CN116403863A - Matching structure of movable reed and movable reed leading-out piece and electromagnetic relay - Google Patents
Matching structure of movable reed and movable reed leading-out piece and electromagnetic relay Download PDFInfo
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- CN116403863A CN116403863A CN202310495227.7A CN202310495227A CN116403863A CN 116403863 A CN116403863 A CN 116403863A CN 202310495227 A CN202310495227 A CN 202310495227A CN 116403863 A CN116403863 A CN 116403863A
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- 230000000694 effects Effects 0.000 claims description 2
- 230000013011 mating Effects 0.000 claims 8
- 230000005611 electricity Effects 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 12
- 230000008569 process Effects 0.000 abstract description 10
- 230000009471 action Effects 0.000 abstract description 9
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H50/00—Details of electromagnetic relays
- H01H50/54—Contact arrangements
- H01H50/56—Contact spring sets
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H50/00—Details of electromagnetic relays
- H01H50/14—Terminal arrangements
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Abstract
The invention provides a matching structure of a movable reed and a movable reed leading-out sheet, wherein the movable reed and the movable reed leading-out sheet are used in an electromagnetic relay, the movable reed is electrically connected with the movable reed leading-out sheet, the movable reed can be deformed under the action of a driving force so as to lead the electromagnetic relay to be connected, grooves are formed on two sides of the movable reed so as to form two movable reed small arms, the driving force acts on the movable reed small arms on the two sides, and the movable reed small arms on the two sides are bent towards the direction opposite to the driving force direction. In the initial state, the small arms at the two sides and the middle reed form certain dislocation, so that the stroke waste caused by the motion lag of the middle arm reed in the whole movable reed closing process is compensated, and the coil power consumption is reduced. The two side arms of the movable spring leading-out sheet are provided with the convex parts, and the bent two side movable spring small arms are abutted against the movable spring leading-out sheet through the convex parts and generate pre-pressure, so that the push clamping idle stroke of a product is ensured, and the product is ensured to be reliably attracted on the premise of not increasing power consumption.
Description
Technical Field
The invention relates to the field of electromagnetic relays, in particular to a matching structure of a movable reed and a movable reed leading-out piece.
Background
Electromagnetic relays generally include a base, a housing, a magnetic circuit portion including a bobbin, an enamel wire, an iron core, a yoke, and an armature, a moving spring portion, and a stationary spring portion. The movable spring part comprises a movable reed, a contact and a movable reed leading-out sheet, and the static spring part comprises a contact and a static reed. The movable spring part, the static spring part and the locating piece are arranged on the base, and a cavity is arranged on the base and used for placing the magnetic circuit part to form isolation with the contact system.
The existing double-slotting scheme of the movable reed can effectively solve the problem of secondary suction of products and improve the long-service life of the products. Because the two sides of the movable spring are grooved, the two sides are softer. Therefore, in the actual movement process, a deformation process exists on two sides of the movable reed, and the movable reed is deformed to a certain extent and then drives the middle reed to move together. Therefore, at the moment of contact, the reed of the main arm of the movable spring and the small arms at the two sides have a stroke waste (as shown in figures 1a-1b: the distance between the small arms at the two sides and the middle reed is staggered). A larger armature travel is required to compensate for this wasted travel and to ensure a subsequent overstroke of the product. A larger armature travel is detrimental to product pull-in and even means that greater coil power consumption is required.
In addition, in order to ensure better reliable and consistent attraction of products, the prior proposal of the matching design of the movable reed and the pushing card generally leaves a pushing card idle stroke S (as shown in figures 2a-2 b), and a starting speed is obtained through the idle stroke at the moment of armature starting to push the card to impact the movable reed, so that the products are easier to attract.
The defect that coil power consumption is wasted due to overlarge armature stroke exists in the matched design of the movable reed and the pushing card in the existing scheme.
Disclosure of Invention
Therefore, the invention provides a matching structure of a movable reed and a movable reed leading-out sheet and an electromagnetic relay.
