Spring force real-time monitoring device and method for circuit breaker operating mechanism

Abstract

The application discloses a kind of spring force real-time monitoring device and method of circuit breaker operating mechanism, monitoring device includes monitoring terminal, runner, crank connecting rod, pivot and drive assembly;Crank connecting rod and operating lever are located on the same plane, one end of crank connecting rod is hinged with the end of operating lever away from limiting part, the other end of crank connecting rod is hinged with the position adjacent to the edge on the rotary surface of runner, runner is arranged on pivot, and coaxially rotates with pivot, and the rotary surface of runner is parallel with operating lever;Drive assembly is connected with pivot, and the side of pivot in two directions perpendicular to each other is respectively provided with first resistance strain gauge and second resistance strain gauge, and monitoring terminal is connected with first resistance strain gauge and second resistance strain gauge respectively.The stress data analysis of first resistance strain gauge and second resistance strain gauge obtains the force size and direction of spring, and the force condition of spring of circuit breaker operating mechanism is conveniently and accurately monitored.

Description

Technical Field

[0001] This invention relates to the field of circuit breaker performance testing technology, and in particular to a device and method for real-time monitoring of the spring force of a circuit breaker operating mechanism. Background Technology

[0002] With the continuous development of ultra-high voltage (UHV) technology, the performance requirements for high-voltage switchgear are constantly increasing. High-voltage switchgear equipment includes specialized circuit breakers designed to close, carry, and interrupt current under normal conditions, and to interrupt current under abnormal conditions within a specified time. Springs, as crucial components of the circuit breaker's operating mechanism, play a vital role in storing energy for opening and closing. With increasing usage, springs may experience fatigue deformation and fail to meet operational requirements. Therefore, it is necessary to monitor the stress on the springs to prevent unexpected situations.

[0003] However, current devices for detecting the force on the springs of circuit breaker operating mechanisms require disassembling the existing circuit breaker operating mechanism and installing the testing device onto the spring. This existing method has significant limitations and alters the force distribution on the spring, leading to inaccurate measurement results and cumbersome operation. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a device and method for real-time monitoring of the spring force of a circuit breaker operating mechanism, which can conveniently and accurately monitor the spring force of the circuit breaker operating mechanism.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0006] A real-time monitoring device for spring force of a circuit breaker operating mechanism, the circuit breaker operating mechanism including a mounting frame, an operating rod and a spring; the mounting frame is provided with a linear limiting through hole, the operating rod is disposed through the linear limiting through hole, one end of the operating rod is provided with a limiting member, the spring is sleeved on the operating rod and is clamped between the limiting member and the mounting frame, the monitoring device includes a monitoring terminal, a rotating wheel, a crank connecting rod, a rotating shaft and a drive assembly;

[0007] The crank connecting rod and the operating lever are located on the same plane. One end of the crank connecting rod is hinged to the end of the operating lever away from the limiting member. The other end of the crank connecting rod is hinged to the position near the edge of the rotating surface of the wheel. The wheel is disposed on the rotating shaft and rotates coaxially with the rotating shaft. The rotating surface of the wheel is parallel to the operating lever.

[0008] The drive assembly is connected to the rotating shaft, and the rotating shaft is provided with a first resistance strain gauge and a second resistance strain gauge on its sides in two mutually perpendicular directions.

[0009] The monitoring terminal is connected to the first resistance strain gauge and the second resistance strain gauge, respectively.

[0010] To solve the above-mentioned technical problems, another technical solution adopted by the present invention is as follows:

[0011] A method for real-time monitoring of spring force in a circuit breaker operating mechanism, applied to the aforementioned real-time monitoring device for spring force in a circuit breaker operating mechanism, includes the following steps:

[0012] S1. Start the drive assembly, drive the rotating wheel to rotate through the rotating shaft, so that the crank connecting rod pulls the operating lever, and the spring deforms;

[0013] S2. Calculate the first stress and the second stress on the first resistance strain gauge and the second resistance strain gauge respectively during the rotation of the shaft.

[0014] S3. Based on the first stress and the second stress, the magnitude and direction of the force on the spring are obtained.

