CN219642749U - Moving contact assembly and electromagnetic relay - Google Patents

Abstract

The utility model provides a movable contact assembly and an electromagnetic relay with the same, comprising a movable reed, a movable contact arranged on one surface of the movable reed and a vibration reduction structure arranged on the other surface of the movable reed, wherein the vibration reduction structure comprises at least one group of elastic arm groups, each group of elastic arm groups comprises at least two elastic arms, one side, close to the movable reed, of each elastic arm is used as a starting end, and the other side, far from the movable reed, of each elastic arm group is used as a terminal end; at least two elastic arms in the elastic arm group incline from the initial end to the terminal end, and the inclination directions of the two elastic arms are opposite so as to enable the two elastic arms to mutually intersect; when the movable contact is contacted with the fixed contact, a certain distance is reserved between the highest point of the elastic arm group and the base of the relay; when the movable contact and the fixed contact are separated, the elastic arms of the elastic arm group are abutted with the base of the relay to perform vibration reduction. Therefore, vibration reduction is effectively buffered, reed shake is reduced, and repeated arcing conditions of the contact piece are improved.

Description

Moving contact assembly and electromagnetic relay

Technical Field

The utility model relates to the technical field of relays, in particular to a movable contact assembly and an electromagnetic relay.

Background

An electromagnetic relay is an automatic switch component, and the typical structure of the electromagnetic relay comprises an electromagnetic system and a contact system, wherein the electromagnetic system comprises an armature, a permanent magnet, a yoke and an iron core; the contact system comprises a movable contact part and a fixed contact part corresponding to the movable contact part, wherein the movable contact part comprises a movable reed and a movable contact arranged on the movable reed, and the movable contact part is connected with an armature of the electromagnetic system; the electromagnetic system drives the movable contact to contact with or separate from the stationary contact of the stationary contact part by controlling the movement of the armature, so that the switch is realized between a self-holding state in which the contacts are contacted and a resetting state in which the contacts are separated.

In the contact breaking process, the secondary arcing problem caused by the shake of the movable contact spring is easy to occur, and the gasket is more commonly added in the prior art to increase the rigidity of the spring in the process of separating the movable contact from the static contact of the static contact part, so that a certain vibration reduction effect is achieved. However, with the development of technology, the performance requirements of the market on the relay are higher; the pad is singly arranged, so that the vibration reduction effect is poor, the effect of preventing repeated arcing of the contact piece is not strong, and the market requirement cannot be met.

Disclosure of Invention

Therefore, the movable contact assembly and the electromagnetic relay provided by the utility model can effectively buffer and damp, reduce reed shake, improve repeated arcing conditions of the contact assembly and improve product performance.

In order to achieve the above purpose, the technical scheme provided by the utility model is as follows:

the movable contact assembly comprises a movable reed, and a movable contact arranged on one surface of the movable reed so as to be correspondingly matched with a fixed contact of the fixed contact assembly; the vibration reduction structure comprises at least one group of elastic arms, wherein the elastic arms comprise at least two elastic arms, one side, close to the movable reed, of each elastic arm is used as a starting end, and the other side, far away from the movable reed, of each elastic arm is used as a terminal end; two elastic arms in the elastic arm group incline from the initial end to the terminal end, and the inclination directions of the two elastic arms are opposite so as to enable the two elastic arms to mutually intersect; when the movable contact is contacted with the fixed contact, a certain distance is reserved between the highest point of the elastic arm group and the base of the relay; when the movable contact and the fixed contact are separated, the elastic arms of the elastic arm group are abutted with the base of the relay to perform vibration reduction.

Further, the plurality of elastic arms of each elastic arm group are damped step by step from the end part to the middle part of the movable reed.

Further, the vertical height from the highest point of a plurality of elastic arms of each elastic arm group to the movable reed gradually decreases from the end part to the middle part of the movable reed.

Further, the vibration reduction structure comprises a gasket, one surface of the gasket is attached to the tail part of the upper contact of the movable contact, the surface of the gasket is far away from the movable contact, the elastic arm group is arranged on the other surface of the gasket, and when the movable contact and the fixed contact are separated, the gasket and the elastic arm group act together to reduce vibration.

