Relay contact moving structure

Abstract

The utility model discloses a relay contact moving structure, which comprises a moving contact frame movably connected with a driving rod and a moving contact fixed on the moving contact frame, and is characterized in that the moving contact frame comprises two clamping plates oppositely clamping the moving contact, a locking assembly fixedly connected with the two clamping plates, and a positioning structure arranged between the two clamping plates and the moving contact; according to the technical scheme, contact pressure needed by contact is provided for the movable contact and the static contact through elastic deformation of the spring piece, and when the movable contact and the static contact are in closed contact, the driving rod continues to do over-travel motion relative to the movable contact frame by compressing the spring piece. A certain contact overtravel is provided for contact movement of the relay, so that elastic force of the spring piece can be utilized for buffering when the contacts are closed to avoid bouncing and shaking of the contacts, it can be guaranteed that the moving contacts and the static contacts can still keep certain contact pressure after electrical abrasion, and the electrical service life of the contacts is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of low-voltage electrical appliances, in particular to a relay contact movement structure. Background Art

[0002] A latching relay is an electronic control device that performs functions such as automatic regulation, safety protection, and circuit switching in circuits. Its normally closed or normally open state is entirely dependent on the action of a permanent magnet, and its switching state is triggered by a pulsed electrical signal of a certain width. With the national initiative for energy conservation and environmental protection, latching relays are gradually replacing conventional electromagnetic relays and are widely used in power protection, automation, motion control, remote control, measurement, and communications.

[0003] An existing magnetic latching relay includes a housing, an electromagnetic mechanism, a push block, and a main contact assembly for conducting or disconnecting an external main circuit. The electromagnetic mechanism is connected to a push rod through an armature. The main contact assembly includes a static spring and a dynamic spring relatively inserted into the housing. The static spring is provided with a static contact, and the dynamic spring is provided with a dynamic contact. The push rod is driven by the electromagnetic mechanism to reciprocate, so that the push rod drives the dynamic spring and the static spring to achieve extrusion contact or separation, thereby realizing the disconnection or closing between the dynamic contact and the static contact. The contact pressure is provided by the elastic deformation of the dynamic and static springs through extrusion, but long-term use will cause elastic fatigue or even deformation of the spring, which may easily cause the dynamic and static springs to shake during the contact process, thereby causing arcing and adhesion between the contacts, affecting the product's overcurrent capacity and performance. Utility Model Content

[0004] The technical problem to be solved by the present invention is to overcome the problem in the prior art that the dynamic and static reeds of the relay are prone to bouncing and shaking during the contact process, which may cause the dynamic and static contacts to stick together and shorten the service life of the contacts.

[0005] In order to solve the above technical problems, the utility model provides a relay contact movement structure, including a driving rod driven by an electromagnetic mechanism to move back and forth, a moving contact frame movably connected to the driving rod, and at least one moving contact fixed to the moving contact frame and cooperating with the static contact, the moving contact frame including two clamping plates that clamp the moving contacts in opposite directions and a locking assembly that fixedly connects the two clamping plates, and a positioning structure arranged between the two clamping plates and the moving contact for maintaining the relative positions of the two clamping plates and the moving contact, the two clamping plates are correspondingly provided with movable holes for connecting the driving rod, and a spring member is arranged between the driving rod and the moving contact frame, so that the driving rod moves relative to the moving contact frame by compressing the spring member when the moving contact contacts the static contact.

[0006] As a preferred solution, the positioning structure includes at least one clamping hole arranged between the two clamping plates, and a positioning block arranged in the clamping hole to form a positioning match with the moving contact. The two ends of the clamping hole are respectively extended to the upper and lower side positions of the two clamping plates. The moving contact is inserted into the clamping hole and is provided with a positioning hole 1 that cooperates with the positioning block.

[0007] As a preferred solution, the positioning block is arranged on the inner side surface of one of the clamps facing the moving contact, and the other clamp is correspondingly provided with a positioning hole 2 opposite to the positioning hole 1, so that the positioning block is passed through the positioning hole 1 and the positioning hole 2.

