CN219626577U - Cutting device - Google Patents

Abstract

The utility model relates to the technical field of circuit breakers, in particular to a cutting device, which comprises: the device comprises a shell, a moving contact and at least one limiting piece. Wherein, the shell is provided with a abdication hole; the movable contact is rotatably arranged in the shell; the limiting piece is fixedly arranged on the movable contact, the limiting piece is connected in the abdication hole in a sliding mode, and the limiting piece protrudes out of the abdication hole. According to the cutting device with the structure, the moving contact can rotate along one side deviating from the fixed contact under the action of electric repulsive force so as to cut off a circuit; the moving contact can drive the locating part to rotate in the rotation process, and the locating part protrusion hole of stepping down is set up at the rotation in-process, can reduce the locating part and take place from stepping down the hole and drop to reduce the moving contact and follow the emergence that drops in the casing, improve cutting device's security.

Description

Cutting device

Technical Field

The utility model relates to the technical field of circuit breakers, in particular to a cutting device.

Background

A circuit breaker refers to a switching device capable of closing, carrying and opening a current under normal circuit conditions and closing, carrying and opening a current under abnormal circuit conditions within a prescribed time. The circuit breaker is composed of a contact system, an arc extinguishing system, an operating mechanism, a release, a shell and the like.

The contact system comprises a moving contact and a fixed contact, wherein the moving contact is arranged in a rotary shell, and the fixed contact is arranged in the shell. When the circuit normally operates, the moving contact is contacted with the fixed contact; when a short circuit occurs in the circuit, the moving contact and the fixed contact are separated from the fixed contact by repulsive force generated when short circuit current passes through the moving contact and the fixed contact, so that the moving contact is repelled in advance before the operation of the operating mechanism; thereby realizing the function of cutting off fault current.

A linkage shaft is arranged on the traditional rotary shell, a groove is arranged on the moving contact in a matching way, the moving contact is connected with one end of the spring, and the rotary shell is connected with the other end of the spring; under the action of electric repulsive force, after the boss part on the movable contact pushes up the coupling shaft, the groove is embedded into the coupler, and in the process, the spring is in a stretching state; when the boss part pushes up the linkage shaft, the force value required by the spring is larger, and the reliability of the spring is insufficient at the moment; resulting in an insufficient safety problem for the contact system.

Disclosure of Invention

Therefore, the technical problem to be solved by the utility model is to overcome the defect that the contact system in the prior art has insufficient safety under the action of electric repulsion force, so as to provide a cutting device.

In order to solve the above-described problems, the present utility model provides a cutting device including:

the shell is provided with a yielding hole;

the movable contact is rotatably arranged in the shell;

the limiting piece is fixedly arranged on the movable contact, the limiting piece is slidably connected in the yielding hole, and the limiting piece protrudes out of the yielding hole.

Optionally, the method further comprises:

the shell is provided with a first limiting part and a second limiting part;

the first limiting part is formed in the shell;

the second limiting part is formed in the shell, and the first limiting part and the second limiting part are oppositely arranged;

the movable contact is in a repulsive locking state which rotates along one side away from the fixed contact and abuts against the first limiting part under the action of electric repulsive force, and the movable contact and the second limiting part are arranged at intervals in the repulsive locking state; the movable contact is driven by first external force to rotate along one side away from the first limiting part and is in contact with the second limiting part; the movable contact is driven by second external force to drive the movable contact to abut against the fixed contact in a closing state, and the movable contact is not contacted with the first limiting part and the second limiting part in the closing state; the movable contact is switched among the repulsion locking state, the free state and the closing state.

Optionally, the relief hole is disposed through inward along a surface of the housing.

Optionally, the method further comprises:

the torsion spring piece is suitable for limiting the movement of the limiting piece; the torsion spring member includes:

the first connecting part is connected with the limiting piece, the second connecting part is connected and arranged on the shell, the sleeving part is sleeved on the mounting part of the shell,

when the movable contact is in the unlocking state, the first connecting part applies a first elastic force to the limiting piece, wherein the first elastic force moves towards one side close to the second limiting part; when the movable contact is in the free state, the first connecting part applies a second elastic force to the limiting piece, wherein the second elastic force moves towards one side close to the first limiting part; when the moving contact is in a closing state, the first connecting part applies a third elastic force to the limiting part, wherein the third elastic force moves towards one side close to the first limiting part.

