CN115632347A

CN115632347A - Power line concealed wire installation threading device of building and installation method thereof

Info

Publication number: CN115632347A
Application number: CN202211271158.3A
Authority: CN
Inventors: 苏文扬; 张丽坪; 庄海河
Original assignee: CNNC Huachen Engineering Management Co Ltd
Current assignee: CNNC Huachen Engineering Management Co Ltd
Priority date: 2022-10-17
Filing date: 2022-10-17
Publication date: 2023-01-20

Abstract

The application discloses power cord hidden line installation threading device and installation method of building, relate to the technical field of power cord threading, the problem of the condition that steel wire and electric wire break away from has been improved, including two go-between, the mounting hole has on the go-between, the periphery side of go-between is offered and is used for power supply line or steel wire to get into the breach in the mounting hole, fixedly connected with guide arm on the periphery side of go-between, the closed ring that is used for sealing the breach has still been cup jointed on the go-between outer wall, closed ring and go-between can dismantle the connection, be provided with connection structure between two closed rings, connection structure includes a plurality of stay cord, the one end and the closed ring of stay cord are connected, the other end and another closed ring of stay cord are connected, the stay cord is provided with a plurality ofly along closed ring circumference. The condition that breaks away from appears in the steel wire and electric wire of this application, can also keep the relation of connection between two go-between, makes electric wire and steel wire form the relation of connection indirectly to make the steel wire still can take the electric wire to pass the installation pipe.

Description

Power line concealed wire installation threading device of building and installation method thereof

Technical Field

The application relates to the technical field of power line threading, in particular to a power line concealed wire installation threading device and an installation method of the power line concealed wire installation threading device.

Background

When a power supply circuit is installed in a building, the power supply circuit is basically installed in a hidden line, and from the safety perspective, if an open-mounted wire is subjected to an accident, the probability of direct contact with a human body is increased, and the damage rate is high. The wires are hidden and the aging of the wires is slower.

When the hidden line is installed, the installation pipe is generally pre-buried, then the steel wire penetrates through the installation pipe firstly, then one end of the electric wire is bound on the steel wire, and then the steel wire is pulled back to enable the steel wire to take the electric wire to penetrate through the installation pipe. One end of the steel wire connected with the electric wire is usually wound by a circle, so that the steel wire can conveniently move along the pipeline and the electric wire can be conveniently bound on the steel wire.

In view of the above-mentioned related art, the inventor believes that if the turning point of the installation pipe is relatively large during the wire guiding process of the steel wire, the swing of the steel wire and the electric wire is relatively large, and the steel wire and the electric wire are separated.

Disclosure of Invention

In order to reduce the situation that a steel wire and an electric wire are completely separated when the steel wire pulls the electric wire, the application provides a power line concealed wire installation threading device and an installation method of the power line concealed wire installation threading device.

First aspect, the application provides a power cord hidden line installation threading device of building, adopts following technical scheme:

a power line hidden line installation threading device of a building comprises two connecting rings, wherein mounting holes for installing electric wires or steel wires are formed in the connecting rings, notches for enabling the electric wires or the steel wires to enter the mounting holes are formed in the peripheral sides of the connecting rings, guide rods are fixedly connected to the peripheral sides of the connecting rings and are uniformly arranged at intervals along the circumferential direction of the connecting rings, sliding portions are arranged at one ends, away from the connecting rings, of the guide rods, closed rings for closing the notches are further sleeved on the outer walls of the connecting rings, the closed rings are detachably connected with the connecting rings, a connecting structure is arranged between the two closed rings and comprises a plurality of pull ropes, one end of each pull rope is fixedly connected with one closed ring, the other end of each pull rope is connected with the other closed ring, and the plurality of pull ropes are arranged along the circumferential direction of the closed rings; the connecting structure comprises a first connecting state and a second connecting state, wherein the two connecting rings are coaxially attached together, and the second connecting state enables the two connecting rings to be far away from each other.

