line puller

Abstract

The application relates to the field of construction auxiliary equipment, in particular to a wire pulling device. The wire pulling device comprises a shell, a wire pulling assembly and a wire feeding assembly. The wire pulling assembly comprises a rotating disc rotationally connected with the shell, a traction wire wound on the rotating disc and a wire pulling driving element for driving the rotating disc to rotate. The wire feeding assembly comprises two compression wheels mounted in the shell and a wire feeding driving element for driving the compression wheels to rotate. When feeding the wire, the traction wire is compressed by the two compression wheels, then the wire feeding driving element drives the compression wheels to rotate, the compression wheels drive the traction wire to feed outwards through friction resistance, and the rotating disc is driven to rotate continuously to release the wire in the process. The traction wire is connected with the electric wire after passing through the embedded pipeline. The rotating disc is driven to rotate by the wire pulling driving element to wind the traction wire. The operation of passing the traction wire through the embedded pipeline is relatively convenient, and sufficient acting force can be provided to drive multiple electric wires to pass through multiple bending embedded pipelines.

Description

Technical Field

[0001] This application relates to the field of construction auxiliary equipment, and in particular to a wire puller. Background Technology

[0002] During the installation of electrical wires, the wires need to be threaded through one end of a pre-buried conduit and out the other end. All wires must be threaded through the conduit simultaneously at one time; otherwise, the wires threaded first will affect the wires threaded later. Since the pre-buried conduit may cross multiple walls and floors and has multiple bends, the resistance at the bends of the conduit will be very high when multiple wires need to be threaded through at the same time.

[0003] A pressure roller type cable puller works by clamping the traction cable with pressure rollers. A motor drives two pressure rollers to rotate, first guiding the traction cable through a pre-buried conduit, then connecting the electric wire to the traction cable. The pressure rollers then rotate in the opposite direction, pulling the traction cable and electric wire together to pass through the conduit. However, due to the maximum static friction resistance between the pressure rollers and the traction cable, when there are many electric wires or the conduit has many bends, the resistance will exceed the maximum static friction resistance under the puller's maximum clamping force, causing the puller to fail.

[0004] To accommodate scenarios with a large number of wires and numerous bends in the embedded conduit, in addition to pressure roller type cable pullers, there are also rotary type cable pullers that use a turntable to wind the traction line, solving the problem of insufficient pulling force when pulling multiple wires through numerous bends in the embedded conduit. However, unlike pressure roller type cable pullers which use a pressure roller to press the traction line and provide the force for feeding the wire, this type of puller requires manual assistance to guide the traction line on the turntable through the embedded conduit during the wire feeding process. Utility Model Content

[0005] In order to provide greater pulling force while facilitating the passage of the traction line through the pre-buried pipe, this application provides a traction cable puller.

[0006] This application provides a wire puller, which adopts the following technical solution: A wire puller includes a housing, a wire pull assembly, and a wire feeding assembly. The cable assembly includes a turntable rotatably connected to the housing, a traction cable wound on the turntable, and a cable drive component for driving the turntable to rotate. The cable drive component is provided with a connection end for connecting to an external power input unit. The wire feeding assembly includes two clamping rollers installed inside the housing, and a wire feeding drive component that drives the clamping rollers to rotate. The wire feeding drive component is a fixed clamping shaft installed on one of the clamping rollers, and at least one end of the fixed clamping shaft passes through / out of the housing as a connection end for connecting to an external power input unit.

[0007] By adopting the above technical solution, during wire feeding, two clamping rollers press the traction wire firmly. Then, the wire feeding drive unit drives the clamping rollers to rotate, and the clamping rollers, through frictional resistance, drive the traction wire outward. During this process, the turntable is driven to rotate and continuously release the wire. After the traction wire passes through the pre-buried pipe, it is connected to the power cable. Then, the pull-wire drive unit drives the turntable to rotate and rewind the traction wire, which in turn drives the power cable through the pre-buried pipe. Because the traction wire is pressed and fed by clamping rollers, it is relatively convenient to use an electric drill or other tools to provide power to transport the traction wire through the pre-buried pipe. At the same time, because the pull-wire assembly uses a turntable to rewind the wire, it can provide sufficient force to drive multiple power cables through multiple bends in the pre-buried pipe.

[0008] Preferably, the clamping wheel includes a fixed clamping wheel installed in the housing and a movable clamping wheel that cooperates with the fixed clamping wheel to clamp the traction line.

