Operation locking mechanism of molded case circuit breaker

Abstract

The utility model discloses an operation locking mechanism of a molded case circuit breaker, which comprises a shell and an electric operation mechanism arranged in the shell. The electric operating mechanism comprises a moving contact action assembly with a driving lever, a sliding block which is arranged on the shell in a sliding manner and can drive the driving lever to shift, an operating shaft which can drive the sliding block to slide and is provided with an operating hole site, and a motor speed reducing assembly which can drive the operating shaft to rotate, and a cover plate which can shield the operating hole site is arranged on the shell in a sliding manner; the shell is also provided with a rotating lock and a tripping button positioned on one side of the rotating lock, and is characterized in that the shell is provided with a manual microswitch positioned on one side of the cover plate, and the shell is provided with a locking microswitch positioned on one side of the rotating lock. By arranging the locking microswitch and the manual microswitch, signal transmission of a manual operation state and a rotating lock locking state can be achieved, limiting of other components can be achieved through rotating locking of the rotating lock, misoperation is prevented, and operation safety is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of low-voltage electrical appliances, and more particularly to an operation locking mechanism for a molded case circuit breaker. Background Art

[0002] Existing molded case circuit breakers with energy storage electric operating mechanisms typically have free tripping, re-tripping, and closing states. These mechanisms typically operate in two modes: manual and automatic, and these modes can be switched between to operate the associated circuit breaker. Energy storage involves storing electrical energy in a compressed spring via a motor and a reduction mechanism. When needed, this stored energy is instantly released to push the circuit breaker handle, closing the molded case circuit breaker. In the manual mode, operating the manual operating mechanism causes the energy storage mechanism to store energy, completing the re-tripping operation of the associated circuit breaker and preparing for the next closing step. In the automatic mode, an electrical signal is sent to the electric operator, and the motor, through multi-stage transmission gears, stores energy in the energy storage mechanism, simultaneously completing the re-tripping operation of the associated circuit breaker and preparing for the next closing step. The manual state is suitable for local operation, and is used when the operator needs to close or open the circuit breaker on site. The automatic state is suitable for remote operation, and the operator operates the electric operating mechanism remotely through communication control to achieve closing and opening operations of the circuit breaker.

[0003] Among them, during the manual and automatic operation of the electric operating mechanism, it is necessary to clearly distinguish between manual operation and automatic operation to prevent confusion between manual and automatic operations, and a corresponding locking mechanism needs to be set to limit the corresponding operation to prevent safety hazards caused by misoperation of the molded case circuit breaker. Utility Model Content

[0004] The utility model overcomes the shortcomings of the prior art and has a reasonable structural design. By arranging a locking micro switch and a manual micro switch, signal transmission of a manual operation state and a rotary lock locking state can be realized. Moreover, the rotary locking of the rotary lock can limit other components, thereby preventing misoperation and improving operational safety.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] An operation locking mechanism for a molded case circuit breaker comprises a housing and an electric operating mechanism arranged in the housing, the electric operating mechanism comprising a moving contact action assembly having a toggle lever, a sliding block slidably arranged on the housing and capable of driving the toggle lever to toggle, an operating shaft capable of driving the sliding block to slide and having an operating hole, and a motor reduction assembly capable of driving the operating shaft to rotate, a cover plate slidably arranged on the housing to block the operating hole, a rotary lock and a trip button located on one side of the rotary lock are also arranged on the housing, a manual micro switch is arranged on one side of the housing on the cover plate, and a trip button is arranged on one side of the housing on the rotary lock. A locking microswitch is provided, and a contact block that can interfere with the locking microswitch, a limit block that can limit the downward pressure of the trip button, and a limit block that can limit the sliding of the cover plate are arranged circumferentially of the rotary lock. When the rotary lock is rotated clockwise from the unlocked state to the locked state, the contact block interferes with the locking microswitch and the limit block limits the downward pressure of the trip button. When the sliding cover plate exposes the operating hole, the manual microswitch is interfered with by the cover plate. The operating shaft is linked to the toggle shaft block, and the sliding block is provided with a matching groove corresponding to the toggle shaft block. The rotation of the operating shaft drives the toggle shaft block to toggle in the matching groove, thereby driving the sliding block to slide.

