Torque measurement force application device and torque measurement system

By combining an electric torque gun and a reaction frame, the problem of uniform rotation and stability in the measurement of opening and closing torque of circuit breakers in existing technologies has been solved, thus achieving efficient and accurate torque measurement.

CN223623734UActive Publication Date: 2025-12-02HENAN PINGGAO ELECTRIC
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Patent Information

Application Number
CN202423315811.9
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-12-31
Publication Date
2025-12-02
Estimated Expiration
2034-12-31

AI Technical Summary

Technical Problem

In existing technologies, the torque wrench cannot be rotated at a constant speed when measuring the opening and closing torque of a circuit breaker, resulting in large errors in the measurement results. Furthermore, it is labor-intensive, cumbersome, and reduces measurement efficiency and effectiveness.

Method used

The device employs a combination of an electric torque gun and a reaction frame. A reducer converts high-speed rotation into low-speed rotation, and the device is connected to the shaft being measured via a transmission sleeve to ensure consistent rotation speed. The external threaded sleeve is pressed and fixed to the reaction frame to achieve stable measurement.

Benefits of technology

It improves the accuracy and efficiency of circuit breaker opening and closing torque measurement, avoids measurement deviations caused by inconsistent manual operation speeds, simplifies the operation process, and saves manpower.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to the technical field of measuring devices or methods suitable for force, work, mechanical power or torque for specific purposes, and especially relates to a force application device for torque measurement and a torque measurement system. The torque measuring and force applying device comprises an electric torque gun and a counter-force frame, one end of the counter-force frame is fixed with a gun body of the electric torque gun and is provided with a through hole for an output shaft of the electric torque gun to pass through, and the other end of the counter-force frame is used for being connected with a shaft rod supporting plate of the circuit breaker and is provided with a through hole for a measured shaft rod on the shaft rod supporting plate to pass through. The output shaft is fixedly connected with a transmission sleeve, the transmission sleeve is located between the penetrating hole and the through hole and used for being connected with a shaft rod to be tested, an external thread sleeve is assembled in the penetrating hole, one end of the external thread sleeve is in threaded connection with the gun body, the other end of the external thread sleeve is provided with a pressing edge, and the pressing edge is matched with the counter-force frame in a pressing mode. The torque measurement force application device does not need manual force application operation of an operator, and ensures that the speed of the rotating force borne by the measured shaft lever is always kept consistent.
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Description

Technical Field

[0001] This utility model relates to the technical field of measuring devices or methods for force, work, mechanical power or torque applicable to specific purposes, and in particular to a torque measuring force application device and torque measuring system. Background Technology

[0002] Gas-insulated metal-enclosed switchgear is widely used in power systems due to its small footprint, compact structure, and reliable operation. As a crucial component of substations, it houses various electrical components besides transformers, including circuit breakers, disconnectors, grounding switches, busbars, voltage transformers, and current transformers. Circuit breakers, as vital components within gas-insulated metal-enclosed switchgear, ensure effective circuit breaking, and their reliability significantly impacts the stable operation of the switchgear. The reliability of circuit breakers primarily depends on various parameters during the opening and closing process. The torque values ​​during opening and closing are significant for improving circuit breaker reliability. Measuring and analyzing the circuit breaker's transmission torque allows for corresponding improvements and enhancements, effectively improving the consistency of the circuit breaker's opening and closing parameters. In measuring the circuit breaker's opening and closing torque values, auxiliary fixtures are often used to connect the circuit breaker's drive shaft to the measuring equipment.

[0003] For example, Chinese utility model patent with authorization announcement number CN1207231687U and authorization announcement date of April 13, 2018 discloses a tooling for testing the opening and closing torque of a 145kV GIS tank-type circuit breaker. The tooling includes a connecting frame and a torque wrench. The connecting frame is fixedly installed on the cover plate of the circuit breaker by bolts. A rotating shaft is rotatably installed on the connecting frame. The rotating shaft is connected to a connecting plate. The connecting plate is connected to a pull rod by a pin. The end of the pull rod is also connected to the drive shaft of the circuit breaker by a pin. The torque wrench is connected to the rotating shaft through a sleeve. By rotating the torque wrench clockwise or counterclockwise, the sleeve, rotating shaft, connecting plate and pull rod will move, thereby driving the drive shaft of the circuit breaker to perform opening and closing movements. The torque required for opening and closing can be measured by the torque wrench.

