A test tool and its use

Abstract

The present invention relates to the field of circuit breakers, and specifically to a test fixture and its use. A test fixture comprises: a rotating shaft; a driving member, the driving member drives the rotating shaft to deflect; an energy storage mechanism, the energy storage mechanism stores energy with the deflection of the rotating shaft, and when the rotating shaft deflects past a critical point, the energy storage mechanism releases energy to push the rotating shaft to deflect rapidly to a test position. A use of a test fixture, the test fixture is used to test a circuit breaker, and the main shaft of the circuit breaker is connected to the rotating shaft and rotates with it. When the test fixture of the present invention is used for circuit breaker testing, the driving member is used to drive the rotating shaft to deflect, and the energy storage mechanism can release energy to push the rotating shaft to deflect rapidly to a test position, that is, drive the circuit breaker to close and open quickly, so as to facilitate the testing of the circuit breaker. It solves the technical problem that the circuit breaker is tested by manual closing and opening in the prior art, which is inefficient and low in accuracy.

Description

Technical Field

[0001] The present invention relates to the field of circuit breakers, and in particular to a testing tool and applications thereof. Background Art

[0002] With the development of circuit breaker products, circuit breakers are increasingly used in industries such as aerospace and shipbuilding. In order to ensure the quality and reliability of circuit breakers before leaving the factory, it is necessary to test whether the circuit breakers can normally open and close when a large current is passed through them. High current testing equipment is essential equipment for various industries that require high current places during electrical debugging. It can be used to test the opening and closing of circuit breakers, thereby judging the quality and reliability of large circuit breakers.

[0003] In existing technology, testing the normal opening and closing of large circuit breakers is typically done manually. This method is subject to significant errors, poses safety risks, and is difficult to meet the higher accuracy testing requirements of products. Furthermore, manual testing is inefficient. Furthermore, some high-current testing equipment currently on the market is difficult to fully automate, has complex structures, and is inconvenient to operate. Summary of the Invention

[0004] In order to solve the technical problem that circuit breakers are tested manually by closing and opening them in the prior art, which is inefficient and inaccurate, the present invention proposes a test fixture and its use to solve the above technical problems. The technical solution of the present invention is as follows:

[0005] A test fixture comprises: a rotating shaft; a driving member, which drives the rotating shaft to deflect; and an energy storage mechanism, which stores energy as the rotating shaft deflects. When the rotating shaft deflects past a critical point, the energy storage mechanism releases energy to push the rotating shaft to quickly deflect to a test position.

[0006] The test fixture of the present invention, when used for circuit breaker testing, uses a driving member to drive the rotating shaft to deflect, and the energy storage mechanism can release energy to push the rotating shaft to quickly deflect to the test position, that is, to drive the circuit breaker to close and open quickly, so as to facilitate the testing of the circuit breaker, replacing the manual operation of closing and opening in the prior art, with high efficiency and accuracy.

[0007] According to an embodiment of the present invention, the driving member drives the rotating shaft to reciprocate and deflect through the critical point. The rotating shaft has two test positions, and the two test positions are respectively located on both sides of the critical point in the circumferential direction.

[0008] According to one embodiment of the present invention, the driving member drives the rotating shaft to deflect via the transmission assembly.

[0009] According to one embodiment of the present invention, the transmission assembly includes a swinging member and a toggle member, the swinging member is hingedly assembled, the toggle member is rotatably assembled on the rotating shaft, the toggle member has two toggle parts arranged at intervals, the free end of the swinging member extends between the two toggle parts, and the swinging member swings and toggle the toggle part under the drive of the driving member to drive the rotating shaft to deflect.

[0010] According to one embodiment of the present invention, the driving member drives the swinging member to swing back and forth through the rotating member, the rotating member performs circular motion under the drive of the driving member, the outer end of the rotating member is movably connected to the swinging member, and the rotating member drives the swinging member to swing back and forth.

[0011] According to one embodiment of the present invention, one end of the energy storage mechanism is hingedly assembled, and the other end of the energy storage mechanism is hingedly connected to the rotating shaft. The rotating shaft deflects and compresses the length of the energy storage mechanism so that the energy storage mechanism stores energy.

[0012] According to one embodiment of the present invention, the energy storage mechanism includes a telescopic rod assembly and an energy storage component. The length of the telescopic rod assembly is variable. The energy storage component is mounted on the telescopic rod assembly. The length of the energy storage component changes with the length of the telescopic rod assembly.

[0013] According to one embodiment of the present invention, a following member is assembled on the rotating shaft, a connecting portion extends from a side of the following member close to the energy storage mechanism, and the energy storage mechanism is hinged to the connecting portion of the following member.