The invention is realized by the following scheme:
the invention provides a matching structure of a movable reed and a movable reed leading-out sheet, wherein the movable reed is electrically connected with the movable reed leading-out sheet, and the movable reed can deform under the action of a driving force, and is characterized in that: the movable reed comprises a movable reed main arm provided with a movable contact and a movable reed pushing arm connected with the movable reed main arm, and the movable reed is configured to act on the movable reed pushing arm through driving force to drive the movable reed main arm to move towards the fixed contact, wherein the movable reed pushing arm is applied with a pre-bending in a direction opposite to the driving force direction.
In one embodiment, the movable spring leading-out piece is provided with a limiting part, and the limiting part can be abutted against the movable spring pushing arm, so that the limiting part can reversely limit deformation caused by bending the movable spring pushing arm in advance.
In one embodiment, the limiting portion is a protrusion disposed at a proper position on two sides of the movable spring leading-out piece, and the movable spring pushing arm after being bent in advance is abutted against the movable spring leading-out piece through the protrusion and generates pre-compression force.
In one embodiment, the limiting portion is a widened portion formed by widening the movable spring leading-out piece at proper positions of two side edges, and the movable spring pushing arm after being bent in advance is abutted against the movable spring leading-out piece through the widened portion and generates pre-pressing force.
In one embodiment, the limiting portion is a heightening portion formed by heightening a base portion of the movable spring leading-out piece, and the movable spring pushing arm after being bent in advance is abutted against the movable spring leading-out piece through the heightening portion and generates pre-pressing force.
In one embodiment, the pre-bending degree is such that when the movable spring pushing arm is deformed to be level with the movable spring main arm due to the action of the driving force, the movable spring main arm is driven to move towards the stationary contact.
In one embodiment, the movable spring main arm and the movable spring pushing arm are isolated by a movable spring groove formed in the movable spring.
In one embodiment, two moving spring grooves are formed on two sides of the moving spring so as to form two moving spring pushing arms, and the moving spring main arm is arranged between the two moving spring pushing arms.
In one embodiment, a slot is arranged in the middle of the movable spring leading-out sheet, the slot is used for keeping the position of the contact rod, and the movable spring leading-out sheet forms two side arms at the slot; the width of the slot is narrow at the upper part and wide at the lower part, the lower part of the slot is a width gradual change part, the upper part of the slot is a rectangular part, and the width gradual change part is connected with the rectangular part.
The invention also provides an electromagnetic relay which comprises the matching structure of the movable reed and the movable reed leading-out piece, a fixed contact and a pushing mechanism, wherein the pushing mechanism acts on the movable reed pushing arm.
Wherein, in one embodiment, the pushing mechanism and the movable spring pushing arm have an idle stroke therebetween.
The technical scheme provided by the invention has the following technical effects:
1. the movable reed is provided with grooves at two sides, and the movable reed pushes the movable arm to bend in the opposite direction to the movement of the reed. In the initial state, the movable spring pushing arms and the movable spring main arms at the two sides form certain dislocation firstly, so that the stroke waste caused by the motion lag of the movable spring main arms in the whole movable spring closing process is made up, and the coil power consumption is reduced.
2. The bent two side movable spring pushing arms are limited and supported by the movable spring leading-out piece to resist dislocation deformation formed in advance. The spring is provided with elastic potential energy in advance, so that stroke waste caused by motion lag of the main arm of the spring is avoided, dislocation deformation of the movable spring pushing arms on two sides is eliminated due to limit of the movable spring leading-out piece of the movable spring, the pushing idle stroke is influenced, and the pushing idle stroke of a product is ensured, so that reliable suction of the product is ensured on the premise of not increasing power consumption.
Drawings
FIG. 1a is a front view of an electromagnetic relay of the prior art with contacts just touching; FIG. 1b is an enlarged view of FIG. 1a at A;
fig. 2a is a front view of a prior art electromagnetic relay with an empty stroke S between a push clip and a moving spring push arm when not activated; FIG. 2B is an enlarged view of FIG. 2a at B;
FIG. 3 is an assembled electromagnetic relay assembly diagram;
FIG. 4a is a side view of a movable contact spring with two opposite movable contact spring arms, FIG. 4b is a front view of a movable contact spring with two opposite movable contact spring arms, FIG. 4C is an enlarged view of FIG. 4a at C;
FIG. 5 is a front view of the movable spring lead-out tab;
FIG. 6a is a side view of the assembled movable reed and movable reed tab, and FIG. 6b is a front view of the assembled movable reed and movable reed tab;
FIG. 7 is a front view of the moving spring pull-out tab with a protrusion;
FIG. 8a is a side view of a movable reed assembled with a movable reed tab with a protrusion, and FIG. 8b is a front view of a movable reed assembled with a movable reed tab with a protrusion;
FIG. 9 is a front view of a movable reed assembled with a movable reed extension in another embodiment;
fig. 10 is a front view of a movable spring assembled with a movable spring tab according to another embodiment.