[0009] By adopting the above technical solution, the traction line is pressed by the cooperation of the fixed clamping wheel and the movable clamping wheel. When the external power input unit is connected to the fixed clamping shaft, it drives the fixed clamping wheel to rotate, so that the traction line is driven to be transported.

[0010] Preferably, a nut is fixedly installed on the inner wall of the housing, and the screw portion of the hand-tightening bolt that is threaded with the nut passes through the nut from the outside of the housing and is inserted into the housing. The inner walls of the upper and lower housings are both formed with a second track groove extending from the nut position toward the direction of the fixed clamping wheel. The U-shaped slider is located in the second track groove and can only move along the direction of the second track groove. The movable clamping wheel is mounted on the slider.

[0011] By adopting the above technical solution, the movable clamping wheel can move along the direction of the second track groove through the cooperation of the slider and the second track groove, and the movable clamping wheel can be engaged to clamp the traction line by rotating the handle bolt to provide sufficient friction to drive the traction line.

[0012] Preferably, the slider includes a force-bearing plate and side plates located on both sides of the force-bearing plate extending perpendicularly to the force-bearing plate towards the fixed clamping wheel. The two side plates have positioning grooves formed on the side facing the fixed clamping wheel. A movable clamping shaft is installed inside the movable clamping wheel, and the upper and lower ends of the movable clamping shaft are engaged in the positioning grooves.

[0013] Preferably, it also includes a central rotating shaft disposed inside the housing for mounting the turntable. The housing and the two ends of the central rotating shaft are connected by fasteners. Both the upper and lower ends of the central rotating shaft are fitted with central bearings, and the turntable is fitted on the outside of the central bearings.

[0014] By adopting the above technical solution, the turntable is installed through the central rotating shaft.

[0015] Preferably, the turntable includes a central tube and limiting discs formed on the upper and lower sides of the central tube, and at least one limiting disc has a ring of meshing teeth formed around its outer periphery. The cable pulling drive includes a drive shaft, and the drive shaft is provided with a first gear that engages with the meshing teeth.

[0016] By adopting the above technical solution, the upper and lower limits of the traction line are controlled by the limiting plate to prevent the traction line from detaching from the turntable. When the drive shaft rotates, it drives the turntable to rotate and rewind the traction line. At this time, the traction line, along with the power cable, is pulled back and passes through the pre-buried pipe.

[0017] Preferably, a lower limiting plate, a spring, an upper abutment plate, and a first gear are sequentially mounted on the drive shaft. The spring is located between the lower limiting plate and the upper abutment plate. An embedding groove is formed on the upper end face of the upper abutment plate, and a ball is embedded in the embedding groove. The upper part of the ball extends beyond the upper end face of the upper abutment plate. A locking post is formed below the first gear, and a wave-shaped locking groove is formed around the lower end face of the locking post along the circumference.

[0018] By adopting the above technical solution, under the action of the spring, the upper abutment plate abuts against the locking post below the first gear, at which point the ball is locked into the locking groove. Through the cooperation of the locking groove and the ball, the first gear can only rotate when a large force is applied to overcome the elastic force of the spring, causing the upper abutment plate to move downward and the ball to disengage from the locking groove.

[0019] Preferably, the upper abutment plate has an upper limit block formed on its side, and the inner wall of the housing has a first track groove formed to cooperate with the upper limit block. The first track groove restricts the upper abutment plate to move only along the direction of the first track groove.

[0020] By adopting the above technical solution, the upper and lower limit blocks work together to ensure that the upper abutment plate can only move along the direction of the first track groove. Therefore, the first gear can only rotate when a large force is applied to overcome the spring force, causing the upper abutment plate to move downward and the ball to disengage from the locking groove. This effectively avoids the situation where the turntable rotates without applying external force, causing the traction cable to be released, and makes it easier to store.

[0021] Preferably, both the upper and lower ends of the force-applying shaft are rotatably connected to the housing via force-applying bearings. A second gear that meshes with the first gear is installed on the force-applying shaft. After passing through the housing, both the upper and lower ends of the force-applying shaft are flush with the surface of the housing. At least one end of the force-applying shaft passes through / out of the housing as a connection end for connecting to an external power input unit.

[0022] By adopting the above technical solution, the transmission ratio of the applied force is further increased through the setting of the force-applying shaft and the second gear, making it easier to drive rotation when applying force. Furthermore, when the two sets of gears change direction, the rotation direction is consistent when the external power source connects to the wire feeding assembly to drive the wire release and when it connects to the wire pulling assembly to drive the wire pull. Therefore, it is not necessary to adjust the rotation direction of the external power source during use, making it more convenient to use.