[0014] According to one embodiment of the present invention, the follower member further has limiting portions extending on both sides of the connecting portion.

[0015] A use of a testing tool, wherein the testing tool is used for testing a circuit breaker, wherein a main shaft of the circuit breaker is connected to the rotating shaft and rotates therewith.

[0016] Based on the above technical solution, the technical effects that can be achieved by the present invention are:

[0017] 1. The test fixture of the present invention, when used for circuit breaker testing, employs a drive member to drive the deflection of a rotating shaft. The energy storage mechanism releases energy to propel the rotating shaft rapidly from a critical point to a test position, thereby rapidly closing and opening the circuit breaker, thereby facilitating circuit breaker testing and replacing the manual closing and opening operations in the prior art. This is highly efficient and accurate. Two test positions are provided, one on each circumferential side of the critical point. The rotating shaft rotates forward and reverse to the critical point, then rapidly moves to the two test positions under the action of energy released by the energy storage mechanism. The two test positions can be set to the open and closed states, respectively. This allows for rapid closing and opening of the circuit breaker, facilitating testing.

[0018] 2. In the test fixture of the present invention, the driving member drives the rotating shaft to deflect through the transmission assembly, and adopts a toggle drive mode. There is no direct or indirect connection between the driving member and the rotating shaft. The rotating shaft does not need to follow the driving member to make a complete circular motion, but only needs to deflect within the required range. When the energy storage mechanism releases energy to push the rotating shaft to deflect rapidly to the test position, the rotating shaft will not interfere with the state of the driving member. The structure of the transmission assembly is further set. The driving member drives the swinging member to reciprocate and deflect through the rotating member. The swinging member toggles the toggle member to deflect, and the toggle member drives the rotating shaft to deflect. When the driving member drives the rotating member to rotate, there is no need to set the rotation direction and rotation range of the driving member. The rotating shaft can be driven to deflect back and forth within a specific range, which simplifies the structure and effectively meets the driving requirements.

[0019] 3. In the test fixture of the present invention, the energy storage mechanism is flexible and retractable in length. The energy storage mechanism is hingedly assembled. When the axis of the energy storage mechanism intersects the axis of the rotating shaft, the energy storage mechanism is at its shortest length, the energy storage mechanism is in a maximum energy storage state, and the rotating shaft is at a critical point. As the rotating shaft continues to deflect under the drive element, the energy storage mechanism rapidly releases energy, driving the rotating shaft to rapidly deflect to the testing position. The axis of the energy storage mechanism and the axis of the rotating shaft are staggered and do not intersect.

[0020] 4. The test fixture of the present invention has a rotating member mounted on the rotating shaft, an extended connecting portion of the rotating member being hingedly connected to the energy storage mechanism, and a limit portion formed on the rotating member. The limit portion abuts against the limit structure to limit the maximum deflection range of the rotating shaft, thereby preventing the rotating shaft from exceeding the required range.

[0021] 5. The test fixture of the present invention can be used to test circuit breakers. Specifically, the main shaft of the circuit breaker can be set to be connected to the rotating shaft and rotate with it. The rotating shaft can drive the main shaft to move to two test positions to realize the closing and opening of the circuit breaker, so as to facilitate the testing of the circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic structural diagram of the test fixture of the present invention when applied to circuit breaker testing;

[0023] Figure 2 It is a structural schematic diagram of the test tool of the present invention;

[0024] Figure 3 for Figure 2 A magnified view of part A;

[0025] Figure 4 It is a structural diagram of the cooperation between the rotating shaft and the energy storage mechanism;

[0026] Figure 5 It is a structural diagram of the assembly structure on the rotating shaft;

[0027] Figure 6 It is a structural diagram of the energy storage mechanism;

[0028] In the figure: 1-rotating shaft; 11-rotating member; 111-connecting part; 112-limiting part; 2-driving member; 21-driving shaft; 3-energy storage mechanism; 31-sleeve; 311-first limiting seat; 32-sliding rod; 33-energy storage member; 34-resetting member; 35-connecting seat; 36-second limiting seat; 37-hinge shaft; 4-transmission assembly; 41-rotating member; 411-transmission end; 42-swinging member; 421-long hole; 43-toggle member; 431-toggle part; 5-circuit breaker; 51-main shaft; 6-frame; 61-first support; 62-second support; 621-bracket; 622-first limiting member; 623-second limiting member. DETAILED DESCRIPTION

[0029] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0031] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments can have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, and therefore, once an item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0032] In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0033] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0034] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0035] like Figure 1-6 As shown, this embodiment provides a test fixture for testing a circuit breaker 5. The test fixture includes a rotating shaft 1 and a driving member 2. The rotating shaft 1 is connected to the main shaft 51 of the circuit breaker 5 for rotation. The driving member 2 drives the rotating shaft 1 to deflect. The rotating shaft 1 drives the main shaft 51 to rotate to a test position to test the circuit breaker 5.