By adopting the technical scheme, before the steel wire enters the installation pipe, the two connection rings are firstly installed on the steel wire, then the notches of the connection rings are sealed by the fixing rings, when the connection rings enter the installation pipe along with the steel wire, the connection rings are positioned in the middle position of the installation pipe by the aid of the guide rods, and when the steel wire moves in the installation pipe, the guide rods can play a certain guiding role on the steel wire, so that the steel wire can smoothly pass through the installation pipe;

when the wire passes through the installation tube, the wire is wound around the wire winding, then the two connection rings are adjusted to a second connection state which is away from each other, one of the connection rings is detached from the wire, and the detached connection ring is installed on the wire, so that the portion where the wire and the wire are connected with each other is positioned between the two connection rings.

Optionally, the inner wall of the closed ring is fixedly connected with guide blocks, the outer wall of the connecting ring is provided with guide grooves for the guide blocks to slide in, the guide blocks are arranged at intervals along the circumferential direction of the closed ring, and the guide grooves correspond to the guide blocks one to one.

Through adopting above-mentioned technical scheme, the cooperation of guide block and guide slot can play the guide effect to the slip of closed ring on the go-between.

Optionally, a holding groove for holding the pull rope is formed in the closed ring, the holding groove is arranged along the axial direction of the closed ring in an inclined manner, the two ends of the pull rope are connected with the slider, the slider is slidably mounted in the holding groove, a limiting block is arranged at one end of the holding groove, and when the two connecting rings are coaxially attached together, the slider extends out of the holding groove and forms a butt joint relation with the end face of the closed ring.

By adopting the technical scheme, when the two connecting rings are coaxially attached together, the accommodating groove can be used for accommodating part of the pull rope, so that the pull rope can be accommodated,

optionally, the connecting structure further includes a positioning strip, the positioning strip is mounted on the pull rope, two ends of the positioning strip are respectively and fixedly connected with the two sliding blocks of the pull rope, the positioning strip extends along the length direction of the pull rope, and the positioning strip is made of flexible material.

By adopting the technical scheme, the flexibility means that an object deformed by stress cannot recover the original shape after the force is removed and the shape of the object is unchanged compared with the shape after the deformation, when the two connecting rings are coaxially attached together in a first connecting state, because the positioning strip is made of flexible materials, under the condition that the stay cord is not pushed by external force, the distribution direction of the stay cord between the two connecting rings and the direction in which the two connecting rings are far away from each other form a triangular structure, so that the two connecting rings are not easy to be far away from each other; only the external force limit promotes the slider and is keeping away from each other in the holding tank slip side, and two go-between just can separate gradually and form the second connection state, also because the flexibility of location strip, can buckle the location strip and make the slider butt on the terminal surface of closed ring to the both ends that make the stay cord are fixed also can carry out further fixed to two go-between.

Optionally, the outer peripheral side of the closed ring is fixedly connected with a clamping block, a clamping groove used for being clamped with the guide rod is formed in the clamping block, a notch of the clamping groove is smaller than the outer diameter of the guide rod, and the clamping block corresponds to the guide rod one by one.

Through adopting above-mentioned technical scheme, the closed loop can form fixed connection through joint piece and guide arm and be concerned with, and the joint piece also can play the guard action to the connecting portion between guide arm and the go-between.

Optionally, the connecting ring is made of rubber, and the sealing ring is made of rigid material.

By adopting the technical scheme, the sealing ring is connected with the guide rods, and the connecting ring and the sealing ring can be coaxially arranged, so that the guide rods can be radially distributed at the circle center of the connecting ring.

Optionally, the guide rod is a telescopic rod, the guide rod comprises an outer rod and an inner rod, the inner rod is in threaded connection with the outer rod, and the outer rod is fixedly connected with the connecting ring.

Through adopting above-mentioned technical scheme, the telescopic guide bar can adapt to the installation pipe of different pipe diameters better.

In a second aspect, the present application provides a method for installing a hidden line and a cable of a power line of a building, which adopts the following technical scheme:

a steel wire is simultaneously installed on two connecting rings, a closed ring is installed on the connecting rings, the two connecting rings are firstly coaxially attached together by using a connecting structure, the steel wire penetrates through an installation pipe, one connecting ring is detached from the steel wire after the steel wire penetrates through the installation pipe, the connecting rings are installed on the electric wire, then the closed ring is installed on the connecting rings again, the electric wire and the steel wire are connected with each other, and a connecting portion is located between the two connecting rings.