[0023] Preferably, at least one end of the drive shaft passes through / out of the housing as a connection end for connecting to an external power input unit.

[0024] By adopting the above technical solution, when no force-applying shaft is provided, an external power element can be connected by setting a connecting end on the drive shaft.

[0025] In summary, this application includes at least one of the following beneficial technical effects: 1. During wire feeding, two clamping rollers tighten the traction wire. The wire feeding drive then rotates the clamping rollers, which, through frictional resistance, feed the traction wire outwards. During this process, the turntable rotates, continuously releasing the wire. After the traction wire passes through the pre-buried conduit, it is connected to the power cable. Then, the pull-wire drive rotates the turntable to rewind the traction wire, which in turn pulls the power cable through the pre-buried conduit. Because the traction wire is fed by clamping rollers, it provides power for easily conveying the traction wire through the pre-buried conduit. Simultaneously, the pull-wire assembly, with its turntable winding and rewinding mechanism, provides sufficient force to pull multiple power cables through multiple bends in the pre-buried conduit.

[0026] 2. The upper and lower limit blocks work together to ensure that the upper abutment plate can only move along the direction of the first track groove. Under the force of the spring, the upper abutment plate abuts against the locking pin below the first gear, at which point the ball joint engages in the locking groove. Through the engagement of the locking groove and the ball joint, the first gear can only rotate when a significant force is applied to overcome the spring force, causing the upper abutment plate to move downwards and the ball joint to disengage from the locking groove. This effectively prevents the turntable from rotating and causing the traction cable to unwind without external force being applied, making it easier to store.

[0027] 3. The position of the traction line is controlled by the outlet pipe. Therefore, when using it, you only need to insert the outlet pipe into the pre-buried pipe and then send the line to easily pass the traction line through the pre-buried pipe. Attached Figure Description

[0028] Figure 1 This is a structural schematic diagram of an embodiment; Figure 2 This is a schematic diagram of the internal structure of the casing in the embodiment; Figure 3 This is an exploded view of the cable-driven component; Figure 4This is a structural diagram of the top cover; Figure 5 This is a schematic diagram of the structure of the upper abutment plate and the first gear; Figure 6 yes Figure 2 Enlarged view of point A in the middle; Figure 7 This is a structural schematic diagram of Embodiment 2; Figure 8 yes Figure 7 Enlarged view of point B in the middle; Figure 9 This is a schematic diagram of the drive shaft part in Embodiment 2.

[0029] Explanation of reference numerals in the attached drawings: 1. Housing; 2. Cable pull assembly; 3. Cable feeding assembly; 4. Upper housing; 5. Lower housing; 6. Cable outlet tube; 7. Viewing window; 8. Central rotating shaft; 9. Turntable; 10. Traction cable; 11. Cable pull drive component; 12. Connector; 13. Central bearing; 14. Central tube; 15. Limiting plate; 16. Meshing teeth; 17. Drive rotating shaft; 18. Connecting column; 19. Drive bearing; 20. Mounting groove; 21. Lower limiting plate; 22. Spring; 23. Upper abutment plate; 24. 1. First gear; 25. Upper limit block; 26. First track groove; 27. Embedded groove; 28. Ball bearing; 29. ​​Snap-fit ​​post; 30. Snap-fit ​​groove; 31. Fixed clamping wheel; 32. Movable clamping wheel; 33. Guide roller; 34. Fixed clamping shaft; 35. Clamping bearing; 36. Nut; 38. Second track groove; 39. Slider; 40. Force plate; 41. Side plate; 42. Positioning groove; 43. Movable clamping shaft; 44. Force application shaft; 45. Force application shaft; 46. Second gear. Detailed Implementation

[0030] The following is in conjunction with the appendix Figure 1-9 This application will be described in further detail.

[0031] This application discloses a puller. The terms "up", "down", "left" and "right" used in the embodiments are schematic representations of relative directions and are not limitations on the positional relationship.

[0032] like Figure 1 and Figure 2 As shown, the cable puller includes a housing 1, a cable pull assembly 2 and a cable feeding assembly 3 located inside the housing 1. The housing 1 includes an upper shell 4 and a lower shell 5 that are assembled together. A cable outlet tube 6 that communicates with the interior of the housing 1 is installed on the housing 1. A viewing window 7 is formed on the side of the cable outlet tube 6.