[0015] The beneficial effects of this invention are as follows: It provides a real-time monitoring device and method for the spring force of a circuit breaker operating mechanism, which is equipped with a transmission structure consisting of a rotating shaft, a rotating wheel, and a crank connecting rod. The rotating shaft is driven to rotate by a driving component, thereby driving the crank connecting rod to pull the operating rod, causing the spring to deform under force. The operating mechanism does not need to be disassembled during installation, and the structure is simple. The magnitude and direction of the spring force are obtained by analyzing the stress data of the first and second resistance strain gauges, which can conveniently and accurately monitor the spring force of the circuit breaker operating mechanism. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the installation of a real-time monitoring device for spring force on a circuit breaker operating mechanism according to the present invention on the circuit breaker operating mechanism.

[0017] Figure 2 This is a schematic diagram showing the installation positions of the first and second resistance strain gauges in a real-time monitoring device for the spring force of a circuit breaker operating mechanism according to the present invention.

[0018] Figure 3 This is a schematic diagram illustrating the steps of a real-time monitoring method for the spring force of a circuit breaker operating mechanism according to the present invention.

[0019] Figure 4 This is an equivalent schematic diagram of the motion process of the crank connecting rod in a real-time monitoring method for spring force on a circuit breaker operating mechanism according to the present invention.

[0020] Figure 5 This is a schematic diagram of the rotation angle distribution of the wheel in a real-time monitoring method for the spring force of a circuit breaker operating mechanism according to the present invention.

[0021] Label Explanation:

[0022] 1. Operating lever; 2. Spring; 3. Limit bearing; 4. Crank connecting rod; 5. Rotary wheel; 6. Pawl; 7. Mounting bracket; 8. Rotating shaft; 9. First transmission gear; 10. Torque measurement module; 11. Rotating motor; 12. Second transmission gear; 13. First resistance strain gauge; 14. Second resistance strain gauge. Detailed Implementation

[0023] To explain in detail the technical content, objectives, and effects of the present invention, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0024] Please refer to Figure 1 and Figure 2 A real-time monitoring device for spring force of a circuit breaker operating mechanism, wherein the circuit breaker operating mechanism includes a mounting frame 7, an operating rod 1, and a spring 2; the mounting frame 7 is provided with a linear limiting through hole, the operating rod passes through the linear limiting through hole, one end of the operating rod is provided with a limiting member, the spring is sleeved on the operating rod, and the spring is clamped between the limiting member and the mounting frame; the monitoring device includes a monitoring terminal, a rotating wheel 5, a crank connecting rod 4, a rotating shaft 8, and a drive assembly;

[0025] The crank connecting rod and the operating lever are located on the same plane. One end of the crank connecting rod is hinged to the end of the operating lever away from the limiting member. The other end of the crank connecting rod is hinged to the position near the edge of the rotating surface of the wheel. The wheel is disposed on the rotating shaft and rotates coaxially with the rotating shaft. The rotating surface of the wheel is parallel to the operating lever.

[0026] The drive assembly is connected to the rotating shaft, and the rotating shaft is provided with a first resistance strain gauge 13 and a second resistance strain gauge 14 on its sides in two mutually perpendicular directions.

[0027] The monitoring terminal is connected to the first resistance strain gauge and the second resistance strain gauge respectively.

[0028] As can be seen from the above description, the beneficial effects of the present invention are as follows: It provides a real-time monitoring device for the spring force of a circuit breaker operating mechanism, including a transmission structure composed of a rotating shaft, a rotating wheel, and a crank connecting rod. The rotating shaft is driven to rotate by a driving component, thereby the rotating wheel drives the crank connecting rod to pull the operating rod, causing the spring to deform under force. The operating mechanism does not need to be disassembled during installation, and the structure is simple. The magnitude and direction of the spring force are obtained by analyzing the stress data of the first resistance strain gauge and the second resistance strain gauge, which can conveniently and accurately monitor the spring force of the circuit breaker operating mechanism.

