A linkage device between a lock and a moving contact of a circuit breaker

Abstract

The present invention relates to a circuit breaker, in particular to a linkage device between a lock and a moving contact inside the circuit breaker. The present invention adopts the following technical scheme: a linkage device between a lock and a moving contact of a circuit breaker, characterized in that: a sliding groove for sliding the end of a connecting rod of the circuit breaker is provided at the upper end of the moving contact seat, the sliding groove includes a curved portion and a straight portion, a contact arm is provided at the upper end of the lock, and a contact surface is provided on the contact arm, after the circuit breaker is closed, the offline mechanism of the circuit breaker can act on the lock to rotate the lock, and the contact surface loses the lock on the second end of the connecting rod, at this time, the second end of the connecting rod slides into the straight portion of the sliding groove, and the rotation of the moving contact seat drives the moving contact to rotate to realize the disconnection of the circuit breaker. By adopting the above scheme, the present invention overcomes the problems existing in the prior art, and provides a novel linkage device between a lock and a moving contact of a circuit breaker, which can reduce tripping and reduce the product tripping force through mechanical principles and mechanics, and metal or plastic particles can fall into the corresponding groove or gap without affecting the action of the moving contact.

Description

Technical Field

[0001] The invention relates to a circuit breaker, in particular to a linkage device between a lock and a moving contact inside the circuit breaker. Background Art

[0002] The traditional circuit breaker product mechanism is generally equipped with levers, locks and trips. The structure is complex and the cost is high. The volume of the trip is not conducive to automated assembly. In addition, the product has many parts and the product has the risk of failure. Now, a circuit breaker that can reduce parts, remove the trip and reduce the trip force of the product through the principles of mechanics and mechanics is designed. The traditional circuit breaker product fixing mechanism uses a metal shaft. Because the metal shaft is conductive, there is a problem of too small electrical gap between the L pole and the N pole for products with contacts on both the 1P+N or L pole and N pole, or the L pole and N pole withstand voltage breakdown after the breaking test. Therefore, the metal shaft is not used to position the product. The lever and the shell are used to achieve positioning. During the mechanical movement between the lever and the moving contact of the traditional circuit breaker, friction produces plastic or metal particles that affect the movement of the contact. Therefore, a moving contact surface corresponding to the moving contact is set to make the moving contact conflict with the contact surface. The metal or plastic particles can fall into the corresponding groove so as not to affect the movement of the moving contact. The plastic particles generated by the friction during the movement of the traditional lock and lever can increase the trip force and affect the action characteristics of the product. Summary of the invention

[0003] The present invention overcomes the problems existing in the prior art and provides a novel linkage device between the lock and the moving contact of a circuit breaker which can reduce tripping and reduce the product tripping force through mechanical principles and mechanical principles, wherein metal or plastic particles can fall into corresponding grooves or gaps without affecting the movement of the moving contact.

[0004] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a linkage device between a lock and a moving contact of a circuit breaker, comprising a handle, a lock, a lock push rod mechanism, a moving contact seat and a moving contact, a connecting rod is arranged between the handle and the moving contact seat, a first end of the connecting rod is connected to the handle, and a second end of the connecting rod is connected to the moving contact seat, the lock and the moving contact are both arranged on the moving contact seat, and a linkage arrangement is realized between the moving contact and the moving contact seat through a torsion spring, characterized in that: a mounting column is integrally arranged on the moving contact seat, the lock and the moving contact are movably sleeved on the mounting column, a sliding groove is arranged on the upper end of the moving contact seat for the end of the circuit breaker connecting rod to slide, the sliding groove comprises a curved portion and a straight portion, a resisting arm is arranged on the upper end of the lock, a resisting surface is arranged on the resisting arm, and the lock push rod mechanism comprises a curved portion and a straight portion, a resisting arm is arranged on the upper end of the lock, a resisting surface is arranged on the resisting arm, and a resisting arm is arranged on the resisting arm. The rod mechanism includes a bracket, a spring and a push rod. The bracket is arranged on the side of the lock in the circuit breaker housing, and an accommodating cavity is arranged on the bracket. The spring and the push rod are arranged in the accommodating cavity. Under the action of the spring, the end of the push rod protrudes from the bracket accommodating cavity. After the circuit breaker is disconnected, the end of the push rod abuts against the side of the lock, so that the abutting surface of the lock abutting arm cooperates with the curved portion of the slide groove to lock the second end of the circuit breaker connecting rod. At this time, the handle can be pushed, and the handle drives the moving contact seat to rotate through the connecting rod, and the moving contact seat drives the moving contact to rotate to realize the circuit breaker closing; after the circuit breaker is closed, the offline mechanism of the circuit breaker can act on the lock to make the lock rotate, and the abutting surface loses the lock on the second end of the connecting rod. At this time, the second end of the connecting rod slides into the straight portion of the slide groove, and the moving contact seat rotates to drive the moving contact to rotate to realize the circuit breaker disconnection.

