Circuit breaker operating mechanism load simulation device and test method

Abstract

The invention discloses a circuit breaker operating mechanism load simulation device and a test method. The load simulation device comprises an eccentric wheel, a motor, an output sliding block, a force sensor, a displacement sensor and a bottom plate. An adjusting sliding block is arranged on the surface of the eccentric wheel in the radius direction of the eccentric wheel and can move in the radius direction of the eccentric wheel. The output shaft is connected with an eccentric shaft of the eccentric wheel and drives the eccentric wheel to rotate; a connecting rod is rotationally connected between the output sliding block and the adjusting sliding block, and the eccentric wheel rotates to drive the output sliding block to reciprocate; the force sensor is connected with the output sliding block and transmits force to a load part; the displacement sensor is used for detecting the displacement of the output sliding block; the eccentric wheel, the motor and the displacement sensor are arranged on the top of the bottom plate. The load simulation device is high in flexibility and can simulate a real mechanical load.

Description

Technical Field

[0001] This invention relates to the field of high-voltage electrical equipment technology, and more specifically to a load simulation device and testing method for a circuit breaker operating mechanism. Background Technology

[0002] In the research and development, factory testing, and reliability assessment of circuit breaker operating mechanisms, it is necessary to apply mechanical loads (such as spring force, friction force, and inertial force) that simulate actual operation. Current mainstream methods have significant shortcomings: 1. Physical load method: This method directly uses springs, counterweights, or pneumatic devices as the load. The disadvantages are that the load characteristics are fixed and singular, changing and adjusting them is time-consuming and labor-intensive, it cannot simulate complex or nonlinear load curves, and it occupies a large space.

[0003] 2. Traditional electric load method: This method uses a linear motor or electric cylinder to directly push and pull. Although programmable, its force-displacement characteristics are a simple linear relationship, which cannot reproduce the nonlinear mechanical characteristics generated by the linkage and crank arm conversion of a real circuit breaker mechanism, resulting in insufficient simulation realism.

[0004] Therefore, developing a highly flexible circuit breaker operating mechanism load simulation device and testing method that can simulate real mechanical loads is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the present invention provides a highly flexible circuit breaker operating mechanism load simulation device and testing method that can simulate real mechanical loads.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A circuit breaker operating mechanism load simulation device, comprising: An eccentric wheel, wherein an adjusting slider is provided on the surface of the eccentric wheel along its radial direction, and the adjusting slider is movable in the radial direction of the eccentric wheel; The motor has its output shaft connected to the eccentric shaft of the eccentric wheel and drives the eccentric wheel to rotate. An output slider is rotatably connected to the adjustment slider by a connecting rod. The eccentric wheel rotates, causing the output slider to reciprocate. A force sensor is connected to the output slider and transmits force to the load part; A displacement sensor is used to detect the displacement of the output slider; The base plate, the eccentric wheel, the motor and the displacement sensor are all located on the top of the base plate.

[0007] The beneficial effects of adopting the above technical solution are that, through mechanical structures such as eccentric wheels, adjusting sliders, connecting rods, and output sliders, combined with motor drive and sensor feedback, a true simulation of the nonlinear load characteristics of the circuit breaker operating mechanism is achieved, replacing the traditional single load or simple electric load method, and improving the authenticity and flexibility of the test.

[0008] Preferably, the eccentric wheel has a groove along its radial direction, and a lead screw is installed in the groove, with both ends of the lead screw rotatably connected to the end of the groove; the adjusting slider is threadedly connected to the lead screw. By providing a groove and lead screw structure on the eccentric wheel, stepless and smooth movement of the adjusting slider in the radial direction of the eccentric wheel is achieved, facilitating precise adjustment of the eccentricity and adapting to the load characteristics requirements of different types of circuit breakers.

[0009] Preferably, the end of the lead screw away from the eccentric wheel passes through the end of the slide groove and is equipped with a knob. The knob at the end of the lead screw facilitates quick and manual adjustment of the eccentricity, simplifying operation.

[0010] Preferably, a nut is provided at the end of the lead screw with the knob, and an elastic tapered sleeve is provided at the connection between this end of the lead screw and the end of the slide groove. The nut presses against the elastic tapered sleeve and locks the lead screw. The locking mechanism, which uses a nut and an elastic tapered sleeve, provides reliable rigid locking after adjustment, preventing slippage under high load conditions and ensuring the stability and safety of the device operation.