[0004] While the testing fixture described above can measure the torque during circuit breaker opening and closing, it requires manual operation of the torque wrench. During manual operation, it's impossible to guarantee a uniform rotation speed. As the rotation speed of the torque wrench changes, acceleration occurs, leading to inaccurate torque measurements. Furthermore, different operators rotate the torque wrench at different speeds, causing deviations in the measurement results. This process is labor-intensive, introduces significant errors, and is cumbersome, reducing the efficiency and effectiveness of torque measurement and making it inconvenient to use. Utility Model Content

[0005] The purpose of this invention is to provide a torque measurement and application device to solve the problem of large errors in torque measurement results and high manpower consumption caused by the inability to rotate a torque wrench at a uniform speed. Simultaneously, the purpose of this invention is to provide a torque measurement system that, by using the aforementioned torque measurement and application device, solves the problems of cumbersome manual operation of torque wrenches, reduced efficiency and effectiveness of torque measurement, and inconvenience in use.

[0006] To achieve the above objectives, the torque measuring and force application device of this utility model adopts the following technical solution:

[0007] A torque measuring force application device includes an electric torque gun and a reaction frame. One end of the reaction frame is fixed to the gun body of the electric torque gun and has a through hole for the output shaft of the electric torque gun to pass through. The other end is used to connect to the shaft support plate of a circuit breaker and has a through hole for the shaft to be measured on the shaft support plate to pass through. The output shaft is fixedly connected to a transmission sleeve, which is located between the through hole and the through hole. The transmission sleeve is used to connect to the shaft to be measured. An external threaded sleeve is fitted inside the through hole. One end of the external threaded sleeve is threaded to the gun body, and the other end has a pressing edge. The pressing edge is pressed tightly against the reaction frame.

[0008] Furthermore, the electric torque gun includes a reducer, which is used to convert the high-speed rotation of the electric torque gun into low-speed rotation and output it at a constant speed by the output shaft.

[0009] Furthermore, the end of the transmission sleeve away from the output shaft has a shaft hole arranged along the axial direction of the transmission sleeve, which is used to connect with the shaft being measured.

[0010] Furthermore, the transmission sleeve is configured as a spline sleeve, and the shaft hole is configured as a spline hole, which is used to engage with the spline of the shaft being measured.

[0011] Furthermore, the outer circumferential surface of the external threaded sleeve is fitted with a through hole for positioning, and the output shaft of the electric torque gun passes through the inside of the external threaded sleeve.

[0012] Furthermore, a gasket is clamped between the pressing edge of the external threaded sleeve and the reaction frame.

[0013] Furthermore, the reaction frame includes a positioning plate for fixing to the body of the electric torque gun and a docking flange for connecting to the shaft support plate of the circuit breaker. The positioning plate and the docking flange are fixedly connected by a support rod, and the through hole and the through hole are located at the center of the positioning plate and the docking flange, respectively.

[0014] Furthermore, the docking flange is provided with sleeve holes around its center, corresponding to the fastening bolts on the shaft support plate of the circuit breaker, for fitting onto the corresponding fastening bolts to prevent the docking flange from rotating relative to the shaft support plate of the circuit breaker.

[0015] Furthermore, the support rod is symmetrically arranged about the central axis of the mating flange.

[0016] Beneficial Effects: This utility model's torque measurement force application device is a pioneering invention. By simultaneously connecting the electric torque gun and the circuit breaker's shaft support plate via a reaction frame, the reaction frame provides support and relative positioning for the electric torque gun and shaft support plate, ensuring the stability of the device during torque measurement. Through holes and perforations are provided on the reaction frame, allowing the output shaft of the electric torque gun to pass through the through hole and the measured shaft to pass through the through hole. The through hole and through hole provide guidance and limitation for the output shaft and the measured shaft, respectively. By connecting a transmission sleeve to the output shaft of the electric torque gun and connecting the transmission sleeve to the measured shaft, the torque output by the electric torque gun can be transmitted to the measured shaft through the transmission sleeve, thereby... This device enables torque measurement of the shaft under test. Furthermore, by installing an external threaded sleeve within the perforation, when the sleeve is threaded into the gun body, the pressure edge on the sleeve exerts a clamping force on the reaction frame, thus fixing the reaction frame to the gun body. This ensures the device remains stable throughout the torque measurement process. Moreover, no manual force application is required during torque measurement, saving manpower. The stable output of the electric torque gun ensures that the rotational speed of the shaft under test remains consistent, avoiding measurement deviations caused by inconsistent rotational speeds during manual operation.

