Wiring terminal block structure

By adopting a self-reset screw assembly and guide structure in the terminal block, the problems of screw loss and lateral deformation of the compression spring are solved, and a more stable and convenient cable connection and disassembly process is achieved.

CN222233887UActive Publication Date: 2024-12-24CHENGDU RELIANCE ELECTRIC
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Patent Information

Application Number
CN202323398283.3
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2023-12-13
Publication Date
2024-12-24
Estimated Expiration
2033-12-13

AI Technical Summary

Technical Problem

The existing terminal blocks are prone to the loss of screws during use, and the lateral deformation of the compression spring due to stress during use, affecting the reset of the guide gasket.

Method used

It adopts a self-reset screw assembly, including a support plate, a compression spring and a reset screw. The support plate is slidably mounted on the insulating member. The reset screw is connected to the wiring assembly through the support plate. The compression spring is located between the support plate and the insulating member, and the protective cover is passed through. The snap-on installation, the through hole corresponds to the reset screw, and the guide structure and guide concave wrap the compression spring to prevent lateral deformation.

Benefits of technology

Effectively avoid the loss of screws, improve the convenience of connection and disassembly, ensure accurate reset of reset screws, prevent lateral deformation of the compression spring, and improve the stability and convenience of use of the device.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a wiring terminal block structure which comprises an insulating part and a protective cover, the insulating part is provided with a plurality of wiring assemblies, the wiring assemblies comprise long wiring assemblies and short wiring assemblies, and the long wiring assemblies and the short wiring assemblies are arranged side by side; a plurality of self-resetting screw assemblies are arranged on the insulating part in a sliding manner, each self-resetting screw assembly comprises a supporting plate, a pressure spring and a resetting screw, the supporting plates are arranged on the insulating part in a sliding manner, the resetting screws penetrate through the supporting plates and then are used for being in threaded connection with the long wiring assemblies or the short wiring assemblies, and the pressure springs are located between the supporting plates and the insulating part; the protective cover is installed on the insulating part, a plurality of through holes are formed in the protective cover, the through holes correspond to reset screws in the self-reset screw assembly, and the reset screws abut against the protective cover under the action of the compression spring. According to the utility model, the technical problems that the screws on the wiring terminal strip are easy to lose and the maintenance is inconvenient can be solved in actual use.
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Description

Technical Field

[0001] The utility model relates to the technical field of cable connection, in particular to a wiring terminal row structure. Background Art

[0002] Nowadays, the use of terminal blocks is more common in the electrical field. Terminal blocks are an electrical component used to connect circuits. The number of terminal blocks in each row is different, which makes it convenient and intuitive to check the wiring status and easy to distinguish.

[0003] The utility model patent with patent number CN202223232631.5 discloses a terminal block, in which the terminal block is a frame structure with a cavity surrounded by several plates. Compared with the copper column structure or other solid metal column structures in the related technology, the raw material usage of the terminal block is effectively reduced. In addition, connecting holes and wiring holes are arranged on the frame structure, which saves time and labor, and can reduce the amount of raw materials removed, thereby reducing the waste of raw materials; it effectively reduces the raw material usage of the terminal block, but the terminal block is fixed with screws during use. The screws need to be removed when wiring, which can easily cause the screws to be lost and make maintenance inconvenient.

[0004] The utility model with application number: CN201320584287.8 discloses an anti-slip structure of a panel-type terminal block, wherein a top cover for limiting is integrally fixed above an external wiring slot, and a fastener capable of locking on the upper end of a conductive sheet is arranged in the external wiring slot, wherein the fastener is a necked screw with a guide gasket clamped therein, and a spring in a compressed state is sleeved on the guide gasket, and when the necked screw is loosened, it can move toward the top cover under the elastic action of the compression spring and the guiding action of the guide gasket and can be stopped at the top cover; the structure can lock the wire from the side of the terminal block without removing the top cover during wiring, thereby ensuring the wiring accuracy and improving the wiring efficiency, and since the anti-slip limiting structure is adopted, the screw will not slip off; however, in actual use, the spring is coaxially arranged on the "L"-shaped structure of the guide gasket, and when in use, it is easy to cause lateral deformation due to force problems, affecting the resetting of the guide gasket. Utility Model Content

[0005] The purpose of the utility model is to provide a terminal block structure, which can solve the technical problem that screws on the terminal block are easily lost in actual use; at the same time, it can also solve the technical problem that lateral deformation of the compression spring occurs during use, affecting the resetting of the guide gasket.

