CN216528703U - Suction-assisting type under-voltage tripping mechanism - Google Patents

Abstract

The utility model discloses a suction-assisting type under-voltage tripping mechanism which comprises a base, a coil, a static iron core, a movable iron core and a driving assembly positioned outside the coil, wherein the driving assembly comprises a moving piece and a linkage piece, the moving piece can be arranged on the base in a relatively moving mode along a first direction, the first direction is parallel to the axial direction of the coil, the moving piece is provided with a first position and a second position on the base, the linkage piece can be arranged on the base in a relatively rotating mode around a first rotating center line, the extending direction of the first rotating center line is perpendicular to the first direction, the linkage piece is provided with a first portion and a second portion which are respectively arranged on two different sides of the first rotating center line, the first portion is arranged in a matched mode with the movable iron core, and the driving assembly further comprises an elastic piece used for providing acting force required by the moving piece from the second position to the first position. The suction-assisting type under-voltage tripping mechanism is simple and reliable in structure, higher in safety, capable of omitting the use of a control circuit board, low in production cost and simple to install.

Description

Suction-assisting type under-voltage tripping mechanism

Technical Field

The utility model relates to the field of electrical protection devices, in particular to a suction-assisting type under-voltage tripping mechanism.

Background

The circuit breaker is an electric appliance which not only has the function of manual switch, but also can automatically carry out the protection of voltage loss, undervoltage, overload, short circuit and the like. The breaker can be used for distributing electric energy, starting an asynchronous motor infrequently, protecting a power supply circuit, the motor and the like, and automatically cutting off a circuit when faults of serious overload, short circuit, undervoltage and the like occur.

In order to realize the undervoltage protection function of the circuit breaker, an undervoltage release is often required to be installed and used in the circuit breaker. The under-voltage release is a release which makes the breaker have time delay or no time delay disconnection when the power voltage is reduced to a set range. The coil of the undervoltage release is connected to the power supply side of the circuit breaker, the circuit breaker can be switched on after the undervoltage release is electrified, and otherwise, the circuit breaker cannot be switched on. The working process of the undervoltage release is as follows: when the voltage of a power supply is reduced or insufficient, a push rod of the undervoltage release props against a draw bar or a release half shaft on the operating mechanism, so that the operating mechanism is in an unlocking state and cannot store energy for switching on, and the circuit breaker is also in a switching-off state, so that a load electric appliance or electrical equipment below the circuit breaker is prevented from being damaged by undervoltage; when the coil of the undervoltage release obtains enough voltage, the push rod moves away from the draw bar or the tripping half shaft along with the attraction action of the undervoltage release, namely, the push rod retreats from the motion trail of the draw bar or the tripping half shaft, so that the circuit breaker can be normally switched on and switched off.

The existing undervoltage release comprises a release body and a control circuit, wherein the control circuit part is mainly a control circuit board with functions of low-voltage sampling, information processing and the like, the undervoltage release body and the control circuit board are respectively arranged inside a circuit breaker, and the undervoltage protection function of the circuit breaker is realized by matching the undervoltage release with an operating mechanism inside the circuit breaker. Because release body and control scheme board separately install inside the circuit breaker separately to connect through many circuits, the two required installation space is great, and the installation wiring is loaded down with trivial details mixed and disorderly, and it is comparatively troublesome to install, influences product performance, and has increased product cost. In addition, the control circuit board is fragile in structure, easy to burn due to overheating and short in service life.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a suction-assisting type under-voltage tripping mechanism which does not need a control circuit board, has a simple structure and reliable functions, and aims to overcome the defects in the prior art.

In order to achieve the purpose, the utility model adopts the technical scheme that:

a suction-assisting type under-voltage tripping mechanism comprises a base, a coil arranged on the base, a static iron core and a movable iron core which are arranged in the coil, wherein the static iron core is fixedly arranged on the base, the movable iron core can be arranged on the base along the axial direction of the coil in a relative motion manner, the under-voltage tripping mechanism further comprises a driving assembly positioned outside the coil, the driving assembly comprises a moving piece and a linkage piece, the moving piece can be arranged on the base along a first direction in a relative motion manner, the first direction is parallel to the axial direction of the coil, the moving piece is provided with a first position and a second position on the base, the linkage piece can be arranged on the base in a relative rotation manner around a first rotation center line, the extension direction of the first rotation center line is perpendicular to the first direction, and the linkage piece is provided with a first part and a second part which are respectively arranged on two sides of the first rotation center line, which are different from each other, the first part is matched with the movable iron core, when the moving part is positioned at the first position, the moving part is matched with the second part, and the movable iron core and the static iron core are arranged at intervals along the axial direction of the coil; when the moving piece is located at the second position, the moving piece is disengaged from the second part, and the movable iron core is in contact with and abutted against the static iron core; the drive assembly further includes a resilient member for providing a force required to move the moving member from the second position toward the first position.

Preferably, the moving member has a convex portion, when the moving member is located at the first position, the convex portion abuts against the second portion to limit the moving member to move to the second position, and the first portion cooperates with the movable iron core to limit the movable iron core to move towards the stationary iron core.

Further preferably, the convex part has an arc surface, the second part has an avoiding surface and an abutting surface which extend outwards from the first rotation center line in sequence, an included angle between the avoiding surface and the abutting surface is larger than 180 degrees and smaller than or equal to 270 degrees, and when the moving part is located at the first position, the arc surface is abutted to the abutting surface in a matched mode.

Preferably, the undervoltage tripping mechanism further includes a rotating member, the rotating member is disposed on the base in a manner of relatively rotating around a second rotation center line, the second rotation center line is parallel to the first rotation center line, the rotating member has a pushing portion and a matching portion respectively disposed on two opposite sides of the second rotation center line, the matching portion is connected to the moving member in a manner of relatively moving along a second direction, the second direction is perpendicular to the first direction, and the second direction is perpendicular to the extending direction of the first rotation center line.

Further preferably, the moving member is provided with a fitting groove extending along the second direction, and the fitting portion is relatively slidably and/or rollably inserted in the fitting groove.

Further preferably, the matching part is a cylinder, and the axis of the cylinder is parallel to the second rotation center line; and/or the matching part can be arranged on the rotating member in a manner of relative rotation around a third rotation central line, and the third rotation central line is parallel to the second rotation central line.

Preferably, the driving assembly further comprises a connecting rod extending along the axial direction of the coil, the connecting rod is fixedly arranged on the movable iron core, a boss is fixedly arranged on the connecting rod, and the first portion abuts against one side, close to the movable iron core, of the boss.

Further preferably, the first portion has a notch, and the connecting rod is inserted into the notch.

Preferably, the driving assembly further comprises a connecting rod extending along the axial direction of the coil, the connecting rod is fixedly arranged on the movable iron core, a guide groove is formed in the static iron core, and the connecting rod can penetrate through the guide groove along the axial direction in a relative sliding mode.

Preferably, the base comprises a housing with an inner cavity and a mounting seat fixedly arranged outside the housing, and the coil, the stationary iron core and the movable iron core are all arranged in the inner cavity; the driving assembly is arranged on the mounting seat, a guide opening is formed in the mounting seat, the moving piece is provided with a guide portion, and the guide portion can be relatively slidably inserted into the guide opening along the first direction.

Due to the application of the technical scheme, the suction-assisting type under-voltage tripping mechanism provided by the utility model has the advantages of simple and reliable structure, small volume, capability of performing a reliable under-voltage tripping function, no automatic conduction after voltage recovery, higher safety, capability of omitting the use of a control circuit board, reduction in production cost and simplicity in installation.

Drawings

In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description of the embodiments will be briefly described below.

Fig. 1 is a schematic perspective view of a suction-assisting under-voltage tripping mechanism according to an embodiment of the present invention;

fig. 2 is a schematic perspective view of the under-voltage trip mechanism of the present embodiment at another angle;

fig. 3 is a partial perspective view of the undervoltage trip mechanism of the present embodiment with a portion of the structure omitted;

fig. 4 is a schematic perspective view of the under-voltage trip mechanism of fig. 3 at another angle;

FIG. 5 is a perspective view of the mounting base of the present embodiment;

FIG. 6 is a perspective view of the moving member of the present embodiment;

FIG. 7-1 is a perspective view of a linkage member in the present embodiment;

FIG. 7-2 is a perspective view of another angle of the linkage member in the present embodiment;

