A DC cubicle circuit breaker propulsion mechanism

Abstract

The utility model relates to the field of switchgear, disclose a kind of DC cabinet circuit breaker propulsion mechanism, including spacing fixed plate, circuit breaker main body, open and close propulsion mechanism, three mutual combination use play role, upgrade the single propulsion form of traditional screw nut and worm gear, utilize the combination of double connecting rod and segmented bevel gear screw rod and the like component, simplified structure reduction cost is realized, spacing fixed plate also played the role of spacing in propulsion process, and the gear ratio of bevel gear A and bevel gear B is adjustable, so as to be enough to cope with the problem of increased resistance in propulsion process, can be adjusted labor-saving mode or efficiency mode according to actual working condition.

Description

Technical Field

[0001] This utility model relates to the field of switchgear, specifically a DC cabinet circuit breaker propulsion mechanism. Background Technology

[0002] The main electrical components and moving contacts of the circuit breaker drive mechanism are all installed on the trolley. Therefore, ensuring that the trolley can be pulled out and pushed out flexibly and reliably is one of the important aspects of the normal operation of this type of switchgear. Moreover, because the force required to insert and pull out the switch contacts is relatively large, it also acts as an assist device for contact insertion and separation.

[0003] For example, Chinese Patent Publication No. CN1790848A discloses a novel circuit breaker trolley propulsion mechanism. This mechanism is an integral structure that relies on a movable frame carrying the circuit breaker moving back and forth on a fixed frame equipped with guide rails to move the circuit breaker from the test position to the working position. The switchgear only needs a bracket to support the fixed frame, without the need for guide rails. The movement of the circuit breaker occurs only within the propulsion mechanism itself and has no relative motion relationship with the switchgear, making the propulsion operation flexible and reliable. The transmission mechanism is a screw-nut mechanism with a clutch device. When the circuit breaker trolley is pushed to the working position or retracted to the test position, the clutch device automatically disengages. Even if the operator continues to rotate the screw, the circuit breaker will not move, thus avoiding the operator relying on feeling to judge whether the circuit breaker has moved into position.

[0004] For example, Chinese Patent CN201426016Y discloses a circuit breaker trolley propulsion mechanism and a high-voltage switchgear for the trolley. This mechanism relies on a movable frame carrying the circuit breaker moving back and forth on a fixed frame equipped with guide rails to move the circuit breaker from the test position to the working position, making the propulsion operation flexible and reliable. The transmission mechanism is a screw-nut mechanism with a clutch device. When the circuit breaker trolley is pushed to the working position or retracted to the test position, the clutch device automatically disengages, preventing the circuit breaker from moving even if the operator continues to rotate the screw. This avoids the operator relying on feel to judge whether the circuit breaker has moved into position. The operation is simple, and the circuit breaker positioning is accurate.

[0005] In summary, existing circuit breaker propulsion mechanisms have many drawbacks. Currently, the main types of circuit breaker propulsion mechanisms in handcart-type switchgear are screw-nut type and worm gear type. Screw-nut type and worm gear type have slow propulsion speed, long operation time, complex structure, and high manufacturing cost. In particular, the resistance increases significantly during the contact process between moving and stationary contacts, which can easily cause problems such as deformation of transmission components, asynchrony, and handcart misalignment, affecting the performance and service life. Utility Model Content

[0006] To address the shortcomings of existing technologies, this utility model provides a DC switchboard circuit breaker propulsion mechanism to solve the aforementioned problems.

[0007] To achieve the above objectives, this utility model is implemented through the following technical solution.

[0008] A DC switchboard circuit breaker propulsion mechanism includes a limiting and fixing plate, a circuit breaker body, and an opening and closing propulsion mechanism. The circuit breaker body is slidably connected to the limiting and fixing plate, and one end of the opening and closing propulsion mechanism is connected to the limiting and fixing plate, while the other end is connected to the circuit breaker body.

[0009] The opening and closing propulsion mechanism includes a positioning plate, a propulsion plate, double connecting rods A and B, a segmented bevel gear screw, limit nuts A and B, and a transmission handle assembly. The positioning plate is connected to the limit fixing plate, and the propulsion plate is connected to the circuit breaker body. One side of double connecting rod A is rotatably connected to the propulsion plate, and the other side is movably connected to limit nuts A and B. One side of double connecting rod B is rotatably connected to the positioning plate, and the other side is movably connected to limit nuts A and B.

[0010] The segmented bevel screw engages with both limit nut A and limit nut B via threads.

[0011] The transmission handle assembly is meshed with a segmented bevel gear screw, upgrading the traditional single propulsion form of lead screw nut and worm gear. By using a combination of components such as double connecting rods and segmented bevel gear screws, the structure is simplified and the cost is reduced. The limiting and fixing plate also plays a role in limiting the propulsion process. Furthermore, the gear ratio of bevel gear A and bevel gear B is adjustable, which is sufficient to cope with the problem of increased resistance during propulsion. The labor-saving mode or efficiency mode can be adjusted according to the actual working conditions.

