Connecting structure of auxiliary moving contact of direct current contactor and direct current contactor

Abstract

The utility model discloses a connection structure of an auxiliary moving contact of a direct current contactor and the direct current contactor, and relates to the technical field of electric appliance switches. The connecting structure of the auxiliary moving contact of the direct current contactor comprises an insulating base and a fixing support, the insulating base is used for being fixedly connected with the auxiliary moving contact of the direct current contactor, the fixing support is used for being fixedly connected with a mounting base of the direct current contactor, a first clamping part is arranged on the insulating base, and a second clamping part is arranged on the fixing support. And the second clamping part is clamped with the first clamping part, so that the fixed bracket is clamped with the insulating base. The connecting structure of the auxiliary moving contact of the direct current contactor can solve the problem that in the prior art, riveting can only be conducted on the side, away from the auxiliary moving contact, of the insulating base, and consequently the auxiliary moving contact assembly is prone to upwarp.

Description

Technical Field

[0001] This application relates to the field of electrical switch technology, and more specifically, to a connection structure for an auxiliary moving contact of a DC contactor and a DC contactor. Background Technology

[0002] A DC contactor, as a type of contactor used in DC circuits, is mainly used to control DC circuits, such as main circuits, control circuits, and excitation circuits.

[0003] In the prior art, the auxiliary moving contact assembly of a DC contactor is generally integrally formed with a low-voltage auxiliary moving contact using ordinary insulating material, so as to electrically isolate the low-voltage auxiliary moving contact from high-voltage components (such as magnetic top plate, moving terminal, magnetic bottom plate, and spring).

[0004] When assembling the auxiliary moving contact assembly, the insulating base made of insulating material is usually directly riveted to the fixed bracket of the DC contactor using rivets. In actual operation, in order to avoid the auxiliary moving contact, the rivet can only be made on the side of the insulating base away from the auxiliary moving contact. This causes the auxiliary moving contact assembly to be prone to tilting, resulting in poor process operability and easy to cause the auxiliary opening distance to exceed the range, thus degrading its performance during use. Utility Model Content

[0005] The purpose of this application is to provide a connection structure for the auxiliary moving contact of a DC contactor and a DC contactor, which can solve the problem in the prior art that the auxiliary moving contact assembly is prone to lifting due to the fact that it can only be riveted on the side of the insulating base away from the auxiliary moving contact.

[0006] The embodiments of this application are implemented as follows:

[0007] A first aspect of this application provides a connection structure for an auxiliary moving contact of a DC contactor, including an insulating base and a fixing bracket. The insulating base is used for fixed connection with the auxiliary moving contact of the DC contactor, and the fixing bracket is used for fixed connection with a mounting base of the DC contactor. The insulating base is provided with a first snap-fit ​​portion, and the fixing bracket is provided with a second snap-fit ​​portion. The second snap-fit ​​portion and the first snap-fit ​​portion snap together to engage the fixing bracket and the insulating base. This connection structure for the auxiliary moving contact of the DC contactor solves the problem in the prior art where riveting can only be done on the side of the insulating base away from the auxiliary moving contact, which easily leads to the lifting behavior of the auxiliary moving contact assembly.

[0008] As one possible implementation, it also includes fasteners. The insulating base has a mounting hole on the side away from the suspended end of the auxiliary moving contact, and the fixed bracket has a connecting hole. The fasteners pass through the connecting hole and the mounting hole to fix the fixed bracket and the insulating base together.

[0009] In one possible implementation, the first snap-fit ​​portion is a U-shaped slot extending outward from the insulating base, and the second snap-fit ​​portion is a plate-shaped protrusion extending outward from the fixed bracket. The plate-shaped protrusion is snapped into the U-shaped slot so that the second snap-fit ​​portion and the first snap-fit ​​portion snap together.

[0010] In one possible implementation, the insulating base includes a first insulating base and a second insulating base stacked together, the first end of the auxiliary moving contact is fixedly disposed on the first insulating base and the second end is suspended on the first insulating base, and the U-shaped slot is formed on the second insulating base.