Through adopting above-mentioned technical scheme, the guide arm of two go-between can both be to its guide effect of steel wire when the steel wire passes the installation pipe alone, when steel wire and connection of electric lines were put together, the connecting portion of steel wire and electric wire were located between two go-between, link together through the stay cord between the two closed rings, if steel wire and electric wire when breaking away from in the installation pipe, steel wire and electric wire are difficult for breaking away from the go-between, and steel wire and electric wire can link together through connection structure is indirect, make the steel wire also can play the guide effect to the electric wire.

In summary, the present application includes at least one of the following benefits:

1. when the two connecting rings are simultaneously arranged on the steel wire, the steel wire can smoothly pass through the installation rod, when the two connecting rings are respectively arranged on the steel wire and the electric wire, the joint between the steel wire and the electric wire is positioned between the two connecting rings, and when the joint between the steel wire and the electric wire and the two connecting rings pass through the turning part of the installation pipe, a certain degree of bending state can be formed, so that the steel wire and the electric wire can smoothly pass through the installation pipe;

2. if the steel wire and the electric wire are separated, when the steel wire and the electric wire are not easy to separate from the connecting rings, the connecting relationship between the two connecting rings can be kept, so that the electric wire and the steel wire can indirectly form the connecting relationship, and the steel wire can still carry the electric wire to pass through the mounting pipe.

Drawings

FIG. 1 is a schematic diagram of the overall structure of an embodiment of the present application;

FIG. 2 is a sectional view of the embodiment of the present application showing the pull rope and the accommodating groove;

FIG. 3 is an enlarged schematic view at A of FIG. 2;

FIG. 4 is a schematic structural view of the embodiment of the present application showing the slider located outside the receiving groove when the two connecting rings are coaxially attached;

FIG. 5 is a schematic view of the embodiment of the present application showing that the pulling rope is accommodated in two accommodating grooves;

fig. 6 is an enlarged schematic view at B of fig. 5.

Description of the reference numerals: 1. a connecting ring; 11. mounting holes; 12. a notch; 13. a guide groove; 2. a closed ring; 21. accommodating a tank; 22. a limiting block; 23. a clamping block; 3. a guide bar; 31. an outer pole; 32. an inner rod; 4. pulling a rope; 41. a slider; 5. a guide block; 6. a ball bearing; 7. an electric wire; 8. a steel wire.

Detailed Description

The present application is described in further detail below with reference to figures 1-6.

The embodiment of the application discloses power cord hidden line installation threading device of building. Referring to fig. 1, the hidden line installation and threading device for the power line of the building comprises two connecting rings 1, wherein the connecting rings 1 are provided with installation holes 11 used for clamping electric wires 7 or steel wires 8, and the central axes of the installation holes 11 and the central axes of the connecting rings 1 are superposed. The outer periphery of the connection ring 1 is provided with a notch 12 for the power supply line 7 or the steel wire 8 to enter the mounting hole 11, and the power supply line 7 or the steel wire 8 can enter the mounting hole 11 along the radial direction of the connection ring 1 through the notch 12. The connecting ring 1 is provided with a closed ring 2 for closing the notch 12, and the closed ring 2 is detachably arranged on the connecting ring 1. The outer wall of the connecting ring 1 is also fixedly connected with three guide rods 3, and the three guide rods 3 are uniformly arranged along the circumferential direction of the connecting ring 1 at intervals. The closed ring 2 and the guide rod 3 are detachably connected. The connecting ring 1 is positioned through the guide rod 3, so that when the connecting ring 1 slides in the installation pipe, the connecting ring 1 and the installation pipe can basically keep a coaxial state, the friction force between the connecting ring 1 and the installation pipe can be reduced, and the connecting ring 1 can drive a steel wire 8 or an electric wire 7 to smoothly pass through the installation pipe.

The connecting structure is arranged between the two closed rings 2, the connecting structure can enable the two connecting rings 1 to form a whole, when the two connecting rings 1 are respectively installed on the steel wire 8 or the electric wire 7, if the electric wire 7 and the steel wire 8 are mutually separated, the end parts of the steel wire 8 and the electric wire 7 are wound into a bend, the steel wire 8 and the electric wire 7 are not easy to pass through the installation hole 11 to be separated from the connecting rings 1, the steel wire 8 and the electric wire 7 can also form a connection relation due to the connection structure, and therefore the steel wire 8 can also guide the electric wire 7 to pass through the installation pipe.

