Welding displacement device for steel structural members

Abstract

This invention relates to the field of welding positioner technology and discloses a welding positioner device for steel structure components. The device includes a moving track and two support seats connected to the moving track. A shielding strip is slidably connected to the surface of the moving track, located between the two support seats. Both ends of the shielding strip are fixedly connected to the outer walls of a connecting roller and a take-up roller, respectively. A rotating shaft is fixedly connected to the middle of both the connecting roller and the take-up roller. Positioning blocks are rotatably connected to both ends of the rotating shaft connected to the connecting roller, and connecting blocks are rotatably connected to both ends of the rotating shaft connected to the take-up roller. A locking rod is fixedly connected between the two positioning blocks and between the two connecting blocks. A handle is fixedly connected to one end of the rotating shaft connected to the take-up roller. This welding positioner device for steel structure components, through the cooperation of the shielding strip, connecting roller, and take-up roller, provides a safe shielding space for the moving track, effectively preventing welding slag from falling onto the moving track.

Description

Technical Field

[0001] This invention relates to the field of welding positioner technology, specifically to welding positioner devices for steel structure components. Background Technology

[0002] Welding positioners for steel structure components, also known as welding positioners, are important equipment in the field of steel structure component welding processing technology. By utilizing the cooperation between welding positioners and intelligent robots, welding operations that previously required a large amount of manual intervention can be completed efficiently, realizing an automated welding workflow.

[0003] Traditional welding positioners typically consist of core components such as a moving track, stable support seats, and a flexible clamping mechanism. In actual operation, the operator first utilizes the flexibility of the moving track to precisely adjust the two support seats to the optimal position for the current welding task. Then, the steel structure component is carefully and slowly lowered from the opening above the clamping mechanism until it lands smoothly inside. Once the steel structure component is correctly positioned, the clamping mechanism quickly and firmly clamps both ends of the component, ensuring its stability during the welding process. At this point, the intelligent robot can begin performing the welding task. Furthermore, through the precise rotation design of the clamping mechanism, a smooth 180-degree rotation of the steel structure component can be easily achieved, enabling positional changes. This not only greatly improves the flexibility and efficiency of welding but also makes the welding work faster and more convenient.

[0004] For example, in the prior art, the utility model patent with authorization announcement number CN217750154U discloses an open-type positioner mechanism, which relates to the field of equipment manufacturing technology. It includes a chuck support base component, a positioner moving platform, a support component, and an operating platform component. The support component is set on the positioner moving platform, and the chuck support base component is set on the support component. It also includes a U-shaped chuck component, which is set on the chuck support base component and includes 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 about the center line of the U-shaped opening. The tooling fixture is set in the lower, left, and right positions of the inner ring of the positioner. The U-shaped disc is provided with a drive gear ring, which drives the U-shaped disc and the workpiece to rotate through a drive motor and a reducer.

[0005] Although the positioner in the aforementioned patent achieves automatic flipping function and improves welding production efficiency, existing welding positioners have certain defects in use. During the use of existing welding positioners, welding slag generated during the welding process falls onto the moving track. The accumulation of welding slag may negatively affect 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] To address the shortcomings of existing technologies, this invention provides a welding displacement device for steel structure components, thereby solving the problems mentioned in the background art and preventing welding slag from affecting the operation of the welding displacement device.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a steel structure component welding displacement device, comprising a moving track and two support seats connected to the moving track, a shielding strip slidably connected to the surface of the moving track, the shielding strip being located between the two support seats, the two ends of the shielding strip being fixedly connected to the outer walls of the connecting roller and the take-up roller respectively, a rotating shaft being fixedly connected to the middle of both the connecting roller and the take-up roller, positioning blocks being rotatably connected to the two ends of the rotating shaft connected to the connecting roller respectively, connecting blocks being rotatably connected to the two ends of the rotating shaft connected to the take-up roller respectively, a locking rod being fixedly connected between the two positioning blocks and between the two connecting blocks, a handle being fixedly connected to one end of the rotating shaft connected to the take-up roller, a fixing component being connected to the support seat, and a cleaning component being connected to the side wall of the moving track.

[0008] Furthermore, the fixing component includes a snap-fit ​​buckle and a tension spring. Each support base has two symmetrically arranged moving slots on one side of its bottom. A snap-fit ​​buckle is slidably connected in each moving slot. A tension spring is fixedly connected between the snap-fit ​​buckle and the inner wall of the moving slot. The end of the snap-fit ​​buckle away from the tension spring is snapped into the snap-fit ​​rod.

