A safety drawer mechanism for an electric operating mechanism of a circuit breaker

Abstract

This utility model discloses a safety drawer mechanism for an electric operating mechanism of a circuit breaker, including an electric operating mechanism with a housing and a handle operating hole, and an electric opening and closing mechanism composed of a bracket, an electromagnetic drive mechanism, and an interlocking plate. The electromagnetic drive mechanism has a terminal on its electromagnet core, which is electrically connected to the output terminal of the circuit breaker; the interlocking plate slides with the bracket, with one end connected to the output terminal of the electromagnetic drive mechanism. This application can automatically lock and unlock the handle operating hole based on the energized / de-energized state of the unit drawer. When energized, the electromagnetic drive mechanism drives the interlocking plate to close the operating hole, preventing accidental tripping and power outages of the circuit breaker, ensuring stable system operation; when de-energized, the interlocking plate resets and opens the operating hole, facilitating maintenance and other operations. This design precisely meets safety requirements, improves operational safety, standardization, and mechanism reliability, and reduces the risk of equipment damage and production interruption.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker technology, specifically a safety drawer mechanism for an electric operating mechanism of a circuit breaker. Background Technology

[0002] In remote power control systems, the opening and closing operations of circuit breakers rely on their electric operating mechanisms, which are key components for achieving remote control and automated operation of the power system. In the application scenario of low-voltage switchgear unit drawers, the safe operation of the circuit breaker's electric operating mechanism must meet specific interlocking requirements: when the unit drawer is energized, it must be reliably locked to prevent circuit interruptions or equipment failures caused by misoperation; and when the unit drawer is de-energized, it should be unlockable to facilitate maintenance, repair, or adjustment operations.

[0003] In existing technologies, the rocker-type drawer mechanism of circuit breaker electric operating mechanisms often lacks an effective electric interlocking mechanism. When the unit drawer is energized, the operating hole for the handle used to drive the drawer forward or backward is unobstructed. If the rocker handle is mistakenly inserted into the operating hole and rotated counterclockwise, the drawer's positioning components (such as the top pin) will retract, triggering the micro switch at the connection position to disconnect. This results in an abnormal power cut-off of the circuit breaker's electric operating mechanism and unexpected tripping of the circuit breaker. Such abnormal power outages not only affect the stable operation of the power system but may also cause safety hazards such as production interruptions and equipment damage, failing to meet the stringent requirements for operational safety and reliability in industrial settings.

[0004] Therefore, there is an urgent need for an electric interlocking mechanism that can automatically lock and unlock the handle operating hole according to the power-on / power-off status of the unit drawer, so as to solve the safety hazards existing in the prior art and ensure the stable operation of the circuit breaker electric operating mechanism. Utility Model Content

[0005] In view of the shortcomings in the prior art, this utility model provides a safety drawer mechanism for the electric operating mechanism of a circuit breaker.

[0006] The technical solution adopted by this utility model is: a safety drawer mechanism for an electric operating mechanism of a circuit breaker, including an electric operating mechanism, the electric operating mechanism including a housing and a handle operating hole provided on the housing, and an electric opening and closing mechanism for opening or closing the handle operating hole, the electric opening and closing mechanism including a bracket, an electromagnetic drive mechanism and an interlocking plate.

[0007] The electromagnetic drive mechanism is electrically connected to the output terminal of the circuit breaker.

[0008] The interlocking plate slides with the bracket, and one end of the interlocking plate is connected to the output end of the electromagnetic drive mechanism.

[0009] Furthermore, the electromagnetic drive mechanism includes a coil frame, an electromagnet core, a return spring, and a magnet coil. The coil frame is fixedly connected to the outer shell. One end of the electromagnet core extends out of the coil frame as an output end and is connected to the interlocking plate, while the other end is a terminal block connected to the magnet coil.

[0010] Furthermore, the interlocking plate includes an integrally formed connecting plate, an upper plate, and a side plate. The output end has an external thread. The connecting plate is provided with a connecting hole for connecting to the output end. After the connecting plate is fitted onto the output end, it is fixed by a nut. One end of the side plate has an opening and closing section for opening or closing the handle operation hole.

