CN102376500B - Safety insertion self-locking device of plug-in moulded case circuit breaker - Google Patents

Abstract

The invention discloses a plug-in molded case circuit breaker safety plug-in self-locking device, comprising: a circuit breaker body is provided with an operating mechanism, including a connecting rod that can rotate around a rotating shaft; a base is provided with a limit step ; A limit piece is rotatably installed on a fixed shaft, the limit piece has a connecting arm and a limit arm, the connecting arm is provided with a waist-shaped hole, a linkage shaft is installed in the waist-shaped hole and Connected with one end of the connecting rod; a bracket is fixed on the bottom of the circuit breaker body, and a stopper is provided on the bracket; the middle part of a lock is rotatably installed on the bracket, and the upper end of the lock extends to the connecting rod and the limit arm Nearby, the lower end of the lock is provided with a hook to match the limit step of the base, and the lock is also provided with a boss matching with the stopper of the bracket; a spring is connected between the lock and the bracket to make the lock The boss on the bracket rests on the stopper of the bracket. The invention has higher safety, fewer parts and simple assembly.

Description

Plug-in molded case circuit breaker safety plug-in self-locking device

technical field

The invention relates to a molded case circuit breaker, in particular to a safe plug-in self-locking structure of a plug-in molded case circuit breaker.

Background technique

In order to ensure the safety of the operator, the relevant standards clearly stipulate that the plug-in molded case circuit breaker produced by the manufacturer is not allowed to be connected during the plug-in and pull-out operations. In order to achieve this requirement, there are two implementation methods for plug-in molded case circuit breakers in the industry. Method 1: Plug-in and pull-out operations are allowed in the on state, but the molded case circuit breaker can be automatically opened during the operation, such as Schneider The company's NSX series, etc.; method two: the insertion and extraction operations are not allowed in the on state, and the insertion and extraction operations can only be performed in the off state, such as ABB's Tmax series. Comparing the two methods, the second method is safer than the first method, because the second method can only be inserted and pulled out after the opening operation is performed. Although ABB's Tmax series products can realize safe plug-in and self-locking, they have many parts, complicated assembly and high cost.

Contents of the invention

The technical problem to be solved by the present invention is to provide a plug-in molded case circuit breaker safety plug-in self-locking device with simple structure, safe and reliable, so as to overcome the above-mentioned defects of the prior art.

In order to solve the above technical problems, the present invention adopts the following technical solution: a plug-in molded case circuit breaker safety plug-in self-locking device, including the following components: circuit breaker body, the circuit breaker body is provided with an operating mechanism, the operating mechanism It includes a connecting rod that can rotate around the rotating shaft; a base, a limit step is arranged in the base; a limiter, rotatably installed on a fixed shaft, the limiter has a connecting arm and a limiter arm, The connecting arm is provided with a waist-shaped hole, and a linkage shaft is passed through the waist-shaped hole and connected with one end of the connecting rod; the bracket is fixed on the bottom of the circuit breaker body, and the bracket There is a stopper on the top; the lock, the middle part of the lock is rotatably installed on the bracket, the upper end of the lock extends to the vicinity of the connecting rod and the limit arm, and the lower end of the lock is provided with a hook and a base Cooperate with the limit steps of the lock, and the lock is also provided with a boss that matches the stopper of the bracket; the spring is connected between the lock and the bracket, so that the boss on the lock is against the on the stopper of the above bracket.

Preferably, the lock catch is mounted on the bracket through a connecting shaft, and the connecting shaft is provided with a plurality of annular grooves, and retaining rings for axial positioning are installed in the annular grooves.

Preferably, the bracket is fixed on the bottom plate of the circuit breaker body by screws.

Preferably, a spring hook is respectively provided on the lock buckle and the bracket, the spring is a tension spring, and two ends of the tension spring are respectively connected to the spring hook.

Further, the buckle is provided with a side arm, the side arm extends outward from the opposite side of the boss, and a round hole is provided on the side arm to match the connecting shaft.

Preferably, the upper end of the lock has a curved portion, and two ends of the curved portion are respectively provided with arc surfaces.

Preferably, the end of the limiting arm is provided with a circular arc surface.

Preferably, the top surface of the limiting step is an inclined surface, and the bottom surface of the limiting step is parallel to the bottom surface of the base.

Compared with the technical technology, the invention has the following beneficial effects: the insertion and extraction operations can only be performed after the opening action is performed, and the safety is higher; the number of parts is small and the assembly is simple.

Description of drawings

The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

Fig. 1 is a schematic diagram of the circuit breaker body that cannot be inserted into the base when the operating mechanism is in the closed state (connected state) of the present invention.

Fig. 2 is a schematic diagram of the circuit breaker body being unable to be pulled out from the base when the present invention is in the on state.

Fig. 3 is a schematic diagram of the circuit breaker body that can be inserted into the base when the present invention is in the breaking state.

Fig. 4 is a schematic diagram showing that the circuit breaker body can be pulled out from the base when the present invention is in the breaking state.