[0005] By adopting the above scheme, a new method is adopted to realize locking or unlocking the end of the circuit breaker connecting rod, which is simple, convenient and reliable in structure. In addition, through the cooperation between the contact surface of the lock buckle and the slide groove, it is only necessary to control the rotation of the lock buckle, which is very practical. In the above scheme, the thrust of the top rod on the lock buckle can also be reduced after the lock buckle rotates, so that the requirements for the releaser during tripping are greatly reduced.

[0006] A further configuration of the present invention is that: the curved portion of the slide groove is bent downward at one end close to the handle, and a limiting surface and a pressure surface are arranged on the lower side of the curved portion. The limiting surface is the lowest point position of the second end of the connecting rod in the curved portion of the slide groove after the circuit breaker is opened. After the circuit breaker is opened, the first end of the connecting rod connected to the handle is higher than the second end of the connecting rod in the curved portion of the slide groove. During and after the circuit breaker is closed, the second end of the connecting rod abuts against the pressure surface. At this time, the angle between the thrust direction generated by the handle on the second end of the connecting rod and the thrust direction generated by the pressure surface on the second end of the connecting rod is less than 180 degrees. After the circuit breaker is closed, the top rod end of the lock push rod mechanism is separated from the lock side.

[0007] By adopting the above scheme, the working stability of the circuit breaker can be well guaranteed, wherein the setting of the limit surface and the pressure surface ensures that the connecting rod can be controlled when the handle is operated, wherein the limit surface limits the position of the second end of the connecting rod. If its position is not guaranteed, it cannot be operated, and the pressure surface ensures that the thrust is generated on the second end of the connecting rod during and after the circuit breaker is closed, and the direction of the thrust must also be handled properly, so that the circuit breaker can be closed normally and the lock can be quickly released after closing. In this application document, the pressure surface can also be connected with the limit surface, and the setting of the above position also ensures that the circuit breaker can work normally.

[0008] A further configuration of the present invention is that an inclined surface is provided on the outside of the contact surface of the contact arm for allowing the second end of the connecting rod to slide into the curved portion of the slide groove, a lever arm is provided above the lock buckle and below the contact arm, the contact arm and the lever arm are forked to form a fork, the width of the fork is greater than the diameter of the second end of the connecting rod, and the upper side of the lever arm can push the second end of the connecting rod to cause the second end of the connecting rod to slide into the straight portion of the slide groove when the circuit breaker is opened.

[0009] By adopting the above scheme, the inclined surface is used to ensure that the second end of the connecting rod can be smoothly reset to the bent portion after tripping for subsequent operations. In fact, the inclined surface may not be provided, and only an arc-shaped transition surface may be provided at the end of the contact surface, as long as the second end of the connecting rod does not enter the bent portion. The width of the fork is used to ensure that the gate can be opened smoothly. The function of the lever arm is to move the second end of the connecting rod in case the connecting rod is stuck during opening the gate, thereby ensuring that the gate can be opened smoothly and no dangerous incidents will occur.

[0010] A further configuration of the present invention is that: the resistance arm and the push arm are staggered, a positioning boss is provided below the slide slot of the moving contact seat, part of the upper side surface of the positioning boss is integrated with the lower side surface of the curved portion of the slide slot to form a pressure surface, and the pressure surface cooperates with the resistance surface to lock the second end of the connecting rod of the circuit breaker so that the second end of the connecting rod of the circuit breaker is placed in the curved portion of the slide slot, and the push arm is placed on the outer side surface of the positioning boss.

