Wire harness telescoping system of sliding piece

Abstract

The utility model discloses a wire harness telescoping system of a sliding piece, which comprises a shell, a wire rotating disc, a pull rope, a spiral spring piece, a base, a pulley block and a wire harness, and is characterized in that the base is detachably arranged at one end of the shell; the wire rotating disc is installed on the base, the spiral spring piece is installed in the middle of the wire rotating disc, the periphery of the wire rotating disc is connected with the pull rope, and the spiral spring piece is connected with the wire rotating disc and the base. The pull rope is further connected with a pulley block which is installed in the shell in a sliding mode. And the wire harness is connected with the pulley block. According to the utility model, through the cooperation of the spiral spring piece and the pulley block, the wire harness can stretch out and draw back without being curled, so that the wire harness is prevented from being abraded and damaged possibly in the curling and unfolding process, and the service life of the wire harness is prolonged; the wire harness keeps uniform tension and less friction in the use process, so that the material fatigue is reduced, and the durability is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of automotive sunroof accessories, and particularly relates to a wire harness telescopic system for a sliding member. Background Art

[0002] In the overall structure of an automotive sunroof, since the sunroof moves during the opening and closing process, the wire harness connecting the sunroof needs to stretch or contract as the sunroof moves. However, if the wire harness cannot be properly managed, excessive stretching or extrusion during the use of the wire harness will cause the wire harness to break or be short-circuited and damaged. The damage of the wire harness will not only cause the sunroof to malfunction, but may also cause safety hazards such as fires. In order to effectively manage the wire harness of the sunroof in the prior art, usually automobile manufacturers will wind the wire harness around a reel. When the sunroof moves, the wire harness will automatically roll up or unwind accordingly to achieve the management of the wire harness. However, it is found in actual use that the wire harness may rub against the reel or other components during the repeated telescoping process, resulting in wear, deformation or breakage of the wire harness, especially when the diameter of the reel is small; and the reel also has the problem of insufficient strength. After long-term use, it is easy to deform or be damaged, resulting in poor rotation of the reel, and will also cause the wire harness to be stuck or twisted and damaged. If the wire harness is not firmly connected to the reel, it may become loose during use, resulting in the wire harness being entangled and disordered. Summary of the Utility Model

[0003] Aiming at the deficiency that the existing wire harness is extremely prone to wear and damage when stretching or contracting through a reel, which will affect the normal use of the wire harness, the utility model provides a wire harness telescopic system for a sliding member that realizes the telescoping of the wire harness through sliding. During the telescoping process of the wire harness, the wire harness does not need to be curled and contracted, and the service life of the wire harness can be extended.

[0004] To achieve the above object, the technical solution of the utility model is as follows:

[0005] A wire harness telescopic system for a sliding member includes a housing, a wire winding disc, a pull rope, a spiral spring piece, a base, a pulley group and a wire harness. The base is detachably installed at one end of the housing; the wire winding disc is rotatably installed on the base, and a spiral spring piece is installed in the middle of the wire winding disc. One end of the pull rope is fixedly connected to the outer periphery. One end of the spiral spring piece is fixedly connected to the inner wall of the wire winding disc, and the other end is fixedly connected to the base; the other end of the pull rope is fixedly connected to the pulley group, and the pulley group is slidably installed in the housing; the wire harness is connected to the pulley group.

[0006] Furthermore, a pair of sliding grooves are provided on the housing, and the sliding grooves are symmetrically arranged; both ends of the pulley set are movably clamped into the sliding grooves respectively. The pulley set moves in the sliding grooves through a traction wire harness to achieve the storage of the wire harness. At the same time, the limited movement of the pulley set can be realized, and the pulley set can be prevented from detaching from the housing during use; the pulley set realizes the storage of the wire harness through the movement in the sliding grooves by the traction wire harness, which can avoid the problem of the wire harness being entangled and knotted, keep the wire harness neat and orderly, and facilitate the management and maintenance of the wire harness.