Fig. 5 is a schematic diagram of the assembly relationship between the latch and the bracket.

Fig. 6 is a schematic structural view of the bracket.

Fig. 7 is a structural schematic diagram of the connecting shaft.

Fig. 8 is a schematic structural diagram of the lock.

Fig. 9 is a schematic structural diagram of a limiting member.

Detailed ways

As shown in Figure 1, a plug-in molded case circuit breaker safety plug-in self-locking device of the present invention includes the following components:

A circuit breaker body 20 is provided with an operating mechanism 30 for operating the movable contacts and making the circuit breaker switch on or off. The operating mechanism 30 includes a connecting rod 9 rotatable around a rotating shaft 11 .

A base 10, the base 10 is provided with a limit step 102, the top surface 101 of the limit step is a slope, and the bottom surface 103 (see FIG. 2) of the limit step is parallel to the bottom surface of the base 10.

A limiter 2 is rotatably mounted on a fixed shaft 1 . The structure of the limiting member 2 is shown in FIG. 9 . It has a connecting arm 204 and a limiting arm 205 . The connecting arm 204 is provided with a waist-shaped hole 201 , and the end of the limiting arm 205 is provided with an arc surface 203 . Referring to Fig. 1, a linkage shaft 12 is pierced in the waist-shaped hole 201 of the connecting arm 204, and the linkage shaft 12 is connected with one end of the connecting rod 9, and the round hole 202 on the limiter 2 is used for piercing the fixed shaft 1 .

A bracket 4 is fixed on the bottom plate of the circuit breaker body 20 by two screws 3 . The structure of the bracket 4 is shown in FIG. 6 , and two screw holes 403 and 404 are provided on it for passing the screw 3 . A round hole 401 , a spring hook 402 and a stopper 405 are also provided on the bracket 4 .

A lock catch 5, the middle part of the lock catch 5 is rotatably installed on the bracket 4 through a connecting shaft 6, and the upper end of the lock catch 5 extends to the vicinity of the connecting rod 9 and the limit arm of the limiter 2, in this state , The limiting member 2 can prevent the rotation of the lock catch 5 . The structure of the buckle 5 is shown in Figure 8. Its upper end has a curved portion 508. The two ends of the curved portion 508 are respectively provided with arc surfaces 505 and 506. The lower end of the buckle is provided with a hook 502. The middle part of the buckle is respectively A boss 503 and a side arm 507 are extended to both sides, and a round hole 501 is provided on the side arm 507 , and a spring hook 504 is also provided on the latch 5 .

A spring 8 is connected between the buckle 5 and the bracket 4 .

Referring to FIGS. 5-8 in combination, when the buckle 5 is installed on the bracket 4 , the connecting shaft 6 passes through the circular holes 401 , 501 . The connecting shaft 6 is provided with a plurality of annular grooves 601 , and the retaining ring 7 is stuck in these annular grooves 601 for axially limiting the connecting shaft 6 . Obviously, this is not the only structural form. For example, those skilled in the art can easily imagine that the installation of the lock can also be realized by adding a retaining ring or a nut at the end of the stepped shaft. Two ends of the spring 8 are respectively connected to the spring hook 504 of the buckle 5 and the spring hook 402 of the bracket 4, so that the boss 503 on the buckle abuts against the block 405 of the bracket. Here spring 8 is an extension spring, but those skilled in the art can also easily replace extension spring 8 with a torsion spring, and the torsion spring is sleeved on the connecting shaft 6, and one end of the torsion spring is supported on the support 4, The other end abuts on the buckle 5, and the boss 503 on the buckle can also be made to abut against the block 405 of the bracket.

The working principle of the present invention will be described below.

Referring first to FIG. 1 , in the illustrated state, the circuit breaker body 20 is separated from the base 10 , and the operating mechanism is in the closed state. At this time, if the circuit breaker body 20 is to be inserted into the base 10, the hook 502 of the lock will touch the limit step 102 in the base, and the slope 101 will apply a counterclockwise torque to the lock 5, so that The lock catch 5 has a tendency to rotate counterclockwise around the connecting shaft 6, but since the boss 503 on the lock catch and the stopper 405 on the bracket interfere with each other, the lock catch 5 is prevented from rotating counterclockwise, so that the lock catch 5 is subjected to a limit step 102 can not be inserted into the base 10 to ensure the safety of the operator.

Referring again to FIG. 2 , in the illustrated state, the circuit breaker body 20 has been inserted into the base 10 , and the operating mechanism 30 is in the closed state. At this time, if the circuit breaker body 20 is to be pulled out from the base 10, the hook portion 502 of the lock catch will touch the bottom surface 103 of the limit step, and the bottom surface 103 will apply a clockwise torque to the lock catch, so that The lock buckle rotates clockwise around the connecting shaft 6, but as long as the lock buckle rotates a small angle, the arc surface 505 on the upper end of the lock buckle will touch the arc surface 203 on the limiter, and cannot continue to rotate clockwise, thus The hook portion 502 of the lock is blocked by the bottom surface 103 of the limiting step and cannot be pulled out from the base 10, ensuring the safety of the operator.