[0008] As a preferred solution, the locking assembly includes two locking plates arranged on the outer sides of the two clamps facing each other, and at least one set of locking members passing through the two locking plates and the two clamps. When the locking members are fixed, they apply a fastening force to the two locking plates to press the two clamps toward each other.

[0009] As a preferred solution, two strip-shaped grooves are respectively provided on the outer side surfaces of the two clamping plates along the length direction of the clamping plates, and the two locking plates are matched and accommodated in the two strip-shaped grooves and cover the second positioning hole.

[0010] As a preferred solution, the locking assembly includes two locking pieces arranged at both ends of one of the splints, and two locking platforms or two locking grooves correspondingly arranged at both ends of the other splint, and the locking pieces are engaged with the locking platforms or locking grooves.

[0011] As a preferred solution, the two clamping plates are vertically connected to the driving rod, and the two locking plates are respectively provided with a through hole for one end of the driving rod to pass through.

[0012] As a preferred solution, one end of the driving rod passing through the movable hole is provided with a first limiting member, and the first limiting member cooperates and abuts against one of the clamping plates or one of the locking plates.

[0013] As a preferred solution, the spring member is a conical spring sleeved on the driving rod, and the driving rod is provided with a second limit member limited to one end of the conical spring, and the other end of the conical spring with a larger diameter cooperates and abuts against the other clamping plate or the other locking plate.

[0014] As a preferred embodiment, the electromagnetic mechanism includes a magnetic yoke, a coil structure, a moving iron core and a permanent magnet. The magnetic yoke surrounds the coil structure, the permanent magnet is arranged between the coil structure and the magnetic yoke, the moving iron core is movably arranged in the inner cavity of the coil structure, and the driving rod is linked to the moving iron core.

[0015] The technical solution of the utility model has the following advantages over the prior art:

[0016] 1. In the relay contact movement structure provided by the present invention, the movable contact frame includes two relatively fixed clamping plates, and the movable contact is clamped and fixed between the two clamping plates through a positioning structure, thereby realizing the linkage between the movable contact frame and the movable contact, and the movable contact frame and the driving rod are elastically connected by a spring member, so that the driving rod drives the movable contact frame to make reciprocating movements to realize the contact or separation of the movable contact and the static contact. The movable contact and the static contact used in this technical solution are both rigid structural designs, which do not produce deformation themselves, but provide contact for the movable and static contacts through the elastic deformation of the spring member. The required contact pressure, when the moving and static contacts are closed and in contact, causes the driving rod to continue to overtravel relative to the moving contact frame through the compression spring member, providing a certain contact overtravel for the contact movement of the relay, thereby applying continuous pressure on the moving contact to press on the static contact, ensuring the stability and reliability of the contact between the moving and static contacts. In this way, the elastic force of the spring member can be used as a buffer when the contacts are closed to avoid contact bouncing and jittering, and it can also ensure that the moving and static contacts can still maintain a certain contact pressure after electrical wear, thereby increasing the electrical life of the contacts, thereby improving the overcurrent capacity and performance of the relay.

[0017] 2. In the relay contact movement structure provided by the present invention, the moving contact is installed in the clamping hole formed by the two clamping plates. A positioning block is provided on one of the clamping plates. During installation, the positioning block first passes through the positioning hole 1 on the moving contact and then passes through the positioning hole 2 on the other clamping plate. The advantage of this arrangement is that it can not only realize the rapid positioning and installation between the two clamping plates, but also realize the positioning and installation of the moving contact in the clamping hole to prevent the moving contact from being displaced or even detached from between the two clamping plates, thereby realizing the positioning of the two clamping plates and the moving contact to form a whole. This installation structure of the moving contact and the moving contact frame is simple and the positioning is more precise, which is conducive to improving the installation efficiency. The overall structure is more compact, and the electrical performance of the product is guaranteed.

