A knife contact device for a high-voltage disconnect switch

Abstract

This invention relates to the technical field of power equipment, and in particular to a knife contact device for a high-voltage disconnector switch. The device includes a knife contact mechanism comprising an isolation component, a knife contact component and a contact assembly located on the isolation component; and a drive mechanism comprising a connecting component connected to the knife contact component and a drive component connected to the connecting component. The knife contact component and the contact assembly are interconnected, and the drive component is mounted on the isolation component. By rotating the drive component, the invention moves the connecting component, causing the knife contact component to flip and contact the contact assembly, thereby achieving the closing function. Simultaneously, the contact assembly provides abutment against the knife contact component, preventing easy separation of the two components. This also improves the contact effect between the two components and prevents jamming during separation.

Description

Technical Field

[0001] This invention relates to the technical field of electrical equipment, and more particularly to a knife contact device for a high-voltage disconnect switch. Background Technology

[0002] A high-voltage disconnect switch, also known as a high-voltage knife switch, is a device used to isolate and disconnect circuits in high-voltage power systems. It plays a crucial role in maintenance, repair, emergencies, or when circuit isolation is required. These switches are commonly used in high-voltage power facilities such as substations, transmission lines, and power plants.

[0003] The existing high-voltage disconnect switches have a relatively simple knife-edge structure, mostly consisting of a single copper sheet in contact with each other. After closing, the knife-edge may experience poor contact, and it is also prone to jamming, making it difficult to open. Summary of the Invention

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0005] In view of the problems existing in the knife contact device for high-voltage disconnect switches, the present invention is proposed.

[0006] Therefore, the purpose of this invention is to provide a knife contact device for a high-voltage disconnect switch.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a knife contact device for a high-voltage disconnecting switch, comprising: a knife contact mechanism including an isolation component, a knife contact component and a contact component located on the isolation component; and a drive mechanism including a connecting component connected to the knife contact component and a drive component connected to the connecting component; wherein the knife contact component and the contact component can be connected to each other, and the drive component is mounted on the isolation component.

[0008] As a preferred embodiment of the high-voltage disconnecting switch knife contact device of the present invention, the isolation component includes an isolation steel plate, a first insulator is provided on one side of the upper end of the isolation steel plate, a second insulator is provided on the other side of the upper end of the isolation steel plate, and a set of U-shaped steel plates is also provided at the bottom of the isolation steel plate.

[0009] As a preferred embodiment of the high-voltage disconnect switch knife contact device of the present invention, the knife contact assembly includes a first conductive copper connector, a U-shaped copper sheet is fixedly connected to the upper side of the first conductive copper connector, a knife contact body is rotatably connected to the middle of the U-shaped copper sheet, and a positioning shaft hole is also provided on the knife contact body.

[0010] The contact assembly includes a second conductive copper connector, on which a third conductive copper connector is rotatably connected; the first conductive copper connector is fixedly installed on the first insulator, and the second conductive copper connector is fixedly installed on the second insulator.

[0011] In a preferred embodiment of the high-voltage disconnector switch knife contact device of the present invention: the second conductive copper connector includes a second conductive copper connector body, one end of which is provided with a supporting round rod; the third conductive copper connector includes a third conductive copper connector body, one side of which is provided with a supporting ring sleeve, and another side of which is provided with a spring located below the supporting ring sleeve; the third conductive copper connector body is rotatably connected around the supporting round rod via the supporting ring sleeve.

[0012] As a preferred embodiment of the high-voltage disconnecting switch knife contact device of the present invention, an L-shaped bracket is further provided on one side of the supporting round rod on the body of the second conductive copper connector, and the L-shaped bracket can restrict the rotation of the supporting ring.

[0013] As a preferred embodiment of the high-voltage disconnecting switch knife contact device of the present invention, wherein: one end of the third conductive copper connector body is provided with an arc-shaped guide head, and the other end of the third conductive copper connector body is provided with a short support frame; the short support frame can contact the knife contact body.

[0014] In a preferred embodiment of the high-voltage disconnecting switch knife contact device of the present invention, the second conductive copper connector body is further provided with a limiting groove; a connecting rod is provided on one side of the third conductive copper connector body located below the spring, and a counterweight is provided at the end of the connecting rod; the connecting rod passes through the limiting groove, and when the third conductive copper connector body is connected by rotating around the supporting round rod through the supporting ring, the connecting rod moves within the limiting groove to play a limiting role.