[0029] Furthermore, the drive assembly includes a first transmission gear 9, a second transmission gear 12, and a rotary motor 11;

[0030] The first transmission wheel is sleeved on the rotating shaft, and the second transmission gear is disposed on the movable end of the rotating motor;

[0031] The first transmission gear meshes with the second transmission gear.

[0032] As can be seen from the above description, the drive assembly consists of a first transmission gear, a second transmission gear, and a rotating motor. Relying on the meshing connection between the first transmission gear and the second transmission gear, the rotation amount of the shaft can be stably and accurately controlled.

[0033] Furthermore, it also includes a torque measurement module 10, which is disposed on the rotating shaft and is used to obtain the torque of the rotating shaft.

[0034] As can be seen from the above description, by setting up a torque measurement module, the real-time torque of the shaft can be easily measured, providing reliable data support for force monitoring.

[0035] Furthermore, the rotating wheel is a ratchet, and a pawl 6 is provided on the mounting bracket at a position adjacent to the circumferential side of the rotating wheel.

[0036] In this embodiment, by setting a ratchet and pawl cooperation structure, unidirectional rotation of the wheel can be achieved.

[0037] Please refer to Figures 3 to 5 A method for real-time monitoring of spring force in a circuit breaker operating mechanism, applied to the aforementioned real-time monitoring device for spring force in a circuit breaker operating mechanism, includes the following steps:

[0038] S1. Start the drive assembly, drive the rotating wheel to rotate through the rotating shaft, so that the crank connecting rod pulls the operating lever, and the spring deforms;

[0039] S2. Calculate the first stress and the second stress on the first resistance strain gauge and the second resistance strain gauge respectively during the rotation of the shaft.

[0040] S3. Based on the first stress and the second stress, the magnitude and direction of the force on the spring are obtained.

[0041] As can be seen from the above description, the beneficial effects of the present invention are as follows: It provides a method for real-time monitoring of the spring force of a circuit breaker operating mechanism. By utilizing a transmission structure composed of a rotating shaft, a rotating wheel, and a crank connecting rod, the change in spring force is converted into the change in stress on the first and second resistance strain gauges on the rotating shaft. The magnitude and direction of the spring force are obtained by analyzing the stress data of the first and second resistance strain gauges, thus conveniently and accurately monitoring the spring force of the circuit breaker operating mechanism.

[0042] Further, step S2 includes:

[0043] S21. Use a resistance measuring instrument to measure the first resistance change and the second resistance change of the first resistance strain gauge and the second resistance strain gauge respectively during the rotation of the shaft;

[0044] S22. Taking the orientation of the first resistance strain gauge as the X direction and the orientation of the second resistance strain gauge as the Y direction, calculate the first stress and the second stress based on the changes in the first and second resistance values. The expressions are as follows:

[0045]

[0046]

[0047] Where, σ x For the first stress, σ y Δ represents the second stress, and R X For the first resistance change, ΔR y For the second resistance change, R X0 R is the initial resistance of the first resistance strain gauge. y0 Let E be the initial resistance of the second resistance strain gauge, E be the elastic modulus of the materials of the first and second resistance strain gauges, and K be the sensitivity coefficient of the first and second resistance strain gauges.

[0048] As can be seen from the above description, during the rotation process, the shaft will be subjected to force and deform, which will cause the resistance values ​​of the first resistance strain gauge and the second resistance strain gauge to change. Therefore, stress analysis of the first resistance strain gauge and the second resistance strain gauge can be performed with the help of a resistance measuring instrument.

[0049] Further, step S3 includes:

[0050] S31. Based on the first stress and the second stress, calculate the stress on the rotating shaft, the expression of which is:

[0051]

[0052] S32. Based on the stress on the shaft, the torque of the shaft, and the distance from the shaft to the center of the wheel, calculate the radial force and circumferential force of the shaft. The expressions are as follows:

[0053] F r =σ m ;

[0054]

[0055] Among them, F r For the radial force, F t The circumferential force is M, the torque of the rotating shaft is M, and R1 is the distance from the rotating shaft to the center of the wheel.

[0056] S33. Calculate the magnitude and direction of the force on the spring based on the radial force and the circumferential force.

