CN114792918B

CN114792918B - High-low voltage ring brush with stable contact

Info

Publication number: CN114792918B
Application number: CN202210356801.6A
Authority: CN
Inventors: 李长忠; 董帅; 程金营; 董其乙; 伊文浩
Original assignee: Huaneng Yimin Coal and Electricity Co Ltd
Current assignee: Huaneng Yimin Coal and Electricity Co Ltd
Priority date: 2022-03-31
Filing date: 2022-03-31
Publication date: 2023-05-23
Anticipated expiration: 2042-03-31
Also published as: LU503796B1; CN114792918A

Abstract

The invention discloses a brush for a high-low voltage ring, which comprises a fixing unit and a carbon brush, wherein the fixing unit comprises a fixed frame and an elastic component arranged on the fixed frame, the elastic component is arranged in a second installation area of the fixed frame and comprises a movable frame and an elastic piece arranged on the movable frame; the carbon brush is arranged in the first installation area of the fixing frame and comprises a conductor block and convex columns arranged on two sides of the conductor block; the fixing unit is an outer shell part of the electric brush, so that limit installation of the carbon brush can be guaranteed, continuous and stable pressure can be applied to the carbon brush along with abrasion of the carbon brush in a leverage manner through the arranged elastic component, and the electric brush has the characteristic of convenience in elastic force adjustment; and the limiting piece is arranged on the outer shell, so that the carbon brush is limited, and meanwhile, the downward extrusion force of the carbon brush is also provided, and the complete service cycle of the carbon brush is ensured, and the carbon brush has good contact effect with the slip ring all the time.

Description

High-low voltage ring brush with stable contact

Technical Field

The invention relates to the technical field of brushes of high-low voltage rings, in particular to a brush for a high-low voltage ring, which is stable in contact.

Background

The high-low voltage ring is an important electrical element on the electric shovel, and has the function of guiding the high-voltage power supply at the lower part of the electric shovel to the upper part of the electric shovel through the slip ring and the carbon brush, so that the lead is not wound when the electric shovel rotates. Meanwhile, the low-voltage control power supply and the walking power supply at the upper part are transmitted to the lower electric element and the motor through the conductive carbon brush and the slip ring, so that the walking of the electric shovel is realized.

However, with long-time use of the electric shovel, abrasion can be generated due to long-time friction of the sliding ring and the electric brush, so that the carbon brush is shortened, the existing pressure spring is made of soft steel sheets, pressure generated by long-time stress action of the soft steel sheets can be reduced, poor contact between the electric brush and the sliding ring is caused due to short-time and insufficient pressure of the electric brush, electrical faults are easily caused by virtual connection of the carbon brush and the sliding ring, arc short circuit is easily generated, the sliding ring is burnt out, and even fire is caused.

Disclosure of Invention

This section is intended to outline some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section as well as in the description summary and in the title of the application, to avoid obscuring the purpose of this section, the description summary and the title of the invention, which should not be used to limit the scope of the invention.

The present invention has been made in view of the above-described problems with brushes on conventional high and low voltage rings.

The invention aims to provide a brush for a high-low voltage ring, which is stable in contact, and aims to solve the problems of poor conduction caused by insufficient working pressure of a compression spring due to shortened abrasion of the carbon brush and spark and ring fire between the carbon brush and a slip ring.

In order to solve the technical problems, the invention provides the following technical scheme: the electric brush for the high-low voltage ring with stable contact comprises a fixing unit and a carbon brush, wherein the fixing unit comprises a fixing frame and an elastic component arranged on the fixing frame, the elastic component is arranged in a second installation area of the fixing frame and comprises a movable frame and an elastic piece arranged on the movable frame; the carbon brush is arranged in the first installation area of the fixing frame and comprises a conductor block and convex columns arranged on two sides of the conductor block.

As a preferable embodiment of the brush for high and low voltage rings of the present invention, the brush comprises: the fixing frame is also provided with a first installation area and a stress supporting area, and the first installation area and the second installation area are respectively arranged at two sides of the stress supporting area; the first installation area comprises a carbon brush placing groove, connecting ribs vertically arranged on the outer side of the carbon brush placing groove and limiting parts symmetrically arranged on two sides of the carbon brush placing groove.

As a preferable embodiment of the brush for high and low voltage rings of the present invention, the brush comprises: an opening groove is formed in the two side walls of the carbon brush placing groove along the vertical direction, and a notch of the opening groove is located at the top of the side wall of the carbon brush placing groove.

