Auxiliary contact device

Abstract

The utility model belongs to the technical field of low-voltage switching devices, and discloses an auxiliary contact device. The auxiliary contact device comprises a shell, a first wiring assembly, a second wiring assembly and an ejector rod assembly, the first wiring assembly is arranged in the shell, and the first wiring assembly comprises a normally open contact group; the second wiring assembly is arranged in the shell and comprises a normally closed contact group; the ejector rod assembly comprises a first ejector rod, a second ejector rod and an elastic piece, the first ejector rod is arranged in the shell in a sliding mode in the first direction, the second ejector rod is arranged on the first ejector rod in a sliding mode in the first direction, the second ejector rod is connected with the first ejector rod through the elastic piece in the first direction, and the second ejector rod is used for being connected with main equipment; the first push rod is connected with the normally open contact group and the normally closed contact group. The first push rod can move along a first direction to close the normally open contact group and open the normally closed contact group. The auxiliary contact device can absorb the overtravel difference of the main body equipment, and is high in practicability and wide in application range.

Description

Technical Field

[0001] The utility model relates to the technical field of low-voltage switch appliances, in particular to an auxiliary contact device. Background Art

[0002] Auxiliary contacts are usually installed on electrical equipment such as contactors, circuit breakers, and air switches. The auxiliary contacts can increase the number of auxiliary contacts or provide additional control functions; the auxiliary contacts and the above-mentioned electrical equipment together complete the on-off operation of the circuit. Most of the existing auxiliary contacts drive the ejector rod to move through the main equipment to realize the closing and opening operations of the internal contacts of the auxiliary contacts. However, for main equipment of different specifications, the ejector rod of the auxiliary contact cannot meet different stroke requirements, resulting in the inability of the auxiliary contact to be applicable to different main equipment, thus affecting the practicability of the auxiliary contact. Content of the Utility Model

[0003] The purpose of the utility model is to provide an auxiliary contact device, which has a simple structure, can be applicable to main equipment of different specifications, and has strong practicability.

[0004] To achieve the above object, the utility model adopts the following technical solutions:

[0005] The utility model provides an auxiliary contact device, including:

[0006] A housing;

[0007] A first wiring component, arranged in the housing, and the first wiring component includes a normally open contact group;

[0008] A second wiring component, arranged in the housing, and the second wiring component includes a normally closed contact group;

[0009] An ejector rod assembly, including a first ejector rod, a second ejector rod, and an elastic member. The first ejector rod is slidably arranged in the housing along a first direction. The second ejector rod is slidably arranged on the first ejector rod along the first direction, and the second ejector rod is connected to the first ejector rod through the elastic member in the first direction. The second ejector rod is used to connect with the main equipment. The first ejector rod is respectively connected to the normally open contact group and the normally closed contact group. The first ejector rod can move along the first direction to close the normally open contact group and open the normally closed contact group.

[0010] Preferably, the normally open contact group includes a first contact plate, a second contact plate and a first connecting piece. The first wiring assembly further includes two first wiring terminals. One end of the first contact plate is connected to one of the first wiring terminals, and a first moving contact is provided at the other end of the first contact plate. One end of the second contact plate is connected to the other first wiring terminal, the other end of the second contact plate is connected to one end of the first connecting piece, and a first static contact corresponding to the first moving contact is provided at the other end of the first connecting piece;

[0011] The normally closed contact group includes a third contact plate, a fourth contact plate and a second connecting piece. The second wiring assembly further includes two second wiring terminals. One end of the third contact plate is connected to one of the second wiring terminals, and a second moving contact is provided at the other end of the third contact plate. One end of the fourth contact plate is connected to the other second wiring terminal, the other end of the fourth contact plate is connected to one end of the second connecting piece, and a second static contact corresponding to the second moving contact is provided at the other end of the second connecting piece.

[0012] Preferably, the housing includes a first housing and a second housing. Four mounting grooves for respectively accommodating the first contact plate, the second contact plate, the third contact plate and the fourth contact plate are provided on the second housing. The first contact plate, the second contact plate, the third contact plate and the fourth contact plate all have bending rounded corners, and a filling block is provided in each mounting groove opposite to the bending rounded corner, and the filling block abuts against the bending rounded corner;

[0013] The first housing covers the normally open contact group and the normally closed contact group, and the first housing is detachably connected to the second housing.

