A closing and opening mechanism

Abstract

The present invention provides a switch-on / off mechanism, which is arranged inside the housing of a switch-on / off circuit breaker, and includes a push assembly, a connecting rod assembly, a return assembly, and a switch assembly. The push assembly includes a push rod with a retractable end, and the connecting rod assembly includes a plurality of connecting rods that are rotatably connected end to end in sequence. One end of the connecting rod assembly is rotatably connected to the housing, and the other end is movably arranged, thereby forming an extended state and a folded state respectively; the push rod is arranged corresponding to the connection point of two of the connecting rods, so that when the push rod is extended, the connecting rod assembly in the folded state is extended as a whole; the return assembly is arranged in cooperation with the push assembly and the connecting rod assembly, so that when the push rod is extended, the connecting rod assembly in the extended state is controlled to return to the folded state through the return assembly; the connecting rod assembly adjusts the connection or disconnection of the switch assembly by extension or folding. The present invention solves the problem that the integrated switch-on / off mechanism occupies a large space, and makes the structure compact.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit breakers, and in particular to an opening and closing mechanism. Background Art

[0002] Circuit breakers are common circuit protection devices. Generally speaking, circuit breakers have two states: open and closed. The open and close mechanism is the core component that realizes the functions inside the circuit breaker. The traditional circuit breakers currently used cannot be remotely controlled and can only be operated locally. The open and close states are manually completed through the handle set on the circuit breaker. This reduces the efficiency of circuit control, and increases the chance of contact between operators and electrical components, increasing the risk of electric shock.

[0003] In order to realize the automation of power supply guarantee, the prior art has developed a device that can remotely control the opening and closing mechanism, and use a motor or an electromagnet to control the mechanism. However, when the motor or the electromagnet is used as a driving component, a large space requirement is imposed, and when a motor is used, an additional level of space (18 mm) is required; the closing and opening parts are relatively divided into two parts, the structure is not compact enough, and the size is large; because there are requirements on the power of the motor to avoid driving the stationary closing mechanism, the external dimensions of the motor and the electromagnet are relatively increased, thereby increasing the space occupied by the entire mechanism, resulting in a slow closing speed and low reliability. Summary of the invention

[0004] In view of the deficiencies existing in the prior art, the present invention provides an opening and closing circuit breaker, which solves the problems in the prior art that the opening and closing structure occupies a large space, has a slow closing speed and low reliability.

[0005] According to an embodiment of the present invention, a switching mechanism is provided, which is arranged inside the shell of a switching circuit breaker, and includes a pushing assembly, a connecting rod assembly, a return assembly, and a switch assembly. The pushing assembly includes a push rod that is retractable at one end, and the connecting rod assembly includes a plurality of connecting rods that are rotatably connected end to end in sequence. One end of the connecting rod assembly is rotatably connected to the shell, and the other end is movably arranged to form an extended state and a folded state, respectively; the push rod is arranged corresponding to the connection point of two of the connecting rods, so that when the push rod is extended, the connecting rod assembly in the folded state is extended as a whole; the return assembly is arranged in cooperation with the pushing assembly and the connecting rod assembly, so that when the push rod is extended, the connecting rod assembly in the extended state is controlled to return to the folded state through the return assembly; the connecting rod assembly adjusts the connection or disconnection of the switch assembly by extension or folding.

[0006] The unique technical principle of the present invention is: when the pushing assembly is started, the push rod is pushed toward the connection position of the two adjacent connecting rods in the connecting rod assembly. Because one end of the connecting rod assembly is rotatably connected to the shell, and the other end is movably arranged, and the connecting rod assembly adjusts the connection or disconnection of the switch assembly by extending or folding, the connecting rod assembly is extended as a whole when the push rod is extended, thereby connecting the circuit, and the return assembly allows the extended connecting rod assembly to be folded back to its original state, thereby disconnecting the circuit, and finally realizing the function of remote control closing and opening.