As a preferable embodiment of the brush for high and low voltage rings of the present invention, the brush comprises: the outer side walls of the two sides of the first installation area are also provided with limiting sliding grooves and connecting columns, the limiting sliding grooves and the connecting columns are symmetrically distributed on the two sides of the open slot, and the connecting columns are positioned on one side, far away from the open slot, of the limiting sliding grooves; the length of the groove cavity of the limiting chute is smaller than that of the opening groove.

As a preferable embodiment of the brush for high and low voltage rings of the present invention, the brush comprises: the limiting piece comprises elastic telescopic rods which are symmetrically arranged, wherein each elastic telescopic rod comprises an outer connecting pipe, a spring, an extension rod and an arc-shaped plate, one end of each outer connecting pipe is connected to the connecting column, the spring is arranged in the inner cavity of the outer connecting pipe, one end of each extension rod is arranged in the outer connecting pipe in a sliding mode, and the arc-shaped plate is arranged at the free end of each extension rod; the outer side wall of the free end of the extension rod is also provided with a limit lug, and the limit lug can slide in the limit chute in a matched manner.

As a preferable embodiment of the brush for high and low voltage rings of the present invention, the brush comprises: the stress supporting area comprises a supporting tower, and two side walls of the supporting tower are provided with opening limiting grooves; the notch of the opening limiting groove is perpendicular to the vertical direction of the supporting tower, and the opening height of the opening limiting groove is larger than the height of the conductor block.

As a preferable embodiment of the brush for high and low voltage rings of the present invention, the brush comprises: the second installation area comprises a connecting table arranged on the side wall of the top of the fixing frame, a second open slot arranged on the connecting table, and limit slots arranged on the side walls of the two sides of the fixing frame.

As a preferable embodiment of the brush for high and low voltage rings of the present invention, the brush comprises: the elastic component still include the atress board with set up in the press head of atress board one end, the atress board be close to set up the rotation post on the both sides wall of press head, the rotation post can the cooperation install in the opening spacing inslot.

As a preferable embodiment of the brush for high and low voltage rings of the present invention, the brush comprises: the movable frame comprises a movable plate, connecting arms symmetrically arranged on the side walls of the end parts of the movable plate, and limiting columns arranged on the adjacent side walls of the two connecting arms; threaded holes are formed in the side walls of the movable plates; the limit post can slide in the limit groove in a matched mode.

As a preferable embodiment of the brush for high and low voltage rings of the present invention, the brush comprises: the elastic piece comprises a screw rod, a mounting plate arranged at the free end of the screw rod and a spring with one end mounted on the mounting plate; the screw rod can be matched and rotated in the threaded hole and can be accommodated in the second open groove; the spring is far away from the one end of mounting panel has the couple, the couple can articulate in the atress board is far away from the one end of pressing head.

The invention has the beneficial effects that:

the fixing unit is an outer shell part of the electric brush, so that limit installation of the carbon brush can be guaranteed, continuous and stable pressure can be applied to the carbon brush along with abrasion of the carbon brush in a leverage manner through the arranged elastic component, and the electric brush has the characteristic of convenience in elastic force adjustment; and the limiting piece is arranged on the outer shell, so that the carbon brush is limited, and meanwhile, the downward extrusion force of the carbon brush is also provided, and the complete service cycle of the carbon brush is ensured, and the carbon brush has good contact effect with the slip ring all the time.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. Wherein:

fig. 1 is a schematic view showing the overall structure of the brush for high and low voltage rings of the present invention.

Fig. 2 is a schematic diagram showing the overall structure of the holder of the brush for high-low voltage ring, which is stable in contact.

Fig. 3 is a schematic view of the external structure of the holder of the brush for high and low voltage rings, which is stable in contact.

Fig. 4 is a schematic diagram showing an overall side view and a partially enlarged structure of the brush for high and low voltage rings of the present invention.

Fig. 5 is a schematic view showing an enlarged partial K structure of the brush for high and low voltage rings of the present invention.

Fig. 6 is a schematic view of the overall explosion structure of the brush for high and low voltage rings of the present invention with stable contact.

Fig. 7 is a schematic view showing the entire semi-sectional plane structure of the brush for high and low voltage rings of the present invention.

Detailed Description

In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present invention is not limited to the specific embodiments disclosed below.

Further, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic can be included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.