[0014] Preferably, protrusions are provided on the first contact plate, the second contact plate, the third contact plate and the fourth contact plate. There is a vertical limiting groove between the protrusions and the side wall of the mounting groove. A stop block matching the limiting groove is provided on the first housing, and the stop block is clamped in the limiting groove.

[0015] Preferably, a positioning plate is provided on the second housing, a jack is provided on the first housing, the positioning plate is inserted into the jack in a matching manner, and the positioning plate extends out of the surface of the first housing.

[0016] Preferably, a first partition plate and a second partition plate are provided on the second housing. The first partition plate is arranged between the first wiring terminal and the first connecting piece, and the second partition plate is arranged between the second wiring terminal and the second contact plate.

[0017] Preferably, two limiting walls extending along the first direction are provided on the outer shell, and a ejector rod sliding groove is formed between the two limiting walls, and the first ejector rod is slidably arranged in the ejector rod sliding groove.

[0018] Preferably, the limiting wall has an inner wall surface which is in sliding fit with the first ejector rod, and an avoidance inclined surface is arranged at the end of the inner wall surface.

[0019] Preferably, the surface of the limiting wall opposite to the inner wall surface is an outer wall surface, and a reinforcing rib is arranged at the end of the outer wall surface.

[0020] Preferably, the first ejector rod includes an ejector rod body, a first supporting arm and a second supporting arm. The first supporting arm and the second supporting arm are both connected to the ejector rod body. The ejector rod body is slidably arranged in the ejector rod sliding groove. The elastic member is arranged in the ejector rod body. The second ejector rod is arranged in the ejector rod body along the first direction. Two ends of the elastic member are respectively abutted against the ejector rod body and the second ejector rod;

[0021] The first supporting arm is elastically abutted against the normally open contact group, and the second supporting arm is elastically abutted against the normally closed contact group.

[0022] The beneficial effects of the utility model are as follows:

[0023] For the auxiliary contact device provided by the utility model, a first wiring component and a second wiring component are arranged in the outer shell. The first wiring component includes a normally open contact group, and the second wiring component includes a normally closed contact group; Since the second ejector rod is connected to the main device, and the first ejector rod is respectively connected to the normally open contact group and the normally closed contact group. When the main device acts to drive the second ejector rod to approach the outer shell along the first direction, the second ejector rod drives the first ejector rod to move through the elastic member, thereby driving the normally open contact group to close and the normally closed contact group to open. At this time, the main device is in a closed state; Since an elastic member is arranged between the first ejector rod and the second ejector rod, when the second ejector rod moves under the drive of the main device, the second ejector rod will drive the first ejector rod to move along the first direction through the elastic member to drive the normally open contact group and the normally closed contact group to act, and the elastic member can absorb the overtravel difference of the main device, so that the ejector rod assembly can realize the state switching of the normally open contact group and the normally closed contact group under the action strokes of different main devices, so that different specifications of main devices can be smoothly switched to the closed state, thereby improving the practicability and application range of the auxiliary contact device. Description of the Drawings

[0024] Figure 1 is an axonometric view of the auxiliary contact device provided by the specific embodiment of the utility model;

[0025] Figure 2It is a cross-sectional view of the ejector rod assembly provided by the specific embodiment of the present utility model;

[0026] Figure 3 It is a top view of the internal structure of the auxiliary contact device provided by the specific embodiment of the present utility model;

[0027] Figure 4 It is a first perspective disassembly structure diagram of the auxiliary contact device provided by the specific embodiment of the present utility model;

[0028] Figure 5 It is a second perspective disassembly structure diagram of the auxiliary contact device provided by the specific embodiment of the present utility model.

[0029] In the figure:

[0030] 1 - Housing; 11 - First housing; 111 - Stopper; 112 - Jack; 12 - Second housing; 121 - Filling block; 122 - Positioning plate; 123 - First sealing partition; 124 - Second sealing partition; 125 - Limiting wall;

[0031] 2 - First wiring assembly; 21 - First contact plate; 211 - Protrusion; 22 - Second contact plate; 23 - First connecting piece; 24 - First wiring terminal; 241 - First wiring screw; 242 - First wiring nut; 243 - First fixing gasket; 25 - First static contact;

[0032] 3 - Second wiring assembly; 31 - Third contact plate; 32 - Fourth connecting piece; 33 - Second connecting piece; 34 - Second wiring terminal; 341 - Second wiring screw; 342 - Second wiring nut; 343 - Second fixing gasket; 35 - Second static contact;

[0033] 4 - Ejector rod assembly; 41 - First ejector rod; 411 - Ejector rod body; 412 - First supporting arm; 413 - Second supporting arm; 42 - Second ejector rod; 43 - Elastic member. Specific Embodiment

[0034] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. Additionally, it should be noted that for the sake of description, only the parts related to the present utility model are shown in the drawings, rather than all the structures.