[0036] The rotating shaft 1 is rotatably assembled, and one end of the rotating shaft 1 is driven by the driving member 2 to reciprocate within a certain angle range. The other end of the rotating shaft 1 is connected to the main shaft 51 of the circuit breaker 5 through a coupling. The rotating shaft 1 and the main shaft 51 are located on the same axis, and the rotating shaft 1 and the main shaft 51 deflect synchronously.

[0037] As a preferred technical solution of this embodiment, the driving member 2 drives the rotating shaft 1 to deflect back and forth through the transmission assembly 4. The transmission assembly 4 includes a rotating member 41, a swinging member 42, and a toggle member 43. The rotating member 41 is arranged on the driving shaft 21 of the driving member 2. The outer end of the rotating member 41 performs a circular motion under the drive of the driving member 2; one end of the swinging member 42 is hingedly assembled, and the outer end of the rotating member 41 is movably assembled with the swinging member 42. When the rotating member 41 performs a circular motion, the rotating member 41 can drive the swinging member 42 to swing back and forth within a certain angle range; the toggle member 43 is assembled on the rotating shaft 1 so as to rotate with it. The other end of the swinging member 42 can rotate to toggle the toggle member 43 to deflect, and the toggle member 43 drives the rotating shaft 1 to deflect. The driving member 2 can be optionally but not limited to a motor.

[0038] Specifically, the rotating member 41 can be bent, preferably L-shaped, one end of the rotating member 41 is connected to the driving shaft 21 of the driving member 2, and the other end of the rotating member 41 is a transmission end 411 parallel to the axis of the rotating shaft 1, and the transmission end 411 is movably matched with the swinging member 42; one end of the swinging member 42 is hingedly assembled, and the other end of the swinging member 42 is used to toggle the toggle member 43. A long hole 421 is opened on the swinging member 42, and the transmission end 411 extends into the long hole 421 and can slide in the long hole 421. When the rotating member 41 rotates under the drive of the driving member 2, the transmission end 411 of the rotating member 41 slides back and forth in the long hole 421, which can drive the swinging member 42 to swing back and forth on the vertical plane where the hinge point is located. The toggle member 43 is rotatably mounted on the rotating shaft 1. Two toggle portions 431 with a clearance fit extend from the toggle member 43. The end of the swinging member 42 extends between the two toggle portions 431. When the swinging member 42 oscillates back and forth, it can alternately toggle the two toggle portions 431 to drive the rotating shaft 1 to deflect in two directions. Preferably, in order to reduce the force between the swinging member 42 and the toggle member 43 and prevent damage to the components, the end of the swinging member 42 used to toggle the toggle member 43 is equipped with a rotating wheel, and the two toggle portions 431 are also equipped with rotating wheels. This ensures that the friction generated when the two contact is rolling friction, thereby reducing damage to the components. By setting up the transmission assembly 4, the toggle-driven rotation of the rotating shaft 1 can be used to cause the rotating shaft 1 to oscillate back and forth within a certain angle range without having to make a complete circular motion. In addition, the rotating shaft 1 can have a certain deflection range relative to the driving member 2, thereby avoiding the problem of interference caused by the connection drive between the rotating shaft 1 and the driving member 2.

[0039] As a preferred technical solution of this embodiment, the test fixture also includes an energy storage mechanism 3, which can store energy as the rotating shaft 1 deflects. When the rotating shaft 1 deflects past the critical point, the energy storage mechanism 3 can release energy to push the rotating shaft 1 to quickly deflect to the test position. Specifically, one end of the energy storage mechanism 3 is hingedly assembled, and the other end of the energy storage mechanism 3 is hinged to the rotating shaft 1. The length of the energy storage mechanism 3 is variable. When the rotating shaft 1 deflects under the drive of the driving member 2, the rotating shaft 1 can deflect and compress the length of the energy storage mechanism 3 to achieve energy storage of the energy storage mechanism 3; when the rotating shaft 1 rotates to the critical point, the length of the energy storage mechanism 3 is compressed to the minimum, and the energy storage mechanism 3 achieves maximum energy storage; after the rotating shaft 1 passes the critical point, the energy storage mechanism 3 releases energy, pushing the rotating shaft 1 to quickly deflect to the test position.