[0017] The torque measurement system of this utility model adopts the following technical solution:

[0018] A torque measurement system includes a torque measuring force application device, which comprises an electric torque gun and a reaction frame. One end of the reaction frame is fixed to the gun body of the electric torque gun and has a through hole for the output shaft of the electric torque gun to pass through. The other end is used to connect to the shaft support plate of a circuit breaker and has a through hole for the shaft to be measured on the shaft support plate to pass through. The output shaft is fixedly connected to a transmission sleeve, which is located between the through hole and the through hole. The transmission sleeve is used to connect to the shaft to be measured. An external threaded sleeve is fitted inside the through hole. One end of the external threaded sleeve is threaded to the gun body, and the other end has a pressing edge, which is pressed tightly against the reaction frame.

[0019] Furthermore, the electric torque gun includes a reducer, which is used to convert the high-speed rotation of the electric torque gun into low-speed rotation and output it at a constant speed by the output shaft.

[0020] Furthermore, the end of the transmission sleeve away from the output shaft has a shaft hole arranged along the axial direction of the transmission sleeve, which is used to connect with the shaft being measured.

[0021] Furthermore, the transmission sleeve is configured as a spline sleeve, and the shaft hole is configured as a spline hole, which is used to engage with the spline of the shaft being measured.

[0022] Furthermore, the outer circumferential surface of the external threaded sleeve is fitted with a through hole for positioning, and the output shaft of the electric torque gun passes through the inside of the external threaded sleeve.

[0023] Furthermore, a gasket is clamped between the pressing edge of the external threaded sleeve and the reaction frame.

[0024] Furthermore, the reaction frame includes a positioning plate for fixing to the body of the electric torque gun and a docking flange for connecting to the shaft support plate of the circuit breaker. The positioning plate and the docking flange are fixedly connected by a support rod, and the through hole and the through hole are located at the center of the positioning plate and the docking flange, respectively.

[0025] Furthermore, the docking flange is provided with sleeve holes around its center, corresponding to the fastening bolts on the shaft support plate of the circuit breaker, for fitting onto the corresponding fastening bolts to prevent the docking flange from rotating relative to the shaft support plate of the circuit breaker.

[0026] Furthermore, the support rod is symmetrically arranged about the central axis of the mating flange.

[0027] Beneficial Effects: This torque measurement system is a pioneering invention. The electric torque gun and the circuit breaker's shaft support plate are simultaneously connected via a reaction frame, providing support and relative positioning for both, ensuring device stability during torque measurement. Through holes and perforations are provided on the reaction frame, allowing the output shaft of the electric torque gun to pass through the through hole and the measured shaft to pass through the through hole. The through hole and through hole provide guidance and limitation for the output shaft and the measured shaft, respectively. By connecting a transmission sleeve to the output shaft of the electric torque gun and connecting the transmission sleeve to the measured shaft, the torque output by the electric torque gun can be transmitted to the measured shaft through the transmission sleeve, thereby achieving torque measurement of the measured shaft. Furthermore… By setting an external threaded sleeve inside the perforation, when the external threaded sleeve is threaded into the gun body, the pressure edge on the external threaded sleeve will generate a clamping force on the reaction frame, thereby fixing the reaction frame to the gun body. This ensures that the device remains stable throughout the torque measurement process. Furthermore, no manual force application is required during torque measurement, saving manpower. The stable and uniform output of the electric torque gun ensures that the rotational speed of the measured shaft remains consistent, avoiding the deviation in measurement results caused by inconsistent rotational speeds during manual operation. Moreover, the torque measurement process is simple and convenient, improving the efficiency and effectiveness of torque measurement. Attached Figure Description

[0028] Figure 1 This is a cross-sectional structural schematic diagram of one embodiment of the torque measuring and force application device of this utility model;

[0029] Figure 2 for Figure 1 A magnified view of a portion of the image;

[0030] Figure 3 This is a schematic diagram of the overall structure of one embodiment of the torque testing device of this utility model;

[0031] Figure 4 for Figure 3 A magnified view of a portion of the image.

[0032] In the diagram: 1. Electric torque gun; 2. Reaction frame; 3. Output shaft; 4. Through hole; 5. Shaft support plate; 6. Shaft under test; 7. Through hole; 8. Transmission sleeve; 9. External threaded sleeve; 10. Pressing edge; 11. Reducer; 12. Shaft hole; 13. Gasket; 14. Positioning plate; 15. Connecting flange; 16. Support rod; 17. Sleeve hole; 18. Fastening bolt. Detailed Implementation

[0033] The features and performance of this utility model will be further described in detail below with reference to the embodiments.