[0035] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0036] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over", and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath", and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0037] In the description of this embodiment, the orientation or positional relationships such as "upper", "lower", "right", and "left" are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operation, 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 thus should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and do not have special meanings.

[0038] Such as Figures 1 to 3As shown in the figure, the present utility model provides an auxiliary contact device, which includes a housing 1, a first wiring component 2, a second wiring component 3, and a push rod component 4. The first wiring component 2 is arranged inside the housing 1, and the first wiring component 2 includes a normally open contact group; the second wiring component 3 is arranged inside the housing 1, and the second wiring component 3 includes a normally closed contact group; the push rod component 4 includes a first push rod 41, a second push rod 42, and an elastic member 43. The first push rod 41 is slidably arranged in the housing 1 along a first direction, the second push rod 42 is slidably arranged on the first push rod 41 along the first direction, and the second push rod 42 is connected to the first push rod 41 through the elastic member 43 in the first direction. The second push rod 42 is used to connect to the main device, the first push rod 41 is respectively connected to the normally open contact group and the normally closed contact group, and the first push rod 41 can move along the first direction to close the normally open contact group and open the normally closed contact group. In this embodiment, the first wiring component 2 and the second wiring component 3 are arranged inside the housing 1. The first wiring component 2 includes a normally open contact group, and the second wiring component 3 includes a normally closed contact group; since the second push rod 42 is connected to the main device and the first push rod 41 is respectively connected to the normally open contact group and the normally closed contact group, when the main device moves to drive the second push rod 42 to approach the housing 1 along the first direction, the second push rod 42 drives the first push rod 41 to move through the elastic member 43, thereby driving the normally open contact group to close and the normally closed contact group to open. At this time, the main device is in a closed state; since the elastic member 43 is arranged between the first push rod 41 and the second push rod 42, when the second push rod 42 moves under the drive of the main device, the second push rod 42 will drive the first push rod 41 to move along the first direction through the elastic member 43 to drive the normally open contact group and the normally closed contact group to act, and the elastic member 43 can absorb the over-travel difference of the main device, so that the push rod component 4 can realize the state switching of the normally open contact group and the normally closed contact group under the action strokes of different main devices, so that different specifications of main devices can be smoothly switched to the closed state, thereby improving the practicability and application range of the auxiliary contact device. Specifically, the auxiliary contact device is installed on the main product and used in cooperation with the main product, and its function is to increase the number of auxiliary contacts or provide additional control functions. The main product is a commonly used device such as a contactor or a circuit breaker in this field.

[0039] Further, as Figure 3 and Figure 4As shown, the normally open contact group includes a first contact plate 21, a second contact plate 22 and a first connecting piece 23. The first wiring assembly 2 further includes two first wiring terminals 24. One end of the first contact plate 21 is connected to one of the first wiring terminals 24, and a first moving contact is provided at the other end of the first contact plate 21. One end of the second contact plate 22 is connected to the other first wiring terminal 24, the other end of the second contact plate 22 is connected to one end of the first connecting piece 23, and a first static contact 25 corresponding to the first moving contact is provided at the other end of the first connecting piece 23; the normally closed contact group includes a third contact plate 31, a fourth contact plate 32 and a second connecting piece 33. The second wiring assembly 3 further includes two second wiring terminals 34. One end of the third contact plate 31 is connected to one of the second wiring terminals 34, and a second moving contact is provided at the other end of the third contact plate 31. One end of the fourth contact plate 32 is connected to the other second wiring terminal 34, the other end of the fourth contact plate 32 is connected to one end of the second connecting piece 33, and a second static contact 35 corresponding to the second moving contact is provided at the other end of the second connecting piece 33. In this embodiment, the first wiring terminal 24 is a commonly used wiring device in the art, which includes a first wiring screw 241, a first wiring nut 242 and a first fixing gasket 243. The first wiring nut 242 is placed in the housing 1, and both the first fixing gasket 243 and the end of the first contact plate 21 are passed through the first wiring screw 241, and the first wiring screw 241 is screwed with the first wiring nut 242, and the external wire is pressed between the first fixing gasket 243 and the first contact plate 21. Tightening the first wiring screw 241 on the first wiring nut 242 can fix the external wire; similarly, the second wiring terminal 34 includes a second wiring screw 341, a second wiring nut 342 and a second fixing gasket 343. Both the second fixing gasket 343 and the end of the third contact plate 31 are passed through the second wiring screw 341, and the external wire is clamped between the second fixing gasket 343 and the third contact plate 31. By tightening the second wiring screw 341, the external wire can be fixed. Specifically, both the first connecting piece 23 and the second connecting piece 33 are leaf spring structures made of conductive metal with a certain elasticity, and the first connecting piece 23 and the second connecting piece 33 are always elastically abutted against the first ejector rod 41 along the first direction respectively.