[0018] 3. In the relay contact movement structure provided by the present invention, after the two clamping plates and the moving contact are positioned and assembled, the two locking plates arranged on both sides of the back of the two clamping plates are fastened together by the locking piece, so that the two locking plates press the two clamping plates toward each other and firmly fix the two clamping plates together to prevent the two clamping plates from loosening. In this way, the installation and fixation between the two clamping plates are achieved, the installation force is stable, and the fit and fixation are reliable.

[0019] 4. In the relay contact movement structure provided by the present invention, the spring member is a conical spring sleeved on the driving rod, and a second limit member is provided on the moving rod to limit one end of the conical spring, so that the two ends of the conical spring respectively abut against the second limit member and the clamping plate of the moving contact frame, thereby realizing the positioning installation of the conical spring between the driving rod and the moving contact frame to prevent the conical spring from positional displacement, so that the direction of the elastic force of the conical spring is consistent with the movement mode of the driving rod, and the conical spring can transmit motion and force between the driving rod and the moving contact frame, and provide elastic pressure for the moving and static contacts to maintain close contact when elastically deformed under pressure, so as to improve the contact effect between the moving and static contacts and maintain good contact of the contacts. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific implementation of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the specific implementation or the description of the prior art.

[0021] Figure 1 A schematic diagram of the structure of the relay contact motion structure provided by the utility model;

[0022] Figure 2 This is a schematic cross-sectional view of the contact motion structure of the relay of the present invention;

[0023] Figure 3 This is a schematic diagram of the connection structure between the driving rod and the moving contact frame of the utility model;

[0024] Figure 4 for Figure 3 Schematic diagram of the split structure of the driving rod and the moving contact frame;

[0025] Figure 5 This is a schematic structural diagram of the positioning structure of the utility model on the movable contact frame.

[0026] Explanation of the accompanying symbols: 1. driving rod; 2. moving contact frame; 21. clamping plate; 22. movable hole; 23. strip groove; 3. moving contact; 4. spring member; 5. positioning structure; 51. clamping hole; 52. positioning block; 53. positioning hole 1; 54. positioning hole 2; 6. locking plate; 61. locking member; 6 / 2, fixing hole; 7. first limiting member; 8. second limiting member; 9. electromagnetic mechanism; 91. yoke; 92. coil structure; 93. moving iron core; 94. permanent magnet DETAILED DESCRIPTION

[0027] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0028] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0030] Example

[0031] This embodiment provides Figure 1-5 The relay contact movement structure described herein includes a driving rod 1 driven by an electromagnetic mechanism 9 to move back and forth, a moving contact frame 2 movably connected to the driving rod 1, and at least one moving contact 3 fixed to the moving contact frame 2 and cooperating with the static contact, the moving contact frame 2 including two clamping plates 21 that clamp the moving contact 3 toward each other and a locking assembly that fixedly connects the two clamping plates 21, as well as a positioning structure 5 arranged between the two clamping plates 21 and the moving contact 3 for maintaining the relative position of the two clamping plates 21 and the moving contact 3, the two clamping plates 21 are correspondingly provided with movable holes 22 for connecting the driving rod 1, a spring member 4 is provided between the driving rod 1 and the moving contact frame 2, and an elastic connection relationship is formed between the driving rod 1 and the moving contact frame 2 by the spring member 4, and in the process of the driving rod 1 driving the moving contact frame 2 to move, the moving contact 3 is brought into contact or separation with the static contact, wherein, when the moving contact 3 contacts the static contact, the driving rod 1 continues to move a certain distance relative to the moving contact frame 2 by compressing the spring member 4.