[0057] As can be seen from the above description, the stress on the first and second resistance strain gauges is converted into a force analysis of the rotating shaft. Based on the force analysis of the rotating shaft, the stress condition of the spring can be investigated, so as to monitor the force on the spring without damaging the operating mechanism where the spring is located.

[0058] Further, step S33 includes:

[0059] S331. Obtain and calculate the angle between the radial force and the circumferential force, the expression of which is:

[0060]

[0061] S332. Calculate the rotation angle of the wheel based on the angle between the radial force and the circumferential force:

[0062] When ΔR X <0 and ΔR y <0 o'clock:

[0063] α = 90° - δ;

[0064] When ΔR X >0 and ΔR y <0 o'clock:

[0065] α = 90° + δ;

[0066] When ΔR X >0 and ΔR y >0:

[0067] α = 270° - δ;

[0068] When ΔR X <0 and ΔR y >0:

[0069] α = 270° + δ;

[0070] S333. Based on the rotation angle of the wheel, the direction of the force on the spring is obtained. When ΔR X When ΔR < 0, the spring is stretched; when ΔR < 0, the spring is stretched. X When the value is greater than 0, the spring is compressed.

[0071] As can be seen from the above description, the rotation angle of the rotary wheel is used to determine whether the crank connecting rod is in a pulling or pushing state, which in turn corresponds to whether the spring is stretched or compressed.

[0072] Furthermore, step S33 also includes:

[0073] S334. Obtain and calculate the magnitude of the first angle between the radial force and the X direction, the expression of which is:

[0074] When ΔR y <0 o'clock:

[0075] θ = δ;

[0076] When ΔR y >0:

[0077] θ = 360 - δ;

[0078] S335. Based on the radial force and the circumferential force, calculate the force acting on the crank connecting rod, the expression of which is:

[0079]

[0080] S336. Based on the first included angle and the length of the crank connecting rod, calculate the second included angle between the crank connecting rod and the operating lever, the expression of which is as follows:

[0081]

[0082] S337. Based on the first included angle, the second included angle, and the force acting on the crank connecting rod, calculate the force on the spring, the expression of which is:

[0083]

[0084] Please refer to 1 and Figure 2 Embodiment 1 of the present invention is as follows:

[0085] A real-time monitoring device for the spring force of a circuit breaker operating mechanism, the monitoring device includes a monitoring terminal, a rotating wheel, a crank connecting rod, a rotating shaft, and a drive assembly; the monitoring terminal includes a resistance measuring instrument and a control unit;

[0086] Before proceeding, the general operating mechanism of a circuit breaker is introduced as follows, such as... Figure 1As shown, the circuit breaker operating mechanism includes a mounting bracket, an operating rod, and a spring. The mounting bracket has a linear limiting through hole through which the operating rod passes. One end of the operating rod has a limiting component. The spring is sleeved on the operating rod and is clamped between the limiting component and the mounting bracket. The end of the spring near the operating rod is welded to the limiting component. Furthermore, a limiting bearing 3 is installed at the linear limiting through hole to restrict the degree of freedom of the operating rod, so that the operating rod can only move in the vertical direction.

[0087] like Figure 1 and Figure 2 As shown, after being installed on the circuit breaker operating mechanism, the crank connecting rod and the operating lever are located on the same plane. One end of the crank connecting rod is hinged to the end of the operating lever away from the limiting member, and the other end of the crank connecting rod is hinged to the position near the edge of the rotating surface of the wheel. The wheel is mounted on the rotating shaft and rotates coaxially with the shaft. The rotating surface of the wheel is parallel to the operating lever. The drive assembly is connected to the rotating shaft, and the rotating shaft has a first resistance strain gauge and a second resistance strain gauge on its sides in two mutually perpendicular directions, respectively. The control unit is electrically connected to the first resistance strain gauge and the second resistance strain gauge through a resistance measuring instrument. The wheel can be a ratchet with a pawl to achieve unidirectional rotation control.

[0088] In this embodiment, the drive assembly includes a first transmission gear, a second transmission gear, and a rotating motor; the transmission wheel is sleeved on the rotating shaft, and the second transmission gear is disposed on the movable end of the rotating motor;

[0089] The first transmission gear meshes with the second transmission gear.