Optionally, the first connection part is provided with a first bearing surface and a second bearing surface, and the first bearing surface is connected with the second bearing surface;

in the unlocking state, the limiting piece is abutted against the first bearing surface; in the free state, the limiting piece abuts against the second bearing surface; and in the closing state, the limiting piece is abutted against the second bearing surface.

Optionally, an included angle between the first bearing surface and the second bearing surface is greater than 90 degrees and less than 180 degrees.

Optionally, the method further comprises:

the placing cavity is formed in the shell, and the second connecting part is connected to the placing cavity;

the support piece is formed on the placing cavity and is arranged along the surface of the placing cavity in an outward protruding mode;

the support piece is suitable for sleeving the sleeving part.

Optionally, the method further comprises:

the displacement compensation component is arranged between the shell and the moving contact and is suitable for compensating the deflection direction of the silver point part on the moving contact.

Optionally, the displacement compensation assembly includes:

the connecting rod is fixedly connected to the shell;

the sliding hole Kong Kaishe is formed in the movable contact and penetrates through the surface of the movable contact inwards; the arrangement direction of the sliding holes is parallel to the height direction of the silver point parts;

the connecting rod is connected with the sliding hole in a sliding way;

and in the closing state, the connecting rod is suitable for moving along the opening direction of the sliding hole under the drive of the third elastic force.

Optionally, the housing includes: the first shell and the second shell are matched in a fit mode, and an installation cavity suitable for placing the moving contact is formed by enclosing the first shell and the second shell;

the first limiting part is formed on the inner wall of one side of the mounting cavity;

the second limiting part is formed on the inner wall of the other side of the mounting cavity; the first limiting part and the second limiting part are oppositely arranged.

The utility model has the following advantages:

1. the present utility model provides a cutting device, comprising: the device comprises a shell, a moving contact and at least one limiting piece. Wherein, the shell is provided with a abdication hole; the movable contact is rotatably arranged in the shell; the limiting piece is fixedly arranged on the movable contact, the limiting piece is connected in the abdication hole in a sliding mode, and the limiting piece protrudes out of the abdication hole.

According to the cutting device with the structure, the moving contact can rotate along one side deviating from the fixed contact under the action of electric repulsive force so as to cut off a circuit; the moving contact can drive the locating part to rotate in the rotation process, and the locating part protrusion hole of stepping down is set up at the rotation in-process, can reduce the locating part and take place from stepping down the hole and drop to reduce the moving contact and follow the emergence that drops in the casing, improve cutting device's security.

2. The utility model provides a cutting device, further comprising: the torsional spring spare, torsional spring spare is suitable for spacing the removal of locating part, and torsional spring spare includes: the first connecting part is connected with the limiting piece, the second connecting part is connected and arranged on the shell, the sleeving part is sleeved on the mounting part of the shell, and the first connecting part applies a first elastic force to the limiting piece, which moves towards one side close to the second limiting part, when the moving contact is in a repulsive locking state; when the movable contact is in a free state, the first connecting part applies a second elastic force to the limiting part, wherein the second elastic force moves towards one side close to the first limiting part; when the moving contact is in a closing state, the first connecting part applies a third elastic force to the limiting part, wherein the third elastic force moves towards one side close to the first limiting part.

According to the cutting device with the structure, the first elastic force is arranged to limit the movement of the limiting piece, so that the moving contact is kept in a state of unlocking, the locking contact is prevented from being meshed with the fixed contact due to self gravity, the disconnection of a circuit is ensured, and the safety protection function is achieved; setting a second elastic force to limit the movement of the limiting piece, and transmitting the second elastic force to the moving contact after passing through the limiting piece, so as to provide initial pressure when the moving contact is switched from a free state to a repulsive locking state or a switching-on state, thereby meeting the normal use of the moving contact; and setting a third elastic force to limit the movement of the limiting piece so that the moving contact and the fixed contact are connected.