Further, in describing the embodiments of the present invention in detail, the cross-sectional view of the device structure is not partially enlarged to a general scale for convenience of description, and the schematic is only an example, which should not limit the scope of protection of the present invention. In addition, the three-dimensional dimensions of length, width and depth should be included in actual fabrication.

Example 1

Referring to fig. 1, for the first embodiment of the present invention, there is provided a brush for high and low voltage rings with stable contact, the brush including a fixing unit 100 and a carbon brush 200, wherein the fixing unit 100 is used for limiting installation of the carbon brush 200 and applying downward continuous pressure to the carbon brush 200 thereof, so as to ensure that the lower end of the carbon brush 200 can be continuously and stably contacted with a slip ring, thereby keeping a high voltage power supply at the lower part of an electric shovel to be continuously led to the upper part of the electric shovel.

Specifically, the fixing unit 100 includes a fixing frame 101 and an elastic component 102 disposed on the fixing frame 101, where the elastic component 102 is disposed in a second installation area 101c of the fixing frame 101, and includes a movable frame 102a and an elastic member 102b disposed on the movable frame 102 a; the fixing frame 101 is an integrated outer shell structure, and is divided into three sections for convenience of description, wherein the first section is a first installation area 101a, the middle section is a stress supporting area 101b, and the third section is a second installation area 101c; the carbon brush 200 is installed in the first installation area 101a, the elastic component 102 is installed in the second installation area 101c, and a lever structure is formed by the stress supporting area 101b and the carbon brush 200 in the first installation area 101a, so as to apply continuous and stable downward pressure to the installed carbon brush 200.

The carbon brush 200 is disposed in the first mounting region 101a of the fixing frame 101, and includes a conductor block 201 and protruding columns 202 disposed on two sides of the conductor block 201. The carbon brush 200 has the same function as the conventional existing carbon brush, and contacts with the slip ring through the lower end; but there is a difference in structure that the two side walls of the electric conductor 201 are additionally provided with the protruding columns 202 perpendicular to the side walls of the electric conductor 201, so as to cooperate with the limiting piece 101a-3 to realize pressurization and limiting.

Example 2

Referring to fig. 1, a second embodiment of the present invention is shown, which is different from the first embodiment in that: the fixing frame 101 further has a first mounting region 101a and a stress supporting region 101b, and the first mounting region 101a and the second mounting region 101c are disposed on both sides of the stress supporting region 101 b.

The first installation area 101a includes a carbon brush placing groove 101a-1, connecting ribs 101a-2 vertically arranged outside the carbon brush placing groove 101a-1, and limiting members 101a-3 symmetrically arranged at two sides of the carbon brush placing groove 101 a-1.

Open grooves 101a-11 are formed in the two side walls of the carbon brush placing groove 101a-1 in the vertical direction, and the notch of the open groove 101a-11 is positioned at the top of the side wall of the carbon brush placing groove 101 a-1.

The outer side walls of the two sides of the first installation area 101a are also provided with limiting sliding grooves 101a-12 and connecting columns 101a-13, the limiting sliding grooves 101a-12 and the connecting columns 101a-13 are symmetrically distributed on the two sides of the open slot 101a-11, and the connecting columns 101a-13 are positioned on one side, far away from the open slot 101a-11, of the limiting sliding grooves 101 a-12; the slot cavity length of the limit chute 101a-12 is less than the slot cavity length of the open slot 101 a-11.

The limiting piece 101a-3 comprises an elastic telescopic rod T which is symmetrically arranged, wherein the elastic telescopic rod T comprises an external connecting tube T1, a spring T2, an extension rod T3 and an arc-shaped plate T4, one end of the external connecting tube T1 is connected to the connecting column 101a-13, the spring T2 is arranged in the inner cavity of the external connecting tube T1, one end of the extension rod T3 is arranged in the cavity of the external connecting tube T1 in a sliding manner, and the arc-shaped plate T4 is arranged at the free end of the extension rod T3; the outer side wall of the free end of the extension rod T3 is also provided with a limit lug T5, and the limit lug T5 can slide in the limit sliding grooves 101a-12 in a matched mode.

The stress supporting area 101b comprises a supporting tower 101b-1, and two side walls of the supporting tower 101b-1 are provided with opening limiting grooves 101b-2; the notch of the opening limiting groove 101b-2 is perpendicular to the vertical direction of the supporting tower 101b-1, and the opening height of the opening limiting groove 101b-2 is larger than the height of the conductor block 201.