[0011] Preferably, the surface of the eccentric wheel is marked with scale lines along the direction of the slide groove. The scale lines on the surface of the eccentric wheel facilitate intuitive reading of the eccentricity value, improve adjustment accuracy and ease of operation, and avoid repeated measurements and adjustments.

[0012] Preferably, a cylindrical guide rail is provided on the top of the base plate, and the interior of the guide rail is hollow, with the output slider slidably disposed within the guide rail. The cylindrical guide rail accommodates the output slider, providing stable guidance and support, and ensuring the accuracy of the linear reciprocating motion of the output slider.

[0013] Preferably, the sidewall of the guide rail is provided with a connecting groove along its length, and the end of the connecting rod passes through the connecting groove and connects to the output slider.

[0014] Preferably, the eccentric shaft of the eccentric wheel is connected to a rotary encoder, which is mounted on the top of the base plate. The rotary encoder detects the rotation angle of the eccentric wheel in real time, providing high-precision angle feedback to the controller.

[0015] Preferably, a controller is also provided on the top of the base plate, and the motor, displacement sensor, force sensor, and rotary encoder are all connected to the controller. The controller integrates the control of each sensor and the motor, realizing fully closed-loop intelligent control and improving system response speed and control accuracy.

[0016] A test method for a circuit breaker operating mechanism load simulation device includes the following test steps: S1. Before testing, set the target load model in the host computer and download the model parameters to the controller; S2, During testing, the motor drives the eccentric wheel to rotate, while the output slider reciprocates within the guide rail, applying force to the load area via a force sensor; the controller reads the slider position x and eccentric wheel angle θ from the displacement sensor and rotary encoder in real time, and calculates the target force F in real time based on the model. target Simultaneously, the actual force F fed back by the force sensor is read. actual ; S3 calculates the actual force F using a high-speed PID control algorithm. actual With target force F target The difference between them is then calculated, and the controller dynamically adjusts the motor's output torque accordingly, so that F actual Track quickly and accurately Ftarget This generates the required simulated load on the circuit breaker operating mechanism.

[0017] As can be seen from the above technical solution, compared with the prior art, the present invention discloses a circuit breaker operating mechanism load simulation device and testing method, the beneficial effects of which are: (1) The eccentricity can be steplessly adjusted by the lead screw, which can accurately match the mechanism parameters of different types of circuit breakers and has strong versatility; and it can reproduce the nonlinear displacement-force conversion relationship of the circuit breaker operating mechanism, which is impossible for a pure linear motor, greatly improving the simulation confidence. (2) A motor provides controllable power input, an adjustable eccentric wheel-linkage mechanism reproduces the real nonlinear motion and force conversion relationship, and multiple sensors realize closed-loop feedback, which improves the accuracy of control.

[0018] (3) This device can replace a variety of physical loads, greatly shorten the test preparation and switching time, realize "one machine for multiple uses" and reduce test costs. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0020] Figure 1 A schematic diagram of the load simulation device provided by the present invention; Figure 2 This is a front view of the load simulation device provided by the present invention; Figure 3 Provided by the present invention Figure 2 Enlarged view of the structure at point A in the middle; Figure 4 An internal cross-sectional view of the load simulation device provided by the present invention; Figure 5 Provided by the present invention Figure 4 Enlarged view of the structure at point B; Figure 6 The control principle block diagram of the load simulation device test method provided by the present invention.

[0021] in, 1-Eccentric wheel; 2-Adjusting slider; 3-Motor; 4-Output slider; 5-Connecting rod; 6-Force sensor; 7-Displacement sensor; 8-Base plate; 9-Lead screw; 10-Fixed support; 11-Knob; 12-Nut; 13-Elastic cone sleeve; 14-Guide rail; 15-Rotary encoder; 16-Controller; 17-Scale line. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] This invention discloses a load simulation device for a circuit breaker operating mechanism, comprising: An eccentric wheel 1 has an adjusting slider 2 on its surface along its radial direction, and the adjusting slider 2 can move in the radial direction of the eccentric wheel 1. Motor 3 has its output shaft connected to the eccentric shaft of eccentric wheel 1, and drives eccentric wheel 1 to rotate; The output slider 4 is rotatably connected to the adjusting slider 2 by a connecting rod 5. The eccentric wheel 1 rotates, driving the output slider 4 to reciprocate. Force sensor 6 is connected to output slider 4 and transmits force to the load part; Displacement sensor 7 is used to detect the displacement of output slider 4; The base plate 8, eccentric wheel 1, motor 3, and displacement sensor 7 are all located on the top of the base plate 8.