[0012] Preferably, the internal threads of the limiting nut A and the internal threads of the limiting nut B have opposite directions of rotation.

[0013] Preferably, the segmented bevel gear screw includes screw A, screw B, and bevel gear A.

[0014] Preferably, the screw A, screw B, and bevel gear A are arranged in order from left to right.

[0015] Preferably, the external thread of the screw A is adapted to the limiting nut A.

[0016] Preferably, the external thread of the screw B is adapted to the limiting nut B.

[0017] Preferably, the transmission handle assembly includes a bevel gear transmission rod, a nested handle, double-sided limiting plates, and a single-direction limiting plate.

[0018] Preferably, one end of the bevel gear transmission rod is provided with a bevel gear B, which meshes with the bevel gear A, and the other end is fitted with the nested handle.

[0019] Preferably, one end of the double-sided limiting plate limits bevel gear A, and the other end limits bevel gear B.

[0020] Preferably, a bevel gear transmission rod passes through the middle of the single-position limiting plate and is fixed to the limiting fixing plate.

[0021] Compared with existing technologies, this utility model discloses a DC cabinet circuit breaker propulsion mechanism, including a limit fixing plate, a circuit breaker body, and an opening and closing propulsion mechanism. The three components work together to upgrade the traditional single propulsion form of lead screw nut and worm gear. By using a combination of components such as double connecting rod and segmented bevel gear screw, the structure is simplified and the cost is reduced. The limit fixing plate also plays a role in limiting the propulsion process. Furthermore, the gear ratio of bevel gear A and bevel gear B is adjustable, which is sufficient to cope with the problem of increased resistance during propulsion. The effort-saving mode or efficiency mode can be adjusted according to the actual working conditions. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the initial state structure of the DC cabinet circuit breaker propulsion mechanism of this utility model;

[0023] Figure 2 This is a schematic diagram of the propulsion process of the DC cabinet circuit breaker propulsion mechanism of this utility model;

[0024] Figure 3 This is a schematic diagram of the initial state of the opening and closing propulsion mechanism of this utility model;

[0025] Figure 4 This is a schematic diagram of the propulsion process of the opening and closing propulsion mechanism of this utility model;

[0026] Figure 5 This is a schematic diagram of the opening and closing limiting nut A and the limiting nut B of this utility model;

[0027] Figure 6 This is a schematic diagram of the DC switchgear push mechanism of this utility model;

[0028] Figure 7 This is a schematic diagram of the installation of the segmented bevel screw of this utility model. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0030] A DC switchboard circuit breaker propulsion mechanism includes a limiting fixing plate 1, a circuit breaker body 2, and an opening / closing propulsion mechanism 3. The circuit breaker body 2 is slidably connected to the limiting fixing plate 1, and a slide rail can be provided at the connection point. One end of the opening / closing propulsion mechanism 3 is connected to the limiting fixing plate 1, and the other end is connected to the circuit breaker body 2. The opening / closing propulsion mechanism 3 includes a positioning plate 31, a propulsion plate 32, a double connecting rod A 33, a double connecting rod B 34, a segmented bevel gear screw 35, a limiting nut A 36, a limiting nut B 37, and a transmission handle assembly 38. The positioning plate 31 is connected to the limiting plate 1. On the fixed plate 1, the push plate 32 is connected to the circuit breaker body 2. The double connecting rod A33 is rotatably connected to the push plate 32 on one side, and the limit nut A36 and limit nut B37 are respectively connected to it on the other side. The double connecting rod B34 is rotatably connected to the positioning plate 31 on one side, and the limit nut A36 and limit nut B37 are respectively connected to it on the other side. The segmented bevel screw 35 is threadedly engaged with both the limit nut A36 and the limit nut B37. The transmission handle assembly 38 is engaged with the segmented bevel screw 35.

[0031] The internal threads of the limiting nut A36 and the limiting nut B37 have opposite directions of rotation. Whether the internal threads of the limiting nut A36 and the limiting nut B37 are left-handed or right-handed depends on the actual working conditions. As long as the two threads are opposite in direction, it is sufficient to ensure that the double connecting rod A33 and the double connecting rod B34 can be properly matched and opened and closed.

[0032] The segmented bevel gear screw 35 includes screw A351, screw B352, and bevel gear A353.

[0033] The screw A351, screw B352, and bevel gear A353 are arranged from left to right.

[0034] The external thread of screw A351 is adapted to limit nut A36, and the external thread of screw B352 is adapted to limit nut B37. Screws A351 and B352 are symmetrically arranged with the same length. The composition of screws A351, B352 and bevel gear A353 can be described by text alone. The diagram is not shown in detail because showing the threads would make the entire segmented bevel gear screw 35 black and cause the diagram to be blurry.

