A 126kV vacuum circuit breaker assembly positioning and sensor positioning device

Abstract

This invention discloses a 126kV vacuum circuit breaker assembly positioning and sensor positioning device, relating to the field of vacuum circuit breaker technology. It includes a transmission box, on which a positioning device with positioning holes for opening, closing, and rigid closing points is fixed. A transmission shaft passes through the transmission box, with one end fixed to an outer crank arm and the other end connected to an adjusting joint. Positioning holes are set on the outer crank arm, and positioning pins pass through the positioning holes of the outer crank arm and either of the positioning holes to achieve precise positioning. A support frame, fastened to the transmission box, is fitted around the transmission shaft. Connecting bolts are fastened to the transmission shaft, and a connecting joint is provided between the connecting bolts and the sensor. The sensor rotates synchronously with the transmission shaft. This invention achieves precise assembly of the opening and closing positions through the rigid positioning holes, and ensures stable sensor fixation through the support frame and connecting structure, balancing assembly accuracy and testing reliability.

Description

Technical Field

[0001] This invention relates to the field of vacuum circuit breaker technology, specifically to a 126kV vacuum circuit breaker assembly positioning and sensor positioning device. Background Technology

[0002] High-voltage vacuum circuit breakers are key equipment in power systems, primarily responsible for carrying and interrupting current in transmission and distribution lines to ensure the safe and stable operation of the power system. Among them, 126kV vacuum circuit breakers, due to their high voltage level and compact structure, place extremely high demands on the reliability of their mechanical operations. Parameters reflecting the mechanical characteristics of high-voltage circuit breakers, such as opening and closing time, speed, travel, overtravel, three-phase asynchrony, and bounce time, are core indicators for evaluating the performance and quality of the circuit breaker. Therefore, accurate mechanical characteristic testing is crucial before the circuit breaker leaves the factory and after on-site installation.

[0003] However, the existing assembly and testing process for 126kV vacuum circuit breakers mainly has the following two problems: On the one hand, the assembly and positioning of the opening and closing positions are inaccurate. Currently, during the assembly process of the circuit breaker transmission box and the external crank arm, due to the lack of a unified and intuitive rigid positioning benchmark, operators often rely on visual inspection or indirect measurement to determine the positions of the vacuum interrupter's contact points, opening points, and closing points. Constrained by component processing errors and accumulated errors from manual assembly, this easily leads to deviations between the contact state of the vacuum interrupter inside the circuit breaker and the indicated position of the external transmission system. This inconsistency directly results in key data such as stroke and overtravel in subsequent mechanical characteristic tests failing to meet design requirements, and in severe cases, may even affect the normal opening and closing functions of the circuit breaker.

[0004] On the other hand, the fixing methods for sensors used in mechanical characteristic testing are unreliable and have poor adaptability. During mechanical characteristic tests, magnetic or simple clamp-type brackets are typically used to fix angular or linear displacement sensors to the circuit breaker body. Because 126kV vacuum circuit breakers experience severe vibrations during opening and closing, conventional fixing brackets cannot guarantee the coaxiality and connection rigidity between the sensor and the drive shaft, easily causing sensor shaking or slippage. This leads to distortion of the measured angle or displacement data, severely affecting the accuracy and efficiency of the test results. Furthermore, sensors from different manufacturers vary in size. Summary of the Invention

[0005] (a) Technical problems to be solved The technical problem to be solved by the present invention is to provide a 126kV vacuum circuit breaker assembly positioning and sensor positioning device, which can not only realize the precise assembly and positioning of the circuit breaker opening and closing positions, but also provide a stable and universal fixed platform for mechanical characteristic testing sensors.

[0006] (II) Technical Solution To solve the above-mentioned technical problems, the technical solution provided by the present invention is as follows: a 126kV vacuum circuit breaker assembly positioning and sensor positioning device, comprising a transmission box, a positioning device fixedly mounted on the transmission box, the positioning device having an opening positioning hole, a closing positioning hole and a rigid contact point positioning hole; a transmission shaft passing through the transmission box, one end of the transmission shaft having an outer crank arm passing through and fixed thereon, and the other end of the transmission shaft being connected to an adjusting joint for connecting a vacuum interrupter; an outer crank arm positioning hole being provided on the outer crank arm, and a positioning pin selectively passing through both the outer crank arm positioning hole and any positioning hole on the positioning device; a support frame being fitted around the transmission shaft, the support frame being fastened to the transmission box; a connecting bolt being fastened to the transmission shaft, and a connecting joint being provided between the connecting bolt and a sensor for detecting mechanical characteristics, the sensor rotating synchronously with the transmission shaft during the opening and closing process.