[0011] In one possible implementation, the first insulating base includes two first sidewalls disposed opposite to each other and a connecting wall fixedly connected between the two first sidewalls. The first end of the auxiliary moving contact is fixedly disposed inside the connecting wall, and the second end extends toward the side away from the connecting wall and is suspended.

[0012] In one possible implementation, the second insulating base includes a top wall fixedly connected to the bottom of the first insulating base and a limiting wall fixedly connected to the side of the top wall near the second end of the auxiliary moving contact. The U-shaped groove is formed on the top wall, and the limiting wall is used to cooperate with the fixed bracket to limit the sliding insertion of the plate-shaped protrusion into the U-shaped groove through the opening of the U-shaped groove.

[0013] In one possible implementation, the fixed bracket includes two opposing second sidewalls and a cover plate fixedly connected above the two second sidewalls. The second sidewalls are used to be fixedly connected to the mounting base. The second sidewall on the side closer to the second end of the auxiliary moving contact is also used to cooperate with the limiting wall to limit the sliding stroke of the plate-shaped rib. The cover plate is used to separate the top wall and the magnetic top plate of the DC contactor. The plate-shaped rib is formed on the cover plate.

[0014] In one possible implementation, there are two first latching parts and two second latching parts. The two first latching parts are respectively disposed on opposite sides of the insulating base, and the two second latching parts are respectively disposed on opposite sides of the fixed bracket. The two second latching parts are latched into the two first latching parts in a one-to-one correspondence.

[0015] A second aspect of this application provides a DC contactor, including a mounting base, a moving terminal, a stationary terminal cooperating with the moving terminal, an auxiliary moving contact, an auxiliary stationary contact cooperating with the auxiliary moving contact, and a connection structure for the auxiliary moving contact described above. The moving terminal is floatingly mounted within the mounting base, and the auxiliary moving contact is fixedly connected to the mounting base via the connection structure, with the auxiliary moving contact located on one side of the moving terminal. This connection structure for the auxiliary moving contact of the DC contactor solves the problem in the prior art where riveting can only be done on the side of the insulating base away from the auxiliary moving contact, leading to the auxiliary moving contact assembly being prone to warping.

[0016] As one possible implementation, it also includes a magnetic yoke plate located below the mounting base, and a coil frame and a circuit board located within the magnetic yoke plate, with the circuit board located between the magnetic yoke plate and the coil frame.

[0017] The beneficial effects of the embodiments of this application include:

[0018] The connection structure of the auxiliary moving contact of the DC contactor includes an insulating base and a fixed bracket. The insulating base is used for fixed connection with the auxiliary moving contact of the DC contactor, and the fixed bracket is used for fixed connection with the mounting base of the DC contactor. The insulating base is provided with a first snap-fit ​​part, and the fixed bracket is provided with a second snap-fit ​​part. The second snap-fit ​​part and the first snap-fit ​​part snap together to lock the fixed bracket and the insulating base. The connection structure provided in this application adopts a snap-fit ​​method, which, compared with traditional riveting, can more evenly distribute the force borne by the connection part and avoid stress concentration caused by riveting on only one side. This makes the installation of the auxiliary moving contact assembly more stable, effectively reduces the occurrence of tilting behavior, and thus improves the stability and reliability of the operation of the auxiliary moving contact of the DC contactor, ensuring the normal performance of the overall DC contactor. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the connection structure of the auxiliary moving contact of the DC contactor provided in the embodiments of this application;

[0021] Figure 2 An exploded view of the connection structure of the auxiliary moving contact of the DC contactor provided in the embodiments of this application;

[0022] Figure 3A cross-sectional schematic diagram of the connection structure of the auxiliary moving contact of the DC contactor provided in the embodiments of this application;

[0023] Figure 4 This is a schematic diagram of the structure of a DC contactor provided in an embodiment of this application.