[0007] Preferably, the connecting rod assembly includes a first connecting rod and a secondary connecting rod device, the secondary connecting rod device is composed of multiple connecting rods, one end of the first connecting rod is rotatably connected to the shell, and the other end is rotatably connected to the secondary connecting rod device, the end of the secondary connecting rod device away from the first connecting rod is a sliding end, and the sliding end is movably connected to the switch assembly.

[0008] Preferably, the switch assembly includes a moving contact, a stationary contact and a second torsion spring, the moving contact and the stationary contact are made of conductive materials, the moving contact is a strip structure, one end of the moving contact is rotatably connected to the shell, the middle part of the moving contact is connected to the connecting rod assembly, and the second torsion spring is installed at the connection position between the moving contact and the shell, one end of the second torsion spring is connected to the shell, and the other end is connected to the moving contact, and applies a force toward the connecting rod assembly to the moving contact; the stationary contact is fixedly arranged on the shell and is located on the moving trajectory of the moving contact; the moving contact and the stationary contact are respectively connected to the circuit.

[0009] Preferably, the secondary connecting rod device includes a second connecting rod, a third connecting rod, a lock and a first torsion spring; the second connecting rod and the third connecting rod are rotationally connected, and the free ends of the second connecting rod and the third connecting rod are rotationally connected to the first connecting rod and the switch assembly respectively; the lock is rotationally connected to the side of the third connecting rod away from the push rod, and the lock allows the second connecting rod to rotate in the same direction as the lock only when the lock rotates away from the push rod; a first torsion spring is provided at the position where the second connecting rod and the third connecting rod are rotationally connected, one end of the first torsion spring is connected to the rotating shaft between the second connecting rod and the first connecting rod, and the other end is connected to the lock, and the first torsion spring applies force in opposite directions to the second connecting rod and the lock; a first limit block is provided on the third connecting rod, and the first limit block limits the second connecting rod from rotating toward the push rod.

[0010] Preferably, the pin shaft for rotationally connecting the lock and the third connecting rod is a semicircular rotating shaft, the plane of the pin shaft contacts the side surface of the second connecting rod, and a bayonet is provided on the side surface of the second connecting rod. The sharp end of the semicircular rotating shaft cooperates with the bayonet to prevent the second connecting rod from rotating around the third connecting rod in a direction away from the push rod.

[0011] Preferably, the return assembly includes a trigger key and a trip rod, the trigger key is coaxially connected to the shell with the first connecting rod, the trigger key includes a touch section and an adjustment section extending respectively, the touch section and the adjustment section are arranged corresponding to the push rod and the trip rod respectively, wherein the push rod drives the trigger key to rotate through the touch section, and the adjustment section contacts the trip rod to drive the trip rod to rotate; the movable end of the trip rod corresponds to the lock position and drives the lock to rotate when rotating; a third torsion spring is arranged at the rotation connection position between the first connecting rod and the shell, one end of the third torsion spring is in contact with the shell, and the other end is connected to the first connecting rod, the end of the third torsion spring connected to the first connecting rod is also in contact with the trigger key, and limits the trigger key, the third torsion spring applies a force to the trip rod away from the push rod, and applies a force to the first connecting rod close to the push rod.

[0012] Preferably, the torque of the second torsion spring is greater than the sum of the torques of the first torsion spring and the third torsion spring.

[0013] Preferably, the third connecting rod is movably connected to the moving contact, and one end of the third torsion spring is in contact with a side of the third connecting rod away from the push rod, and applies a force to the third connecting rod in a direction toward the push rod.

[0014] Preferably, a movable block is further provided on the connecting shaft between the third connecting rod and the moving contact, a strip groove perpendicular to the push rod is provided on the housing, and the movable block is cooperatively arranged in the strip groove and moves along the strip groove.