[0009] Furthermore, the cleaning assembly includes a moving block, a connecting rod, and a scraper. Two symmetrically arranged moving blocks are connected to the sides of the moving track near the take-up roller. A connecting rod is fixedly connected between the tops 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 take-up roller is in contact with the surface of the shielding strip. Moving components are connected to both sides of the moving track. A pressing component is connected inside the moving block.

[0010] Furthermore, the moving component includes a fixed block, a slide rod, a threaded rod, and a handle. Two fixed blocks are fixedly connected to both sides of the moving track. A slide 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 slide rod. A threaded groove is opened on the surface of the moving block. A threaded rod is threadedly connected in the threaded groove. The lower end of the threaded rod fits against the outer wall of the slide rod. 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 groove is provided on the upper end of the moving block near the moving track. A moving rod is fixedly connected in the groove. Both ends of the moving rod are slidably connected to a moving rod. A tightening spring is fixedly connected between the bottom surface of both ends of the moving rod and the groove.

[0012] Furthermore, a collection box is fixedly connected to the side of the moving block away from the take-up roller.

[0013] Furthermore, each of the two positioning blocks has an installation groove, and a coil spring is fixedly connected in the installation groove. Both ends of the rotating shaft connected to the connecting roller are located in the installation groove and are fixedly connected to the coil spring.

[0014] Furthermore, the shielding strip includes a base layer, a fire-resistant layer, magnetic strips, and reinforcing strips. The two ends of the base layer are fixedly connected to the connecting roller and the winding roller, respectively. The fire-resistant layer is fixedly connected to the surface of the base layer. Magnetic strips are fixedly connected to the bottom surfaces of both sides of the base layer. The magnetic strips are in contact with the sides of the moving track. Multiple reinforcing strips are fixedly connected to the bottom surface of the middle part of the base layer.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] (1) This steel structure component welding displacement device utilizes the cooperation of 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, and facilitating the cleaning work of the staff.

[0017] (2) By utilizing the cooperation between the handle and the take-up roller, the position of the shielding belt can be extended and moved, thereby meeting the specific requirements of different welding operations for the shielding range and improving the flexibility and adaptability of operation.

[0018] (3) During the winding process, the scraper slides along the surface of the shielding strip and uses its own hardness and sharpness to scrape the welding slag off the shielding strip, thereby scraping off the welding slag on the shielding strip, keeping it clean and smooth, making it easier for workers to centrally process the welding slag, and further facilitating the cleaning of welding slag by workers.

[0019] (4) Under the action of the tightening spring, the scraper can always keep in contact with the surface of the shielding strip, thereby effectively scraping off welding slag and impurities. The elasticity of the tightening spring can also adapt to different unevenness and material changes on the surface of the shielding strip, ensuring that the scraper can maintain good contact and scraping effect under different conditions.

[0020] (5) The fire-resistant layer is covered on the surface of the base layer to prevent the shielding strip from burning or being damaged when it comes into contact with high-temperature welding slag. The fire-resistant layer is made of materials with excellent fire resistance, such as ceramic fiber and aluminum silicate fiber, to ensure that it can withstand the use in high-temperature environments.

[0021] (6) The magnetic strip is fixedly connected to the bottom of both sides of the base layer and fits against both sides of the moving track to play a positioning and fixing role, ensuring that the shielding strip and the moving track are kept in close contact, and preventing the shielding strip from shifting or falling off during the movement.

[0022] (7) The reinforcing strip can enhance the overall strength of the shielding strip and improve its tensile strength, so that the shielding strip can maintain its 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. Attached Figure Description

[0023] Figure 1 This is a three-dimensional structural diagram of the entire invention;

[0024] Figure 2 This is a three-dimensional split cross-sectional view of the support base, tension spring and snap fastener of the present invention.

[0025] Figure 3 This is a three-dimensional structural diagram of the shielding strip, cleaning component, moving component, and collection box of the present invention;

[0026] Figure 4 This is a three-dimensional cross-sectional structural diagram of the winding roller, shielding belt, handle, and connecting block of the present invention;

[0027] Figure 5 This is a three-dimensional cross-sectional view of the connecting roller, shielding belt, positioning block and rotating shaft of the present invention;

[0028] Figure 6 This is a three-dimensional sectional view of the positioning block and coil spring of the present invention.