Referring to FIG. 3 , in the illustrated state, the circuit breaker body 20 is separated from the base 10 , and the operating mechanism is in a disconnected state. In the breaking state, the linkage shaft 12 connected with the connecting rod 9 slides to the lowermost end of the waist-shaped hole 201 of the limiter, and pushes the limiter 2 to rotate counterclockwise at a certain angle (relative to the closing state), so that the limiter The limit arm 205 is far away from the curved portion 508 at the upper end of the lock, so that the limit member 2 no longer hinders the rotation of the lock 5; on the other hand, the end surface of the connecting rod 9 is in contact with the arc surface 506 on the lock 5 , push the lock catch 5 to rotate clockwise by a certain angle (relative to the closed state). At this time, if the circuit breaker body 20 is to be inserted into the base 10, due to the change of the angle of the lock 5 itself, the hook 502 of the lock can just avoid the limit step 102, so the circuit breaker body 20 can be smoothly inserted into the base 10 in.

Referring to FIG. 4 , in the illustrated state, the circuit breaker body 20 has been inserted into the base 10 , and the operating mechanism is in the off state. Compared with the closed state of Fig. 1 and Fig. 2, in the disconnected state of Fig. 3 and Fig. 4, the limit arm 205 of the limit member is far away from the bending portion 508 at the upper end of the lock catch 5, so that the limit member 2 is no longer aligned. The rotation of the lock catch 5 is hindered, and the lock catch 5 rotates clockwise at a certain angle under the push of the connecting rod 9 , so that the hook 502 at the lower end of the lock catch just avoids the limit step 102 . At this time, if the circuit breaker body 20 is to be pulled out from the base 10 , the latch 5 will not be hindered, so that the circuit breaker body 20 can be pulled out from the base 10 smoothly.

In this way, through a very simple structure, the present invention can ensure that the plug-in molded case circuit breaker can only be plugged in and pulled out after the opening operation by adding a few parts in addition to the circuit breaker body and base , to ensure safe operation.

Claims (8)

1. A safe plug-in self-locking device for a plug-in molded case circuit breaker, characterized in that it includes the following components: The circuit breaker body (20), the circuit breaker body is provided with an operating mechanism (30), and the operating mechanism (30) includes a connecting rod (9) that can rotate around the rotating shaft (11); The base (10), the base is provided with a limit step (102), the top surface (101) of the limit step is a slope; The limiter (2) is rotatably installed on a fixed shaft (1), the limiter (2) has a connecting arm (204) and a limiter arm (205), and the connecting arm ( 204) is provided with a waist-shaped hole (201), and a linkage shaft (12) is passed through the waist-shaped hole (201) and connected with one end of the connecting rod (9); A bracket (4), fixed on the bottom of the circuit breaker body (20), and a stopper (405) is provided on the bracket (4); The lock (5), the middle part of the lock is rotatably installed on the bracket (4), the upper end of the lock (5) extends to the vicinity of the connecting rod (9) and the limit arm (205), the lock The lower end of the buckle (5) is provided with a hook (502) to cooperate with the limit step (102) of the base, and the lock (5) is also provided with a boss ( 503); The spring (8) is connected between the lock catch (5) and the bracket (4), so that the boss (503) on the lock buckle abuts against the stopper (405) of the bracket. 2. The safe plug-in self-locking device according to claim 1, characterized in that, the lock (5) is installed on the bracket (4) through a connecting shaft (6), and the connecting shaft ( 6) A plurality of annular grooves (601) are provided on the upper surface, and retaining rings (7) for axial positioning are installed in the annular grooves (601). 3. The safe plug-in self-locking device according to claim 1, characterized in that, the bracket (4) is fixed on the bottom plate of the circuit breaker body (20) by screws (3). 4. The safe plug-in self-locking device according to claim 1, characterized in that a spring hook (504, 402) is respectively provided on the lock (5) and the bracket (4), and the spring (8 ) is a tension spring, and the two ends of the tension spring are respectively connected to the spring hooks (504, 402). 5. The safety plug-in self-locking device according to claim 2, characterized in that, the lock (5) is provided with a side arm (507), and the side arm (507) is lifted from the boss (503) ) extends outward, and a round hole (501) is provided on the side arm (507) to cooperate with the connecting shaft (6). 6. The safe plug-in self-locking device according to claim 1, characterized in that the upper end of the lock (5) has a curved portion (508), and the two ends of the curved portion (508) are respectively provided with arcs Surface (505, 506). 7. The safe plug-in self-locking device according to claim 1, characterized in that, the end of the limiting arm (205) is provided with an arc surface (203). 8. The safe plug-in self-locking device according to claim 1, characterized in that, the bottom surface (103) of the limiting step is parallel to the bottom surface of the base (10). the

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