap-fitted to the snap-fit ​​rod.

[0009] Furthermore, the cleaning component includes a moving block, a connecting rod and a scraper. Two symmetrically arranged moving blocks are connected to the parts of the moving track close to the winding roller. A connecting rod is fixedly connected between the top ends of the two moving blocks. A scraper is fixedly connected to the lower surface of the connecting rod. The end of the scraper away from the winding roller is in contact with the surface of the shielding belt. Moving components are connected to both sides of the moving track, and a clamping component is connected inside the moving block.

[0010] Furthermore, the moving component includes a fixed block, a sliding rod, a threaded rod and a handle. Two fixed blocks are fixedly connected on both sides of the moving track. A sliding rod is fixedly connected between the two fixed blocks on the same side. The lower end of the moving block is slidably connected to the sliding rod. A threaded groove is provided on the surface of the moving block. A threaded rod is threadedly connected in the threaded groove. The lower end of the threaded rod is fitted with the outer wall of the sliding rod, and a handle is fixedly connected to the top of the threaded rod.

[0011] Furthermore, the clamping assembly includes a moving rod and a tightening spring. A sliding groove is opened on the side of the upper end of the moving block close to the moving track. The moving rod is fixedly connected in the sliding groove. The two ends of the moving rod are respectively slidably connected to a moving rod. A tightening spring is fixedly connected between the bottom surface of the two ends of the moving rod and the sliding groove.

[0012] Furthermore, a collecting box is fixedly connected to a side of the moving block away from the winding roller.

[0013] Furthermore, both positioning blocks are provided with mounting grooves, in which coil springs are fixedly connected, and both ends of the rotating shaft connected to the connecting roller are located in the mounting grooves and fixedly connected to the coil springs.

[0014] Furthermore, the shielding belt includes a base layer, a fire-resistant layer, a magnetic strip and a reinforcement strip. The two ends of the base layer are respectively fixedly connected to the connecting roller and the winding roller, the surface of the base layer is fixedly connected to the fire-resistant layer, the bottom surfaces on both sides of the base layer are fixedly connected to the magnetic strips, the magnetic strips are fitted to the two sides of the movable track, and a plurality of reinforcement strips are fixedly connected to the middle bottom surface of the base layer.

[0015] Compared with the prior art, the present invention has the following beneficial effects: (1) This type of steel structure welding displacement device uses the cooperation of the shielding belt, connecting roller and winding roller to provide a safe shielding space for the moving track, effectively preventing welding slag from falling on the moving track, thereby protecting the track surface from damage and extending the service life of the equipment. At the same time, the shielding belt also facilitates the cleaning of welding slag, preventing welding slag from falling into the gap of the moving track, which facilitates the cleaning work of the staff; (2) The handle and the winding roller cooperate with each other to realize the extension and movement of the shielding position of the shielding belt, thereby meeting the specific requirements of different welding operations for the shielding range and improving the flexibility and adaptability of the operation; (3) During the winding process, the scraper slides along the surface of the shielding tape, and uses its own hardness and sharpness to scrape the welding slag from the shielding tape, thereby scraping off the welding slag on the shielding tape to keep it clean and smooth, making it easier for the staff to centrally handle the welding slag, and further facilitating the staff to clean the welding slag; (4) Under the action of the tightening spring, the scraper can always keep in contact with the surface of the shielding belt, thereby effectively scraping off welding slag and impurities. The elastic action of the tightening spring can also adapt to the different concave and convex degrees and material changes on the surface of the shielding belt, ensuring that the scraper can maintain good contact and scraping effect under different conditions; (5) The refractory layer covers the surface of the base layer to prevent the shielding belt from burning or being damaged when it comes into contact with high-temperature welding slag. The refractory layer is made of materials with excellent refractory properties, such as ceramic fiber, aluminum silicate fiber, etc., to ensure that it can withstand use in high-temperature environments; (6) The magnetic strips are fixedly connected to the bottom surfaces of both sides of the base layer and fit in with both sides of the moving track, playing a role in positioning and fixing, ensuring that the shielding strip and the moving track remain in close contact, and preventing the shielding strip from shifting or falling off during movement; (7) The reinforcing strip can enhance the overall strength of the shielding belt and improve its tensile strength, so that the shielding belt can maintain structural integrity when subjected to large external forces or impacts, and is not prone to breakage or deformation. It is made of carbon fiber materials, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 It is a schematic diagram of a three-dimensional split cross-sectional structure of the support seat, the tension spring and the snap buckle of the present invention; Figure 3 It is a three-dimensional structural schematic diagram of the shielding belt, cleaning component, moving component and collecting box of the present invention; Figure 4 It is a schematic diagram of the three-dimensional cross-sectional structure of the winding roller, the shielding belt, the handle and the connecting block of the present invention; Figure 5 It is a schematic diagram of the three-dimensional cross-sectional structure of the connecting roller, the shielding belt, the positioning block and the rotating shaft of the present invention; Figure 6 It is a schematic diagram of the three-dimensional split cross-sectional structure of the positioning block and the coil spring of the present invention; Figure 7 It is a three-dimensional structural schematic diagram of the cleaning component, the moving component and the pressing component of the present invention; Figure 8 It is a schematic diagram of the three-dimensional split cross-sectional structure of the cleaning component, the moving component and the pressing component of the present invention; Fig. 9 It is a schematic diagram of the three-dimensional structure of the handle and the threaded rod of the present invention; Fig.10 for Figure 4 An enlarged three-dimensional cross-sectional structural diagram at A above; Fig.11 It is a schematic diagram of the three-dimensional structure of the tension spring and the snap buckle of the present invention.