[0011] By adopting the above solution, the structure is compact. In addition, part of the upper side surface of the positioning boss and the lower side surface of the curved portion are integrated to form a pressing surface, which greatly increases the area of ​​the pressing surface, makes the pressing force better, and makes the product performance more stable.

[0012] A further arrangement of the present invention is that grooves are arranged on both sides of the bottom of the slide groove, an arc-shaped convex column is arranged around the bottom of the mounting column, a notch is formed between the arc-shaped convex column and the arc-shaped convex column, a circular through hole is arranged on the lock buckle, the lock buckle is sleeved on the arc-shaped convex column through the circular through hole, a convex rib is arranged on the moving contact seat and located at the periphery of the mounting column, the inner side surface of the lock buckle contacts the convex rib, an opening for inserting a push rod is opened on one side of the accommodating cavity on the bracket, a cylinder for spring sleeve is arranged on the first end of the push rod, one end of the spring abuts against the inner side surface of the accommodating cavity, and the other end is sleeved on the cylinder, a limited position edge is arranged below the first end of the push rod, a step is arranged on the inner side surface of the push rod, a boss cooperating with the step to limit the movement stroke of the push rod is arranged on the inner wall of the accommodating cavity, and the second end of the push rod is arranged into an arc surface.

[0013] By adopting the above scheme, the groove can accumulate dust and will not affect the movement of the second end of the connecting rod. The lock buckle and the moving contact seat are arranged in the above scheme to reduce friction. In addition, there will be no impurities sticking to the lock buckle and the moving contact seat. The bracket, the push rod and the spring are arranged in the above manner, which can work well for the lock buckle. In addition, after the circuit breaker is closed, the push rod will not press the lock buckle, so that there is basically no external force on the lock buckle, so the force to push the lock buckle only needs to be very small.

[0014] The final setting of the present invention is: the moving contact is sleeved on the mounting column and its side surface abuts or is close to: the end of the arc-shaped convex column, a limiting block is arranged below the positioning boss, a positioning opening is formed between the limiting block and the moving contact seat, a positioning block is provided on the moving contact seat below the positioning boss, a bayonet is arranged on the moving contact, a concave cavity is arranged on the moving contact seat at a position corresponding to the bayonet, the torsion spring is also sleeved on the mounting column, the first torsion arm of the torsion spring abuts on the positioning opening, the second torsion arm of the torsion spring abuts on the bayonet of the moving contact, and the end of the second torsion arm is bent and inserted into the concave cavity, a positioning sheet is arranged on the moving contact and between the positioning boss and the positioning block, and the positioning sheet limits the rotation angle of the moving contact by abutting against the positioning boss or the positioning block.

[0015] By adopting the above solution, the moving contact is installed reasonably, especially when the mechanism is in the case of large current, the mechanism can first push the moving contact to disconnect, thereby increasing the safety of the product.

[0016] The present invention will be further described below in conjunction with specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of an embodiment of the present invention;

[0018] Figure 2 This is a three-dimensional diagram of a moving contact and a moving contact seat according to an embodiment of the present invention;

[0019] Figure 3A three-dimensional diagram of a moving contact seat according to an embodiment of the present invention;

[0020] Figure 4 This is a structural diagram of a lock according to an embodiment of the present invention;

[0021] Figure 5 This is a structural diagram of the lock and the moving contact seat in the embodiment of the present invention;

[0022] Figure 6 Schematic diagram of thrusts F1, F2 and angle A according to an embodiment of the present invention;

[0023] Figure 7 This is a structural diagram of the lock catch and the moving contact seat in the disconnected position of the product according to the embodiment of the present invention;

[0024] Figure 8 This is a structural diagram of the lock catch and the moving contact seat of the product of the embodiment of the present invention when they are just beginning to close;

[0025] Fig. 9 This is a structural diagram of the lock catch and the moving contact seat in the closing process of the product of the embodiment of the present invention;

[0026] Fig.10 This is a structural diagram of the lock and the moving contact seat after the product of the embodiment of the present invention is closed;

[0027] Fig.11 This is a structural diagram of the lock and the moving contact seat when the product of the embodiment of the present invention is about to be tripped;