Further, the gasket is provided with a U-shaped notch, the lengths of two sides of the U-shaped notch are different, and the elastic arms which are mutually intersected in the elastic arm group are parts which extend obliquely from the end parts of two sides of the U-shaped notch to the other side respectively.

Further, the number of the elastic arm groups is two, and the elastic arm groups are respectively arranged on two corresponding sides of the movable reed along the width direction or the length direction.

Further, the elastic arms extend along the length direction of the movable reed, wherein the initial end of one of the two mutually intersected elastic arms, which is firstly in contact with the base of the relay, is closer to the middle position of the movable reed, and the initial end of the other elastic arm is closer to the end of the movable reed.

Further, the terminal of the elastic arm is provided with a bending part, the bending part bends towards the side where the movable reed is located, and the highest point of the elastic arm is located at the bending part of the bending part.

Further, the movable reed is composed of a plurality of reeds which are stacked together, and the vibration reduction structure is arranged on one reed which is farthest from the movable contact.

The present utility model also provides an electromagnetic relay including a contact system and a base for receiving the contact system; the contact system comprises a movable contact assembly and a stationary contact assembly, wherein the movable contact assembly is the movable contact assembly.

The technical scheme provided by the utility model has the following beneficial effects:

the utility model is provided with a vibration damping structure, and the vibration damping effect is realized through at least two mutually-crossed elastic arms arranged on the vibration damping structure; in addition, the elastic arms adopt a mode of reversely intersecting each other, so that the effective space can be fully utilized, the arm length of the elastic arms is longer, the flexibility is increased, the elastic deformation quantity of the elastic arms is increased, and the vibration reduction effect is improved;

secondly, the plurality of elastic arms of each elastic arm group are damped step by step from the end part to the middle part of the movable reed, so that the effect of multi-section damping is realized, the risk of secondary arcing caused by reed shake in the breaking process between contacts can be effectively prevented, and instant sticking in the process is prevented; the loss of the silver content of the contact is reduced, the relay service life time is prolonged, or the requirement of cost reduction is met;

and the elastic arm group is integrated with the gasket, so that the elastic arm group is further overlapped with the function of improving the flexibility of the elastic arm group during vibration reduction on the basis of the original characteristic of the gasket for increasing the rigidity of the movable reed during breaking, and the vibration reduction and stop effects are better.

Finally, the initial end of one elastic arm which is firstly in butt joint with the base of the relay in the two elastic arms which are mutually intersected on the vibration reduction structure is closer to the middle position of the movable reed, and the initial end of the other elastic arm is closer to the end part of the movable reed; therefore, the middle part of the movable reed is stopped and damped, and then the movable reed is transited to the end part of the movable reed to further assist in damping, so that the stopping effect is improved.

Drawings

FIG. 1 is a schematic view of a first embodiment of the present utility model;

FIG. 2 shows a side view of a first embodiment of the utility model;

FIG. 3 is an enlarged view of a portion of FIG. 2;

fig. 4 is a schematic view showing the structure of a contact system according to a first embodiment of the present utility model;

FIG. 5 is a schematic diagram showing the connection between a movable contact spring and a vibration damping structure according to a first embodiment of the present utility model;

FIG. 6 is a top view showing a movable contact spring and a vibration damping structure according to a first embodiment of the present utility model;

FIG. 7 is a schematic view showing a structure of a vibration damping structure according to a first embodiment of the present utility model;

fig. 8 is a side view showing a movable contact spring and a vibration reduction structure according to a first embodiment of the present utility model;

fig. 9 is a schematic structural view of a vibration damping structure according to a second embodiment of the present utility model;

fig. 10 is a side view showing a vibration damping structure of a second embodiment of the present utility model.