[0034] As one of the main electrical components of gas-insulated metal-enclosed switchgear, the consistency of the circuit breaker's opening and closing parameters determines its reliability. Therefore, before leaving the factory, the opening and closing torque of the circuit breaker's drive shaft must be measured to ensure that the opening and closing torque meets the usage requirements. Currently, the opening and closing torque of the circuit breaker's drive shaft is usually measured using a torque wrench. The torque wrench is connected to the drive shaft of the circuit breaker, and the measurement is achieved by manually rotating the torque wrench. However, it is difficult to keep the rotation speed of the torque wrench consistent during manual operation, resulting in a large deviation in the measured results. To avoid this problem, the automatic output of an electric torque gun can be used to avoid manual operation. The electric torque gun is connected to the shaft being measured through a transmission device, so that the torque output of the electric torque gun is directly transmitted to the shaft being measured, thereby realizing the torque measurement of the shaft being measured. Based on the above inventive concept, this utility model proposes a torque measurement force application device and torque measurement system. The electric torque gun is connected to the circuit breaker through a reaction frame, and the output head of the electric torque gun is connected to the shaft being measured through a transmission end. This allows the torque automatically output by the electric torque gun to be transmitted to the shaft being measured in a stable and uniform manner, ensuring that the rotational speed of the shaft being measured remains consistent. This improves the efficiency of torque measurement, especially the measurement accuracy.

[0035] The implementation method of the torque measuring and force application device of this utility model is as follows:

[0036] See Figures 1 to 4As a basic embodiment of this utility model, the torque measuring force application device includes an electric torque gun 1 and a reaction frame 2. One end of the reaction frame 2 is fixed to the gun body of the electric torque gun 1 and has a through hole 4 for the output shaft 3 of the electric torque gun 1 to pass through. The other end is used to connect to the shaft support plate 5 of the circuit breaker and has a through hole 7 for the shaft 6 to be measured on the shaft support plate 5 to pass through. The reaction frame 2 can simultaneously connect the electric torque gun 1 and the shaft support plate 5 of the circuit breaker, so that the reaction frame 2 supports and relatively positions the electric torque gun 1 and the shaft support plate 5, ensuring the stability of the device during the torque measurement process. The through hole 4 and the through hole 7 can respectively guide and limit the output shaft 3 and the shaft 6 passing through from the inside. The output shaft 3 is fixedly connected to a transmission sleeve 8, which is located between the through hole 4 and the through hole 7. The transmission sleeve 8 is used to connect with the shaft 6 being measured. At this time, the torque output by the electric torque gun 1 can be transmitted to the shaft 6 being measured through the transmission sleeve 8, thereby realizing the torque measurement of the shaft 6 being measured. An external threaded sleeve 9 is installed in the through hole 4. One end of the external threaded sleeve 9 is threadedly connected to the gun body, and the other end is provided with a pressure edge 10. The pressure edge 10 is pressed and fitted with the reaction frame 2, thereby fixing the reaction frame 2 and the gun body. This ensures that the device remains stable during the torque measurement process. Furthermore, no manual operation is required during the torque measurement process, saving manpower. The stable and uniform output of the electric torque gun 1 ensures that the rotation speed of the shaft 6 being measured remains consistent, avoiding the situation where the rotation speed is inconsistent during manual operation, which leads to deviations in the measurement results. Moreover, the torque measurement process is simple and convenient, which can improve the efficiency and accuracy of torque measurement.

[0037] As a preferred embodiment of this utility model, the electric torque gun 1 includes a reducer 11. The reducer 11 is used to convert the high-speed rotation of the electric torque gun 1 into a low-speed rotation and output it at a constant speed by the output shaft 3. The reducer 11 enables the measured shaft rod 6 to rotate at a low and constant speed with the output shaft 3 of the electric torque gun 1, avoiding the situation where the rotation speed of the electric torque gun 1 is too high, causing excessive wear to the measured shaft rod 6 and rendering it unusable.

[0038] In a preferred embodiment of this utility model, the end of the transmission sleeve 8 away from the output shaft 3 is provided with a shaft hole 12 arranged along the axial direction of the transmission sleeve 8. The shaft hole 12 is used to connect with the shaft rod 6 to be measured. The shaft rod 6 to be measured is guided and limited by the shaft hole 12, so as to avoid the relative position between the shaft rod 6 and the transmission sleeve 8 shifting during the rotation process, thereby improving the connection reliability between the shaft rod 6 and the transmission sleeve 8.