[0024] Icons: 10-Mounting base; 20-Moving terminal; 30-Auxiliary moving contact; 40-Magnetic top plate; 50-Insulating base; 51-First insulating seat; 511-First side wall; 512-Connecting wall; 52-Second insulating seat; 521-Top wall; 5211-U-shaped slot; 5212-Mounting hole; 522-Limiting wall; 60-Fixing bracket; 61-Second side wall; 62-Cover plate; 621-Plate-shaped rib; 70-Fastener; 80-Magnetic bottom plate; 90-Stationary terminal; 100-Auxiliary stationary contact; 110-Magnetic yoke plate; 120-Coil frame; 130-Circuit board. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0027] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0028] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0029] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," not that the structure must be completely horizontal, but can be slightly tilted.

[0030] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0031] Please refer to the reference. Figure 1 and Figure 2 This application provides a connection structure for an auxiliary moving contact of a DC contactor, including an insulating base 50 and a fixing bracket 60. The insulating base 50 is used to fixably connect to the auxiliary moving contact 30 of the DC contactor, and the fixing bracket 60 is used to fixably connect to the mounting base 10 of the DC contactor. The insulating base 50 is provided with a first snap-fit ​​portion, and the fixing bracket 60 is provided with a second snap-fit ​​portion. The second snap-fit ​​portion and the first snap-fit ​​portion snap together to make the fixing bracket 60 and the insulating base 50 snap together. This connection structure for the auxiliary moving contact of the DC contactor can solve the problem in the prior art that the auxiliary moving contact 30 assembly is prone to warping due to the fact that it can only be riveted on the side of the insulating base 50 away from the auxiliary moving contact 30.

[0032] It should be noted that, as Figure 1 and Figure 2 As shown, this application provides a connection structure for an auxiliary moving contact 30 of a DC contactor, including an insulating base 50. The insulating base 50 is used to fix the auxiliary moving contact 30 of the DC contactor. For example, the insulating base 50 is made of plastic. In actual manufacturing, the insulating base 50 and the auxiliary moving contact 30 can be made by injection molding, so that the insulating base 50 can simultaneously fix and insulate the auxiliary moving contact 30.

[0033] In addition, the connection structure of the auxiliary moving contact 30 of the DC contactor also includes a fixed bracket 60. The fixed bracket 60 is used to fix the DC contactor to the mounting base 10. Those skilled in the art should understand that the fixed bracket 60 and the mounting base 10 can form a mounting frame for accommodating the high-voltage components of the DC contactor (such as the magnetic top plate 40, the moving terminal 20, the magnetic bottom plate 80, and the spring). The moving terminal 20 is movably disposed in the mounting frame to make electrical contact with the stationary terminal 90.

[0034] Based on this, a first snap-fit ​​part is provided on the insulating base 50, and a second snap-fit ​​part is provided on the fixed bracket 60 corresponding to the first snap-fit ​​part. The second snap-fit ​​part and the first snap-fit ​​part snap-fit ​​each other to make the fixed bracket 60 and the insulating base 50 snap-fit ​​each other, so that the auxiliary moving contact 30 can be stably installed on the mounting frame of the DC contactor, and can also maintain electrical insulation from high voltage components.

[0035] In the prior art, in order to avoid the auxiliary moving contact 30, riveting operations are usually only performed on the side of the insulating base 50 away from the auxiliary moving contact 30. This riveting method is prone to causing the auxiliary moving contact 30 assembly (i.e., the insulating base 50 and the auxiliary moving contact 30) to warp. However, the connection structure provided in this application adopts a snap-fit ​​method, which, compared with traditional riveting, can more evenly distribute the force borne by the connection part and avoid stress concentration caused by riveting only on one side. This makes the installation of the auxiliary moving contact 30 assembly more stable, effectively reducing the occurrence of warping behavior, thereby improving the stability and reliability of the operation of the DC contactor's auxiliary moving contact 30, and ensuring the normal performance of the overall DC contactor.

[0036] As one possible implementation, the connection structure of the auxiliary moving contact 30 of the aforementioned DC contactor further includes a fastener 70. An insulating base 50 has a mounting hole 5212 on the side away from the suspended end of the auxiliary moving contact 30. A fixing bracket 60 has a connecting hole. The fastener 70 passes through the connecting hole and the mounting hole 5212 to fix the fixing bracket 60 and the insulating base 50 together. This combines snap-fit ​​and riveting, further ensuring the reliability of the auxiliary moving contact 30 assembly connection. Simultaneously, the limiting effect of the first and second snap-fit ​​portions prevents warping during riveting.