3. The utility model provides a cutting device, further comprising: the displacement compensation component is arranged between the shell and the movable contact and is suitable for compensating the deflection direction of the silver point part on the movable contact.

According to the cutting device with the structure, when the cutting device cuts off a circuit, a large current in the circuit generates heat to melt the silver point parts during circuit breaking, and because the melting conditions of the silver point parts at the two ends of the moving contact are different, in order to ensure the connection between the moving contact and the fixed contact in a closing state, a displacement compensation assembly is arranged to compensate the deflection direction of the silver point parts.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic main structure of a cutting device according to an embodiment of the present utility model;

fig. 2 is an exploded view of a main body structure of a cutting device according to an embodiment of the present utility model;

FIG. 3 is a side view of the main structure of a cutting device according to an embodiment of the present utility model;

FIG. 4 is a cross-sectional view of section A-A of FIG. 3 in accordance with the present utility model;

reference numerals illustrate:

1-a housing; 11-abdicating holes;

2-a moving contact;

3-limiting parts;

4-torsion spring members;

5-placing the cavity; 41-a first connection; 42-a second connection;

6-a support;

7-a displacement compensation assembly; 71-connecting rods; 72-slide hole.

Detailed Description

The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In addition, the technical features of the different embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.

Examples

The present embodiment provides a cutting device, as shown in fig. 1 to 4, including: the movable contact comprises a shell 1, a movable contact 2 and at least one limiting piece 3. Wherein, the shell 1 is provided with a yielding hole 11; the movable contact 2 is rotatably arranged in the shell 1; the limiting piece 3 is fixedly arranged on the moving contact 2, the limiting piece 3 is connected in the yielding hole 11 in a sliding mode, and the limiting piece 3 protrudes out of the yielding hole 11.

According to the cutting device with the structure, the movable contact 2 rotates along one side deviating from the fixed contact under the action of electric repulsive force so as to cut off a circuit; the moving contact 2 can drive the locating part 3 to rotate in the rotation process, and the locating part 3 is in the rotation process, and the locating part 3 protrusion is given way the hole 11 setting and can reduce the locating part 3 and is given way the hole 11 and drop from the emergence of giving way to reduce the moving contact 2 and drop from the casing 1 in the emergence, thereby improve cutting device's security.

As shown in fig. 1, 2 and 4, in the present embodiment, four relief holes 11 are formed, wherein two relief holes 11 are formed in a group, and one group is formed on one side surface of the housing 1; the other group of abdication holes 11 are symmetrically arranged on the side surface of the other side of the shell 1; the two abdication holes 11 of the same group are arranged in a central symmetry way; the limiting pieces 3 are provided with two groups, the two groups of limiting pieces 3 are respectively and fixedly arranged on the moving contact 2, and the limiting pieces 3 are matched with the yielding holes 11 in an adaptive manner; in other embodiments, the relief holes 11 may be formed in two groups, the two relief holes 11 are formed on two side surfaces of the housing 1, and the two relief holes 11 are symmetrically arranged; the limiting pieces 3 are matched and provided with a group, the limiting pieces 3 are fixedly arranged on the movable contact 2, and the limiting pieces 3 are slidably arranged in the abdication holes 11; in addition, in another embodiment, one hole 11 is provided, the hole 11 is provided on the side wall of the housing 1, the limiting member 3 is provided with one, the limiting member 3 is fixedly provided on the moving contact 2, the moving contact 2 is slidably disposed in the hole 11, specifically, the number of the limiting member 3 and the hole 11 is not limited, only the sliding connection of the limiting member 3 in the hole 11 is ensured, and the limiting member 3 protrudes out of the hole 11.