[0007] As an improvement, when the positioning pin is simultaneously inserted into the positioning hole of the outer crank arm and the positioning hole of the rigid engagement point, the vacuum interrupter is in the rigid engagement position; the adjusting joint is used to rotate and adjust to eliminate the deviation when assembly deviation occurs.

[0008] As an improvement, when the positioning pin is simultaneously inserted into the outer crank arm positioning hole and the trip positioning hole, the circuit breaker is in the tripped state; when the positioning pin is simultaneously inserted into the outer crank arm positioning hole and the trip positioning hole, the circuit breaker is in the tripped state.

[0009] As an improvement, the positions of the opening positioning hole, closing positioning hole, and rigid contact point positioning hole on the positioning device correspond to the preset stroke and overtravel requirements of the vacuum interrupter.

[0010] As an improvement, the sensor is housed inside the support frame, the outer surface of the sensor is covered with a protective pad, and at least one bolt is threaded through the support frame, with the end of the bolt abutting against the protective pad.

[0011] As an improvement, when the drive shaft rotates under the drive of the outer crank arm, it synchronously drives the sensor connected to the drive shaft through the connecting bolt and the connecting joint to rotate.

[0012] (III) Beneficial Effects The advantages of this invention compared to the prior art are: 1. By fixing a positioning device with opening, closing, and rigid-close point positioning holes on the transmission box, and opening an outer crank arm positioning hole on the outer crank arm, and using positioning pins simultaneously passing through the corresponding positioning holes, a rigid and intuitive positioning reference is provided for the assembly of the circuit breaker. Operators can accurately determine the positions of the rigid-close, opening, and closing points of the vacuum interrupter without relying on visual inspection or indirect measurement. This effectively eliminates the inconsistency between internal and external states caused by machining errors and accumulated errors in manual assembly, ensuring the accuracy of subsequent mechanical characteristic test data and the consistency of product assembly quality.

[0013] 2. By setting up a support frame that is securely connected to the transmission box, and housing the sensor inside the support frame, the sensor is rigidly connected to the transmission shaft using connecting bolts and connectors, allowing the sensor to rotate synchronously with the transmission shaft. This structure effectively overcomes the impact of the severe vibration during the opening and closing of the 126kV vacuum circuit breaker on the stability of the sensor, avoids the problem of measurement angle distortion caused by sensor shaking or slippage, and ensures the authenticity and reliability of the mechanical characteristic parameter test results. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the transmission box structure of the present invention.

[0015] Figure 2 This is an assembly structure diagram of the transmission box of the present invention.

[0016] Figure 3 This is a diagram of the sensor fixing structure of the present invention.

[0017] Figure 4 This is a structural diagram of the outer crank arm of the present invention.

[0018] As shown in the figure: 1. Transmission box; 1-1. Positioning device; 1-2. Opening positioning hole; 1-3. Engagement point positioning hole; 1-4. Closing positioning hole; 2. Adjusting joint; 3. Positioning pin; 4. Outer crank arm; 4-1. Outer crank arm positioning hole; 5. Transmission shaft; 6. Connecting bolt; 7. Connecting joint; 8. Support frame; 8-1. Bolt; 9. Sensor; 10. Protective pad. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0020] This embodiment provides a 126kV vacuum circuit breaker assembly positioning and sensor 9 positioning device 1-1, which integrates assembly positioning function and sensor 9 fixing function into one device.

[0021] The transmission box 1, serving as the basic load-bearing component of this device, has a positioning device 1-1 fixed on its shell surface. This positioning device 1-1 is a plate-like structure with three positioning holes: a tripping positioning hole 1-2, a closing positioning hole 1-4, and a snap-on positioning hole 1-3. The positions of these three positioning holes on the positioning device 1-1 are precisely calculated and determined based on the preset stroke and overtravel requirements of the vacuum interrupter, corresponding to the angular positions of the outer crank arm 4 when the circuit breaker is in the tripping, closing, and snap-on positions, respectively.

