阅读说明：本技术 放线牵引装置 (Paying-off traction device ) 是由 侯先智 郎福堂 杨屹东 刘立新 刘学文 张建波 刘振东 刘峰 赵万顺 应明凤 李 于 2021-07-27 设计创作，主要内容包括：本申请提供一种放线牵引装置,涉及电力施工装置领域。放线牵引装置,包括：两个牵引结构,其包括拉力板,拉力板的相对两侧边分别设置第一牵引部和第二牵引部,拉力板的至少一个表面平行且间隔的设置多个圆弧状长条凸棱,拉力板上于相邻的两个圆弧状长条凸棱之间转动连接有至少一个轴承,轴承的转动轴线与多个圆弧状长条凸棱的分布方向垂直；活动链,其数量为两个,活动链两端分别与两个拉力板的第一牵引部转动连接；防扭转链,其位于两个活动链之间,一端与一个拉力板的第一牵引部转动连接,另一端悬置。所述放线牵引装置的圆弧状长条凸棱能够与滑车的轮槽配合,轴承能够于滑车的轮缘上滚动,使放线牵引装置顺畅的通过滑车,避免卡顿的情况发生。(The application provides a unwrapping wire draw gear relates to the electric power construction device field. Unwrapping wire draw gear includes: the two traction structures comprise a tension plate, the two opposite side edges of the tension plate are respectively provided with a first traction part and a second traction part, at least one surface of the tension plate is provided with a plurality of arc-shaped long ribs in parallel and at intervals, at least one bearing is rotatably connected between every two adjacent arc-shaped long ribs on the tension plate, and the rotating axis of the bearing is vertical to the distribution direction of the arc-shaped long ribs; the two ends of the movable chain are respectively and rotatably connected with the first traction parts of the two tension plates; and the anti-torsion chain is positioned between the two movable chains, one end of the anti-torsion chain is rotationally connected with the first traction part of one tension plate, and the other end of the anti-torsion chain is suspended. Circular-arc rectangular bead of unwrapping wire draw gear can cooperate with the race of coaster, and the bearing can roll on the rim of coaster, makes smooth and easy the passing through coaster of unwrapping wire draw gear, avoids the condition of blocking to take place.)

1. A pay-off pulling device, comprising:

the traction structure comprises a tension plate, a first traction part and a second traction part are respectively arranged on two opposite side edges of the tension plate, a plurality of arc-shaped long ribs are arranged on at least one surface of the tension plate in parallel and at intervals, at least one bearing is rotatably connected between every two adjacent arc-shaped long ribs on the tension plate, and the rotating axis of the bearing is perpendicular to the distribution direction of the arc-shaped long ribs;

the arc-shaped long rib is matched with a wheel groove of the pulley, and the bearing is used for rolling on a wheel rim of the pulley;

the number of the movable chains is two, and two ends of each movable chain are respectively and rotatably connected with the first traction parts of the two tension plates;

the anti-torsion chain is positioned between the two movable chains, one end of the anti-torsion chain is rotationally connected with the first traction part of one tension plate, and the other end of the anti-torsion chain is suspended;

the second traction part of the tension plate connected with the anti-torsion chain is used for connecting a traction rope, and the second traction part of the other tension plate is used for connecting a rotary connector.

2. The payoff pulling apparatus as set forth in claim 1,

circular-arc rectangular bead with the bearing forms the direction motion portion, the both sides surface of pulling force board all is provided with the direction motion portion, just on the both sides surface of pulling force board circular-arc rectangular bead one-to-one, on the both sides surface of pulling force board the bearing one-to-one.

3. The pay-off line pulling apparatus as defined in claim 2, wherein the pulling structure further comprises:

the guide tile is an arc-shaped long shell, and at least two screw counter bores are arranged at intervals at the top position of an arc along the length direction of the guide tile;

the surfaces of two sides of the tension plate are provided with a plurality of lining blocks corresponding to the screw counter bores of the guide shoe, and the end parts of the lining blocks are provided with threaded holes;

the guide tile is arranged in the screw counter bore and the threaded hole in a penetrating mode through a screw and connected with the tension plate to form the arc-shaped long rib.