Detailed Description
For further illustration of the various embodiments, the invention 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 invention. The components in the figures are not drawn to scale and like reference numerals are generally used to designate like components.
The invention will now be further described with reference to the drawings and detailed description.
Example 1
Referring to fig. 3-6b, the present embodiment provides an electromagnetic relay including a contact system 100, a magnetic circuit system 200, a base 300, and a push card 400. The contact system 100 comprises a static spring part 110 and a dynamic spring part 120, wherein the static spring part 110 and the dynamic spring part 120 are fixed on a base 300 in a plug-in manner; the movable spring part 120 comprises a movable spring 130 and a movable spring leading-out sheet 140, and a leading-out terminal is arranged on the movable spring leading-out sheet 140; the movable contact 131 is arranged on the movable reed 130, the movable contact 131 comprises a contact cap 132 and a contact rod 133, and the movable contact 131 is riveted on the movable reed 130 through the contact rod 133; the stationary spring part 110 includes a stationary contact and a stationary reed having a lead-out terminal; the lead terminals of the movable spring part 120 and the stationary spring part 110 are used for connection with external lines to be controlled. The magnetic circuit 200 includes a coil 230 formed by winding an enameled wire on a bobbin 240, the coil 230 is sleeved on a structure formed by the iron core 220 and the yoke 250, and forms a magnetic circuit with the armature 210, and the magnetic circuit 200 is mounted in a cavity of the base 300. The armature 210 is connected to the pusher card 400, and the pusher card 400 can abut against the movable spring 130.
When the electromagnetic relay performs a closing action, the coil 230 is electrified, magnetic force is generated in the magnetic loop, the armature 210 is attracted by the magnetic force, so that the push card 400 is pushed to translate towards the movable reed 130, the movable reed 130 abutted against the push card 400 is elastically deformed due to the translation of the push card 400, the movable contact 131 on the movable reed 130 is contacted with the static contact on the static reed, and the circuit is conducted; when the electromagnetic relay is disconnected, the coil 230 is powered off, no magnetic force is generated in the magnetic circuit, the armature 210 is released, the movable spring 130 is not pushed by the push card 400, the movable spring 130 is released to swing back, so that the movable contact 131 on the movable spring 130 is separated from the static contact on the static spring, and the circuit is disconnected.
Referring to fig. 4a to 4c, in order to facilitate deformation of the movable reed 130 and thus facilitate closing action of the electromagnetic relay, two movable reed grooves 134 are provided on the movable reed 130, and the movable reed 130 forms two movable reed pushing arms 135 via the two movable reed grooves 134. Between the two moving spring pushing arms 135 is a moving spring main arm 136. The magnetic circuit 200 and the pusher card 400 can act as a pushing mechanism on the moving spring pushing arm 135.
In order to make the contact between the movable contact 131 on the movable reed 130 and the stationary contact on the stationary reed more stable when the electromagnetic relay is closed, the push card 400 generally has an over-stroke, that is, after the translation of the push card 400 makes the movable contact 131 on the movable reed 130 contact with the stationary contact on the stationary reed, there is still enough redundancy in the stroke of the push card 400.
Alternatively, the number of the movable spring grooves 134 and the movable spring pushing arms 135 may be one or more, the movable spring 130 may form a movable spring pushing arm 135 through one movable spring groove 134, and the movable spring pushing arm 135 may be a cantilever or a ring arm around the movable spring main arm 136 (not shown). The number and configuration of the movable spring pushing arms 135 may be different to adapt to the structures of the corresponding assembling parts of the pushing card 400 of different types. For example, when the assembling portion of the push card 400 and the movable spring pushing arm 135 is located at the middle upper end, the movable spring pushing arm 135 may be configured in a form of a ring arm wound around the movable spring main arm 136.