[0040] Specifically, as Figure 3 and Figure 4As shown, the outer shell 1 includes a first housing 11 and a second housing 12. Four mounting grooves are provided on the second housing 12 for accommodating a first contact plate 21, a second contact plate 22, a third contact plate 31, and a fourth contact plate 32 respectively. The first contact plate 21, the second contact plate 22, the third contact plate 31, and the fourth contact plate 32 all have bending rounded corners. Filling blocks 121 are provided opposite to the bending rounded corners in each mounting groove, and the filling blocks 121 are in contact with the bending rounded corners. The first housing 11 covers the normally open contact group and the normally closed contact group, and the first housing 11 is detachably connected to the second housing 12. In this embodiment, the first contact plate 21, the second contact plate 22, the third contact plate 31, and the fourth contact plate 32 all have bending rounded corners, so as to improve their own structural strength. Filling blocks 121 with a triangular cross-section are provided opposite to the bending rounded corners in the mounting grooves, and the filling blocks 121 are in contact with the bending rounded corners, which are used to prevent external wires from leaking into the gap between the bending rounded corners and the second housing 12, thus avoiding the situation that the second housing becomes bulged and deformed due to the wires being stressed and accidentally squeezing it. Specifically, the first housing 11 covers the second housing 12, and the two are connected by buckles, with a simple structure and convenient disassembly and assembly.

[0041] Specifically, as Figure 4 and Figure 5 shown, convex portions 211 are provided on the first contact plate 21, the second contact plate 22, the third contact plate 31, and the fourth contact plate 32. There are vertical limiting grooves between the convex portions 211 and the side walls of the mounting grooves. Stopping blocks 111 matching the limiting grooves are provided on the first housing 11, and the stopping blocks 111 are clamped in the limiting grooves. In this embodiment, convex portions 211 protrude vertically on the first contact plate 21, the second contact plate 22, the third contact plate 31, and the fourth contact plate 32. There are vertical limiting grooves between the convex portions 211 and the side walls of the mounting grooves. Four stopping blocks 111 are provided on the first housing 11, and the four stopping blocks 111 correspond to the four limiting grooves one by one. After the first housing 11 is installed on the second housing 12, the four stopping blocks 111 are respectively inserted into the four limiting grooves to play a limiting role on the convex portions 211, preventing the first wiring screw 241 and the second wiring screw 341 from driving the four contact plates to rotate during screwing, resulting in poor contact of the external wires.

[0042] Specifically, as Figure 1 and Figure 4As shown, the second housing 12 is provided with a positioning plate 122, and the first housing 11 is provided with an insertion hole 112. The positioning plate 122 is inserted into the insertion hole 112 in a matching manner, and the positioning plate 122 extends out of the surface of the first housing 11. In this embodiment, the positioning plate 122 is vertically provided on the second housing 12, and the insertion hole 112 is provided on the first housing 11 at a position and shape corresponding to the positioning plate 122. When the first housing 11 and the second housing 12 are assembled, the positioning plate 122 can pass through the insertion hole 112, thereby locating the assembly of the first housing 11 and the second housing 12, thereby improving installation efficiency.

