A conveying mechanism applicable to variable-diameter continuous winding

Abstract

A conveying mechanism applicable to continuous winding of variable diameter pipes is disclosed. This invention addresses the problems of low efficiency and high cost in the fabrication of composite material pipes, which require constant replacement of the winding mold during the manufacturing process. The fixing mechanism of this invention includes a large indexing plate and a connecting plate, with the connecting plate installed in the middle of the outer end face of the large indexing plate. The lifting mechanism includes a drive unit and two sets of telescopic units. Both ends of the drive unit are connected to a set of telescopic units. Multiple support mechanisms are mounted circumferentially on the telescopic units, and these support mechanisms support the composite material pipe mold under the action of the telescopic units. The front end of the conveying mechanism is inserted into the large indexing plate of the fixing mechanism. The conveying mechanism, along with the drive unit and telescopic units of the lifting mechanism, jointly drives the lifting and lowering of the support mechanisms, and the conveying mechanism provides conveying power to the support mechanisms. This invention is used for the fabrication of composite material pipes.

Description

Technical Field

[0001] This invention relates to a conveying mechanism, and more specifically to a conveying mechanism applicable to variable-diameter continuous winding. Background Technology

[0002] With the rapid development of modern society, urban underground pipe networks have spread to every part of the city, forming an important part of water conservancy, municipal engineering, and new infrastructure construction. These pipes are buried deep underground, making real-time observation and maintenance impossible. The underground environment where pipes are laid is extremely complex, posing significant challenges to pipe laying and repair. Pipeline laying and maintenance construction have a certain impact on urban construction and aesthetics. Replacing and repairing old and damaged pipes not only involves huge costs but also has a certain impact on the urban environment and society. For busy urban traffic areas, historical sites, cultural buildings, vegetation protection areas, and locations such as highways and railways where surface repairs are not feasible, composite materials are widely used due to their excellent corrosion resistance and wear resistance. Therefore, using composite material pipes for underground pipe repair has become a more convenient, reliable, and faster maintenance method, reducing damage to protected areas and protecting areas where surface excavation is inconvenient.

[0003] In the manufacturing process of existing composite material pipes, yarn needs to be wound around the pipe to ensure its strength. However, since the diameter of composite material pipes is not constant and varies depending on the application environment, conventional composite material pipes cannot be continuously wound when the diameter changes during the winding process. Different conveying mechanisms are required, which brings inconvenience to the manufacturing of composite material pipes.

[0004] In summary, existing composite material pipes suffer from low manufacturing efficiency and high cost because they cannot be used for winding variable diameter pipes and require constant replacement of winding molds. Summary of the Invention

[0005] The purpose of this invention is to address the problems of low efficiency and high cost in the fabrication of composite material pipes, which are unsuitable for winding variable-diameter pipes and require frequent changes of winding molds. Therefore, this invention provides a conveying mechanism suitable for continuous winding of variable-diameter pipes.

[0006] The technical solution of the present invention is as follows: A conveying mechanism applicable to variable diameter continuous winding includes a lifting mechanism, a fixing mechanism, a conveying mechanism, and multiple supporting mechanisms. The fixing mechanism includes a large indexing plate and a connecting plate, with the connecting plate installed in the middle of the outer end face of the large indexing plate. The lifting mechanism includes a driving unit and two sets of telescopic units. The two ends of the driving unit are respectively connected to a set of telescopic units. Multiple supporting mechanisms are installed on the telescopic units in the circumferential direction, and the supporting mechanisms support the composite material pipe under the action of the telescopic units. The front end of the conveying mechanism is inserted into the large indexing plate of the fixing mechanism. The conveying mechanism, together with the driving unit and telescopic units of the lifting mechanism, jointly drive the lifting and lowering of the supporting mechanism, and the conveying mechanism provides conveying power to the supporting mechanism.

[0007] Furthermore, the conveying mechanism includes a servo motor, a reducer, a vertical plate, a main shaft, a large helical gear, a fixed block, a small helical gear, a cylindrical gear, a spur gear, and multiple linkage transmission units. The cylindrical gear and the large helical gear are coaxially mounted on the main shaft. The upper part of the fixed block is inserted into a groove at the bottom of the large indexing plate. The small helical gear is rotatably mounted on the lower part of the fixed block and meshes with the large helical gear. The output shaft of the servo motor is connected to the reducer. The reducer is installed parallel to the main shaft through the vertical plate. The output shaft of the reducer is connected to the spur gear, which meshes with the cylindrical gear. Multiple linkage transmission units are arranged in a circular array on the outer circumference of the main shaft. One end of each linkage transmission unit is connected to the gear shaft of the small helical gear on the fixed block, and the other end of each linkage transmission unit is connected to the conveying mechanism and provides conveying power to the conveying mechanism.