Alternatively, movable contact 131 can be attached to one face of movable contact spring 130 in other ways known to those skilled in the art, including welding, integral molding, etc.
The movable reed 130 can deform under the action of driving force to switch on the electromagnetic relay, and movable reed grooves 134 are formed on two sides of the movable reed 130 to form two movable reed pushing arms 135, and the two movable reed pushing arms 135 are of a cantilever structure; the driving force acts on the both side moving spring pushing arms 135, and the both side moving spring pushing arms 135 are applied with a pre-bending in a direction opposite to the driving force direction; alternatively, the pre-bending position may be set at a root position near the cantilever structure of the movable spring pushing arm 135; the driving force for driving the deformation of the movable reed 130 is provided by the translation of the pusher card 400. The pre-bent two side movable spring pushing arms 135 and the movable spring main arms 136 form a certain dislocation in the thickness direction of the movable spring 130, as shown in fig. 4a-4 c. When the push card 400 translates and pushes the moving spring push arm 135, deformation stress is generated between the moving spring push arm 135 and the moving spring main arm 136 and gradually increases. Preferably, the pre-bending degree is such that when the movable spring pushing arm 135 deforms to be level with the movable spring main arm 136, the deformation stress is increased enough to drive the movable spring main arm 136 to move towards the stationary contact, so that the stroke waste caused by the motion lag of the movable spring main arm 136 in the whole closing process of the movable spring 130 is effectively reduced, and the coil power consumption is further reduced.
Referring to fig. 6a-6b, movable reed 130 is riveted to movable reed-extracting tab 140, thereby achieving electrical connection between movable reed 130 and movable reed-extracting tab 140. However, those skilled in the art will recognize that the connection between the movable reed 130 and the movable reed drawing sheet 140 is not limited to the riveting method, and any connection method that allows the movable reed 130 and the movable reed drawing sheet 140 to have sufficient mechanical connection strength and enable the electrical connection may be used in the present embodiment, such as welding.
Example 2
Referring to fig. 7-8b, in the embodiment 1, in the present embodiment, the protrusions 143 are provided at appropriate positions on two sides of the movable spring pull-out piece 140, and the movable spring pushing arms 135 on two sides after being bent in advance can be abutted against the movable spring pull-out piece 140 through the protrusions 143 as the limiting portions, so that the movable spring pushing arms 135 on two sides of the movable spring 130 are limited. The pre-bent movable spring pushing arm 135 easily falls back to abut against the pushing card 400, so as to generate a force on the pushing card 400, and influence the starting action of the pushing card 400, i.e. the armature 210 needs to overcome the force when the power is initially applied. Therefore, the limit of the movable spring pushing arms 135 at the two sides of the movable spring 130 can solve the problem of falling back of the movable spring pushing arms 135, and ensure that the pushing clamp of the product has enough idle stroke. Due to the existence of the idle stroke, a starting speed is obtained through the idle stroke at the starting moment of pushing the pushing card 400 by the armature 15, so that the pushing card is pushed to push the movable spring 130, the armature is easier to suck when the electromagnetic relay product is closed, and the electromagnetic relay is easier to perform closing action.
Since the previously bent two side moving spring pushing arms 135 and the moving spring main arm 136 are offset from each other in the thickness direction of the moving spring 130, the two side moving spring pushing arms 135 are limited by the moving spring drawing piece 140, and then the two side moving spring pushing arms 135 are abutted against the moving spring drawing piece 140 to generate pre-compression force. Preferably, the two side moving spring pushing arms 135 are abutted against the moving spring lead-out piece 140 so that the moving spring pushing arms 135 are deformed to a flush position with the moving spring main arm 136. At this time, there is a deformation stress between the moving spring pushing arm 135 and the moving spring main arm 136; when the push card 400 translates against the movable spring push arm 135 and applies a force to the movable spring push arm 135, the deformation stress between the movable spring push arm 135 and the movable spring main arm 136 increases enough to drive the movable spring main arm 136 of the movable spring 130 to move towards the stationary contact, thereby effectively reducing the stroke waste of the push card 400.
