Circuit breaker operating mechanism test tool

Abstract

The present invention provides a circuit breaker operating mechanism test fixture. The circuit breaker operating mechanism test fixture comprises a frame, on which a main shaft is rotatably mounted, the main shaft is connected to a three-phase pull rod assembly simulating a three-phase insulating pull rod of a circuit breaker through a crank arm structure, and is connected to a load assembly simulating a three-phase vacuum load of a circuit breaker through the three-phase pull rod assembly, and an operating mechanism fixed installation structure is also provided on the frame, a transmission crank arm for connecting to an output end of the operating mechanism to be tested is axially slidably mounted on the main shaft, and the transmission crank arm is connected to the main shaft to prevent rotation. The test fixture simulates the three-phase transmission pull rod and the three-phase vacuum switch of the circuit breaker through the three-phase pull rod assembly and the three-phase vacuum load assembly respectively, when testing the operating mechanism, not only ensures that the test results are accurate and true, but also avoids the problems of the existing use of circuit breakers to simulate the operating mechanism, such as the circuit breaker is easily damaged, cannot be used multiple times, and the test cost is high.

Description

Technical Field

[0001] The invention relates to a testing device, in particular to a testing tool for a circuit breaker operating mechanism. Background Art

[0002] As an electrical device that controls the opening and closing of circuits, circuit breakers are of various types and are applicable to more and more occasions. For example, the ZW20 disconnector disclosed in the Chinese invention patent with the authorization announcement number CN207199523U is a circuit breaker suitable for outdoor overhead distribution lines. When using this circuit breaker, it is necessary to install an adaptive operating mechanism, and before installing the operating mechanism, it is often necessary to test its mechanical life. The traditional testing method is often to assemble a circuit breaker, connect the operating mechanism to the circuit breaker and perform a large number of opening and closing operations. However, this assembled circuit breaker is only used for testing, and after the test is completed, it often causes varying degrees of damage and cannot be used. When the next test is carried out, it is often necessary to reassemble a new circuit breaker, which makes the testing cost of the operating mechanism very high. Summary of the invention

[0003] The object of the present invention is to provide a circuit breaker operating mechanism testing tool, which is used to solve the problem that the operating mechanism is tested through the circuit breaker without a rotating test tool, resulting in high testing costs.

[0004] The circuit breaker operating mechanism test fixture of the present invention comprises a frame, on which a main rotating shaft is rotatably mounted, the main rotating shaft is connected to a three-phase pull rod assembly simulating a three-phase insulating pull rod of a circuit breaker through a crank arm structure, and is connected to a load assembly simulating a three-phase vacuum load of a circuit breaker through the three-phase pull rod assembly, the frame is also provided with an operating mechanism fixed installation structure, a transmission crank arm for connecting to the output end of the operating mechanism to be tested is axially slidably mounted on the main rotating shaft, and the transmission crank arm is connected to the main rotating shaft for rotation prevention; the load assembly comprises a spring pull rod, a load overtravel spring, a pull rod and a pull rod sleeve welding assembly, one end of the spring pull rod extends into the pull rod sleeve welding assembly, the spring pull rod is provided with a pressure plate that is pressed against the load overtravel spring, and the other end of the load overtravel spring is pressed against the load overtravel spring. One end is welded to the pull rod sleeve; the load assembly includes a three-phase spring assembly with one end respectively fixed relative to the frame body, the three-phase spring assembly is correspondingly arranged on the lower side of the three-phase pull rod assembly, and the three-phase spring assembly and the three-phase pull rod assembly are respectively hinged by connecting arms with two connecting ends to form a seesaw structure; the fixed installation structure of the operating mechanism is a two-stage stepped shaft arranged on the side wall of the frame, the large diameter section of the two-stage stepped shaft is close to the side wall of the frame, and the small diameter section of the stepped shaft constitutes an insertion section for the operating mechanism to be inserted, the step surface of the stepped shaft constitutes a positioning surface for positioning the operating mechanism, and a locking stud is extended outward at the end of the small diameter section, and the operating mechanism can be locked and fixed by the locking nut on the locking stud.

[0005] The circuit breaker operating mechanism test tool of the present invention simulates the three-phase driving rod and the three-phase vacuum switch of the circuit breaker respectively through the three-phase pull rod assembly and the three-phase vacuum load assembly. When testing the operating mechanism, it not only ensures that the test result is accurate and true, but also avoids the problems of the circuit breaker being easily damaged, unable to be used multiple times, and high testing cost in the existing simulation test of the operating mechanism using the circuit breaker. Such a setting can effectively utilize space and make the structure of the entire tool more compact.

[0006] Of course, preferably, the length of the three-phase tie rod assembly is adjustable to facilitate the connection between the main shaft and the vacuum load assembly.

[0007] On this basis, the frame can be set as a rectangular box structure, the three-phase tie rod assembly and the three-phase load assembly are located in the rectangular frame, the main shaft is rotatably assembled on the two opposite side walls of the rectangular frame, the transmission crank arm is installed on one end of the main shaft extending out of the frame side wall, and the operating mechanism fixed installation structure is set on the frame side wall near the transmission crank arm. Placing the three-phase tie rod assembly and the three-phase load assembly in the frame avoids interference with other moving parts during the test.