[0029] Figure 7 This is a three-dimensional structural diagram of the cleaning component, moving component, and clamping component of the present invention;

[0030] Figure 8 This is a three-dimensional sectional view of the cleaning component, moving component, and clamping component of the present invention.

[0031] Figure 9 This is a three-dimensional structural diagram of the grip and threaded rod of the present invention;

[0032] Figure 10 for Figure 4 Enlarged 3D cross-sectional view of point A above;

[0033] Figure 11 This is a three-dimensional structural diagram of the tension spring and snap fastener of the present invention.

[0034] In the diagram: 1. Moving track; 2. Support base; 3. Shielding strip; 4. Connecting roller; 5. Rewinding roller; 6. Connecting block; 7. Clip rod; 8. Moving groove; 9. Clip buckle; 10. Tension spring; 11. Handle; 12. Moving block; 13. Connecting rod; 14. Scraper; 15. Slide groove; 16. Moving rod; 17. Tensioning spring; 18. Fixing block; 19. Slide rod; 20. Threaded groove; 21. Threaded rod; 22. Handle; 23. Collection box; 24. Mounting groove; 25. Coil spring; 26. Positioning block; 27. Rotating shaft; 28. Base layer; 29. ​​Fire-resistant layer; 30. Magnetic strip; 31. Reinforcing strip. Detailed Implementation

[0035] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0036] Please see Figures 1 to 11 A steel structure component welding displacement device includes a moving track 1 and two support seats 2 connected to the moving track 1. A shielding strip 3 is slidably connected to the surface of the moving track 1. The shielding strip 3 is located between the two support seats 2. The two ends of the shielding strip 3 are fixedly connected to the outer walls of the connecting roller 4 and the take-up roller 5, respectively. A rotating shaft 27 is fixedly connected to the middle of the connecting roller 4 and the take-up roller 5. The two ends of the rotating shaft 27 connected to the connecting roller 4 are rotatably connected to positioning blocks 26, and the two ends of the rotating shaft 27 connected to the take-up roller 5 are rotatably connected to connecting blocks 6. A locking rod 7 is fixedly connected between the two positioning blocks 26 and between the two connecting blocks 6. A handle 11 is fixedly connected to one end of the rotating shaft 27 connected to the take-up roller 5. A fixing component is connected to the support seat 2, and a cleaning component is connected to the side wall of the moving track 1.

[0037] The steel structure component welding displacement device of this invention ensures that during the welding of steel structure components, the welding slag generated during the welding process falls onto the shielding belt 3, thus preventing the welding slag from falling directly onto the moving track 1 and affecting its normal use. The shielding belt 3, connecting roller 4, and take-up roller 5 work together to provide a safe shielding space for the moving track 1, effectively preventing welding slag from falling onto it, protecting the track surface from damage, and extending the service life of the equipment. Simultaneously, the shielding belt 3 facilitates the cleaning of welding slag, preventing it from falling into the gaps of the moving track 1, thus simplifying the cleaning work for operators. The handle 11 and take-up roller 5 work together to extend, retract, and move the shielding position of the shielding belt 3, thereby meeting the specific requirements of different welding operations for the shielding range and improving operational flexibility and adaptability.

[0038] As a preferred technical solution of the present invention, the fixing component includes a snap fastener 9 and a tension spring 10. Two symmetrically arranged movable grooves 8 are opened on one side of the bottom of each support base 2. A snap fastener 9 is slidably connected in each movable groove 8. A tension spring 10 is fixedly connected between the snap fastener 9 and the inner wall of the movable groove 8. The end of the snap fastener 9 away from the tension spring 10 is snapped with the snap rod 7.

[0039] Specifically, through the cooperation of the snap-fit ​​buckle 9 and the tension spring 10, when the operator needs to remove the shielding strip 3, they only need to pull the snap-fit ​​buckles 9 on both sides outward, and then remove the snap-fit ​​rod 7 from above. This allows the take-up roller 5 and the connecting roller 4 to be removed, thus removing the shielding strip 3 for replacement or maintenance. This process does not require the use of any tools, greatly saving operation time and labor costs. The tension spring 10 provides a restoring force for the snap-fit ​​buckle 9, enabling the snap-fit ​​buckle 9 to quickly return to its original position when subjected to external force, thereby ensuring a tight snap-fit ​​with the snap-fit ​​rod 7 and improving the stability and reliability of the fixing components.

