CN219626559U - Armature part and push card connection structure and electromagnetic relay - Google Patents

Abstract

The utility model discloses a connecting structure of an armature part and a push card and an electromagnetic relay, wherein the connecting structure comprises the armature part and the push card, the push card is made of thermosetting materials, the armature part is provided with an elastic clamping structure, the elastic clamping structure deforms by being stressed and is arranged on the push card in a penetrating way in a deformation state without obstruction, and the elastic clamping structure is assembled with the push card by being restored after being released. According to the utility model, on one hand, the high-temperature resistance of the push card can be improved by utilizing the characteristics of high chemical resistance, heat resistance and difficult deformation of the thermosetting material, so that the push card is prevented from being deformed or melted under the condition of large current carrying to influence the normal operation of the relay, and on the other hand, the armature part and the push card can be connected in a clamping manner, so that the connection is simple and convenient, and plastic scraps generated by the assembly friction of the armature part and the push card can be avoided.

Description

Armature part and push card connection structure and electromagnetic relay

Technical Field

The utility model relates to the technical field of relays, in particular to a connecting structure of an armature part and a push card and an electromagnetic relay.

Background

An electromagnetic relay is an electronic control device which is commonly used in automatic control circuits and is actually an "automatic switch" which uses a smaller current to control a larger current, thus playing roles in automatic regulation, safety protection, switching circuits, etc. in the circuit.

An electromagnetic relay of the prior art includes a base, a magnetic circuit portion, a movable spring portion, a stationary spring portion, and a push clip, the magnetic circuit portion being mated with the movable spring portion by the push clip. The pusher card is typically supported by a thermoplastic material and is typically mounted by elastic deformation of the thermoplastic material of the pusher card when connected to the armature portion of the magnetic circuit portion to avoid plastic chips during assembly. However, under the high load of 180A, thermoplastic materials are easy to be heated and deformed at high temperature, and the heat resistance of the thermoplastic materials is poor, when an arc is generated by breaking a contact, the contact part of the pushing card and the movable spring part can be rapidly melted under the continuous action of arc heat, so that the effective stroke of the pushing card for pushing the movable spring part is shortened, the movable contact on the movable spring part cannot be effectively contacted with the stationary contact on the stationary spring part, and finally the relay cannot work normally. In the prior art, the push card is also connected to the base of the relay in a sliding manner by adopting a sliding rail, and the armature part is in contact fit with the push card, so that plastic scraps cannot be generated in the mode, but the push point of the push card is changed along with the swinging angle of the armature, so that the consistency of product parameters is poor.

Disclosure of Invention

Aiming at the prior art, the utility model provides a connecting structure of an armature part and a push card and an electromagnetic relay, which can prevent the push card from being deformed and melted by heat and can realize chipless installation through structural improvement.

The technical scheme adopted for solving the technical problems is as follows: the utility model provides an armature part and promote card connection structure, includes armature part and promotes the card, promote the card and be the thermosetting material, armature part is equipped with elasticity screens structure, and this elasticity screens structure warp through the atress to wear to locate in the deformation state is unobstructed promote the card, just elasticity screens structure is released the back through restoring and with promote card assembly joint.

Further, the elastic clamping structure comprises two clamping arms which are distributed in parallel, the two clamping arms are folded inwards relatively by being stressed and are penetrated in the pushing card in a folded state, and the two clamping arms are assembled with the pushing card by being spread outwards relatively after being released; one end of the pushing card is provided with a clamping hole which is suitable for being clamped and engaged with the armature part; the clamping holes are in a strip shape and extend further along the arrangement direction of the two clamping arms, a limiting groove is formed in the outer side of the tail ends of the two clamping arms respectively, and the two limiting grooves are meshed with the two ends of the clamping holes respectively.

Further, the armature part is provided with a pushing block located between the two clamping arms, and the pushing block penetrates through the clamping hole.

Further, the positions of the inner sides of the clamping holes, which are close to the other ends of the pushing cards, corresponding to the two clamping arms are respectively provided with a yielding groove so as to avoid the clamping arms.

Further, the armature part comprises an armature, a plastic piece and a metal piece, wherein the armature and the metal piece are fixedly connected through the plastic piece or are injection-molded together through the plastic piece, and the armature and the metal piece are separated by the plastic piece; the metal piece is provided with the elastic clamping structure; alternatively, the armature portion is an armature; the armature part is L-shaped.