[0028] Fig.12 This is a structural diagram of the lock and the moving contact seat when the product of the embodiment of the present invention is forced to trip;

[0029] Fig.13 This is a structural diagram of the lock and the moving contact seat cooperating during the handle return process after the product of the embodiment of the present invention is tripped;

[0030] Fig.14 This is a structural diagram of the lock catch and the moving contact seat cooperating when the moving contact of the mechanism is knocked open by the electromagnetic mechanism when the product of the embodiment of the present invention is short-circuited;

[0031] Fig.15 It is a structural diagram of the lock catch and the moving contact seat when the moving contact of the mechanism is knocked open by the electromagnetic mechanism when the product of the embodiment of the present invention is short-circuited and the moving contact has not returned to its original position;

[0032] Fig.16 It is an exploded view of the lock push rod mechanism of an embodiment of the present invention. DETAILED DESCRIPTION

[0033] like Figure 1-Figure 16As shown, a linkage device between a lock and a moving contact of a circuit breaker includes a handle 6, a lock 1, a lock push rod mechanism 7, a moving contact seat 2 and a moving contact 3. A connecting rod 4 is arranged between the handle 6 and the moving contact seat 2. The first end of the connecting rod 4 is connected to the handle 6, and the second end of the connecting rod 4 is connected to the moving contact seat 2. The lock 1 and the moving contact 3 are both arranged on the moving contact seat 2. The moving contact 3 and the moving contact seat 2 are linked by a torsion spring 5. In the embodiment of the present invention, In the example, a mounting column 21 is integrally provided on the moving contact seat 2, the lock buckle 1 and the moving contact 3 are movably sleeved on the mounting column 21, the upper end of the moving contact seat 2 is provided with a slide groove 211 for the end of the connecting rod 4 to slide, the slide groove 211 includes a curved portion 2111 and a straight portion 2112, the upper end of the lock buckle 1 is provided with a contact arm 11, and the contact arm 11 is provided with a contact surface 111, the lock buckle push rod mechanism 7 includes a bracket 71, a spring 72 and The push rod 73 and the bracket 71 are arranged on the side of the lock 1 in the circuit breaker housing, and the bracket 71 is provided with a receiving chamber 711. The spring 72 and the push rod 73 are arranged in the receiving chamber 711. The end of the push rod 73 is extended out of the receiving chamber 711 of the bracket 71 under the action of the spring 72. After the circuit breaker is disconnected, the end of the push rod 73 abuts against the side of the lock 1, so that the contact surface 111 of the contact arm 11 of the lock 1 cooperates with the bent portion 2111 of the slide groove 211 to engage the connecting rod 4. The second end of the connecting rod 4 is locked, and at this time, the handle 6 can be pushed, and the handle 6 drives the movable contact seat 2 to rotate through the connecting rod 4, and the movable contact seat 2 drives the movable contact 3 to rotate to realize the circuit breaker closing; after the circuit breaker is closed, the offline mechanism of the circuit breaker can act on the lock buckle 1 to make the lock buckle 1 rotate, and the contact surface 111 loses the lock on the second end of the connecting rod 4. At this time, the second end of the connecting rod 4 slides into the straight part 2112 of the slide groove 211, and the movable contact seat 2 rotates to drive the movable contact 3 to rotate to realize the circuit breaker disconnection. By adopting the above scheme, a new way is adopted to realize the locking or unlocking of the end of the circuit breaker connecting rod, so that the structure is simple, convenient and reliable. In addition, by cooperating with the contact surface 111 of the lock buckle 1 and the slide groove 211, it is only necessary to control the rotation of the lock buckle 1, which is very practical. In the above scheme, the thrust of the top rod 73 on the lock buckle 1 can also be reduced after the lock buckle 1 rotates, that is, the releaser only needs a small force to push the lock buckle, so that the requirements for the releaser are greatly reduced.