[0015] In a preferred embodiment of the high-voltage disconnector switch knife contact device of the present invention, the connecting assembly includes a third insulator, one end of which is provided with a T-shaped shaft, and the other end of which is provided with an insulator rotatable connection end; the T-shaped shaft is rotatably connected to a positioning shaft hole, and the insulator rotatable connection end is rotatably connected to a drive assembly.

[0016] In a preferred embodiment of the high-voltage disconnector knife contact device of the present invention, the driving assembly includes a driven rod, and the driven rod is provided with an extension bracket; the insulator rotating connection end is rotatably connected to the extension bracket.

[0017] As a preferred embodiment of the high-voltage disconnector knife contact device of the present invention, wherein: a locking disc is provided on one side of the driven rod, and a driving rod is also provided on the locking disc; a supporting iron plate is also provided on the isolation steel plate, and the driven rod is rotatably connected to the supporting iron plate.

[0018] The beneficial effects of the present invention are as follows: by rotating the drive component, the connecting component can be moved, and the movement of the connecting component causes the blade component to flip and contact the contact component, thereby achieving the closing function. At the same time, the contact component can abut against the blade component to prevent the contact component and the blade component from easily separating. The contact component and the blade component can have a better contact effect, and the jamming situation when the contact component and the blade component are separated is avoided. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0020] Figure 1 This is a schematic diagram of the overall structure of the knife contact device for the high-voltage disconnect switch of the present invention.

[0021] Figure 2 This is an exploded structural diagram of the knife contact device for the high-voltage disconnect switch of the present invention.

[0022] Figure 3 This is a schematic diagram of the knife contact mechanism of the high-voltage disconnector switch of the present invention.

[0023] Figure 4 This is a schematic diagram of the isolation component structure of the knife contact device for the high-voltage disconnect switch of the present invention.

[0024] Figure 5 This is a schematic diagram of the contact assembly structure of the knife contact device for the high-voltage disconnect switch of the present invention.

[0025] Figure 6 This is a schematic diagram of the contact assembly structure of the knife contact device for the high-voltage disconnect switch of the present invention.

[0026] Figure 7This is a schematic diagram of the second conductive copper connector structure of the high-voltage disconnector switch knife contact device of the present invention.

[0027] Figure 8 This is a schematic diagram of the third conductive copper connector structure of the high-voltage disconnector switch knife contact device of the present invention.

[0028] Figure 9 This is a schematic diagram of the drive mechanism structure of the knife contact device for the high-voltage disconnect switch of the present invention. Detailed Implementation

[0029] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0030] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0031] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0032] Secondly, the present invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include three-dimensional spatial dimensions of length, width, and depth.

[0033] Example 1

[0034] Reference Figure 1-8 A schematic diagram of the overall structure of a knife contact device for a high-voltage disconnector is provided, as shown below. Figure 1 A high-voltage disconnector switch knife contact device includes a knife contact mechanism 100, comprising an isolation component 101, a knife contact component 102 and a contact component 103 located on the isolation component 101; and a drive mechanism 200, comprising a connection component 201 connected to the knife contact component 102 and a drive component 202 connected to the connection component 201; wherein the knife contact component 102 and the contact component 103 can be connected to each other, and the drive component 202 is mounted on the isolation component 101;

[0035] The rotating drive component 202 can drive the connecting component 201 to move. The movement of the connecting component 201 causes the contact blade component 102 to flip and contact the contact assembly 103, thereby achieving the closing function. At the same time, the contact assembly 103 can abut against the contact blade component 102 to prevent the contact assembly 103 and the contact blade component 102 from easily separating. The contact assembly 103 and the contact blade component 102 can have a better contact effect, and the jamming situation when the contact assembly 103 and the contact blade component 102 are prevented.

[0036] Specifically, the isolation assembly 101 includes an isolation steel plate 101a, a first insulator 101b is provided on one side of the upper end of the isolation steel plate 101a, a second insulator 101c is provided on the other side of the upper end of the isolation steel plate 101a, and a set of U-shaped steel plates 101d is also provided at the bottom of the isolation steel plate 101a.

[0037] The first insulator 101b and the second insulator 101c both serve as insulation and isolation devices. A set of U-shaped steel plates 101d and isolation steel plates 101a facilitates installation and fixing by workers.