[0033] like Figure 1 and Figure 2As shown, the cable assembly 2 includes a central shaft 8 rotatably connected between the upper shell 4 and the lower shell 5, a turntable 9 sleeved on the central shaft 8, a traction cable 10 wound on the turntable 9, and a cable drive component 11 for driving the turntable 9 to rotate. A connector 12 with a hole is fixed to the extended end of the traction cable 10. Fasteners pass through the upper shell 4 or the lower shell 5 and connect to both ends of the central shaft 8 to fix its position. Central bearings 13 are sleeved at both the upper and lower ends of the central shaft 8. The turntable 9 is sleeved on the outside of the central bearings 13, and the rotational connection between the turntable 9 and the central shaft 8 is achieved through the central bearings 13. The turntable 9 includes a central tube 14 and limiting discs 15 formed on the upper and lower sides of the central tube 14. The inner ring of the central bearing 13 is interference-fitted with the central shaft 8, and the outer ring of the bearing is interference-fitted with the inner wall of the central tube 14. A ring of meshing teeth 16 is formed around the outer periphery of the upper limiting disc 15.

[0034] like Figures 3 to 5 As shown, the cable drive component 11 includes a drive shaft 17. Connecting posts 18 are formed at both the upper and lower ends of the drive bearing 19. The diameter of the connecting posts 18 is smaller than the diameter of the drive bearing 19, and drive bearings 19 are mounted on the connecting posts 18 at both ends. Mounting grooves 20 are formed on the upper shell 4 and lower shell 5 corresponding to the positions of the drive bearings 19. The inner ring of the drive bearing 19 is interference-fitted with the connecting post 18, and the outer ring of the drive bearing 19 is interference-fitted with the inner wall of the mounting groove 20. A lower limiting plate 21, a spring 22, an upper abutment plate 23, and a first gear 24 are sequentially mounted on the drive shaft 17. The upper and lower ends of the drive shaft 17 pass through the shell 1 and are flush with the surface of the shell 1. Both end faces of the drive shaft 17 passing through the shell 1 have internal hexagonal grooves. The spring 22 is located between the lower limiting plate 21 and the upper abutment plate 23, and is used to provide an upward force to the upper abutment plate 23. An upper limit block 25 is formed on the side of the upper abutment plate 23. A first track groove 26 that mates with the upper limit block 25 is formed on the inner wall of the housing 1. The first track groove 26 is vertical and restricts the upper abutment plate 23 to move only in the up-down direction. An embedding groove 27 is formed on the upper end face of the upper abutment plate 23 near the upper limit block 25. A ball bearing 28 is embedded in the embedding groove 27, and the upper part of the ball bearing 28 extends beyond the upper end face of the upper abutment plate 23. A locking post 29 is formed below the first gear 24. A wavy locking groove 30 is formed around the lower end face of the locking post 29. Through the engagement of the locking groove 30 and the ball bearing 28, the first gear 24 can only rotate when a large force is applied to overcome the elastic force of the spring 22, causing the upper abutment plate 23 to move downward and the ball bearing 28 to disengage from the locking groove 30.

[0035] like Figure 4 and Figure 6As shown, the wire feeding assembly 3 includes a fixed clamping wheel 31 installed inside the housing 1, a movable clamping wheel 32 that cooperates with the fixed clamping wheel 31 to clamp the traction wire 10, and a guide roller 33 for guiding the traction wire 10 is provided on the side of the fixed clamping wheel 31. A fixed clamping shaft 34 is connected in the middle of the fixed clamping wheel 31. The upper and lower ends of the fixed clamping shaft 34 are rotatably connected to the housing 1 through clamping bearings 35 embedded in the housing 1. The upper and lower ends of the fixed clamping shaft 34 protrude from the housing 1, and hexagonal recesses are formed on the end faces of the fixed clamping shaft 34 protruding from the housing 1. Nuts 36 are fixedly installed on the inner sidewall of the housing 1. The screw portion of the hand-tightening bolt (not shown in the figure) that is threaded into the nut 36 passes through the nut 36 from the outside of the housing 1 and is inserted into the housing 1. The inner sidewalls of the upper housing 4 and the lower housing 5 are both formed with second track grooves 38 extending from the position of the nut 36 toward the fixed clamping wheel 31. The U-shaped slider 39 is located within the second track groove 38 and can only move along the direction of the second track groove 38. The slider 39 includes a force-bearing plate 40 and side plates 41 located on both sides of the force-bearing plate 40, extending perpendicularly to the force-bearing plate 40 towards the fixed clamping wheel 31. Positioning grooves 42 are formed on the side of the two side plates 41 facing the fixed clamping wheel 31. A movable clamping shaft 43 is installed inside the movable clamping wheel 32, and its upper and lower ends are engaged in the positioning grooves 42. By turning the hand screw, the force-bearing plate 40 can be pushed, causing the movable clamping wheel 32 to be pushed towards the fixed clamping wheel 31, thus clamping the traction line 10 located between them.

