Large-specification circuit breaker operating mechanism capable of avoiding out-of-place overtravel of cantilever

Abstract

The utility model relates to the technical field of circuit breaker production, in particular to a large-specification circuit breaker operating mechanism capable of avoiding improper overtravel of cantilevers, which comprises a first rotating shaft, a second rotating shaft, an expansion sleeve coupling, a first cantilever and a second cantilever. The first rotating shaft penetrates through the main mechanism frame body, three first cantilevers are installed on the first rotating shaft, the second rotating shaft penetrates through the auxiliary mechanism frame body, and four second cantilevers are installed on the second rotating shaft; according to the utility model, the relative circumferential positions of the first rotating shaft and the second rotating shaft are adjusted by loosening and tightening the expansion sleeve coupling, that is, a compensation dislocation angle capable of compensating factors such as assembly errors is formed between the first cantilever and the second cantilever, so that when the first cantilever is in contact with the body contact, the body overtravel is in place; and when the second cantilever is in contact with the body contact, the body can also overtravel in place.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker manufacturing technology, and in particular to a large-size circuit breaker operating mechanism that can prevent the cantilever from overtraveling and failing to reach the correct position. Background Technology

[0002] Circuit breakers are one of the important components in low-voltage power grids. Small frame circuit breakers are used in large numbers in low-voltage distribution cabinets. With the miniaturization and intelligent development of low-voltage distribution cabinets, the overall size of the distribution cabinets is getting smaller and the density of small frames is getting higher. Therefore, low-voltage switchgear manufacturers have put forward higher requirements for the temperature rise of the outgoing terminals of frame circuit breakers. It is necessary to meet the requirement that frame circuit breakers do not degrade in high-temperature environments. This is especially important in some applications with high ambient temperature requirements.

[0003] The operating mechanism of a large-size circuit breaker is mounted on the base body via pins and bolts. It achieves energization and de-energization functions through energy storage, closing, and opening. After energy storage, pressing the closing button puts the mechanism in the closed state, and the base body contacts are in the connected position when the mechanism is closed. The operating mechanism of a large-size circuit breaker typically has 7 levels (4 levels on the first cantilever closest to the main mechanism frame, 3 levels on the second cantilever closest to the auxiliary mechanism frame, for a total of 7 levels). When the mechanism is open, the base body contacts are in the disconnected position.

[0004] Existing operating mechanisms for large-scale circuit breakers have been found to have shortcomings during use. When the mechanism closes, the first cantilever closer to the main mechanism frame makes contact with the main body contact after exceeding its travel limit. However, the second cantilever closer to the auxiliary mechanism frame is prone to insufficient travel when making contact with the main body contact due to assembly errors or other factors. Therefore, it is necessary to optimize and improve the existing operating mechanisms for large-scale circuit breakers. Utility Model Content

[0005] The purpose of this utility model is to overcome the above-mentioned problems existing in the traditional technology and provide a large-specification circuit breaker operating mechanism that can avoid the cantilever overtravel from not being in place.

[0006] To achieve the above-mentioned technical objectives and effects, this utility model is implemented through the following technical solution:

[0007] A large-size circuit breaker operating mechanism that avoids overtravel of the cantilever arm is not fully engaged includes a first rotating shaft, a second rotating shaft, an expansion coupling, a first cantilever arm, and a second cantilever arm. The first rotating shaft and the second rotating shaft are connected by the expansion coupling. The first rotating shaft passes through the main mechanism frame and has three first cantilever arms mounted on it. The second rotating shaft passes through the auxiliary mechanism frame and has four second cantilever arms mounted on it. By tightening or loosening the expansion coupling, the relative circumferential position of the first rotating shaft and the second rotating shaft can be adjusted, thereby ensuring that when the first cantilever arm contacts the main body contact, the main body is fully engaged, and when the second cantilever arm contacts the main body contact, the main body is also fully engaged.

[0008] Furthermore, in the aforementioned large-size circuit breaker operating mechanism that avoids overtravel of the cantilever, the outer diameters of the first and second rotating shafts are equal or unequal.

[0009] Furthermore, in the aforementioned large-size circuit breaker operating mechanism that avoids overtravel of the cantilever, the first rotating shaft is fixedly connected to the first cantilever by welding, and the second rotating shaft is fixedly connected to the second cantilever by welding.

[0010] Furthermore, in the above-mentioned large-specification circuit breaker operating mechanism that can avoid overtravel of the cantilever, the first and second cantilever are each provided with a sleeve through hole that matches the outer diameter of the shaft.