Description of the reference numerals:

100-electromagnetic system, 101-armature, 200-contact system, 201-movable contact point component, 202-static contact point component, 20-movable spring, 30-movable contact point, 40-movable spring lead-out sheet, 50-static spring, 60-static contact point, 300-base, 301-upper cavity, 302-lower cavity and 400-push card;

10-vibration damping structure, 1-elastic arm group, 11-elastic arm, 111-first elastic arm, 112-second elastic arm, 113-third elastic arm; 110-bending part and 2-gasket.

Detailed Description

For further illustration of the various embodiments, the utility model is provided with the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments and together with the description, serve to explain the principles of the embodiments. With reference to these matters, one of ordinary skill in the art will understand other possible embodiments and advantages of the present utility model. The components in the figures are not drawn to scale and like reference numerals are generally used to designate like components.

The utility model will now be further described with reference to the drawings and detailed description.

Example 1

Referring to fig. 1 to 8, the electromagnetic relay provided in this embodiment includes an electromagnetic system 100, a contact system 200, a base 300, and a push card 400, wherein an inner space of the base 300 is divided into an upper cavity 301 and a lower cavity 302, and the electromagnetic system 100 and the contact system 200 are respectively disposed in the upper cavity 301 and the lower cavity 302 of the base 300. The electromagnetic system 100 comprises an armature 101, a permanent magnet, a yoke iron, an iron core and other components; the contact system 200 includes a moving contact assembly 201 and a stationary contact assembly 202; the armature 101 of the electromagnetic system 100 is connected with the movable contact assembly 201 of the contact system 200 by the push card 400, so that the movable contact 30 of the movable contact assembly 201 is driven to contact or separate from the stationary contact 60 of the stationary contact assembly 202 by controlling the movement of the armature 101, thereby switching between a self-holding state in which the contacts are in contact and a reset state in which the contacts are separated, and switching is realized.

Specifically, referring to fig. 2 to 6, the movable contact assembly 201 includes a movable contact 20, a movable contact 30 provided on the movable contact 20, a vibration damping structure 10, and a movable contact lead 40; the stationary contact assembly 202 includes a stationary reed 50 and a stationary contact 60 provided on the stationary reed 50; wherein, the movable contact 30 is arranged on one surface of the movable reed 20 to correspondingly match with the stationary contact 60 of the stationary contact assembly 202; the vibration damping structure 10 is provided on the other surface of the movable contact spring 20 to damp vibration when the movable contact 30 and the stationary contact 60 are separated. In this embodiment, one end of the movable contact 20 away from the movable contact 30 is fixedly connected with the movable contact lead-out sheet 40, and the movable contact lead-out sheet 40 and the spacer are separately arranged on both sides of the movable contact 20.

Referring to fig. 7, the vibration damping structure 10 includes at least one elastic arm set 1, where the elastic arm set 1 includes at least two elastic arms 11, and one side of the elastic arm 11, which is close to the movable reed 20, is used as a starting end, and the other side, which is far from the movable reed 20, is used as a terminal end; wherein at least two elastic arms 11 incline from the initial end to the final end, and the inclination directions of the two elastic arms are opposite so as to enable the two elastic arms to mutually cross; when the movable contact 30 and the stationary contact 60 are in contact, a certain distance is reserved between the highest point of the elastic arm 11 and the base 300 of the relay; when the movable contact 30 and the stationary contact 60 are separated, the elastic arm 11 first abuts against the base 300 of the relay to damp vibration. During the breaking process of the movable contact 30 and the stationary contact 60, each elastic arm 11 abuts against the base 300, and the elastic arm 11 is elastically deformed to correspondingly consume the kinetic energy of the movable reed 20, so that the movable reed 20 is decelerated, and the buffering and vibration-damping effects are achieved. And the elastic arms 11 adopt a mode of reversely intersecting each other, so that the effective space can be fully utilized, the arm length of the elastic arms 11 is longer, the flexibility is increased, the elastic deformation quantity of the elastic arms 11 is increased, and the vibration reduction effect is improved.