[0015] The present invention has the following beneficial effects:

[0016] 1. Closing and opening are completed by the same connecting rod assembly, so that the structure of the present invention is compact and occupies little space; a pushing assembly is used instead of a motor drive, because the space occupied by the motor is larger than that of the pushing assembly, thus further reducing the space occupied; and the same pushing assembly can control both opening and closing, thus reducing the space occupied by the opening and closing structure; the push rod stroke required for switching closing and opening of the mechanism is shorter, making the internal structure of the present invention more compact, and in addition, the push rod only needs to perform telescopic movement during operation, and does not need to bear greater pressure, and is not easy to bend or break, thereby increasing the stability of the mechanism during use.

[0017] 2. When the lock is triggered, the closing speed of the opening and closing mechanism is accelerated under the action of the torsion spring; the pushing component only needs to push the trip rod to control the rotation of the lock hole to complete the opening of the switch. The rotation of the lock does not require excessive torque, and the load on the pushing component is small, which extends the service life of the pushing component. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the switch-off structure according to an embodiment of the present invention.

[0019] Figure 2 Schematic diagram of the closing structure of an embodiment of the present invention.

[0020] Figure 3 Schematic diagram of the structure of the secondary connecting rod device according to an embodiment of the present invention.

[0021] In the above drawings: 1. first connecting rod; 2. second connecting rod; 3. third connecting rod; 4. lock; 5. moving contact; 6. static contact; 8. push rod; 9. handle; 10. first torsion spring; 11. third torsion spring; 12. second torsion spring; 13. push-pull electromagnet; 14. first limit block; 15. housing part; 16. trigger key; 17. trip rod; 18. second limit column; 19. fourth limit column; 20. third limit block; 21. lever; 22. movable block. DETAILED DESCRIPTION

[0022] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0023] A switch-on / off mechanism, which is arranged inside the housing of a switch-on / off circuit breaker, includes a push assembly, a connecting rod assembly, a return assembly, and a switch assembly. The push assembly includes a push rod 8 with a retractable end, and the connecting rod assembly includes a plurality of connecting rods connected in turn end to end. One end of the connecting rod assembly is rotatably arranged, and the other end is movable, so as to form an extended state and a folded state respectively; the push rod 8 is arranged corresponding to the connection point of two connecting rods, so that when the push rod 8 is extended, the connecting rod assembly in the folded state is extended as a whole; the return assembly is arranged in cooperation with the push assembly and the connecting rod assembly, so that when the push rod 8 is extended, the connecting rod assembly in the extended state is controlled to return to the folded state through the return assembly; the connecting rod assembly adjusts the connection or disconnection of the switch assembly by extension or folding. The material of the connecting rod assembly is plastic, so as to avoid short circuit, and also has the advantages of reducing weight and saving cost. In this example, the push assembly includes a push-pull electromagnet 13, and the movable section of the push-pull electromagnet 13 is fixedly connected to the push rod 8, and the moving direction of the push rod 8 is parallel to the rotating surface of the connecting rod assembly. For ease of explanation, in this embodiment, the pushing assembly is arranged on the left side of the shell, the connecting rod assembly is arranged on the right side of the pushing assembly, and the switch assembly is arranged on the lower side of the connecting rod assembly.

[0024] Preferably, the connecting rod assembly includes a first connecting rod 1 and a secondary connecting rod device, wherein the secondary connecting rod device is composed of a plurality of connecting rods, wherein one end of the first connecting rod 1 is rotatably connected to the housing, and the other end is rotatably connected to the secondary connecting rod device, and the end of the secondary connecting rod device away from the first connecting rod 1 is a sliding end, and the sliding end is movably connected to the switch assembly. The motion trajectory of the push rod 8 corresponds to the rotational connection area between the first connecting rod 1 and the secondary connecting rod device. In this embodiment, for the sake of convenience of explanation, the rotational connection point between the first connecting rod 1 and the secondary connecting rod is called the first rotation point.