[0011] Furthermore, the upper plate and the side plate are respectively fitted and slidably engaged with the upper surface and the side surface of the bracket. The side plate is provided with a guide groove, and a guide screw is fixed on the side surface of the bracket. The guide screw passes through the guide groove and is slidably engaged with the guide groove.

[0012] Furthermore, the electric operating mechanism includes a cam that rotates with the housing, a small gear fixedly connected to a connecting shaft at one end of the cam, a large gear that drives the small gear, a square shaft fixedly connected to the large gear, and an indicator plate fixedly connected to the square shaft. The indicator plate is provided with indicator markings, which include test, connection, and separation.

[0013] Furthermore, the electric operating mechanism also includes a positioning plastic part, an upper top pin, a lower top pin, a "V"-shaped spring, a test position micro switch and a connection position micro switch. The positioning plastic part is provided with a connecting post, and the large gear is provided with a connecting hole for connecting with the connecting post.

[0014] The beneficial effects of this utility model are:

[0015] 1. Eliminate the risk of abnormal power outages and ensure stable system operation: This application realizes the automatic opening or closing of the handle operation hole through an electric opening and closing mechanism. When the unit drawer is powered on, the wiring terminals of the electromagnetic drive mechanism (electrically connected to the circuit breaker output terminal) are energized, driving the interlocking plate to slide and block the handle operation hole, thereby closing the handle operation hole and preventing the crank handle from being inserted into the operation hole for operation. This avoids abnormal circuit breaker tripping and power outage caused by the action of the drawer positioning component or the disconnection of the connection position micro switch due to misoperation, ensuring that the power system operates under normal working conditions and meets the requirements of power supply stability.

[0016] 2. Achieve precise interlocking control and meet safety standards: The interlocking state of this mechanism is linked to the energized / de-energized state of the unit drawer. When energized, the electromagnetic drive mechanism drives the interlocking plate to close the handle operating hole, locking the drawer. When de-energized, the electromagnetic drive mechanism loses power, the interlocking plate resets, and the handle operating hole opens, unlocking the drawer. This design precisely meets the safety requirements of the low-voltage switchgear unit drawer circuit breaker electric operating mechanism for "energized locking and de-energized unlocking." Through the coordinated control of mechanical and electrical components, it improves the safety and standardization of operation, enhances the reliability of the circuit breaker electric operating mechanism in the rocker-type drawer mechanism, and reduces the risk of equipment damage or production interruption due to misoperation.

[0017] In addition to the objectives, features, and advantages described above, this utility model has other objectives, features, and advantages. The utility model will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model.

[0019] Figure 2 This is a schematic diagram of the electric opening and closing mechanism.

[0020] Figure 3 This is a cross-sectional schematic diagram of the electric opening and closing mechanism.

[0021] Figure 4 This is a schematic diagram of the electric operating mechanism.

[0022] Figure 5 This is an exploded schematic diagram of the electric operating mechanism.

[0023] Figure 6 This is a schematic diagram of the interlocking plate.

[0024] Figure 7 This is a schematic diagram of the structure of the large gear and the square shaft. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) in the embodiments of the present utility model, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a certain specific posture (as shown in the attached drawings). If the specific posture changes, the directional indications will also change accordingly.

[0027] The present utility model provides a safe drawer mechanism for a circuit breaker electric operating mechanism.

[0028] In this embodiment, referring to Figure 1-7 , this safe drawer mechanism of the circuit breaker electric operating mechanism includes an electric operating mechanism. The electric operating mechanism includes a housing 1 and a handle operation hole 2 provided on the housing 1, and further includes an electric opening and closing mechanism for opening or closing the handle operation hole. The electric opening and closing mechanism includes a bracket 3, an electromagnetic driving mechanism 5 and an interlocking piece 6;

[0029] The electromagnetic driving mechanism is electrically connected to the outgoing line end of the circuit breaker;

[0030] The interlocking piece is slidably配合 with the bracket, and one end of the interlocking piece is connected to the output end of the electromagnetic driving mechanism.

