CN210985429U - Automatic switch-on position lock of circuit breaker - Google Patents

Abstract

An automatic switch-on position lock for a circuit breaker comprises a lock rod piece and a reset elastic piece. Before the circuit breaker body and the drawer seat are connected in place, the locking rod piece is always located at a position where switching-on is forbidden under the action of self weight and reset force of the reset elastic piece, and a tripping lever of an operating mechanism on the circuit breaker body is limited at a tripping position, so that the circuit breaker can not be switched on. When the circuit breaker body and the drawer seat are connected in place, the locking rod piece overcomes the dead weight and the reset force of the reset elastic piece under the pushing of the roller on the driving plate, moves upwards, leaves the tripping lever, releases the locking of the tripping lever and reaches a closing unlocking position. The position of the locking rod piece changes along with the position of the breaker body through the driving plate. Compared with the prior art, the device has fewer parts, more compact structure, simpler process, more reliable work and more convenient maintenance and disassembly; the locking and unlocking of the switching-on function of the operating mechanism are controlled directly by the driving plate for controlling the moving position of the breaker body, and the control precision is higher.

Description

Automatic switch-on position lock of circuit breaker

Technical Field

The invention belongs to the field of low-voltage electric appliances, and particularly relates to a circuit breaker with a drawer seat.

Background

In the circuit breaker with the drawer seat, when the circuit breaker body does not reach the connection position of the drawer seat and is connected with the drawer seat in place, the operating mechanism is not allowed to be switched on, and therefore the purpose of personal safety protection is achieved.

Thus, the circuit breaker body typically has three positions, namely, an isolation position, a test position, and a make position, into and out of the drawer base. In the isolation position, the busbar of the circuit breaker body is separated from the electric connection device of the drawer seat, and has a certain isolation distance, so that the main circuit is cut off; at the same time, the control circuit of the circuit breaker is also separated from the application circuit. In the connection position, the busbar of the circuit breaker body is connected with the electric connection device of the drawer seat, the main circuit is in a connection and connection state, and meanwhile, the control circuit and the application circuit are also in a connection state. The test position is located between the isolation position and the connection position, in the test position, the busbar of the circuit breaker body is separated from the electric connection device of the drawer seat, and the control circuit and the application loop are in a connection state. The main circuit should be cut off before the circuit breaker body reaches the on position from the off position.

The automatic switch-on position lock of the existing circuit breaker can realize whether the switch-on function of an operating mechanism on a circuit breaker body is locked or unlocked or not, and changes along with the position of the circuit breaker body, so that the circuit breaker body can be switched on only when being connected with a drawer seat and clamped in place. The prior art has complex structure and more transmission links, and the locking and unlocking are realized by an intermediate transmission part, thereby influencing the locking precision and the locking speed.

Disclosure of Invention

The invention aims to provide the automatic switch-on position lock for the circuit breaker, which has high locking precision, high speed and reliable locking.

In order to achieve the technical purpose, the invention designs a brand-new automatic switch-on position lock for a circuit breaker, which comprises a drawer seat, a lock rod piece, a driving plate, a reset elastic piece, an intermediate gear, a driving gear, a main shaft, a tripping lever and a circuit breaker body side plate.

The circuit breaker body can be operated by a driving device on the drawer seat, so that the circuit breaker body enters the drawer seat and is electrically connected; or operated by the driving means away from the drawer seat and electrically disconnected.

The locking rod piece is provided with an acting surface, a working surface, a transition surface, a first mounting hole and a hanging hole. The action surface comprises a plane and an arc surface and is used for being in action coupling relation with the breaker body. The working surface is in driving transmission relation with the driving plate. The action surface and the working surface are positioned at two ends of the lock rod piece. The first mounting hole is located at one end of the working face, and the lock rod piece is mounted on the drawer seat through the first mounting hole by the rotating shaft. The hanging hole is positioned at one end of the action surface and used for installing the reset elastic piece and providing reset force for the lock rod piece.

The drive plate has an arcuate outer contour and is provided with a gear, and a second roller of the drive plate is provided adjacent the gear and is operative to drive the working surface such that the drive plate is in driving relationship with the locking lever member. The driving plate is also provided with a second mounting hole which is coaxially mounted on the drawer seat with the first mounting hole of the lock rod piece. In addition, the driving plate is provided with an arc-shaped groove with one open end, and the first roller of the body side plate can enter the arc-shaped groove through the open end and is pushed by the driving plate.