In this embodiment, the number of the elastic arm groups 1 may be two groups, three groups or multiple groups according to the requirements of different relays on reed rebound control; when the number of the elastic arm groups 1 is two, the two elastic arm groups 1 are respectively arranged on the corresponding two sides of the movable reed 20 along the width direction or the length direction, so as to improve the vibration reduction effect and ensure the stress balance of the left side and the right side of the movable reed 20. In other embodiments, the number of the elastic arm groups 1 may be three, and the first group and the second group of elastic arm groups 1 may be symmetrically disposed on two sides of the movable reed 20 along the width direction; the third elastic arm group 1 is positioned at the rear ends of the two elastic arm groups 1 so as to be closer to the middle position of the movable reed 20, and the third elastic arm group 1 is arranged between the first elastic arm group 1 and the second elastic arm group 1 in the width direction of the movable reed 20; or the number of the elastic arm groups 1 can be four, and the elastic arm groups 1 are symmetrically arranged in the length direction or the width direction of the movable reed 20 in pairs so as to enhance the vibration damping effect, and the number of the elastic arm groups 1 is not limited. The number of the elastic arms 11 arranged in each group of elastic arm groups 1 can be set to be different according to the requirements of different relays on reed rebound control, and the number is not limited herein. In this embodiment, the number of the elastic arm groups 1 is two, the two elastic arm assemblies 1 are respectively disposed on two sides of the movable reed 20 along the width direction, and each elastic arm group 1 is provided with two elastic arms 11, and the two elastic arms 11 are illustrated as intersecting each other.

Wherein, the end parts of the driven reeds 20 of the plurality of elastic arms 11 of each group of elastic arms 1 are damped step by step to the middle position. The different butt positions of the push card 400 and the movable spring 20 can lead to slight difference in the stress deformation process of the movable spring 20, so that the elastic arm 11 is slightly different in the structure for matching vibration reduction, and the parameter setting of the elastic arm 11 can be adjusted to better adapt to the vibration reduction requirements of different products. Referring to fig. 1 and 2, when the push card 400 is clamped with the end of the movable reed 20 near one end of the movable contact 30, the movable reed 20 swings with the end of the movable reed 20 far from the movable contact 30 as a fulcrum (the movable reed 20 is fixedly connected with the movable reed leading-out sheet 40 on the side far from the contact), i.e. the swing range of the movable reed 20 is approximately V-shaped, the end of the movable reed 20 near one end of the movable contact 30 is abutted with the base 300 earlier, and correspondingly, the plurality of elastic arms 11 of the elastic arm group 1 are abutted with the base 300 in front-back order, and the elastic arms 11 of the terminal of the elastic arm 11 near the end of the movable reed 20 are abutted with the base 300 earlier, so that the gradual vibration reduction effect is realized from the end of the movable reed 20 to the middle position of the plurality of elastic arms group 1, the spring rebound of the spring is effectively reduced, and the action rebound is reduced.

When the push card 400 is clamped with the middle part of the movable reed 20, the swing fulcrum of the movable reed 20 is the contact point between the push card 400 and the movable reed 20, so that the sequence difference between the plurality of elastic arms 11 of the elastic arm group 1 positioned at one end of the movable reed 20 and the contact point of the base 300 is not large, and the progressive vibration reduction effect is not strong. At this time, the progressive vibration reduction effect can be achieved by differentially setting the highest point of the plurality of elastic arms 11 of the elastic arm group 1 to the vertical height of the movable reed 20, from the end portions to the middle portions of the plurality of elastic arms 11 of each group of elastic arm group 1. Naturally, the difference between the highest point of the plurality of elastic arms 11 of the elastic arm set 1 and the vertical height of the movable spring 20 is also applicable to the situation that the push card 400 is clamped with the end of the movable spring 20, so as to further improve the progressive vibration reduction effect of the plurality of elastic arms 11.