[0025] Preferably, the secondary link device includes a second link 2, a third link 3, a lock 4 and a first torsion spring 10; the second link 2 and the third link 3 are rotationally connected, and the free ends of the second link 2 and the third link 3 are rotationally connected to the first link 1 and the switch assembly respectively; the lock 4 is rotationally connected to the side of the third link 3 away from the push rod 8, and the lock 4 makes the second link 2 rotate in the same direction with the lock 4 only when the lock 4 rotates clockwise; a first torsion spring 10 is arranged at the position where the second link 2 and the third link 3 are rotationally connected, one end of the first torsion spring 10 is connected to the rotating shaft between the second link 2 and the first link 1, and the other end is connected to the lock 4, and the first torsion spring 10 exerts force in opposite directions on the second link 2 and the lock 4; the third link 3 is provided with a first limit block 14 in a position opposite to the lock 4, and the first limit block 14 limits the second link 2 from rotating toward the push rod 8. In this example, the third connecting rod 3 is configured as a hollow slot structure, with the top and right side open and the left side closed. The rotation connection position of the second connecting rod 2 and the third connecting rod 3 is set in the U-shaped slot, and the lock buckle 4 is set on the right side of the slot. Since the left side of the slot is closed and the lock buckle 4 is set on the right side, the clockwise and counterclockwise rotation of the second connecting rod 2 relative to the third connecting rod 3 is restricted. The lock buckle 4 is provided with a fourth limiting column 19, and one end of the first torsion spring 10 contacts the fourth limiting column 19 and drives the lock buckle 4 to rotate counterclockwise. Since the lock buckle 4 is in close contact with the second connecting rod 2, although it is subjected to the counterclockwise rotation force applied by the first torsion spring 10, it is blocked by the second connecting rod 2 and cannot rotate, and maintains the locked state with the second connecting rod 2.

[0026] Preferably, the pin shaft for rotationally connecting the lock catch 4 and the third connecting rod 3 is a structure with a semicircular cross section, the plane of the pin shaft relative to the arc surface contacts the side surface of the second connecting rod 2, and a bayonet is provided on the side surface of the second connecting rod 2. The sharp end of the pin shaft formed by the semicircular structure cooperates with the bayonet to prevent the second connecting rod 2 from rotating around the third connecting rod 3 in a direction away from the push rod 8. In this example, the outer surface of the second connecting rod 2 near the lock catch 4 is composed of two arc surfaces with different diameters, and the connection position of the two arc surfaces forms a stepped bayonet. When the lock catch 4 rotates clockwise, the plane on the rotating shaft rotates, so that the sharp end does not contact the bayonet but the plane contacts the outer surface of the second connecting rod 2, and the rotation of the second connecting rod 2 is not blocked. When the second connecting rod 2 rotates away from the push rod 8 relative to the third connecting rod 3, one end of the first torsion spring 10 maintains stable contact with the lock catch 4.

[0027] Preferably, the switch assembly includes a moving contact 5, a stationary contact 6 and a second torsion spring 12, the moving contact 5 and the stationary contact 6 are made of conductive materials, the moving contact 5 is a strip structure, and in this example, the moving contact 5 is made of metal. One end of the moving contact 5 is rotatably connected to the shell, and the middle part of the moving contact 5 is connected to the connecting rod assembly; a gap is provided in the horizontal direction at the position where the moving contact 5 is rotatably connected to the shell, because the force application point of the connecting rod assembly on the moving contact 5 is in the vertical direction rather than along the rotation direction of the moving contact 5, the position of the moving contact 5 is adjusted by the gap to prevent the moving contact 5 from being deformed or stuck. A second torsion spring 12 is installed at the connection position between the moving contact 5 and the shell. One end of the second torsion spring 12 is connected to the shell part 15, and the other end is connected to the moving contact 5, and applies a force toward the connecting rod assembly to the moving contact 5; the static contact 6 is fixedly arranged on the shell and is located on the moving trajectory of the moving contact 5, and is always below the moving contact 5; the moving contact 5 and the static contact 6 are respectively connected to the circuit.