As shown in fig. 1 to 4, in the present embodiment, the housing 1 has a first limit portion and a second limit portion; the first limiting part is formed in the shell 1; the second limiting part is formed in the shell 1, and the first limiting part and the second limiting part are oppositely arranged; the moving contact 2 has a repulsive locking state which rotates along one side away from the fixed contact and is abutted against the first limiting part under the action of electric repulsive force, and the moving contact 2 and the second limiting part are arranged at intervals in the repulsive locking state; and a free state of driving the movable contact 2 to rotate along one side away from the first limiting part and abutting against the second limiting part under the drive of the first external force; the movable contact 2 is driven by the second external force to abut against the fixed contact, and in the closing state, the movable contact 2 is not contacted with the first limiting part and the second limiting part; the movable contact 2 is switched between a release locking state, a free state and a closing state.

As shown in fig. 1, 2 and 4, in the present embodiment, the relief hole 11 is an arc hole, and the arc hole is disposed to penetrate inward along the surface of the housing 1; when the limiting piece 3 rotates along with the moving contact 2, the limiting piece 3 is in a circular motion state, and the arc-shaped hole is suitable for accommodating the limiting piece 3; in other embodiments, the relief hole 11 may be a square hole, which is disposed through the surface of the housing 1 inward; when the limiting piece 3 rotates along with the moving contact 2, the limiting piece 3 is in a circular motion state, and the square hole is suitable for accommodating the limiting piece 3; specifically, the shape of the relief hole 11 is not limited, and it is only necessary to ensure that the relief hole is provided so as to penetrate inward along the surface of the housing 1.

As shown in fig. 1, 2 and 4, the present embodiment further includes: the torsional spring piece 4, the torsional spring piece 4 is suitable for spacing the removal of locating part 3, and torsional spring piece 4 includes: the first connecting part 41 is connected with the limiting piece 3, the second connecting part 42 is connected and arranged on the shell 1, the sleeving part is sleeved on the mounting part of the shell 1, and the first connecting part 41 applies a first elastic force to the limiting piece 3, which moves towards one side close to the second limiting part, when the movable contact 2 is in a repulsive locking state; the first connecting part 41 applies a second elastic force to the limiting piece 3, which moves towards the side close to the first limiting part, when the moving contact 2 is in a free state; when the movable contact 2 is in the closed state, the first connecting portion 41 applies a third elastic force to the stopper 3, which moves toward the side close to the first stopper. The first elastic force is suitable for limiting the movement of the limiting piece 3, so that the moving contact 2 is kept in a state of unlocking, the moving contact 2 is prevented from being meshed with the fixed contact due to self gravity, the disconnection of a circuit is ensured, and the safety protection function is realized; the second elastic force is suitable for limiting the movement of the limiting piece 3, and the second elastic force is transmitted to the moving contact 2 after passing through the limiting piece 3, so that the initial pressure is provided when the moving contact 2 is switched from a free state to a repulsive locking state or a switching-on state, and the normal use of the moving contact 2 is met; the third elastic force is suitable for limiting the movement of the limiting piece 3 so as to connect the moving contact 2 with the fixed contact; wherein, the torsion spring elements 4 are provided with four groups, two groups of torsion spring elements 4 are one group, one group of torsion spring elements 4 are symmetrically arranged on one side surface of the shell 1, and the other group of torsion spring elements 4 are symmetrically arranged on the other side surface of the shell 1; in other embodiments, the torsion spring members 4 are provided with two groups, the two groups of torsion spring members 4 are respectively arranged on two side surfaces of the shell 1, and the two groups of torsion spring members 4 are symmetrically arranged; in addition, in another embodiment, a group of torsion spring members 4 is provided, and a group of torsion spring members 4 is provided on the side wall of the housing 1; specifically, the number of the torsion spring members 4 is not limited, and only the first connecting portion 41 is required to be connected with the limiting member 3, the second connecting portion 42 is required to be connected with the housing 1, and the sleeved portion is required to be sleeved on the mounting portion of the housing 1.

As shown in fig. 1, 2 and 4, in the present embodiment, the first connection portion 41 has a first bearing surface and a second bearing surface, and the first bearing surface and the second bearing surface are connected; in the unlocking state, the limiting piece 3 is abutted against the first bearing surface; in a free state, the limiting piece 3 is abutted against the second bearing surface; in the closed state, the limiting piece 3 abuts against the second bearing surface.

As shown in fig. 1, 2 and 4, in the present embodiment, the included angle between the first bearing surface and the second bearing surface is greater than 90 degrees and less than 180 degrees.