[0008] Furthermore, the linkage transmission unit includes an upper linkage, a lower linkage, a sprocket, a chain, a tensioning seat, and a retaining ring. One end of the lower linkage is rotatably connected to both ends of the gear shaft of the small helical gear. The sprocket is installed on one side of the gear shaft of the small helical gear, and the retaining ring is installed at the end of the gear shaft of the small helical gear. The other end of the lower linkage is rotatably connected to one end of the upper linkage. A sprocket is installed on each side of the shaft at one end of the upper linkage, and the retaining ring is installed at the end of the shaft. The sprocket on the right side of the lower linkage is connected to the sprocket on the right side of one end of the upper linkage via a chain. The sprocket on the left side of one end of the upper linkage is connected to the sprocket on the left side of the other end of the upper linkage via a chain. The shaft on the sprocket at the other end of the upper linkage is coaxial with the drive shaft of the conveying mechanism.

[0009] Preferably, the number of linkage transmission units is 6, 8, or 10.

[0010] Furthermore, the driving unit of the lifting mechanism includes a drive motor and a T-type reducer. The drive motor is connected to the input end of the T-type reducer, and the two ends of the T-type reducer are respectively connected to a telescopic unit.

[0011] Furthermore, the telescopic unit includes a coupling, a lead screw fixing seat, a linerless spacer, a guide rail plate, a small indexing plate, a lead screw, and multiple lifting components. The output shaft of the T-type reducer is connected to the lead screw via the coupling. The lead screw fixing seat is installed on the outside of the coupling. The guide rail plate is arranged coaxially with the main shaft. The linerless spacer is installed in the middle of the guide rail plate. The main shaft passes through the linerless spacer and the guide rail plate. The lead screw passes through the lead screw fixing seat and the guide rail plate. A small indexing plate is installed at the tail of the lead screw. The small indexing plate is connected to the conveying mechanism via multiple lifting components arranged in a circle.

[0012] Furthermore, each lifting component includes a slide block, a guide rail, a rotating shaft, a lifting seat, and a lifting linkage. The guide rail is installed on the guide rail disc along the radial direction of the guide rail disc. The slide block is slidably installed on the guide rail. One end of the lifting linkage is rotatably connected to the small indexing disc through the rotating shaft. The middle part of the lifting linkage is connected to the slide block. The other end of the lifting linkage is connected to the conveying mechanism through the lifting seat.

[0013] Furthermore, the support mechanism includes a bearing housing, a liner, a timing belt, a sliding rod, and two pulleys. The pulleys are installed at both ends of the sliding rod, and a bearing housing is installed at each end of each pulley. The two timing pulleys are connected by a timing belt, and the liner is installed on the side end face of the sliding rod.

[0014] Compared with the prior art, the present invention has the following advantages:

[0015] 1. The present invention has a compact structure and is easy to operate;

[0016] The variable diameter continuous winding conveying mechanism of this invention uses a lifting mechanism and a synchronous belt conveyor support to support and wind composite material pipe molds. The overall structure is compact, consisting of a lifting mechanism, a conveying structure, and a slide rail fixed support. Furthermore, by controlling the expansion and contraction of composite material pipe molds with different apertures through servo motor program control, the molds can be easily and quickly replaced, improving work efficiency.

[0017] 2. This invention can use composite material pipe models with different aperture sizes, thus having a wider range of applications;

[0018] This invention relates to a lifting mechanism device for a variable-diameter continuous winding conveying mechanism, which consists of a servo motor, reducer, lifting seat, lifting linkage, slide block, slide rail, rotating shaft, guide rail disc, and other parts. The lifting linkage drives the synchronous belt to move radially, which can meet the support requirements of composite material pipe molds with different apertures during composite material pipe winding, and increases the application range of different composite material pipe molds.