[0032] In the above embodiment, the moving contact 3 is clamped and fixed between the two clamping plates 21 by the positioning structure 5, thereby realizing the linkage between the moving contact frame 2 and the moving contact 3, and the moving contact frame 2 and the driving rod 1 are elastically connected by the spring member 4, so that the driving rod 1 drives the moving contact frame 2 to make reciprocating movements to realize the contact or separation of the moving contact 3 and the static contact. The moving contact 3 and the static contact used in this technical solution are both rigid structural designs, which do not produce deformation themselves, but provide the contact pressure required for contact for the moving and static contacts through the elastic deformation of the spring member 4. When the moving When the static contact is closed, the drive rod 1 continues to overtravel relative to the moving contact frame 2 through the compression spring part 4, providing a certain contact overtravel for the contact movement of the relay, thereby applying continuous pressure on the static contact to the moving contact 3, ensuring the stability and reliability of the contact between the moving and static contacts. In this way, the elastic force of the spring part 4 can be used for buffering when the contacts are closed to avoid contact bouncing and jittering, and it can also ensure that the moving and static contacts can still maintain a certain contact pressure after electrical wear, thereby increasing the electrical life of the contacts and thus improving the overcurrent capacity and performance of the relay.

[0033] The following combination Figure 2-5 The specific setting method of the positioning structure is described in detail:

[0034] The positioning structure 5 includes at least one clamping hole 51 arranged between the two clamping plates 21, and a positioning block 52 arranged in the clamping hole 51 to form a positioning match with the moving contact 3. The two ends of the clamping hole 51 extend respectively at the upper and lower side positions of the two clamping plates 21. The moving contact 3 is inserted into the clamping hole 51 and is provided with a positioning hole 53 that cooperates with the positioning block 52. The positioning hole 53 is set through both sides of the moving contact 3, and the positioning block 52 cooperates with the positioning hole 1 53 to position and install the moving contact 3 in the clamping hole 51. The positioning block 52 is set on the inner side surface of one of the clamping plates 21 facing the moving contact 3, and the other clamping plate 21 is correspondingly provided with a positioning hole 2 54 opposite to the positioning hole 1 53, so that the positioning block 52 is passed through the positioning hole 1 53 and the positioning hole 2 54. With this structural setting, during installation, the moving contact 3 is installed in the clamping hole 51 formed by the two clamping plates 21, and the positioning block 52 first passes through the positioning hole 1 53 on the moving contact 3, and then passes into the positioning hole 2 54 on the other clamping plate 21. The advantage of this setting is that it can not only achieve rapid positioning and installation between the two clamping plates 21, but also achieve positioning and installation of the moving contact 3 in the clamping hole 51 to prevent the moving contact 3 from positional displacement or even separation from between the two clamping plates 21, thereby achieving the positioning of the two clamping plates 21 and the moving contact 3 to form a whole. This installation structure of the moving contact 3 and the moving contact frame 2 is simple, and the positioning is more precise, which is conducive to improving installation efficiency. The overall structure is more compact, and the electrical performance of the product is guaranteed.

[0035] The following combination Figure 1-4 The specific setting method of the locking component is described in detail:

[0036] The locking assembly includes two locking plates 6 arranged on the outer sides of the two clamps 21 facing each other, and at least one set of locking parts 61 passing through the two locking plates 6 and the two clamps 21. When the locking parts 61 are fixed, the two locking plates 6 apply a fastening force to press the two clamps 21 toward each other. The locking parts 61 are locking screws, and the two clamps 21 and the two locking plates 6 are respectively provided with fixing holes 62 that cooperate with the locking parts 61, or the locking screws are passed through the fixing holes 62 and tightened with nuts, so that the two locking plates are fastened together by the locking screws; the outer side surfaces of the two clamps 21 are respectively provided with two strip grooves 23 extending along the length direction of the clamps 21, and the two locking plates 6 are matched and accommodated in the two strip grooves 23 and cover the positioning hole 2 54, so that the hidden installation of the positioning block 52 and the positioning hole position can be realized, and the locking plates are positioned and connected through the strip grooves. With this structural arrangement, after the two clamps 21 are positioned and assembled with the moving contact 3, the two locking plates 6 arranged on both sides of the back of the two clamps 21 are fastened together by the locking piece 61, so that the two locking plates 6 press the two clamps 21 toward each other and firmly fix the two clamps 21 together to prevent the two clamps 21 from loosening, thereby achieving installation and fixation between the two clamps 21, stable installation force, and reliable fit and fixation.