[0017] In the figure: 1. moving track; 2. supporting seat; 3. shielding belt; 4. connecting roller; 5. winding roller; 6. connecting block; 7. snap-in rod; 8. moving groove; 9. snap-in buckle; 10. tension spring; 11. handle; 12. moving block; 13. connecting rod; 14. scraper; 15. slide groove; 16. moving rod; 17. tightening spring; 18. fixing block; 19. slide rod; 20. threaded groove; 21. threaded rod; 22. handle; 23. collecting box; 24. mounting groove; 25. coil spring; 26. positioning block; 27. rotating shaft; 28. base layer; 29. ​​refractory layer; 30. magnetic strip; 31. reinforcing strip. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0019] See also Figures 1 to 11The welding displacement device of the steel structure component comprises a movable track 1 and two support seats 2 connected to the movable track 1, a shielding belt 3 is slidably connected to the surface of the movable track 1, the shielding belt 3 is located between the two support seats 2, two ends of the shielding belt 3 are respectively fixedly connected to the outer walls of the connecting roller 4 and the winding roller 5, the connecting roller 4 and the middle of the winding roller 5 are fixedly connected with a rotating shaft 27, two ends of the rotating shaft 27 connected to the connecting roller 4 are respectively rotatably connected with positioning blocks 26, two ends of the rotating shaft 27 connected to the winding roller 5 are respectively rotatably connected with connecting blocks 6, a clamping rod 7 is fixedly connected between the two positioning blocks 26 and between the two connecting blocks 6, one end of the rotating shaft 27 connected to the winding roller 5 is fixedly connected with a handle 11, a fixing component is connected to the support seat 2, and a cleaning component is connected to the side wall of the movable track 1.

[0020] The steel structure component welding displacement device in the present invention, when using the welding displacement device to weld the steel structure component, the welding slag generated during the welding process will fall on the shielding belt 3, thereby preventing the welding slag from falling directly on the moving track 1, and preventing the welding slag from affecting the normal use of the moving track 1; the mutual cooperation of the shielding belt 3, the connecting roller 4 and the winding roller 5 is used to provide a safe shielding space for the moving track 1, effectively preventing the welding slag from falling on the moving track 1, thereby protecting the track surface from damage and extending the service life of the equipment. At the same time, the shielding belt 3 also facilitates the cleaning of the welding slag, preventing the welding slag from falling into the gap of the moving track 1, and bringing convenience to the cleaning work of the staff; the mutual cooperation of the handle 11 and the winding roller 5 can realize the extension and movement of the shielding position of the shielding belt 3, thereby meeting the specific requirements of different welding operations for the shielding range, and improving the flexibility and adaptability of the operation.