4. The pay-off pulling device as defined in claim 2 or 3, wherein the pulling structure further comprises:

the number of the supporting shafts is the same as that of the bearings, two ends of each supporting shaft are connected with the tension plate through supports, the supporting shafts are arranged at positions away from the side surface of the tension plate by preset distances, and the axial direction of each supporting shaft is perpendicular to the distribution direction of the arc-shaped long ribs;

wherein, the bearing is connected with the support shaft in a rotating way.

5. The payoff pulling apparatus as set forth in claim 4,

the bearing between two adjacent circular-arc rectangular beads is a plurality of, and it is a plurality of to correspond the connection the bearing a plurality of the one end of back shaft is fixed through same the support on the tension plate.

6. The payoff pulling apparatus as set forth in claim 4,

the supports at the two ends of the supporting shaft are positioned under the covers of the two adjacent guide tiles.

7. The payoff pulling apparatus as set forth in claim 1,

the active chain comprises a plurality of active sections;

the movable joint main body is a cylinder, the middle part of one end of the cylinder is provided with a connecting claw with a through hole, and the other end of the cylinder is provided with two connecting claws with through holes at intervals;

wherein, a plurality of movable joints are connected in turn by rotating shafts from head to tail.

8. The payoff pulling apparatus as set forth in claim 1, further comprising:

and one end of the connecting chain is connected with the anti-torsion chain, the second traction part of the tension plate is rotatably connected, and a connecting through hole is reserved at the other end of the connecting chain and used for connecting a traction rope.

9. The payoff pulling apparatus as set forth in claim 3, further comprising:

and the plugs are respectively plugged on two ports formed by the guide tiles oppositely arranged on the surfaces of the two sides of the tension plate.

10. The payoff pulling apparatus as set forth in claim 1,

the second traction parts for connecting the tension plates of the rotary connector are multiple, and each second traction part is provided with a connecting hole.

Technical Field

The application relates to the technical field of electric power construction devices, in particular to a paying-off traction device.

Background

Current transmission lines are erected in the air by electric towers and assume the important task of transmitting electric current.

In the tension paying-off process of the power transmission line, the power transmission line needs to be pulled in the air by a steel wire rope to pass through the pulleys of each electric tower so as to complete the paying-off of the lead. A special tool, a traction plate, is required for connecting the steel wire rope and the lead. However, when the conventional traction plate passes through the scooter, the conventional traction plate cannot pass through the scooter smoothly due to the self-structure, and the phenomenon that a steel wire rope jumps or passes through a jam is easily caused.

Therefore, further solution to the above technical problems is needed.

Disclosure of Invention

The invention mainly aims to provide a paying-off traction device, which can solve the technical problem that the conventional traction plate cannot smoothly pass through a pulley.

In order to solve the above technical problem, an embodiment of the present application provides the following technical solutions:

in one aspect the application provides a payoff pulling apparatus comprising:

the traction structure comprises a tension plate, a first traction part and a second traction part are respectively arranged on two opposite side edges of the tension plate, a plurality of arc-shaped long ribs are arranged on at least one surface of the tension plate in parallel and at intervals, at least one bearing is rotatably connected between every two adjacent arc-shaped long ribs on the tension plate, and the rotating axis of the bearing is perpendicular to the distribution direction of the arc-shaped long ribs;

the arc-shaped long rib is matched with a wheel groove of the pulley, and the bearing is used for rolling on a wheel rim of the pulley;

the number of the movable chains is two, and two ends of each movable chain are respectively and rotatably connected with the first traction parts of the two tension plates;

the anti-torsion chain is positioned between the two movable chains, one end of the anti-torsion chain is rotationally connected with the first traction part of one tension plate, and the other end of the anti-torsion chain is suspended;

the second traction part of the tension plate connected with the anti-torsion chain is used for connecting a traction rope, and the second traction part of the other tension plate is used for connecting a rotary connector.

The object of the present invention and the technical problems solved thereby can be further achieved by the following technical measures.

Alternatively, in the pay-off pulling apparatus, the circular arc-shaped elongated ribs and the bearings form guiding moving portions, the guiding moving portions are provided on both side surfaces of the tension plate, the circular arc-shaped elongated ribs on both side surfaces of the tension plate are opposite to each other, and the bearings on both side surfaces of the tension plate are opposite to each other.