[0011] Furthermore, in the above-mentioned large-size circuit breaker operating mechanism that can avoid overtravel of the cantilever, the outer surfaces of the first and second rotating shafts are provided with anti-torsion keyways, and the first and second cantilever arms are provided with protruding keys that fit into the anti-torsion keyways at the inner wall of the through hole.

[0012] Furthermore, in the aforementioned large-size circuit breaker operating mechanism that avoids overtravel of the cantilever, the expansion coupling includes an expansion sleeve seat, a first convex tube portion, a second convex tube portion, and a pressure adjusting screw. The expansion sleeve seat has a first convex tube portion for inserting a first rotating shaft and a second convex tube portion for inserting a second rotating shaft installed on both sides. The expansion sleeve seat has an annular cavity inside. The outer end of the annular cavity is connected to several compression chambers for easy installation of the pressure adjusting screw. The inner ends of the annular cavity are connected to a first expansion sleeve cavity extending into the first convex tube portion and a second expansion sleeve cavity extending into the second convex tube portion.

[0013] The beneficial effects of the utility model are:

[0014] This utility model has a reasonable structural design, mainly consisting of a first rotating shaft, a second rotating shaft, an expansion sleeve coupling, a first cantilever, and a second cantilever. On the one hand, it replaces the traditional one-piece rotating shaft with two separate rotating shafts, reducing the processing difficulty of assembling the rotating shaft and the cantilever, which is conducive to mass production. On the other hand, the relative circumferential position of the first rotating shaft and the second rotating shaft is adjusted by tightening and loosening the expansion sleeve coupling, so that a compensating misalignment angle can be formed between the first cantilever and the second cantilever to compensate for factors such as assembly errors. Thus, when the first cantilever contacts the main body contact, the main body can also overtravel to the correct position, and when the second cantilever contacts the main body contact, the main body can also overtravel to the correct position.

[0015] Of course, any product implementing this utility model does not necessarily need to achieve all of the above advantages at the same time. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall main structure of this utility model;

[0018] Figure 2 This is a top view of the overall structure of this utility model;

[0019] Figure 3 This is a schematic diagram of the structure of the first rotating shaft and the first cantilever in this utility model;

[0020] Figure 4 This is a schematic diagram of the structure of the second rotating shaft and the second cantilever in this utility model;

[0021] Figure 5 This is a schematic diagram of the external structure of the expansion sleeve coupling in this utility model;

[0022] Figure 6 This is a schematic diagram of the internal structure of the expansion sleeve coupling in this utility model;

[0023] The components represented by each number in the attached diagram are explained below:

[0024] 1-First rotating shaft, 2-Second rotating shaft, 3-Expansion sleeve coupling, 301-Expansion sleeve seat, 302-First convex tube part, 303-Second convex tube part, 304-Pressure adjusting screw, 305-Extrusion chamber, 306-Annular cavity, 307-First expansion sleeve cavity, 308-Second expansion sleeve cavity, 4-Main mechanism frame, 5-First cantilever, 6-Secondary mechanism frame, 7-Second cantilever. Detailed Implementation

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

[0026] like Figures 1-6 As shown, this embodiment provides a large-size circuit breaker operating mechanism that can avoid overtravel failure of the cantilever, including a first rotating shaft 1, a second rotating shaft 2, an expansion coupling 3, a first cantilever 5, and a second cantilever 7. The first rotating shaft 1 and the second rotating shaft 2 are connected by the expansion coupling 3. The first rotating shaft 1 passes through the main mechanism frame 4 and has three first cantilever 5s mounted on it. The second rotating shaft 2 passes through the auxiliary mechanism frame 6 and has four second cantilever 7s mounted on it. The relative circumferential position of the first rotating shaft 1 and the second rotating shaft 2 is adjusted by tightening and loosening the expansion coupling 3, thereby achieving overtravel of the main body when the first cantilever 5 contacts the main body contact, and simultaneously, when the second cantilever 7 contacts the main body contact, the main body can also overtravel.

[0027] In this embodiment, the outer diameters of the first rotating shaft 1 and the second rotating shaft 2 are equal.

[0028] In this embodiment, the first rotating shaft 1 is fixedly connected to the first cantilever 5 by welding, and the second rotating shaft 2 is fixedly connected to the second cantilever 7 by welding.

[0029] In this embodiment, the first cantilever 5 and the second cantilever 7 each have a through hole that matches the outer diameter of the shaft.

