Test system with protection function for frequency converter maintenance

Abstract

The invention discloses a frequency converter maintenance test system with a protection function, which belongs to the technical field of frequency converter testing and comprises a detection seat, a simulation unit for simulating actual working conditions of a frequency conversion control panel is arranged on the detection seat, and a detection mechanism for detecting a diode in the frequency conversion control panel is further arranged on the detection seat. Through dynamic cooperation of the polarization assembly and the rotary simulation disc, the vibration direction of the vibration source can be flexibly adjusted, so that a multi-dimensional vibration scene possibly encountered in actual work of the frequency conversion control panel is covered, and the problem that vibration source simulation is lacked in a traditional frequency converter testing process is solved; an elastic supporting environment of actual installation is simulated through the air bag spring suspension, vibration energy emission distortion caused by rigid fixation is avoided, the accuracy of a large-capacitance vibration fatigue test is improved, automatic step-by-step wiring operation of detection is achieved through cooperation of the detection driving assembly and the universal test meter, and the overall detection wiring efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of frequency converter testing, and particularly to a testing system for frequency converter maintenance with a protection function. Background Art

[0002] A frequency converter mainly consists of a rectifier, a filter, an inverter, a braking unit, a driving unit, a detection unit, a microprocessing unit, etc. Its main function is to adjust the speed of the motor. The output power supply voltage and frequency after inversion by the intermediate capacitor are adjusted by turning on and off the internal IGBT, and adjusted to the required output power supply according to the actual requirements of the motor.

[0003] Currently, when performing maintenance tests on frequency converters, it is often necessary to use a multimeter to detect the wiring of its input terminals (RST) and output terminals (UVW). During the detection process, by changing the positive and negative poles corresponding to the test leads, the above-mentioned wiring detection is repeated again, so as to know whether multiple rectifier diodes and inverter diodes on the frequency converter control board are intact; However, such a wiring method highly depends on the manual operation of maintenance personnel, cannot perform rapid testing, and has high requirements for the wiring experience of maintenance personnel. Moreover, in the actual use process of the frequency converter control board, it is often set near the controlled motor and is affected by the vibration of the load driven by the motor. It is easy to cause the soldering joints of large circuit components, namely large capacitors, inside to become desoldered, reducing the bootstrap voltage. As a result, under the action of electrical pulses, the DC voltage of the inverter circuit changes the output frequency-converted alternating current, and the current weakens, making it impossible to start the load. The existing maintenance tests are all carried out on a steadily placed detection device, unable to actually simulate the actual working conditions of the frequency converter control board, resulting in a decrease in the accuracy of experimental data at the test site and an increase in test errors. Summary of the Invention

[0004] The purpose of the present invention is to solve the problems existing in the prior art, and to propose a testing system for frequency converter maintenance with a protection function.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solution: A testing system for frequency converter maintenance with a protection function includes a detection seat for testing a frequency conversion control board. The top of the detection seat clamps the frequency conversion control board through a clamping component. A simulation unit for simulating the actual working conditions of the frequency conversion control board is arranged on the detection seat. The simulation unit consists of a balance adjustment mechanism and a vibration simulation mechanism. A detection mechanism for detecting the internal diodes of the frequency conversion control board is also arranged on the detection seat; The vibration simulation mechanism is composed of a buffer component and a vibration component, the buffer component is composed of an airbag spring and a vibration detection frame, the vibration detection frame is fixed to the airbag spring through a vibration beam, the vibration beam is installed on the top of the detection seat through the airbag spring, the vibration component includes a simulation seat arranged on both sides of the vibration detection frame, the simulation seat is clamped with two symmetrically arranged simulation disks through a positioning component, and a polarization component is fixedly installed on the top of the simulation disk; The detection mechanism comprises a multi-function test meter and an extended electric pen arranged on a vibration detection frame. The vibration detection frame controls the extended electric pen through a detection drive component, and the extended electric pen is electrically connected to the multi-function test meter through a wire.

[0006] Preferably, the clamping assembly comprises a clamping bolt and a clamping wedge, and an anti-debonding layer is obliquely provided on the contact surface between the clamping wedge and the frequency conversion control board.

[0007] Preferably, the balance adjustment mechanism comprises balance rods arranged on both sides of the vibration detection frame, the balance rods are threadedly connected to balance knobs through thread grooves, and the balance rods are slidably connected to balance weight boxes through smooth surfaces.