As shown in fig. 1, 2 and 4, the present embodiment further includes: the device comprises a placing cavity 5 and a supporting piece 6, wherein the placing cavity 5 is arranged on a shell 1, and a second connecting part 42 is fixedly connected to the placing cavity 5; the supporting piece 6 is formed on the placing cavity 5, and the supporting piece 6 is arranged along the surface of the placing cavity 5 in an outward protruding way; the support 6 is adapted to engage the sleeve. The cutting device can be divided into different cavities by arranging the placing cavity 5, so that the particles burnt by the electric arc on the moving contact 2 are attached to the torsion spring 4 when the moving contact 2 and the fixed contact are disconnected, and the working performance of the torsion spring 4 is affected. The placing cavities 5 are suitable for accommodating the torsion spring members 4, four placing cavities 5 are arranged, two placing cavities 5 are in a group, one group of placing cavities 5 is arranged on one side wall of the shell 1, the other group of placing cavities 5 is arranged on the other side wall of the shell 1, and the placing cavities 5 arranged in the same group are arranged in a central symmetry manner; in other embodiments, two placement cavities 5 are provided, and the two placement cavities 5 are symmetrically arranged on the side walls of the two sides of the shell 1; in addition, in another embodiment, one placement cavity 5 is provided, and the placement cavity 5 is provided on the housing 1; specifically, the number of the placement cavities 5 is not limited, and only the number of the torsion spring members 4 is required to be matched, and the number of the support members 6 is matched with the number of the placement cavities 5.

As shown in fig. 1 to 4, in the present embodiment, the present embodiment further includes: the displacement compensation component 7, the displacement compensation component 7 is set up between body 1 and moving contact 2, the displacement compensation component 7 is suitable for compensating the deflection direction of the silver point portion on the moving contact 2. When the circuit is cut off by the cutting device, the silver point part is melted due to the fact that the large current in the circuit generates heat during circuit breaking, and the silver point parts at the two ends of the moving contact 2 are different in melting condition, so that in order to ensure connection between the moving contact 2 and the fixed contact in a closing state, the displacement compensation assembly 7 is arranged to compensate the deflection direction of the silver point parts.

As shown in fig. 1 to 4, in the present embodiment, the displacement compensation assembly 7 includes: a connecting rod 71 and a slide hole 72; the connecting rod 71 is fixedly connected to the housing 1; the sliding hole 72 is formed in the moving contact 2, and the sliding hole 72 is penetrated inwards along the surface of the moving contact 2; the arrangement direction of the slide holes 72 is parallel to the height direction of the silver dot portions; the connecting rod 71 is slidably connected with the slide hole 72; in the closed state, the connecting rod 71 is adapted to move in the opening direction of the slide hole 72 under the drive of the third elastic force. The sliding hole 72 is a kidney-shaped hole, and the length direction of the kidney-shaped hole is parallel to the height direction of the silver point part; the connecting rod 71 is slidably disposed in the kidney-shaped hole.

As shown in fig. 1 to 4, in the present embodiment, a housing 1 includes: the first shell 1 and the second shell 1 are matched in a fit mode, and the first shell 1 and the second shell 1 enclose a mounting cavity suitable for placing the moving contact 2; the first limiting part is formed on the inner wall of one side of the mounting cavity; the second limiting part is formed on the inner wall of the other side of the mounting cavity; the first limiting part and the second limiting part are oppositely arranged. The movable contact 2 can be conveniently installed by arranging the first shell 1 and the second shell 1, and the first shell 1 and the second shell 1 can be selectively disassembled in the subsequent maintenance and replacement process to replace damaged parts, so that the maintenance cost is reduced.

It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the utility model.

Claims (10)

1. A cutting device, comprising:

the device comprises a shell (1), wherein a yielding hole (11) is formed in the shell (1);

a moving contact (2) rotatably arranged in the housing (1);

at least one locating part (3), locating part (3) is fixed to be set up on moving contact (2), locating part (3) sliding connection is in hole (11) of stepping down, just locating part (3) protrusion hole (11) of stepping down sets up.