[0039] In a preferred embodiment of this utility model, the transmission sleeve 8 is a spline sleeve and the shaft hole 12 is a spline hole. The shaft hole 12 is used to engage with the measured shaft 6 via spline. The spline engagement makes the connection between the measured shaft 6 and the shaft hole 12 more secure, ensuring that the measured shaft 6 can always maintain a stable connection with the shaft hole 12 during the torque measurement process.

[0040] In a preferred embodiment of this utility model, the outer circumferential surface of the external threaded sleeve 9 is positioned and engaged with the through hole 4. The output shaft 3 of the electric torque gun 1 passes through the inside of the external threaded sleeve 9. The output shaft 3 of the electric torque gun 1 does not contact the external threaded sleeve 9 when rotating. The external threaded sleeve 9 only provides clamping and positioning for the reaction frame 2 and will not interfere with the rotation output of the electric torque gun 1. In addition, the external threaded sleeve 9 is positioned and engaged with the through hole 4, that is, the position between the external threaded sleeve 9 and the through hole 4 is relatively fixed and will not rotate.

[0041] In a preferred embodiment of this utility model, a gasket 13 is sandwiched between the pressing edge 10 of the external threaded sleeve 9 and the reaction frame 2. When the external threaded sleeve 9 is threadedly connected to the gun body of the electric torque gun 1, the reaction frame 2 will be subjected to the pressing force of the pressing edge 10 of the external threaded sleeve 9. The gasket 13 can disperse the pressing force of the pressing edge 10 on the reaction frame 2, and prevent the pressing edge 10 from directly contacting the reaction frame 2, causing extrusion deformation of the reaction frame 2, thereby reducing the strength of the reaction frame 2.

[0042] In a preferred embodiment of this utility model, the reaction frame 2 includes a positioning plate 14 for fixing the body of the electric torque gun 1 and a docking flange 15 for connecting to the shaft support plate 5 of the circuit breaker. The positioning plate 14 and the docking flange 15 are fixedly connected by a support rod 16. The through hole 4 and the through hole 7 are located at the center of the positioning plate 14 and the docking flange 15, respectively. The positioning plate 14, the support rod 16 and the docking flange 15 work together to provide reliable support and positioning for the electric torque gun 1 and the shaft 6 being measured, ensuring that the electric torque gun 1 and the shaft 6 being measured always maintain a stable connection during the torque measurement process. Furthermore, the support rod 16 provides space for the connection between the shaft 6 being measured and the transmission sleeve 8, allowing the transmission sleeve 8 and the shaft 6 being measured to be arranged axially, which is beneficial for torque measurement.

[0043] In a preferred embodiment of this utility model, the docking flange 15 is provided with sleeve holes 17 around its center, corresponding to the fastening bolts 18 on the shaft support plate 5 of the circuit breaker, for fitting onto the corresponding fastening bolts 18 to prevent the docking flange 15 from rotating relative to the shaft support plate 5 of the circuit breaker. In use, the sleeve holes 17 on the docking flange 15 are aligned with the fastening bolts 18 on the shaft support plate 5 of the circuit breaker and fitted together, thereby fixing the position between the docking flange 15 and the shaft support plate 5, thus ensuring the position of the reaction frame 2 relative to the shaft support plate 5 is fixed, achieving anti-rotation, and improving the reliability of the connection.

[0044] In a preferred embodiment of this utility model, the support rods 16 are symmetrically arranged about the central axis of the connecting flange 15. The symmetrical arrangement of the support rods 16 can improve the overall stability of the reaction frame 2, so that the reaction frame 2 is always subjected to uniform force, is not easily damaged, and ensures the connection reliability of the reaction frame 2.

[0045] The process of using the torque measuring force application device of this utility model is as follows: First, the device is connected to the fastening bolt 18 on the shaft support plate 5 of the circuit breaker through the sleeve hole 17, so that the connecting flange 15 is connected to the shaft support plate 5 to prevent rotation. At the same time, the shaft 6 to be measured on the shaft support plate 5 passes through the through hole 7 of the connecting flange 15 and extends into the shaft hole 12 of the transmission sleeve 8, forming a spline fit with the shaft hole 12. After ensuring that the shaft 6 to be measured is properly fitted with the shaft hole 12, the electric torque gun 1 is turned on. The electric torque gun 1 is decelerated by the reducer 11 and outputs a low-speed and uniform rotational torque from the output shaft 3 to the transmission sleeve 8. The transmission sleeve 8 receives the rotational torque and transmits it to the shaft 6 to be measured. Thus, the opening and closing torque of the shaft 6 to be measured on the circuit breaker is measured.