[0090] In this embodiment, the operation process of the monitoring device is as follows:

[0091] Start the rotating motor, rotate the second transmission gear, which drives the first transmission gear and its shaft to rotate; during the rotation of the shaft, the rotating wheel also rotates, thereby causing displacement of the crank connecting rod; taking the figure as an example, when the rotating wheel rotates clockwise a certain distance, the crank connecting rod gradually moves away from the spring, that is, it pulls the operating lever downward, causing the spring to be compressed; while when the rotating wheel continues to rotate clockwise a certain distance, the crank connecting rod gradually moves closer to the spring, that is, it pushes the operating lever upward, causing the spring to be stretched.

[0092] In this embodiment, a torque measurement module is also included, which is mounted on the rotating shaft. Furthermore, the entire monitoring device can be mounted on the mounting bracket of the circuit breaker operating mechanism, achieving a non-intrusive monitoring design.

[0093] Please refer to Figures 3 to 5 Embodiment two of the present invention is as follows:

[0094] A method for real-time monitoring of the spring force of a circuit breaker operating mechanism, applied to a real-time monitoring device for the spring force of a circuit breaker operating mechanism according to Embodiment 1, includes the following steps:

[0095] S1. Start the drive assembly, drive the rotating wheel to rotate through the rotating shaft, so that the crank connecting rod pulls the operating lever, and the spring deforms;

[0096] In this embodiment, the operation process of the monitoring device is the same as that described in Embodiment 1, and will not be repeated here. During operation, the rotation amount of the rotating motor is specifically controlled.

[0097] S2. Calculate the first stress and the second stress on the first resistance strain gauge and the second resistance strain gauge respectively during the rotation of the shaft.

[0098] In this embodiment, step S2 includes:

[0099] S21. Use a resistance measuring instrument to measure the first resistance change and the second resistance change of the first resistance strain gauge and the second resistance strain gauge respectively during the rotation of the shaft.

[0100] S22. Taking the orientation of the first resistance strain gauge as the X direction and the orientation of the second resistance strain gauge as the Y direction, calculate the first stress and the second stress based on the changes in the first and second resistance values. The expressions are as follows:

[0101]

[0102]

[0103] Where, σ x For the first stress, σ y Δ represents the second stress, and R X For the first resistance change, ΔR y For the second resistance change, R X0 R is the initial resistance of the first resistance strain gauge. y0 Let E be the initial resistance of the second resistance strain gauge, E be the elastic modulus of the materials of the first and second resistance strain gauges, and K be the sensitivity coefficient of the first and second resistance strain gauges.

[0104] In this embodiment, combined with Figure 2 As shown, when facing the cross-section of the rotating shaft, the first resistance strain gauge is located in the horizontal right direction, which is the X direction, while the second resistance strain gauge is located in the vertical downward direction, which is the Y direction.

[0105] S3. Based on the first and second stresses, the magnitude and direction of the force on the spring are obtained.

[0106] In this embodiment, step S3 includes:

[0107] S31. Based on the first and second stresses, calculate the stress on the rotating shaft. The expression is as follows:

[0108]

[0109] S32. Based on the stress on the shaft, the torque of the shaft, and the distance from the shaft to the center of the wheel, calculate the radial force and circumferential force of the shaft. The expressions are as follows:

[0110] F r =σ m ;

[0111]

[0112] Among them, F r For radial force, F t R1 is the circumferential force, M is the torque of the rotating shaft, and R1 is the distance from the rotating shaft to the center of the wheel.

[0113] S33. Calculate the magnitude and direction of the force on the spring based on the radial force and the circumferential force.