2. The cutoff device according to claim 1, further comprising:

the shell (1) is provided with a first limit part and a second limit part;

the first limiting part is formed in the shell (1);

the second limiting part is formed in the shell (1), and the first limiting part and the second limiting part are oppositely arranged;

the movable contact (2) is in a repulsive locking state which rotates along one side away from the fixed contact and abuts against the first limiting part under the action of electric repulsive force, and the movable contact (2) and the second limiting part are arranged at intervals in the repulsive locking state; the movable contact (2) is driven by first external force to rotate along one side away from the first limiting part and is in contact with the second limiting part in a free state; and under the drive of second external force, the moving contact (2) is driven to abut against the closing state of the fixed contact, and in the closing state, the moving contact (2) is not contacted with the first limiting part and the second limiting part; the movable contact (2) is switched among the unlocking state, the free state and the closing state.

3. A cutting device according to claim 2, characterized in that the relief hole (11) is provided through the surface of the housing (1) inwards.

4. The cutoff device according to claim 2, further comprising:

a torsion spring member (4), the torsion spring member (4) being adapted to limit the movement of the limiting member (3); the torsion spring member (4) includes:

the first connecting part (41), the second connecting part (42) and the sleeving part, wherein the first connecting part (41) is connected with the limiting piece (3), the second connecting part (42) is connected and arranged on the shell (1), the sleeving part is sleeved on the mounting part of the shell (1),

when the movable contact (2) is in the unlocking state, the first connecting part (41) applies a first elastic force to the limiting piece (3) and moves towards the side close to the second limiting part; when the movable contact (2) is in the free state, the first connecting part (41) applies a second elastic force to the limiting piece (3) and moves towards the side close to the first limiting part; when the moving contact (2) is in a closing state, the first connecting part (41) applies a third elastic force to the limiting piece (3) and moves towards the side close to the first limiting part.

5. The cutoff device according to claim 4, wherein the first connection portion (41) has a first bearing surface and a second bearing surface, the first bearing surface and the second bearing surface being connected;

in the unlocking state, the limiting piece (3) is abutted against the first bearing surface; in the free state, the limiting piece (3) is abutted against the second bearing surface; in the closing state, the limiting piece (3) abuts against the second bearing surface.

6. The cutoff device according to claim 5, wherein an included angle between the first bearing surface and the second bearing surface is greater than 90 degrees and less than 180 degrees.

7. The cutoff device according to claim 5, further comprising:

the placing cavity (5) is formed in the shell (1), and the second connecting part (42) is connected to the placing cavity (5);

the support piece (6) is formed on the placing cavity (5), and the support piece (6) is arranged along the surface of the placing cavity (5) in an outward protruding mode;

the support (6) is adapted to socket the socket.

8. The cutoff device of claim 4 further comprising:

the displacement compensation assembly (7), the displacement compensation assembly (7) is arranged between the shell (1) and the moving contact (2), and the displacement compensation assembly (7) is suitable for compensating the deflection direction of the silver point part on the moving contact (2).

9. A shut-off device according to claim 8, wherein the displacement compensation assembly (7) comprises:

the connecting rod (71), the said connecting rod (71) is fixedly connected to said body (1);

the sliding hole (72) is formed in the moving contact (2), and the sliding hole (72) is penetrated inwards along the surface of the moving contact (2); and the arrangement direction of the sliding holes (72) is parallel to the height direction of the silver point parts;

the connecting rod (71) is in sliding connection with the sliding hole (72);

in the closing state, the connecting rod (71) is suitable for being driven by the third elastic force to move along the opening direction of the sliding hole (72).

10. The shut-off device according to claim 2, wherein the housing (1) comprises: the movable contact comprises a first shell (1) and a second shell (1), wherein the first shell (1) and the second shell (1) are in fit, and a mounting cavity suitable for placing the movable contact (2) is formed by enclosing the first shell (1) and the second shell (1);

the first limiting part is formed on the inner wall of one side of the mounting cavity;

the second limiting part is formed on the inner wall of the other side of the mounting cavity; the first limiting part and the second limiting part are oppositely arranged.