[0028] Preferably, the third connecting rod 3 and the moving contact 5 are movably connected, and one end of the third torsion spring 11 contacts the side of the third connecting rod 3 away from the push rod 8, and applies a force to the third connecting rod 3 in the direction of the push rod 8. The rotation connection position of the moving contact 5 and the third connecting rod 3 is provided with a certain gap in the vertical direction, so that the connection point can move in the vertical direction. When the first connecting rod 1 is just rotated to the vertical state, the connection point between the third connecting rod 3 and the moving contact 5 is the farthest from the push rod 8. When the locked state is maintained, the first connecting rod 1 is in an inclined state just after the vertical state, and the moving contact 5 will move upward for a short distance to ensure the contact between the moving contact 5 and the static contact 6. The gap here is actually because when the first connecting rod 1 passes through the vertical state, the lowest end of the third connecting rod 3 will first reach the lowest point and then move upward a little. In order to ensure that it can still contact with the static contact 6 after moving up a little, a buffer section is required on the moving contact 5.

[0029] Preferably, the return assembly includes a trigger key 16 and a trip rod 17, the trigger key 16 is coaxially connected to the housing with the first connecting rod 1, the trigger key 16 includes a touch section and an adjustment section that extend respectively, the touch section and the adjustment section are respectively arranged corresponding to the push rod 8 and the trip rod 17, wherein the push rod 8 drives the trigger key 16 to rotate through the touch section, and the adjustment section contacts the trip rod 17 to drive the trip rod 17 to rotate; the movable end of the trip rod 17 corresponds to the position of the lock buckle 4, and drives the lock buckle 4 to rotate when rotating, and one end of the trip rod 17 The first connecting rod 1 and the housing are rotatably connected at the end; a third torsion spring 11 is provided at the rotatably connected position of the first connecting rod 1 and the housing, one end of the third torsion spring 11 is connected and in contact with the housing portion 15, and the housing limits the rotation of the third torsion spring 11, and the other end is connected to the first connecting rod 1. The third torsion spring 11 is connected to the first connecting rod 1 at one end, which is bent and in contact with the trigger key 16, and limits the trigger key 16. The third torsion spring 11 applies a force to the tripping rod 17 away from the push rod 8, and applies a force to the first connecting rod 1 close to the push rod 8. In this example, a third limit block 20 is provided in the housing, and when the first connecting rod 1 just rotates through the vertical state and is on the side away from the push rod 8, the third limit block 20 limits the rotation of the first connecting rod 1, so that the first connecting rod 1 is stationary in the state just after the vertical state. In this example, a second limiting column 18 is provided on the lock buckle 4. The second limiting column 18 protrudes from the surface of the lock buckle 4 and is close to the release rod 17. Its position is on the movement trajectory of the release rod 17. When the release rod 17 is rotated under force, it contacts the second limiting column 18 and drives the lock buckle 4 to rotate clockwise.

[0030] In this embodiment, the trigger key 16 is a T-shaped structure composed of a connecting section and a rotating section, one end of the connecting section is fixedly connected to the middle position of the rotating section, and the other end is coaxially connected to the housing with the upper connecting rod, and the two ends of the rotating section are respectively arranged corresponding to the push rod 8 and the tripping rod 17. The first connecting rod 1 and the trigger key 16 are both provided with a bracket 21 perpendicular to the rotating surface for fixing the third torsion spring 11. This structure is simple, low in manufacturing cost, and can effectively complete the transmission task.

[0031] Preferably, the torque of the second torsion spring 12 is greater than the sum of the torques of the first torsion spring 10 and the third torsion spring 11. When the first connecting rod 1 just rotates through the vertical state and is in a state slightly tilted to the right, the locked state can be maintained as long as the torque of the third torsion spring 11 is sufficient. Otherwise, the sum of the torsion of the third torsion spring 11 and the first torsion spring 10 will push the connection point of the first connecting rod 1 and the secondary connecting rod device to move to the initial position.

[0032] Preferably, a movable block 22 is further provided on the connecting shaft of the third connecting rod 3 and the moving contact 5, and a strip groove perpendicular to the push rod 8 is provided on the housing, and the movable block 22 is matched and arranged in the strip groove and moves along the strip groove. In this example, the movable block 22 is coaxially connected to the third connecting rod 3 and the moving contact 5. Its purpose is to limit the moving direction of the bottom end of the third connecting rod 3 so that it can only move in the vertical direction.

