CN216133791U - Small-size reset switch - Google Patents

Abstract

The utility model provides a small reset switch which comprises a switch body, an output terminal component, an elastic conductive piece and a button structure, wherein a first contact piece and a second contact piece are respectively arranged in a first cavity part and a second cavity part of the switch body, the elastic conductive piece is arranged between the first cavity part and the second cavity part and comprises elastic trigger pins which are respectively bent and extend through the first cavity part and are opposite to the first contact piece, and elastic pressing pins which extend through the second cavity part and abut against the second contact piece, and the bottom of the button structure is clamped on the elastic trigger pins. The electrically conductive effect that both had played elasticity reset to the button structure of this scheme of adoption design is in simultaneously again play the effect of switch-on conductive loop between first contact and the second contact, have good elastic deformation ability and electric conductive property, compare in traditional multilayer metal dome shell fragment occupation space little, the structure sets up simply, and it is comparatively convenient to install, is favorable to doing for a short time with product volume, reduce cost.

Description

Small-size reset switch

Technical Field

The utility model relates to the technical field of switches, in particular to a small reset switch.

Background

The reset switch is a small electronic switch, and can realize that the button is restored to the original position through each on-off operation. The reset switch is used for realizing current electrifying operation in a circuit, the reset switch can be switched on by lightly pressing the button position of the switch when in use, the reset switch can be switched off when the hand is loosened, the internal structure of the reset switch realizes on-off by the elastic force of a metal elastic sheet (a metal dome elastic sheet), the light touch switch has the advantages of small contact resistance load, accurate operation force error, diversified specifications and the like, and the light touch switch is widely applied to the aspects of electronic equipment and the like.

Common small-size reset switch on the market mainly includes base and upper cover, and locate the button between base and the upper cover, be equipped with the inner chamber that is used for installing the metal dome shell fragment in the base, be equipped with the first terminal that is in the center in the inner chamber, and two second terminals on middle contact both sides are located to the branch relatively, this kind of metal dome shell fragment is circular form and has the bulge that central point put hunch-up, the edge butt with the metal dome shell fragment is on two second terminals, as long as push down the button, can order about the metal dome shell fragment and take place deformation, make its central bulge and first terminal contact, thereby switch on the inside return circuit of switch. However, in practical use, the deformation restoring force of the metal dome elastic sheet adopted by the small reset switch is not large enough, so that the button is not favorable for quick reset, two or more metal dome elastic sheets are often required to be stacked, the structure is complex to set, the occupied space is also large, the product volume is larger, and the product is not favorable for the development of miniaturization trend.

SUMMERY OF THE UTILITY MODEL

Therefore, the utility model aims to overcome the defects in the prior art, and provides the small reset switch which has the advantages of simple structure, convenience in installation, strong elastic deformation capacity, contribution to reducing the volume of a product, reducing the cost and improving the service performance of the product.

To achieve the above object, the present invention provides a small reset switch comprising:

the switch comprises a switch body and a switch cover, wherein the switch body is provided with an installation inner cavity, and a middle partition board which divides the installation inner cavity into a first cavity part and a second cavity part is arranged in the installation inner cavity;

the output end assembly comprises a first contact piece and a second contact piece which are respectively arranged in the first cavity part and the second cavity part, and a first terminal structure and a second terminal structure which are respectively arranged on two sides of the bottom of the switch body in a penetrating mode, wherein the first terminal structure is connected with the first contact piece, and the second terminal structure is connected with the second contact piece;

the elastic conductive piece is arranged between the first cavity part and the second cavity part and comprises an elastic triggering pin and an elastic pressing pin which are respectively bent and stretched in the first cavity part and the second cavity part, the elastic triggering pin is opposite to the first contact piece, and the elastic pressing pin is pressed against the second contact piece;

the button structure is movably arranged at the top of the switch body in a penetrating mode, the bottom of the button structure extends into the installation inner cavity and is clamped and abutted on the elastic trigger pin, and the button structure drives the elastic trigger pin to deform and abut against the first contact piece when being pressed down.