[0040] 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 near the take-up 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 take-up 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 pressing component is connected inside the moving block 12.

[0041] Specifically, when there is a lot of welding slag on the shielding belt 3, the worker rotates the take-up roller 5 by holding the handle 11. At this time, the shielding belt 3 will be gradually tightened. When the shielding belt 3 is in a taut state, the scraper 14 contacts the shielding belt 3. Then the worker continues to rotate, and the shielding belt 3 is rolled up onto the take-up roller 5. During the winding process, the scraper 14 slides along the surface of the shielding belt 3. Using its own hardness and sharpness, it scrapes the welding slag off the shielding belt 3, thereby removing the welding slag on the shielding belt 3, keeping it clean and smooth, and making it easier for the worker to centrally process the welding slag, which further facilitates the worker's cleaning of welding slag.

[0042] As a preferred technical solution of the present invention, the moving component includes a fixed block 18, a slide rod 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 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 slide rod 19. A threaded groove 20 is opened on the surface of the moving block 12. A threaded rod 21 is threadedly connected in the threaded groove 20. The lower end of the threaded rod 21 is in contact with the outer wall of the slide rod 19. A handle 22 is fixedly connected to the top end of the threaded rod 21.

[0043] 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 positioned close to the take-up 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 in close contact with the outer wall of the slide bar 19, providing a fixing ability for the moving block 12 and ensuring the stability of the scraper 14.

[0044] As a preferred technical solution of the present invention, the clamping assembly includes a moving rod 16 and a tightening spring 17. A groove 15 is provided on the upper end of the moving block 12 near the moving track 1. The moving rod 16 is fixedly connected in the groove 15. The two ends of the moving rod 16 are slidably connected to a moving rod 16. A tightening spring 17 is fixedly connected between the bottom surface of the two ends of the moving rod 16 and the groove 15.

[0045] Specifically, under the action of the tightening spring 17, the scraper 14 can always remain in contact with the surface of the shielding strip 3, thereby effectively scraping off welding slag and impurities. The elasticity of the tightening spring 17 can also adapt to different 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.

[0046] As a preferred embodiment of the present invention, a collection box 23 is fixedly connected to the side of the movable block 12 away from the winding roller 5.

[0047] Specifically, as the scraper 14 removes the welding slag, the slag is blocked on one side of the scraper 14. After the welding slag accumulates for a period of time, some 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 polluting the working environment.

[0048] As a preferred technical solution of the present invention, each of the two positioning blocks 26 is provided with a mounting groove 24, and a coil spring 25 is fixedly connected in the mounting groove 24. Both ends of the rotating shaft 27 connected to the connecting roller 4 are located in the mounting groove 24 and are fixedly connected to the coil spring 25.

[0049] Specifically, after the welding slag is scraped off, the worker releases the handle 11. At this time, under the action of the coil spring 25, the connecting roller 4 will rewind the other end of the shielding strip 3, thereby resetting the shielding strip 3 and preparing it for the next welding slag removal operation.

[0050] 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 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 fire-resistant layer 29 is fixedly connected to the surface of the base layer 28. Magnetic strips 30 are fixedly connected to the bottom surfaces of both sides of the base layer 28. The magnetic strips 30 are in contact with the two sides of the moving track 1. Multiple reinforcing strips 31 are fixedly connected to the bottom surface of the middle part of the base layer 28.

[0051] Specifically, the base layer 28 is the main structure of the shielding strip 3, bearing the other layers and serving as a connection and support. It is made of high-strength, wear-resistant materials to ensure its stability and durability during use, such as nylon and polyester fiber. The fire-resistant layer 29 covers the surface of the base layer 28 to prevent the shielding strip 3 from burning or being damaged when in contact with high-temperature welding slag. The fire-resistant layer 29 uses materials with excellent fire resistance, such as ceramic fiber and aluminosilicate fiber, to ensure that it can withstand use in high-temperature environments. The magnetic strips 30 are fixedly connected to the bottom surfaces of both sides of the base layer 28 and fit against both sides of the moving track 1, serving as positioning and fixing functions to ensure that the shielding strip 3 remains tightly attached to the moving track 1, preventing the shielding strip 3 from shifting or falling off during movement. The reinforcing strips 31 enhance the overall strength of the shielding strip 3 and improve its tensile strength, enabling the shielding strip 3 to maintain structural integrity when subjected to large external forces or impacts, and is not prone to breakage or deformation. They are made of materials such as carbon fiber.