[0033] In this example, it also includes a handle 9, which is rotatably connected to the top of the shell, and its rotating surface is parallel to the first connecting rod 1. One end of the handle 9 is located outside the shell, and the other end is located inside the shell and is provided with a gear. The first connecting rod 1 is provided with a first extension portion, and the first extension portion and the rotating shaft are both provided with mutually meshing teeth; when emergency operation is required, the handle 9 can be pushed to rotate to drive the first connecting rod 1 to rotate, thereby driving the entire mechanism to open or close the switch.

[0034] Closing working steps: When the push-pull electromagnet 13 receives an electrical signal, it pushes the push rod 8 to move toward the rotation connection position of the first connecting rod 1 and the second connecting rod 2 (the second connecting rod 2 and the third connecting rod 3 are prevented from rotating relative to each other by the lock 4 and the first limit block 14, so they are regarded as a whole). When the end face of the push rod 8 and the connecting rod assembly begin to contact, the first rotation point is pushed away from the push rod 8. When the first rotation point passes the vertical line from the first connecting rod 1 and the rotation connection point of the housing to the push rod 8 and is on the side away from the push rod 8, when it wants to continue to rotate, the third limit block 20 blocks the rotation movement of the first connecting rod 1. The second torsion spring 12 always drives the secondary connecting rod device to move upward, thereby pushing the first connecting rod 1 that has passed the balance point to the right. Because the torsion of the first torsion spring 10 and the third torsion spring 11 cannot overcome the second torsion spring 12, the mechanism always remains locked. Then the third connecting rod 3 is always in a position away from the push rod 8, pushing the moving contact 5 and the static contact 6 to contact each other.