Optionally, the paying-off pulling device further comprises:

the guide tile is an arc-shaped long shell, and at least two screw counter bores are arranged at intervals at the top position of an arc along the length direction of the guide tile;

the surfaces of two sides of the tension plate are provided with a plurality of lining blocks corresponding to the screw counter bores of the guide shoe, and the end parts of the lining blocks are provided with threaded holes;

the guide tile is arranged in the screw counter bore and the threaded hole in a penetrating mode through a screw and connected with the tension plate to form the arc-shaped long rib.

Optionally, the paying-off pulling device further comprises:

the number of the supporting shafts is the same as that of the bearings, two ends of each supporting shaft are connected with the tension plate through supports, the supporting shafts are arranged at positions away from the side surface of the tension plate by preset distances, and the axial direction of each supporting shaft is perpendicular to the distribution direction of the arc-shaped long ribs;

wherein, the bearing is connected with the support shaft in a rotating way.

Optionally, in the pay-off traction device, a plurality of bearings are disposed between two adjacent arc-shaped elongated ribs, and one end of each of the support shafts correspondingly connecting the plurality of bearings is fixed to the tension plate through the same support.

Alternatively, the pay-off pulling device may be arranged such that the support seats at both ends of the support shaft are located under the covers of two adjacent guide shoes.

Optionally, the payoff pulling apparatus as aforesaid, wherein said movable chain comprises a plurality of movable segments;

the movable joint main body is a cylinder, the middle part of one end of the cylinder is provided with a connecting claw with a through hole, and the other end of the cylinder is provided with two connecting claws with through holes at intervals;

wherein, a plurality of movable joints are connected in turn by rotating shafts from head to tail.

Optionally, the pay-off pulling device further includes:

and one end of the connecting chain is connected with the anti-torsion chain, the second traction part of the tension plate is rotatably connected, and a connecting through hole is reserved at the other end of the connecting chain and used for connecting a traction rope.

Optionally, the pay-off pulling device further includes:

and the plugs are respectively plugged on two ports formed by the guide tiles oppositely arranged on the surfaces of the two sides of the tension plate.

Optionally, in the pay-off pulling device, the second pulling portion for connecting the tension plate of the rotary connector is plural, and each of the second pulling portions is provided with a connecting hole.

By means of the technical scheme, the paying-off traction device at least has the following advantages:

according to the paying-off traction device provided by the embodiment of the invention, the two traction structures are connected through the movable chain, so that the paying-off traction device is integrally in a bendable and transformable state and can pull a power transmission line to slide from the pulley, and the surfaces of the tension plates of the two traction structures are respectively provided with the arc-shaped long-strip convex edge and the bearing, so that the arc-shaped long-strip convex edge can be matched with the wheel groove of the pulley, the bearing can roll on the rim of the pulley, the paying-off traction device can smoothly pass through the pulley, the occurrence of blocking is effectively avoided, and the occurrence of construction accidents is avoided; in addition, an anti-torsion chain is also hung between the movable chains, one end of the anti-torsion chain is connected with a tension plate connected with a traction rope, torsion is effectively avoided when the pay-off traction device passes through the pulley in a gravity falling mode, and the stability of the pay-off traction device passing through the pulley is further improved.

The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.

Drawings

The above and other objects, features and advantages of exemplary embodiments of the present application will become readily apparent from the following detailed description read in conjunction with the accompanying drawings. Several embodiments of the present application are illustrated by way of example and not by way of limitation in the figures of the accompanying drawings and in which like reference numerals refer to similar or corresponding parts and in which:

FIG. 1 schematically illustrates a top view of a pay-off line pulling apparatus;

FIG. 2 schematically illustrates a schematic view of a traction structure of a payoff traction device in engagement with a trolley;

FIG. 3 schematically illustrates a top view of another pay-off pulling device;

fig. 4 schematically shows a left side view of another payoff pulling device.

The reference numerals in fig. 1-4 are:

the traction structure 100, the tension plate 1, the first traction part 11, the second traction part 12, the lining block 13, the arc-shaped long rib 2, the bearing 3, the wheel groove L1, the wheel rim L2, the movable chain 4, the movable joint 41, the anti-torsion chain 5, the guide shoe 6, the support shaft 7, the support 8, the connecting chain 9 and the plug 10.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which this application belongs.