[0043] Specifically, if Figure 3 and Figure 4 As shown, the second housing 12 is provided with a first barrier plate 123 and a second barrier plate 124. The first barrier plate 123 is disposed between the first terminal 24 and the first connecting piece 23, while the second barrier plate 124 is disposed between the second terminal 34 and the second contact plate 22. In this embodiment, the first barrier plate 123 is disposed between the first terminal 24 and the first connecting piece 23, thereby isolating the first terminal 24 and the first connecting piece 23, thereby preventing metal dust generated during the tightening of the first connecting screw 241 from contaminating the first stationary contact 25 on the first connecting piece 23. Similarly, the second barrier plate 124 prevents metal dust generated during the tightening of the second connecting screw 341 from contaminating the second stationary contact 35 on the second connecting piece 33.

[0044] Furthermore, if Figure 3 and Figure 4 As shown, the housing 1 is provided with two limiting walls 125 extending in a first direction. A push rod slot is formed between the two limiting walls 125, and the first push rod 41 is slidably disposed in the push rod slot. In this embodiment, the two limiting walls 125 are provided parallel to the second housing 12, thereby forming a push rod slot extending in the first direction on the second housing 12. The first push rod 41 is disposed in the push rod slot, thereby enabling the first push rod 41 to move in the first direction.

[0045] Specifically, if Figure 3 As shown, the limiting wall 125 has an inner wall surface that slidably engages the first push rod 41, and the end of the inner wall surface is provided with an escape slope. In this embodiment, the inner wall surfaces of both limiting walls 125 are provided with an escape slope, thereby forming a wedge-shaped escape structure at the end of the limiting wall 125. This prevents the first terminal 24 and the second terminal 34 from squeezing the limiting wall 121 when securing the wire, which would cause the first push rod 41 to slide smoothly within the limiting chute.

[0046] Specifically, the side of the limiting wall 125 facing away from the inner wall surface is the outer wall surface, and reinforcing ribs are provided at the end of the outer wall surface. In this embodiment, the reinforcing ribs are provided on the outer wall surface, which improves the structural strength and anti-deformation ability of the end of the limiting wall 121, thereby preventing the limiting wall 125 from being damaged due to deformation when subjected to an external force.

[0047] Specifically, as Figure 2 and Figure 3 shown, the first ejector rod 41 includes an ejector rod body 411, a first support arm 412, and a second support arm 413. The first support arm 412 and the second support arm 413 are both connected to the ejector rod body 411. The ejector rod body 411 is slidably arranged in the ejector rod chute. The elastic member 43 is arranged inside the ejector rod body 411. The second ejector rod 42 is arranged in the ejector rod body 411 along a first direction. The two ends of the elastic member 43 are respectively abutted against the ejector rod body 411 and the second ejector rod 42. The first support arm 412 is elastically abutted against the normally open contact group, and the second support arm 413 is elastically abutted against the normally closed contact group. In this embodiment, the ejector rod body 411 is of a cuboid tubular structure. The first support arm 412 and the second support arm 413 have the same structure and are symmetrically arranged on both sides of the ejector rod body 411. The elastic member 43 is a compression spring. The elastic member 43 is placed in the ejector rod body 411. The second ejector rod 42 is slidably arranged in the ejector rod body 411. The two ends of the elastic member 43 are respectively abutted against the ejector rod body 411 and the second ejector rod 42. When the second ejector rod 42 approaches the housing 1 along the first direction, the first ejector rod 41 can be driven to move along the first direction in the ejector rod chute through the elastic member 43. When the first ejector rod 41 moves to the end of the ejector rod chute and abuts against the chute wall, the elastic member 43 undergoes elastic deformation by being compressed to absorb the stroke differences of different specifications of the main equipment, so that the second ejector rod 42 can continue to approach the housing 1 along the first direction.

[0048] Obviously, the above embodiments of the present invention are merely examples for clearly explaining the present invention, and are not intended to limit the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments, and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. Auxiliary contact device, characterized in that, Comprising: A housing (1); A first wiring component (2), arranged inside the housing (1), the first wiring component (2) comprising a normally open contact group; A second wiring component (3), arranged inside the housing (1), the second wiring component (3) comprising a normally closed contact group; A push rod assembly (4), including a first push rod (41), a second push rod (42) and an elastic member (43), the first push rod (41) is slidably arranged inside the housing (1) along a first direction, the second push rod (42) is slidably arranged on the first push rod (41) along the first direction, and the second push rod (42) is connected to the first push rod (41) by the elastic member (43) in the first direction. The second push rod (42) is used to connect to a main device, the first push rod (41) is respectively connected to the normally open contact group and the normally closed contact group, and the first push rod (41) can move along the first direction to close the normally open contact group and open the normally closed contact group.