[0008] Preferably, the positioning assembly includes a positioning pin plugged into the simulation disk, and the positioning pin is slidably connected to the simulation seat via a compression spring.

[0009] Preferably, the simulation disk is rotatably connected to the simulation seat via a positioning shaft, a positioning hole is provided at the bottom of the simulation disk, and the simulation seat is engaged with the positioning hole via a positioning pin to position the rotation direction of the simulation disk.

[0010] Preferably, the polarization component includes a servo motor installed on the top of the simulation disk and starts and stops synchronously. A polarization turntable is fixedly installed on the output end of the servo motor. The servo motor changes the swing direction of the polarization turntable through the simulation disk, thereby changing the swing direction of the vibration detection frame to simulate the actual working condition of the frequency conversion control board.

[0011] Preferably, the detection drive assembly comprises a stepper motor arranged on the vibration detection frame, the stepper motor is connected to a driving screw through a bevel gear set, and the driving screw is movably connected to a detection control arm.

[0012] Preferably, the detection control arm is plugged into the extension electric pen through a plug hole, and a semi-driving sleeve drivingly connected to the driving screw is provided on the top of the detection control arm.

[0013] Preferably, a transverse sliding bar movably connected to the detection control arm is fixedly installed in the vibration detection frame, a detection positioning groove for the detection control arm to rotate is opened on the vibration detection frame, a permanent magnet strip for attracting the transverse sliding bar is fixed on the vibration detection frame, and a detection positioning electromagnet is arranged at the bottom of the vibration detection frame.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. Through the dynamic cooperation between the polarization component and the rotating simulation disk, the vibration direction of the vibration source can be flexibly adjusted, so as to cover the multi-dimensional vibration scenarios that may be encountered in the actual operation of the frequency conversion control board, solve the problem of lack of vibration source simulation in the traditional frequency converter testing process, and simulate the elastic support environment of the actual installation through the airbag spring suspension, avoiding the distortion of vibration energy emission caused by rigid fixation, and improving the accuracy of the vibration fatigue test of large capacitors.

[0015] 2. By driving the extension electric pen with a stepping motor, collision-free touching of the densely arranged detection contacts is realized, which is suitable for the detection of micro terminals of the frequency conversion board. By controlling the combination switching of the extension electric pens and cooperating with the range switching of the universal test meter, the static parameters of the rectifier bridge stack and the inverter IGBT module can be quickly tested, and the charge and discharge characteristics of the electrolytic capacitor can be detected, which can timely remind the maintenance personnel to check whether the capacitor is de-soldered due to the vibration environment.

[0016] 3. Through the detection drive component cooperating with the universal test meter, the automatic wiring operation of the detection is realized, and through the detection positioning electromagnet, precise rotation control of the detection control arm arriving at the detection position can be carried out, so that during the subsequent rotation of the drive lead screw driven by the stepping motor, the other extension electric pens are continuously driven, achieving the effect of stepwise controlling the extension electric pens, thus eliminating the need for maintenance personnel to perform manual wiring, reducing the requirement for the wiring experience of maintenance personnel, and improving the overall detection wiring efficiency. Description of the Drawings

[0017] Figure 1 Schematic diagram of the overall structure of the test system for maintaining a frequency converter with a protection function proposed by the present invention Figure 1 ; Figure 2 For the present invention Figure 1 Enlarged view of the structure at position A; Figure 3 Schematic diagram of the overall structure of the test system for maintaining a frequency converter with a protection function proposed by the present invention Figure 2 ; Figure 4 For the present invention Figure 3 Enlarged view of the structure at position B; Figure 5 Schematic diagram of the internal structure of the cross-section of the test system for maintaining a frequency converter with a protection function proposed by the present invention; Figure 6 Overall structure assembly view of the test system for maintaining a frequency converter with a protection function proposed by the present invention; Figure 7Schematic structural diagram of the positioning component in the test system for the maintenance of an inverter with a protection function proposed by the present invention; Figure 8 Schematic structural diagram of the detection and drive component in the test system for the maintenance of an inverter with a protection function proposed by the present invention.