[0021] As a preferred technical solution of the present invention, the fixing component includes a snap-fit ​​buckle 9 and a tension spring 10. Two symmetrically arranged movable grooves 8 are provided on one side of the bottom of each support seat 2. A snap-fit ​​buckle 9 is slidably connected in each movable groove 8. A tension spring 10 is fixedly connected between the snap-fit ​​buckle 9 and the inner wall of the movable groove 8. The end of the snap-fit ​​buckle 9 away from the tension spring 10 is snap-fitted to the snap-fit ​​rod 7.

[0022] Specifically, through the cooperation between the snap-fit ​​buckle 9 and the tension spring 10, when the staff needs to remove the shielding tape 3, they only need to pull the snap-fit ​​buckles 9 on both sides outwards, and then remove the snap-fit ​​rod 7 from above, so that the winding roller 5 and the connecting roller 4 can be removed, thereby removing the shielding tape 3 for replacement or maintenance. During this process, no tools are required, which greatly saves operation time and labor costs; the tension spring 10 provides a restoring force for the snap-fit ​​buckle 9, so that the snap-fit ​​buckle 9 can quickly return to its original position when subjected to external force, thereby ensuring a tight snap-fit ​​with the snap-fit ​​rod 7, thereby improving the stability and reliability of the fixing assembly.

[0023] As a preferred technical solution of the present invention, the cleaning component includes a moving block 12, a connecting rod 13 and a scraper 14. Two symmetrically arranged moving blocks 12 are connected to the parts of the moving track 1 on both sides close to the winding roller 5. A connecting rod 13 is fixedly connected between the top ends of the two moving blocks 12. A scraper 14 is fixedly connected to the lower surface of the connecting rod 13. The end of the scraper 14 away from the winding roller 5 is in contact with the surface of the shielding belt 3. Moving components are connected to both sides of the moving track 1, and a clamping component is connected inside the moving block 12.

[0024] Specifically, when there is a lot of welding slag on the shielding tape 3, the staff rotates the winding roller 5 through the handle 11, and the shielding tape 3 will be gradually tightened. When the shielding tape 3 is in a taut state, the scraper 14 contacts the shielding tape 3, and then the staff continues to rotate to wind the shielding tape 3 onto the winding roller 5. During the winding process, the scraper 14 slides along the surface of the shielding tape 3, and uses its own hardness and sharpness to scrape the welding slag from the shielding tape 3, thereby scraping off the welding slag on the shielding tape 3 to keep it clean and smooth, which is convenient for the staff to centrally process the welding slag, and further brings convenience to the staff to clean the welding slag.

[0025] As a preferred technical solution of the present invention, the moving component includes a fixed block 18, a sliding rod 19, a threaded rod 21 and a handle 22. Two fixed blocks 18 are fixedly connected on both sides of the moving track 1, and a sliding rod 19 is fixedly connected between the two fixed blocks 18 on the same side. The lower end of the moving block 12 is slidably connected to the sliding rod 19. A threaded groove 20 is opened on the surface of the moving block 12, and a threaded rod 21 is connected to the inner thread of the threaded groove 20. The lower end of the threaded rod 21 is in contact with the outer wall of the sliding rod 19, and the top of the threaded rod 21 is fixedly connected to the handle 22.

[0026] Specifically, by using the slide bar 19, the position of the moving block 12 can be adjusted to ensure that the scraper 14 can be located close to the winding roller 5 in different welding scenarios; by using the handle 22 and the threaded rod 21, the lower end of the threaded rod 21 is tightly fitted with the outer wall of the slide bar 19, providing a fixing ability for the moving block 12 to ensure the stable position of the scraper 14.