[0006] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0007] A terminal block structure includes an insulating member, the utility model also includes a protective cover, a plurality of wiring assemblies are arranged on the insulating member, the wiring assemblies include a long wiring assembly and a short wiring assembly, and the long wiring assembly and the short wiring assembly are arranged side by side;

[0008] A plurality of self-resetting screw assemblies are slidably arranged on the insulating member, and each long wiring assembly and short wiring assembly corresponds to a self-resetting screw assembly;

[0009] The self-resetting screw assembly includes a support plate, a compression spring and a reset screw. The support plate is slidably arranged on the insulating member. The reset screw passes through the support plate and is used to be threadedly connected with the long wiring assembly or the short wiring assembly. The compression spring is located between the support plate and the insulating member. The protective cover is mounted on the insulating member by snap-fitting. The protective cover is provided with a plurality of through holes, which correspond to the reset screws in the self-resetting screw assembly. Under the action of the compression spring, the reset screw is pressed against the protective cover.

[0010] The insulating member is provided with a guide structure, the guide structure is provided with a guide concave surface, and the compression spring is in contact with the guide concave surface on the guide structure.

[0011] Furthermore, the support plate is provided with guide posts, the insulating member is provided with guide grooves corresponding to the guide posts, and the support plate is slidably mounted on the insulating member via the guide posts and the guide grooves.

[0012] Wherein, the protective cover is provided with a matching groove connected with the through holes, and the matching groove matches the end of the reset screw.

[0013] Further optimization is that a vertical partition plate is arranged on the insulating member, and a plurality of transverse partition plates perpendicular to the vertical partition plates are arranged, a movable area is formed between adjacent transverse partition plates, and the support plate is slidably installed in the movable area.

[0014] Wherein, a first guide plate and a second guide plate are arranged in each active area, the first guide plate, the second guide plate and the vertical partition plate form the guide groove, an installation area is formed between the first guide plate and the second guide plate, and the compression spring is installed in the installation area.

[0015] It is further defined that a guide concave surface is provided on one side of the first guide plate and the second guide plate close to the compression spring.

[0016] Further optimized, the protective cover is connected to the horizontal partition plates located on both sides of the insulating member by snap-fitting.

[0017] Wherein, a snap-fitting column is arranged at the intersection of the vertical partition plate and the horizontal partition plate, and a snap-fitting hole corresponding to the snap-fitting column is arranged on the protective cover, and the snap-fitting column and the snap-fitting hole are interference fit.

[0018] It is further defined that the long wiring assembly and the short wiring assembly both include a conductive sheet, a nut and a screw, and the length of the conductive sheet in the long wiring assembly is greater than the length of the conductive sheet in the short wiring assembly;

[0019] The insulating member is provided with a plurality of first mounting grooves and a second mounting groove, and the side surface is provided with a third mounting groove communicating with the first mounting groove and a fourth mounting groove communicating with the second mounting groove;

[0020] After the conductive sheet in the long wiring assembly is installed in the first mounting groove, the lower end of the conductive sheet extends into the third mounting groove, and after the conductive sheet in the short wiring assembly is installed in the second mounting groove, the lower end of the conductive sheet extends into the fourth mounting groove; the nuts in the long wiring assembly and the short wiring assembly are respectively installed in the third and fourth mounting grooves, and the screws are connected to the nuts after passing through the conductive sheet, and a threaded hole threadedly connected to the reset screw is provided on the conductive sheet.

[0021] Compared with the prior art, the utility model has the following beneficial effects:

[0022] The utility model is mainly used for realizing the connection of cables. When in use, it is installed on the equipment to realize the connection of cables inside and outside the equipment. The cable connection is realized by setting a self-resetting screw assembly, and the screws can be prevented from being lost. When in use, the cables that do not need to be frequently inspected or disassembled are connected with the long wiring assembly and the short wiring assembly, and the cables that need to be frequently disassembled and inspected are fixed on the insulating member by the self-resetting screw assembly. Since the support plate is slidably arranged on the insulating member, the reset spring can be pressed against the protective cover under the action of the compression spring. When connecting the cables, a screwdriver is used to push the reset screw toward the wiring assembly, so that the cable can be fixed after the reset screw is connected to the wiring assembly. After disassembly, the reset screw can be directly reset under the action of the compression spring and the support plate, so the screw can be effectively prevented from being lost. At the same time, it is also more convenient when connecting the cables, which is convenient for the staff to disassemble and inspect the cables.