[0019] 3. This invention can realize biaxial linkage feeding and winding of composite material pipes, and can realize diameter variation during the winding of composite material pipes;

[0020] In the fiber winding process of composite pipes, the composite pipe mold is mounted on the conveying mechanism. As the winding process of the composite pipe mold proceeds, the conveying mechanism and lifting mechanism of the variable diameter continuous winding conveying mechanism complete the continuous variable diameter fiber winding of the composite pipe mold in the axial and radial directions. According to the characteristics of the composite pipe, the composite pipe mold is supported by a synchronous belt. It is also possible to change the winding aperture of the composite pipe product during the winding process, so as to wind composite pipes with different apertures on the same composite pipe product.

[0021] 4. This invention enables ultra-long winding of composite material pipe products;

[0022] The variable diameter continuous winding conveying mechanism of the present invention uses a conveying mechanism and a synchronous belt to convey and support the composite material pipe mold. Multiple variable diameter continuous winding conveying mechanisms can be used to support and convey ultra-long composite material pipe molds, thereby realizing fiber winding of ultra-long composite material pipe products. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0024] Figure 2 This is a schematic diagram showing the connection relationship between the main shaft 3, guide rail disk 21, slide rail block 13 and guide rail 20 of the present invention.

[0025] Figure 3 This is a side view of the present invention.

[0026] Figure 4 This is a structural diagram of the support mechanism. Detailed Implementation

[0027] Specific implementation method one: Combining Figures 1 to 4 This embodiment describes a conveying mechanism applicable to variable-diameter continuous winding, comprising a lifting mechanism, a fixing mechanism, a conveying mechanism, and multiple support mechanisms. The fixing mechanism includes a large indexing plate 1 and a connecting plate 2, with the connecting plate 2 installed in the middle of the outer end face of the large indexing plate 1. The lifting mechanism includes a drive unit and two sets of telescopic units, with each end of the drive unit connected to one set of telescopic units. Multiple support mechanisms are installed on the telescopic units in the circumferential direction, and the support mechanisms support the composite material pipe under the action of the telescopic units. The front end of the conveying mechanism is inserted into the large indexing plate 1 of the fixing mechanism. The conveying mechanism, together with the drive unit and telescopic units of the lifting mechanism, jointly drive the lifting and lowering of the support mechanisms, and the conveying mechanism provides conveying power to the support mechanisms.

[0028] The variable diameter continuous winding conveying mechanism of the present invention consists of a large indexing plate 1 bolted to a frame, a main shaft 3 passing through the large indexing plate 1 and connected to a connecting plate, and fixed to the large indexing plate 1 by bolts; a servo motor 11 and a reducer 10 are fixed to the main shaft 3 by a vertical plate 30. After the servo motor 11 is reduced in speed by the reducer 10, its extended shaft end is connected to a spur gear 32. The spur gear 32 meshes with a cylindrical gear 31 for transmission. The cylindrical gear 31 is bolted to a large helical gear 4 and fixedly connected to the main shaft 3 by a key. The servo motor 11 drives the spur gear 32 to rotate, transmitting power through the meshing of the cylindrical gear 31 and the large helical gear 4. The rotation of helical gear 4 drives the rotation of small helical gear 6, which in turn drives the lower connecting rod 29 and the upper connecting rod 26 to move. The lower connecting rod 29, the rotating shaft 19, and the upper connecting rod 26 form a lifting connecting rod component to complete the vertical and main shaft direction movement of the variable diameter continuous winding conveying mechanism. The end of the rotating shaft 19 is connected to the sprocket 7, and the sprocket is fixed by the fixing ring 28. The rolling bearing restricts the position of the sprocket 7 and the chain 8 during movement. The sprocket transmits power to drive the synchronous pulley 9 to rotate, which in turn drives the synchronous belt 14 to move along the axial direction, thereby realizing the movement of the composite material pipeline along the axial direction.