As a preferred scheme, an accommodating area suitable for installing the elastic conductive piece is arranged between the first cavity part and the second cavity part in a connecting mode, and the elastic conductive piece comprises a cylindrical spring main body accommodated in the accommodating area, and an elastic triggering foot and an elastic pressing foot which are formed by extending two ends of the spring main body.

As a preferable scheme, the accommodating area comprises a U-shaped limiting groove formed on the intermediate partition plate, a limiting pressing block opposite to the U-shaped limiting groove is arranged at the top of the switch body, and the spring body is pressed between the U-shaped limiting groove and the limiting pressing block.

Preferably, the elastic trigger foot comprises a V-shaped connecting part and a hook part formed by obliquely bending one end of the V-shaped connecting part, and the bottom of the button structure abuts against one side edge of the V-shaped connecting part.

Preferably, the hook portion has an arc end for contacting the first contact piece, and the elastic pressing pin is disposed in an inclined manner.

As a preferable scheme, the button structure is in a long strip shape, a driving boss matched and abutted with the elastic triggering pin is arranged at the bottom of the button structure, an abutting groove is formed in the driving boss, and the V-shaped connecting portion of the elastic triggering pin is inserted into the abutting groove.

Preferably, the first contact piece and the second contact piece are respectively arranged on the bottom surfaces of the first cavity part and the first cavity part in a strip shape in a left-right staggered manner; the first terminal structure and the second terminal structure respectively comprise a pair of Z-shaped terminal pins extending out of two sides of the bottom of the switch body.

As a preferred scheme, the switch body comprises a base provided with the installation inner cavity and an upper cover fixed on the base through a connecting structure, a positioning column is arranged at the bottom of the base, the upper cover comprises a guide sliding hole for the button structure to vertically slide, and a guide column structure formed on the top surface of the upper cover along the axial direction of the guide sliding hole, the guide sliding hole penetrates through the guide column structure, and a blocking step matched and abutted to the bottom surface of the upper cover is arranged on the driving boss.

As a preferable scheme, the limiting pressing block is formed on the bottom surface of the upper cover and is pressed against the spring main body when the upper cover and the base are installed in a matched mode.

As a preferred scheme, the connection structure comprises two hanging buckle plates and two clamping platforms, wherein the two hanging buckle plates are arranged at the two ends of the upper cover and attached to the side wall of the base, the two clamping platforms are correspondingly arranged on the side wall of the base, and clamping holes matched with the clamping platforms in a clamping mode are formed in the hanging buckle plates.

The technical scheme of the utility model has the following advantages:

1. the utility model provides a small-sized reset switch, wherein an elastic conductive piece is arranged between a first cavity part and a second cavity part of a switch body, an elastic trigger pin of the elastic conductive piece penetrates into the first cavity part and is arranged opposite to a first contact piece, an elastic pressing foot of the elastic pressing piece penetrates into the second cavity part and is contacted with a second contact piece, the elastic trigger pin is clamped on the elastic trigger pin according to the bottom of a button structure, the elastic trigger pin can be driven to be contacted with the first contact piece by pressing the button structure, the circuit conduction between the first contact piece and a first terminal structure and between the second contact piece and a second terminal structure is realized, and the button structure is driven to reset in the process of restoring deformation of the elastic trigger pin, the elastic conductive piece designed by the scheme plays a role of elastic resetting for the button structure, and plays a role of connecting a conductive loop between the first contact piece and the second contact piece, have good elastic deformation ability and electric conductive property, it is little to compare in traditional multilayer metal dome shell fragment occupation space, and the structure sets up simply, and it is comparatively convenient to install, is favorable to doing for a short time with the product volume, and reduce cost promotes reset switch's performance.