[0007] By adopting the above technical solution, the electric operating mechanism can be remotely operated during operation. Specifically, the circuit board controls the operation of the motor reduction assembly, thereby driving the operating shaft to rotate. The operating shaft drives the toggle shaft to toggle in the mating groove, thereby driving the sliding block to slide. The sliding block slides and drives the toggle lever to toggle, thereby operating the moving contact actuating assembly. The electric operating mechanism has free tripping, re-engaging, and closing states. The sliding block slides to drive the electric operating mechanism to re-engage and close. Pressing the trip button switches the electric operating mechanism to the tripped state. When manual operation is required, the cover plate slides to expose the operating hole, and a dedicated tool is inserted into the operating hole to rotate the operating shaft. Due to the provision of a manual microswitch, the manual microswitch is actuated only when the slide plate slides to expose the operating hole, thereby outputting a manual operation signal to the circuit board. By providing a rotation lock and a locking microswitch, the abutment block abuts the locking microswitch only when the rotation lock is rotated clockwise from the unlocked state to the locked state. At this time, the locking microswitch transmits a rotation lock lock signal to the circuit board. Among them, when the rotary lock is in the locked state, the limit block can limit the depression of the trip button, thereby playing a safety protection role.

[0008] Preferably, a limit block is provided on the cover plate, the limit block is arranged to correspond to the height of the limit block, and both sides of the limit block can limit the limit block.

[0009] By adopting the above technical solution, it is configured so that no matter whether the cover slides to block or expose the operating hole, as long as the rotary lock is in the locked state, the limit block will be blocked by the side of the limit block, restricting the cover from sliding.

[0010] Preferably, the trip button is provided with a blocking block which can abut against the limiting block, and the blocking block is higher than the limiting block in the height direction.

[0011] By adopting the above technical solution, the limiting block cooperates with the blocking block, and the limiting block is set lower than the blocking block. When the rotary lock is in the locked state, the limiting block is located directly below the blocking block. At this time, the blocking block on the trip button is limited by the limiting block, and the trip button cannot be pressed down to perform the tripping operation.

[0012] Preferably, the interference block and the locking micro switch are at the same height, and the limiting block is located below the interference block and the limiting block.

[0013] By adopting the above technical solution, the interference block is configured to cooperate with the locking micro switch, and the limiting block is configured to be located below the interference block and the limit block. In this way, the limiting block, the interference block and the limit block are reasonably arranged at the height of the side of the rotary lock to avoid interference, and can cooperate with corresponding components to play a corresponding limiting role.

[0014] Preferably, a limiting side surface is provided on the side of the sliding block close to the rotary lock, and a receiving groove is provided on the middle part of the sliding block located at the limiting side surface. A side protrusion that can be located in the receiving groove is provided on the rotary lock. The limiting side surface blocks the side protrusion to limit the rotation of the rotary lock. The receiving groove is opposite to the side protrusion only when the electric operating mechanism is in the re-locking state, and at this time the side protrusion is located in the receiving groove.

[0015] The main purpose of adopting the above technical solution is to ensure that the rotary lock can only be locked in the re-engaged state. Specifically, when the electric operating mechanism is in the re-engaged state, the side protrusion will be located in the accommodating groove. Since the accommodating groove provides rotational space for the side protrusion, the rotary lock can be rotated at this time. However, when the electric operating mechanism is in the free tripping or closing state, if the rotary lock is rotated from the unlocked state to the locked state, the side protrusion will be blocked by the limiting side, making the rotary lock unable to rotate. This can limit the use scenarios of the rotary lock and prevent the safety hazards caused by the accidental operation of the rotary lock. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram showing the structure of the housing in accordance with a specific embodiment of the present invention;

[0017] Figure 2 This is a schematic diagram showing the internal structure of the housing in accordance with a specific embodiment of the present invention;

[0018] Figure 3 This is a schematic diagram of the structure of the electric operating mechanism of the utility model. Figure 1 ;

[0019] Figure 4 Fig. 1 is a structural schematic diagram reflecting the electric operating mechanism of the embodiment of the present application Figure 2 ;

[0020] Figure 5 Fig. 1 is a structural schematic diagram reflecting the electric operating mechanism of the embodiment of the present application

[0021] Figure 6 Fig. 1 is a structural schematic diagram reflecting the electric operating mechanism of the embodiment of the present application