[0035] The transmission handle assembly 38 includes a bevel gear transmission rod 381, a nested handle 382, ​​a double-sided limiting plate 383, and a single-direction limiting plate 384. One end of the bevel gear transmission rod 381 is provided with a bevel gear B3811, which meshes with a bevel gear A353, and the other end is fitted into the nested handle 382. One end of the double-sided limiting plate 383 limits the bevel gear A353, and the other end limits the bevel gear B3811. The bevel gear transmission rod 381 passes through the middle of the single-direction limiting plate 384 and is fixed on the limiting fixing plate 1. The tooth ratio of bevel gear A353 and bevel gear B3811 can be adjusted according to the actual working conditions. There are two modes: a labor-saving mode and an efficiency mode. The labor-saving mode is when the tooth ratio of bevel gear B is less than the tooth ratio of bevel gear A, while the efficiency mode is the opposite.

[0036] The working method is as follows:

[0037] Initial state: The opening and closing propulsion mechanism 3 is in the test position, at which time the contacts on the circuit breaker body 2 are isolated from the copper busbar of the cabinet.

[0038] Propulsion process: When the nested handle 382 is rotated, the bevel gear B3811 drives the bevel gear A353 to rotate. At the same time, the screw A351 drives the nut A to move towards the center, and the screw B352 drives the nut B to move towards the center. The double connecting rod A33 and the double connecting rod B34 retract synchronously. The push plate 32 connected to the circuit breaker body 2 moves forward, driving the circuit breaker body 2 to move forward on the slide rail of the limit fixing plate 1 until the contacts of the circuit breaker body 2 and the cabinet copper busbar engage, achieving the state of circuit connection.

[0039] Reverse process: When the nested handle 382 is rotated in the opposite direction, the bevel gear B3811 drives the bevel gear A353 to rotate. At the same time, the screw A351 drives the nut A to move outward, the screw B352 drives the nut B to move outward, and the double connecting rod A33 and the double connecting rod B34 open synchronously. The limiting fixing plate 1 connected to the circuit breaker body 2 moves backward, which in turn drives the circuit breaker body 2 to move backward, causing the circuit breaker contacts and the cabinet copper busbar to separate, thus achieving the circuit breaking state.

[0040] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0041] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0042] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A DC switchboard circuit breaker propulsion mechanism, characterized in that: The circuit breaker includes a limiting and fixing plate (1), a circuit breaker body (2), and an opening and closing pushing mechanism (3). The circuit breaker body (2) is slidably connected to the limiting and fixing plate (1). One end of the opening and closing pushing mechanism (3) is connected to the limiting and fixing plate (1), and the other end is connected to the circuit breaker body (2). The opening and closing propulsion mechanism (3) includes a positioning plate (31), a propulsion plate (32), a double connecting rod A (33), a double connecting rod B (34), a segmented bevel screw (35), a limit nut A (36), a limit nut B (37), and a transmission handle assembly (38). The positioning plate (31) is connected to the limit fixing plate (1), and the propulsion plate (32) is connected to the circuit breaker body (2). One side of the double connecting rod A (33) is rotatably connected to the propulsion plate (32), and the other side is movably connected to the limit nut A (36) and the limit nut B (37). One side of the double connecting rod B (34) is rotatably connected to the positioning plate (31), and the other side is movably connected to the limit nut A (36) and the limit nut B (37). The segmented bevel screw (35) is threadedly engaged with both the limiting nut A (36) and the limiting nut B (37). The transmission handle assembly (38) is engaged with the segmented bevel screw (35).

2. The DC switchgear circuit breaker propulsion mechanism according to claim 1, characterized in that: The internal threads of the limiting nut A (36) and the internal threads of the limiting nut B (37) have opposite directions of rotation.

3. The DC switchgear circuit breaker propulsion mechanism according to claim 2, characterized in that: The segmented bevel screw (35) includes screw A (351), screw B (352), and bevel gear A (353).

4. The DC switchgear circuit breaker propulsion mechanism according to claim 3, characterized in that: The screw A (351), screw B (352), and bevel gear A (353) are arranged from left to right.

5. The DC switchgear circuit breaker propulsion mechanism according to claim 4, characterized in that: The external thread of the screw A (351) is adapted to the limiting nut A (36).

6. The DC switchgear circuit breaker propulsion mechanism according to claim 5, characterized in that: The external thread of the screw B (352) is adapted to the limiting nut B (37).

7. The DC switchgear circuit breaker propulsion mechanism according to claim 6, characterized in that: The transmission handle assembly (38) includes a bevel gear transmission rod (381), a nested handle (382), a double-sided limiting plate (383), and a single-direction limiting plate (384).

8. The DC switchgear circuit breaker propulsion mechanism according to claim 7, characterized in that: One end of the bevel gear transmission rod (381) is provided with a bevel gear B (3811) and meshes with a bevel gear A (353), while the other end is fitted with a nested handle (382).

9. The DC switchgear circuit breaker propulsion mechanism according to claim 8, characterized in that: The double-sided limiting plate (383) limits bevel gear A (353) at one end and bevel gear B (3811) at the other end.

10. The DC switchgear circuit breaker propulsion mechanism according to claim 9, characterized in that: A bevel gear transmission rod (381) is inserted through the middle of the single-direction limiting plate (384) and fixed on the limiting fixing plate (1).

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