A pull cord operating mechanism for a circuit breaker

Abstract

The utility model discloses a kind of pull wire operating mechanisms for circuit breaker, including pivot, be installed on the pivot and the elastic reset piece of warped plate, pivot is installed on the shell outside of circuit breaker, the middle part of warped plate is connected with pivot, both ends of warped plate are respectively equipped with top rod and flexible rope, the top rod is inserted into shell and is opposite with opening or closing switch, the flexible rope extends to the cabinet door of explosion-proof box.When pulling flexible rope, top rod presses and opens opening or closing switch, while elastic reset piece is compressed energy storage;The top rod is separated from opening or closing switch under the elastic force of elastic reset piece.The utility model utilizes lever principle to convert the pulling movement of flexible rope into the pressing movement of top rod, while the deformable characteristics of flexible rope enable it to extend to any position of explosion-proof box cabinet door, so that different explosion-proof box is not needed according to different circuit breaker model selection, improve the matching of circuit breaker and explosion-proof box, remove the limitation of button distribution on explosion-proof box.

Description

Technical Field

[0001] This utility model relates to the field of explosion-proof circuit breaker technology, and in particular to a pull-wire operating mechanism for a circuit breaker. Background Technology

[0002] The circuit breaker closing and opening mechanism is a control mechanism used to operate the circuit breaker to close and open from the outside. Ordinary household circuit breakers are controlled by a knife switch, while industrial circuit breakers are mostly controlled manually or electrically by a linkage mechanism set outside the circuit breaker housing. Explosion-proof circuit breakers, such as mining circuit breakers, need to be placed in an explosion-proof box. The explosion-proof box is normally closed, and the closing and opening are controlled by buttons on the surface of the explosion-proof box.

[0003] In existing technologies, the control switch positions of the circuit breaker's closing and opening mechanisms are fixed on the surface of the circuit breaker. Therefore, the button positions on the explosion-proof box are also fixed. For circuit breakers with different internal wiring structures, the positions of their control switches are also different, requiring the purchase of different models of explosion-proof boxes. This results in poor compatibility between the circuit breaker and the explosion-proof box, and places great limitations on the button distribution on the explosion-proof box.

[0004] In addition, the existing closing and opening mechanisms controlled from outside the circuit breaker housing are relatively complex, occupy a large space, and are prone to transmission abnormalities, requiring frequent maintenance. Utility Model Content

[0005] To address the technical problem that the control switch positions of the circuit breaker's closing and opening mechanisms are fixed on the surface of the circuit breaker, resulting in poor compatibility between the circuit breaker and the explosion-proof box, and significant limitations on the button distribution on the explosion-proof box, this utility model provides a pull-wire operating mechanism for circuit breakers to solve the above problems.

[0006] The technical solution adopted by this utility model to solve its technical problem is: a pull-wire operating mechanism for a circuit breaker, including a rotating shaft, a rocker plate installed on the rotating shaft, and an elastic reset component. The rotating shaft is installed outside the housing of the circuit breaker. The middle part of the rocker plate is connected to the rotating shaft. The two ends of the rocker plate are respectively provided with a top rod and a flexible rope. The top rod extends into the housing and is directly opposite the opening or closing switch. The flexible rope extends to the cabinet door of the explosion-proof box.

[0007] When the flexible rope is pulled, the top rod presses against the opening or closing switch, and at the same time the elastic reset member is compressed and stores energy; the top rod separates from the opening or closing switch under the elastic force of the elastic reset member.

[0008] In an optional embodiment of this utility model, a limiting rod is fixed on the rotating shaft, and the elastic reset member is a torsion spring, with one end of the torsion spring fixed and the other end hooked on the limiting rod.

[0009] In an optional embodiment of this utility model, a mounting bracket is also included. The mounting bracket includes a base plate and side plates located on both sides of the base plate. The rotating shaft is rotatably connected to the two side plates. A crossbar is provided on the mounting bracket, and the fixed end of the torsion spring presses on the crossbar.

[0010] In an optional embodiment of this utility model, a stop block is provided on the side plate, and when the elastic reset member is reset, the outer side of the rocker plate abuts against the stop block.

[0011] In an optional embodiment of this utility model, the rocker is L-shaped, and the height of the end of the rocker connected to the flexible rope is higher than the height of the end connected to the top rod.

[0012] In an optional embodiment of this utility model, the outer side of the rocker is provided with a concave arc-shaped groove, and when the elastic reset member is reset, the stop block abuts against the arc-shaped groove.

[0013] In an optional embodiment of this utility model, when the outer side of the rocker plate abuts against the stop block, the two ends of the rocker plate are located on both sides of a vertical plane passing through the center of rotation of the rocker plate, and the inclination angle between the end of the rocker plate connected to the flexible rope and the vertical plane is smaller than the inclination angle between the end of the rocker plate connected to the top rod and the vertical plane.