As shown in fig. 1 to 4, an embodiment of the present invention provides a pay-off pulling device, including:

the traction structure comprises two traction structures 100, each traction structure 100 comprises a tension plate 1, a first traction part 11 and a second traction part 12 are respectively arranged on two opposite side edges of each tension plate 1, at least one surface of each tension plate 1 is provided with a plurality of arc-shaped long ribs 2 in parallel and at intervals, at least one bearing 3 is rotatably connected between every two adjacent arc-shaped long ribs 2 on each tension plate 1, and the rotating axis of each bearing 3 is perpendicular to the distribution direction of the arc-shaped long ribs 2;

wherein, the arc-shaped long rib 2 is used for matching with a wheel groove L1 of a pulley, and the bearing 3 is used for rolling on a wheel flange L2 of the pulley;

the number of the movable chains 4 is two, and two ends of each movable chain 4 are respectively rotatably connected with the first traction parts 11 of the two tension plates 1;

the anti-torsion chain 5 is positioned between the two movable chains 4, one end of the anti-torsion chain 5 is rotatably connected with the first traction part 11 of one tension plate 1, and the other end of the anti-torsion chain 5 is suspended;

wherein the second traction part 12 of the tension plate 1 connected with the anti-torsion chain 5 is used for connecting a traction rope, and the second traction part 12 of the other tension plate 1 is used for connecting a rotary connector.

Specifically, the tension plate 1 of the traction structure 100 may be a rectangular plate, or may be a 6-edge plate that removes two corners of the same side (the side that removes the corner is required to be the side that sets the second traction portion 12 in the traction direction), so as to ensure the smoothness of passing through the pulley, and avoid two sharp corners from scraping on the rope of the pulley. The tension plate 1 is a plate body for bearing tension, and needs to have certain strength, and is preferably made of steel, but not limited to steel, as long as the strength is sufficient. The arc-shaped long rib 2 on the side surface of the tension plate 1 can be integrally formed with the tension plate 1 or formed by post-assembling through a bolt or welding mode, and the arc of the arc-shaped long rib 2 can be half of an oblong so as to be suitable for matching with the wheel groove L1 of the pulley. The deep groove ball bearing 3 can be selected as the bearing 3 between two adjacent arc-shaped long ribs 2 on the side surface of the tension plate 1, and then the bearing 3 is connected with the bearing by arranging a fixed rotating shaft, so that the free rotation of the bearing 3 is realized, wherein the height of the bearing 3 protruding out of the side surface of the tension plate 1 is smaller than the height of the arc-shaped long ribs 2, so that when the arc-shaped long ribs 2 are matched with the wheel groove L1 of the pulley, the bearing 3 can contact with the wheel rim L2 and roll smoothly when passing through the pulley.

The first traction part 11 and the second traction part 12 arranged at two opposite sides of the tension plate 1 are two sides of the tension plate 1 along the length direction of the arc-shaped elongated rib 2, the first traction part 11 and the second traction part 12 are mainly structured so as to be convenient for connecting a traction rope and connecting a rotary connector, namely, the first traction part 11 and the second traction part 12 are preferably provided with connecting through holes.

The movable chain 4 may be any chain body capable of rotating and bending and sliding along the surface of the pulley, but it should be noted that the cross-sectional dimension of the movable chain 4 is preferably smaller than the accommodation dimension of the pulley groove L1, so that the movable chain 4 can enter the pulley groove L1 after the traction structure 100 passes through the pulley, and the sliding separation is avoided.

The structure of the anti-twist chain 5 may be the same as that of the movable chain 4, or the structure of a single link may be different from that of the movable chain 4, provided that the anti-twist chain 5 has a chain body structure. It should be noted that the torsion preventing chain 5 is required to have a certain weight of falling down, so the length of the torsion preventing chain 5 cannot be too short, and can be set to be similar to the length of the movable chain 4, but preferably not to exceed the length of the movable chain 4.

According to the paying-off traction device provided by the embodiment of the invention, the two traction structures 100 are connected through the movable chain 4, so that the whole paying-off traction device is in a bendable transformation state and can pull a power transmission line to slide from a pulley, and the surfaces of the tension plates 1 of the two traction structures 100 are respectively provided with the arc-shaped long rib 2 and the bearing 3, so that the arc-shaped long rib 2 can be matched with a wheel groove L1 of the pulley, the bearing 3 can roll on a wheel rim L2 of the pulley, and further the paying-off traction device can smoothly pass through the pulley, the occurrence of blocking is effectively avoided, and the occurrence of construction accidents is avoided; in addition, an anti-torsion chain 5 is also hung between the movable chains 4, one end of the anti-torsion chain 5 is connected with the tension plate 1 connected with the traction rope, and the paying-off traction device is effectively prevented from torsion when passing through the pulley in a gravity falling mode, so that the stability of the paying-off traction device passing through the pulley is further improved.