The utility model further provides an electromagnetic relay which comprises a movable spring part and a pushing card, and further comprises the connecting structure of the armature part and the pushing card, wherein the connecting structure is used for connecting the pushing card with the movable spring part.

Further, the pushing clamp is provided with a first clamping groove, one side end of the movable spring part is provided with a second clamping groove, and the first clamping groove and the second clamping groove are mutually meshed together; the three sides of the second clamping groove are respectively provided with a flanging which is bent to one side of the thickness direction of the part where the second clamping groove is located.

Further, the number of the movable spring parts is two, the two movable spring parts are arranged in parallel, the number of the first clamping grooves is two, and the two first clamping grooves are arranged in back to back.

Further, the movable spring part is provided with a plurality of movable contacts which are arranged in parallel, the pushing clamp is provided with a pushing rib for pushing the movable spring part to act, and the pushing rib and the movable contacts are positioned on the opposite sides and extend along the arrangement direction of the plurality of movable contacts.

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

1. because the pushing card is made of thermosetting materials, the armature part is provided with the elastic clamping structure, the elastic clamping structure deforms by being stressed and passes through the pushing card in a deformation state in an unobstructed manner, and the elastic clamping structure is assembled and combined with the pushing card by being restored after being released, so that the high-temperature resistance of the pushing card can be improved by utilizing the characteristics of higher chemical resistance, heat resistance and difficult deformation of the thermosetting materials on the one hand, the normal operation of a relay is prevented from being influenced by deformation or melting of the pushing card under the condition of large current carrying, the armature part and the pushing card can be connected in a clamping manner, the connection is simple and convenient, plastic scraps generated by the assembly friction of the armature part and the pushing card can be avoided, and the technical prejudice that the thermosetting materials do not have elastic deformation capability and are not suitable for clamping is overcome. Meanwhile, the utility model also enables the pushing card to synchronously move with the armature part, and avoids the influence on the consistency of product parameters caused by the change of pushing points of the pushing card.

2. The elastic clamping structure preferably comprises the two clamping arms, and has the characteristics of simple structure, easy molding, convenient assembly and the like.

3. The arrangement of the pushing block enables the contact surface between the armature part and the pushing card to be larger and the matching to be more stable. The setting of groove of stepping down can avoid two card arms and promote when the piece flatness is inconsistent, can influence the promotion piece and promote the card effective contact.

4. The pushing ribs are arranged, so that the utility model can ensure the stress balance of a plurality of movable contacts and realize synchronous action.

The utility model is described in further detail below with reference to the drawings and examples; the structure for connecting the armature part and the push card of the utility model and the electromagnetic relay are not limited to the embodiment.

Drawings

Fig. 1 is a schematic perspective view of an armature portion of the present utility model;

FIG. 2 is a schematic perspective view of a pusher card of the present utility model;

FIG. 3 is a schematic perspective view of the armature portion and pusher card of the present utility model in a combined state;

fig. 4 is a schematic perspective view (without a housing) of the electromagnetic relay of the present utility model;

FIG. 5 is a schematic perspective view of the moving spring part of the present utility model;

FIG. 6 is a schematic view of a perspective construction of a first flexible copper foil of the present utility model;

FIG. 7 is a schematic view of a perspective construction of a second flexible copper foil of the present utility model;

FIG. 8 is a schematic perspective view of the elastic sheet of the present utility model;

FIG. 9 is an enlarged schematic view of portion A of FIG. 8;

FIG. 10 is a schematic diagram of a perspective construction of a moving spring portion of the present utility model (without the first flexible copper foil);

FIG. 11 is a top view of the push card and the moving spring portion of the present utility model in a combined state (the moving spring portion is partially embodied);

the spring comprises a rigid movable spring, 11, a first lug, 2, a rigid movable spring leading pin, 21, a second lug, 3, a movable contact, 4, a first flexible copper foil, 41, a strip hole, 5, a second flexible copper foil, 51/61, a second bifurcation groove, 6, an elastic piece, 62, a second clamping groove, 63, a flanging, 7, a rotating shaft, 8, an armature part, 81, an armature, 82, a plastic part, 83, a metal part, 831, a clamping arm, 832, a pushing block, 833, a limiting groove, 834, a first bifurcation groove, 9, a pushing clamp, 91, a clamping hole, 911, a yielding groove, 92, a first clamping groove, 93, a long rod, 931, a pushing rib, 10, a base, 20 and a static spring part.