[0037] As one possible implementation method, such as Figure 1 and Figure 2As shown, in this embodiment, the first engaging portion is a U-shaped groove 5211 extending outward from the insulating base 50, and the second engaging portion is a plate-shaped protrusion 621 extending outward from the fixing bracket 60. The plate-shaped protrusion 621 is inserted into the U-shaped groove 5211 to engage the second engaging portion and the first engaging portion. Of course, in other embodiments, the first engaging portion can be a protrusion, and the second engaging portion can be a groove that mates with the protrusion. Those skilled in the art should be able to make reasonable selections and designs according to actual conditions, and no specific limitations are made here.

[0038] The depth and height of the U-shaped slot 5211 should be compatible with the width and height of the plate-shaped rib 621. Those skilled in the art should be able to make reasonable selections and designs based on actual conditions. No specific restrictions are imposed here. It is only necessary to ensure that the plate-shaped rib 621 can be smoothly inserted into the U-shaped slot 5211 so that the second snap-fit ​​part and the first snap-fit ​​part are snapped and fixed, thereby achieving a fixed connection between the fixed bracket 60 and the mounting base 10.

[0039] As one possible implementation method, such as Figure 1 and Figure 2 As shown, in this embodiment, the insulating base 50 includes a first insulating base 51 and a second insulating base 52 stacked together. The first end of the auxiliary moving contact 30 is fixedly mounted on the first insulating base 51, and the second end is suspended on the first insulating base 51. A U-shaped groove 5211 is formed on the second insulating base 52. Preferably, the tracking index of the first insulating base 51 is lower than the maximum allowable operating voltage of the DC contactor, and the tracking index of the second insulating base 52 is higher than the maximum allowable operating voltage of the DC contactor. In this way, the insulation performance of the insulating base 50 can be improved by using the first insulating base 51 and the second insulating base 52, and the fixing of the auxiliary moving contact 30 and the fixing of the fixing bracket 60 can be designed on the first insulating base 51 and the second insulating base 52 respectively to avoid mutual interference.

[0040] As one possible implementation method, please refer to [reference needed]. Figure 3 The first insulating base 51 includes two first sidewalls 511 arranged opposite to each other and a connecting wall 512 fixedly connected between the two first sidewalls 511. The first end of the auxiliary moving contact 30 is fixedly disposed in the connecting wall 512, and the second end extends toward the side away from the connecting wall 512 and is suspended to ensure that the auxiliary moving contact 30 can cooperate with the auxiliary stationary contact 100 of the DC contactor to achieve electrical contact.

[0041] As one possible implementation method, such as Figure 3As shown, in this embodiment, the second insulating base 52 includes a top wall 521 fixedly connected to the bottom of the first insulating base 51 and a limiting wall 522 fixedly connected to the side of the top wall 521 near the second end of the auxiliary moving contact 30. A U-shaped groove 5211 is formed on the top wall 521. The limiting wall 522 is used to cooperate with the fixed bracket 60 to limit the sliding insertion of the plate-shaped protrusion 621 into the U-shaped groove 5211 through the opening of the U-shaped groove 5211. Thus, the limiting wall 522 and the fixed bracket 60 work together to ensure that the operator can know that the plate is in place.

[0042] It should be understood that, in order to ensure that the limiting wall 522 can cooperate with the fixed bracket 60 to limit the sliding stroke of the plate-shaped rib 621 relative to the U-shaped groove 5211, the limiting wall 522 and the U-shaped groove 5211 should be located on adjacent sides of the top wall 521, and not on opposite sides of the top wall 521. In other words, the extending direction of the limiting wall 522 needs to be perpendicular to the sliding direction of the plate-shaped rib 621 (i.e., the extending direction of the U-shaped groove 5211), and not parallel to each other.