[0114] The direction of the force on the spring is determined by the rotation angle of the rotating wheel. Step S33 includes:

[0115] S331. Obtain and calculate the angle between the radial force and the circumferential force, the expression of which is:

[0116]

[0117] S332. Calculate the rotation angle of the wheel based on the angle between the radial force and the circumferential force:

[0118] When ΔR X <0 and ΔR y <0 o'clock:

[0119] α = 90° - δ;

[0120] When ΔR X >0 and ΔR y <0 o'clock:

[0121] α = 90° + δ;

[0122] When ΔR X >0 and ΔR y >0:

[0123] α = 270° - δ;

[0124] When ΔR X <0 and ΔR y >0:

[0125] α = 270° + δ;

[0126] S333. Based on the rotation angle of the wheel, the direction of the force on the spring is obtained. When ΔR X When ΔR < 0, the spring is stretched; when ΔR < 0, the spring is stretched. X When the value is greater than 0, the spring is compressed.

[0127] In this embodiment, as Figure 5 As shown, the rotation angle of the wheel has a corresponding relationship in each of the four quadrants based on the angle between the radial force and the circumferential force. The quadrant in which the wheel is located indicates the position of the connection point between the crank connecting rod and the wheel after rotation. If the connection point is in the first or fourth quadrant relative to the wheel, it means that the crank push rod is pushing the operating lever and the spring is stretched. If the connection point is in the second or third quadrant, it means that the crank push rod is pulling the operating lever and the spring is compressed.

[0128] S334. Obtain and calculate the magnitude of the first angle between the radial force and the X direction, the expression of which is:

[0129] When ΔR y <0 o'clock:

[0130] θ = δ;

[0131] When ΔR y >0:

[0132] θ = 360 - δ;

[0133] S335. Based on the radial force and circumferential force, calculate the forces acting on the crank-connecting rod. The expression is as follows:

[0134]

[0135] S336. Based on the first included angle and the length of the crank-connecting rod, calculate the second included angle between the crank-connecting rod and the operating lever. The expression is as follows:

[0136]

[0137] In this embodiment, as shown in the figure, an equivalent schematic diagram is drawn of the relative position changes between the wheel, crank connecting rod and operating lever during operation, and the second included angle between the crank connecting rod and the operating lever can be calculated accordingly.

[0138] S337. Based on the first included angle, the second included angle, and the forces acting on the crank and connecting rod, calculate the force on the spring. The expression is as follows:

[0139]

[0140] In this embodiment, the magnitude and direction of the force on the spring can be monitored in real time through the above process, and based on this, it can be determined whether the spring has fatigue deformation and whether it can meet the usage requirements.

[0141] In summary, this invention provides a real-time monitoring device and method for the spring force of a circuit breaker operating mechanism. It features a transmission structure consisting of a rotating shaft, a rotating wheel, and a crank-connecting rod. A driving component drives the rotating shaft to rotate, which in turn drives the crank-connecting rod to pull the operating lever, causing the spring to deform under stress. The device eliminates the need to disassemble the operating mechanism during installation, resulting in a simple structure. The magnitude and direction of the spring force are obtained by analyzing the stress data from a first and second resistance strain gauge, providing a convenient and accurate way to monitor the spring force of the circuit breaker operating mechanism.

[0142] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent modifications made based on the content of the present invention specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A real-time monitoring device for spring force of a circuit breaker operating mechanism, the circuit breaker operating mechanism comprising a mounting frame, an operating rod, and a spring; the mounting frame is provided with a linear limiting through hole, the operating rod passes through the linear limiting through hole, one end of the operating rod is provided with a limiting member, the spring is sleeved on the operating rod, and the spring is clamped between the limiting member and the mounting frame, characterized in that, The monitoring device includes a monitoring terminal, a rotating wheel, a crank connecting rod, a rotating shaft, and a drive assembly; The crank connecting rod and the operating lever are located on the same plane. One end of the crank connecting rod is hinged to the end of the operating lever away from the limiting member. The other end of the crank connecting rod is hinged to the position near the edge of the rotating surface of the wheel. The wheel is disposed on the rotating shaft and rotates coaxially with the rotating shaft. The rotating surface of the wheel is parallel to the operating lever. The drive assembly is connected to the rotating shaft, and the rotating shaft is provided with a first resistance strain gauge and a second resistance strain gauge on its sides in two mutually perpendicular directions. The monitoring terminal is connected to the first resistance strain gauge and the second resistance strain gauge respectively; the monitoring terminal includes a resistance measuring instrument and a control unit.