2. According to the small reset switch provided by the utility model, the accommodating area is arranged between the first cavity part and the second cavity part, the elastic conductive piece comprises the spring main body accommodated in the accommodating area, the elastic trigger pin and the elastic pressing pin which are formed at two ends of the spring main body in an extending mode respectively extend into the first cavity part and the second cavity part, the accommodating area plays a limiting installation role on the spring main body, the spring main body is tightly installed in the accommodating area through the matching of the limiting lug and the U-shaped limiting groove, the situation that the installation position of the elastic conductive piece deviates and shakes in the installation inner cavity is prevented, the installation stability is good, the stable installation positions of the elastic trigger pin and the elastic pressing pin in the two cavity parts are also ensured, and the use reliability and stability of the elastic conductive piece are improved.

3. According to the small reset switch provided by the utility model, the abutting groove is formed in the driving boss at the bottom of the button structure, so that the V-shaped connecting part of the elastic triggering pin is inserted into the abutting groove, and the design has the advantages that the V-shaped connecting part of the elastic triggering pin plays a limiting connection role at the bottom of the driving boss, the elastic triggering pin is prevented from being elastically separated from the driving boss when being pressed, so that the driving boss is reliably connected with the elastic triggering pin, and the reliability and the stability of the transmission of motion and force between the button structure and the elastic triggering pin are ensured.

4. The two hanging buckle plates are arranged at the two ends of the upper cover, the two clamping tables are correspondingly arranged on the side wall of the base, the upper cover and the base are fixedly connected with the two clamping tables in a clamping matching mode through the two hanging buckle plates, the mounting structure is simple, the matching and fixing are reliable, when the upper cover and the base are mounted, the limiting pressing block arranged on the bottom surface of the upper cover just abuts against the spring main body, so that the positioning and mounting of the elastic conductive piece in the mounting inner cavity can be synchronously realized, the spring main body is pressed oppositely by the U-shaped limiting groove and the limiting pressing block, the limiting and anti-loosening effects are realized, and the mounting stability is good.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a perspective view of a miniature reset switch provided by the present invention;

FIG. 2 is a schematic view of a split structure of the miniature reset switch of the present invention;

FIG. 3 is a schematic diagram of the internal structure of the switch body according to the present invention;

FIG. 4 is a schematic diagram of the distribution structure of the output terminal assembly on the switch body according to the present invention

FIG. 5 is a schematic structural diagram of an elastic conductive device according to the present invention;

description of reference numerals: 1. a switch body; 11. a middle partition plate; 12. a base; 13. an upper cover; 2. installing an inner cavity; 21. a first cavity section; 22. a second cavity section; 23. a U-shaped limiting groove; 3. a first terminal structure; 31. a first contact piece; 4. a second terminal structure; 41. a second contact piece; 5. an elastic conductive member; 50. a spring body; 51. an elastic trigger foot; 511. a V-shaped connecting portion; 512. a hook portion; 52. elastic pressing feet; 6. a button structure; 61. driving the boss; 62. abutting against the groove; 63. a resisting step; 7. hanging a buckle plate; 71. clamping a platform; 8. a limiting pressing block; 9. a guide post structure; 91. and (4) guiding the sliding hole.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

Examples

The present embodiment provides a small reset switch as shown in fig. 1 to 5, comprising:

the switch comprises a switch body 1 and a switch cover, wherein the switch body is provided with an installation inner cavity 2, and a middle partition plate 11 for dividing the installation inner cavity 2 into a first cavity part 21 and a second cavity part 22 is arranged in the installation inner cavity 2;

an output terminal assembly, which comprises a first contact piece 31 and a second contact piece 41 respectively arranged in the first cavity part 21 and the second cavity part 22, and a first terminal structure 3 and a second terminal structure 4 respectively arranged at two sides of the bottom of the switch body 1 in a penetrating way, wherein the first terminal structure 3 is connected with the first contact piece 31, and the second terminal structure 4 is connected with the second contact piece 41;

the elastic conductive piece 5 is arranged between the first cavity part 21 and the second cavity part 22 and comprises an elastic triggering pin 51 and an elastic pressing pin 52 which are respectively bent and extended in the first cavity part 21 and the second cavity part 22, the elastic triggering pin 51 is arranged opposite to the first contact piece 31, and the elastic pressing pin 52 is pressed against the second contact piece 41;

the button structure 6 is movably arranged at the top of the switch body 1 in a penetrating mode, the bottom of the button structure extends into the installation inner cavity 2 and is clamped and supported on the elastic trigger foot 51, and the button structure 6 drives the elastic trigger foot 51 to deform and abut against the first contact piece 31 when being pressed down.