[0034] In the embodiment of the present invention, the curved portion 2111 of the slide 211 is bent downward at one end close to the handle 6, and a limited surface 21111 and a pressing surface 21112 are provided on the lower side of the curved portion. The limited surface 21111 is the lowest point of the second end of the connecting rod 4 at the curved portion 2111 of the slide 211 after the circuit breaker is opened. After the circuit breaker is opened, the first end of the connecting rod 4 connected to the handle 6 is higher than the second end of the connecting rod 4 at the curved portion 2111 of the slide. Here, the high and low positions are Figure 1As a reference, during and after the circuit breaker is closed, the second end of the connecting rod 4 abuts against the pressing surface 21112. At this time, the angle A between the thrust F1 direction generated by the handle 6 on the second end of the connecting rod 4 and the thrust F2 direction generated by the pressing surface 21112 on the second end of the connecting rod 4 is less than 180 degrees. After the circuit breaker is closed, the end of the top rod 73 of the lock push rod mechanism 7 is separated from the side of the lock 1. By adopting the above scheme, the stability of the circuit breaker can be well guaranteed, wherein the setting of the limit surface 21111 and the pressing surface 21112 ensures that the handle 6 is operated During operation, the connecting rod 4 can be controlled, wherein the limit surface 21111 is used to limit the position of the second end of the connecting rod 4. If its position is not guaranteed, it cannot be operated. The pressing surface 21112 is used to ensure that the second end of the connecting rod 4 generates thrust during and after the circuit breaker is closed, and the direction of the thrust must also be handled properly, so that the circuit breaker can be closed normally and the lock 1 can be quickly released after closing. In this application document, the pressing surface 21112 can also be connected to the limit surface 21111. The setting of the above position also ensures that the circuit breaker can work normally.

[0035] In the embodiment of the present invention, an inclined surface 112 is provided on the outer side of the contact surface 111 on the contact arm 11, allowing the second end of the connecting rod 4 to slide into the curved portion 2111 of the sliding groove 211. A lever arm 12 is provided above the lock buckle 1 and below the contact arm 11. The contact arm 11 and the lever arm 12 are forked to form a fork, and the width of the fork is greater than the diameter of the second end of the connecting rod 4. When the circuit breaker is opened, the upper side of the lever arm 12 can push the second end of the connecting rod 4 to cause the second end of the connecting rod 4 to slide into the straight portion 2112 of the sliding groove. By adopting the above scheme, the inclined surface 112 ensures that the second end of the connecting rod 4 can be smoothly reset to the bent portion 2111 after tripping, and subsequent operations can be carried out. In fact, the inclined surface 112 can also be omitted, and only an arc-shaped transition surface can be provided at the end of the contact surface 111. It is only necessary to ensure that the second end of the connecting rod 4 enters the bent portion 2111. The width of the fork is to ensure that the gate can be opened smoothly. The function of the lever arm 12 is to move the second end of the connecting rod 4 in case the connecting rod 4 is stuck during opening the gate, thereby ensuring that the gate can be opened smoothly and no dangerous incidents will occur.

[0036] In the embodiment of the present invention, the contact arm 11 and the lever arm 12 are staggered, and a positioning boss 22 is provided below the slide slot 211 of the movable contact seat 2. Part of the upper side surface of the positioning boss 22 is integrated with the lower side surface of the curved portion of the slide slot 211 to form a pressing surface 21112. The pressing surface 21112 cooperates with the contact surface 111 to lock the second end of the connecting rod 4 of the circuit breaker so that the second end of the connecting rod 4 of the circuit breaker is placed in the curved portion 2111 of the slide slot 211, and the lever arm 12 is placed on the outer side surface of the positioning boss 22. By adopting the above scheme, the structure is compact, and part of the upper side surface of the positioning boss 22 is integrated with the lower side surface of the curved portion 2111 to form a pressing surface 21112, which greatly increases the area of ​​the pressing surface 21112, so that the pressing force is better and the product performance is more stable.