The arc wall has the outside limit that the pitch arc limit of three-section different curvatures constitutes, and wherein the camber on second arc limit is greater than the camber on first arc limit, and the camber on third arc limit is greater than the camber on second arc limit for the transition of the first roller of body curb plate on three arc edges is more smooth and easy, and the thrust of arc limit to first roller more concentrates on pushing the circuit breaker body into the drawer seat, and thrust is greater than the component of perpendicular and body direction of motion at the component of body direction of motion promptly.

The arc groove has the inboard side that the different camber arc limits of other three-section constitute, and wherein the camber on fifth arc limit is greater than the camber on fourth arc limit, and the camber on sixth arc limit is greater than the camber on fifth arc limit for the transition of the first roller of body curb plate on three arc edges is more smooth and easy, and the arc limit is more concentrated in pushing out the drawer seat to the circuit breaker body to the thrust of first roller, and thrust is greater than the component of perpendicular and body direction of motion in the component of body direction of motion promptly.

The drawer base is provided with a driving device, and the driving device comprises a main shaft and driving gears arranged on two sides of the main shaft. The driving gear takes the axis of the main shaft as a rotation center and rotates together with the main shaft, and transmits motion to the driving plate through the intermediate gear. The driving gear, the intermediate gear and the driving plate gear are coupled to form a gear transmission system.

In addition, the breaker body is provided with an operating mechanism which is used for switching on and switching off the breaker, wherein the operating mechanism is also provided with a tripping mechanism which is used for executing the tripping action of the breaker caused by tripping under the conditions of fault current, emergency, maintenance state and the like, so that the tripping mechanism can be actuated by arranging a driving piece.

Further, the lock rod and the driving plate are provided with coaxial mounting holes, share a rotating shaft (not shown), and are connected to a side plate of the circuit breaker drawer seat, so that the lock rod and the driving plate can be mounted and rotated on the circuit breaker drawer seat. The second roller of the drive plate may be mounted as a separate component to the drive plate for rotation therewith and positioned relative to the locking bar member for contacting engagement with the working surface of the locking bar member to drive rotation of the locking bar member. A first roller is installed on a side plate of the circuit breaker body, the position of the first roller corresponds to that of the locking rod piece, and the first roller can move in an arc-shaped groove of the driving plate.

The action surface of the locking rod piece is used for pushing the tripping lever to limit the operating mechanism on a tripping position, so that the circuit breaker can not be switched on. The lock rod piece is provided with a working surface and is matched with the driving plate to realize the upward movement unlocking of the lock rod piece.

And the reset elastic piece is arranged on the lock rod piece and provides reset force in a locking state direction for enabling the lock rod piece to release the operating mechanism. When the circuit breaker body leaves the connecting position, reset force is provided to drive the locking rod part to reset, and the locking of the switching-on function of the circuit breaker body operating mechanism is implemented.

When the circuit breaker body pushes the draw-out device, firstly, the locking rod piece pushes the tripping lever of the circuit breaker body operating mechanism to trip and lock in a tripping state, and the circuit breaker body cannot be switched on. The circuit breaker body moves towards the draw-out device under the pushing of the driving plate, and after a second roller on the driving plate touches the working surface of the locking rod piece, the locking rod piece starts to rotate clockwise around the mounting shaft, and gradually leaves the circuit breaker body operating mechanism tripping lever. When the action surface of the locking rod part leaves the tripping lever, the switching-on function of the operating mechanism of the circuit breaker body is unlocked.

When the circuit breaker body is pulled out of the draw-out device, the circuit breaker body moves in a direction away from the draw-out device under the pushing of the driving plate. Meanwhile, the second roller of the driving plate gradually moves towards the direction away from the working surface of the locking rod piece, the locking rod piece rotates anticlockwise to reset under the action of the reset elastic piece or the self gravity, and the locking rod piece still leans against the second roller of the driving plate. When the second roller of the driving plate is away from the working surface of the unlocking rod piece, the locking rod piece is reset to the right position. In this process, the action face of the locking lever member gradually approaches the trip lever of the circuit breaker body operating mechanism. When the action surface of the locking rod piece touches the tripping lever, the tripping lever is gradually pushed to move towards the tripping direction, finally, the tripping lever is tripped, the working surface of the locking rod piece is locked by the tripping lever, and the operating mechanism of the circuit breaker body cannot be switched on.