[0014] In an optional embodiment of this utility model, a guide plate fixed to the outside of the circuit breaker housing is also included. The guide plate is provided with a lead wire groove, and the flexible rope extends to the cabinet door of the explosion-proof box after passing through the lead wire groove.

[0015] In an optional embodiment of this utility model, the surface of the guide plate is parallel to the central axis of the rotating shaft, and the guide plate is arranged on the side close to the top rod.

[0016] In an optional embodiment of this utility model, the rocker is two parallel L-shaped plates, and the top rod is located between the two L-shaped plates and is rotatably connected by a pin.

[0017] The beneficial effects of this utility model are:

[0018] (1) This utility model utilizes the lever principle to transform the pulling motion of the flexible rope into the pressing motion of the top rod. At the same time, the deformable characteristics of the flexible rope allow it to extend to any position of the explosion-proof box door, thus eliminating the need to select different explosion-proof boxes according to different circuit breaker models, improving the matching between circuit breakers and explosion-proof boxes, and removing the limitations of button distribution on explosion-proof boxes.

[0019] (2) The present invention uses the L-shaped design of the rocker to enable the rocker to drive the top rod to complete the up and down movement, while the movement of the top rod will not interfere with the flexible rope.

[0020] (3) The present invention uses an arc groove design on the outside of the rocker to make the baffle stably hold the rocker, and at the same time can avoid accidental activation of the mechanism due to accidental contact with the flexible rope.

[0021] (4) The present invention is provided with a guide plate for guiding the flexible rope. No matter where the flexible rope extends to in the explosion-proof box, the flexible rope can be pulled along the line connecting the rocker plate and the guide groove. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] Figure 1 This is a schematic diagram showing the usage state of the pull-wire operating mechanism for the circuit breaker described in this utility model;

[0024] Figure 2 This is a schematic diagram of the installation of the pull-wire operating mechanism for the circuit breaker described in this utility model on the housing;

[0025] Figure 3 yes Figure 2 Enlarged view of point a in the middle.

[0026] In the diagram, 1. Rotating shaft, 2. Rocker, 201. Pulling section, 202. Top pressure section, 3. Elastic reset component, 4. Explosion-proof box, 5. Limiting rod, 6. Housing, 7. Top rod, 8. Flexible rope, 9. Mounting bracket, 901. Base plate, 902. Side plate, 10. Crossbar, 11. Pin, 12. Stop block, 13. Arc groove, 14. Vertical surface, 15. Guide plate, 16. Lead wire groove. Detailed Implementation

[0027] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0028] Example 1

[0029] A pull-wire operating mechanism for a circuit breaker includes a rotating shaft 1, a rocker plate 2 mounted on the rotating shaft 1, and an elastic reset member 3. The rotating shaft 1 serves as the rotation center of the rocker plate 2, and the rocker plate 2 rotates synchronously with the rotating shaft 1. Specifically, this can be achieved through an interference fit between the two or a non-circular shaft hole fit. The elastic reset member 3 plays the role of automatically resetting by utilizing elastic force.

[0030] like Figures 1-3As shown, the rotating shaft 1 is installed outside the circuit breaker housing 6. The middle part of the rocker arm 2 is connected to the rotating shaft 1. The two ends of the rocker arm 2 are respectively provided with a push rod 7 and a flexible rope 8. The push rod 7 extends into the housing 6 and is directly opposite the opening or closing switch. The flexible rope 8 extends to the cabinet door of the explosion-proof box 4. The flexible rope 8 can be a metal steel wire or a deformable thin rope such as nylon rope.

[0031] Traditional structures use a push rod 7 to directly press the opening or closing switch inside the housing 6. The switch button on the explosion-proof box 4 must be directly opposite the push rod 7, resulting in poor adaptability of the explosion-proof box 4. This utility model uses the rocker plate 2 for connection and utilizes the variability of the flexible rope 8 to allow the flexible rope 8 to extend to any position of the explosion-proof box 4, thereby enabling the same explosion-proof box 4 to be adapted to various different types of circuit breakers.

[0032] When the flexible rope 8 is pulled, the push rod 7 presses against the opening or closing switch, and at the same time, the elastic reset member 3 is compressed and stores energy; the push rod 7 separates from the opening or closing switch under the elastic force of the elastic reset member 3. The action of pulling the flexible rope 8 is completed from the cabinet door of the explosion-proof box 4. The traction rope can be pulled to the outside of the cabinet door of the explosion-proof box 4 and the flexible rope 8 can be pulled directly. Alternatively, a button can be installed on the cabinet door of the explosion-proof box 4. When the button is pressed, the flexible rope 8 can be pulled.