[0023] More importantly, the guide structure and guide concave surface provided in the present application can form a wrapping feature for the compression spring, which can prevent the compression spring from undergoing lateral deformation due to force problems, ensure the accurate resetting of the support plate, and improve the stability of the device during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solution of the implementation mode of the utility model, the drawings required for use in the implementation mode will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1It is a schematic diagram of the overall structure of the utility model.

[0026] Figure 2 It is a schematic diagram of the internal structure of the utility model.

[0027] Figure 3 It is a schematic diagram of the overall structure of the insulating component of the utility model.

[0028] Figure 4 For this utility model Figure 1 Schematic diagram of the structure after removing the insulating parts and protective covers.

[0029] Figure 5 It is a schematic diagram of the assembly relationship between the support plate and the reset screw of the utility model.

[0030] Reference numerals:

[0031] 101-insulating member, 102-protective cover, 103-wiring assembly, 104-long wiring assembly, 105-short wiring assembly, 106-self-resetting screw assembly, 107-support plate, 108-compression spring, 109-resetting screw, 110-through hole, 111-guide column, 112-guide groove, 113-matching groove, 114-vertical partition plate, 115-transverse partition plate, 116-first guide plate, 117-second guide plate, 118-guide concave surface, 119-engaging column, 120-engaging hole, 121-square groove, 122-nut, 123-screw, 124-first mounting groove, 125-second mounting groove, 126-third mounting groove, 127-fourth mounting groove, 128-threaded hole, 129-long conductive sheet, 130-short conductive sheet. DETAILED DESCRIPTION

[0032] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the embodiments of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0033] In the description of the embodiments of the present invention, it should be understood that the terms "length", "vertical", "horizontal", "top", "bottom", etc. indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present invention.

[0034] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0035] In the embodiments of the present utility model, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0036] In the embodiments of the present utility model, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, the first feature being "above", "above" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0037] The disclosure below provides many different embodiments or examples for realizing different structures of the embodiments of the present utility model. In order to simplify the disclosure of the embodiments of the present utility model, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the embodiments of the present utility model. In addition, the embodiments of the present utility model can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0038] The embodiments of the present utility model are described in detail below with reference to the accompanying drawings.

[0039] Embodiment 1

[0040] See also Figure 1-Figure 5, this embodiment discloses a terminal block structure, including an insulating member 101 and a protective cover 102, a plurality of wiring assemblies 103 are arranged on the insulating member 101, and the wiring assemblies 103 include a long wiring assembly 104 and a short wiring assembly 105, and the long wiring assembly 104 and the short wiring assembly 105 are arranged side by side;

[0041] A plurality of self-resetting screw assemblies 106 are slidably disposed on the insulating member 101, and each long wiring assembly 104 and short wiring assembly 105 corresponds to a single self-resetting screw assembly 106;

[0042] The self-resetting screw assembly 106 includes a support plate 107, a compression spring 108 and a reset screw 109. The support plate 107 is slidably arranged on the insulating member 101. The reset screw 109 passes through the support plate 107 and is used to be threadedly connected with the long wiring assembly 104 or the short wiring assembly 105. The compression spring 108 is located between the support plate 107 and the insulating member 101. The protective cover 102 is mounted on the insulating member 101 by snap-fitting. The protective cover 102 is provided with a plurality of through holes 110. The through holes 110 correspond to the reset screws 109 in the self-resetting screw assembly 106. Under the action of the compression spring 108, the reset screw 109 presses against the protective cover 102.

[0043] The insulating member 101 is provided with a guide structure, and a guide concave surface is provided on the guide structure. The compression spring 108 is in contact with the guide concave surface on the guide structure.

[0044] The utility model is mainly used to achieve cable connection. When in use, it is installed on the equipment to achieve the connection of cables inside and outside the equipment; the cable connection is achieved by setting a self-resetting screw assembly 106, and the screw 123 can be prevented from being lost; when in use, the cables that do not need to be frequently repaired or disassembled are connected to the long wiring assembly 104 and the short wiring assembly 105, and the cables that need to be frequently disassembled and repaired are fixed on the insulating member by the self-resetting screw assembly 106. Since the support plate 107 is slidably arranged on the insulating member, the reset spring can be pressed against the protective cover 102 under the action of the compression spring 108. When connecting the cables, a screwdriver is used to push the reset screw 109 toward the wiring assembly 103, so that the cable can be fixed after the reset screw 109 is connected to the wiring assembly 103; after disassembly, the reset screw 109 can be directly reset under the action of the compression spring 108 and the support plate 107, which can effectively prevent the screw 123 from being lost; at the same time, it is also more convenient when connecting the cables, which is convenient for the staff to disassemble and repair the cables.