[0038] Specifically, the contact assembly 102 includes a first conductive copper connector 102a, a U-shaped copper sheet 102b fixedly connected to the upper side of the first conductive copper connector 102a, a contact body 102c rotatably connected to the middle of the U-shaped copper sheet 102b, and a positioning shaft hole 102d opened on the contact body 102c; the contact assembly 103 includes a second conductive copper connector 103a, a third conductive copper connector 103b rotatably connected to the second conductive copper connector 103a; the first conductive copper connector 102a is fixedly installed on the first insulator 101b, and the second conductive copper connector 103a is fixedly installed on the second insulator 101c;

[0039] The U-shaped copper sheet 102b is fixed to the upper side of the first conductive copper connector 102a, so that the contact body 102c can be installed on the U-shaped copper sheet 102b and rotate around it. The third conductive copper connector 103b is rotatably connected to the upper side of the second conductive copper connector 103a, so that the contact body 102c can be limited and locked onto the second conductive copper connector 103a after contacting the third conductive copper connector 103b. The first conductive copper connector 102a is fixedly installed on the first insulator 101b after passing through a screw, and the second conductive copper connector 103a is fixedly installed on the second insulator 101c after passing through a screw.

[0040] Specifically, the second conductive copper connector 103a includes a second conductive copper connector body 103a-1, and a supporting round rod 103a-2 is provided at one end of the second conductive copper connector body 103a-1; the third conductive copper connector 103b includes a third conductive copper connector body 103b-1, a supporting ring sleeve 103b-2 is provided on one side of the third conductive copper connector body 103b-1, and a spring 103b-3 is also provided on one side of the third conductive copper connector body 103b-1 located below the supporting ring sleeve 103b-2; the third conductive copper connector body 103b-1 is rotatably connected around the supporting round rod 103a-2 through the supporting ring sleeve 103b-2.

[0041] The second conductive copper connector body 103a-1 is fixedly installed on the second insulator 101c after being passed through by a screw. The third conductive copper connector body 103b-1 rotates around the support rod 103a-2 through the support ring 103b-2. The spring 103b-3 is located between the second conductive copper connector body 103a-1 and the third conductive copper connector body 103b-1.

[0042] Specifically, an L-shaped bracket 103a-3 is also provided on one side of the supporting round rod 103a-2 on the second conductive copper connector body 103a-1. The L-shaped bracket 103a-3 can restrict the rotation of the supporting ring 103b-2.

[0043] The L-shaped bracket 103a-3 is installed on one side of the second conductive copper connector body 103a-1. When the support ring 103b-2 rotates around the support rod 103a-2, it can be limited by the L-shaped bracket 103a-3, thereby preventing the third conductive copper connector body 103b-1 from squeezing the second conductive copper connector body 103a-1 and limiting the compression of the spring 103b-3 to a certain range.

[0044] Operation process: When the contact blade body 102c is engaged with the third conductive copper connector body 103b-1, the third conductive copper connector body 103b-1 rotates around the support rod 103a-2 via the support ring 103b-2. The spring 103b-3 is compressed on the second conductive copper connector body 103a-1. When the support ring 103b-2 flips onto the L-shaped bracket 103a-3, it can be limited, thereby preventing damage to the spring 103b-3. At the same time, under the action of the spring 103b-3, the contact blade body 102c and the third conductive copper connector body 103b-1 can make full contact. Meanwhile, the third conductive copper connector body 103b-1 and the second conductive copper connector body 103a-1 are connected to achieve conductivity.

[0045] Example 2

[0046] Reference Figure 1-8The difference between this embodiment and the first embodiment is that: one end of the third conductive copper connector body 103b-1 is provided with an arc-shaped guide head 103b-4, and the other end of the third conductive copper connector body 103b-1 is provided with a short support frame 103b-5; the short support frame 103b-5 can contact the contact blade body 102c.

[0047] The arc-shaped inlet head 103b-4 facilitates the insertion of the contact body 102c, while the short support frame 103b-5 supports the contact body 102c, thereby preventing the contact body 102c from getting stuck on the third conductive copper connector body 103b-1 for too long, which would make it difficult to separate the contact body 102c and the third conductive copper connector body 103b-1.