[0037] In the embodiment of the present invention, grooves 2113 are provided on both sides of the bottom of the slide groove 211, an arc-shaped convex column 212 is provided around the bottom of the mounting column 21, and a gap is formed between the arc-shaped convex column 212 and the arc-shaped convex column 212. A circular through hole 14 is provided on the lock buckle 1, and the lock buckle 1 is sleeved on the arc-shaped convex column 212 through the circular through hole 14. A convex rib 213 is provided on the movable contact seat 2 and located around the mounting column 21, and the inner side of the lock buckle 1 is in contact with the convex rib 213. A side of the accommodating cavity 711 on the bracket 71 is provided with a The opening into which the push rod 73 is inserted, and a cylinder 731 for the spring 72 to be mounted is provided on the first end of the push rod 73. One end of the spring 72 abuts against the inner side surface of the accommodating chamber 711, and the other end is mounted on the cylinder 731. A limited edge 732 is provided below the first end of the push rod 73 to facilitate the installation of the spring 72. A step 733 is provided on the inner side surface of the push rod 73, and a boss 712 is provided on the inner wall of the accommodating chamber 711 to cooperate with the step 733 to limit the movement stroke of the push rod 73. The second end of the push rod 73 is provided with an arc surface 734. By adopting the above scheme, the setting of the groove 2113 can accumulate dust and will not affect the movement of the second end of the connecting rod. The lock buckle 1 and the moving contact seat 2 are set by the above scheme to reduce friction. In addition, there will be no impurities sticking to the lock buckle 1 and the moving contact seat 2. The bracket 71, the top rod 73 and the spring 72 are set in the above manner, which can work well for the lock buckle 1. In addition, after the circuit breaker is closed, the top rod 73 will not press the lock buckle 1, so that there is basically no external force on the lock buckle 1, so the force pushing the lock buckle 1 is only very small.

[0038] In the embodiment of the present invention, the moving contact 3 is sleeved on the mounting column 21 and its side surface abuts against or is close to the end of the arc-shaped boss 212. A limiting block 221 is arranged below the positioning boss 22, and a positioning opening is formed between the limiting block 221 and the moving contact seat 2. A positioning block 23 is provided on the moving contact seat 2 below the positioning boss 22. A bayonet 31 is provided on the moving contact 3. A concave cavity is provided on the moving contact seat 2 at a position corresponding to the bayonet 31. The torsion spring 5 is also sleeved on the mounting column 21. The first torsion arm of the torsion spring 5 abuts against the positioning opening, and the second torsion arm of the torsion spring 5 abuts against the bayonet 31 of the moving contact 3, and the end of the second torsion arm is bent and inserted into the concave cavity. A positioning sheet 32 ​​is provided on the moving contact 3 and between the positioning boss 22 and the positioning block 23. The positioning sheet 32 ​​limits the rotation angle of the moving contact 3 by abutting against the positioning boss 22 or the positioning block 23. By adopting the above solution, the moving contact 3 is installed reasonably, especially when the mechanism is in the case of large current, the mechanism can first push the moving contact 3 to disconnect, so as to speed up the opening speed, improve the product breaking capacity and increase the safety of the product.

Claims

1. A linkage device between a lock catch and a moving contact of a circuit breaker, characterized in that: The invention comprises a handle, a lock, a lock push rod mechanism, a moving contact seat and a moving contact, a connecting rod is arranged between the handle and the moving contact seat, a first end of the connecting rod is connected to the handle, and a second end of the connecting rod is connected to the moving contact seat, the lock and the moving contact are both arranged on the moving contact seat, and a linkage arrangement is realized between the moving contact and the moving contact seat through a torsion spring, a mounting column is arranged integrally with the moving contact seat, the lock and the moving contact are movably sleeved on the mounting column, a sliding groove for sliding the end of the connecting rod is arranged at the upper end of the moving contact seat, and the sliding groove comprises a curved portion and a straight portion, a resistance arm is arranged at the upper end of the lock, and a resistance surface is arranged on the resistance arm, the lock push rod mechanism comprises a bracket, a spring and a push rod, and the bracket is arranged on the circuit breaker. The side of the lock in the shell is provided with an accommodating cavity on the bracket, and the spring and the push rod are arranged in the accommodating cavity. Under the action of the spring, the end of the push rod protrudes from the bracket accommodating cavity. After the circuit breaker is disconnected, the end of the push rod abuts against the side of the lock, so that the abutting surface of the lock abutting arm cooperates with the curved portion of the slide groove to lock the second end of the circuit breaker connecting rod. At this time, the handle can be pushed, and the handle drives the moving contact seat to rotate through the connecting rod, and the moving contact seat drives the moving contact to rotate to realize the circuit breaker closing; after the circuit breaker is closed, the offline mechanism of the circuit breaker can act on the lock to make the lock rotate, and the abutting surface loses the lock on the second end of the connecting rod. At this time, the second end of the connecting rod slides into the straight portion of the slide groove, and the moving contact seat rotates to drive the moving contact to rotate to realize the circuit breaker disconnection.