[0035] The opening working steps: when the opening is required, the trigger key 16 has rotated with the first connecting rod 1 to the position where the push rod 8 can contact, the push rod 8 contacts the contact section of the trigger key 16, and drives the trigger key 16 to rotate. When the trigger key 16 rotates, its adjustment section contacts the tripping rod 17 and drives the tripping rod 17 to rotate clockwise at the same time. The tripping rod 17 contacts the second limit column 18 on the lock buckle 4 and drives the lock buckle 4 to rotate clockwise. The second torsion spring 12 always applies thrust to the connecting rod assembly. When the lock buckle 4 rotates a certain angle, the step position on the second connecting rod 2 is no longer stuck between the lock buckle 4, but can pass through the plane position on the rotating shaft of the lock buckle 4. At this time, the second connecting rod 2 can rotate around the third connecting rod 3 in the direction away from the push rod 8, and the second connecting rod 2 and the third connecting rod 3 are no longer a fixed integral mechanism. At this time, the second spring moves the connection position of the moving contact 5 and the third connecting rod 3 upward, and at the same time completes the separation of the moving contact 5 and the static contact 6; because the internal structure of the secondary connecting rod device is loose, the second spring cannot apply force to the first connecting rod 1, so the first torsion spring 10 and the third torsion spring 11 drive the first rotation point back to the initial position.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A switch-on / off mechanism, which is arranged inside the housing of a switch-on / off circuit breaker, characterized in that: It comprises a pushing assembly, a connecting rod assembly, a return assembly and a switch assembly, wherein the pushing assembly comprises a push rod with a retractable end, the connecting rod assembly comprises a plurality of connecting rods which are rotatably connected end to end in sequence, one end of the connecting rod assembly is rotatably connected to a housing, and the other end is movably arranged, thereby forming an extended state and a folded state respectively; the pushing rod is arranged corresponding to the connection point of two of the connecting rods, so that when the pushing rod is extended, the connecting rod assembly in the folded state is extended as a whole; the return assembly is arranged in cooperation with the pushing assembly and the connecting rod assembly, so that when the pushing rod is extended, the connecting rod assembly in the extended state is controlled to return to the folded state through the return assembly; the connecting rod assembly adjusts the connection or disconnection of the switch assembly by extension or folding; The connecting rod assembly comprises a first connecting rod and a secondary connecting rod device, wherein the secondary connecting rod device is composed of a plurality of connecting rods, wherein one end of the first connecting rod is rotatably connected to the housing, and the other end is rotatably connected to the secondary connecting rod device, and the end of the secondary connecting rod device away from the first connecting rod is a sliding end, and the sliding end is movably connected to the switch assembly; The switch assembly includes a moving contact, a stationary contact and a second torsion spring. The moving contact and the stationary contact are made of conductive materials. The moving contact is a strip-shaped structure. One end of the moving contact is rotatably connected to the housing. The middle of the moving contact is connected to the connecting rod assembly. The second torsion spring is installed at the connection position between the moving contact and the housing. One end of the second torsion spring is connected to the housing and the other end is connected to the moving contact, and applies a force toward the connecting rod assembly to the moving contact. The stationary contact is fixedly arranged on the housing and is located on the moving track of the moving contact. The moving contact and the stationary contact are respectively connected to the circuit. The secondary connecting rod device includes a second connecting rod, a third connecting rod, a lock buckle and a first torsion spring; the second connecting rod and the third connecting rod are rotatably connected, and the free ends of the second connecting rod and the third connecting rod are rotatably connected to the first connecting rod and the switch assembly respectively; the lock buckle is rotatably connected to the side of the third connecting rod away from the push rod, and the lock buckle enables the second connecting rod to rotate in the same direction as the lock buckle only when the lock buckle rotates away from the push rod; a first torsion spring is provided at the position where the second connecting rod and the third connecting rod are rotatably connected, one end of the first torsion spring is connected to the rotating shaft between the second connecting rod and the first connecting rod, and the other end is connected to the lock buckle, and the first torsion spring applies force in opposite directions to the second connecting rod and the lock buckle; a first limit block is provided on the third connecting rod, and the first limit block limits the second connecting rod from rotating toward the push rod; The pin shaft for rotationally connecting the lock buckle and the third connecting rod is a semicircular rotating shaft, the plane of the pin shaft contacts the side surface of the second connecting rod, a bayonet is provided on the side surface of the second connecting rod, and the sharp end of the semicircular rotating shaft cooperates with the bayonet to prevent the second connecting rod from rotating around the third connecting rod in a direction away from the push rod; The return assembly includes a trigger key and a trip rod, the trigger key is coaxially rotatably connected to the shell with the first connecting rod, the trigger key includes a touch section and an adjustment section that extend respectively, the touch section and the adjustment section are respectively arranged corresponding to the push rod and the trip rod, wherein the push rod drives the trigger key to rotate through the touch section, and the adjustment section contacts the trip rod to drive the trip rod to rotate; the movable end of the trip rod corresponds to the lock position, and drives the lock to rotate when rotating; a third torsion spring is arranged at the rotation connection position between the first connecting rod and the shell, one end of the third torsion spring contacts the shell, and the other end is connected to the first connecting rod, the end of the third torsion spring connected to the first connecting rod is also in contact with the trigger key, and limits the trigger key, the third torsion spring applies a force to the trip rod away from the push rod, and applies a force to the first connecting rod close to the push rod; The torque of the second torsion spring is greater than the sum of the torques of the first torsion spring and the third torsion spring.

2. A switch-on and switch-off mechanism according to claim 1, characterized in that: The third connecting rod is movably connected to the moving contact, and one end of the third torsion spring contacts a side of the third connecting rod away from the push rod, and applies a force toward the push rod to the third connecting rod.

3. A switch-on and switch-off mechanism according to claim 1, characterized in that: A movable block is also provided on the connecting shaft between the third connecting rod and the moving contact, a strip groove perpendicular to the push rod is provided on the housing, and the movable block is matched and arranged in the strip groove and moves along the strip groove.

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