Detailed Description

In the present disclosure, the terms "first," "second," and the like are used merely to distinguish between similar objects and not necessarily to describe a particular sequence or order, nor are they to be construed as indicating or implying a relative importance. In addition, in the description of the present utility model, unless otherwise indicated, "a plurality" means two or more, and "at least one" means one or more. "and/or", describes an association relationship of an association object, and indicates that there may be three relationships, for example, a and/or B, and may indicate: a exists alone, A and B exist together, and B exists alone. The character "/" generally indicates that the context-dependent object is an "or" relationship.

Referring to fig. 1-3, a connection structure between an armature portion and a push card of the present utility model includes an armature portion 8 and the push card 9, wherein the push card 9 is made of a thermosetting material, the armature portion 8 is provided with an elastic clamping structure, the elastic clamping structure is deformed by being stressed and is passed through the push card in a deformation state without obstruction, and the elastic clamping structure is assembled with the push card by being restored after being released.

The elastic clamping structure comprises two clamping arms 831 which are distributed in parallel, the two clamping arms 831 are folded inwards relatively under the action of stress and pass through the push card 9 in a folded state, and the two clamping arms 831 are released and then are clamped and assembled with the push card 9 by being spread outwards relatively.

As shown in fig. 1, the armature portion 8 specifically includes an armature 81, a plastic member 82 and a metal member 83, where the armature 81 and the metal member 83 are fixedly connected or insert-molded together by the plastic member 82, and the armature 81 and the metal member 83 are separated by the plastic member 82, so that the creepage distance between the magnetic circuit portion and the contact portion of the relay can be increased. The metal member 83 may be replaced by a part made of other materials with better rigidity and high temperature resistance. The armature portion 8 has an L-shape, but is not limited thereto. The armature portion 8 is provided with a pushing block 832 located between the two clamping arms 831, and the armature portion 8 is provided with a first bifurcation slot 834 between the two clamping arms 831 and the pushing block 832, respectively. Specifically, the pushing block 832 and the clamping arm 831 are respectively disposed on the metal member 83, and the metal member 83 forms the two clamping arms 831 and the pushing block 832 by providing two first bifurcation slots 834. And a limiting groove 833 is respectively arranged at the opposite outer sides of the tail ends of the two clamping arms 831, and the limiting groove 833 penetrates through the two sides of the metal piece 83 in the thickness direction. In other embodiments, the armature portion is integrally an armature, and the armature is provided with a resilient detent structure and a push block.

As shown in fig. 2, one end of the push card 9 is provided with a card hole 91 adapted to be engaged with the armature portion, and the card hole 91 is elongated and extends along the arrangement direction of the two card arms 831. The distance between the two opposite inner side surfaces of the limiting groove 833 is slightly larger than the depth of the clamping hole 91, so that after the two clamping arms 831 are relatively and outwards spread, the two limiting grooves 833 can be mutually meshed with the two ends of the clamping hole 91, and the effects of limiting and preventing separation are achieved. The pushing block 832 is disposed through the card hole 91, and the armature portion 8 drives the pushing card 9 to move through the pushing block 832. The inner side of the clamping hole 91 near the other end of the pushing card 9 is provided with a yielding groove 911 corresponding to the two clamping arms 831, so as to avoid the clamping arms 831, and thus, when the flatness of the two clamping arms 831 and the flatness of the pushing block 832 are inconsistent, the pushing block 832 and the pushing card 9 are prevented from being effectively contacted.

The utility model relates to a connecting structure of an armature part and a push card, which comprises the following steps of: the two clamping arms 831 of the armature part 8 are clamped by a fixture, so that the two clamping arms 831 are folded inwards in opposite directions to form an inner eight shape, the tail ends of the two clamping arms 831 and the tail ends of the pushing blocks 832 pass through the clamping holes 91 of the pushing clamps 9, and then the two clamping arms 831 of the armature part 8 are released, so that the two clamping arms 831 are restored outwards in opposite directions to be opened, and the limiting grooves 833 on the two clamping arms 831 are respectively meshed with the two ends of the clamping holes 91, as shown in fig. 3, so that the pushing clamps 9 are stably and firmly connected with the armature part 8, and plastic scraps cannot be scraped in the installation process.