[0045] Among them, a guide column 111 is arranged on the support plate 107, and the guide column 111 includes a first guide column and a second guide column. A guide groove 112 corresponding to the guide column 111 is arranged on the insulating member, and the guide groove 112 is specifically a first guide groove and a second guide groove. The first and second guide columns correspond to the first and second guide grooves respectively. The support plate 107 is slidably installed on the insulating member through the guide column 111 and the guide groove 112; in this way, the support plate 107 can slide smoothly on the insulating member to ensure that the reset screw 109 can be aligned with the wiring assembly 103, so as to facilitate the connection with the wiring assembly 103.

[0046] Among them, the protective cover 102 is provided with a matching groove 113 connected to the through hole 110, and the matching groove 113 matches the end of the reset screw 109; a limiting structure can be formed by setting the matching groove 113, which can enable the reset screw 109 to better contact with the protective cover 102.

[0047] A vertical partition plate 114 is disposed on the insulating member, and a plurality of transverse partition plates 115 perpendicular to the vertical partition plates 114 are disposed. An active area is formed between adjacent transverse partition plates 115, and the support plate 107 is slidably installed in the active area.

[0048] This makes it easier to separate the wiring positions and also enables the support plate 107 to move more stably.

[0049] Among them, a first guide plate 116 and a second guide plate 117 are arranged in each active area, and the first guide plate 116, the second guide plate 117 and the vertical partition plate 114 form the guide groove 112, and an installation area is formed between the first guide plate 116 and the second guide plate 117, and the compression spring 108 is installed in the installation area; this can ensure that the self-resetting screw assembly 106 can move straight up and down, and ensure the stability of the self-resetting screw assembly 106 when moving.

[0050] Among them, a guide concave surface 118 is arranged on the first guide plate 116 and the second guide plate 117 near the compression spring 108; the arranged guide concave surface 118 can form a wrapping feature for the compression spring 108, and can prevent the compression spring 108 from undergoing lateral deformation due to force problems. In this embodiment, the first guide plate 116 and the second guide plate 117 constitute the guide structure.

[0051] In actual use, the guiding concave surface is specifically a guiding cambered surface.

[0052] Among them, the protective cover 102 is connected to the horizontal partition plates 115 located on both sides of the insulating member through snaps; a snap-fitting column 119 is arranged at the intersection of the vertical partition plate 114 and the horizontal partition plate 115, and a snap-fitting hole 120 corresponding to the snap-fitting column 119 is arranged on the protective cover 102, and the snap-fitting column 119 and the snap-fitting hole 120 are interference fit; two buckle points can be formed by the provided snaps, the snap-fitting columns 119 and the snap-fitting grooves, thereby ensuring the stability of the connection between the protective cover 102 and the insulating member 101.

[0053] The long wiring assembly 104 and the short wiring assembly 105 both include a conductive sheet, a nut 122 and a screw 123, and the length of the conductive sheet in the long wiring assembly 104 is greater than the length of the conductive sheet in the short wiring assembly 105;

[0054] The insulating member 101 is provided with a plurality of first mounting grooves 124 and second mounting grooves 125, and the side thereof is provided with a third mounting groove 126 communicating with the first mounting groove 124 and a fourth mounting groove 127 communicating with the second mounting groove 125;

[0055] After the conductive sheet in the long wiring assembly 104 is installed in the first mounting groove 124, the lower end of the conductive sheet extends into the third mounting groove 126; after the conductive sheet in the short wiring assembly 105 is installed in the second mounting groove 125, the lower end of the conductive sheet extends into the fourth mounting groove 127; the nuts 122 in the long wiring assembly 104 and the short wiring assembly 105 are respectively installed in the third and fourth mounting grooves 127, and the screw 123 passes through the conductive sheet and is connected to the nut 122, and a threaded hole 128 threadedly connected to the reset screw 109 is provided on the conductive sheet.

[0056] Among them, in this embodiment, the conductive sheets in the long wiring component 104 and the short wiring component 105 are respectively a long conductive sheet and a short conductive sheet; the long conductive sheet and the short conductive sheet are fixedly installed in the first installation groove 124 and the third installation groove 126 in a snap-fit ​​manner.

[0057] In actual use, the second mounting groove 125 and the fourth mounting groove 127 are stepped square grooves 121, and the nut 122 is installed in the square groove 121 to fix the nut 122; at the same time, the long conductive sheet 129 and the short conductive sheet 130 extend into the second mounting groove 125 and the third mounting groove 126 to limit the nut 122.