FIG. 8 is a perspective view of the rotary member in the present embodiment;

FIG. 9 is a schematic view of the movable iron core and the connecting rod of the present embodiment;

fig. 10 is a schematic side view of the undervoltage trip mechanism of the present embodiment with a portion of the base omitted, wherein the moving member is in a first position;

FIG. 11 is a schematic front view of the undervoltage trip mechanism of FIG. 10 with the coil omitted;

fig. 12 is a side view of the under-voltage trip mechanism of the present embodiment with a portion of the base omitted and with the moving member in a second position;

FIG. 13 is a schematic front view of the undervoltage trip mechanism of FIG. 12 with the coil omitted;

wherein: 110. a housing; 110a, an inner cavity; 111. a first hole; 112. a second hole; 113. an installation table; 120. a mounting seat; 121. a guide port; 130. a connecting seat;

210. a coil; 220. a stationary iron core; 230. a movable iron core;

310. a moving member; 311. a convex portion; 312. a mating groove; 313. a guide portion; 320. a linkage member; 321. a first part; 3211. a notch; 322. a second section; 3221. an avoidance surface; 3222. an abutting surface; 3223. an extension plane; 323. a rotating part; 324. a first shaft; 330. an elastic member; 340. a rotating member; 341. a pushing part; 342. a fitting portion; 343. a second shaft; 350. a connecting rod; 351. a boss; 352. a limiting table;

1001. a first rotational centerline; 1002. a second center of rotation; 1003. a shaft axis; x, a first direction; y, a second direction; z, third direction.

Detailed Description

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the advantages and features of the utility model may be more readily understood by those skilled in the art.

Referring to fig. 1 and 2, the suction-assisted type under-voltage tripping mechanism can be installed in a circuit breaker to realize the under-voltage protection function. The undervoltage tripping mechanism comprises a base, and a coil 210, a static iron core 220, a movable iron core 230, a driving component and the like which are arranged on the base.

In this embodiment, the under-voltage tripping mechanism itself is used as a reference to establish a coordinate system shown in the drawing, which includes a first direction X, a second direction Y, and a third direction Z that are perpendicular to each other two by two. When the undervoltage tripping mechanism is actually used, the first direction X may be the up-down direction shown in the figure, or the undervoltage tripping mechanism may be integrally rotated, so that the first direction X is a horizontal direction or an inclined direction, that is, the specific orientation of the undervoltage tripping mechanism is not limited in the present invention. Only the orientation relationship in the drawings will be described below.

Referring to fig. 1 and 2, the base includes a housing 110, a mounting seat 120 and a connecting seat 130 fixed to each other. The housing 110 has an inner cavity 110a, and the coil 210, the stationary core 220, the movable core 230, and the like are accommodated in the inner cavity 110 a. The housing 110 is disposed on the sidewalls of the two sides of the first direction X and is respectively provided with a first hole 111 and a second hole 112. Referring to fig. 3 and 4, a side wall of the housing 110 having the second hole 112 is further provided with a mounting table 113 extending in the second direction Y. A mounting seat 120 is provided at a side of the housing 110 having the mounting table 113 for mounting each driving assembly. The connecting seat 130 is disposed outside the mounting seat 120, and is used for connecting the under-voltage tripping mechanism with external structures such as a circuit breaker.

Referring to fig. 1, 9, 11 and 13, the coil 210 is connected to an external circuit, the axial direction of the coil 210 is parallel to the first direction X, and the stationary core 220 and the movable core 230 are disposed in the coil 210. The stationary core 220 is fixedly disposed in the housing 110 and located at one side of the first direction X, and the movable core 230 is disposed in the housing 110 and located at the other side of the first direction X and capable of moving relatively along the axial direction of the coil 210. In this embodiment, the driving assembly includes a connecting rod 350 extending along the axial direction of the coil 210, the connecting rod 350 is disposed through and fixed on the movable core 230, and two ends of the connecting rod 350 extend out of the movable core 230. The stationary core 220 is provided with a guide groove penetrating along the first direction X, and the connecting rod 350 can be relatively slidably inserted into the guide groove along the axial direction thereof, so as to provide a guide for the movable core 230 to slide up and down. The coil 210, the stationary core 220, the movable core 230 and the connecting rod 350 preferably extend coaxially to facilitate uniform stress, two ends of the connecting rod 350 respectively extend to the outside of the housing 110 through the first hole 111 and the second hole 112 of the housing 110, wherein a limiting table 352 is fixedly arranged on one end penetrating through the first hole 111, and a boss 351 is fixedly arranged on one end penetrating through the second hole 112, so as to limit the relative movement of the movable core 230.