[0018] Reference numerals: 1, detection base; 11, airbag spring; 2, frequency conversion control board; 3, vibration detection frame; 31, vibration cross beam; 32, simulation base; 321, positioning pin; 322, compression spring; 33, simulation disk; 34, servo motor; 341, polarization turntable; 35, detection positioning groove; 36, permanent magnet bar; 37, detection positioning electromagnet; 4, universal test meter; 5, extension electric pen; 6, clamping bolt; 61, clamping wedge; 7, balance rod; 71, balance knob; 72, balance weight box; 8, stepping motor; 81, bevel gear set; 82, drive lead screw; 83, detection control arm; 831, half drive sleeve; 9, horizontal slide bar. Detailed implementation manners

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0020] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "top / bottom end", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0021] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "provided with", "sheathed / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0022] Example, refer to Figures 1 to 8, a test system for the maintenance of a frequency converter with a protection function, including a detection seat 1 for testing the frequency conversion control board 2. The top of the detection seat 1 clamps the frequency conversion control board 2 through a clamping component. The detection seat 1 is provided with a simulation unit for simulating the actual working conditions of the frequency conversion control board 2. The simulation unit consists of a balance adjustment mechanism and a vibration simulation mechanism. The detection seat 1 is also provided with a detection mechanism for detecting the internal diodes of the frequency conversion control board 2.

[0023] Further, the clamping component includes a clamping bolt 6 and a clamping wedge 61. The contact surface between the clamping wedge 61 and the frequency conversion control board 2 is inclined with an anti-debonding layer. The clamping wedge 61 and the vibration detection frame 3 provide clamping on both sides of the frequency conversion control board 2, so as to stably clamp the frequency conversion control board 2 during the simulation test, and avoid the disconnection at the detection point of the extension electric pen 5 due to the shaking of the frequency conversion control board 2 during the test. Further, the balance adjustment mechanism includes balance rods 7 arranged on both sides of the vibration detection frame 3. The balance rods 7 are threadedly connected with balance knobs 71 through threaded grooves. The balance rods 7 are slidably connected with balance weight boxes 72 through smooth surfaces. Thus, based on the bias setting of the large capacitor during the test of the frequency conversion control board 2, the counterweight on the other side can be adjusted in time to ensure that during the test, the overall center of gravity formed by the vibration detection frame 3 and the frequency conversion control board 2 is located in the geometric central area of the plate, and to avoid the deviation of the actual vibration center of gravity of the plate during the subsequent vibration simulation due to the deviation of the center of gravity of the plate when clamped by the clamping component, which increases the test error. It should be noted that: there are large capacitors and wiring side plates extending outward on the frequency conversion control board 2, and the wiring side plates crimp the wires in the form of screw crimping. Both the large capacitors and the wiring side plates are conventional designs on the existing frequency conversion control board 2, which will not be elaborated here. And when the frequency conversion control board 2 is detected, detection contacts are pre-crimped on the wiring side plates so that they can contact the pen tip part of the extension electric pen 5 to reflect the usage conditions of the rectifier diodes and inverter diodes on the frequency conversion control board 2 in real time.

[0024] As Figures 1 to 4 shown, the vibration simulation mechanism consists of a buffer component and a vibration component. The buffer component consists of an airbag spring 11 and a vibration detection frame 3. The vibration detection frame 3 is fixed to the airbag spring 11 through a vibration cross beam 31. The vibration cross beam 31 is installed on the top of the detection seat 1 through the airbag spring 11. The vibration component includes simulation seats 32 arranged on both sides of the vibration detection frame 3. The simulation seats 32 are snap-connected with two symmetrically arranged simulation disks 33 through positioning components. Polarization components are fixedly installed on the tops of the simulation disks 33. Further, as Figure 7As shown, the positioning assembly includes a positioning pin 321 plugged into the simulation disk 33, the positioning pin 321 is slidably connected to the simulation seat 32 through a compression spring 322, the simulation disk 33 is rotatably connected to the simulation seat 32 through a positioning shaft, a positioning hole is provided at the bottom of the simulation disk 33, and the simulation seat 32 is engaged with the positioning hole through the positioning pin 321, so as to position the rotation direction of the simulation disk 33; Furthermore, the polarization assembly includes a servo motor 34 installed on the top of the simulation disk 33 and started and stopped synchronously, and a polarization turntable 341 is fixedly installed at the output end of the servo motor 34. The servo motor 34 changes the swing direction of the polarization turntable 341 through the simulation disk 33, thereby changing the swing direction of the vibration detection frame 3, simulating the actual working condition of the frequency conversion control board 2; It should be noted that: after the frequency conversion control board 2 is installed on the vibration detection frame 3, the simulation disk 33 can be driven to vibrate through the polarization component, thereby simulating in real time the vibration environment that the frequency conversion control board 2 is subjected to when it is actually set near the motor load, and the vibration detection frame 3 is suspended by the airbag spring 11, so that the vibration detection frame 3 can be slightly deformed under the vibration simulation of the simulation disk 33, and then the frequency conversion control board 2 in the vibration simulation process, synchronously fluctuates with the vibration direction of the vibration source, achieving the effect of highly simulating its actual working condition; A further advantage of adopting the above method is that when the frequency conversion control board 2 is actually working, the vibration direction it is subjected to may come from various directions. When testing it, the swing direction of the polarization turntable 341 can be changed by coordinating the rotation of the simulation disk 33 through the positioning component, and the vibration direction of the simulation disk 33 is changed by transmitting the changed vibration source influence from the simulation disk 33 to the vibration detection frame 3, thereby adjusting the vibration direction of the simulation disk 33 in real time, so that the vibration source simulated during the test is consistent with the vibration source when the frequency conversion control board 2 is actually working, so that the experimental data of the test can be based on the actual working conditions of the frequency conversion control board 2, thereby improving the accuracy of the experimental data.