According to the connecting structure of the armature part and the push card, the push card 9 is made of the thermosetting material, so that the high-temperature resistance of the push card 9 can be improved by utilizing the characteristics of high chemical resistance, heat resistance and difficult deformation of the thermosetting material, and the influence on the normal operation of the relay caused by deformation and melting of the push card 9 due to heating under the condition of large current carrying is avoided. The armature part 8 and the pushing card 9 are assembled in the mode, so that the convenience of connection of the armature part 8 and the pushing card 9 made of thermosetting materials can be improved, and plastic scraps generated by friction between the armature part 8 and the pushing card 9 due to assembly can be avoided. Meanwhile, the utility model also enables the push card 9 to synchronously move with the armature part 8, thereby avoiding the influence on the consistency of product parameters caused by the change of push points of the push card 9.

Referring to fig. 1 to 11, an electromagnetic relay of the present utility model includes a base 10, a fixed spring portion 20, and a housing (not shown), wherein the fixed spring portion and the movable spring portion 20 are respectively disposed on the base 10. The utility model also comprises a connecting structure of the armature part and the pushing card, wherein the connecting structure is characterized in that the pushing card 9 is connected with the movable spring part.

The movable spring part comprises a rigid movable spring piece 1 and at least one movable contact 3, and one end of the rigid movable spring piece 1 is rotatably arranged, so that the rigid movable spring piece 1 can swing around the rotation axis of the rigid movable spring piece. The movable spring part further comprises a conductive flexible deformation structure which is electrically connected to the other end of the rigid movable spring piece 1, and the movable contact 3 is arranged on the flexible deformation structure.

The movable spring part further comprises a rigid movable spring leading-out pin 2 and a first flexible conductive piece, and the rigid movable spring leading-out pin 2 is inserted into the base. The two ends of the first flexible conductive piece are respectively and electrically connected with the rigid movable spring 1 and the rigid movable spring leading-out pin 2, and the two ends form a U-shaped structure. Specifically, the flexible deformation structure comprises at least one second flexible conductive element and at least one elastic sheet 6, one end of the second flexible conductive element and one end of the elastic sheet 6 are respectively and fixedly connected with the other end of the rigid movable reed 1, and the other end of the second flexible conductive element and the other end of the elastic sheet 6 are respectively and fixedly connected with the movable contact 3. The number of the movable contacts 3 is plural, and the plurality of movable contacts 3 are arranged in parallel, specifically, the plurality of movable contacts 3 are arranged along the width direction of the rigid movable reed 1. The number of the movable contacts 3 is specifically two, but is not limited thereto.

The first flexible conductive element is a first flexible copper foil 4, and the first flexible copper foil 4 is U-shaped. In other embodiments, the first flexible conductive element is a copper wire or an aluminum wire or a braided wire, or the like. The two ends of the first flexible copper foil 4 are respectively riveted and fixed with the rigid movable reed 1 and the rigid movable reed leading-out pin 2, so that a plurality of riveting holes are respectively arranged at the two ends of the first flexible copper foil 4 and at the corresponding positions of the rigid movable reed 1 and the rigid movable reed leading-out pin 2. Therefore, the first flexible conductive piece (namely the first flexible copper foil 4) is connected without adopting a welding process, so that the connection process of the first flexible conductive piece and the rigid movable reed 1 and the rigid movable reed pin 2 is greatly simplified. The first flexible copper foil 4 is provided with at least one elongated hole 41, which elongated hole 41 extends in the length direction of the first flexible copper foil 4. The number of the elongated holes 41 is specifically, but not limited to, one, and both ends of the elongated holes 41 extend toward both ends of the first flexible copper foil 4, respectively. The provision of the elongated holes 41 may enhance the flexibility of the first flexible copper foil 4.

The second flexible conductive element is a second flexible copper foil 5, the second flexible copper foil 5 and the elastic sheet 6 are stacked together, and the number of the second flexible copper foils 5 is multiple, but not limited to this. The contact surface of the movable contact 3 and the elastic piece 6 are located on both sides of the second flexible copper foil 5 in the thickness direction. One end of the second flexible copper foil 5, one end of the elastic piece 6 and the other end of the rigid movable reed 1 are riveted, and the other end of the second flexible copper foil 5, the other end of the elastic piece 6 and the movable contact 3 are riveted, so that riveting holes are respectively formed at two ends of the second flexible copper foil 5, two ends of the elastic piece 6 and the other end of the rigid movable reed 1. In other embodiments, the second flexible conductive member is a copper wire or an aluminum wire or a braided wire, or the like. The elastic sheet 6 is made of stainless steel and has the characteristics of good elasticity, low heat productivity, good thermal stability and the like.