[0052] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A welding displacement device for steel structure components, comprising a moving track (1) and two support seats (2) connected to the moving track (1), characterized in that, The surface of the moving track (1) is slidably connected with a shielding strip (3), which is located between two support seats (2). The two ends of the shielding strip (3) are fixedly connected to the outer walls of the connecting roller (4) and the take-up roller (5), respectively. The middle of the connecting roller (4) and the take-up 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 take-up roller (5) are respectively rotatably connected with connecting blocks (6). The two positioning blocks (26) and the two connecting blocks (6) are both fixedly connected with a snap-fit ​​rod (7). One end of the rotating shaft (27) connected to the take-up roller (5) is fixedly connected with a handle (11). The support seat (2) is connected with a fixing component. The side wall of the moving track (1) is connected with a cleaning component. The cleaning assembly includes a moving block (12), a connecting rod (13), and a scraper (14). Two symmetrically arranged moving blocks (12) are connected to the sides of the moving track (1) near the take-up 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 take-up roller (5) is in contact with the surface of the shielding strip (3). Moving components are connected to both sides of the moving track (1). A pressing component is connected inside the moving block (12). The shielding strip (3) includes 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 fire-resistant layer (29) is fixedly connected to the surface of the base layer (28). Magnetic strips (30) are fixedly connected to the bottom surfaces on both sides of the base layer (28). The magnetic strips (30) are attached to both sides of the moving track (1). Multiple reinforcing strips (31) are fixedly connected to the bottom surface in the middle of the base layer (28). The base layer is the main structure of the shielding strip, bearing the weight of the other layers and serving as a connection and support. It is made of high-strength, wear-resistant materials to ensure its stability and durability during use, such as nylon and polyester fiber. A fire-resistant layer covers the surface of the base layer to prevent the shielding strip from burning or being damaged when in contact with high-temperature welding slag. The fire-resistant layer uses materials with excellent fire resistance, such as ceramic fiber and aluminosilicate fiber, to ensure it can withstand high-temperature environments. Magnetic strips are fixedly connected to the bottom sides of the base layer, fitting snugly against the sides of the moving track, serving a positioning and fixing function, ensuring the shielding strip remains tightly attached to the moving track and preventing it from shifting or falling off during movement. Reinforcing strips enhance the overall strength of the shielding strip and improve its tensile strength, allowing it to maintain structural integrity and resist breakage or deformation when subjected to significant external forces or impacts. These strips are made of carbon fiber. The moving component includes a fixed block (18), a slide rod (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 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 slide rod (19). A threaded groove (20) is opened on the surface of the moving block (12). A threaded rod (21) is threadedly connected in the threaded groove (20). The lower end of the threaded rod (21) is in contact with the outer wall of the slide rod (19). A handle (22) is fixedly connected to the top end of the threaded rod (21).

2. The steel structure component welding displacement device according to claim 1, characterized in that, The fixing component includes a snap-fit ​​buckle (9) and a tension spring (10). Each support base (2) has two symmetrically arranged moving slots (8) on one side of its bottom. A snap-fit ​​buckle (9) is slidably connected in each moving slot (8). A tension spring (10) is fixedly connected between the snap-fit ​​buckle (9) and the inner wall of the moving slot (8). The end of the snap-fit ​​buckle (9) away from the tension spring (10) is snapped into the snap-fit ​​rod (7).

3. The steel structure component welding displacement device according to claim 2, characterized in that, The clamping assembly includes a moving rod (16) and a tightening spring (17). A groove (15) is provided on the upper end of the moving block (12) near the moving track (1). The moving rod (16) is fixedly connected in the groove (15). The two ends of the moving rod (16) are slidably connected to a moving rod (16) respectively. The bottom surfaces of both ends of the moving rod (16) are fixedly connected to the groove (15) with tightening springs (17).

4. The steel structure component welding displacement device according to claim 3, characterized in that, The moving block (12) is fixedly connected to a collection box (23) on the side away from the winding roller (5).

5. The steel structure component welding displacement device according to claim 4, characterized in that, Both of the positioning blocks (26) have mounting grooves (24) inside, and coil springs (25) are fixedly connected inside the mounting grooves (24). The two ends of the rotating shaft (27) connected to the connecting roller (4) are located inside the mounting grooves (24) and are fixedly connected to the coil springs (25).

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