Compared with the prior art, the locking and unlocking device has the advantages that the locking and unlocking of the switching-on function of the operating mechanism of the circuit breaker body along with the position change of the circuit breaker body are realized by the aid of the locking rod piece, the structure is more compact, the processing technology is simpler, the work is more reliable, and the maintenance and the disassembly are more convenient.

The circuit breaker has the beneficial effects that the locking and unlocking of the switching-on function of the operating mechanism are controlled directly by the driving plate for controlling the moving position of the circuit breaker body, so that the control precision is higher, and the circuit breaker is safer and more reliable.

Drawings

FIG. 1 is a schematic structural view of the locking state of the automatic locking device for the closing position of the circuit breaker according to the present invention

FIG. 2 is the structure diagram of the unlocking state of the automatic lock for the closing position of the circuit breaker

FIG. 3 is a schematic structural view of the lock rod of the present invention

FIG. 4 is a schematic structural diagram of the driving plate of the present invention

FIG. 5 is a schematic view of the force analysis of the first roller pushed by the arc-shaped slot of the present invention 1

FIG. 6 is a schematic view of the force analysis of the first roller pushed by the arc-shaped slot of the present invention, FIG. 2

FIG. 7 is a schematic view of the force analysis of the first roller pushed by the arc-shaped slot of the present invention shown in FIG. 3

FIG. 8 is a schematic view of the force analysis of the first roller pushed by the arc-shaped slot of the present invention shown in FIG. 4

Detailed Description

According to fig. 1 and 2, the utility model relates to a close floodgate position automatic locking of circuit breaker, including drawer seat 1, locking lever spare 2, drive plate 3, elastic component 5 resets, intermediate gear 6, drive gear 7, main shaft 8, tripping lever 9, circuit breaker body curb plate 10.

The circuit breaker comprises a drawer seat 1, which can also be called a drawout device, wherein a circuit breaker body can be operated by a driving device on the drawer seat 1 so as to enter the drawer seat 1 and realize electric connection; or operated by the driving means away from the drawer base 1 and electrically disconnected. The circuit breaker body generally all installs the curb plate in both sides, like the utility model discloses curb plate 10 in the drawing, except increasing the rigidity of circuit breaker body, still take place the transmission of action through some structural feature of self and drawer seat 1, for example in fig. 1, have first roller 1001 on the curb plate 10 and formed the action coupled relation with drawer seat 1.

The lock rod part 2 according to fig. 1, 2 and 3 has an active surface 201, a working surface 202, a transition surface 203, a first mounting hole 204, a suspension hole 205. The action surface 201 comprises a plane and a circular arc surface and is used for being in action coupling relation with the breaker body. The working surface 202 is planar and is in driving relationship with the drive plate 3. The action surface 201 and the working surface 202 are positioned at two ends of the lock rod piece 2, and the transition surface 203 connects the two ends of the lock rod piece 2 into a whole. The first mounting hole 204 is formed at one end of the working surface 202, and the locking lever member 2 is rotatably mounted on the drawer base 1 through the first mounting hole 204. The hanging hole 205 is formed at a section of the action surface 201 for mounting the return elastic member 5 to provide a return force to the lock lever member 2.