Referring to fig. 1 and 2, the connection structure includes a plurality of strings 4, and three strings 4 are provided in the embodiment of the present application. A plurality of pull ropes 4 are distributed along the circumferential direction of the closed ring 2. The two ends of the pull rope 4 are respectively connected with a sliding block 41, one end of the pull rope 4 is connected with one of the closed rings 2 in a sliding mode, and the other end of the pull rope 4 is connected with the other closed ring 2 in a sliding mode. The end face of the closed ring 2 is provided with a containing groove 21 for containing the pull rope 4 and allowing the sliding block 41 to slide, and the sliding block 41 is slidably installed in the containing groove 21. The accommodating groove 21 is obliquely arranged along the axial direction of the closed ring 2, and the accommodating groove 21 penetrates from one axial end face of the closed ring 2 to the other axial end face of the closed ring 2. The accommodating groove 21 has a straight groove structure.

Referring to fig. 2 and 3, the inner wall of one end of each accommodating groove 21 is fixedly connected with a limiting block 22, the limiting blocks 22 of the two accommodating grooves 21 are close to each other, the sliding block 41 does not continue to slide when being abutted to the limiting blocks 22, and the limiting blocks 22 intercept the sliding block 41. When the two sliders 41 on one pull rope 4 abut against the limiting blocks 22 respectively, the length direction of the pull rope 4 is the same as the axial direction of the closed ring 2, and the distance between the two connecting rings 1 is the largest. When one end of the electric wire 7 is bound on the steel wire 8, the two connection rings 1 are respectively arranged on the electric wire 7 and the steel wire 8, the two connection rings 1 are far away from each other, and the pull rope 4 between the two connection rings 1 is in a loose state.

Referring to fig. 3 and 4, when the sliders 41 at both ends of the pulling rope 4 are gradually separated from the stopper 22 along the receiving groove 21, the two connecting rings 1 are gradually close to each other, and when the two connecting rings 1 are coaxially attached together, the sliders 41 slide out of the receiving groove 21.

Referring to fig. 5 and 6, the connection structure further includes a positioning bar (not shown), the positioning bar is fixedly mounted on the pulling rope 4, a length direction of the positioning bar extends along a length direction of the pulling rope 4, and two ends of the positioning bar are respectively fixedly connected to the sliding blocks 41. The spacer is made of a flexible material, such as a wire. Flexibility refers to the property that an object deformed by a force cannot recover the original shape after the force is removed, and the shape is not changed after the deformation is kept. After the slider 41 extends out of the accommodating groove 21, the slider 41 can abut against the end surface of the closed ring 2 by bending the positioning strip, so that the two connecting rings 1 keep the first connecting state.

Referring to fig. 6, when the slider 41 abuts on the end face of the closed loop 2, the pull cord 4 is also accommodated in the accommodation groove 21. The pull rope 4 is bent into two ends and is respectively positioned in the two closed rings 2, the direction in which the two connecting rings 1 are far away from each other is the axial direction of the connecting rings 1, and the direction in which the two connecting rings 1 are far away from each other and the distribution direction of the two ends of the pull rope 4 form a triangular structure, so that the two connecting rings 1 cannot be easily separated when being coaxially attached together. Therefore, when the two connecting rings 1 are attached to the steel wire 8, the positioning effect of the guide rod 3 on the steel wire 8 can be further improved. When the two connection rings 1 need to be separated from each other, an external force needs to be applied to the slider 41 and the connection rings 1 at the same time, the connection rings 1 move towards the direction away from the other connection ring 1, the slider 41 approaches the limiting block 22 along the accommodating groove 21, so that the two connection rings 1 are separated from each other, and when the slider 41 abuts against the limiting block 22, the two connection rings 1 form a second connection state. Install the pull ring on the slider 41, when slider 41 still slided in holding tank 21, in order to drive slider 41 more fast and leave holding tank 21, can stretch into in holding tank 21 and hook into the pull ring with the iron wire, make things convenient for the better application of force to slider 41 of people.

Referring to fig. 1, the inner wall of the closed ring 2 is fixedly connected with guide blocks 5, the outer wall of the connecting ring 1 is provided with guide grooves 13 for the guide blocks 5 to slide in, the guide blocks 5 are arranged at intervals along the circumferential direction of the closed ring 2, and the guide grooves 13 correspond to the guide blocks 5 in number one to one. The closed ring 2 can be accurately slid into the connecting ring 1 through the guide block 5, the thickness of the closed ring 2 is increased by the guide block 5, and the accommodating groove 21 is formed in the closed ring 2 close to the guide block 5.