[0007] Furthermore, the pulley set includes a rotating column and a pulley seat. The pulley seat is a U-shaped seat, and both ends of the rotating column are rotatably clamped into the U-shaped seat respectively; the top and bottom of the rotating column are sliding bumps that fit the sliding grooves respectively, and a wire harness groove for fitting the wire harness is also provided in the middle of the rotating column. When the skylight is opened, the wire harness is pulled out as the skylight moves, driving the pulley set to move along the sliding groove away from the base. During this process, the pulley set slides smoothly in the sliding groove through the sliding bumps on the rotating column, and at the same time, the wire harness moves along the wire harness groove of the rotating column to realize the extension of the wire harness; when the skylight is closed, the elastic force of the spiral spring piece makes the pulley set move along the sliding groove towards the base direction, so as to retract the wire harness into the housing; the wire harness groove on the side of the rotating column effectively guides the movement of the wire harness, prevents the wire harness from being knotted or entangled during use, keeps the wire harness neat and orderly, and at the same time reduces the possibility of the wire harness being damaged, which is convenient for daily management and maintenance.

[0008] Further, a second convex post is provided in the middle of the base, and threaded connection posts are provided around it. A through hole is provided in the middle of the second convex post, and an inverted hook groove is further provided on the outer periphery. Corresponding screws are also threadedly connected to the threaded connection posts, and the screws pass through the housing and then connect to the threaded connection posts. A second inverted hook is provided on the inner wall of the wire reel, and a connection post matching the through hole is further provided in the middle. One end of the spiral spring piece is provided with a first inverted hook structure, and the other end is provided with a square hole. The first inverted hook structure is embedded in the inverted groove of the base for fixation, and the square hole is correspondingly connected to the second inverted hook on the inner wall of the wire reel. One end of the pull rope is connected to the connection post of the wire reel. The connection post in the middle of the wire reel is connected to one end of the pull rope. When installing the wire reel, first embed the end of the spiral spring piece with the first inverted hook structure into the inverted hook groove of the base for fixation, and connect the other end with the square hole to the second inverted hook on the inner wall of the wire reel. Then, fix the base to the corresponding hole positions on the housing through the threaded connection posts around it with screws. The connection is stable and reliable, avoiding accidental detachment of the spring piece during use. When the wire reel rotates, it will drive the spiral spring to tighten or loosen, realizing the accumulation and release of elastic force. At this time, through the cooperation between the rotating disc and the pull rope, the pull rope pulls the pulley block to tighten the wire harness at different positions. The base is tightly connected to the housing through the threaded connection posts and screws, ensuring the stable structure of the entire device. The extension and recovery of the wire harness are automatically controlled by the elastic force of the spiral spring piece, ensuring that the wire harness is always in an appropriate tension state, neither too loose to cause entanglement nor too tight to cause damage. This design enables the wire harness to smoothly extend and recover during the opening and closing of the sunroof, reducing the risk of wire harness wear and simplifying the management of the wire harness.

[0009] Further, a spiral wire groove is provided on the circumferential wall outside the wire transfer disc, a straight wire groove is provided on the top surface, and a round hole is provided at the center of the top surface of the wire transfer disc. The round hole is arranged in the middle of the rotating column; one end of the straight wire groove communicates with the top of the spiral wire groove, and the other end communicates with the round hole; a first convex column is provided at one end of the pull rope, and the first convex column is correspondingly embedded into the first round hole for fixed connection. Then, the pull rope is installed along the straight wire groove and the spiral wire groove in sequence. After the pull rope is separated from the wire transfer disc, the other end is connected to the pulley group. During installation, the wire transfer disc is installed on the base to ensure that the round hole in the middle of the wire transfer disc matches the second convex column in the middle of the base. Then, find the straight wire groove and the spiral wire groove on the top surface of the wire transfer disc, embed the first convex column at the end of the pull rope into the round hole on the top surface of the wire transfer disc for fixation, and then lay the pull rope along the straight wire groove and then along the spiral wire groove to ensure the correct arrangement of the pull rope on the wire transfer disc. Finally, connect the other end of the pull rope to the pulley group; during use, as the wire transfer disc rotates, the pull rope winds or unwinds along the spiral wire groove, driving the wire harness to be received into the housing or extend outwards; through the design of the spiral wire groove, it is ensured that the pull rope is evenly distributed on the wire transfer disc. Even during the telescopic process of the wire harness, the pull rope can maintain an orderly arrangement, avoiding the mess of the pull rope on the wire transfer disc and reducing the risk of the pull rope knotting. The combined design of the straight wire groove and the spiral wire groove ensures that the pull rope can be quickly and accurately positioned and fixed on the wire transfer disc, simplifying the assembly process.