2. The auxiliary contact device according to claim 1, wherein the normally open contact group comprises a first contact plate (21), a second contact plate (22) and a first connecting piece (23), the first wiring component (2) further comprises two first wiring terminals (24), one end of the first contact plate (21) is connected to one of the first wiring terminals (24), the other end of the first contact plate (21) is provided with a first moving contact, one end of the second contact plate (22) is connected to the other first wiring terminal (24), the other end of the second contact plate (22) is connected to one end of the first connecting piece (23), and the other end of the first connecting piece (23) is provided with a first static contact (25) corresponding to the first moving contact; The normally closed contact group comprises a third contact plate (31), a fourth contact plate (32) and a second connecting piece (33), the second wiring component (3) further comprises two second wiring terminals (34), one end of the third contact plate (31) is connected to one of the second wiring terminals (34), the other end of the third contact plate (31) is provided with a second moving contact, one end of the fourth contact plate (32) is connected to the other second wiring terminal (34), the other end of the fourth contact plate (32) is connected to one end of the second connecting piece (33), and the other end of the second connecting piece (33) is provided with a second static contact (35) corresponding to the second moving contact.

3. The auxiliary contact device according to claim 2, characterized in that, The housing (1) includes a first housing body (11) and a second housing body (12). Four mounting grooves are provided on the second housing body (12) for accommodating the first contact plate (21), the second contact plate (22), the third contact plate (31), and the fourth contact plate (32) respectively. The first contact plate (21), the second contact plate (22), the third contact plate (31), and the fourth contact plate (32) all have bending rounded corners. A filling block (121) is provided in each mounting groove opposite to the bending rounded corner, and the filling block (121) abuts against the bending rounded corner. The first housing body (11) covers the normally open contact group and the normally closed contact group, and the first housing body (11) is detachably connected to the second housing body (12).

4. The auxiliary contact device according to claim 3, characterized in that, Protrusions (211) are provided on the first contact plate (21), the second contact plate (22), the third contact plate (31), and the fourth contact plate (32). There is a vertical limiting groove between the protrusions (211) and the side wall of the mounting groove. A stop block (111) matching the limiting groove is provided on the first housing body (11), and the stop block (111) is clamped in the limiting groove.

5. The auxiliary contact device according to claim 3, characterized in that A positioning plate (122) is provided on the second housing body (12). A jack (112) is provided on the first housing body (11). The positioning plate (122) is inserted into the jack (112) in a matching manner, and the positioning plate (122) extends out of the surface of the first housing body (11).

6. The auxiliary contact device according to claim 3, characterized in that A first partition plate (123) and a second partition plate (124) are provided on the second housing body (12). The first partition plate (123) is arranged between the first terminal (24) and the first connecting piece (23), and the second partition plate (124) is arranged between the second terminal (34) and the second contact plate (22).

7. The auxiliary contact device according to claim 1, characterized in that, Two limiting walls (125) extending along the first direction are provided on the housing (1). A push rod sliding groove is formed between the two limiting walls (125), and the first push rod (41) is slidably arranged in the push rod sliding groove.

8. The auxiliary contact device according to claim 7, characterized in that, The limiting wall (125) has an inner wall surface which is slidably matched with the first push rod (41), and an avoidance inclined surface is provided at the end of the inner wall surface.

9. The auxiliary contact device according to claim 8, characterized in that, The surface of the limiting wall (125) opposite to the inner wall surface is an outer wall surface, and a reinforcing rib is provided at the end of the outer wall surface.

10. The auxiliary contact device according to claim 7, characterized in that, The first ejector rod (41) includes an ejector rod body (411), a first support arm (412) and a second support arm (413). The first support arm (412) and the second support arm (413) are both connected to the ejector rod body (411). The ejector rod body (411) is slidably disposed in the ejector rod chute. The elastic member (43) is disposed inside the ejector rod body (411). The second ejector rod (42) is disposed through the ejector rod body (411) along the first direction. Two ends of the elastic member (43) are respectively abutted against the ejector rod body (411) and the second ejector rod (42). The first support arm (412) is elastically abutted against the normally open contact group, and the second support arm (413) is elastically abutted against the normally closed contact group.

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