The flexible deformation structure is provided with second bifurcation grooves between adjacent movable contacts 3, so that the flexible deformation structure is bifurcated to form a plurality of branch parts which are distributed in parallel, and each branch part is provided with one movable contact 3. The number of the branches is specifically two, but not limited thereto. The second bifurcation groove is specifically formed by a second bifurcation groove 51 provided on the second flexible copper foil 5 and extending in a direction from the other end to one end thereof, and a second bifurcation groove 61 provided on the elastic sheet 6 and extending in a direction from the other end to one end thereof. The second bifurcation groove is arranged, so that when the heights of the movable contacts 3 are inconsistent, each movable contact 3 can be ensured to be in effective contact with the corresponding stationary contact.

One end of the rigid movable spring 1 is rotatably connected with one end of the rigid movable spring pin 2 by adopting a rotating shaft 7, specifically, as shown in fig. 10, two first lugs 11 are arranged on two sides of one end of the rigid movable spring 1, two second lugs 21 are arranged on one end of the rigid movable spring pin 2, and the two first lugs 11 are positioned between the two second lugs 21 and are connected together by adopting the rotating shaft 7 in a penetrating way. In other embodiments, the rigid movable spring is rotatably connected to the base, and is electrically connected to a rigid movable spring pin inserted into the base by a flexible conductive member.

The rigid movable reed 1 and the flexible deformation structure are connected with the other end of the pushing card 9 at the connection part of the rigid movable reed 1 and the flexible deformation structure, so that the rotating power arm of the rigid movable reed 1 and the overtravel arm of the contact are both longer, and the pushing card 9 is pushed more labor-saving. The other end of the pushing card 9 is provided with a first clamping groove 92, the corresponding part of the movable spring part is provided with a second clamping groove 62, and the first clamping groove 92 and the second clamping groove 62 are mutually meshed together. Since the number of the moving spring portions is two, the number of the first clamping grooves 92 is also two, and the two first clamping grooves 92 are respectively in a U shape and are arranged opposite to each other.

The second clamping groove 62 is specifically formed in the elastic piece 6 and penetrates through the rigid movable reed 1 and the second flexible copper foil 5. The three sides of the second clamping groove 62 are respectively provided with a flange 63 bent to one side of the elastic sheet 6 in the thickness direction, as shown in fig. 8 and 9, the root parts of the flanges 63 are respectively in rounded transition, so that the movable spring part can be prevented from wiping plastic scraps on the pushing card 9.

The other end of the push card 9 is provided with a push rib 931 for pushing the rigid movable reed 1 and/or the flexible deformation structure to act, the push rib 931 and the movable contact 3 are positioned on the opposite side and extend along the arrangement direction of the plurality of movable contacts 3, so that the utility model can ensure the stress balance of the plurality of movable contacts 3 on the flexible deformation structure and realize synchronous action. The pushing ribs 931 are disposed in parallel with the first clamping grooves 92. Specifically, the other end of the push card 9 is provided with a long rod 93 extending outwards from the notch of the first clamping groove 92 on the side of the first clamping groove 92 near the clamping hole 91, the side of the long rod 93 facing the moving spring part is provided with the push rib 931 extending along the length direction of the long rod, and after the push card 9 and the moving spring part are assembled, the push rib 931 is in contact fit with the middle position of the flexible deformation structure in the width direction, as shown in fig. 11.