[0036] Specific usage process: When it is necessary to pass the traction cable 10 through the pre-buried pipe, insert the connection end of the drilling rig or other power input unit into the internal hexagonal groove of the fixed clamping shaft 34. Tighten the hand-tightening bolt to clamp the traction cable 10 into the fixed clamping wheel 31 and the movable clamping wheel 32. Start the power input unit; the fixed clamping wheel 31 will then rotate. Because the traction cable 10 is clamped by the fixed clamping wheel 31 and the movable clamping wheel 32, the fixed clamping wheel 31 uses friction to drive the traction cable 10 outward into the pre-buried pipe and outward. During the outward output of the traction cable 10, the turntable 9 will rotate, allowing the traction cable 10 wound on the turntable 9 to be continuously conveyed outward.

[0037] After the traction cable 10 passes through the pre-buried pipe, the connector 12 at the end of the traction cable 10 is connected to the electrical wire that needs to pass through the pre-buried pipe. The connector of the power input unit is inserted into the hexagonal recess of the drive shaft 17, and the drive shaft 17 is rotated through the power input unit. When the drive shaft 17 rotates, it drives the turntable 9 to rotate and wind up the traction cable 10. At this time, the traction cable 10 and the electrical wire are pulled back together and passed through the pre-buried pipe.

[0038] Example 2: like Figures 7 to 9 As shown, the difference between this embodiment and Embodiment 1 is only that the pull-wire drive component 11 includes a drive shaft 17 and a force-applying shaft 44. The two ends of the drive shaft 17 do not protrude from the housing, and the end faces of both ends do not have internal hexagonal grooves. Specifically, the drive shaft 17 has connecting posts 18 formed at both its upper and lower ends, and drive bearings 19 are mounted on the connecting posts 18 at both ends. The diameter of the connecting posts 18 is smaller than the diameter of the drive bearings 19. The upper housing 4 and lower housing 5 have mounting grooves 20 corresponding to the positions of the drive bearings 19. The inner ring of the drive bearing 19 is interference-fitted with the connecting post 18, and the outer ring of the drive bearing 19 is interference-fitted with the inner sidewall of the mounting groove 20. A lower limit plate 21, a spring 22, an upper abutment plate 23, and a first gear 24 are sequentially mounted on the drive shaft 17. The spring 22 is located between the lower limit plate 21 and the upper abutment plate 23, and is used to provide an upward force to the upper abutment plate 23. An upper limit block 25 is formed on the side of the upper abutment plate 23. A first track groove 26 that mates with the upper limit block 25 is formed on the inner wall of the housing 1. The first track groove 26 is vertical and restricts the upper abutment plate 23 to move only in the up-down direction. An embedding groove 27 is formed on the upper end face of the upper abutment plate 23 near the upper limit block 25. A ball bearing 28 is embedded in the embedding groove 27, and the upper part of the ball bearing 28 extends beyond the upper end face of the upper abutment plate 23. A locking post 29 is formed below the first gear 24. A wavy locking groove 30 is formed around the lower end face of the locking post 29. Through the engagement of the locking groove 30 and the ball bearing 28, the first gear 24 can only rotate when a large force is applied to overcome the elastic force of the spring 22, causing the upper abutment plate 23 to move downward and the ball bearing 28 to disengage from the locking groove 30.

[0039] Both ends of the force-applying shaft 44 are rotatably connected to the housing 1 via force-applying bearings 45. A second gear 46, meshing with the first gear 24, is mounted on the force-applying shaft 44. After passing through the housing 1, both ends of the force-applying shaft 44 are flush with the surface of the housing 1, and both end faces of the force-applying shaft 44 passing through the housing 1 are formed with internal hexagonal grooves. The second gear 46 further increases the transmission ratio of the force application, making it easier to apply force to drive rotation. Moreover, with the two-way direction change via the first gear 24 and the second gear, when the external power source connects to the wire feeding assembly 3 to drive the wire release, the rotation direction is consistent with when the external power source connects to the wire pulling assembly 2 to drive the wire pull. During use, there is no need to adjust the rotation direction of the external power source, making it more convenient to use.