In this embodiment, the highest point of the plurality of elastic arms 11 of each elastic arm group 1 is gradually decreased from the highest point to the end of the driven reed 20 with the vertical height of the driven reed 20 to the middle position, so as to achieve the effect of gradual vibration reduction. Specifically, referring to fig. 8, the elastic arm 11 defining the highest point of the elastic arm 11 to the highest vertical height of the movable spring 20 is the first elastic arm 111, and defining the vertical height of the first elastic arm 111 to the movable spring 20 is h1; the terminal end of the first elastic arm 111 is now closer to the end position of the movable reed 20; the elastic arm 11 defining the highest point of the elastic arm 11 to be slightly lower than h1 in the vertical height of the movable spring 20 is the second elastic arm 112, and defining the vertical height of the second elastic arm 112 to be h2 in the movable spring 20; the terminal end of the second elastic arm 112 is now closer to the middle position of the movable contact spring 20. In the breaking process of the movable contact 30 and the fixed contact 60, the first elastic arm 111 is firstly abutted against the base 300, and the rebound speed of the movable reed 20 is slowed down by the elastic deformation of the first elastic arm 111, and the kinetic energy of the movable reed 20 is effectively consumed, so that the vibration reduction in the first stage is realized; then, the second elastic arm 112 is abutted against the base 300, the kinetic energy of the movable reed 20 is further consumed through the elastic deformation of the second elastic arm 112, so that the vibration reduction of the second stage is realized, and the like, the effect of multistage gradual vibration reduction can be realized by arranging a plurality of elastic arms 11 and gradually decreasing the highest point of the plurality of elastic arms 11 to the position from the end part of the movable reed 20 to the middle part of the movable reed 20 in the vertical height, so that the risk of secondary arcing caused by reed shake in the breaking process between contacts can be effectively prevented, and the prevention process is instant sticky.

Further, the elastic arms 11 extend along the length direction of the movable reed 20, wherein the initial end of one of the two mutually intersected elastic arms 11 that is first in contact with the base 300 of the relay is closer to the middle position of the movable reed 20, and the initial end of the other elastic arm 11 is closer to the end of the movable reed 20. Specifically, referring to fig. 2 to 3, the first elastic arm 11 abutting against the base 300 of the relay, that is, the initial end of the first elastic arm 111 is closer to the middle position of the movable reed 20, and the second elastic arm 112 abutting against the base 300 of the relay, that is, the initial end of the second elastic arm 112 is closer to the end of the movable reed 20; in this way, during the breaking process of the movable contact 30 and the stationary contact 60, the elastic arm group 1 acts on the middle position of the movable reed 20 first, then acts on the end of the movable reed 20, so as to damp at the middle position first, and then further transits to the head to damp at the position, so that the damping and stopping effects are better.

Specifically, as shown in fig. 7, the terminal end of each elastic arm 11 is provided with a bending portion 110, the bending portion 110 is bent towards the side of the movable reed 20, and the highest point of the elastic arm 11 is located at the bending position of the bending portion 110. In this way, when the movable contact 30 and the stationary contact 60 are separated, the portion of the elastic arm 11 abutting against the base 300 is in arc surface contact, so that collision damage between the elastic arm 11 and the partition plate can be reduced, and the service life of the product can be prolonged.

In this embodiment, the vibration damping structure 10 further includes a spacer 2, one surface of the spacer 2 is attached to the contact tail portion on the movable contact spring 20, and is far away from one surface of the movable contact 30, the elastic arm set 1 is disposed on the other surface of the spacer 2, and when the movable contact 30 and the stationary contact 60 are separated, the spacer 2 and the elastic arm set 1 act together to perform vibration damping. The gasket 2 added to the movable contact spring 20 is beneficial to enhancing the rigidity of the movable contact spring 20, improving the breaking effect at the moment of separating the movable contact 30 from the fixed contact 60, and reducing the risk of bonding between the contacts; meanwhile, the gasket 2 plays a good role in damping the movable reed 20; the elastic arm group 1 is combined to further strengthen the buffering and vibration reduction effect when the movable contact 30 and the fixed contact 60 are separated. That is, the present embodiment integrates the functions of rigid breaking and flexible vibration reduction, and the gasket 2 is used to increase the rigidity of the movable reed 20 during breaking, and meanwhile, the integrally arranged reverse crossed elastic arm group 1 improves the flexibility during vibration reduction, so that the number of times of the electrical service life of the relay is greatly improved. Wherein, the center position of the gasket 2 is provided with a through hole for installing the movable contact 30, the movable contact 20 is also provided with an installing hole, one end of the movable contact 30 passes through the installing hole on the movable contact 20 and the through hole on the gasket 2, and the three are fixed by welding. Or, the gasket 2 may be integrally formed with the movable contact spring 20, that is, the gasket 2 is directly formed by folding the same piece of material during the production of the movable contact spring 20, without riveting. Preferably, the size of the spacer 2 only covers the contact position on the movable reed 20, that is, the position of the mounting hole of the movable reed 20, so that the pertinence is higher, and the influence on the movement flexibility required by the movable reed 20 can be reduced.