[0010] Usage method of the present utility model:

[0011] When the wire harness telescopic mechanism is installed on the automobile sunroof, one end of the wire harness is fixedly installed on the frame of the automobile sunroof, and the other end is connected to the sunroof or the moving block that needs to move; when the wire transfer disc rotates under the action of the pull rope telescopic, the spiral spring piece will generate a spiral reaction force to balance the system. Under the elastic force of the spiral spring piece, the wire harness and the pull rope are in a stable equilibrium state at any position. When the sunroof is closed, the spiral spring piece is in a normal relaxed state. At this time, the spiral spring piece has no elastic force, and the pulley group drives the wire harness to be close to the base; when the sunroof needs to be opened, the sunroof drives the wire harness to move away from the base. During this process, the wire harness drives the pulley group to gradually move away from the base, and at the same time drives the wire transfer disc to rotate, causing the spiral spring piece inside the wire transfer disc to tighten and accumulate spring elastic force; when the sunroof needs to be closed, the sunroof drives the wire harness to move along the housing direction. During this process, the spiral spring piece resets, pulling the pulley group and the wire harness to move towards the base direction, and recycling the wire harness into the housing to keep the wire harness in a taut state at all times.

[0012] For the prior art, the present utility model has the following advantages and beneficial effects:

[0013] 1. The utility model realizes the telescoping of the wire harness without curling by using the cooperation of a spiral spring plate and a pulley group. This design avoids the wear and damage that may occur during the curling and unfolding of the wire harness, thus significantly extending the service life of the wire harness. Since the wire harness maintains a relatively uniform tension and less friction during use, this helps reduce material fatigue and improve durability. The spiral spring plate in the wire harness telescoping mechanism generates a reaction force under the telescoping action of the pulling rope, which helps maintain the balance of the system, ensures that the wire harness can maintain a stable state during telescoping, and reduces the risk of failure caused by uneven wire harness tension or excessive stretching.

[0014] 2. The spiral spring plate of the utility model generates a reaction force under the telescoping action of the pulling rope to maintain the balance of the system, making the wire harness and the pulling rope stable at any position, and improving the stability of the mechanism. The pulley group realizes the storage of the wire harness by moving in the chute, avoiding the pulley group from detaching from the housing, ensuring the safety and reliability of the mechanism. The design of the rotating column and the pulley seat allows the pulley group to slide smoothly in the chute, effectively guiding the movement of the wire harness and preventing the wire harness from knotting or tangling.

[0015] 3. The connection between the base and the wire transfer disc is stable and reliable, preventing the spring plate from accidentally falling off and ensuring the long-term stable operation of the mechanism. The design of the spiral wire groove and the straight wire groove ensures the correct arrangement of the pulling rope on the wire transfer disc, reducing the risk of the pulling rope knotting. The first convex column at the end of the pulling rope is embedded in the round hole on the top surface of the wire transfer disc for fixation, ensuring the correct arrangement and fixation of the pulling rope and simplifying the installation process. The elastic force of the spiral spring plate automatically controls the extension and retraction of the wire harness, maintaining an appropriate tension state of the wire harness and avoiding the slack and damage of the wire harness. The round hole of the wire transfer disc cooperates with the second convex column of the base, ensuring the precise fit between the wire transfer disc and the base, and improving the assembly accuracy and operation efficiency of the entire mechanism. Description of the Drawings

[0016] Figure 1 is an exploded view of a wire harness telescoping system with a sliding part.

[0017] Figure 2 is a three-dimensional structural schematic diagram of a wire harness telescoping system with a sliding part.

[0018] Figure 3 is Figure 2 a cross-sectional view of the connection relationship between the housing and the pulley group at A-A in

[0019] Figure 4 is an exploded view of the base of a wire harness telescoping system with a sliding part and other cooperating components.