[0043] As one possible implementation method, such as Figure 2 As shown, the fixed bracket 60 includes two opposing second sidewalls 61 and a cover plate 62 fixedly connected to the top of the two second sidewalls 61. The second sidewalls 61 are used to be fixedly connected to the mounting base 10 so that the fixed bracket 60 can cooperate with the mounting base 10 to form a mounting frame. The second sidewall 61 on the side closer to the second end of the auxiliary moving contact 30 is also used to cooperate with the limiting wall 522 to limit the sliding stroke of the plate-shaped protrusion 621 so that the plate-shaped protrusion 621 can slide into the U-shaped slot 5211 relative to the U-shaped slot 5211 through the opening of the U-shaped slot 5211 (i.e., the side away from the second end of the auxiliary moving contact 30). The cover plate 62 is used to separate the top wall 521 and the magnetic top plate 40 of the DC contactor to ensure that the auxiliary moving contact 30 can maintain electrical insulation with the high voltage components. Corresponding to the U-shaped slot 5211 formed on the top wall 521, the plate-shaped protrusion 621 is formed on the cover plate 62.

[0044] Based on the above-mentioned snap-fit ​​method, as one possible implementation method, such as Figure 2 and Figure 3 As shown, the connection structure of the auxiliary moving contact of the DC contactor also includes a fastener 70. A mounting hole 5212 is provided on the side of the top wall 521 of the insulating base 50 away from the second end (i.e., the suspended end) of the auxiliary moving contact 30. A connection hole is provided on the fixed bracket 60. The fastener 70 passes through the connection hole and the mounting hole 5212 to fix the fixed bracket 60 and the insulating base 50 together. This combines snap-fit ​​and riveting, further ensuring the reliability of the auxiliary moving contact 30 assembly connection.

[0045] As one possible implementation method, such as Figure 1 and Figure 2 As shown, there are two first snap-fit ​​parts and two second snap-fit ​​parts. The two first snap-fit ​​parts are respectively disposed on opposite sides of the insulating base 50, and the two second snap-fit ​​parts are respectively disposed on opposite sides of the fixed bracket 60. The two second snap-fit ​​parts are snapped into the two first snap-fit ​​parts in a one-to-one correspondence, so as to improve the stability and reliability of the auxiliary moving contact 30 assembly connection.

[0046] Please refer to the reference again. Figure 4 This application also provides a DC contactor, including a mounting base 10, a moving terminal 20, a stationary terminal 90 cooperating with the moving terminal 20, an auxiliary moving contact 30, an auxiliary stationary contact 100 cooperating with the auxiliary moving contact 30, and the aforementioned connection structure for the auxiliary moving contact of the DC contactor. The moving terminal 20 is floatingly mounted between a magnetically conductive top plate 40 and a magnetically conductive bottom plate 80 within the mounting base 10. The auxiliary moving contact 30 is fixedly connected to the mounting base 10 via the connection structure, and the auxiliary moving contact 30 is located on one side of the moving terminal 20. Since the structure and beneficial effects of the connection structure for the auxiliary moving contact of the DC contactor have been described in detail in the foregoing embodiments, they will not be repeated here.

[0047] As one possible implementation method, such as Figure 4 As shown, in this embodiment, the DC contactor further includes a magnetic yoke plate 110 located below the mounting base 10, and a coil frame 120 and a circuit board 130 located within the magnetic yoke plate 110, with the circuit board 130 situated between the magnetic yoke plate 110 and the coil frame 120. For example, in this embodiment, the magnetic yoke plate 110 has a U-shaped structure, so that the magnetic yoke plate 110 cooperates with the mounting base 10 to form a receiving space for accommodating the coil frame 120 and the circuit board 130.

[0048] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

[0049] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this application will not describe the various possible combinations separately.

Claims

1. A connection structure of an auxiliary moving contact of a DC contactor, characterized by, The utility model provides an insulating base (50) and fixed support (60) are connected with the auxiliary moving contact (30) of direct current contactor, the mounting base (10) of direct current contactor is connected with the fixed support (60), the first clamping portion is arranged on the insulating base (50), the second clamping portion is arranged on the fixed support (60), and the second clamping portion and the first clamping portion are clamped to make the fixed support (60) and the insulating base (50) clamped.