[0040] Specifically, the energy storage mechanism 3 includes a telescopic rod assembly and an energy storage member 33. The length of the telescopic rod assembly is variable, and the energy storage member 33 is mounted on the telescopic rod assembly. The length of the energy storage member 33 varies with the length of the telescopic rod assembly. In this embodiment, the telescopic rod assembly includes a sliding sleeve 31 and a slide rod 32 that are slidably matched. The sleeve 31 is a cylindrical member with at least one end open. One end of the slide rod 32 extends from the opening of the sleeve 31 and can slide back and forth along the sleeve 31. A first limit seat 311 extends externally from the end of the sleeve 31 away from the slide rod 32, and a second limit seat 36 is fixed to the end of the slide rod 32 away from the sleeve 31. The outer peripheral surfaces of the first limit seat 311 and the second limit seat 36 are both stepped surfaces. The energy storage member 33 is mounted on the outer periphery of the slide rod sleeve, and the two ends of the energy storage member 33 are limited by the first limit seat 311 and the second limit seat 36. Preferably, the two ends of the energy storage member 33 are respectively connected to the first limit seat 311 and the second limit seat 36. Further preferably, the telescopic rod assembly further includes a reset member 34, which is also sleeved on the outer periphery of the sliding rod sleeve. The two ends of the reset member 34 are respectively limited by the first limit seat 311 and the second limit seat 36. The reset member 34 is located within the energy storage member 33. The energy storage member 33 and the reset member 34 can be, but are not limited to, springs.

[0041] Furthermore, to facilitate assembly of the energy storage mechanism 3, connecting structures are provided at each end of the telescopic rod assembly. A connecting seat 35 is fixed to the end of the sleeve 31, away from the slide rod 32. A rotatable member 11 is provided on the rotating shaft 1 for rotation. The connecting seat 35 and the rotatable member 11 are hingedly connected to achieve a connection between the energy storage mechanism 3 and the rotating shaft 1. A hinge shaft 37 is fixed to the end of the slide rod 32, away from the sleeve 31. The hinge shaft 37 is hingedly assembled. When the axis of the energy storage mechanism 3 intersects the axis of the rotating shaft 1, the rotating shaft 1 is at a critical point, and the energy storage mechanism 3 is in a maximum energy storage state. There are two test positions, which are located on both sides of the critical point in the circumferential direction. When the rotating shaft 1 is deflected in the forward direction driven by the driving member 2, the rotating shaft 1 first drives the energy storage mechanism 3 to compress and store energy. When the rotating shaft 1 moves to the critical point, the energy storage mechanism 3 stores energy to the maximum. The rotating shaft 1 continues to deflect forward past the critical point. The energy storage mechanism 3 quickly releases energy, and the energy storage mechanism 3 pushes the rotating shaft 1 to deflect quickly to the first test position; when the rotating shaft 1 is deflected in the reverse direction driven by the driving member 2, the rotating shaft 1 first drives the energy storage mechanism 3 to compress and store energy. When the rotating shaft 1 moves to the critical point, the energy storage mechanism 3 stores energy to the maximum. The rotating shaft 1 continues to deflect in the reverse direction past the critical point. The energy storage mechanism 3 quickly releases energy, and the energy storage mechanism 3 pushes the rotating shaft 1 to deflect quickly to the second test position.

[0042] Preferably, in order to limit the deflection range of the rotating shaft 1, a limiting structure can be provided on the rotating member 11. Specifically, a connecting portion 111 is extended from the rotating member 11 for being hinged to the connecting seat 35. Two limiting portions 112 are also extended from the rotating member 11. The two limiting portions 112 are respectively located on both sides of the circumference of the connecting portion 111 with gaps; the first limiting member 622 and the second limiting member 623 are respectively installed corresponding to the two limiting portions 112. The first limiting member 622 and the second limiting member 623 are respectively installed on the outer periphery of the two limiting portions 112, and the deflection range of the rotating shaft 1 is limited by the two limiting portions 112 abutting against the corresponding limiting members.

[0043] In order to realize the assembly of various components, the test fixture of this embodiment also includes a frame 6, the rotating shaft 1, the driving member 2, the energy storage mechanism 3 and the transmission assembly 4 are all arranged on the frame.