[0031] [[ID=1,7]]In the above technical solution, by adding an electric opening and closing mechanism composed of a bracket, an electromagnetic driving mechanism and an interlocking piece, automatic switching control of the handle operation hole is achieved. Among them, the electromagnetic driving mechanism is electrically connected to the outgoing line end of the circuit breaker, which can real-time feedback the power-on state of the unit drawer and provide the required power for the electromagnetic driving mechanism; the interlocking piece is slidably配合 with the bracket, and its movement is directly driven by the output end of the electromagnetic driving mechanism. When the drawer is powered on, the electromagnetic driving mechanism is powered on and drives the interlocking piece to slide to cover the handle operation hole, thereby closing the handle operation hole; when the drawer is powered off, the electromagnetic driving mechanism loses power, and the interlocking piece resets to open the handle operation hole.

[0032] Thus, the interlocking control between the handle operation hole and the power-on state of the drawer is achieved: automatically locked (blocking the operation hole) when powered on, and automatically unlocked (exposing the operation hole) when powered off, preventing misoperation in the powered-on state from a physical level. It avoids the problem of abnormal power-off caused by the unobstructed handle operation hole in the prior art, ensures the stable operation of the circuit breaker electric operating mechanism, and meets the core requirements of the power system for operation safety.

[0033] Specifically, the electromagnetic driving mechanism includes a coil frame 8, an electromagnet core 9, a return spring 10 and a magnet coil 11. The coil frame is fixedly connected to the housing. One end of the electromagnet core extends out of the coil frame as an output end 12 to be connected to the interlocking piece, and the other end is a wiring terminal 7 connected to the magnet coil. ​In this embodiment, the electromagnetic drive mechanism is a general structure. For example, power output is achieved through the synergistic action of a coil frame, an electromagnet core, a return spring, and a magnet coil: the coil frame is fixed to the outer shell; when the magnet coil is energized, it generates a magnetic field, driving the electromagnet core to move axially (acting as the output end to push the interlocking plate); when the power is off, the return spring drives the electromagnet core to reset, pulling the interlocking plate back to its initial position. The wiring terminal is integrated at the other end of the electromagnet core, directly related to the energization state of the circuit breaker's output terminal.

[0035] The return spring is used to retract and reset the electromagnet core after power is cut off.

[0036] Specifically, the interlocking plate includes an integrally formed connecting plate 13, an upper plate 14, and a side plate 15. The output end has an external thread. The connecting plate is provided with a connecting hole 16 for connecting to the output end. After the connecting plate is fitted onto the output end, it is fixed by a nut 17. One end of the side plate has an opening / closing section 18 for opening or closing the handle operation hole.

[0037] In this embodiment, the connecting plate is fixed to the external thread of the output end of the electromagnetic drive mechanism by a nut to ensure that the power transmission is not loose; the opening and closing section of the side plate directly acts on the handle operation hole, and the operation hole is blocked or exposed by sliding; the cooperative structure of the upper plate and the side plate ensures the guidance during the sliding process.

[0038] In addition, the interlocking plate adopts an integral molding structure, which can reduce component assembly errors, improve the structural strength and motion stability of the interlocking plate, and avoid interlocking failure caused by loose components.

[0039] The connecting plate is fixed to the output end with a nut, and the position of the interlocking plate can be adjusted according to actual needs to ensure precise matching of the obstruction / exposure size of the operating hole.

[0040] Specifically, the upper plate and the side plate are respectively fitted and slidably engaged with the upper surface and the side surface of the bracket. The side plate is provided with a guide groove 19, and the side surface of the bracket is provided with a guide screw 20, which passes through the guide groove 19 and is slidably engaged with the guide groove 19.

[0041] In this embodiment, the upper plate and the side plate are respectively attached to the upper surface and the side surface of the bracket to form a bidirectional sliding guide; the guide groove of the side plate cooperates with the guide screw on the bracket to restrict the sliding trajectory of the interlocking piece, ensuring that it only moves in a preset direction and avoiding deviation or jamming.

[0042] The multi-guide structure (fitting sliding + guide screw and long groove cooperation) strictly constrains the movement path of the interlocking plate, eliminates the risk of skewing or jamming during the sliding process, and improves the reliability of the mechanism.

[0043] Specifically, the electric operating mechanism includes a cam 21 that rotates with the housing, a small gear 23 fixedly connected to a connecting shaft 22 at one end of the cam 21, a large gear 24 that drives the small gear 23, a square shaft 25 fixedly connected to the large gear, and an indicator plate 26 fixedly connected to the square shaft 25. The indicator plate 26 is provided with indicator markings 27, which include test, connection, and separation.