According to fig. 1, 2 and 4, the driving plate 3 has an arc-shaped outer contour, which may be a gear structure or a partial gear structure, and from the economical point of view, the present invention adopts a partial gear structure, such as the gear 302 in fig. 1, having the second roller 301 near the gear 302, and the second roller 301 has a driving effect on the working surface 202, so that the driving plate 3 and the lock rod member 2 establish a transmission relationship. The driving plate 3 further has a second mounting hole 303 coaxially mounted on the drawer base 1 with the first mounting hole 204 of the locking lever member 2. In addition, the driving plate 3 has an arc-shaped slot 304 with one end opened, the arc-shaped slot 304 has a circular arch in the same direction as the outer contour of the driving plate 3, and the first roller 1001 can enter the arc-shaped slot 304 through the opened end and be pushed by the driving plate 3. The arcuate slot 304 has two elongated arcuate sides, referred to as an outboard side and an inboard side. The outer side edges comprise a first arc-shaped edge 3041a, a second arc-shaped edge 3042a and a third arc-shaped edge 3043a, the arc-shaped edges of all the sections are not concentric, and the two arc-shaped edges are in smooth and continuous transition; the inner side edge includes a fourth arc edge 3041b, a fifth arc edge 3042b and a sixth arc edge 3043b, the arc edges of the sections are not concentric, and the two arc edges are in smooth and continuous transition. The arcuate edges 3043a and 3043b are connected by an arc segment 3044. The arc-shaped sides 3041a and 3041b are concentric arcs of different radii, the arc-shaped sides 3042a and 3042b are concentric arcs of different radii, and the arc-shaped sides 3043a and 3043b are concentric arcs of different radii. The radian of the arc edges 3041a, 3042a, 3043a, 3041b, 3042b, 3043b is designed to ensure that the angle of the first roller 1001 is less than 45 degrees, and the vertical component of the driving force is controlled within a small range.

According to fig. 5, when the driving plate 3 rotates clockwise, the first roller 1001 is pushed by the first arc edge 3041a of the arc-shaped groove 304, so that when the circuit breaker body is inserted into the drawer base 1, the direction of the pushing force forms an angle smaller than 45 ° with the movement of the circuit breaker body, and the component force of the pushing force in the movement direction of the circuit breaker body is larger than the component force perpendicular to the movement direction.

According to fig. 6, the driving plate 3 continues to rotate clockwise, the first roller 1001 contacts and is pushed by the second arc edge 3042a of the arc edge, so that the circuit breaker body continues to go deep into the drawer base 1, the thrust direction and the movement of the circuit breaker body still have an included angle of less than 45 °, and thus the component force of the thrust force in the movement direction of the circuit breaker body is greater than the component force perpendicular to the movement direction. It should be noted that the angle of rotation of the drive plate 3 is not large and the transition between the two arcuate edges is difficult, so that the arcuate edge 3042a is configured to have a smaller curvature than the arcuate edge 3041a, allowing the first roller 1001 to smoothly transition from contact with the arcuate edge 3041a to contact with the arcuate edge 3042 a.

According to fig. 7, the driving plate 3 continues to rotate clockwise, the first roller 1001 contacts and is pushed by the third arc edge 3043a of the arc edge, so that the circuit breaker body further penetrates into the drawer base 1, the included angle between the thrust direction and the motion of the circuit breaker body is still less than 45 °, and thus the component force of the thrust force in the motion direction of the circuit breaker body is greater than the component force perpendicular to the motion direction. It should be noted that when the driving plate 3 has rotated through most of the angle, i.e. the angle between the arc-shaped edge and the direction perpendicular to the movement direction of the body is smaller than the angle between the arc-shaped edge and the movement direction of the body, the two arc-shaped edges are easier to transition, so that the arc-shaped edge 3043a is configured to have a larger curvature than the arc-shaped edge 3042a, so that the first roller 1001 is subjected to a larger force penetrating into the drawer base 1.

According to fig. 8, when the driving plate 3 rotates clockwise to the position, or the circuit breaker body reaches the electrical connection position, the first roller 1001 enters the circular arc section 3044, and the pushing force of the circular arc section 3044 to the first roller 1001 is parallel to the direction of the circuit breaker body moving towards the drawer base 1, because there is no component force perpendicular to the direction of the circuit breaker body moving, the driving plate 3 is not stressed in this direction, the driving plate has a longer service life, and finally the circuit breaker body is locked. It should be noted that the circuit breaker body is supported by other parts in the drawer base 1, such as a slide rail, and the driving plate 3 is mainly responsible for inserting or withdrawing the circuit breaker body into or from the drawer base 1, so that it is not difficult to understand that the driving plate 3 is not stressed in the vertical direction.