The second installation area 101c comprises a connecting table 101c-1 arranged on the side wall of the top of the fixing frame 101, a second open slot 101c-2 arranged on the connecting table 101c-1, and limit slots 101c-3 arranged on the side walls of the two sides of the fixing frame 101.

Further, compared to embodiment 1, the main body portion of the first mounting region 101a is a carbon brush placement groove 101a-1 for placing the carbon brush 200, which is vertically through and matches the shape of the carbon brush 200. The connecting ribs 101a-2 are located on the end side wall of the first mounting area 101a for fixing the entire housing to a fixing frame outside the slip ring. The stoppers 101a-3 on both sides are used for mounting the carbon brush 200 and pressurizing after mounting.

Further, the open grooves 101a-11 are formed on the two side walls of the carbon brush placement 101a-1, and the notches are upward, so that the convex columns 202 on the two sides of the electric conductor 201 can be conveniently placed in the open grooves; the open grooves 101a-11 are elongated, and the bottom of the groove length is the maximum abrasion depth of the carbon brush 200.

Furthermore, the limiting member 101a-3 may be a device with elastic expansion capability, and in the embodiment, a form of an elastic expansion rod T is adopted, specifically, a spring T2 is installed in the outer tube T1, one end of the extending rod T3 extends into a cavity of the outer tube T1 and presses an end of the spring T2, the other end of the extending rod T3 is fixed with an arc plate T4, and the side wall of the end is further provided with a limiting bump T5, the limiting bump T5 can slide in the limiting chute 101a-12 in a matching manner, one end of the outer tube T1 is connected to the connecting post 101a-13, and under the condition of two-point limiting, the total length of the outer tube T1 and the extending rod T3 can be changed. It should be noted that, the shortest length of the elastic telescopic rod T is the vertical distance from the connecting post 101a-13 to the open slot 101a-11, and the distance from the connecting post 101a-13 to the top of the limit chute 101a-12 is smaller than the distance from the connecting post 101a-13 to the bottom of the limit chute 101 a-12. It should be further noted that, the radian of the arc plate T4 is less than 180 degrees, and when the two groups of elastic telescopic rods T are at the highest point at the same time, the upper end side wall distance of the two arc plates T4 is farthest, not less than the maximum diameter of the convex pillar 202, and when at the lowest point, the upper end side wall edges of the two arc plates T4 can just contact.

The limiting sliding groove 101a-12 and the connecting column 101a-13 are symmetrically distributed on two sides of the open groove 101a-11, the connecting column 101a-13 is far away from the open groove 101a-11, the limiting sliding groove 101a-12 is used for limiting the whole telescopic length of the limiting piece 101a-3, and the connecting column 101a-13 is used for installing the limiting piece 101a-3.

The main body of the stress supporting region 101b is a supporting tower 101b-1, the height of the stress supporting region is larger than that of the carbon brush 200, a groove cavity is formed in the upper end of the supporting tower 101b-1, the stress plate 102a in the elastic component 102 can be placed and limited conveniently, an opening limiting groove 101b-2 is formed in the side wall of the upper end of the supporting tower 101b-1, the notch is perpendicular to the height direction of the supporting tower 101b-1 and faces the second mounting region 101c, and the purpose of the stress plate 102a can be placed conveniently. The opening height of the opening limit groove 101b-2 is larger than the height of the conductor block 201, so that the middle end of the stress plate 102a is limited in the opening limit groove 101b-2, and the two ends take the opening limit groove as a fulcrum to form a lever structure.

The second mounting region 101c mounts the elastic assembly 102 by providing a connection stage 101c-1 at a top sidewall of the fixing frame 101 to achieve a forward pressure of the other end by applying a reverse elastic force to one end of the force receiving plate 102 a.

The rest of the structure is the same as that of embodiment 1.

Example 3

Referring to fig. 1, a third embodiment of the present invention is shown, which differs from the second embodiment in that: the elastic component 102 further comprises a force-bearing plate 102c and a pressing head 102d arranged at one end of the force-bearing plate 102c, wherein rotating columns 102c-1 are arranged on two side walls, close to the pressing head 102d, of the force-bearing plate 102c, and the rotating columns 102c-1 can be matched and arranged in the opening limiting groove 101 b-2.

The movable frame 102a comprises a movable plate 102a-1, connecting arms 102a-2 symmetrically arranged on the side walls of the end parts of the movable plate 102a-1, and limiting columns 102a-3 arranged on the adjacent side walls of the two connecting arms 102 a-2; a threaded hole L is formed in the side wall of the movable plate 102 a-1; the stopper posts 102a-3 can slide in the stopper grooves 101c-3 in a mating manner.