[0027] As a preferred technical solution of the present invention, the clamping assembly includes a moving rod 16 and a tightening spring 17. A sliding groove 15 is provided on the side of the upper end of the moving block 12 close to the moving track 1. The moving rod 16 is fixedly connected in the sliding groove 15. The two ends of the moving rod 16 are respectively slidably connected to a moving rod 16. A tightening spring 17 is fixedly connected between the bottom surfaces of the two ends of the moving rod 16 and the sliding groove 15.

[0028] Specifically, under the action of the tightening spring 17, the scraper 14 can always maintain contact with the surface of the shielding strip 3, thereby effectively scraping off welding slag and impurities. The elastic action of the tightening spring 17 can also adapt to the different degrees of unevenness and material changes on the surface of the shielding strip 3, ensuring that the scraper 14 can maintain good contact and scraping effect under different conditions.

[0029] As a preferred technical solution of the present invention, a collecting box 23 is fixedly connected to the side of the moving block 12 away from the winding roller 5 .

[0030] Specifically, as the scraper 14 scrapes away the welding slag, the welding slag will be blocked on one side of the scraper 14. After the welding slag accumulates for a period of time, a part of the welding slag will fall to both sides along the scraper 14. At this time, the collection box 23 can effectively collect this part of the welding slag and impurities, which brings convenience to the subsequent cleaning work of the staff and avoids it from polluting the working environment.

[0031] As a preferred technical solution of the present invention, both positioning blocks 26 are provided with mounting grooves 24 , in which coil springs 25 are fixedly connected. Both ends of the rotating shaft 27 connected to the connecting roller 4 are located in the mounting grooves 24 and fixedly connected to the coil springs 25 .

[0032] Specifically, after completing the scraping of the welding slag, the staff releases the handle 11. At this time, under the action of the coil spring 25, the connecting roller 4 will reel in the other end of the shielding belt 3, so that the shielding belt 3 is reset and ready for the next welding slag collection work.

[0033] As a preferred technical solution of the present invention, the shielding strip 3 includes a base layer 28, a fire-resistant layer 29, a magnetic strip 30 and a reinforcement strip 31. The two ends of the base layer 28 are fixedly connected to the connecting roller 4 and the winding roller 5 respectively. The fire-resistant layer 29 is fixedly connected to the surface of the base layer 28. The bottom surfaces on both sides of the base layer 28 are fixedly connected to the magnetic strips 30. The magnetic strips 30 are in contact with the two sides of the movable track 1. A plurality of reinforcement strips 31 are fixedly connected to the bottom surface in the middle of the base layer 28.

[0034] Specifically, the base layer 28 is the main structure of the shielding belt 3, which carries the other layers and plays a connecting and supporting role. It is made of high-strength and wear-resistant materials to ensure its stability and durability during use, such as nylon, polyester fiber, etc.; the refractory layer 29 covers the surface of the base layer 28, which is used to prevent the shielding belt 3 from burning or being damaged when it contacts high-temperature welding slag. The refractory layer 29 uses materials with excellent refractory properties, such as ceramic fiber, aluminum silicate fiber, etc., to ensure that it can withstand use in high temperature environments; the magnetic strips 30 are fixedly connected to the bottom surfaces on both sides of the base layer 28, and fit with the two sides of the moving track 1, playing a positioning and fixing role, ensuring that the shielding belt 3 is in close contact with the moving track 1, and preventing the shielding belt 3 from shifting or falling off during movement; the reinforcing strip 31 can enhance the overall strength of the shielding belt 3, improve the tensile strength of the shielding belt 3, so that the shielding belt 3 can maintain structural integrity when subjected to large external forces or impacts, and is not prone to breakage or deformation. It is made of carbon fiber materials, etc.