According to the above analysis, when the circuit breaker body is pushed out of the drawer base 1 by the driving board 3, the first roller 1001 is sequentially pushed by the fourth arc-shaped edge 3043b, the fifth arc-shaped edge 3042b and the sixth arc-shaped edge 3041b of the inner side edge, and the curvature, the transition relation and the thrust angle relation of these arc-shaped edges are the same as those of the corresponding outer side edges, that is, the curvature of the arc-shaped edge 3043b is greater than that of the arc-shaped edge 3042b, and the curvature of the arc-shaped edge 3042b is smaller than that of the arc-shaped edge 3041b, so the relationship between the thrust direction and the angle of the circuit breaker body exiting the drawer 1 is not repeated.

The drawer base 1 has a drive device comprising a main shaft 8 and a drive gear 7 mounted on both sides of the main shaft 8. The drive gear 7 rotates together with the main shaft 8 around the axis of the main shaft 8, and transmits motion to the drive plate 3 through the intermediate gear 6. The driving gear 7, the intermediate gear 6 and the driving plate 3 form gear coupling as shown in fig. 1 and 2, and a gear transmission system is formed.

In addition, the breaker body is provided with an operating mechanism which is used for switching on and switching off the breaker, wherein the operating mechanism is also provided with a tripping mechanism which is used for executing the tripping action of the breaker caused by tripping due to the breaker under the conditions of fault current, emergency, maintenance state and the like, so that the tripping mechanism can be actuated by arranging a driving piece, such as a tripping lever 9 in fig. 1, and is actuated by the driving of the locking rod piece 2.

It should be further noted that the locking rod member 2 and the driving plate 3 are provided with coaxial mounting holes, share a rotating shaft (not shown), and are connected to a side plate of the circuit breaker drawer base 1, so as to realize the mounting and rotation of the locking rod member 2 and the driving plate 3 on the circuit breaker drawer base 1. The second roller 301 may be mounted to the drive plate 3 as a separate component, the second roller 301 rotating with the drive plate 3. The second roller 301 protrudes from the driving plate 3 by a height greater than the thickness of the lock lever member 2, and is positioned corresponding to the lock lever member 2, and is capable of being in contact-coupled with the working surface 202 of the lock lever member 2, thereby driving the lock lever member 2 to rotate. A first roller 1001 is installed on the side plate 10 of the circuit breaker body, the protruding height of the first roller 1001 on the side plate 10 is larger than the thickness of the driving plate 3, the position of the first roller corresponds to the locking rod piece 2, and the first roller can move in the arc-shaped groove 304 of the driving plate 3.

According to fig. 3, the action surface 201 of the lock lever 2 is used for pushing the trip lever 9 to limit the operating mechanism at the trip position, so as to ensure that the circuit breaker cannot be closed. The lock rod piece 2 is provided with a working surface 202 which is matched with the driving plate 3 to realize the upward movement unlocking of the lock rod piece 2. One end of the elastic reset element 5 is installed on the hanging hole 205 of the lock rod 2, and the other end is installed on the fixed part of the drawer base 1, so as to provide the reset force of the lock rod 2, and the direction of the reset force enables the lock rod 2 to be in a locking state of releasing the operating mechanism.

The second roller 301 drives or disengages the working surface of the lock link 2 to unlock or lock the circuit breaker body operating mechanism trip lever 9 by the lock link 2, and according to fig. 1, fig. 2, and fig. 5 to fig. 8, the specific action process is as follows:

when the circuit breaker body is pushed into the drawer base 1, initially, the circuit breaker and the drawer base 1 are in an isolated position, and the first roller 1001 enters the arc-shaped groove 304. Under the effect of the driving device of the drawer seat 1, the main shaft 8 drives the driving gear 7 to rotate clockwise, the intermediate gear 6 rotates anticlockwise, the driving plate 3 also rotates clockwise, the first roller 1001 is driven by the outer side of the arc-shaped groove 304, so that the circuit breaker body wants to go deep into the direction movement of the drawer seat 1, meanwhile, the outer side and the first roller 1001 form internally-tangent rolling movement, the friction force between the two is reduced, the rotation and the driving of the driving plate 3 are smooth, the first roller 1001 goes deep into the arc-shaped groove 304 continuously, when the second roller 301 on the driving plate 3 does not contact the locking rod part 2, the locking rod part 2 is under the effects of the self gravity and the reset elastic part 5, the action surface 201 pushes the tripping lever 9 of the circuit breaker body operating mechanism downwards to trip, the locking mechanism is locked in a tripping state, and the circuit breaker body cannot. From the isolation position to the test position, the tripping lever 9 is always acted by the locking rod 2, so that the circuit breaker cannot be switched on. In the process from the test position to the connection position, along with the movement of the breaker body in the direction deep into the drawer seat 1 under the pushing of the driving plate 3, the second roller 301 is also close to the locking rod 2 in the continuous movement, when the second roller 301 touches the working surface 202 of the locking rod 2, the locking rod 2 starts to be pushed to rotate clockwise around the mounting shaft, the working surface 202 starts to be separated from the tripping lever until a certain distance is kept between the working surface 202 and the tripping lever 9, and the breaker body reaches the connection position of the drawer seat 1, so that the switching-on function of the operating mechanism of the breaker body is unlocked, and the breaker can execute the switching-on action. Of course, in this process, the first roller 1001 does not rotate substantially, and rotation of the drive plate 3 causes the arcuate slot 304 to rotate, forming the outboard edge of the arcuate slot 304 over which the first roller 1001 passes.

It should be further noted that when the circuit breaker body is pulled out of the drawer base 1, the circuit breaker is initially in the on position with the drawer base 1. Under the effect of the driving device of the drawer seat 1, the main shaft 8 drives the driving gear 7 to rotate anticlockwise, the intermediate gear 6 rotates clockwise, the driving plate 3 also rotates anticlockwise, the inner side of the arc-shaped groove 304 drives the first roller 1001, so that the circuit breaker body moves towards the direction far away from the draw-out device under the pushing of the driving plate 3, meanwhile, the inner side and the first roller 1001 form an externally tangent rolling motion, the friction force between the two is reduced, the rotation and the driving of the driving plate 3 are smooth, and the first roller 1001 continuously moves towards the opening direction of the arc-shaped groove 304. At the same time, the second roller 301 of the driving plate 3 is gradually moved away from the working surface 202 of the lock lever member 2, and the lock lever member 2 is still always held against the second roller 301 since the lock lever member 2 is rotated counterclockwise by the return elastic member 5 or its own weight. When the lock rod 2 is reset to the right position, the second roller 301 on the driving plate 3 is separated from the working surface 202 of the lock rod 2, and the breaker body reaches the test position. In this process, the working face 201 of the lock link member 2 approaches the circuit breaker body operating mechanism trip lever 9 step by step. When the working surface 201 of the locking rod piece 2 touches the tripping lever 9, the tripping lever 9 is gradually pushed to move towards the tripping direction, finally, tripping is carried out, the tripping lever 9 is locked by the working surface 201 of the locking rod piece 2, and the operating mechanism of the circuit breaker body cannot be switched on. Of course, in this process, the first roller 1001 does not rotate substantially, and rotation of the drive plate 3 causes the arcuate slot 304 to rotate, forming the first roller 1001 to pass over the inner side of the arcuate slot 304.

Furthermore, the reset force provided by the reset elastic element 5 should be larger than the tripping force of the tripping lever 9 of the circuit breaker body operating mechanism, and the stroke of the locking rod element 2 should be larger than the tripping stroke of the tripping lever 9 of the circuit breaker body operating mechanism, so as to ensure that the locking rod element 2 can reliably push the tripping lever 9 of the circuit breaker body operating mechanism to trip when the closing function is locked.

Furthermore, the moving stroke of the second roller 301 pushing the lock rod 2 on the driving plate 3 should be greater than the tripping stroke of the tripping lever 9 of the circuit breaker body operating mechanism, so as to ensure that the lock rod 2 can reliably leave the tripping lever of the circuit breaker body operating mechanism when the closing function is unlocked.

While the invention has been described with respect to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention. Those skilled in the art can make various changes, modifications and equivalent arrangements, which are equivalent to the embodiments of the present invention, without departing from the spirit and scope of the present invention, and which may be made by utilizing the techniques disclosed above; meanwhile, any changes, modifications and variations of the above-described embodiments, which are equivalent to those of the technical spirit of the present invention, are within the scope of the technical solution of the present invention.