The elastic member 102b includes a screw 102b-1, a mounting plate 102b-2 provided at a free end of the screw 102b-1, and a spring 102b-3 having one end mounted on the mounting plate 102 b-2; the screw 102b-1 can be matched and rotated in the threaded hole L and can be accommodated in the second open groove 101 c-2; the end of the spring 102b-3 remote from the mounting plate 102b-2 has a hook G that can be hooked to the end of the force plate 102a remote from the pressing head 102 b.

Further, compared to embodiment 2, the pressing head 102d and the elastic member 102b of the elastic assembly 102 are disposed at two ends of the force-bearing plate 102c, the pressing head 102d is used for increasing the pressing area of the carbon brush 200, and the elastic member 102b is mounted at the end of the second mounting region 101c through the movable frame 102 a. Further, the width of the movable plate 102a-1 in the movable frame 102a is larger than the width of the second installation area 101c in the fixed frame 101, and connecting plates are provided at both ends of the movable plate as connecting arms 102a-2, one end of the connecting arm 102a-2, which is far away from the movable plate 102a-1, is movably connected in limiting grooves 101c-3 formed on both side walls of the second installation area 101c through limiting posts 102a-3 installed, and the connection relation is convenient for adjusting the position of the movable frame 102a, i.e. the movable plate 102a-1 can be vertically placed on the top side wall of the second installation area 101c, or the movable plate 102a-1 can be biased to one side of the second installation area 101c to provide a stretching state, or an initial state, for the springs 102b-3 in the elastic member 102 b.

It should be noted that, the distance from the elastic member 102b to the support tower 101b-1 is greater than the distance from the pressing head 102d to the support tower 101b-1, i.e. the force distance on the force-receiving plate 102c on the side of the spring 102b-3 is greater than the force distance on the force-receiving plate 102c on the side of the pressing head 102 d.

The rest of the structure is the same as that of embodiment 2.

Referring to fig. 1 to 7, in an initial state, the symmetrical elastic telescopic rods T are positioned at the top of the limit sliding groove 101a-12 at one end of the arc plate T4, the electric conductor 201 is placed from the notch of the carbon brush placing groove 101a-1, the convex columns 202 at two sides of the electric conductor are kept to be corresponding to the opening groove 101a-11, when the convex columns 202 contact the two arc plates T4, the elastic telescopic rods T are pushed to deflect, the spring T2 is compressed due to the fact that the limit convex blocks T5 slide in the limit sliding groove 101a-12, the whole length of the elastic telescopic rods T is shortened, and the convex columns 202 continuously slide towards the bottom of the opening groove 101a-11 until the bottom of the placed carbon brush 200 is stopped when contacting the surface of the slip ring; then, the rotating column 102c-1 on the middle side wall of the force-bearing plate 102c is placed in the opening limiting groove 101b-2, so that the pressing head 102d contacts with the top of the carbon brush 200, and the other end of the force-bearing plate 102c is connected with the hook G on the lower end of the spring 102b-3 in a hanging mode. The movable frame 102a is shifted, so that the movable frame 102a rotates around the limiting column 102a-3 and finally falls on the top side wall of the second installation area 101c of the fixed frame 101, the spring 102b-3 is elongated, and downward pressure is applied to the carbon brush 200 through the stress plate 102c and the pressing head 102 d. And the spring force of the spring 102b-3 can be adjusted by changing the installation height of the spring 102b-3 by rotating the screw 102 b-1.

As the carbon brush 200 wears during use, the height of the conductive body 201 is shortened, and first, the symmetrically arranged elastic telescopic rods T are stretched, and downward pressure is applied to the conductive body 201 by pushing the protruding columns 202 to slide toward the bottoms of the open grooves 101 a-11; meanwhile, due to the leverage of the force-receiving plate 102c, the height of the electric conductor 201 is shortened, and in order to maintain the balance of the lever, the spring 102b-3 is shortened to change the elastic force, thereby maintaining the balance of the lever. A non-linear pressure is applied to the carbon brush 200 by the two sets of pressures. The condition that pressure is insufficient to the carbon brush by the pressure spring in the existing electric brush is solved.

It should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention may be modified or substituted without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered in the scope of the claims of the present invention.