That is, in embodiment 2, the elastic potential energy is preset in the pre-bent movable spring pushing arm 135 of the movable spring 130 to avoid the stroke waste caused by the motion lag of the movable spring main arm 136, and the limit of the movable spring 130 by the movable spring guiding piece 140 eliminates the influence of the pre-bending of the movable spring pushing arm 135 on the idle stroke of the pushing card 400, and the combination of the bending structure of the movable spring 135 and the limit convex part of the guiding piece 140 solves the problem of the motion lag stroke waste, and further ensures the idle stroke of the pushing card 400 of the product, thereby ensuring that the product can still be reliably attracted without increasing the power consumption.
Alternatively, the two sides of the moving spring guide-out piece 140 are not provided with the convex portions 143, but the following alternative arrangement is provided:
alternatively, referring to fig. 9, the movable spring lead-out piece 140 is widened at appropriate positions on two sides to form widened portions 145, and the width of the widened portions of the two side arms 142 is enough to enable the pre-bent movable spring pushing arms 135 on two sides to abut against the movable spring lead-out piece 140 as limiting portions through the widened portions 145, so that the movable spring pushing arms on two sides of the movable spring 130 are limited.
Alternative arrangement, referring to fig. 10, the bottom 146 of the movable spring lead-out tab 140 has a raised portion 144, and the raised portion 144 is configured such that the movable spring pushing arms 135 on two sides after being bent in advance can be abutted against the movable spring lead-out tab 140 as a limiting portion through the raised portion 144, so that the movable spring pushing arms on two sides of the movable spring 130 are limited.
Example 3
The difference between this embodiment and embodiment 2 is that, referring to fig. 7-10, in this embodiment, a slot 141 is provided in the middle of the moving spring pull-out piece 140, and the moving spring pull-out piece 140 forms two side arms 142 at the slot 141. The slot 141 may be created by any suitable machining means for slot forming including, but not limited to, blanking, wire cutting, laser cutting; the top end of the slot 141 can be abutted against the convex rib structure at the top of the base 300 (as shown in fig. 3 and 7), so that the stability of the assembly of the movable spring leading-out piece 140 is facilitated, the reliability of the movable spring leading-out piece 140 is maintained after the electromagnetic relay acts for a plurality of times, and the fixation of the movable spring leading-out piece 140 is more stable. The slot 141 unseats the contact bar 133. The upper portion of the slot 141 is rectangular, and the width of the lower portion is gradually widened so that the slot 141 is in the form of being narrow at the upper portion and wide at the lower portion. It should be noted that, the top end of the slot 141 may be provided with a process notch 147 at each of left and right positions based on the process requirement, and the process notch 147 is only provided to accommodate the requirement of the bending process of the movable spring leading-out piece 140, and should not be considered as actually influencing or changing the shape and size of the slot 141. The rectangular slot width of the upper portion of the slot 141 is smaller than the diameter width of the contact cap 132 on the movable contact 130 and larger than the diameter width of the riveted contact lever 133 on the movable contact 130.
The moving spring guide piece 140 has two side arms 142 formed at a lower portion of the slot 141 having a gradually widened width, and the two side arms 142 are respectively inclined to the left and right. And the inclination degree of the two side arms 142 is enough that a part of the two side arms 142 is just placed at the movable spring groove 134 of the movable spring 130 and is not contacted with the movable spring 130, so that the overlapping area between the two side arms 142 and the movable spring 130 is smaller, namely, a larger staggering space is formed between the two side arms 142 and the movable spring 130. Moreover, the width of the slot at the two side arms 142 is gradually increased from top to bottom, and compared with the vertical arrangement of the two side arms 142, the slot space is larger in the embodiment. In the use process of the electromagnetic relay, a certain probability of high temperature occurs at the movable contact 131, at the moment of switching on or switching off the electromagnetic relay, the high temperature can cause splashes to splash out of the movable contact 131, the splashes normally fall in the height direction, because a larger staggered space exists between the two side arms 142 of the movable spring leading-out piece 140 and the movable spring 130, and the movable spring leading-out piece 140 has a larger slotting space, if the splashes are blocked at the higher position of the joint position of the movable spring 130 and the movable spring leading-out piece 140, the bottom of the splashes falling after the secondary action is the staggered position between the two side arms 142 and the movable spring 130 or the slotting position of the movable spring leading-out piece 140, so that the splashes slide out onto the base 300. The arrangement of this embodiment can minimize the accumulation of splashes generated during use between the movable reed 130 and the movable reed drawing tab 140.