[0022] A drive shaft 5 is installed inside the transmission housing 1, with both ends extending out of the housing. An outer crank arm 4 is inserted into and fixed to one end of the drive shaft 5. The outer crank arm 4 is circumferentially fixed to the drive shaft 5, allowing the drive shaft 5 to rotate synchronously when the outer crank arm 4 rotates. The outer crank arm 4 has a positioning hole, the position of which matches the positioning holes on the positioning device 1-1. An adjusting joint 2 is connected to the other end of the drive shaft 5. The end of the adjusting joint 2 facing away from the drive shaft 5 is used to connect to transmission components such as an insulating pull rod, and then to the moving contact end of the vacuum interrupter.

[0023] When assembling a circuit breaker, the first step is to determine the rigid contact point position of the vacuum interrupter. The operator rotates the outer crank arm 4, causing the drive shaft 5 and adjusting joint 2 to rotate, which in turn drives the moving contact inside the vacuum interrupter towards the stationary contact via the insulating pull rod. When the moving and stationary contacts inside the vacuum interrupter are just in contact, the positioning hole on the outer crank arm 4 should be aligned with the rigid contact point positioning hole 1-3 on the positioning device 1-1. At this point, the positioning pin 3 is simultaneously inserted into both the positioning hole on the outer crank arm 4 and the rigid contact point positioning hole 1-3, thus locking the transmission system at the rigid contact point position. If the positioning hole on the outer crank arm 4 and the rigid contact point positioning hole 1-3 cannot be aligned due to machining tolerances or accumulated assembly errors, no parts need to be disassembled. Simply rotating the adjusting joint 2 changes the overall length of the transmission chain, thereby fine-tuning the relative position of the moving and stationary contacts of the vacuum interrupter until the positioning pin 3 can smoothly pass through both holes, eliminating the deviation.

[0024] After completing the rigid positioning, continue rotating the outer crank arm 4 until the positioning pin 3 is simultaneously inserted into both the positioning hole and the opening positioning hole 1-2 on the outer crank arm 4. At this point, the circuit breaker is in the opening state, and the moving and stationary contacts inside the vacuum interrupter are separated to the rated opening distance. Similarly, when the positioning pin 3 is simultaneously inserted into both the positioning hole and the closing positioning hole 1-4 on the outer crank arm 4, the circuit breaker is in the closing state, and the moving and stationary contacts are in complete contact and maintain the rated contact pressure. Through the above rigid positioning method, the internal state of the vacuum interrupter and the indicated position of the external transmission system are precisely correlated, fundamentally avoiding assembly deviations caused by visual inspection or indirect measurement.

[0025] To achieve accurate measurement of the mechanical characteristics of the circuit breaker, this device also integrates a sensor 9 fixing structure. A support frame 8 is fitted around the drive shaft 5. The main body of the support frame 8 is cylindrical, and its bottom is fixedly connected to the housing of the transmission box 1 by fasteners. The interior of the support frame 8 forms an accommodating space for accommodating the sensor 9 used for mechanical characteristic testing.

[0026] A connecting bolt 6 is fastened to one end of the drive shaft 5 near the inside of the support frame 8. The connecting bolt 6 is secured to the end of the drive shaft 5 via a threaded structure. A connecting joint 7 is provided between the sensor 9 and the connecting bolt 6. One end of the connecting joint 7 is fastened to the connecting bolt 6 with a screw, and the other end is fastened to the input shaft of the sensor 9 with a screw. Through the above connection structure, a rigid coupling relationship is formed between the sensor 9 and the drive shaft 5, and the rotational motion of the drive shaft 5 can be transmitted to the input shaft of the sensor 9 without gaps.

[0027] The main body of sensor 9 is housed within the internal space of support frame 8, and its outer surface is covered with a protective pad 10. At least one bolt 8-1 is threaded radially through the side wall of support frame 8, with the tip of bolt 8-1 abutting against the surface of protective pad 10. By rotating bolt 8-1 to adjust its insertion depth, the radial dimension of the internal clamping space of support frame 8 can be changed, thereby accommodating and securing sensors 9 of different shapes and sizes. The protective pad 10 effectively prevents scratches or indentations that might occur if the tip of bolt 8-1 directly contacts the surface of sensor 9.