[0022] In the figure: 1, the shell; 11, the manual micro switch; 12, the locking micro switch; 2, the electric operating mechanism; 21, the movable contact action assembly; 22, the push rod; 23, the motor speed reduction assembly; 3, the sliding block; 31, the limiting side surface; 32, the accommodating groove; 33, the matching groove; 4, the operating shaft; 41, the operating hole position; 42, the push shaft block; 5, the cover plate; 51, the limiting block; 6, the rotating lock; 61, the abutting block; 62, the limiting block; 63, the limiting block; 64, the side protruding block; 7, the tripping button; 71, the blocking block. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0024] As Figure 1-6As shown, an operation locking mechanism of a molded case circuit breaker includes a housing 1 and an electric operating mechanism 2 arranged in the housing 1, the electric operating mechanism 2 includes a moving contact action component 21 with a toggle rod 22, a sliding block 3 slidably arranged on the housing 1 and capable of driving the toggle rod 22 to toggle, an operating shaft 4 capable of driving the sliding block 3 to slide and having an operating hole 41, and a motor reduction assembly 23 capable of driving the operating shaft 4 to rotate, a cover plate 5 slidably provided on the housing 1 to block the operating hole 41, a rotary lock 6 and a trip button 7 located on one side of the rotary lock 6 are further provided on the housing 1, a manual micro switch 11 is provided on one side of the cover plate 5 on the housing 1, and a lock is provided on one side of the rotary lock 6 on the housing 1. The microswitch 12 is fixed, and the circumferential direction of the rotary lock 6 is provided with a contact block 61 that can contact the locking microswitch 12, a limit block 62 that can limit the downward pressure of the trip button 7, and a limit block 63 that can limit the sliding of the cover plate 5. When the rotary lock 6 is rotated clockwise from the unlocked state to the locked state, the contact block 61 contacts the locking microswitch 12 and the limit block 63 limits the downward pressure of the trip button 7. When the sliding cover plate 5 exposes the operating hole 41, the manual microswitch 11 is contacted by the cover plate 5. The operating shaft 4 is linked to the toggle shaft block 42, and the sliding block 3 is provided with a matching groove 33 corresponding to the toggle shaft block 42. The rotation of the operating shaft 4 drives the toggle shaft block 42 to toggle in the matching groove 33, thereby driving the sliding block 3 to slide.

[0025] By adopting the above technical solution, during specific operation, the electric operating mechanism 2 can be remotely operated electrically, that is, the circuit board controls the operation of the motor reduction assembly 23, thereby driving the operating shaft 4 to rotate, and the operating shaft 4 drives the toggle shaft to toggle in the matching groove 33, thereby driving the sliding block 3 to slide, and the sliding block 3 slides and can drive the toggle rod 22 to toggle, thereby realizing the operation of the moving contact actuating assembly 21. The electric operating mechanism 2 has free tripping, re-tripping and closing states. The sliding block 3 slides to drive the electric operating mechanism 2 to re-trip and close, and pressing the trip button 7 switches the electric operating mechanism 2 to the tripped state. When manual operation is required, the sliding cover 5 is slid to expose the operating hole, and a special tool is inserted into the operating hole 41 to realize the rotation of the operating shaft 4. Since a manual micro switch 11 is provided, only when the slide slides to expose the operating hole is the manual micro switch 11 actuated, thereby outputting a manual operation signal to the circuit board. By providing the rotary lock 6 and the locking microswitch 12, the contact block 61 contacts the locking microswitch 12 only when the rotary lock 6 is rotated clockwise from the unlocked state to the locked state. At this time, the locking microswitch 12 transmits a locking signal to the circuit board to lock the rotary lock 6. Furthermore, when the rotary lock 6 is locked, the limit block 63 can restrict the downward pressure of the trip button 7, thereby providing a safety protection function.

[0026] In addition, a limit block 51 is provided on the cover 5, and the limit block 63 is set to a height corresponding to the limit block 51. Both sides of the limit block 63 can limit the limit block 51. In this way, no matter whether the cover 5 slides or not, thereby blocking or exposing the operation hole 41, as long as the rotary lock 6 is in a locked state, the limit block 51 will be blocked by the side of the limit block 63, thereby restricting the cover 5 from sliding.

[0027] The trip button 7 is provided with a blocking block 71 that can abut against the limiting block 62. The blocking block 71 is higher than the limiting block 62 in the height direction, wherein the limiting block 62 cooperates with the blocking block 71, and the limiting block 62 is set lower than the blocking block 71. When the rotary lock 6 is in the locked state, the limiting block 62 is located directly below the blocking block 71. At this time, the blocking block 71 on the trip button 7 is limited by the limiting block 62, and the trip button 7 cannot be pressed down to perform the tripping operation.

[0028] The contact block 61 is at the same height as the locking microswitch 12, and the limit block 62 is located below the contact block 61 and the limit block 63. In this arrangement, the contact block 61 cooperates with the locking microswitch 12, and the limit block 62 is set to be located below the contact block 61 and the limit block 63. In this way, the limit block 62, the contact block 61 and the limit block 63 are reasonably arranged at the height of the side of the rotary lock 6 to avoid interference, and can cooperate with corresponding components to play a corresponding limiting role.