[0029] Specific Implementation Method Two: Combining Figure 1 and Figure 4 This embodiment describes a conveying mechanism comprising a servo motor 11, a reducer 10, a vertical plate 30, a main shaft 3, a large helical gear 4, a fixed block 5, a small helical gear 6, a cylindrical gear 31, a spur gear 32, and multiple linkage transmission units. The cylindrical gear 31 and the large helical gear 4 are coaxially mounted on the main shaft 3. The upper part of the fixed block 5 is inserted into a groove at the bottom of the large indexing plate 1. The small helical gear 6 is rotatably mounted on the lower part of the fixed block 5 and meshes with the large helical gear 4. The output shaft of the servo motor 11 is connected to the reducer 10. The reducer 10 is mounted parallel to the main shaft 3 via the vertical plate 30. The output shaft of the reducer 10 is connected to the spur gear 32, which meshes with the cylindrical gear 31. Multiple linkage transmission units are arranged in a circular array on the outer circumference of the main shaft 3. One end of each linkage transmission unit is connected to the gear shaft of the small helical gear 6 on the fixed block 5, and the other end is connected to the conveying mechanism and provides conveying power to the conveying mechanism. This configuration facilitates the step-by-step transmission of power to the support mechanism, which in turn supports and transports the composite material pipe mold. Other components and connections are the same as in Specific Implementation Method 1.

[0030] Specific implementation method three: Combining Figure 1 and Figure 2This embodiment describes a linkage transmission unit comprising an upper linkage 26, a lower linkage 29, a sprocket 7, a chain 8, a tensioning seat 27, and a retaining ring 28. One end of the lower linkage 29 is rotatably connected to both ends of the gear shaft of the small helical gear 6. The sprocket 7 is mounted on one side of the gear shaft of the small helical gear 6, and the retaining ring 28 is mounted on the end of the gear shaft of the small helical gear 6. The other end of the lower linkage 29 is rotatably connected to one end of the upper linkage 26. A sprocket 7 is mounted on each side of the shaft at one end of the upper linkage 26, and the retaining ring 28 is mounted on the end of the shaft. The sprocket 7 on the right side of the lower linkage 29 is connected to the sprocket 7 on the right side of one end of the upper linkage 26 via a chain 8. The sprocket 7 on the left side of one end of the upper linkage 26 is connected to the sprocket 7 on the left side of the other end of the upper linkage 26 via a chain 8. The shaft on the sprocket 7 at the other end of the upper linkage 26 is coaxial with the drive shaft of the conveying mechanism. This configuration facilitates the provision of transmission power to the support mechanism. Other components and connections are the same as in specific implementation method one or two.

[0031] Specific implementation method four: Combination Figure 1 This embodiment describes a configuration where the number of linkage transmission units is 6, 8, or 10. This arrangement facilitates support for the composite material pipe mold. Other components and connections are the same as in specific embodiments one, two, or three.

[0032] Specific Implementation Method Five: Combining Figure 1 This embodiment describes a lifting mechanism whose drive unit includes a drive motor 50 and a T-shaped reducer 25. The drive motor 50 is connected to the input end of the T-shaped reducer 25, and each end of the T-shaped reducer 25 is connected to a telescopic unit. This configuration allows the T-shaped reducer 25 to provide power input from one motor side and two power output ends, thus simultaneously powering two telescopic units. Other components and connections are the same as in specific embodiments one, two, three, or four.

[0033] Specific Implementation Method Six: Combination Figure 1 and Figure 2 This embodiment describes a telescopic unit that includes a coupling 24, a lead screw fixing seat 23, a linerless spacer 22, a guide rail plate 21, a small indexing plate 18, a lead screw 51, and multiple lifting components.

[0034] The output shaft of the T-type reducer 25 is connected to the lead screw 51 via a coupling 24. The lead screw fixing seat 23 is installed on the outside of the coupling 24. The guide rail plate 21 is arranged coaxially with the main shaft 3. A bushing-less spacer 22 is installed in the middle of the guide rail plate 21. The main shaft 3 passes through the bushing-less spacer 22 and the guide rail plate 21. The lead screw 51 passes through the lead screw fixing seat 23 and the guide rail plate 21. A small indexing plate 18 is installed at the tail of the lead screw 51. The small indexing plate 18 is connected to the conveying mechanism via multiple circumferentially arranged lifting components. This configuration is simple and facilitates simultaneous lifting of multiple support mechanisms. Other components and connections are the same as in specific embodiments one, two, three, four, or five.