Referring to fig. 3 to 10, the driving assembly further includes a moving member 310, a link member 320, an elastic member 330, a rotating member 340, and the like. Wherein the moving member 310 is disposed on the mount 120 to be relatively movable in the first direction X. In this embodiment, both sides of the moving element 310 have protruding guiding portions 313, the mounting seat 120 has guiding openings 121 formed on both corresponding sides, and the guiding portions 313 on each side can be relatively slidably inserted into the guiding openings 121 on the same side along the first direction X, so as to achieve sliding guiding of the moving element 310. Further, one end of the moving element 310 has a convex portion 311, and one side surface of the convex portion 311 is a cambered surface. The moving member 310 further has a fitting groove 312 formed on one side thereof and extending in the second direction Y.

In this embodiment, the moving element 310 has a first position shown in fig. 10 and a second position shown in fig. 12 on the base, and the elastic element 330 is embodied as a compression spring connected between the moving element 310 and the mounting platform 113 for providing the force required for moving the moving element 310 from the second position to the first position.

Referring to fig. 4, 7-1 and 7-2, the linkage member 320 is integrally formed in a sheet shape and may be formed by integrally or separately processing metal plates. The link 320 can be arranged on the mount 120 via the first shaft 324 so as to rotate relative to one another about a first rotation center axis 1001, the first rotation center axis 1001 extending in the third direction Z. The link 320 includes a first portion 321 and a second portion 322 respectively disposed on two different sides of the first rotation center line 1001, and two sets of rotation portions 323 extending from a connection portion of the first portion 321 and the second portion 322 to the same side, and the first shaft 324 is simultaneously inserted through the two sets of rotation portions 323.

In this embodiment, the overall extending direction of the first portion 321 and the second portion 322 forms an included angle of about 90 °. The outer end of the first portion 321 is provided with a semicircular notch 3211, the shape of the notch 3211 is matched with the cross section of the connecting rod 350, so that the connecting rod 350 can be embedded into the notch 3211 from one side of the second direction Y, and then the connecting rod 350 can pass through the notch 3211 to relatively slide along the axial direction of the connecting rod, and the assembling method is simple and the structure is reliable. The first portion 321 abuts on a side of the boss 351 close to the plunger 230. As such, the first portion 321 can push the boss 351 downward to move away from the stationary core 220, and the boss 351 can push the first portion 321 upward to move toward the stationary core 220.

The second portion 322 has an extending surface 3223, an avoiding surface 3221 and an abutting surface 3222 extending outward from between the two sets of rotating portions 323 in sequence, and the extending surface 3223, the avoiding surface 3221 and the abutting surface 3222 are all located on one side of the second portion 322 facing the moving element 310. Referring to fig. 10, an included angle between the extending surface 3223 and the avoiding surface 3221 is greater than 90 ° and less than 180 ° (i.e., an obtuse angle), and an included angle between the avoiding surface 3221 and the abutting surface 3222 is greater than 180 ° and less than or equal to 270 °. In this way, the second portion 322 is a folded plate with two folding angles, which can cooperate with the rotation of the link member 320 and the linear movement of the moving member 310, so that the protrusion 311 will abut against the abutting surface 3222 and form a mutual limit only when the moving member 310 is at the first position.

Referring to fig. 1, 3 and 8, the rotating member 340 can be relatively rotatably disposed on the mounting base 120 about a second rotation center line 1002 through a second shaft 343, and the rotating member 340 is disposed at one side of the moving member 310, and the second rotation center line 1002 is parallel to the first rotation center line 1001. The rotating member 340 has a pushing portion 341 and a matching portion 342 respectively disposed on two different sides of the second rotation center line 1002, and the pushing portion 341 and the matching portion 342 are also respectively disposed on two different sides of the rotating member 340 along the second direction Y, so as to be capable of matching with different components. The matching part 342 in this embodiment is a cylinder protruding towards the moving part 310, and the axis 1003 of the cylinder is parallel to the second rotation center line 1002; in other embodiments, the fitting portion 342 may be a cylinder that can relatively rotate around the axis 1003, and the cylinder may be a prism, an elliptic cylinder, or the like, which is not limited to a cylinder. The fitting portion 342 is further inserted in the fitting groove 312 of the mover 310 in the second direction Y to be relatively slidable. Therefore, when the rotating member 340 rotates around the second rotation center line 1002, the engaging portion 342 can convert its own rotation motion into a linear motion of the moving member 310 along the first direction X, so as to drive the moving member 310 to switch between the first position and the second position.