In the above embodiment, by providing the elastic conductive member 5 between the first cavity portion 21 and the second cavity portion 22 of the switch body 1, the elastic triggering pin 51 of the elastic conductive member 5 is inserted into the first cavity portion 21 and is disposed opposite to the first contact piece 31, and the elastic pressing pin 52 is inserted into the second cavity portion 22 and contacts with the second contact piece 41, the bottom of the button structure 6 is pressed against the elastic triggering pin 51, and the button structure 6 is pressed to drive the elastic triggering pin 51 to contact with the first contact piece 31, so as to realize the circuit conduction between the first contact piece 31 and the first terminal structure 3 and between the second contact piece 41 and the second terminal structure 4, and drive the button structure 6 to reset when the elastic triggering pin 51 restores to deformation, the elastic conductive member 5 designed by this scheme not only plays the role of elastic resetting for the button structure 6, but also plays the role of conducting circuit between the first contact piece 31 and the second contact piece 41, have good elastic deformation ability and electric conductive property, it is little to compare in traditional multilayer metal dome shell fragment occupation space, and the structure sets up simply, and it is comparatively convenient to install, is favorable to doing for a short time with the product volume, and reduce cost promotes reset switch's performance.

The following detailed description of the specific arrangement of the elastic conductive member is made with reference to fig. 3-5:

a containing area suitable for installing the elastic conductive piece 5 is arranged between the first cavity part 21 and the second cavity part 22, the elastic conductor 5 comprises a cylindrical spring body 50 housed in the housing zone, and an elastic trigger foot 51 and an elastic pressing foot 52 formed by extending from both ends of the spring body 50, according to the length extending direction of the accommodating area is vertical to the length extending direction of the first cavity part 21 and the second cavity part 22, the elastic triggering foot 51 and the elastic pressing foot 52 extend into the first cavity part 21 and the second cavity part 22 respectively in a staggered manner, wherein the accommodating area comprises a U-shaped limiting groove 23 formed on the middle clapboard 11, the top of the switch body 1 is provided with a limit pressing block 8 opposite to the U-shaped limit groove 23, the spring body 50 is compressed between the U-shaped limiting groove 23 and the limiting pressing block 8. According to the structure, the spring main body 50 is limited and mounted through the containing area, the spring main body 50 is tightly pressed and mounted in the containing area through the matching of the limiting convex block and the U-shaped limiting groove 23, so that the elastic conductive piece 5 is prevented from generating mounting position deviation and shaking in the mounting inner cavity 2, the mounting stability is good, the mounting positions of the elastic triggering pin 51 and the elastic pressing pin 52 in the two cavity parts are stable, and the use reliability and stability of the elastic conductive piece 5 are improved.

As a specific structure, the elastic trigger pin 51 includes a V-shaped connection portion 511, and a hook portion 512 formed by bending one end of the V-shaped connection portion 511 in an inclined manner, the bottom of the button structure 6 abuts against one side of the V-shaped connection portion 511, the hook portion 512 has an arc end for contacting the first contact piece 31, the arc end design is favorable for reducing contact damage caused by abutting between the hook portion 512 and the first contact piece 31, the elastic abutting pin 52 is obliquely arranged and abuts against the second contact piece 41, as shown in fig. 4, the first contact piece 31 and the second contact piece 41 are respectively arranged on the bottom surfaces of the first cavity portion 21 and the first cavity portion 21 in a strip-shaped manner, the first terminal structure 3 and the second terminal structure 4 respectively include a pair of Z-shaped end pins extending out of both sides of the bottom of the switch body, and are attached to a circuit board through the Z-shaped end pins, adopt surface mounting welding mode to weld the Z shape end foot of first terminal structure 3 and second terminal respectively on the circuit board, improve welding work efficiency, this kind of structure setting, works as button structure 6 pushes down the drive when V-arrangement connecting portion 511 takes place deformation, make the circular arc end downward bias voltage butt of crotch portion 512 be in on the first contact 31, through the intercommunication first contact 31 and second contact 41 are in order to realize the conductive loop switch-on between first terminal structure 3 and the second terminal structure 4.