[0008] Furthermore, the end of the main shaft away from the transmission crank arm is connected to a buffer spring simulating the buffer component of the main shaft of the circuit breaker through the crank arm structure. The buffer spring is provided to more realistically simulate the stress state and motion state of the circuit breaker during opening and closing operations, making the inspection result more realistic.

[0009] In order to further increase the service life, the main shaft is rotatably assembled on the side wall of the frame through bearings.

[0010] In the specific structural design, the fixed installation structure of the operating mechanism can be a hanging structure.

[0011] In order to extend the service life of the main rotating shaft, the transmission crank arm includes a main crank arm and a sleeve arranged axially parallel to the main crank arm. The main crank arm is non-rotatably connected to the main rotating shaft through a latch pin, the sleeve is fixedly connected to the main crank arm, and the sleeve is provided with an expansion pin radially inserted into the main rotating shaft. The expansion pin can ensure the non-rotating connection between the main rotating shaft and the main crank arm when the latch pin is severely worn. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of an embodiment of a circuit breaker operating mechanism testing tool of the present invention;

[0013] Figure 2 for Figure 1 The structural diagram of the middle transmission crank arm;

[0014] Figure 3 A schematic diagram showing the structure of the connection between the tie rod assembly and the load assembly;

[0015] Figure 4 This is a schematic diagram of the operating mechanism being tested using the test fixture. DETAILED DESCRIPTION

[0016] The embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0017] A specific embodiment of the circuit breaker operating mechanism testing tool of the present invention is as follows: Figures 1 to 4 As shown, it includes a frame 1, which is a rectangular box-type structure. Two opposite side walls of the rectangular box-type structure form an internal space of the frame. A three-phase pull rod assembly 3 simulating a three-phase insulating pull rod of a circuit breaker and a three-phase vacuum load 5 corresponding to the three-phase pull rod assembly and simulating a three-phase vacuum switch of a circuit breaker are installed in the internal space.

[0018] Specifically, the main shaft 4 is rotatably mounted on the two opposite side walls of the rectangular frame through the bearing 2, and the main shaft 4 is respectively connected to the three-phase tie rod assembly 3 through the crank arm structure 10. A baffle welding 13 is fixedly arranged inside the frame, and a tie rod shaft 12 is also mounted on the two opposite side walls, and a three-phase connecting crank arm 11 is mounted on the tie rod shaft 12, wherein the three-phase connecting crank arm 11 can rotate freely around the tie rod shaft 12.

[0019] One connection end of the connecting crank arm 11 is connected to a three-phase pull rod assembly 3 simulating a three-phase insulating pull rod of a circuit breaker. The three-phase pull rod assembly 3 includes an adjusting screw rod 31, an insulating pull rod 32, and a pull rod overtravel spring 33. One end of the adjusting screw rod 31 is hinged to the connecting crank arm 11, and the pull rod overtravel spring 33 is sleeved on the insulating pull rod 32. The other end of the insulating pull rod is sleeved with a spring seat. The insulating pull rod is hinged to the crank arm structure 10 through a long hole at one end of the insulating pull rod, and the insulating pull rod 32 is threadedly connected to the adjusting screw rod 31.

[0020] The vacuum load 5 includes a spring pull rod 51, a load overtravel spring 52, a pull rod sleeve weldment 53 and a pull rod 54. One end of the pull rod 54 is hinged to the baffle weldment 13, one end of the spring pull rod 51 is hinged to the connecting arm 11, and the other end extends into the pull rod sleeve weldment 53. A pressure plate is provided on the spring pull rod 51 to press against the load overtravel spring 52, and the other end of the load overtravel spring 52 is against the pull rod sleeve weldment 53.

[0021] During operation, the main shaft 4 drives the three-phase pull rod assembly 3 to move through the crank arm structure 10 , and then drives the three-phase vacuum load 5 to move through the connecting crank arm 11 , thereby compressing the load overtravel spring 52 .

[0022] The two ends of the main rotating shaft 4 extend out of two opposite side walls respectively, and a buffer spring 6 simulating the buffer component of the main rotating shaft of the circuit breaker is connected to one end through a crank arm structure, and a transmission crank arm 7 is installed on the other end. The transmission crank arm 7 is slidably installed on the main rotating shaft along the axial direction of the main rotating shaft 4. A fixed installation structure for fixing the circuit breaker operating mechanism is provided on the side wall of the rectangular frame close to the transmission crank arm 7.

[0023] In this embodiment, the fixed installation structure of the operating mechanism fixes the operating mechanism by hanging. Specifically, the fixed installation structure is a two-stage stepped shaft 8 arranged on the side wall of the frame, the large diameter section of the two-stage stepped shaft 8 is close to the side wall of the frame, the small diameter section of the stepped shaft constitutes an insertion section for inserting the operating mechanism, the step surface of the stepped shaft constitutes a positioning surface for positioning the operating mechanism, and a locking stud extends outward from the end of the small diameter section, and the operating mechanism can be locked and fixed by a locking nut on the locking stud.