On the other hand, the pushing portion 341 is used to cooperate with a push rod of a circuit breaker (not shown in the figure), so that when the push rod is manually pushed, the rotating member 340 can be linked to rotate, and the on-off of the under-voltage tripping mechanism can be manually controlled.

The working principle of the suction-assisting type under-voltage tripping mechanism in the embodiment is specifically described as follows:

referring to fig. 10 and 11, when the moving element 310 is located at the first position, the elastic element 330 is in a released state to push up the moving element 310, and at this time, the arc surface of the convex portion 311 abuts against the abutting surface 3222 of the link 320 and exerts a certain pressure on each other, so that the link 320 cannot rotate freely, and the first portion 321 abuts against the boss 351 to limit the upward movement of the connecting rod 350 and the movable iron core 230, so that the movable iron core 230 and the stationary iron core 220 are arranged at a distance in the axial direction of the coil 210.

At this time, if the coil 210 is energized and has sufficient current to generate a sufficient magnetic field, a magnetic attraction force is generated between the movable iron core 230 and the stationary iron core 220, but the magnetic attraction force at this distance is not sufficient to overcome the supporting force between the convex portion 311 and the abutting surface 3222, so that the movable iron core 230 and the stationary iron core 220 cannot be automatically attracted.

Therefore, it is required to manually push the push rod of the circuit breaker, so that the push portion 341 rotates upward around the second rotation center line 1002, and the engagement portion 342 rotates downward accordingly, so that the engagement portion 342 abuts against the engagement groove 312 and pushes the moving member 310 to move to the second position along the first direction X. The external pushing force in this process overcomes both the supporting force between the protrusion 311 and the abutting surface 3222 and the elastic force of the elastic member 330. After the convex portion 311 is disengaged from the abutting surface 3222, the linking member 320 can rotate around the first rotation center line 1001, and under the action of the magnetic attraction force, the connecting rod 350 moves upward along with the movable iron core 230, so that the boss 351 can move upward along with the first portion 321, and the second portion 322 rotates downward along with the boss.

Referring to fig. 12 and 13, when the moving element 310 is located at the second position, the protruding portion 311 is located in a groove defined by the abutting surface 3222 and the avoiding surface 3221, and the movable iron core 230 contacts and abuts against the stationary iron core 220 and is attracted together by the magnetic attraction force. After the external force is removed, the movable core 230 and the stationary core 220 can still be engaged, so that the movable member 310 is maintained at the second position.

That is, in the energized state with normal voltage, the movable core 230 and the stationary core 220 are attracted, the elastic member 330 is compressed, and the movable member 310 is maintained at the second position.

Until the external voltage is unstable, an undervoltage condition occurs, the current in the coil 210 weakens, so that the magnetic field weakens, the movable iron core 230 and the stationary iron core 220 can no longer be effectively attracted, at this time, the pushing force of the elastic member 330 is enough to push the movable member 310 to move upwards, the protrusion 311 contacts the second portion 322 and moves along the avoiding surface 3221 and the abutting surface 3222 during the ascending process of the movable member 310, so as to push the linkage member 320 to rotate around the first rotation center line 1001, the first portion 321 relatively descends and abuts against the boss 351 to move downwards together, so as to drive the movable iron core 230 to move away from the stationary iron core 220, and the undervoltage tripping mechanism returns to the state shown in fig. 10 and 11, so that the circuit breaker is tripped.

In conclusion, the suction-assisting type under-voltage tripping mechanism of the embodiment has the advantages of simple structure and reliable performance, can omit the use of a control circuit board, and effectively reduces the production cost.