[0044] 6, the frame 6 has a mounting surface, on which a first support 61 and a second support 62 are provided. Specifically, the driving member 2 is fixedly mounted on the frame 6, the driving shaft 21 rotatably passes through the first support 61 and is connected to the rotating member 41, and one end of the swinging member 42 is hinged to the first support 61 via a hinge shaft, preferably, the hinge shaft is located directly below the driving shaft 21; the rotating shaft 1 is rotatably mounted on the second support 62, and two parallel brackets 621 are fixed on the second support 62. The rotating shaft 1 is rotatably mounted on the two brackets 621, and the two ends of the rotating shaft 1 extend out of the two brackets 621. One end of the rotating shaft 1 is equipped with a toggle member 43, and the other end of the rotating shaft 1 is connected to the main shaft 51. The rotating member 11 is mounted on the rotating shaft 1 and is located between the two brackets 621; the two ends of the hinge shaft 37 of the energy storage mechanism 3 are respectively hinged to the two brackets 621; the first limit member 622 is set on the two brackets 621, and the second limit member 623 is fixedly mounted.

[0045] This embodiment also provides a use for a test fixture. The test fixture of this embodiment can be used to test a circuit breaker 5. The main shaft 51 of the circuit breaker 5 is connected to the rotating shaft 1 through a coupling. The main shaft 51 deflects with the rotating shaft 1. When the rotating shaft 1 moves to the first test position, the main shaft 51 also rotates to the first test position; when the rotating shaft 1 moves to the second test position, the main shaft 51 also rotates to the second test position. It can be set that when the main shaft 51 of the circuit breaker 5 rotates to the first test position, the circuit breaker 5 is closed; when the main shaft 51 of the circuit breaker 5 rotates to the second test position, the circuit breaker 5 is opened, and vice versa. In this way, the driving member 2 can drive the circuit breaker 5 to close and open quickly, thereby facilitating the testing of the opening and closing of the circuit breaker 5.

[0046] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in this field without departing from the purpose of the present invention.

Claims

1. A test tool, characterized in that: include: Axis of rotation (1); A driving member (2), wherein the driving member (2) drives the rotating shaft (1) to deflect; An energy storage mechanism (3), wherein the energy storage mechanism (3) stores energy as the rotating shaft (1) deflects, and when the rotating shaft (1) deflects past a critical point, the energy storage mechanism (3) releases energy to push the rotating shaft (1) to quickly deflect to a test position; The driving member (2) drives the rotating shaft (1) to reciprocate and deflect through the critical point, the rotating shaft (1) has two test positions, and the two test positions are respectively located on two circumferential sides of the critical point; The driving member (2) drives the rotating shaft (1) to deflect via the transmission assembly (4); The transmission assembly (4) comprises a swinging member (42) and a toggle member (43), wherein the swinging member (42) is hingedly assembled, and the toggle member (43) is rotatably assembled on the rotating shaft (1), and the toggle member (43) has two toggle parts (431) arranged at intervals, and the free end of the swinging member (42) extends between the two toggle parts (431). Driven by the driving member (2), the swinging member (42) deflects and toggle the toggle part (431) to drive the rotating shaft (1) to deflect; The driving member (2) drives the swinging member (42) to swing back and forth through the rotating member (41); the rotating member (41) performs circular motion under the drive of the driving member (2); the outer end of the rotating member (41) is movably connected to the swinging member (42); the rotating member (41) drives the swinging member (42) to swing back and forth; One end of the energy storage mechanism (3) is hingedly assembled, and the other end of the energy storage mechanism (3) is hingedly connected to the rotating shaft (1). The rotating shaft (1) deflects and compresses the length of the energy storage mechanism (3) so that the energy storage mechanism (3) stores energy.

2. A test tool according to claim 1, characterized in that: The energy storage mechanism (3) comprises a telescopic rod assembly and an energy storage member (33); the length of the telescopic rod assembly is telescopically variable; the energy storage member (33) is sleeved on the telescopic rod assembly; and the length of the energy storage member (33) varies with the length of the telescopic rod assembly.

3. A test tool according to claim 2, characterized in that: A rotating member (11) is mounted on the rotating shaft (1), a connecting portion (111) extends from a side of the rotating member (11) close to the energy storage mechanism (3), and the energy storage mechanism (3) is hingedly connected to the connecting portion (111) of the rotating member (11).

4. A test tool according to claim 3, characterized in that: The rotating member (11) is also provided with limiting portions (112) extending from both sides of the connecting portion (111).

5. Use of the test tool as claimed in any one of claims 1 to 4, characterized in that: The testing tool is used for testing a circuit breaker (5); a main shaft (51) of the circuit breaker (5) is connected to the rotating shaft (1) and rotates therewith.

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