While the invention 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 invention as defined by the appended claims.
Claims (11)
1. The utility model provides a movable reed and cooperation structure of movable reed draw forth piece, movable reed with movable reed draw forth piece electricity and be connected, movable reed can receive the effect of driving force and take place deformation, its characterized in that: the movable reed comprises a movable reed main arm provided with a movable contact and a movable reed pushing arm connected with the movable reed main arm, and the movable reed is configured to act on the movable reed pushing arm through driving force to drive the movable reed main arm to move towards the fixed contact, wherein the movable reed pushing arm is applied with a pre-bending in a direction opposite to the driving force direction.
2. The mating structure of claim 1, wherein: the movable spring leading-out sheet is provided with a limiting part, and the limiting part can be abutted against the movable spring pushing arm, so that the limiting part can reversely limit deformation caused by bending the movable spring pushing arm in advance.
3. The mating structure of claim 2, wherein: the limiting part is a convex part arranged on two side edges of the movable spring leading-out sheet, and the movable spring pushing arm after being bent in advance is abutted on the movable spring leading-out sheet through the convex part and generates pre-pressure.
4. The mating structure of claim 2, wherein: the limiting part is a widened part formed by widening the movable spring leading-out sheet on two side edges, and the movable spring pushing arm after being bent in advance is abutted on the movable spring leading-out sheet through the widened part and generates pre-pressure.
5. The mating structure of claim 2, wherein: the limiting part is a heightening part formed by heightening the base part of the movable spring leading-out sheet, and the movable spring pushing arm which is bent in advance is abutted against the movable spring leading-out sheet through the heightening part and generates precompression.
6. The mating structure of claim 1, wherein: the degree of bending in advance makes the movable spring pushing arm receives the driving force and deforms to with the movable spring main arm parallel and level, the movable spring main arm is driven towards the stationary contact and moves.
7. The mating structure of claim 1, wherein: the movable spring main arm is isolated from the movable spring pushing arm through a movable spring groove formed in the movable spring.
8. The mating structure of claim 7, wherein: two movable spring grooves are formed in two sides of the movable spring so as to form two movable spring pushing arms, and a movable spring main arm is arranged between the two movable spring pushing arms.
9. The mating structure according to any one of claims 3-5, wherein: a slot is arranged in the middle of the movable spring leading-out sheet, the movable contact comprises a contact cap and a contact rod, and the movable contact is riveted on the movable spring through the contact rod; the position of the grooved abdication contact rod is narrow in the upper part and wide in the lower part of the grooved, the lower part of the grooved is a width gradual change part, the upper part of the grooved is a rectangular part, and the width gradual change part is connected with the rectangular part.
10. An electromagnetic relay, characterized by comprising: the movable contact and movable spring lead-out piece matching structure of any one of claims 1 to 9, a stationary contact and a pushing mechanism, wherein the pushing mechanism acts on the movable spring pushing arm.
11. The electromagnetic relay of claim 10 wherein: when the matching structure of the movable reed and the movable reed leading-out sheet is the matching structure of the movable reed and the movable reed leading-out sheet according to any one of claims 2 to 5 and 9, an idle stroke is formed between the pushing mechanism and the movable reed pushing arm.
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CN202310495227.7A CN116403863A (en) | 2023-05-05 | 2023-05-05 | Matching structure of movable reed and movable reed leading-out piece and electromagnetic relay |
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CN202310495227.7A CN116403863A (en) | 2023-05-05 | 2023-05-05 | Matching structure of movable reed and movable reed leading-out piece and electromagnetic relay |
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CN202310495227.7A Pending CN116403863A (en) | 2023-05-05 | 2023-05-05 | Matching structure of movable reed and movable reed leading-out piece and electromagnetic relay |
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