Referring to fig. 1, the outer circumference of the closed ring 2 is fixedly connected with clamping blocks 23, and the clamping blocks 23 correspond to the guide rods 3 one by one. Offer the draw-in groove that is used for with 3 joints of guide arm on the joint piece 23, the notch of draw-in groove is less than 3 external diameters of guide arm, makes 3 joints of guide arm when the joint inslot, and 3 difficult joints 23 that leave of guide arm. The clamping block 23 is made of plastic with certain deformability, so that the guide rod 3 can be clamped into or separated from the clamping block 23.

Referring to fig. 1, the guide rod is a telescopic rod, the guide rod includes an outer rod 31 and an inner rod 32, and the outer rod 31 is fixedly installed on the outer wall of the connection ring 1. The inner rod 32 is screwed on the outer rod 31, and the length of the guide rod can be adjusted by rotating the inner rod 32. The section of the guide rod far away from the connecting ring 1 is provided with a sliding part which is a ball 6, and the ball 6 is arranged on the inner rod 32 in a rolling way. The guide rod can reduce the friction force when the guide rod moves in the installation tube through the sliding part.

It should be added that the inner wall of the mounting hole 11 of the connection ring 1 may be filled with a sponge layer, so that the mounting hole 11 of the connection ring 1 may be clamped with the wires 7 or steel wires 8 having different inner diameters. The connection ring 1 is made of rubber, so that the notch 12 of the connection ring 1 can be properly deformed to adapt to the outer diameter of the steel wire 8 or the electric wire 7. The closed ring 2 is of a rigid structure, and the closed ring 2 is detachably connected with the guide rod 3, so that the closed ring 2 can also play a shaping role on the connecting ring 1, and the connecting ring 1 is kept in an original state after the electric wire 7 or the steel wire 8 is installed in the installation hole 11.

The implementation principle of the power cord concealed wire installation threading device of the building is as follows:

the two connecting rings 1 are arranged on the steel wire 8, the notches 12 of the connecting rings 1 are sealed by the fixing rings, when the connecting rings 1 enter the installation pipe along with the steel wire 8, the connecting rings 1 are positioned in the middle position of the installation pipe through the guide rods 3, and when the steel wire 8 moves in the installation pipe, the guide rods 3 can play a certain role in guiding the steel wire 8, so that the steel wire 8 can smoothly pass through the installation pipe; after the wire 8 passes through the installation tube, the wire 7 is wound around the wire 8, and then the two connection rings 1 are adjusted to a second connection state in which they are spaced apart from each other, and one of the connection rings 1 is detached from the wire 8, and the detached connection ring 1 is installed on the wire 7 such that the portion where the wire 7 and the wire 8 are connected to each other is located between the two connection rings 1, when the wire 8 pulls the wire 7 into the installation tube, the connection rings 1 spaced apart from each other can make the connection portion of the wire 7 and the wire 8 less likely to come into contact with the inner wall of the installation tube, and if the wire 7 and the wire 8 are separated from each other, the wire 7 and the wire 8 are not likely to leave the connection rings 1 because the end portions have windings, and the two connection rings 1 are also formed integrally by the pulling rope 4, so the wire 8 can still pull the wire 7 through the installation tube, and the guide bar can maintain the guidance of the wire 7 and the wire 8, and the wire 7 can smoothly pass through the installation tube.

The embodiment of the application also discloses an installation method for the hidden line installation threading of the power line of the building.