[0029] In addition, a limiting side surface 31 is provided on the side of the sliding block 3 near the rotary lock 6. A receiving groove 32 is provided in the middle of the limiting side surface 31 of the sliding block 3. A side protrusion 64 is provided on the rotary lock 6, which can be located in the receiving groove 32. The limiting side surface 31 blocks the side protrusion 64 to limit the rotation of the rotary lock 6. The receiving groove 32 is opposite to the side protrusion 64 only when the electric operating mechanism 2 is in the re-engaged state, at which time the side protrusion 64 is located in the receiving groove 32. The main purpose of this arrangement is to ensure that the rotary lock 6 can only be locked in the re-engaged state. Specifically, when the electric operating mechanism 2 is in the re-engaged state, the side protrusion 64 will be located in the receiving groove 32. Since the receiving groove 32 provides rotation space for the side protrusion 64, the rotary lock 6 can be rotated at this time. When the electric operating mechanism 2 is in a free tripping or closing state, if the rotary lock 6 is to be rotated from the unlocked state to the locked state, the side protrusion 64 will be blocked and limited by the limiting side 31, so that the rotary lock 6 cannot be rotated. This can limit the usage scenarios of the rotary lock 6 and prevent the rotary lock 6 from being misoperated and causing safety hazards.

[0030] The above merely describes a preferred embodiment of the present application, and the protection scope of the present application is not limited thereto, and any skilled person in the art, according to the technical scheme and the inventive concept of the present application, makes equivalent replacement or change within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. An operation locking mechanism for a molded case circuit breaker, comprising a housing (1) and an electric operating mechanism (2) arranged in the housing (1), the electric operating mechanism (2) comprising a moving contact action assembly (21) having a shifting rod (22), a sliding block (3) slidably arranged on the housing (1) and capable of driving the shifting rod (22) to shift, an operating shaft (4) capable of driving the sliding block (3) to slide and having an operating hole (41), and a motor reduction assembly (23) capable of driving the operating shaft (4) to rotate, a cover plate (5) slidably arranged on the housing (1) for blocking the operating hole (41), and a rotary lock (6) and a trip button (7) located on one side of the rotary lock (6), characterized in that: A manual micro switch (11) is provided on one side of the cover plate (5) on the housing (1), a locking micro switch (12) is provided on one side of the rotary lock (6) on the housing (1), and a resisting block (61) that can resist the locking micro switch (12), a limiting block (62) that can limit the downward pressure of the trip button (7), and a limiting block (63) that can limit the sliding of the cover plate (5) are provided circumferentially of the rotary lock (6). When the rotary lock (6) is rotated clockwise from the unlocked state to the locked state, the resisting block (61) resists the locking micro switch (12) and the limiting block (63) limits the downward pressure of the trip button (7). When the sliding cover plate (5) exposes the operation hole (41), the manual micro switch (11) is resisted by the cover plate (5).

2. The operation locking mechanism of a molded case circuit breaker according to claim 1, characterized in that: A limit block (51) is provided on the cover plate (5), and the limit block (63) is provided at a height corresponding to that of the limit block (51), and both sides of the limit block (63) can limit the limit block (51).

3. The operation locking mechanism of a molded case circuit breaker according to claim 2, characterized in that: The trip button (7) is provided with a blocking block (71) that can abut against the limiting block (62), and the blocking block (71) is higher than the limiting block (62) in the height direction.

4. The operation locking mechanism of a molded case circuit breaker according to claim 3, characterized in that: The resisting block (61) and the locking micro switch (12) are at the same height, and the limiting block (62) is located below the resisting block (61) and the limiting block (63).

5. An operation locking mechanism for a molded case circuit breaker according to claim 1, 2, 3 or 4, characterized in that: A limiting side surface (31) is provided on a side of the sliding block (3) close to the rotary lock (6); a receiving groove (32) is provided on the sliding block (3) in the middle of the limiting side surface (31); a side protrusion (64) which can be located in the receiving groove (32) is provided on the rotary lock (6); the limiting side surface (31) blocks the side protrusion (64) to limit the rotation of the rotary lock (6); the receiving groove (32) is opposite to the side protrusion (64) only when the electric operating mechanism (2) is in a re-engaged state, at which time the side protrusion (64) is located in the receiving groove (32).

6. The operation locking mechanism of a molded case circuit breaker according to claim 5, characterized in that: The operating shaft (4) is linked to a toggle shaft block (42), and a matching groove (33) corresponding to the toggle shaft block (42) is provided on the sliding block (3). The operating shaft (4) rotates to drive the toggle shaft block (42) to toggle in the matching groove (33), thereby driving the sliding block (3) to slide.

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