[0035] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A steel structure member welding displacement device, comprising a movable track (1) and two support seats (2) connected to the movable track (1), characterized in that: The surface of the movable track (1) is slidably connected with a shielding belt (3), the shielding belt (3) is located between the two support seats (2), the two ends of the shielding belt (3) are respectively fixedly connected to the outer walls of the connecting roller (4) and the winding roller (5), the middle parts of the connecting roller (4) and the winding roller (5) are both fixedly connected with a rotating shaft (27), the two ends of the rotating shaft (27) connected to the connecting roller (4) are respectively rotatably connected with positioning blocks (26), the two ends of the rotating shaft (27) connected to the winding roller (5) are respectively rotatably connected with a connecting block (6), a clamping rod (7) is fixedly connected between the two positioning blocks (26) and between the two connecting blocks (6), one end of the rotating shaft (27) connected to the winding roller (5) is fixedly connected with a handle (11), a fixing component is connected to the support seat (2), and a cleaning component is connected to the side wall of the movable track (1).

2. The steel structure member welding displacement device according to claim 1, characterized in that: The fixing assembly comprises a snap-fit ​​buckle (9) and a tension spring (10); two symmetrically arranged movable grooves (8) are provided on one side of the bottom of each support seat (2); a snap-fit ​​buckle (9) is slidably connected in each movable groove (8); a tension spring (10) is fixedly connected between the snap-fit ​​buckle (9) and the inner wall of the movable groove (8); and one end of the snap-fit ​​buckle (9) away from the tension spring (10) is snap-fitted to the snap-fit ​​rod (7).

3. The steel structure member welding displacement device according to claim 2, characterized in that: The cleaning component comprises a moving block (12), a connecting rod (13) and a scraper (14); two symmetrically arranged moving blocks (12) are connected to the parts of the moving track (1) close to the winding roller (5); a connecting rod (13) is fixedly connected between the top ends of the two moving blocks (12); a scraper (14) is fixedly connected to the lower surface of the connecting rod (13); an end of the scraper (14) away from the winding roller (5) is in contact with the surface of the shielding belt (3); moving components are connected to both sides of the moving track (1); and a clamping component is connected inside the moving block (12).

4. The steel structure member welding displacement device according to claim 3, characterized in that: The moving assembly comprises a fixed block (18), a slide bar (19), a threaded rod (21) and a handle (22). Two fixed blocks (18) are fixedly connected to both sides of the moving track (1). A slide bar (19) is fixedly connected between the two fixed blocks (18) on the same side. The lower end of the moving block (12) is slidably connected to the slide bar (19). A threaded groove (20) is provided on the surface of the moving block (12). The threaded rod (21) is connected to the inner thread of the threaded groove (20). The lower end of the threaded rod (21) is in contact with the outer wall of the slide bar (19). The top of the threaded rod (21) is fixedly connected to the handle (22).

5. The steel structure member welding displacement device according to claim 4, characterized in that: The clamping assembly comprises a moving rod (16) and a tightening spring (17); a sliding groove (15) is provided on a side of the upper end of the moving block (12) close to the moving track (1); the moving rod (16) is fixedly connected in the sliding groove (15); the two ends of the moving rod (16) are respectively slidably connected to a moving rod (16); and tightening springs (17) are fixedly connected between the bottom surfaces of the two ends of the moving rod (16) and the sliding groove (15).

6. The steel structure member welding displacement device according to claim 5, characterized in that: A collecting box (23) is fixedly connected to the side of the moving block (12) away from the winding roller (5).

7. The steel structure member welding displacement device according to claim 6, characterized in that: Both positioning blocks (26) are provided with mounting grooves (24), and coil springs (25) are fixedly connected in the mounting grooves (24). Both ends of the rotating shaft (27) connected to the connecting roller (4) are located in the mounting grooves (24) and are fixedly connected to the coil springs (25).

8. The steel structure member welding displacement device according to claim 7, characterized in that: The shielding strip (3) comprises a base layer (28), a fire-resistant layer (29), a magnetic strip (30) and a reinforcing strip (31); the two ends of the base layer (28) are fixedly connected to the connecting roller (4) and the winding roller (5) respectively; the surface of the base layer (28) is fixedly connected to the fire-resistant layer (29); the bottom surfaces of both sides of the base layer (28) are fixedly connected to the magnetic strips (30); the magnetic strips (30) are in contact with the two sides of the moving track (1); and the middle bottom surface of the base layer (28) is fixedly connected to a plurality of reinforcing strips (31).

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