[0024] Force sensor 6 is connected in series between output slider 4 and the load section to directly measure the actual applied load force. Force sensor 6 is an S-type load cell with internal and external threads machined at both ends, used directly as a connecting rod. Displacement sensor 7 is arranged parallel to guide rail 14 to measure the linear displacement of output slider 4 in real time. Displacement sensor 7 can be a pull-string sensor, with the pull-string connected to output slider 4 and moving with output slider 4 to measure displacement. The pull-string sensor is connected to base plate 8 via bracket.

[0025] In one embodiment, motor 3 is a servo motor, and the output shaft of the servo motor is directly or through a reducer connected to the eccentric wheel 1.

[0026] In one embodiment, the eccentric wheel 1 has a groove along its radial direction, and a lead screw 9 is installed in the groove, with both ends of the lead screw 9 rotatably connected to the end of the groove; the adjusting slider 2 is threadedly connected to the lead screw 9. The eccentric wheel 1 is supported by bearings on two fixed supports 10 on both sides, and the fixed supports 10 are fixed to the top of the base plate 8. In one embodiment, the end of the lead screw 9 away from the eccentric wheel 1 passes through the end of the groove and is provided with a knob 11. By rotating the knob 11, the lead screw 9 can be rotated, thereby causing the adjusting slider 2 to move along the radial direction of the eccentric wheel 1, realizing stepless continuous adjustment of the eccentricity e.

[0027] In one embodiment, a nut 12 is provided at one end of the lead screw 9 where the knob 11 is located, and an elastic tapered sleeve 13 is provided at the connection between this end of the lead screw 9 and the end of the slide groove. The nut 12 presses against the elastic tapered sleeve 13 and locks the lead screw 9. The elastic tapered sleeve 13 and the nut 12 cooperate to form a locking mechanism. Tightening the nut 12 with a torque wrench causes the tapered sleeve to expand radially, simultaneously gripping the lead screw 9 and the eccentric wheel 1 body, achieving complete locking. After the adjusting slider 2 is adjusted to the correct position, a rigid lock is provided to ensure stability under high loads.

[0028] In one embodiment, the surface of the eccentric wheel 1 is marked with scale lines 17 along the direction of the groove. By observing the scale lines 17, the value of the eccentricity e can be easily determined.

[0029] In one embodiment, a cylindrical guide rail 14 is provided on the top of the base plate 8. The interior of the guide rail 14 is hollow, and the output slider 4 is slidably disposed within the guide rail 14. One end of the connecting rod 5 is hinged to the adjusting slider 2, and the other end is hinged to the output slider 4 moving within the cylindrical guide rail 14, converting the rotational motion of the eccentric wheel 1 into the linear motion of the output slider 4. The end of the output slider 4 is provided with a standard interface (such as a threaded hole) for connecting the force sensor 6.

[0030] In one embodiment, the sidewall of the guide rail 14 is provided with a connecting groove along its length, and the end of the connecting rod 5 passes through the connecting groove and connects to the output slider 4.

[0031] In one embodiment, the eccentric shaft of the eccentric wheel 1 is connected to a rotary encoder 15, which is located on the top of the base plate 8. The rotary encoder 15 can accurately measure the rotation angle of the eccentric wheel 1; the rotary encoder 15 is an absolute encoder, mounted via a flange, and connected to the eccentric wheel shaft using a small perforated coupling.

[0032] In one embodiment, a controller 16 is also provided on the top of the base plate 8, and the motor 3, displacement sensor 7, force sensor 6, and rotary encoder 15 are all connected to the controller 16. The controller 16 receives signals from all sensors (i.e., displacement sensor, force sensor, and rotary encoder) and sends real-time torque or position commands to the servo motor according to a preset load model, forming a highly dynamic closed-loop control.