[0020] Figure 5 is Figure 4 a cross-sectional view of the connection relationship of each component at B-B in

[0021] Attached drawing reference signs:

[0022] Housing - 1, chute - 11, wire reel - 2, round hole - 21, linear wire groove - 22, connecting column - 23, second barb - 24, pull rope - 3, first convex column - 31, helical spring piece - 4, first barb - 41, square hole - 42, base - 5, second convex column - 51, barb groove - 52, threaded connecting column - 53, pulley set - 6, sliding convex block - 61, pulley seat - 62, wire harness groove - 63, wire harness - 7, screw - 8. Detailed implementation manners

[0023] The present utility model will be further described below in conjunction with the attached drawings.

[0024] Embodiment 1: A wire harness telescopic system for a sliding member, comprising a housing 1, a wire reel 2, a pull rope 3, a helical spring piece 4, a base 5, a pulley set 6 and a wire harness 7, wherein the base 5 is detachably installed at one end of the housing 1; the wire reel 2 is rotatably installed on the base 5, and a helical spring piece 4 is installed in the middle of the wire reel 2, and one end of the pull rope 3 is fixedly connected to the outer periphery, wherein one end of the helical spring piece 4 is fixedly connected to the inner wall of the wire reel 2, and the other end is fixedly connected to the base 5; the other end of the pull rope 3 is fixedly connected to the pulley set 6, and the pulley set 6 is slidably installed in the housing 1; the wire harness 7 is connected to the pulley set 6.

[0025] When the wire harness telescopic mechanism is installed on an automobile sunroof, one end of the wire harness 7 is fixedly installed on the frame of the automobile sunroof, and the other end is connected to the sunroof or the moving block that needs to move; when the wire reel 2 rotates under the telescopic action of the pull rope 3, the helical spring piece 4 will generate a helical reaction force to balance the system. Under the elastic force of the helical spring piece 4, the wire harness 7 and the pull rope 3 are in a stable equilibrium state at any position. When the sunroof is closed, the helical spring piece 4 is in a normal relaxed state, at this time the helical spring piece 4 has no elastic force, and the pulley set 6 drives the wire harness 7 to be in a position close to the base 5; when the sunroof needs to be opened, the sunroof drives the wire harness 7 to move away from the base 5. During this process, the wire harness 7 drives the pulley set 6 to gradually move away from the base 5, and at the same time drives the wire reel 2 to rotate, so that the helical spring piece 4 inside the wire reel 2 is tightened, accumulating spring elastic force; when the sunroof needs to be closed, the sunroof drives the wire harness 7 to move along the housing 1. During this process, the helical spring piece 4 resets, pulling the pulley set 6 and the wire harness 7 towards the base 5, and recovering the wire harness 7 into the housing 1, so that the wire harness 7 is always kept in a taut state.

[0026] Embodiment 2: The difference from Embodiment 1 is that a pair of sliding grooves 11 are provided on the housing 1, and the sliding grooves 11 are symmetrically arranged; both ends of the pulley group 6 are movably snapped into the sliding grooves 11 respectively. The pulley group 6 moves in the sliding groove 11 through the traction wire harness 7 to realize the storage of the wire harness 7. At the same time, the limited movement of the pulley group 6 can be realized, and the pulley group 6 can be prevented from detaching from the housing 1 during use; the pulley group 6 realizes the storage of the wire harness 7 by moving in the sliding groove 11 through the traction wire harness 7, which can avoid the problem of the wire harness 7 being wound and knotted, keep the wire harness 7 neat and orderly, and facilitate the management and maintenance of the wire harness 7.

[0027] A second convex column 51 is provided in the middle of the base 5, and threaded connection columns 53 are provided around it. The middle of the second convex column 51 is a through hole, and a barb groove 52 is also provided on the outer periphery; corresponding screws 8 are also threadedly connected to the threaded connection columns 53, and the screws 8 pass through the housing 1 and then connect to the threaded connection columns 53; a second barb 24 is provided on the inner wall of the wire rewinding disc 2, and a connection column 23 matched with the through hole is also provided in the middle; one end of the spiral spring piece 4 is provided with a first barb 41 structure, and the other end is provided with a square hole 42, wherein the first barb 41 structure is embedded in the barb groove of the base 5 for fixation, and the square hole 42 is correspondingly connected to the second barb 24 on the inner wall of the wire rewinding disc 2; one end of the pull rope is connected to the connection column 23 of the wire rewinding disc 2.