2. The linkage device of the lock and the moving contact according to claim 1 is characterized in that: The curved portion of the slide groove is bent downward at one end close to the handle, and a limiting surface and a pressing surface are arranged on the lower side of the curved portion. The limiting surface is the lowest point position of the second end of the connecting rod in the curved portion of the slide groove after the circuit breaker is opened. After the circuit breaker is opened, the first end of the connecting rod connected to the handle is higher than the second end of the connecting rod in the curved portion of the slide groove. During and after the circuit breaker is closed, the second end of the connecting rod abuts against the pressing surface. At this time, the angle between the thrust direction generated by the handle on the second end of the connecting rod and the thrust direction generated by the pressing surface on the second end of the connecting rod is less than 180 degrees. After the circuit breaker is closed, the top rod end of the lock push rod mechanism is separated from the lock side.

3. The linkage device of the lock and the moving contact according to claim 1 or 2, characterized in that: An inclined surface is provided on the outer side of the contact surface of the contact arm for allowing the second end of the connecting rod to slide into the curved part of the slide groove. A push arm is provided above the lock buckle and below the contact arm. The contact arm and the push arm are forked to form a fork. The width of the fork is greater than the diameter of the second end of the connecting rod. When the circuit breaker is opened, the upper side of the push arm can push the second end of the connecting rod to cause the second end of the connecting rod to slide into the straight part of the slide groove.

4. The linkage device between the lock catch and the moving contact of the circuit breaker according to claim 2, characterized in that: The resistance arm and the push arm are staggered, a positioning boss is arranged below the slide slot of the moving contact seat, part of the upper side surface of the positioning boss is integrated with the lower side surface of the curved portion of the slide slot to form a pressure surface, and the pressure surface cooperates with the resistance surface to lock the second end of the connecting rod of the circuit breaker so that the second end of the connecting rod of the circuit breaker is placed in the curved portion of the slide slot, and the push arm is placed on the outer side surface of the positioning boss.

5. The linkage device between the lock catch and the moving contact of the circuit breaker according to claim 1 or 2, characterized in that: Grooves are provided on both sides of the bottom of the slide slot, and an arc-shaped convex column is provided around the bottom of the mounting column, and a notch is formed between the arc-shaped convex column and the arc-shaped convex column, and a circular through hole is provided on the lock buckle, and the lock buckle is sleeved on the arc-shaped convex column through the circular through hole; a convex rib is provided on the moving contact seat and located on the periphery of the mounting column, and the inner side surface of the lock buckle contacts the convex rib; an opening for inserting a push rod is opened on one side of the accommodating cavity on the bracket; a cylinder for spring sleeve is provided on the first end of the push rod, one end of the spring abuts against the inner side surface of the accommodating cavity, and the other end is sleeved on the cylinder; a limited position edge is provided below the first end of the push rod, a step is provided on the inner side surface of the push rod, and a boss cooperating with the step to limit the movement stroke of the push rod is provided on the inner wall of the accommodating cavity, and the second end of the push rod is provided with an arc surface.

6. The linkage device between the lock catch and the moving contact of the circuit breaker according to claim 5, characterized in that: The moving contact is sleeved on the mounting column and its side surface abuts against or is close to the end of the arc-shaped convex column. A limiting block is arranged below the positioning boss, and a positioning opening is formed between the limiting block and the moving contact seat. A positioning block is provided on the moving contact seat below the positioning boss, a bayonet is arranged on the moving contact, and a concave cavity is arranged on the moving contact seat at a position corresponding to the bayonet. The torsion spring is also sleeved on the mounting column, and the first torsion arm of the torsion spring abuts against the positioning opening, and the second torsion arm of the torsion spring abuts against the bayonet of the moving contact, and the end of the second torsion arm is bent and inserted into the concave cavity, and a positioning sheet is arranged on the moving contact and between the positioning boss and the positioning block. The positioning sheet limits the rotation angle of the moving contact by abutting against the positioning boss or the positioning block.

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