Claims (10)

1. A switch-on position automatic lock of a circuit breaker comprises a circuit breaker body, a drawer seat (1), a driving plate (3), a driving gear (7), a main shaft (8), a tripping lever (9) and a circuit breaker body side plate (10), wherein the circuit breaker body is pushed into the drawer seat (1) by the drawer seat (1) or pulled out of the drawer seat (1) by the circuit breaker body, the circuit breaker body comprises the tripping lever (9) for tripping and separating the circuit breaker and the side plate (10), the main shaft (8) and the driving gear (7) are installed on the drawer seat (1), the driving gear (7) takes the axis of the main shaft (8) as a rotation center and rotates together with the main shaft (8), the driving plate (3) is rotatably installed on the drawer seat (1) and has a gear structure, the drawer seat (1) transmits driving force to the driving plate (3) through the driving gear (7), and is characterized in that, the circuit breaker is characterized by further comprising a locking rod piece (2) which can drive a tripping lever (9) to enable the circuit breaker body to trip and open, and a driving structure is further arranged on the driving plate (3) and can drive the locking rod piece (2) to leave the tripping lever (9) to unlock the circuit breaker body.

2. The automatic lock for the closing position of the circuit breaker according to claim 1, wherein the driving plate (3) further has an arc-shaped slot (304), the side plate (10) further has a first roller (1001), and the driving plate (3) acts on the first roller (1001) through the arc-shaped slot (304) to push or pull the circuit breaker body into or out of the drawer base (1).

3. The automatic lock for the closing position of the circuit breaker according to claim 2, wherein the arc-shaped groove (304) has a first arc-shaped side (3041a) and a second arc-shaped side (3042b) having different curvatures, and the curvature of the second arc-shaped side (3042b) is smaller than that of the first arc-shaped side (3041 a).

4. The automatic lock for the closing position of a circuit breaker according to claim 3, wherein the arc-shaped slot (304) further comprises a third arc-shaped side (3043a), and the curvature of the third arc-shaped side (3043a) is greater than that of the second arc-shaped side (3042 b).

5. The automatic locking device for the closing position of the circuit breaker according to claim 2, wherein the driving structure on the driving plate (3) is a second roller (301), the locking lever member (2) has an acting surface (201) and a working surface (202), and after the second roller (301) pushes the working surface (202) of the locking lever member (2) to rotate the locking lever member (2), the acting surface (201) is separated from the trip lever (9) to release the locking state.

6. The automatic closing position lock of circuit breaker according to claim 3, characterized in that it further comprises a reset elastic member (5), said lock bar member (2) further comprises a hanging hole (205), one end of the reset elastic member (5) is installed in the hanging hole (205), and the other end is installed on the drawer base (1), providing a reset force to the lock bar member (2) to keep the trip lever (9) at the trip position.

7. The automatic lock for closing position of circuit breaker according to claim 4, further comprising an intermediate gear (6), wherein said driving plate (3) has a gear (302), and the intermediate gear (6) is coupled with the gear (302) of the driving gear (7) and the driving plate (3) respectively to form a gear transmission system, and when the drawer base (1) pushes the circuit breaker body into the drawer base (1) or pulls the circuit breaker body out of the drawer base (1), the driving plate (3) and the driving gear (7) have the same rotation direction.

8. The automatic locking device for the closing position of the circuit breaker according to claim 6, wherein the locking rod member (2) further comprises a transition surface (203) and a first mounting hole (204), the acting surface (201) and the working surface (202) are located at two ends of the transition surface (203), the first mounting hole (204) is located at one end of the working surface (202), and the hanging hole (205) is located at one end of the acting surface (201).

9. The automatic lock for the closing position of the circuit breaker according to claim 5, wherein said driving plate (3) further has a second mounting hole (303) and said first mounting hole (204) of said lock link (2) is coaxially mounted on the drawer base (1), so that said second roller (301) pushes the lock link (2) to allow the lock link (2) to have a large movement stroke.

10. The automatic closing position lock of circuit breaker according to claim 9, wherein the stroke of said lock rod (2) is greater than the trip stroke of the trip lever (9) of the circuit breaker body operating mechanism, and the moving stroke of said second roller (301) of said driving plate (3) pushing said lock rod (2) is greater than the trip stroke of the trip lever (9) of the circuit breaker body operating mechanism.

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