As shown in fig. 2, the button structure 6 is in an elongated shape, and a driving boss 61 is provided at the bottom of the button structure, the driving boss 61 is provided with an abutting groove 62, and the V-shaped connecting portion 511 of the elastic triggering foot 51 is inserted into the abutting groove 62, so that the advantage of the design is that the V-shaped connecting portion 511 of the elastic triggering foot 51 plays a role in limiting connection at the bottom of the driving boss 61, and the elastic triggering foot 51 is prevented from being elastically separated from the driving boss 61 when being pressed, so that the driving boss 61 and the elastic triggering foot 51 are reliably connected, thereby ensuring the reliability and stability of the transmission of motion and force between the button structure 6 and the elastic triggering foot 51.

In this embodiment, as shown in fig. 1-2, the switch body includes a base 12 having the installation cavity 2, and an upper cover 13 fixed on the base 12 through a connection structure, the bottom of the base 12 is provided with a positioning post, the base 12 is positioned and installed on a circuit board through the positioning post, the upper cover 13 includes a guiding slide hole 91 for allowing the button structure 6 to slide vertically, and a guide post structure 9 formed on the top surface of the upper cover 13 along the axial direction of the guiding slide hole 91, the guiding slide hole 91 penetrates through the guide post structure 9, the driving boss 61 is provided with a stopping step 63 matched and abutted with the bottom surface of the upper cover 13, according to the above structure, the button structure 6 is slidably inserted through the guide post structure 9 of the upper cover 13, the elastic pressing movement of the button structure 6 by the guide post structure 9 plays a guiding role, so as to avoid the position deviation of the button structure 6, and the resisting step 63 is used for limiting the button structure 6 to be separated from the guide pillar structure 9 in the elastic resetting process, so that the reliability of the button structure 6 in pressing the elastic trigger foot 51 is ensured.

As a preferred embodiment, the connecting structure includes two hanging buckle plates 7 disposed at two ends of the upper cover 13 and attached to the sidewall of the base 12, and two clamping platforms 71 correspondingly disposed on the sidewall of the base 12, and the hanging buckle plates 7 are provided with buckling holes forming a buckling fit with the clamping platforms 71, so that the upper cover 13 and the base 12 are fixedly connected through the buckling fit of the two hanging buckle plates 7 and the two clamping platforms 71, and the mounting structure is simple and reliable in fitting and fixing, wherein the limiting pressing block 8 is formed on the bottom surface of the upper cover 13 and presses against the spring main body 50 when the upper cover 13 and the base 12 are mounted in a fitting manner, so that when the upper cover 13 and the base 12 are mounted, the upper cover 13 drives the limiting pressing block 8 to just press against the spring main body 50, thereby synchronously positioning and mounting the elastic pressing block 5 in the mounting cavity 2, the spring main body 50 is pressed oppositely by the U-shaped limiting groove 23 and the limiting pressing block 8, so that the limiting and anti-loosening effects are achieved, and the installation stability is good.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the utility model.

Claims (10)