[0028] The connection column 23 in the middle of the wire rewinding disc 2 is connected to one end of the pull rope 3. When installing the wire rewinding disc 2, first embed one end of the spiral spring piece 4 with the first barb 41 structure into the barb groove 52 of the base 5 for fixation, and the other end with the square hole 42 is connected to the second barb 24 on the inner wall of the wire rewinding disc 2. Then, fix the base 5 to the corresponding hole positions on the housing 1 through the threaded connection columns 53 around it with screws 8. The connection is stable and reliable, avoiding the accidental detachment of the spring piece during use; when the wire rewinding disc 2 rotates, it will drive the spiral spring to tighten or loosen, realizing the accumulation and release of elastic force. At this time, through the cooperation between the rotating disc and the pull rope 3, the pull rope 3 pulls the pulley group 6 to realize tightening the wire harness 7 at different positions; the base 5 is tightly connected to the housing 1 through the threaded connection columns 53 and screws 8, ensuring the stable structure of the whole device. The stretching and recycling of the wire harness 7 are automatically controlled by the elastic force of the spiral spring piece 4, ensuring that the wire harness 7 is always in an appropriate tension state, neither too loose to cause entanglement nor too tight to cause damage; this design enables the wire harness 7 to stretch and recycle smoothly during the opening and closing of the skylight, reducing the risk of wear of the wire harness 7 and simplifying the management of the wire harness 7.

[0029] Embodiment 3: The difference from Embodiment 2 is that the pulley block 6 includes a rotating column and a pulley seat 62. The pulley seat 62 is a U-shaped seat, and both ends of the rotating column are rotatably clamped into the U-shaped seat. The top and bottom of the rotating column are respectively sliding bumps 61 that cooperate with the sliding groove 11, and a wire harness groove 63 for cooperating with the wire harness 7 is also provided in the middle of the rotating column. When the sunroof is opened, the wire harness 7 is pulled out as the sunroof moves, driving the pulley block 6 to move along the sliding groove 11 in a direction away from the base 5. During this process, the pulley block 6 smoothly slides in the sliding groove 11 through the sliding bumps 61 on the rotating column, and at the same time, the wire harness 7 moves along the wire harness groove 63 of the rotating column to realize the extension of the wire harness 7. When the sunroof is closed, the elastic force of the spiral spring piece 4 causes the pulley block 6 to move along the sliding groove 11 in the direction of the base 5, thereby retracting the wire harness 7 into the housing 1. The wire harness groove 63 on the side of the rotating column effectively guides the movement of the wire harness 7, preventing the wire harness 7 from knotting or winding during use, keeping the wire harness 7 neat and orderly, and at the same time reducing the possibility of damage to the wire harness 7, which is convenient for daily management and maintenance.

[0030] A spiral wire groove in a spiral shape is provided on the circumferential wall outside the wire transfer disc 2, and a straight wire groove 22 is provided on the top surface. A round hole 21 is provided at the center of the top surface of the wire transfer disc 2, and the round hole 21 is arranged in the middle of the rotating column. One end of the straight wire groove 22 communicates with the top of the spiral wire groove, and the other end communicates with the round hole 21. A first convex column 31 is provided at one end of the pull rope 3, and the first convex column 31 is correspondingly embedded into the first round hole 21 for fixed connection. Then, the pull rope 3 is installed along the straight wire groove 22 and the spiral wire groove in sequence. After the pull rope 3 is separated from the wire transfer disc 2, the other end is connected to the pulley block 6. During installation, the wire transfer disc 2 is installed on the base 5 to ensure that the round hole 21 in the middle of the wire transfer disc 2 matches the second convex column 51 in the middle of the base 5. Then, find the straight wire groove 22 and the spiral wire groove on the top surface of the wire transfer disc 2, embed the first convex column 31 at the end of the pull rope 3 into the round hole 21 on the top surface of the wire transfer disc 2 for fixation, then lay the pull rope 3 along the straight wire groove 22 and then along the spiral wire groove to ensure the correct arrangement of the pull rope 3 on the wire transfer disc 2. Finally, connect the other end of the pull rope 3 to the pulley block 6. During use, as the wire transfer disc 2 rotates, the pull rope 3 winds or unwinds along the spiral wire groove, driving the wire harness 7 to be stored in the housing 1 or extended outwards. Through the design of the spiral wire groove, it is ensured that the pull rope 3 is evenly distributed on the wire transfer disc 2, and even during the telescopic process of the wire harness 7, the pull rope 3 can maintain an orderly arrangement, avoiding the mess of the pull rope 3 on the wire transfer disc 2 and reducing the risk of knotting of the pull rope 3. The combined design of the straight wire groove 22 and the spiral wire groove ensures that the pull rope 3 can be quickly and accurately positioned and fixed on the wire transfer disc 2, simplifying the assembly process.