In this embodiment, the gasket 2 is provided with a U-shaped notch, the lengths of two sides of the U-shaped notch are different, and the two elastic arms 11 are portions extending from the ends of two sides of the U-shaped notch to the other side respectively in an inclined manner, so as to ensure that the gasket 2 and the elastic arm set 1 are integrally formed, and facilitate processing. Of course, in other embodiments, the gasket 2 may be a block structure, and the elastic arm 11 may be an arm integrally extending from the block structure in an outward inclined manner, which is not limited herein.

Alternatively, in other embodiments, the movable contact spring 20 is formed by a plurality of stacked spring plates, and the elastic arm set 1 is directly disposed on one spring plate farthest from the movable contact 30, which is not limited herein.

Example two

Referring to fig. 9 to 10, the electromagnetic relay provided by the present utility model also includes an electromagnetic system 100, a contact system 200, a base 300, and a push card 400. The second embodiment is substantially the same as the first embodiment in that the number of the elastic arms 11 of the elastic arm group 1 is set differently. In this embodiment, a set of elastic arm groups 1 are respectively disposed on two sides of the pad 2, and the number of the elastic arms 11 of each set of elastic arm groups 1 is three, so that the three elastic arms 11 are respectively a first elastic arm 111, a second elastic arm 112 and a third elastic arm 113: the first elastic arm 111 and the second elastic arm 112 have the same inclination direction, but different inclination angles, the inclination direction of the third elastic arm 113 is opposite to the inclination direction of the first elastic arm 111 and the second elastic arm 112, and the third elastic arm 113 is respectively crossed with the first elastic arm 111 and the second elastic arm 112, so that each elastic arm 11 is abutted against the base 300 in the breaking process of the movable contact 30 and the fixed contact 60, and the elastic arm 11 generates elastic deformation to correspondingly consume the kinetic energy of the movable spring 20 so as to slow down the movable spring 20, thereby achieving the buffering and vibration damping effects; and the three mutually crossed elastic arms 11 can fully utilize the effective space, so that the arm length of the elastic arms 11 is longer, the flexibility is increased, the elastic deformation quantity of the elastic arms 11 is increased, and the vibration reduction effect is improved.

Further, the highest point of the three elastic arms 11 gradually decreases from the highest point to the end of the driven reed 20 at the vertical height of the driven reed 20 to the middle position; specifically, the vertical height of the first elastic arm 111, the terminal end of which is closest to the end of the movable contact spring 20, is the largest among the three, the terminal end of which is second closest to the second elastic arm 112 of the end of the movable contact spring 20, and the vertical height of the third elastic arm 113, the terminal end of which is farthest from the end of the movable contact spring 20, is the smallest. In the breaking process of the movable contact 30 and the fixed contact 60, the first elastic arm 111 is firstly abutted against the base 300, and the rebound speed of the movable reed 20 is slowed down by the elastic deformation of the first elastic arm 111, and the kinetic energy of the movable reed 20 is effectively consumed, so that the vibration reduction in the first stage is realized; then, the second elastic arm 112 is abutted against the base 300, and the kinetic energy of the movable reed 20 is further consumed through the elastic deformation of the second elastic arm 112, so that the vibration reduction of the second stage is realized; finally, the third elastic arm 113 is abutted against the base 300, and the kinetic energy of the movable reed 20 is further consumed by the elastic deformation of the third elastic arm 113, so that the vibration reduction of the third stage is realized, and the effect of three-stage vibration reduction is achieved.