1. A miniature reset switch, comprising:

the switch comprises a switch body (1) and a switch body, wherein the switch body is provided with an installation inner cavity (2), and a middle partition plate (11) which divides the installation inner cavity (2) into a first cavity part (21) and a second cavity part (22) is arranged in the installation inner cavity (2);

the output end assembly comprises a first contact piece (31) and a second contact piece (41) which are respectively arranged in the first cavity part (21) and the second cavity part (22), and a first terminal structure (3) and a second terminal structure (4) which are respectively arranged on two sides of the bottom of the switch body (1) in a penetrating mode, wherein the first terminal structure (3) is connected with the first contact piece (31), and the second terminal structure (4) is connected with the second contact piece (41);

the elastic conductive piece (5) is arranged between the first cavity part (21) and the second cavity part (22) and comprises an elastic triggering foot (51) and an elastic pressing foot (52) which are respectively bent and extended into the first cavity part (21) and the second cavity part (22), the elastic triggering foot (51) is arranged opposite to the first contact piece (31), and the elastic pressing foot (52) is pressed against the second contact piece (41);

button structure (6), the activity is worn to locate switch body (1) top, and its bottom stretches into installation inner chamber (2) and card are supported on elastic trigger foot (51), drive when button structure (6) are pushed down elastic trigger foot (51) take place deformation with first contact counterbalance contact.

2. A miniature reset switch as set forth in claim 1, wherein: an accommodating area suitable for mounting the elastic conductive piece (5) is arranged between the first cavity part (21) and the second cavity part (22) in a connecting mode, the elastic conductive piece (5) comprises a cylindrical spring main body (50) accommodated in the accommodating area, and an elastic trigger foot (51) and an elastic pressing foot (52) which are formed by extending two ends of the spring main body (50).

3. A miniature reset switch as set forth in claim 2, wherein: the accommodating area comprises a U-shaped limiting groove (23) formed in the middle partition plate (11), a limiting pressing block (8) opposite to the U-shaped limiting groove (23) is arranged at the top of the switch body (1), and the spring main body (50) is pressed between the U-shaped limiting groove (23) and the limiting pressing block (8).

4. A miniature reset switch according to claim 3, wherein: the elastic trigger foot (51) comprises a V-shaped connecting part (511) and a hook part (512) formed by obliquely bending one end of the V-shaped connecting part (511), and the bottom of the button structure (6) abuts against one side edge of the V-shaped connecting part (511).

5. The miniature reset switch of claim 4, wherein: the bent hook part (512) is provided with an arc end for contacting the first contact piece (31), and the elastic pressing foot (52) is arranged in an inclined shape.

6. The miniature reset switch of claim 5, wherein: the button structure (6) is long in strip shape, the bottom of the button structure is provided with a driving boss (61) which is matched and abutted with the elastic triggering foot (51), an abutting groove (62) is formed in the driving boss (61), and the V-shaped connecting portion (511) of the elastic triggering foot (51) is inserted into the abutting groove (62).

7. A miniature reset switch according to any of claims 1-6 and further comprising: the first contact piece (31) and the second contact piece (41) are respectively arranged on the bottom surfaces of the first cavity part (21) and the first cavity part (21) in a strip shape in a left-right staggered manner; the first terminal structure (3) and the second terminal structure (4) respectively comprise a pair of Z-shaped terminal pins extending out of two sides of the bottom of the switch body.

8. A miniature reset switch according to claim 6, wherein: the switch body comprises a base (12) provided with the installation inner cavity (2) and an upper cover (13) fixed on the base (12) through a connecting structure, a positioning column is arranged at the bottom of the base (12), the upper cover (13) comprises a guide sliding hole (91) allowing the button structure (6) to vertically slide and a guide pillar structure (9) formed on the top surface of the upper cover (13) along the axial direction of the guide sliding hole (91), the guide sliding hole (91) penetrates through the guide pillar structure (9), and a blocking step (63) matched and abutted to the bottom surface of the upper cover (13) is arranged on the driving boss (61).

9. A miniature reset switch according to claim 8, wherein: the limiting pressing block (8) is formed on the bottom surface of the upper cover (13) and abuts against the spring main body (50) when the upper cover (13) and the base (12) are installed in a matched mode.

10. A miniature reset switch according to claim 8, wherein: the connecting structure comprises two hanging buckle plates (7) which are arranged at two ends of the upper cover (13) and attached to the side wall of the base (12), and two clamping platforms (71) which are correspondingly arranged on the side wall of the base (12), wherein clamping holes matched with the clamping platforms (71) in a clamping mode are formed in the hanging buckle plates (7).

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