2. The real-time monitoring device for spring force of a circuit breaker operating mechanism according to claim 1, characterized in that, The drive assembly includes a first transmission gear, a second transmission gear, and a rotating motor; The first transmission gear is sleeved on the rotating shaft, and the second transmission gear is disposed on the movable end of the rotating motor; The first transmission gear meshes with the second transmission gear.

3. The real-time monitoring device for spring force of a circuit breaker operating mechanism according to claim 1, characterized in that, It also includes a torque measurement module, which is mounted on the rotating shaft and is used to acquire the torque of the rotating shaft.

4. The real-time monitoring device for spring force of a circuit breaker operating mechanism according to claim 1, characterized in that, The rotating wheel is a ratchet, and a pawl is provided on the mounting bracket at a position close to the circumferential side of the rotating wheel.

5. A method for real-time monitoring of the spring force of a circuit breaker operating mechanism, applied to the real-time monitoring device for the spring force of a circuit breaker operating mechanism as described in any one of claims 1 to 4, characterized in that, Including the following steps: S1. Start the drive assembly, drive the rotating wheel to rotate through the rotating shaft, so that the crank connecting rod pulls the operating lever, and the spring deforms; S2. Calculate the first stress and the second stress on the first resistance strain gauge and the second resistance strain gauge respectively during the rotation of the shaft. S3. Based on the first stress and the second stress, the magnitude and direction of the force on the spring are obtained.

6. The method for real-time monitoring of spring force in a circuit breaker operating mechanism according to claim 5, characterized in that, Step S2 includes: S21. Use a resistance measuring instrument to measure the first resistance change and the second resistance change of the first resistance strain gauge and the second resistance strain gauge respectively during the rotation of the shaft; S22. Taking the orientation of the first resistance strain gauge as the X direction and the orientation of the second resistance strain gauge as the Y direction, calculate the first stress and the second stress based on the changes in the first and second resistance values. The expressions are as follows: ； ； in, For the first stress, For the second stress, R X For the change in the first resistance value, R y For the second resistance change, R X0 R is the initial resistance of the first resistance strain gauge. y0 Let E be the initial resistance of the second resistance strain gauge, E be the elastic modulus of the materials of the first and second resistance strain gauges, and K be the sensitivity coefficient of the first and second resistance strain gauges.

7. The method for real-time monitoring of spring force in a circuit breaker operating mechanism according to claim 6, characterized in that, Step S3 includes: S31. Based on the first stress and the second stress, calculate the stress on the rotating shaft, the expression of which is: ； S32. Based on the stress on the shaft, the torque of the shaft, and the distance from the shaft to the center of the wheel, calculate the radial force and circumferential force of the shaft. The expressions are as follows: ； ； in, For the radial force, M is the circumferential force, M is the torque of the rotating shaft, and R1 is the distance from the rotating shaft to the center of the wheel. S33. Calculate the magnitude and direction of the force on the spring based on the radial force and the circumferential force.

8. The method for real-time monitoring of spring force in a circuit breaker operating mechanism according to claim 7, characterized in that, Step S33 includes: S331. Obtain and calculate the angle between the radial force and the circumferential force, the expression of which is: ； S332. Calculate the rotation angle of the wheel based on the angle between the radial force and the circumferential force: when hour: ； when hour: ； when hour: ； when hour: ； S333. Based on the rotation angle of the rotating wheel, the direction of the force on the spring is obtained. When, the spring is stretched, when At that time, the spring is compressed.

9. A method for real-time monitoring of spring force in a circuit breaker operating mechanism according to claim 7, characterized in that, Step S33 further includes: S334. Obtain and calculate the magnitude of the first angle between the radial force and the X direction, the expression of which is: when hour: ； when hour: ； S335. Based on the radial force and the circumferential force, calculate the force acting on the crank connecting rod, the expression of which is: ； S336. Based on the first included angle and the length of the crank connecting rod, calculate the second included angle between the crank connecting rod and the operating lever, the expression of which is as follows: ； S337. Based on the first included angle, the second included angle, and the force acting on the crank connecting rod, calculate the force on the spring, the expression of which is: 。

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