[0048] Specifically, the second conductive copper connector body 103a-1 is also provided with a limiting groove 103a-4; a connecting rod 103b-6 is also provided on one side of the third conductive copper connector body 103b-1 below the spring 103b-3, and a counterweight 103b-7 is provided at the end of the connecting rod 103b-6; the connecting rod 103b-6 passes through the limiting groove 103a-4, and when the third conductive copper connector body 103b-1 is connected by rotating around the supporting round rod 103a-2 through the support ring 103b-2, the connecting rod 103b-6 moves in the limiting groove 103a-4 to play a limiting role;

[0049] When spring 103b-3 is damaged, after the contact knife body 102c and the third conductive copper connector body 103b-1 separate, the connecting rod 103b-6 can move within the limiting groove 103a-4, thus facilitating the rotation of the third conductive copper connector body 103b-1 around the supporting rod 103a-2 via the supporting ring 103b-2. Simultaneously, the connecting rod 103b-6 is confined within the limiting groove 103a-4, preventing the third conductive copper connector body from moving. When 103b-1 is over-rotated, and the counterweight 103b-7 is located at the end of the connecting rod 103b-6, the third conductive copper connector body 103b-1 remains tilted, which facilitates the introduction of the contact body 102c. When the spring 103b-3 loses its function, the connecting rod 103b-6, under the action of the counterweight 103b-7, drives the third conductive copper connector body 103b-1 to contact the contact body 102c, thereby achieving the function of closing the circuit.

[0050] The rest of the structure is the same as in Example 1.

[0051] Operation process: The arc-shaped guide head 103b-4 facilitates the insertion of the contact body 102c. The short support frame 103b-5 supports the contact body 102c. After the contact body 102c is inserted, the spring 103b-3 is compressed on the second conductive copper connector body 103a-1, thus keeping the third conductive copper connector body 103b-1 and the contact body 102c in a contacting state. If the spring 103b-3 is damaged, the counterweight 103b-7 can keep the third conductive copper connector body 103b-1 in an inclined state, thus facilitating the insertion of the contact body 102c. After closing, under the action of the counterweight 103b-7, the connecting rod 103b-6 drives the third conductive copper connector body 103b-1 to contact the contact body 102c, thus keeping the third conductive copper connector body 103b-1 and the contact body 102c in a contacting state.

[0052] Example 3

[0053] Reference Figure 1-9 This embodiment differs from the previous embodiments in that: the connecting component 201 includes a third insulator 201a, one end of the third insulator 201a is provided with a T-shaped shaft 201b, and the other end of the third insulator 201a is provided with an insulator rotating connection end 201c; the T-shaped shaft 201b is rotatably connected to the positioning shaft hole 102d, and the insulator rotating connection end 201c is rotatably connected to the driving component 202;

[0054] Among them, the third insulator 201a plays the role of insulation and isolation, the T-shaped shaft 201b is rotatably connected to the positioning shaft hole 102d, thereby driving the contact knife body 102c to rotate, and the insulator rotating connection end 201c is rotatably connected to the drive assembly 202, so that the drive assembly 202 can drive the insulator rotating connection end 201c to rotate around the drive assembly 202.

[0055] Specifically, the drive assembly 202 includes a driven rod 202a, on which an extension bracket 202b is provided; the insulator rotatable connection end 201c is rotatably connected to the extension bracket 202b;

[0056] The extension bracket 202b is fixed to the driven rod 202a, so that the rotation of the driven rod 202a can drive the extension bracket 202b to rotate. The insulator rotating connection end 201c is rotatably connected to the extension bracket 202b, so that the rotation of the extension bracket 202b can drive the rotation of the insulator rotating connection end 201c to rotate.

[0057] Specifically, a locking disc 202c is provided on one side of the driven rod 202a, and a drive rod 202d is also provided on the locking disc 202c; a supporting iron plate 202e is also provided on the isolation steel plate 101a, and the driven rod 202a is rotatably connected to the supporting iron plate 202e.

[0058] Among them, the locking disc 202c is fixed to one side of the driven rod 202a, the driving rod 202d is fixed to the locking disc 202c, and the driving rod 202d rotates to make the locking disc 202c rotate. The rotation of the locking disc 202c drives the driven rod 202a to rotate. The supporting iron plate 202e plays a supporting role in the rotation of the driven rod 202a. The supporting iron plate 202e is fixed to the isolation steel plate 101a.

[0059] The rest of the structure is the same as in Example 2.

[0060] Operation process: By rotating the drive rod 202d, the locking disc 202c drives the driven rod 202a to rotate. The rotation of the driven rod 202a drives the extension bracket 202b to rotate. The rotation of the extension bracket 202b drives the insulator rotating connection end 201c to rotate around the driven rod 202a. At the same time, the third insulator 201a drives the T-shaped shaft 201b to move. The movement of the T-shaped shaft 201b drives the contact knife body 102c to flip, thereby achieving the closing function. The rotation of the driven rod 202a can be facilitated by the supporting iron plate 202e.