Claims

1. The utility model provides a high low pressure ring brush that contacts steadily which characterized in that: comprising the steps of (a) a step of,

the fixing unit (100) comprises a fixing frame (101) and an elastic component (102) arranged on the fixing frame (101), wherein the elastic component (102) is arranged in a second installation area (101 c) of the fixing frame (101) and comprises a movable frame (102 a) and an elastic piece (102 b) arranged on the movable frame (102 a);

the carbon brush (200) is arranged in a first installation area (101 a) of the fixing frame (101) and comprises a conductor block (201) and convex columns (202) arranged on two sides of the conductor block (201);

the fixing frame (101) is further provided with a first installation area (101 a) and a stress supporting area (101 b), and the first installation area (101 a) and the second installation area (101 c) are respectively arranged on two sides of the stress supporting area (101 b);

the first installation area (101 a) comprises a carbon brush placing groove (101 a-1), connecting ribs (101 a-2) vertically arranged on the outer side of the carbon brush placing groove (101 a-1) and limiting pieces (101 a-3) symmetrically arranged on two sides of the carbon brush placing groove (101 a-1);

open grooves (101 a-11) are formed in the two side walls of the carbon brush placing groove (101 a-1) along the vertical direction, and the notch of the open groove (101 a-11) is positioned at the top of the side wall of the carbon brush placing groove (101 a-1);

the two outer side walls of the first installation area (101 a) are also provided with limiting sliding grooves (101 a-12) and connecting columns (101 a-13), the limiting sliding grooves (101 a-12) and the connecting columns (101 a-13) are symmetrically distributed on two sides of the open grooves (101 a-11), and the connecting columns (101 a-13) are located on one side, far away from the open grooves (101 a-11), of the limiting sliding grooves (101 a-12);

the length of the groove cavity of the limiting sliding groove (101 a-12) is smaller than that of the opening groove (101 a-11);

the limiting piece (101 a-3) comprises elastic telescopic rods (T) which are symmetrically arranged, wherein each elastic telescopic rod (T) comprises an external connection tube (T1) with one end connected to the connecting column (101 a-13), a spring (T2) arranged in the inner cavity of the external connection tube (T1), an extension rod (T3) with one end slidably arranged in the inner cavity of the external connection tube (T1), and an arc-shaped plate (T4) arranged at the free end of the extension rod (T3);

the outer side wall of the free end of the extension rod (T3) is also provided with a limit lug (T5), and the limit lug (T5) can slide in the limit sliding groove (101 a-12) in a matching way;

the stress supporting area (101 b) comprises a supporting tower (101 b-1), and two side walls of the supporting tower (101 b-1) are provided with opening limiting grooves (101 b-2);

the notch of the opening limiting groove (101 b-2) is perpendicular to the vertical direction of the supporting tower (101 b-1), and the opening height of the opening limiting groove (101 b-2) is larger than the height of the conductor block (201);

the second installation area (101 c) comprises a connecting table (101 c-1) arranged on the side wall of the top of the fixed frame (101), a second open slot (101 c-2) arranged on the connecting table (101 c-1), and limit slots (101 c-3) arranged on the side walls of the two sides of the fixed frame (101);

the elastic assembly (102) further comprises a stress plate (102 c) and a pressing head (102 d) arranged at one end of the stress plate (102 c), wherein rotating columns (102 c-1) are arranged on two side walls, close to the pressing head (102 d), of the stress plate (102 c), and the rotating columns (102 c-1) can be matched and arranged in the opening limiting grooves (101 b-2);

the movable frame (102 a) comprises a movable plate (102 a-1), connecting arms (102 a-2) symmetrically arranged on the side walls of the end parts of the movable plate (102 a-1), and limiting columns (102 a-3) arranged on the adjacent side walls of the two connecting arms (102 a-2);

a threaded hole (L) is formed in the side wall of the movable plate (102 a-1);

the limiting column (102 a-3) can slide in the limiting groove (101 c-3) in a matched mode;

the elastic piece (102 b) comprises a screw rod (102 b-1), a mounting plate (102 b-2) arranged at the free end of the screw rod (102 b-1), and a spring (102 b-3) with one end mounted on the mounting plate (102 b-2);

the screw (102 b-1) can be matched and rotated in the threaded hole (L) and can be accommodated in the second open groove (101 c-2);

one end of the spring (102 b-3) far away from the mounting plate (102 b-2) is provided with a hook (G), and the hook (G) can be hung on one end of the stress plate (102 c) far away from the pressing head (102 d).