The utility model provides a power cord hidden line installation threading installation method of building, adopt above-mentioned threading device, install steel wire 8 on two go-between 1 simultaneously, closed ring 2 is installed on go-between 1, with connection structure earlier with two go-between 1 coaxial laminating together, firstly pass the installation pipe with steel wire 8, one of them go-between 1 dismantles from steel wire 8 after steel wire 8 passes the installation pipe, and install go-between 1 on electric wire 7, install closed ring 2 again in go-between 1, electric wire 7 and steel wire 8 interconnect and connecting portion are located between two go-between 1, when steel wire 8 pulls electric wire 7 and removes in the installation pipe, steel wire 8 can be directly to the application of force of electric wire 7, steel wire 8 also can be through the relation of connection of two go-between 1 to the application of force of electric wire 7, thereby make electric wire 7 in the installation pipe can be pulled by steel wire 8 all the time.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides a power cord hidden line installation threading device of building which characterized in that: the connecting device comprises two connecting rings (1), wherein the connecting rings (1) are provided with mounting holes (11) for mounting electric wires (7) or steel wires (8), the peripheral sides of the connecting rings (1) are provided with notches (12) for the power supply wires (7) or the steel wires (8) to enter the mounting holes (11), the peripheral sides of the connecting rings (1) are fixedly connected with guide rods (3), the guide rods (3) are uniformly arranged at intervals along the circumferential direction of the connecting rings (1), one ends, far away from the connecting rings (1), of the guide rods (3) are provided with sliding parts, the outer walls of the connecting rings (1) are further sleeved with closed rings (2) for sealing the notches (12), the closed rings (2) are detachably connected with the connecting rings (1), a connecting structure is arranged between the two closed rings (2), the connecting structure comprises a plurality of pull ropes (4), one end of each pull rope (4) is connected with one closed ring (2), the other end of each pull rope (4) is connected with the other closed ring (2), and the pull ropes (4) are arranged in the circumferential direction of the closed rings (2); the connecting structure comprises a first connecting state and a second connecting state, wherein the two connecting rings (1) are coaxially attached together, and the two connecting rings (1) are far away from each other.

2. The concealed power line installation threading device for the building, according to claim 1, is characterized in that: the inner wall fixedly connected with guide block (5) of closed ring (2), guide slot (13) that are used for supplying guide block (5) to slide in are seted up to the outer wall of go-between (1), and guide block (5) are provided with a plurality ofly along the circumference interval of closed ring (2), and guide slot (13) and guide block (5) one-to-one.

3. The concealed power line installation threading device for the building as claimed in claim 2, wherein: offer holding tank (21) that is used for holding stay cord (4) on closed ring (2), axial slope setting along closed ring (2) is followed in holding tank (21), the both ends of stay cord (4) are connected with slider (41), slider (41) slidable mounting is in holding tank (21), the one end of holding tank (21) is provided with stopper (22), when two go-between (1) coaxial laminating together, slider (41) stretch out holding tank (21) outer and with the terminal surface formation butt relation of closed ring (2).

4. The building power cord concealed wiring installation threading device of claim 3, wherein: the connecting structure further comprises a positioning strip, the positioning strip is installed on the pull rope (4), two ends of the positioning strip are fixedly connected with the two sliding blocks (41) of the pull rope (4) respectively, the positioning strip extends along the length direction of the pull rope (4), and the positioning strip is made of flexible materials.

5. The building power cord concealed cord installation threading device according to claim 1, characterized in that: the periphery side fixedly connected with joint piece (23) of closed ring (2), offer the draw-in groove that is used for with guide arm (3) joint on joint piece (23), the notch of draw-in groove is less than the external diameter of guide arm (3), joint piece (23) and guide arm (3) one-to-one.

6. The building power cord concealed wiring installation threading device of claim 5, wherein: the connecting ring (1) is supported by rubber, and the closed ring (2) is supported by rigid material.

7. The concealed power line installation threading device for the building, according to claim 1, is characterized in that: the guide rod is a telescopic rod and comprises an outer rod (31) and an inner rod (32), the inner rod (32) is in threaded connection with the outer rod (31), and the outer rod (31) is fixedly connected with the connecting ring (1).

8. The utility model provides a power cord hidden line installation threading installation method of building which characterized in that: the building power cord hidden cord installation and threading device according to any one of claims 1 to 7, wherein a steel cord (8) is simultaneously installed on two connecting rings (1), a closed ring (2) is installed on the connecting rings (1), the two connecting rings (1) are coaxially attached together by using a connecting structure, the steel cord (8) firstly passes through an installation pipe, one connecting ring (1) is detached from the steel cord (8) after the steel cord (8) passes through the installation pipe, the connecting rings (1) are installed on the electric cord (7), the closed ring (2) is installed on the connecting rings (1) again, the electric cord (7) and the steel cord (8) are connected with each other, and the connecting portion is located between the two connecting rings (1).