2. The connection structure of the auxiliary moving contact of a DC contactor according to claim 1, characterized in that, The utility model also includes a fastener (70), and one side of the insulating base (50) away from the overhanging end of the auxiliary moving contact (30) is provided with a mounting hole (5212), the fixed support (60) is provided with a connecting hole, and the fastener (70) is arranged in the connecting hole and the mounting hole (5212) to fix the fixed support (60) and the insulating base (50).

3. The connection structure of the auxiliary moving contact of the DC contactor according to claim 1, characterized in that, The first clamping portion is a U-shaped clamping groove (5211) extending outward from the insulating base (50), the second clamping portion is a plate-shaped convex rib (621) extending outward from the fixed support (60), and the plate-shaped convex rib (621) is clamped into the U-shaped clamping groove (5211) to clamp the second clamping portion and the first clamping portion.

4. The connection structure of the auxiliary moving contact of the DC contactor according to claim 3, characterized in that, The insulating base (50) includes a first insulating base (51) and a second insulating base (52) arranged in layers, a first end of the auxiliary moving contact (30) is fixedly arranged on the first insulating base (51), and a second end of the auxiliary moving contact (30) is suspended on the first insulating base (51), and the U-shaped clamping groove (5211) is formed on the second insulating base (52).

5. The connection structure of the auxiliary moving contact of the DC contactor according to claim 4, characterized in that, The first insulating base (51) includes two first side walls (511) arranged opposite to each other and a connecting wall (512) fixedly connected between the two first side walls (511), the first end of the auxiliary moving contact (30) is fixedly arranged in the connecting wall (512), and the second end of the auxiliary moving contact (30) extends away from the connecting wall (512) and is suspended.

6. The connection structure of the auxiliary moving contact of the DC contactor according to claim 4, characterized by The second insulating base (52) includes a top wall (521) fixedly connected below the first insulating base (51) and a limiting wall (522) fixedly connected to one side of the top wall (521) close to the second end of the auxiliary moving contact (30), the U-shaped clamping groove (5211) is formed on the top wall (521), and the limiting wall (522) is used for limiting the plate-shaped convex rib (621) to slide and clamp into the U-shaped clamping groove (5211) via an opening of the U-shaped clamping groove (5211) in cooperation with the fixed support (60).

7. The connection structure of the auxiliary moving contact of a DC contactor according to claim 6, characterized in that, The fixing support (60) comprises two second side walls (61) oppositely arranged and a cover plate (62) fixedly connected above the two second side walls (61), the second side walls (61) are used for being fixedly connected with the mounting base (10), the second side wall (61) near one side of the second end of the auxiliary movable contact (30) is also used for cooperating with the limiting wall (522) to limit the sliding stroke of the plate-shaped convex rib (621), the cover plate (62) is used for separating the top wall (521) and the magnetic top plate (40) of the DC contactor, and the plate-shaped convex rib (621) is formed on the cover plate (62).

8. The connection structure of the auxiliary moving contact of the DC contactor according to any one of claims 1 to 7, characterized in that, The number of the first clamping parts and the second clamping parts is two, the two first clamping parts are arranged on opposite sides of the insulating base (50) respectively, the two second clamping parts are arranged on opposite sides of the fixing support (60) respectively, and the two second clamping parts are clamped in the two first clamping parts one by one.

9. A direct current contactor characterized by, The DC contactor auxiliary movable contact connecting structure comprises a mounting base (10), a movable terminal (20), a static terminal (90) matched with the movable terminal (20), an auxiliary movable contact (30), an auxiliary static contact (100) matched with the auxiliary movable contact (30) and the DC contactor auxiliary movable contact connecting structure of any one of claims 1-8, the movable terminal (20) is floatingly installed in the mounting base (10), the auxiliary movable contact (30) is fixedly connected with the mounting base (10) through the connecting structure, and the auxiliary movable contact (30) is located on one side of the movable terminal (20).

10. The DC contactor of claim 9, wherein, The DC contactor auxiliary movable contact connecting structure further comprises a magnetic yoke plate (110) located below the mounting base (10), a coil frame (120) and a circuit board (130) located in the magnetic yoke plate (110), and the circuit board (130) is located between the magnetic yoke plate (110) and the coil frame (120).

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