[0025] like Figures 1 to 5 As shown, the detection mechanism includes a multi-function test meter 4 and an extended electric pen 5 arranged on a vibration detection frame 3. The vibration detection frame 3 controls the extended electric pen 5 through a detection drive component, and the extended electric pen 5 is electrically connected to the multi-function test meter 4 through a wire.

[0026] Furthermore, if Figure 6 and Figure 8 As shown, the detection drive assembly includes a stepper motor 8 disposed on the vibration detection frame 3, the stepper motor 8 is connected to a driving screw 82 through a bevel gear set 81, and the driving screw 82 is movably connected to a detection control arm 83; Furthermore, the detection control arm 83 is plugged into the extension electric pen 5 through the plug hole, and a semi-driving sleeve 831 is provided on the top of the detection control arm 83 and is transmission-connected to the driving screw 82; Furthermore, a horizontal sliding rod 9, which is fixedly installed in the vibration detection frame 3 and is movably connected to the detection control arm 83, is provided. A detection positioning groove 35 for the rotation of the detection control arm 83 is formed in the vibration detection frame 3. A permanent magnet strip 36 for attracting the horizontal sliding rod 9 is fixed on the vibration detection frame 3. A detection positioning electromagnet 37 is arranged at the bottom of the vibration detection frame 3. When the stepping motor 8 is started to drive the driving lead screw 82 to rotate, the detection control arm 83 can be attracted by the permanent magnet strip 36 to keep it in a horizontal state. When the detection control arm 83 moves to the corresponding detection positioning groove 35, the detection positioning electromagnet 37 is started to generate an attraction force greater than that of the permanent magnet strip 36 on the detection control arm 83, so that the detection control arm 83 rotates downward, and the extension electric pen 5 is brought into contact with the corresponding input end and output end of the frequency conversion control board 2 here, completing the driving process of the detection circuit connection; It should be noted that when it is necessary to detect the input end and output end of the frequency conversion control board 2, the extension electric pen 5 can be inserted on the detection control arm 83 and driven by the stepping motor 8 to drive the extension electric pen 5 to move to the detection contact piece to be contacted. Then, by starting the detection positioning electromagnet 37 to drive the extension electric pen 5 to rotate outward, the pen tip part of the extension electric pen 5 is connected to the corresponding wiring terminal on the frequency conversion control board 2, so that it is possible to obtain whether the rectifier diode or inverter diode corresponding to the wiring terminal of the frequency conversion control board 2 here and the large capacitor are damaged according to the reading on the universal test meter 4.

[0027] Based on the above, the specific detection process is as follows: When it is necessary to detect the quality of the rectifier diode corresponding to the input end of the frequency conversion control board 2, one extension electric pen 5 on one side is connected to the positive pole of the frequency conversion control board 2, and then one extension electric pen 5 on the other side is successively contacted with the three-phase power access points at the input end of the frequency conversion control board 2 (the input and output processes of the three-phase power at the input end and output end of the frequency conversion control board 2 are common input and output ends in existing frequency converters and will not be elaborated here). According to the reading on the universal test meter 4 after it is adjusted to the diode range, the quality of the corresponding three rectifier diodes can be obtained. Then, the extension electric pen 5 connected to the positive pole of the frequency conversion control board 2 is connected to the negative pole, and the above process of contacting the three-phase power access points is repeated to obtain the quality of the remaining corresponding three rectifier diodes.