[0061] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape, and proportions of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of the invention. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structurally equivalent but also equivalent in structure. Other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments without departing from the scope of the invention. Therefore, the present invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0062] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the currently considered best mode for carrying out the invention, or those features that are not relevant to implementing the invention) may be omitted.

[0063] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0064] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A knife contact device for a high-voltage disconnector, characterized in that: include, A switch contact mechanism (100) includes an isolation assembly (101), a contact assembly (102) and a contact assembly (103) located on the isolation assembly (101); and, The drive mechanism (200) includes a connection component (201) connected to the blade assembly (102) and a drive component (202) connected to the connection component (201); The blade assembly (102) and the contact assembly (103) are interconnected, and the drive assembly (202) is mounted on the isolation assembly (101). The isolation assembly (101) includes an isolation steel plate (101a), a first insulator (101b) is provided on one side of the upper end of the isolation steel plate (101a), a second insulator (101c) is provided on the other side of the upper end of the isolation steel plate (101a), and a set of U-shaped steel plates (101d) is also provided at the bottom of the isolation steel plate (101a). The contact blade assembly (102) includes a first conductive copper connector (102a), a U-shaped copper sheet (102b) is fixedly connected to the upper side of the first conductive copper connector (102a), a contact blade body (102c) is rotatably connected to the middle of the U-shaped copper sheet (102b), and a positioning shaft hole (102d) is also provided on the contact blade body (102c). The contact assembly (103) includes a second conductive copper connector (103a), and a third conductive copper connector (103b) is rotatably connected to the second conductive copper connector (103a). The first conductive copper connector (102a) is fixedly installed on the first insulator (101b), and the second conductive copper connector (103a) is fixedly installed on the second insulator (101c). The second conductive copper connector (103a) includes a second conductive copper connector body (103a-1), and a supporting round rod (103a-2) is provided at one end of the second conductive copper connector body (103a-1); The third conductive copper connector (103b) includes a third conductive copper connector body (103b-1), a support ring sleeve (103b-2) is provided on one side of the third conductive copper connector body (103b-1), and a spring (103b-3) is also provided on one side of the third conductive copper connector body (103b-1) located below the support ring sleeve (103b-2). The third conductive copper connector body (103b-1) is rotatably connected around the support rod (103a-2) via a support ring (103b-2); One end of the third conductive copper connector body (103b-1) is provided with an arc-shaped inlet head (103b-4), and the other end of the third conductive copper connector body (103b-1) is provided with a short support frame (103b-5). The short support frame (103b-5) can contact the blade body (102c); The second conductive copper connector body (103a-1) is also provided with a limiting long groove (103a-4); The third conductive copper connector body (103b-1) is provided with a connecting rod (103b-6) on one side below the spring (103b-3), and a counterweight (103b-7) is provided at the end of the connecting rod (103b-6). The connecting rod (103b-6) passes through the limiting groove (103a-4). When the third conductive copper connector body (103b-1) is connected by rotating around the supporting round rod (103a-2) via the supporting ring (103b-2), the connecting rod (103b-6) moves within the limiting groove (103a-4) to play a limiting role.

2. The high-voltage disconnector switch knife contact device as described in claim 1, characterized in that: The second conductive copper connector body (103a-1) is also provided with an L-shaped bracket (103a-3) on one side of the supporting round rod (103a-2), and the L-shaped bracket (103a-3) can restrict the rotation of the supporting ring (103b-2).

3. The high-voltage disconnector switch knife contact device as described in claim 2, characterized in that: The connecting assembly (201) includes a third insulator (201a), one end of which is provided with a T-shaped shaft (201b), and the other end of which is provided with an insulator rotating connection end (201c). The T-shaped shaft (201b) is rotatably connected to the positioning shaft hole (102d), and the insulator rotatable connection end (201c) is rotatably connected to the drive assembly (202).

4. The knife contact device for a high-voltage disconnector as described in claim 3, characterized in that: The drive assembly (202) includes a driven rod (202a), and the driven rod (202a) is provided with an extension bracket (202b); The insulator rotatable connection end (201c) is rotatably connected to the extension bracket (202b).

5. The high-voltage disconnector switch knife contact device as described in claim 4, characterized in that: A locking disc (202c) is provided on one side of the driven rod (202a), and a driving rod (202d) is also provided on the locking disc (202c); The isolation steel plate (101a) is also provided with a supporting iron plate (202e), and the driven rod (202a) is rotatably connected to the supporting iron plate (202e).

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