[0028] During mechanical characteristic testing, the circuit breaker performs opening or closing actions. The outer crank arm 4 rotates under the drive of the operating mechanism, causing the drive shaft 5 to rotate synchronously. The rotational motion of the drive shaft 5 is transmitted to the vacuum interrupter chamber via the adjusting joint 2 and the insulating pull rod, driving the moving contact to complete the opening and closing actions. Simultaneously, the rotational motion of the drive shaft 5 is transmitted synchronously to the input shaft of the sensor 9 via the connecting bolt 6 and the connecting joint 7. The sensor 9 converts the angular displacement signal of the drive shaft 5 into an electrical signal and outputs it to the testing instrument, thereby recording the circuit breaker's opening and closing time, stroke, speed, and other mechanical characteristic parameters in real time.

[0029] Because the sensor 9 and the drive shaft 5 are rigidly connected, and the sensor 9 body is firmly clamped in the support frame 8 fixed to the transmission box 1 by bolts 8-1, even under the condition of severe mechanical vibration generated during the opening and closing of the 126kV vacuum circuit breaker, the sensor 9 and the drive shaft 5 can still maintain stable coaxiality and connection rigidity, and there will be no relative shaking or slippage. This ensures that the output signal of the sensor 9 truly reflects the actual movement state of the drive shaft 5, avoids the problem of measurement data distortion caused by unstable fixing, and significantly improves the accuracy and repeatability of mechanical characteristic testing.

[0030] All standard parts used in this invention can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art, and the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here.

[0031] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the invention, such designs should fall within the protection scope of the present invention.

Claims

1. A 126kV vacuum circuit breaker assembly positioning and sensor positioning device, characterized in that: It includes a transmission box (1), on which a positioning device (1-1) is fixedly provided. The positioning device (1-1) is provided with a tripping positioning hole (1-2), a closing positioning hole (1-4) and a snap-fit ​​point positioning hole (1-3). A drive shaft (5) is installed inside the transmission box (1). An outer crank arm (4) is installed and fixed at one end of the drive shaft (5). An adjustment joint (2) for connecting a vacuum interrupter is connected to the other end of the drive shaft (5). The outer crank arm (4) is provided with an outer crank arm positioning hole (4-1), and the positioning pin (3) can be selectively inserted into either the outer crank arm positioning hole (4-1) or the positioning device (1-1) at the same time. The drive shaft (5) is fitted with a support frame (8), which is fastened to the transmission box (1); A connecting bolt (6) is fastened to the drive shaft (5), and a connecting joint (7) is provided between the connecting bolt (6) and the sensor (9) used to detect mechanical characteristics. The sensor (9) rotates synchronously with the drive shaft (5) during the opening and closing of the brake.

2. The 126 kV vacuum circuit breaker assembly positioning and sensor positioning device of claim 1, wherein: When the positioning pin (3) is simultaneously inserted into the positioning hole (4-1) of the outer crank arm and the positioning hole (1-3) of the rigid engagement point, the vacuum interrupter is in the rigid engagement position; the adjusting joint (2) is used to rotate and adjust to eliminate the deviation when assembly deviation occurs.

3. The 126 kV vacuum circuit breaker assembly positioning and sensor positioning device of claim 1, wherein: When the positioning pin (3) is simultaneously inserted into the outer crank arm positioning hole (4-1) and the opening positioning hole (1-2), the circuit breaker is in the opening state; when the positioning pin (3) is simultaneously inserted into the outer crank arm positioning hole (4-1) and the closing positioning hole (1-4), the circuit breaker is in the closing state.

4. The 126 kV vacuum circuit breaker assembly positioning and sensor positioning device of claim 1, wherein: The positions of the opening positioning hole (1-2), closing positioning hole (1-4), and rigid closing point positioning hole (1-3) on the positioning device (1-1) correspond to the preset stroke and overtravel requirements of the vacuum interrupter.

5. The 126kV vacuum circuit breaker assembly positioning and sensor positioning device according to claim 1, characterized in that: The sensor (9) is housed inside the support frame (8), and the outer surface of the sensor (9) is covered with a protective pad (10). At least one bolt (8-1) is threaded through the support frame (8), and the end of the bolt (8-1) abuts against the protective pad (10).

6. The 126kV vacuum circuit breaker assembly positioning and sensor positioning device according to claim 1, characterized in that: When the drive shaft (5) rotates under the drive of the outer crank arm (4), it synchronously drives the sensor (9) connected to the drive shaft (5) through the connecting bolt (6) and the connecting joint (7) to rotate.

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