[0030] In this embodiment, the expansion sleeve coupling 3 includes an expansion sleeve seat 301, a first convex tube portion 302, a second convex tube portion 303, and a pressure adjusting screw 304. The expansion sleeve seat 301 has a first convex tube portion 302 for inserting into a first rotating shaft 1 and a second convex tube portion 303 for inserting into a second rotating shaft 2, respectively, installed on both sides. The expansion sleeve seat 301 has an annular cavity 306 inside. The outer end of the annular cavity 306 is connected to several compression chambers 305 for facilitating the installation of the pressure adjusting screw 304. The inner ends of the annular cavity 306 are respectively connected to a first expansion sleeve cavity 307 extending into the first convex tube portion 302 and a second expansion sleeve cavity 308 extending into the second convex tube portion 303.

[0031] A specific application of this embodiment is as follows: The operating mechanism of this large-size circuit breaker mainly consists of a first rotating shaft 1, a second rotating shaft 2, an expansion sleeve coupling 3, a first cantilever 5, and a second cantilever 7. On the one hand, the two separate rotating shafts replace the traditional one-piece rotating shaft, reducing the processing difficulty of assembling the rotating shaft and the cantilever, which is conducive to mass production. On the other hand, the relative circumferential position of the first rotating shaft 1 and the second rotating shaft 2 is adjusted by tightening and loosening the expansion sleeve coupling 3, so that a compensation misalignment angle can be formed between the first cantilever 5 and the second cantilever 7 to compensate for factors such as assembly errors. Thus, when the first cantilever 5 contacts the main body contact, the main body can also overtravel to the correct position, and when the second cantilever 7 contacts the main body contact, the main body can also overtravel to the correct position.

[0032] Example 2

[0033] The difference between this embodiment and Embodiment 1 is that the outer diameters of the first rotating shaft 1 and the second rotating shaft 2 are not equal.

[0034] Example 3

[0035] The difference between this embodiment and Embodiment 1 is that the outer surfaces of the first rotating shaft 1 and the second rotating shaft 2 are provided with anti-torsion keyways, and the first cantilever 5 and the second cantilever 7 are provided with protruding keys that fit into the anti-torsion keyways at the inner wall of the through hole.

[0036] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to specific implementation methods. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A large-size circuit breaker operating mechanism that avoids overtravel and failure to reach the correct position, characterized in that, The system includes a first rotating shaft, a second rotating shaft, an expansion sleeve coupling, a first cantilever, and a second cantilever. The first and second rotating shafts are connected by the expansion sleeve coupling. The first rotating shaft passes through the main mechanism frame and has three first cantilever arms mounted on it. The second rotating shaft passes through the auxiliary mechanism frame and has four second cantilever arms mounted on it. The relative circumferential position of the first and second rotating shafts is adjusted by tightening or loosening the expansion sleeve coupling, thereby ensuring that when the first cantilever arm contacts the main body contact head, the main body can also overtravel to the correct position, and when the second cantilever arm contacts the main body contact head, the main body can also overtravel to the correct position.

2. The large-specification circuit breaker operating mechanism according to claim 1, which can avoid overtravel and failure to reach the correct position, is characterized in that... The outer diameters of the first and second rotating shafts may be equal or unequal.

3. The large-specification circuit breaker operating mechanism according to claim 2, which avoids overtravel of the cantilever and failure to reach the correct position, is characterized in that... The first rotating shaft is fixedly connected to the first cantilever by welding, and the second rotating shaft is fixedly connected to the second cantilever by welding.

4. The large-specification circuit breaker operating mechanism according to claim 3, which avoids overtravel of the cantilever and failure to reach the correct position, is characterized in that... The first and second cantilever arms each have a through hole that matches the outer diameter of the shaft.

5. The large-specification circuit breaker operating mechanism according to claim 4, which can avoid overtravel and failure to reach the correct position, is characterized in that... The first and second rotating shafts have anti-torsion keyways on their outer surfaces facing inward, and the first and second cantilever arms have protruding keys that engage with the anti-torsion keyways on the inner walls of the through holes.

6. The large-size circuit breaker operating mechanism according to claim 4 or 5, which avoids overtravel of the cantilever and failure to reach the correct position, is characterized in that... The expansion sleeve coupling includes an expansion sleeve seat, a first convex tube portion, a second convex tube portion, and a pressure adjusting screw. The expansion sleeve seat has a first convex tube portion for inserting a first rotating shaft and a second convex tube portion for inserting a second rotating shaft installed on both sides. The expansion sleeve seat has an annular cavity inside. The outer end of the annular cavity is connected to several extrusion chambers for easy installation of the pressure adjusting screw. The inner ends of the annular cavity are respectively connected to a first expansion sleeve cavity extending into the first convex tube portion and a second expansion sleeve cavity extending into the second convex tube portion.

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