[0033] In an optional embodiment of this utility model, a limiting rod 5 is fixed on the rotating shaft 1, and the elastic reset member 3 is a torsion spring, with one end of the torsion spring fixed and the other end hooked onto the limiting rod 5. When the flexible rope 8 is pulled, the rocker 2 drives the rotating shaft 1 to rotate, and the rotating shaft 1 drives one end of the torsion spring to rotate through the limiting rod 5, causing the torsion spring to contract and store energy. When the flexible rope 8 is released, the torsion spring drives the limiting rod 5 to rotate in the opposite direction, thereby resetting the rocker 2.

[0034] The pull-wire operating mechanism of the circuit breaker described in this utility model is preferably arranged on the top of the housing 6. The top rod 7 presses down to close or open the switch. A bracket 9 can be fixedly installed on the top of the housing 6. The bracket 9 includes a base plate 901 and side plates 902 located on both sides of the base plate 901. The rotating shaft 1 is rotatably connected to the two side plates 902. A crossbar 10 is provided on the bracket 9. The fixed end of the torsion spring presses against the crossbar 10, and the torsion spring can also be fixed to the crossbar 10. The function of the crossbar 10 is to limit the fixed end of the torsion spring.

[0035] like Figure 3 As shown, rocker plate 2 consists of two parallel L-shaped plates. The push rod 7 is located between the two L-shaped plates and is rotatably connected by a pin 11. The rotatable connection between the push rod 7 and rocker plate 2 is to keep the push rod 7 vertically downward to press the closing switch or the opening switch. Clamping the push rod 7 between the two L-shaped plates can ensure that the force on both sides of the push rod 7 is uniform and prevent the rocker plate 2 from deforming.

[0036] Example 2

[0037] Based on Embodiment 1, a stop block 12 is provided on the side plate 902. When the elastic reset member 3 is reset, the outer side of the rocker 2 abuts against the stop block 12. In Embodiment 1, the rocker 2 can only stop moving after the torsion spring has fully released its elastic force, which will cause the rocker 2 to sway and shake, easily causing noise. In this embodiment, the rocker 2 can stop quickly when it reaches the stop block 12 after the flexible rope 8 is released.

[0038] In a further design, the outer surface of the rocker arm 2 is provided with a concave arc-shaped groove 13. When the elastic reset member 3 is reset, the stop block 12 abuts against the arc-shaped groove 13. The arc-shaped groove 13 can lock the stop block 12. When the stop block 12 enters the arc-shaped groove 13, the rocker arm 2 will not shake due to elastic force. Only when subjected to a certain amount of external force can the arc-shaped groove 13 disengage from the stop block 12. This design can also prevent personnel from accidentally touching the flexible rope 8 or the button outside the explosion-proof box 4, causing the mechanism to start. Only when a certain pulling force is reached can the rocker arm 2 be pulled up, causing the arc-shaped groove 13 to disengage from the stop block 12.

[0039] The rocker arm 2 can be L-shaped. This L-shape can be an arc-shaped structure similar to an L, or it can consist of two plates intersecting at a certain angle. This design allows the flexible rope 8 to be pulled horizontally, thus saving on the overall height of the circuit breaker. Since the push rod 7 needs to perform a downward pressing action when pulling the flexible rope 8, the direction of pulling the flexible rope 8 needs to be tilted towards the push rod 7. To avoid interference between the flexible rope 8 and the push rod 7, it is preferable that the end of the rocker arm 2 connected to the flexible rope 8 is at a higher height than the end connected to the push rod 7. Even if the flexible rope 8 extends from above the push rod 7 to the explosion-proof box 4, it will not interfere with the push rod 7.

[0040] In a further design, when the outer side of the rocker 2 abuts against the stop block 12, both ends of the rocker 2 are located on either side of the vertical plane 14 passing through the rotation center of the rocker 2, and the inclination angle between the end of the rocker 2 connected to the flexible rope 8 and the vertical plane 14 is less than the inclination angle between the end of the rocker 2 connected to the top rod 7 and the vertical plane 14. For ease of description, this utility model divides the rocker 2 into a pulling section 201 and a pressing section 202. The pulling section 201 is connected to the flexible rope 8, and the pressing section 202 is connected to the top rod 7. Therefore, when the outer side of the rocker 2 abuts against the stop block 12, the pulling section 201 and the pressing section 202 are located on either side of the vertical plane 14, that is, the stop block 12 is offset to the left relative to the rotating shaft 1. Figure 1As shown, when the flexible rope 8 is pulled to rotate the rocker 2 clockwise, the stop block 12 will not obstruct the rotational movement of the pulling section 201. Furthermore, at this time, the inclination angle between the pulling section 201 and the vertical plane 14 is less than the inclination angle between the pressing section 202 and the vertical plane 14. This makes the pressing section 202 more horizontal, facilitating downward pressing of the top rod 7, while the pulling section 201 is more vertical, allowing the flexible rope 8 to be pulled horizontally.