[0044] In this embodiment, the electric operating mechanism converts the rotational motion of the crank handle into an angular change of the indicator plate through a transmission chain of cam, pinion, gear and square shaft: the crank handle drives the cam to rotate, and after transmission through the pinion and gear, it drives the square shaft and the fixed indicator plate to rotate, and the working position of the drawer is displayed in real time through the "Test", "Connect" and "Separate" markings.

[0045] The clear distinction of indicator labels (test / connection / separation) meets the need for visualization of the working status of the low-voltage switchgear unit drawers, improving the ease of operation and system maintenance efficiency.

[0046] Specifically, the electric operating mechanism also includes a positioning plastic part 29, an upper top pin 30, a lower top pin 31, a "V"-shaped spring, a test position micro switch 32, and a connection position micro switch 33. The positioning plastic part is provided with a connecting post 34, and the large gear is provided with a connecting hole 35 that connects to the connecting post 34.

[0047] In this embodiment, the positioning plastic part engages with the connecting hole of the large gear via a connecting post, rotating synchronously with the large gear. A "V"-shaped spring engages with the slot 36 on the positioning plastic part. The upper and lower top pins are used to trigger the micro switch in the test position or the micro switch in the connection position. When the drawer is in the test position, the lower top pin activates the test switch; when in the connection position, the upper top pin activates the connection switch, achieving electrical feedback of the position signal. The electric operating mechanism is an existing structure and will not be described in detail here.

[0048] Attention all technical personnel: Although this utility model has been described according to the specific embodiments above, the concept of this utility model is not limited to this utility model. Any modification that utilizes the concept of this utility model will be included within the scope of protection of this patent right.

Claims

1. A safety drawer mechanism for a circuit breaker motor operator mechanism, comprising a motor operator mechanism including a housing and a handle operating aperture provided on the housing, characterized by: It also includes an electric opening and closing mechanism for opening or closing the handle operation hole, the electric opening and closing mechanism comprising a bracket, an electromagnetic drive mechanism and an interlocking plate; The electromagnetic drive mechanism is electrically connected to the output terminal of the circuit breaker. The interlocking plate slides with the bracket, and one end of the interlocking plate is connected to the output end of the electromagnetic drive mechanism.

2. A safety drawer mechanism for an electrically operated circuit breaker mechanism according to claim 1, characterized in that: The electromagnetic drive mechanism includes a coil frame, an electromagnet core, a return spring, and a magnet coil. The coil frame is fixed to the outer shell. One end of the electromagnet core extends out of the coil frame as an output end and is connected to the interlocking plate. The other end is a terminal block connected to the magnet coil.

3. A safety drawer mechanism for a circuit breaker motor operated mechanism according to claim 1 or 2, characterized in that: The interlocking plate includes an integrally formed connecting plate, an upper plate, and a side plate. The output end has an external thread. The connecting plate is provided with a connecting hole for connecting to the output end. After the connecting plate is fitted onto the output end, it is fixed by a nut. One end of the side plate has an opening and closing section for opening or closing the handle operation hole.

4. The safety drawer mechanism of the circuit breaker electric operating mechanism according to claim 3, characterized in that: The upper plate and the side plate are respectively fitted and slidably engaged with the upper surface and the side surface of the bracket. The side plate is provided with a guide groove, and the side surface of the bracket is provided with a guide screw that passes through the guide groove and is slidably engaged with the guide groove.

5. The safety drawer mechanism of the circuit breaker electric operating mechanism according to claim 1, characterized in that: The electric operating mechanism includes a cam that rotates with the housing, a small gear fixed to a connecting shaft at one end of the cam, a large gear that drives the small gear, a square shaft fixed to the large gear, and an indicator plate fixed to the square shaft. The indicator plate is provided with indicator markings, which include test, connection, and separation.

6. The safety drawer mechanism of the circuit breaker electric operating mechanism according to claim 5, characterized in that: The electric operating mechanism also includes a positioning plastic part, an upper top pin, a lower top pin, a "V"-shaped spring, a test position micro switch and a connection position micro switch. The positioning plastic part is provided with a connecting post, and the large gear is provided with a connecting hole for connecting with the connecting post.

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