[0031] In the description of the present utility model, a large number of specific details are illustrated. However, it can be understood that the embodiments of the present utility model can be practiced without these specific details. In some instances, well-known methods, structures, and technologies are not shown in detail so as not to obscure the understanding of this description.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model, rather than to limit it; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present utility model, and they should all be covered within the scope of the claims and the description of the present utility model.

Claims

1. A wire harness telescopic system for a sliding member, characterized in that: It includes a housing (1), a wire winding disc (2), a pulling rope (3), a spiral spring piece (4), a base (5), a pulley block (6) and a wire harness (7), wherein the base (5) is detachably installed at one end of the housing (1); the wire winding disc (2) is rotatably installed on the base (5), a spiral spring piece (4) is installed in the middle of the wire winding disc (2), one end of the pulling rope (3) is fixedly connected to the outer periphery, wherein one end of the spiral spring piece (4) is fixedly connected to the inner wall of the wire winding disc (2), and the other end is fixedly connected to the base (5); the other end of the pulling rope (3) is fixedly connected to the pulley block (6), and the pulley block (6) is slidably installed in the housing (1); the wire harness (7) is connected to the pulley block (6).

2. The wire harness telescopic system of a sliding member according to claim 1, characterized in that: A pair of chutes (11) are provided on the housing (1), and the chutes (11) are symmetrically arranged; both ends of the pulley block (6) are respectively movably snapped into the chutes (11).

3. A wire harness telescopic system of a sliding member according to any one of claims 1 or 2, characterized in that: The pulley block (6) includes a rotating column and a pulley seat (62), wherein the pulley seat (62) is a U-shaped seat, and both ends of the rotating column are respectively rotatably snapped into the U-shaped seat; sliding bumps (61) for cooperating with the chutes (11) are respectively provided at the top and bottom of the rotating column, and a wire harness groove (63) for cooperating with the wire harness (7) is further provided in the middle of the rotating column.

4. The wire harness telescopic system of a sliding member according to claim 1, characterized in that: A second convex column (51) is provided in the middle of the base (5), and threaded connecting columns (53) are provided around it. A through hole is provided in the middle of the second convex column (51), and an inverted hook groove (52) is further provided on the outer periphery; corresponding screws (8) are also threadedly connected to the threaded connecting columns (53), and the screws (8) pass through the housing (1) and then connect to the threaded connecting columns (53); a second inverted hook (24) is provided on the inner wall of the wire winding disc (2), and a connecting column (23) for cooperating with the through hole is further provided in the middle; one end of the spiral spring piece (4) is provided with a first inverted hook (41) structure, and the other end is provided with a square hole (42), wherein the first inverted hook (41) structure is embedded into the inverted groove of the base (5) for fixation, and the square hole (42) is correspondingly connected to the second inverted hook (24) on the inner wall of the wire winding disc (2); one end of the pulling rope is connected to the connecting column (23) of the wire winding disc (2).

5. The wire harness telescopic system of a sliding member according to claim 4, characterized in that: A spiral wire groove in a spiral shape is provided on the circumferential wall outside the wire winding disc (2), a straight wire groove (22) is provided on the top surface, and a round hole (21) is provided at the center of the top surface of the wire winding disc (2), and the round hole (21) is provided in the middle of the rotating column; one end of the straight wire groove (22) communicates with the top of the spiral wire groove, and the other end communicates with the round hole (21); a first convex column (31) is provided at one end of the pulling rope (3), and the first convex column (31) is correspondingly embedded into the first round hole (21) for fixed connection, and then the pulling rope (3) is installed along the straight wire groove (22) and the spiral wire groove in sequence. After the pulling rope (3) detaches from the wire winding disc (2), the other end is connected to the pulley block (6).

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