[0058] In this embodiment, the insulating member 101 is an embedded component, which is formed by a grounding nut, a mounting nut and an insulator sealed in plastic. The protective cover 102 is made of a transparent material and is fixedly connected to the insulating member 101 .

[0059] In this embodiment, the long conductive sheet 129 and the short conductive sheet 130 are fixedly installed in the first installation groove 124 and the third installation groove 126 in a snap-fit ​​manner, which not only realizes the fixed installation of the long conductive sheet 129 and the short conductive sheet 130, but also can realize the closure of the nut 122, thereby preventing the conductive sheet and the nut 122 from falling off.

[0060] In actual use, the reset screw 109 is rotatably connected to the support plate 107 .

[0061] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present invention.

[0062] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. It should be pointed out that any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A terminal block structure, comprising an insulating member, characterized in that: It also includes a protective cover, and a plurality of wiring assemblies are arranged on the insulating member, wherein the wiring assemblies include a long wiring assembly and a short wiring assembly, and the long wiring assembly and the short wiring assembly are arranged side by side; A plurality of self-resetting screw assemblies are slidably arranged on the insulating member, and each long wiring assembly and short wiring assembly corresponds to a single self-resetting screw assembly; the self-resetting screw assembly comprises a support plate, a compression spring and a reset screw, the support plate is slidably arranged on the insulating member, the reset screw passes through the support plate and is used for threaded connection with the long wiring assembly or the short wiring assembly, and the compression spring is located between the support plate and the insulating member; the protective cover is mounted on the insulating member by snap-fitting, and a plurality of through holes are arranged on the protective cover, and the through holes correspond to the reset screws in the self-resetting screw assembly, and under the action of the compression spring, the reset screw is pressed against the protective cover; The insulating member is provided with a guide structure, the guide structure is provided with a guide concave surface, and the compression spring is in contact with the guide concave surface on the guide structure.

2. A terminal block structure according to claim 1, characterized in that: The support plate is provided with guide posts, which include first guide posts and second guide posts. The insulating member is provided with guide grooves corresponding to the guide posts. The support plate is slidably mounted on the insulating member through the guide posts and the guide grooves.

3. A terminal block structure according to claim 1, characterized in that: The protective cover is provided with a matching groove connected with the through holes, and the matching groove matches the end of the reset screw.

4. A terminal block structure according to claim 2, characterized in that: The insulating member is provided with a vertical partition plate and a plurality of transverse partition plates perpendicular to the vertical partition plates. An active area is formed between adjacent transverse partition plates, and the support plate is slidably installed in the active area.

5. A terminal block structure according to claim 4, characterized in that: A first guide plate and a second guide plate are provided in each active area, the first guide plate and the second guide plate constitute the guide structure, the first guide plate, the second guide plate and the vertical partition plate form the guide groove, an installation area is formed between the first guide plate and the second guide plate, and the compression spring is installed in the installation area.

6. A terminal block structure according to claim 5, characterized in that: The first guide plate and the second guide plate are provided with the guide concave surface on one side close to the compression spring.

7. A terminal block structure according to claim 6, characterized in that: The protective cover is connected to the transverse partition plates located on both sides of the insulating member through buckles.

8. The terminal block structure according to claim 6, characterized in that: A clamping column is arranged at the intersection of the vertical partition plate and the horizontal partition plate, and a clamping hole corresponding to the clamping column is arranged on the protective cover, and the clamping column and the clamping hole are interference fit.

9. A terminal block structure according to any one of claims 1 to 8, characterized in that: The long wiring assembly and the short wiring assembly both include a conductive sheet, a nut and a screw, and the length of the conductive sheet in the long wiring assembly is greater than the length of the conductive sheet in the short wiring assembly; The insulating member is provided with a plurality of first mounting grooves and a second mounting groove, and the side surface is provided with a third mounting groove communicating with the first mounting groove and a fourth mounting groove communicating with the second mounting groove; After the conductive sheet in the long wiring assembly is installed in the first mounting groove, the lower end of the conductive sheet extends into the third mounting groove, and after the conductive sheet in the short wiring assembly is installed in the second mounting groove, the lower end of the conductive sheet extends into the fourth mounting groove; the nuts in the long wiring assembly and the short wiring assembly are respectively installed in the third and fourth mounting grooves, and the screws are connected to the nuts after passing through the conductive sheet, and a threaded hole threadedly connected to the reset screw is provided on the conductive sheet.