As shown in fig. 2, in an embodiment in which the arc-shaped elongated ribs 2 (formed by guide shoes 6, only the guide shoes 6 are labeled here to avoid the problem of non-uniform reference numerals) and the bearings 3 form guide moving portions, the guide moving portions are provided on both side surfaces of the tension plate 1, the arc-shaped elongated ribs 2 on both side surfaces of the tension plate 1 are opposite to each other, and the bearings 3 on both side surfaces of the tension plate 1 are opposite to each other.

Specifically, the arc-shaped long rib 2 and the bearing 3 are arranged on the two side surfaces of the tension plate 1, so that when the paying-off traction device is used for traction of a power transmission line, the front side and the back side of the traction structure 100 do not need to be divided, and the paying-off traction device is convenient to use; and, when the unwrapping wire in the mountain area, because the problem of wire raise often can take place, the next level iron tower coaster that unwrapping wire draw gear passes through is lower than the last level iron tower coaster promptly, so in order to prevent that the wire that transmits electricity is unsettled in this coaster department, can set up a set of overhead tackle (the coaster anchor is subaerial, rather than hanging on the iron tower), when unwrapping wire draw gear passes through the overhead tackle like this, because both surfaces of pulling force board 1 all have circular-arc rectangular bead 2 and bearing 3, then the smooth and easy coaster that passes through this overhead tackle that passes through.

As shown in fig. 2, in a specific implementation, the traction structure 100 of the pay-off traction device provided in the embodiment of the present invention further includes:

the guide bush 6 is an arc-shaped long shell, and at least two screw counter bores are arranged at intervals at the top position of an arc along the length direction of the guide bush 6; the surfaces of the two sides of the tension plate 1 are provided with a plurality of lining blocks 13 corresponding to the screw counter bores of the guide shoe 6, and the end parts of the lining blocks 13 are provided with threaded holes; the guide tile 6 is arranged in the screw counter bore and the threaded hole in a penetrating mode through a screw and connected with the tension plate 1 to form the arc-shaped long rib 2.

In particular, the guide shoe 6 in the form of a housing can effectively reduce the overall weight of the towing structure 100, and at the same time, the assembly and disassembly of the towing structure 100 is facilitated by means of the screw connection, which facilitates the subsequent maintenance work.

The number of screw counter bores arranged along the length direction of the guide shoe 6 can be two or three, so as to ensure that the guide shoe 6 can be tightly fixed on the tension plate 1 through screws. The pads 13 arranged on the tension plate 1 need to correspond to the screw counter bores of the guide shoes 6, i.e. a row of pads 13 corresponding to the screw counter bores is arranged, and each pad 13 is provided with a threaded hole corresponding to the number of the screw counter bores on the guide shoes 6, so that a plurality of pads 13 can be screwed with a plurality of guide shoes 6. The pads 13 on the tension plate 1 may be fixed to the tension plate 1 by welding, and for the stability of the connection, the guide shoe 6 may be welded to the pads 13 after the guide shoe 6 is connected to the tension plate 1.

As shown in fig. 2, in a specific implementation, the traction structure 100 of the pay-off traction device provided by the embodiment of the present invention further includes:

the number of the support shafts 7 is the same as that of the bearings 3, two ends of each support shaft 7 are connected with the tension plate 1 through supports 8, the support shafts 7 are arranged at positions away from the side surface of the tension plate 1 by preset distances, and the axial direction of each support shaft 7 is perpendicular to the distribution direction of the arc-shaped long ribs 2; wherein, the bearing 3 is rotatably connected with the supporting shaft 7.

Specifically, the supporting shaft 7 and the support 8 can be connected in a clamping manner, that is, the support 8 can be two parts, each part is provided with a groove, the first part is arranged on the tension plate 1, the second part is buckled on the first part, the supporting shaft 7 is clamped by the two grooves, bolts sequentially penetrate through the second part and the first part and then are connected with the tension plate 1, and therefore fixing of the supporting shaft 7 is achieved, and the supporting shaft 7 is arranged at a preset distance from the side surface of the tension plate 1. The bearing 3 is pre-sleeved with the support shaft 7 before the support shaft 7 is connected with the support 8, and is preferably sleeved in an interference manner, so that the inner ring of the bearing 3 is fixed relative to the support shaft 7, and the outer ring can rotate freely.