The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims (10)

1. The utility model provides an assist and inhale formula under-voltage tripping device, includes the base, sets up coil on the base, and set up quiet iron core in the coil with move the iron core, quiet iron core set firmly in on the base, it can follow to move the iron core the axial relative motion ground of coil sets up on the base its characterized in that: the undervoltage tripping mechanism also comprises a driving assembly positioned outside the coil, the driving assembly comprises a moving piece and a linkage piece, wherein,

the moving member is provided on the base so as to be relatively movable in a first direction parallel to an axial direction of the coil, the moving member having a first position and a second position on the base,

the linkage piece can be arranged on the base in a manner of relative rotation around a first rotation center line, the extension direction of the first rotation center line is perpendicular to the first direction, the linkage piece is provided with a first part and a second part which are respectively arranged at two different sides of the first rotation center line, the first part is arranged in a manner of being matched with the movable iron core,

when the moving element is located at the first position, the moving element is matched with the second part, and the moving iron core and the static iron core are arranged at intervals along the axial direction of the coil; when the moving piece is located at the second position, the moving piece is disengaged from the second part, and the movable iron core is in contact with and abutted against the static iron core; the drive assembly further includes a resilient member for providing a force required to move the moving member from the second position toward the first position.

2. The suction-assisted under-voltage trip mechanism of claim 1, wherein: the moving part is provided with a convex part, when the moving part is located at the first position, the convex part abuts against the second part to limit the moving part to move to the second position, and the first part is matched with the movable iron core to limit the movable iron core to move towards the static iron core.

3. The suction-assisted under-voltage trip mechanism of claim 2, wherein: the convex part has an arc surface, the second part has an avoidance surface and a support surface which sequentially extend outwards from the first rotating center line, the avoidance surface and the support surface form an included angle larger than 180 degrees and smaller than or equal to 270 degrees, and when the moving part is located at the first position, the arc surface is supported against the support surface in a matched mode.

4. The suction-assisted under-voltage trip mechanism of claim 1, wherein: the under-voltage tripping mechanism further comprises a rotating part, the rotating part can be arranged on the base in a relatively rotating mode around a second rotating center line, the second rotating center line is parallel to the first rotating center line, the rotating part is provided with a pushing part and a matching part which are respectively arranged on two opposite sides of the second rotating center line, the matching part can be connected with the moving part in a relatively moving mode along a second direction, the second direction is perpendicular to the first direction, and the second direction is perpendicular to the extending direction of the first rotating center line.

5. The suction-assisted under-voltage trip mechanism of claim 4, wherein: the moving piece is provided with a matching groove extending along the second direction, and the matching part can be relatively inserted into the matching groove in a sliding and/or rolling manner.

6. The suction-assisted under-voltage trip mechanism of claim 4, wherein: the matching part is a cylinder, and the axis of the cylinder is parallel to the second rotating central line; and/or the matching part can be arranged on the rotating member in a manner of relative rotation around a third rotation central line, and the third rotation central line is parallel to the second rotation central line.

7. The suction-assisted under-voltage trip mechanism of claim 1, wherein: the driving assembly further comprises a connecting rod extending along the axial direction of the coil, the connecting rod is fixedly arranged on the movable iron core, a boss is fixedly arranged on the connecting rod, and the first portion is abutted against one side, close to the movable iron core, of the boss.

8. The suction-assisted under-voltage trip mechanism of claim 7, wherein: the first portion has a notch, and the connecting rod is arranged in the notch in a penetrating mode.

9. The suction-assisted under-voltage trip mechanism of claim 1, wherein: the driving assembly further comprises a connecting rod extending along the axial direction of the coil, the connecting rod is fixedly arranged on the movable iron core, a guide groove is formed in the static iron core, and the connecting rod can penetrate through the guide groove along the axial direction in a relative sliding mode.

10. The suction-assisted under-voltage trip mechanism according to any one of claims 1 to 9, wherein: the base comprises a shell with an inner cavity and a mounting seat fixedly arranged outside the shell, and the coil, the static iron core and the movable iron core are all arranged in the inner cavity; the driving assembly is arranged on the mounting seat, a guide opening is formed in the mounting seat, the moving piece is provided with a guide portion, and the guide portion can be inserted into the guide opening in a relatively sliding mode along the first direction.

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