[0035] Specific implementation method seven: Combining Figure 1 and Figure 2 This embodiment describes a lifting component that includes a slide block 13, a guide rail 20, a rotating shaft 19, a lifting seat 17, and a lifting connecting rod 12. The guide rail 20 is mounted on the guide rail disk 21 along its radial direction. The slide block 13 is slidably mounted on the guide rail 20. One end of the lifting connecting rod 12 is rotatably connected to the small indexing plate 18 via the rotating shaft 19. The middle part of the lifting connecting rod 12 is connected to the slide block 13. The other end of the lifting connecting rod 12 is connected to the conveying mechanism via the lifting seat 17. This configuration results in a simple structure, flexible lifting action, and no jamming. Other components and connections are the same as in specific embodiments one, two, three, four, five, or six.

[0036] Specific implementation method eight: Combination Figure 1 This embodiment describes a support mechanism comprising a bearing seat 16, a liner 15, a timing belt 14, a sliding rod 52, and two pulleys. The pulleys are mounted at both ends of the sliding rod 52, and each pulley has a bearing seat 16 mounted at both ends. The two pulleys are connected by the timing belt 14. The liner 15 is mounted on the side end face of the sliding rod 52. This configuration not only supports the composite material pipe mold but also facilitates its transport. Other components and connections are the same as in specific embodiments one, two, three, four, five, six, or seven.

[0037] Combination Figures 1 to 4 Explanation of the working principle of this invention:

[0038] In operation, the variable diameter continuous winding conveying mechanism of the present invention has a composite material pipe mold mounted on the variable diameter conveying mechanism device, and a large indexing plate fixedly connected to a support. The variable diameter continuous winding conveying mechanism consists of a large indexing plate 1 bolted to the frame, a main shaft 3 passing through the large indexing plate 1 and connected to a connecting plate 2, and bolted to the large indexing plate 1. A servo motor 11 and a reducer 10 are fixed to the main shaft 3 by a vertical plate 30. After speed reduction by the reducer 10, the servo motor 11 extends out and connects to a spur gear 32. The spur gear 32 meshes with a cylindrical gear 31 for transmission. The cylindrical gear 31 is bolted to a large helical gear 4 and keyed to the main shaft 3. The servo motor 11 drives the spur gear 32 to rotate, transmitting power through meshing. The cylindrical gear 31 and the large helical gear 4 rotate, driving the small helical gear 6 to rotate. The small helical gear 6 drives the lower connecting rod 29 and the upper connecting rod 26 to move. The lower connecting rod 29, the rotating shaft 19, and the upper connecting rod 26 form a lifting connecting rod component to complete the vertical and main shaft direction movement of the variable diameter continuous winding conveyor mechanism. The end of the rotating shaft 19 is connected to the sprocket 7, which is fixed by the retaining ring 28. Rolling bearings restrict the position of the sprocket 7 and the chain 8 during movement. The sprocket transmits power to drive the synchronous belt pulley 9 to rotate, which in turn drives the synchronous belt 14 along the shaft. The composite material pipe moves along its axis by moving in the directional direction. The lifting mechanism of the variable diameter continuous winding conveyor consists of a large indexing plate and a small indexing plate fixedly supported on the main shaft. The slide rail is bolted into the slide rail groove of the large indexing plate. The slide rail block cooperates with the slide rail and slides along the radial direction of the variable diameter continuous winding conveyor. One end of the lifting linkage is connected to the slide rail block via a rotating shaft, forming a rotating pair that rotates around the shaft. The other end is connected to a fixed seat via the rotating shaft. The other end of the fixed seat is bolted to the small indexing plate for fixation. The position of the lower lifting link is restricted. One end of the other lifting link is connected to the slide rail seat via a rotating shaft, and the other end is connected to the lifting seat via a rotating shaft. The lifting seat is connected to the synchronous belt bracket, realizing the radial movement of the synchronous belt, which in turn drives the composite material pipe mold mounted on the synchronous belt to move in the radial direction. When the servo motor 11 drives the large helical gear to rotate, the small helical gear drives the sprocket through mutual meshing, which in turn drives the synchronous belt pulley to rotate, realizing the dual-axis linkage feeding and winding process of the composite material pipe mold in the axial and radial directions.

[0039] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Those skilled in the art can make other changes within the spirit of the invention and apply it to fields not mentioned in the invention. Of course, all such changes made in accordance with the spirit of the invention should be included within the scope of protection claimed by the invention.