In the present embodiment, the start end of the third elastic arm 113 is closer to the end of the movable reed 20, and the start ends of the first elastic arm 111 and the second elastic arm 112 are closer to the middle position of the movable reed 20. In this way, in the breaking process of the movable contact 30 and the fixed contact 60, the structure of the gasket 2 riveted on the back of the movable contact 30 can increase the rigidity of the head of the movable reed 20 to help breaking, and the further reverse crossed elastic arm group 1 integrated with the gasket 2 can exert the effect of flexible vibration reduction; in addition, the first elastic arm 111 and the second elastic arm 112 act on the end of the movable reed 20 at a position relatively close to the middle of the movable reed 20, and then the third elastic arm 113 acts on the end of the movable reed 20 to firstly damp the position close to the middle, and then further transition to the head to damp the position, so that the damping and stopping effects are better.

While the utility model has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the utility model as defined by the appended claims.

Claims (10)

1. A movable contact assembly, characterized by: the movable contact is arranged on one surface of the movable contact spring so as to be correspondingly matched with the fixed contact of the fixed contact assembly; the vibration reduction structure comprises at least one group of elastic arms, wherein the elastic arms comprise at least two elastic arms, one side, close to the movable reed, of each elastic arm is used as a starting end, and the other side, far away from the movable reed, of each elastic arm is used as a terminal end; at least two elastic arms in the elastic arm group incline from the initial end to the terminal end, and the inclination directions of the two elastic arms are opposite so as to enable the two elastic arms to mutually intersect; when the movable contact is contacted with the fixed contact, a certain distance is reserved between the highest point of the elastic arm group and the base of the relay; when the movable contact and the fixed contact are separated, the elastic arms of the elastic arm group are abutted with the base of the relay to perform vibration reduction.

2. The movable contact assembly of claim 1, wherein: and the elastic arms of each elastic arm group are subjected to gradual vibration reduction from the end part of the movable reed to the middle part.

3. The movable contact assembly of claim 2, wherein: the vertical height from the highest point of a plurality of elastic arms of each elastic arm group to the movable reed gradually decreases from the end part to the middle part of the movable reed.

4. The movable contact assembly of claim 1, wherein: the vibration reduction structure comprises a gasket, one surface of the gasket is attached to the tail part of the upper contact of the movable contact, the surface of the gasket is far away from the movable contact, the elastic arm group is arranged on the other surface of the gasket, and when the movable contact and the fixed contact are separated, the gasket and the elastic arm group act together to reduce vibration.

5. The movable contact assembly of claim 4, wherein: the gasket is provided with a U-shaped notch, the lengths of the two sides of the U-shaped notch are different, and the elastic arms which are mutually intersected in the elastic arm group are parts which extend obliquely from the end parts of the two sides of the U-shaped notch to the other side respectively.

6. The movable contact assembly of claim 1, wherein: the number of the elastic arm groups is two, and the elastic arm groups are respectively arranged on two corresponding sides of the movable reed along the width direction or the length direction.

7. The movable contact assembly of claim 1, wherein: the elastic arms extend along the length direction of the movable reed, wherein the initial end of one elastic arm which is firstly in butt joint with the base of the relay in the two elastic arms which are mutually intersected is closer to the middle position of the movable reed, and the initial end of the other elastic arm is closer to the end part of the movable reed.

8. The movable contact assembly of claim 1, wherein: the terminal of the elastic arm is provided with a bending part, the bending part bends towards the side where the movable reed is located, and the highest point of the elastic arm is located at the bending part of the bending part.

9. The movable contact assembly of claim 1, wherein: the movable reed is composed of a plurality of reeds which are laminated together, and the vibration reduction structure is arranged on one reed which is farthest from the movable contact.

10. An electromagnetic relay, characterized in that: comprising a contact system and a base for receiving the contact system; the contact system comprises a movable contact assembly and a stationary contact assembly, the movable contact assembly being as claimed in any one of the preceding claims 1-9.