[0024] like Figure 2 As shown, the transmission crank arm 7 includes a main crank arm 70 and a sleeve 71 axially arranged in parallel with the main crank arm 70. The main crank arm 70 is non-rotatably connected to the main rotating shaft 4 through a latch pin, and the sleeve 71 is fixedly connected to the main crank arm 70. An expansion pin radially inserted into the main rotating shaft 4 is provided on the sleeve 71. The expansion pin can ensure the non-rotatable connection between the main rotating shaft and the main crank arm when the latch pin is severely worn.

[0025] When the tool is in use, the operating mechanism is fixedly installed on the rectangular frame through the fixed installation structure, and then the output end 9 of the operating mechanism is connected to the transmission crank arm 7. When the operating mechanism is energized, it can drive the main shaft 4 to reciprocate and drive the three-phase pull rod assembly 3 and the three-phase vacuum load 5 to simulate the movement state of the insulating pull rod and the vacuum break during the opening and closing actions of the circuit breaker. The mechanical life of the operating mechanism is tested through a large number of opening and closing simulation actions.

[0026] Of course, the circuit breaker operating mechanism test fixture of the present invention is not limited to the above-mentioned embodiments. In other embodiments, the frame body can be a hollow frame structure; the operating mechanism fixed installation structure can be a bolt connection hole set on the frame, and is fixedly connected to the operating mechanism through the bolt connection hole; or it can be a fixed bottom plate extending horizontally on the side wall, and the operating mechanism is installed on the plate surface of the fixed bottom plate; the main shaft can be rotatably assembled on the frame body through a shaft sleeve; the transmission crank arm can also be connected to the main shaft to achieve a non-rotating connection through a profile fit or a keyway fit.

Claims

1. A circuit breaker operating mechanism testing tool, characterized in that: The invention comprises a frame body, on which a main rotating shaft is rotatably mounted, the main rotating shaft is connected to a three-phase pull rod assembly simulating a three-phase insulating pull rod of a circuit breaker through a crank arm structure, and is connected to a load assembly simulating a three-phase vacuum load of a circuit breaker through the three-phase pull rod assembly, the frame body is also provided with an operating mechanism fixed installation structure, a transmission crank arm for connecting to the output end of the operating mechanism to be tested is axially slidably mounted on the main rotating shaft, and the transmission crank arm is connected to the main rotating shaft for rotation prevention; the load assembly comprises a spring pull rod, a load overtravel spring, a pull rod and a pull rod sleeve weldment, one end of the spring pull rod extends into the pull rod sleeve weldment, a pressure plate which is pressed against the load overtravel spring is arranged on the spring pull rod, and the other end of the load overtravel spring is welded to the pull rod sleeve Offset against each other; the load assembly includes a three-phase spring assembly with one end respectively fixed relative to the frame body, the three-phase spring assembly is correspondingly arranged on the lower side of the three-phase pull rod assembly, the three-phase spring assembly and the three-phase pull rod assembly are respectively hinged by a connecting arm with two connecting ends to form a seesaw structure; the fixed installation structure of the operating mechanism is a two-stage stepped shaft arranged on the side wall of the frame, the large diameter section of the two-stage stepped shaft is close to the side wall of the frame, the small diameter section of the stepped shaft constitutes an insertion section for the operating mechanism to be inserted, the step surface of the stepped shaft constitutes a positioning surface for positioning the operating mechanism, and a locking stud is extended outward at the end of the small diameter section, and the operating mechanism can be locked and fixed by the locking nut on the locking stud.

2. The circuit breaker operating mechanism testing tool according to claim 1, characterized in that: The length of the three-phase tie rod assembly is adjustable.

3. The circuit breaker operating mechanism testing tool according to claim 1, characterized in that: The frame is a rectangular box-type structure, the three-phase pull rod assembly and the three-phase load assembly are located in the rectangular frame, the main shaft is rotatably assembled on two opposite side walls of the rectangular frame, the transmission crank arm is installed on one end of the main shaft extending out of the frame side wall, and the operating mechanism fixed installation structure is arranged on the frame side wall close to the transmission crank arm.

4. The circuit breaker operating mechanism testing tool according to claim 3, characterized in that: One end of the main rotating shaft away from the transmission crank arm is connected with a buffer spring simulating a buffer component of the main rotating shaft of the circuit breaker through a crank arm structure.

5. The circuit breaker operating mechanism testing tool according to claim 3 or 4, characterized in that: The main shaft is rotatably assembled on the side wall of the frame through bearings.

6. The circuit breaker operating mechanism testing tool according to claim 3 or 4, characterized in that: The operating mechanism fixed installation structure is installed on the side wall of the frame by hanging.

7. The circuit breaker operating mechanism testing tool according to claim 3 or 4, characterized in that: The transmission crank arm comprises a main crank arm and a shaft sleeve axially arranged in parallel with the main crank arm. The main crank arm is connected to the main rotating shaft through a latch to prevent rotation. The shaft sleeve is fixedly connected to the main crank arm. The shaft sleeve is provided with an expansion pin radially inserted with the main rotating shaft.

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