Claims

1. A conveying mechanism applicable to continuous winding with variable diameter, characterized in that: It includes a lifting mechanism, a fixing mechanism, a conveying mechanism, and multiple support mechanisms. The fixing mechanism includes a large indexing plate (1) and a connecting plate (2), with the connecting plate (2) installed in the middle of the outer end face of the large indexing plate (1); The lifting mechanism includes a drive unit and two sets of telescopic units. The two ends of the drive unit are respectively connected to a set of telescopic units. Multiple support mechanisms are installed on the telescopic units in the circumferential direction, and the support mechanisms support the composite material pipe mold under the action of the telescopic units. The front end of the conveying mechanism is inserted into the large indexing plate (1) of the fixed mechanism, and the conveying mechanism provides conveying power to the supporting mechanism; The conveying mechanism includes a servo motor (11), a reducer (10), a vertical plate (30), a main shaft (3), a large helical gear (4), a fixed block (5), a small helical gear (6), a cylindrical gear (31), a spur gear (32), and multiple linkage transmission units. The cylindrical gear (31) and the large helical gear (4) are coaxially mounted on the main shaft (3). The upper part of the fixing block (5) is inserted into the groove at the bottom of the large indexing plate (1). The small helical gear (6) is rotatably mounted on the lower part of the fixing block (5), and the small helical gear (6) meshes with the large helical gear (4). The output shaft of the servo motor (11) is connected to the reducer (10). The reducer (10) is bolted to the vertical plate (30). The vertical plate is mounted on the main shaft (3) and bolted to it. The reducer (10) is installed parallel to the main shaft (3) via the vertical plate (30). The output shaft of the reducer (10) is connected to the spur gear (32). The spur gear (32) meshes with the cylindrical gear (31). Multiple linkage transmission units are arranged in a ring array on the outer circumference of the main shaft (3), and one end of the linkage transmission unit is connected to the gear shaft of the small helical gear (6) on the fixed block (5), and the other end of the linkage transmission unit is connected to the conveying mechanism and provides conveying power to the conveying mechanism. The driving unit of the lifting mechanism includes a drive motor (50) and a T-type reducer (25). The drive motor (50) is connected to the input end of the T-type reducer (25), and the two ends of the T-type reducer (25) are respectively connected to a telescopic unit.

2. The conveying mechanism applicable to variable diameter continuous winding according to claim 1, characterized in that: The number of linkage drive units is 6, 8, or 10.

3. A conveying mechanism applicable to variable-diameter continuous winding according to claim 1 or 2, characterized in that: The telescopic unit includes a coupling (24), a lead screw fixing seat (23), a linerless spacer (22), a guide rail plate (21), a small indexing plate (18), a lead screw (51), and multiple lifting components. The output shaft of the T-type reducer (25) is connected to the lead screw (51) through the coupling (24). The lead screw fixing seat (23) is installed on the outside of the coupling (24). The guide rail plate (21) is arranged coaxially with the main shaft (3). The unlined spacer (22) is installed in the middle of the guide rail plate (21). The main shaft (3) passes through the unlined spacer (22) and the guide rail plate (21). The lead screw (51) passes through the lead screw fixing seat (23) and the guide rail plate (21). A small indexing plate (18) is installed at the tail of the lead screw (51). The small indexing plate (18) is connected to the conveying mechanism through multiple lifting parts arranged in a circle.

4. A conveying mechanism applicable to variable-diameter continuous winding according to claim 3, characterized in that: Each lifting component includes a slide block (13), a guide rail (20), a rotating shaft (19), a lifting seat (17), and a lifting linkage (12). The guide rail (20) is installed on the guide rail disk (21) in the radial direction of the guide rail disk (21). The slide block (13) is slidably installed on the guide rail (20). One end of the lifting link (12) is rotatably connected to the small indexing disk (18) through the rotating shaft (19). The middle part of the lifting link (12) is connected to the slide block (13). The other end of the lifting link (12) is connected to the conveying mechanism through the lifting seat (17).

5. A conveying mechanism applicable to variable-diameter continuous winding according to claim 4, characterized in that: The support mechanism includes a bearing housing (16), a liner (15), a timing belt (14), a sliding rod (52), and two pulleys. The pulleys are installed at both ends of the sliding rod (52), and each pulley has a bearing seat (16) installed at both ends. The two pulleys are connected by a synchronous belt (14), and the liner (15) is installed on the side end face of the sliding rod (52).

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