[0046] Implementation method of the torque measurement system of this utility model:

[0047] The torque measurement system includes the aforementioned torque measurement and force application device. The specific structure of the torque measurement and force application device will not be detailed here. By using the aforementioned torque measurement and force application device, the opening and closing torque of the measured shaft 6 on the circuit breaker can be accurately measured with high efficiency. The entire torque measurement process is relatively simple and convenient. Through the stable and uniform output of the electric torque gun 1, the rotational speed of the measured shaft 6 is kept consistent, avoiding the deviation of measurement results caused by inconsistent rotational speeds during manual operation. Furthermore, the torque measurement process is simple and convenient, which can improve the efficiency and effectiveness of torque measurement.

[0048] In addition, the torque measurement and force application device can also be connected to intelligent equipment. The intelligent equipment mainly includes a cable reel, a wireless AP, a controller, and a reaction rod. The cable reel is used to supply power to the controller and the industrial computer. The wireless AP is used to maintain communication between the electric torque gun 12 and the controller. The controller is used to control the electric torque gun 1. The industrial computer is used to store data and manually input product information such as product numbers and to issue programs. The above-mentioned intelligent equipment is all existing technology and will not be described in detail here. Through these intelligent devices, the test data in the torque measurement process can be recorded and stored, which facilitates the study of the measurement results of the opening and closing torque of the electric torque gun 1 on the measured shaft 6.

[0049] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. The patent protection scope of the present utility model shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present utility model shall also be included within the protection scope of the present utility model.

Claims

1. A torque measuring and force application device, characterized in that: The device includes an electric torque gun and a reaction frame. One end of the reaction frame is fixed to the gun body of the electric torque gun and has a through hole for the output shaft of the electric torque gun to pass through. The other end is used to connect to the shaft support plate of the circuit breaker and has a through hole for the shaft to be measured on the shaft support plate to pass through. The output shaft is fixedly connected to a transmission sleeve, which is located between the through hole and the through hole. The transmission sleeve is used to connect to the shaft to be measured. An external threaded sleeve is fitted inside the through hole. One end of the external threaded sleeve is threaded to the gun body, and the other end has a pressing edge. The pressing edge is pressed and fitted with the reaction frame.

2. The torque measuring and force application device according to claim 1, characterized in that: The electric torque gun includes a reducer, which is used to convert the high-speed rotation of the electric torque gun into low-speed rotation and output it at a constant speed by the output shaft.

3. The torque measuring and force application device according to claim 1, characterized in that: The transmission sleeve has a shaft hole at one end away from the output shaft, which is arranged along the axial direction of the transmission sleeve. The shaft hole is used to connect with the shaft being measured.

4. The torque measuring and force application device according to claim 3, characterized in that: The transmission sleeve is a spline sleeve, and the shaft hole is a spline hole, which is used to engage with the spline of the shaft being measured.

5. The torque measuring and force application device according to claim 1, characterized in that: The outer circumferential surface of the external threaded sleeve is positioned and fitted with the through hole, and the output shaft of the electric torque gun passes through the inside of the external threaded sleeve.

6. The torque measuring and force application device according to claim 5, characterized in that: A gasket is clamped between the pressing edge of the external threaded sleeve and the reaction frame.

7. The torque measuring and force application device according to claim 1, characterized in that: The reaction frame includes a positioning plate for fixing to the body of the electric torque gun and a docking flange for connecting to the shaft support plate of the circuit breaker. The positioning plate and the docking flange are fixedly connected by a support rod. The through hole and the through hole are located at the center of the positioning plate and the docking flange, respectively.

8. The torque measuring and force application device according to claim 7, characterized in that: The docking flange is provided with sleeve holes around its center, corresponding to the fastening bolts on the shaft support plate of the circuit breaker, for fitting onto the corresponding fastening bolts to prevent the docking flange from rotating relative to the shaft support plate of the circuit breaker.

9. The torque measuring and force application device according to claim 7, characterized in that: The support rod is symmetrically arranged about the central axis of the mating flange.

10. A torque measurement system, characterized in that: Includes the torque measuring and force application device as described in any one of claims 1-9.