[0033] A test method for a circuit breaker operating mechanism load simulation device includes the following test steps: S1. Before testing, set the target load model in the host computer and download the model parameters to the controller; S2, during testing, motor 3 drives eccentric wheel 1 to rotate, while output slider 4 reciprocates within guide rail 14, and applies force to the load part through force sensor 6; controller 16 reads the slider position x and eccentric wheel angle θ fed back by displacement sensor 7 and rotary encoder 15 in real time, and calculates the target force F in real time according to the model. target Simultaneously, the actual force F fed back by the force sensor is read. actual ; S3 calculates the actual force F using a high-speed PID control algorithm. actual With target force F target The difference between them is then calculated, and the controller dynamically adjusts the motor's output torque accordingly, so that F actual Quickly and accurately track F target This generates the required simulated load on the circuit breaker operating mechanism.

[0034] In addition to performing the aforementioned simulated loads, this simulation device can be programmed to automatically run tens of thousands of cycles for life testing. Alternatively, by modifying model parameters, it can instantaneously simulate fault conditions such as "spring breakage" (sudden drop in stiffness) and "lubrication failure" (sudden increase in friction), recording the mechanism's response for fault diagnosis research. Furthermore, different load curves (such as springs with different stiffnesses, different damping coefficients, and nonlinear friction) can be set and switched via a host computer without replacing any physical components, achieving "one-click switching" of test conditions. The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0035] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A load simulation device for a circuit breaker operating mechanism, characterized in that, include: An eccentric wheel, wherein an adjusting slider is provided on the surface of the eccentric wheel along its radial direction, and the adjusting slider is movable in the radial direction of the eccentric wheel; The motor has its output shaft connected to the eccentric shaft of the eccentric wheel and drives the eccentric wheel to rotate. An output slider is rotatably connected to the adjustment slider by a connecting rod. The eccentric wheel rotates, causing the output slider to reciprocate. A force sensor is connected to the output slider and transmits force to the load part; A displacement sensor is used to detect the displacement of the output slider; The base plate, the eccentric wheel, the motor and the displacement sensor are all located on the top of the base plate.

2. The circuit breaker operating mechanism load simulation device according to claim 1, characterized in that, The eccentric wheel has a groove along its radial direction, and a lead screw is installed in the groove. The two ends of the lead screw are rotatably connected to the ends of the groove. The adjusting slider is threadedly connected to the lead screw.

3. The circuit breaker operating mechanism load simulation device according to claim 2, characterized in that, The end of the lead screw away from the eccentric wheel passes through the end of the slide groove and is equipped with a knob.

4. The circuit breaker operating mechanism load simulation device according to claim 3, characterized in that, The lead screw has a nut at one end with a knob, and an elastic tapered sleeve is provided at the connection between this end of the lead screw and the end of the slide groove. The nut presses the elastic tapered sleeve and locks the lead screw.

5. A circuit breaker operating mechanism load simulation device according to claim 4, characterized in that, The surface of the eccentric wheel is marked with scale lines along the direction of the groove.

6. The circuit breaker operating mechanism load simulation device according to claim 1, characterized in that, The top of the base plate is provided with a cylindrical guide rail, the inside of which is hollow, and the output slider is slidably disposed within the guide rail.

7. A load simulation device for a circuit breaker operating mechanism according to claim 6, characterized in that, The sidewall of the guide rail is provided with a connecting groove along its length, and the end of the connecting rod passes through the connecting groove and connects to the output slider.

8. The circuit breaker operating mechanism load simulation device according to claim 1, characterized in that, The eccentric shaft of the eccentric wheel is connected to a rotary encoder, which is located on the top of the base plate.

9. A load simulation device for a circuit breaker operating mechanism according to claim 8, characterized in that, A controller is also provided on the top of the base plate, and the motor, displacement sensor, force sensor and rotary encoder are all connected to the controller.

10. A test method for a circuit breaker operating mechanism load simulation device as described in any one of claims 1-9, characterized in that, The test steps include the following: S1. Before testing, set the target load model in the host computer and download the model parameters to the controller; S2, During testing, the motor drives the eccentric wheel to rotate, while the output slider reciprocates within the guide rail, applying force to the load area via a force sensor; the controller reads the slider position x and eccentric wheel angle θ from the displacement sensor and rotary encoder in real time, and calculates the target force F in real time based on the model. target Simultaneously, the actual force F fed back by the force sensor is read. actual ; S3 calculates the actual force F using a high-speed PID control algorithm. actual With target force F target The difference between them is then calculated, and the controller dynamically adjusts the motor's output torque accordingly, so that F actual Quickly and accurately track F target This generates the required simulated load on the circuit breaker operating mechanism.

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