According to the electromagnetic relay, the U-shaped structure formed by the rigid movable reed 1, the rigid movable reed leading-out pin 2 and the first flexible copper foil 4 can improve the short-circuit current resistance and the current carrying capacity, the flexible deformation structure arranged at the other end of the rigid movable reed 1 is convenient for arranging a single movable contact or a plurality of movable contacts according to actual needs, under the condition of the plurality of movable contacts, each movable contact can be effectively contacted with a corresponding fixed contact due to the flexible deformation effect of the flexible deformation structure, and the plurality of movable contacts can realize a multi-group contact parallel connection mode, so that contact temperature rise is reduced, and the effects of high current carrying and low heating are realized. The flexible deformation structure can also realize the overtravel of the contact, improve the contact pressure, make the movable contact more reliable with the stationary contact to, when producing great electrodynamic force because of short-circuit current between movable contact and the stationary contact, even the rigidity movable reed is repelled, the flexible deformation structure of bottom also can guarantee the reliable contact of contact through flexible deformation. This is because the flexible deformation structure generates a larger deformation in the contact overstroke state, and can provide a larger contact pressure, thereby being capable of counteracting the electric repulsive force. Therefore, the utility model can improve the electric repulsion resistance, thereby improving the short-circuit current resistance.

The utility model relates to a structure and principle of an armature part and a push card connection structure, and the like, and the description thereof is referred to above, and will not be repeated here.

The armature part and push card connecting structure and the electromagnetic relay of the utility model have the advantages that parts (such as coil assemblies matched with the armature part and the like) which are not related to the electromagnetic relay are the same as or can be realized by adopting the prior art.

The above embodiment is only used for further explaining a connection structure between the armature portion and the push card and the electromagnetic relay, but the present utility model is not limited to the embodiment, and any simple modification, equivalent variation and modification of the above embodiment according to the technical substance of the present utility model falls within the protection scope of the technical solution of the present utility model.

Claims (10)

1. The utility model provides an armature part and promote card connection structure, includes armature part and promotes the card, its characterized in that: the push card is made of thermosetting materials, the armature part is provided with an elastic clamping structure which deforms under the action of force and passes through the push card in a deformation state without obstruction, and the elastic clamping structure is assembled with the push card through restoration after being released.

2. The armature portion and pusher card connection of claim 1, wherein: the elastic clamping structure comprises two clamping arms which are distributed in parallel, the two clamping arms are folded inwards relatively by being stressed and pass through the pushing card in a folded state, and the two clamping arms are unfolded relatively outwards to be assembled and combined with the pushing card after being released; one end of the pushing card is provided with a clamping hole which is suitable for being clamped and engaged with the armature part; the clamping holes are in a strip shape and extend along the arrangement direction of the two clamping arms.

3. The armature portion and pusher card connection of claim 2, wherein: and the opposite outer sides of the tail ends of the two clamping arms are respectively provided with a limiting groove, and the two limiting grooves are respectively meshed with the two ends of the clamping hole.

4. A connection structure of an armature portion and a push card as claimed in claim 2 or 3, characterized in that: the armature part is provided with a pushing block positioned between the two clamping arms, and the pushing block penetrates through the clamping hole.

5. The armature portion and pusher card connection of claim 4, wherein: and the positions of the clamping holes, which are close to the inner side surfaces of the other ends of the pushing cards, corresponding to the two clamping arms are respectively provided with a yielding groove so as to avoid the clamping arms.

6. The armature portion and pusher card connection of claim 1, wherein: the armature part comprises an armature, a plastic piece and a metal piece, wherein the armature and the metal piece are fixedly connected through the plastic piece or are injection-molded together through the plastic piece, and the armature and the metal piece are separated by the plastic piece; the metal piece is provided with the elastic clamping structure; alternatively, the armature portion is an armature; the armature part is L-shaped.

7. An electromagnetic relay comprising a moving spring portion and a push card, characterized in that: further comprising an armature portion and push card connection structure as claimed in any one of claims 1-6, the push card being connected to the moving spring portion.

8. The electromagnetic relay according to claim 7, wherein: the pushing clamp is provided with a first clamping groove, one side end of the movable spring part is provided with a second clamping groove, and the first clamping groove and the second clamping groove are mutually meshed together; the three sides of the second clamping groove are respectively provided with a flanging which is bent to one side of the thickness direction of the part where the second clamping groove is located.

9. The electromagnetic relay according to claim 8, wherein: the number of the movable spring parts is two, the two movable spring parts are arranged in parallel, the number of the first clamping grooves is two, and the two first clamping grooves are arranged opposite to each other.

10. The electromagnetic relay according to claim 8 or 9, wherein: the movable spring part is provided with a plurality of movable contacts which are arranged in parallel, the pushing clamp is provided with a pushing rib for pushing the movable spring part to act, and the pushing rib and the movable contacts are positioned on the opposite sides and extend along the arrangement direction of the plurality of movable contacts.