[0040] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A pull cord device, characterized in that, Includes a housing (1), a wire pull assembly (2), and a wire feeding assembly (3). The cable assembly (2) includes a turntable (9) rotatably connected to the housing (1), a traction cable (10) wound on the turntable (9), and a cable drive (11) for driving the turntable (9) to rotate. The cable drive (11) is provided with a connection end for connecting to an external power input unit. The wire feeding assembly (3) includes two clamping rollers installed inside the housing (1) and a wire feeding drive for driving the clamping rollers to rotate. The wire feeding drive is a fixed clamping shaft (34) installed on one of the clamping rollers. At least one end of the fixed clamping shaft (34) passes through / out of the housing (1) as a connection end for connecting to an external power input unit.

2. The drawstring device according to claim 1, characterized in that, The clamping wheel includes a fixed clamping wheel (31) installed in the housing (1) and a movable clamping wheel (32) that cooperates with the fixed clamping wheel (31) to clamp the traction line (10).

3. The wire puller according to claim 2, characterized in that, A nut (36) is fixedly installed on the inner wall of the housing (1). The screw part of the hand-tightening bolt that is threaded with the nut (36) passes through the nut (36) from the outside of the housing (1) and is inserted into the housing (1). The inner walls of the upper shell (4) and the lower shell (5) are both formed with a second track groove (38) extending from the nut (36) towards the fixed pressure wheel (31). The U-shaped slider (39) is located in the second track groove (38) and can only move along the direction of the second track groove (38). The movable pressure wheel (32) is installed on the slider (39).

4. The drawstring device according to claim 3, characterized in that, The slider (39) includes a force plate (40) and side plates (41) located on both sides of the force plate (40) extending perpendicularly to the force plate (40) towards the fixed clamping wheel (31). The two side plates (41) have positioning grooves (42) formed on the side facing the fixed clamping wheel (31). A movable clamping shaft (43) is installed inside the movable clamping wheel (32), and the upper and lower ends of the movable clamping shaft (43) are inserted into the positioning grooves (42).

5. The drawstring device according to claim 1, characterized in that, It also includes a central rotating shaft (8) set inside the housing (1) for mounting the turntable (9). The housing (1) and the two ends of the central rotating shaft (8) are connected by fasteners. Both the upper and lower ends of the central rotating shaft (8) are fitted with central bearings (13), and the turntable (9) is fitted on the outside of the central bearings (13).

6. The wire puller according to claim 5, characterized in that, The turntable (9) includes a central tube (14) and limiting discs (15) formed on the upper and lower sides of the central tube (14). At least one limiting disc (15) has a ring of meshing teeth (16) formed around its outer periphery. The cable pull drive (11) includes a drive shaft (17) and a first gear (24) that meshes with the meshing teeth (16) is provided on the drive shaft (17).

7. The wire puller according to claim 6, characterized in that, The drive shaft (17) is sequentially fitted with a lower limiting plate (21), a spring (22), an upper abutment plate (23), and a first gear (24). The spring (22) is located between the lower limiting plate (21) and the upper abutment plate (23). The upper end face of the upper abutment plate (23) is formed with an embedding groove (27). A ball (28) is embedded in the embedding groove (27), and the upper part of the ball (28) extends beyond the upper end face of the upper abutment plate (23). A locking post (29) is formed below the first gear (24). The lower end face of the locking post (29) is formed with a wave-shaped locking groove (30) around the circumference.

8. The drawstring device according to claim 7, characterized in that, The upper abutment plate (23) has an upper limit block (25) formed on its side, and the inner wall of the housing (1) has a first track groove (26) that cooperates with the upper limit block (25). The first track groove (26) restricts the upper abutment plate (23) to move only along the direction of the first track groove (26).

9. The drawstring device according to claim 8, characterized in that, The cable drive (11) also includes a force-applying shaft (44). Both the upper and lower ends of the force-applying shaft (44) are rotatably connected to the housing (1) through force-applying bearings (45). A second gear (46) that meshes with the first gear (24) is installed on the force-applying shaft (44). After passing through the housing (1), the upper and lower ends of the force-applying shaft (44) are flush with the surface of the housing (1). At least one end of the force-applying shaft (44) passes through / out of the housing (1) as a connection end for connecting to an external power input unit.

10. The drawstring device according to claim 6, characterized in that, At least one end of the drive shaft (17) passes through / out of the housing (1) as a connection end for connecting to an external power input unit.

Images