As shown in fig. 1 to 4, in an implementation, a plurality of bearings 3 are provided between two adjacent arc-shaped elongated ribs 2, and one ends of a plurality of support shafts 7 correspondingly connecting the plurality of bearings 3 are fixed to the tension plate 1 through the same support 8.

Specifically, the number of the bearings 3 between two adjacent circular arc-shaped elongated ribs 2 may be two or three or more, and may be determined according to the size of the traction structure 100. For the convenience of installation, the support 8 can preferably fix a plurality of support shafts 7 between two adjacent arc-shaped long ribs 2 in sequence, for example, the first part and the second part of the support 8 can be provided with grooves with the same number as the support shafts 7 to be installed, so that when the first part and the second part are buckled together, a groove hole capable of installing the plurality of support shafts 7 is formed, the support 8 can also be connected with the tension plate 1 through two bolts penetrating through positions close to two ends, the whole structure is simple, and the installation is convenient.

In the embodiment shown in fig. 2, the support 8 at both ends of the support shaft 7 is located under the cover of two adjacent guide shoes 6.

In particular, relief areas can be provided on the sides of the guide shoe 6, so that the abutment 8 can be positioned without interference with the guide shoe 6 and under the cover of the guide shoe 6.

As shown in fig. 1, 3 and 4, in a specific implementation, wherein the activity chain 4 comprises a plurality of activity links 41; the main body of the movable joint 41 is a cylinder, the middle part of one end of the cylinder is provided with a connecting claw with a through hole, and the other end of the cylinder is provided with two connecting claws with through holes at intervals; wherein, a plurality of the movable joints 41 are connected in sequence by rotating shafts.

Specifically, one end of the rotating shaft may be a cap having a size larger than that of the shaft body, the other end may pass through the connecting claws of the two movable joints 41 at a time, and the other end may be provided with a pin hole, by which the rotating shaft is prevented from being disengaged, or may be provided with a thread at the other end, by which the disengagement is prevented by screwing a bolt. And the connection mode in the prior art can be referred to for connection and fixation, and spacing anti-separation. Wherein, the movable joint 41 is provided with a cylindrical shape, which can facilitate the movable chain 4 to be matched with the wheel groove L1 of the pulley and to smoothly pass through the wheel groove L1.

As shown in fig. 3 and 4, in a specific implementation, the pay-off pulling device provided by the embodiment of the present invention further includes:

the connecting chain 9, the one end of connecting chain 9 with what the anti-twist chain 5 was connected the second traction portion 12 rotates and connects the pulling force board 1, connect the other end of connecting chain 9 reserves connect hole for connect the haulage rope.

Specifically, the structure of the connecting chain 9 can refer to the movable chain 4, and can also refer to the structure of a conventional bicycle chain, which is not described in detail herein.

As shown in fig. 1, fig. 3 and fig. 4, in a specific implementation, the pay-off pulling device provided by the embodiment of the present invention further includes:

and the plugs 10 are respectively plugged on two ports formed by the guide shoes 6 oppositely arranged on the surfaces of the two sides of the tension plate 1.

Specifically, the plug 10 may be in the form of a spherical cap, as long as it can plug the ports at the two ends of the two oppositely disposed guide shoes 6, so as to form the smooth shape of the traction structure 100 for passing through the pulley, and prevent the dirt from entering.

As shown in fig. 1 and 3, in the embodiment, the second pulling portion 12 of the tension plate 1 for connecting the rotary connector is plural, and each of the second pulling portions 12 is provided with a connecting hole.

Specifically, the plurality of second traction portions 12 are arranged and adapted to the connection holes, so that the connector can be conveniently connected with an existing rotary connector, and a convenient use effect is achieved.

It will be appreciated that the relevant features of the devices described above may be referred to one another. In addition, "first", "second", and the like in the above embodiments are for distinguishing the embodiments, and do not represent merits of the embodiments.

In the description provided herein, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known structures and techniques have not been shown in detail in order not to obscure an understanding of this description.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.