[0041] Example 3

[0042] Based on the above embodiments, the pull-cord operating mechanism further includes a guide plate 15 fixed to the outside of the circuit breaker housing 6. The guide plate 15 is provided with a lead wire groove 16. The flexible rope 8 passes through the lead wire groove 16 and extends to the door of the explosion-proof box 4. The function of the lead wire groove 16 is to hold the flexible rope 8, so that the flexible rope 8 is pulled along the line connecting the end of the rocker 2 to the lead wire groove 16. After the flexible rope 8 extends out of the lead wire groove 16, it can extend to the explosion-proof box 4 in any direction. The button position on the surface of the explosion-proof box 4 is arbitrary.

[0043] As the flexible rope 8 pulls towards the top rod 7, the surface of the guide plate 15 is parallel to the central axis of the rotating shaft 1, and the guide plate 15 is arranged on the side closer to the top rod 7.

[0044] The medium-voltage or high-voltage circuit breaker is equipped with a closing switch and a opening switch respectively. Therefore, the pull-wire operating mechanism described in this utility model is also provided in two. The two pull-wire operating mechanisms can share a guide plate 15. The guide plate 15 is provided with two lead wire grooves 16, which limit the flexible ropes 8 in the two pull-wire operating mechanisms respectively.

[0045] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0046] In this specification, the illustrative expressions of the terms do not necessarily refer to the same embodiments. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments.

[0047] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A pull-wire operating mechanism for a circuit breaker, characterized in that: It includes a rotating shaft, a rocker plate mounted on the rotating shaft, and an elastic reset component. The rotating shaft is installed outside the housing of the circuit breaker. The middle part of the rocker plate is connected to the rotating shaft. The two ends of the rocker plate are respectively provided with a top rod and a flexible rope. The top rod extends into the housing and is directly opposite the opening or closing switch. The flexible rope extends to the cabinet door of the explosion-proof box. When the flexible rope is pulled, the top rod presses against the opening or closing switch, and at the same time the elastic reset element is compressed to store energy. The push rod separates from the opening or closing switch under the elastic force of the elastic reset component.

2. The pull-wire operating mechanism for a circuit breaker according to claim 1, characterized in that: A limit rod is fixed on the rotating shaft, and the elastic reset element is a torsion spring, with one end of the torsion spring fixed and the other end hooked on the limit rod.

3. The pull-wire operating mechanism for a circuit breaker according to claim 2, characterized in that: It also includes a mounting bracket, which includes a base plate and side plates located on both sides of the base plate, and the rotating shaft is rotatably connected to the two side plates; the mounting bracket is provided with a crossbar, and the fixed end of the torsion spring presses on the crossbar.

4. The pull-wire operating mechanism for a circuit breaker according to claim 3, characterized in that: The side plate is provided with a stop block. When the elastic reset member is reset, the outer side of the rocker plate abuts against the stop block.

5. The pull-wire operating mechanism for a circuit breaker according to claim 4, characterized in that: The rocker is L-shaped, and the end of the rocker connected to the flexible rope is at a higher height than the end connected to the top rod.

6. The pull-wire operating mechanism for a circuit breaker according to claim 4, characterized in that: The outer side of the rocker is provided with a concave arc-shaped groove. When the elastic reset member is reset, the stop block abuts against the arc-shaped groove.

7. The pull-wire operating mechanism for a circuit breaker according to claim 5, characterized in that: When the outer side of the rocker plate abuts against the stop block, the two ends of the rocker plate are located on both sides of the vertical plane passing through the center of rotation of the rocker plate, and the inclination angle between the end of the rocker plate connected to the flexible rope and the vertical plane is smaller than the inclination angle between the end of the rocker plate connected to the top rod and the vertical plane.

8. The pull-wire operating mechanism for a circuit breaker according to claim 1, characterized in that: It also includes a guide plate fixed to the outside of the circuit breaker housing, the guide plate having a lead wire groove, the flexible rope passing through the lead wire groove and extending to the cabinet door of the explosion-proof box.

9. The pull-wire operating mechanism for a circuit breaker according to claim 8, characterized in that: The surface of the guide plate is parallel to the central axis of the rotating shaft, and the guide plate is located on the side closer to the top rod.

10. The pull-wire operating mechanism for a circuit breaker according to claim 1, characterized in that: The rocker consists of two parallel L-shaped plates, with the top rod located between the two L-shaped plates and rotatably connected by a pin.

Images