[0037] As an alternative to the above-mentioned locking assembly, the movable contact frame can also be directly fixed by two clamping plates 21. The specific configuration is as follows: the locking assembly includes two locking members provided at both ends of one clamping plate 21, and two locking platforms or two locking grooves provided at both ends of the other clamping plate 21. The locking members cooperate with the locking platforms or locking grooves to engage with each other. During installation, when the two clamping plates 21 are aligned and assembled together, the locking members can also achieve a fixed connection between the two clamping plates 21 by engaging with the locking platforms or locking grooves. Those skilled in the art can make a choice of the specific configuration of the locking assembly based on the above description, and will not be described in detail here.

[0038] In this embodiment, combined with Figure 2-4As shown, two locking plates 6 are provided on both sides of the dynamic contact frame 2 to compress and fix the two clamping plates 21, so that the two clamping plates 21 are arranged between the two locking plates 6, and the two clamping plates 21 are vertically connected to the driving rod 1, and the two locking plates 6 are respectively provided with movable holes for one end of the driving rod 1 to pass through, that is, the movable holes are axially penetrated through the two locking plates and the two clamping plates, wherein, one end of the driving rod 1 passing through the movable hole is provided with a first limiting member 7, and the first limiting member 7 cooperates and abuts against one of the clamping plates 21, or the first limiting member 7 abuts against one of the locking plates. This arrangement enables the first limiting member 7 and the spring member 4 to be respectively connected to both sides of the dynamic contact frame 2, and the first limiting member 7 can prevent the dynamic contact frame 2 from detaching from one end of the driving rod 1 under the action of the spring force, so as to play a limiting role.

[0039] It is further preferred that the spring member 4 is a tower-shaped spring sleeved on the driving rod 1, and the driving rod 1 is provided with a second limit member 8 limited to one end of the tower-shaped spring, and the other end of the tower-shaped spring with a larger diameter cooperates to abut against the other clamping plate 21 or the other locking plate 6, so that the two ends of the tower-shaped spring respectively abut against the second limit member 8 and the dynamic contact frame 2, thereby realizing the positioning installation of the tower-shaped spring between the driving rod 1 and the dynamic contact frame 2 to prevent the tower-shaped spring from positionally shifting, so that the direction of the elastic force of the tower-shaped elasticity is consistent with the movement mode of the driving rod 1, the first limit member 7 and the second limit member 8 are preferably a retaining spring structure, which can transmit motion and force between the driving rod 1 and the dynamic contact frame 2 through the tower-shaped spring, and provide elastic pressure for the moving and static contacts to maintain close contact when elastically deformed under pressure, so as to enhance the contact effect between the moving and static contacts and maintain good contact of the contacts.

[0040] The relay provided in this embodiment is a magnetic latching relay for use in a charging pile, comprising an electromagnetic mechanism 9, a moving contact frame 2, a moving contact 3, a static contact and a terminal assembly arranged in a shell, the electromagnetic mechanism 9 comprising a yoke 91, a coil structure 92, a moving iron core 93 and a permanent magnet, the yoke 91 being a closed structure and forming a configuration surrounding the coil structure 92, the coil structure 92 comprising a coil skeleton and a wire package, the iron core structure being movably arranged in the inner cavity of the coil structure 92, the driving rod 1 extending into the inner cavity of the coil structure 92 and being linked to the moving iron core 93, the coil structure 92 of this magnetic latching relay changes the current by The direction and size of the magnetic field can change the direction of the magnetic field. Therefore, the moving iron core 93 is subjected to the two opposite magnetic field forces generated by the coil structure 92 to make reciprocating motion, and drives the moving contact 3 on the moving contact frame 2 to contact or separate with the static contact through the driving rod 1. The permanent magnet 94 is arranged between the coil structure 92 and the yoke 91. When the moving contact is in contact with the static contact, the moving iron core 93 is held at one end of the yoke 91 under the action of the permanent magnet; and when the moving contact is separated from the static contact, the moving iron core 93 is held at the other end of the yoke 91 under the action of the permanent magnet, thereby realizing the magnetic holding function of the relay that keeps the contacts connected or disconnected when the coil is powered off.

[0041] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A relay contact movement structure, comprising a drive rod (1) driven by an electromagnetic mechanism (9) to reciprocate, a movable contact frame (2) movably connected to the drive rod (1), and at least one movable contact (3) fixed to the movable contact frame (2) and cooperating with a stationary contact, characterized in that: The movable contact frame (2) comprises two clamping plates (21) for clamping the movable contact (3) toward each other, a locking assembly for fixedly connecting the two clamping plates (21), and a positioning structure (5) arranged between the two clamping plates (21) and the movable contact (3) for maintaining the relative positions of the two clamping plates (21) and the movable contact (3). The two clamping plates (21) are respectively provided with movable holes (22) for connecting the driving rod (1). A spring member (4) is arranged between the driving rod (1) and the movable contact frame (2), so that the driving rod (1) moves relative to the movable contact frame (2) by compressing the spring member (4) when the movable contact (3) contacts the static contact.

2. The relay contact motion structure according to claim 1, characterized in that: The positioning structure (5) includes at least one clamping hole (51) arranged between two clamping plates (21), and a positioning block (52) arranged in the clamping hole (51) and forming a positioning match with the moving contact (3). The two ends of the clamping hole (51) are respectively extended and arranged at the upper and lower side positions of the two clamping plates (21). The moving contact (3) is inserted into the clamping hole (51) and is provided with a positioning hole (53) that matches the positioning block (52).

3. The relay contact motion structure according to claim 2, characterized in that: The positioning block (52) is arranged on the inner side surface of one of the clamping plates (21) facing the moving contact (3), and the other clamping plate (21) is correspondingly provided with a second positioning hole (54) opposite to the first positioning hole (53), so that the positioning block (52) is inserted into the first positioning hole (53) and the second positioning hole (54).

4. The relay contact motion structure according to any one of claims 1 to 3, characterized in that: The locking assembly comprises two locking plates (6) arranged on the outer sides of the two clamping plates (21) facing each other, and at least one set of locking members (61) passing through the two locking plates (6) and the two clamping plates (21). When the locking members (61) are fixed, they apply a fastening force to the two locking plates (6) to press the two clamping plates (21) toward each other.

5. The relay contact motion structure according to claim 4, characterized in that: The outer side surfaces of the two clamping plates (21) are respectively provided with two strip grooves (23) extending along the length direction of the clamping plates (21); the two locking plates (6) are matched and accommodated in the two strip grooves (23) and cover the second positioning hole (54).

6. The relay contact motion structure according to any one of claims 1 to 3, characterized in that: The locking assembly comprises two locking members arranged at both ends of one of the clamping plates (21), and two locking platforms or two locking grooves correspondingly arranged at both ends of the other clamping plate (21), wherein the locking members are engaged with the locking platforms or locking grooves.

7. The relay contact motion structure according to claim 4, characterized in that: The two clamping plates (21) are vertically connected to the driving rod (1), and the two locking plates (6) are respectively provided with movable holes (22) for one end of the driving rod (1) to pass through.

8. The relay contact motion structure according to claim 7, characterized in that: One end of the driving rod (1) passing through the movable hole is provided with a first limiting member (7), and the first limiting member (7) is in contact with one of the clamping plates (21) or one of the locking plates (6).

9. The relay contact motion structure according to claim 8, characterized in that: The spring member (4) is a conical spring sleeved on the driving rod (1). The driving rod (1) is provided with a second limiting member (8) limited to one end of the conical spring. The other end of the conical spring with a larger diameter cooperates with and abuts against the other clamping plate (21) or the other locking plate (6).

10. The relay contact motion structure according to claim 1, characterized in that: The electromagnetic mechanism (9) comprises a magnetic yoke (91), a coil structure (92), a moving iron core (93) and a permanent magnet (94); the magnetic yoke (91) surrounds the coil structure (92); the permanent magnet (94) is arranged between the coil structure (92) and the magnetic yoke (91); the moving iron core (93) is movably arranged in the inner cavity of the coil structure (92); and the driving rod (1) is linked to the moving iron core (93).

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