[0028] When it is necessary to detect the quality of the reverse flow diode corresponding to the output end of the frequency conversion control board 2, one extension electric pen 5 on one side is connected to the positive pole of the frequency conversion control board 2, and then the other extension electric pen 5 on one side is successively contacted with the three-phase power output points at the output end of the frequency conversion control board 2 to obtain whether the corresponding three inverter diodes are damaged. Similarly, the extension electric pen 5 connected to the positive pole is changed to be connected to the negative pole, and the process of contacting the output points is repeated to obtain whether the remaining corresponding three inverter diodes are damaged.

[0029] During the detection process of whether the large capacitor on the variable frequency control board 2 is desoldered, the variable frequency control board 2 is charged, and after charging for a period of time, the multimeter 4 is changed to the current range to test the current at the three-phase power output points at the output end of the variable frequency control board 2. Thus, it can be known whether the capacitor is normally charged and discharged according to whether the current meets the motor load operation requirements, and whether the capacitor is damaged. Furthermore, the maintenance personnel can be timely reminded to check in time whether there is a desoldering fault of the large capacitor on the variable frequency control board 2.

[0030] Working principle: When the present invention performs maintenance and testing on the variable frequency control board 2, it is divided into a real working condition simulation process and a detection wiring driving process. The real working condition simulation process is as follows: after the variable frequency control board 2 is installed on the vibration detection frame 3, the simulation disk 33 is driven to vibrate by the polarization component, so as to real-time simulate the vibration environment suffered by the variable frequency control board 2 when it is actually working near the motor load. The vibration detection frame 3 is suspended by the airbag spring 11, so that the vibration detection frame 3 can undergo slight deformation under the vibration simulation of the simulation disk 33. Furthermore, during the vibration simulation process of the variable frequency control board 2, it fluctuates synchronously with the vibration direction of the vibration source, achieving the effect of highly simulating its actual working condition. Based on the above, when the variable frequency control board 2 is actually working, the vibration direction it receives may come from various directions. When testing it, the swing direction of the polarization turntable 341 can be changed by the positioning component cooperating with the rotation of the simulation disk 33, and the changed vibration source influence is transmitted from the simulation disk 33 to the vibration detection frame 3, so that its vibration direction changes accordingly. Thus, the vibration direction of the simulation disk 33 can be adjusted in real time, so that the simulated vibration source during testing conforms to the vibration source when the variable frequency control board 2 is actually working, and the experimental data obtained from the test is based on the actual working condition of the variable frequency control board 2, improving the accuracy of the experimental data.

[0031] The detection wiring driving process is as follows: when it is necessary to detect the input end and output end of the variable frequency control board 2, the extension electric pen 5 can be inserted into the detection control arm 83, and driven by the stepping motor 8, the extension electric pen 5 is driven to move to the detection contact piece to be contacted. Then, the extension electric pen 5 is driven to rotate outward by starting the detection positioning electromagnet 37, so that the pen tip part of the extension electric pen 5 is connected to the corresponding wiring terminal on the variable frequency control board 2. Thus, it can be known according to the indication on the multimeter 4 the rectifier diode or inverter diode corresponding to the wiring terminal of the variable frequency control board 2 here, and whether the large capacitor is damaged. Based on the above, the specific detection process is as follows: When it is necessary to detect the quality of the rectifier diodes corresponding to the input end of the variable-frequency control board 2, one extended electric pen 5 on one side is connected to the positive pole of the variable-frequency control board 2, and then one extended electric pen 5 on the other side is successively contacted with the three-phase power access points at the input end of the variable-frequency control board 2. By looking at the readings on the multimeter 4 after it is set to the diode range, the quality of the corresponding three rectifier diodes can be obtained. Then, the extended electric pen 5 connected to the positive pole of the variable-frequency control board 2 is connected to the negative pole, and the above process of contacting the three-phase power access points is repeated to obtain the quality of the remaining corresponding three rectifier diodes.

[0032] When it is necessary to detect the quality of the reverse-flow diodes corresponding to the output end of the variable-frequency control board 2, one extended electric pen 5 on one side is connected to the positive pole of the variable-frequency control board 2, and then another extended electric pen 5 on the same side is successively contacted with the three-phase power output points at the output end of the variable-frequency control board 2 to determine whether any of the corresponding three inverter diodes are damaged. Similarly, the extended electric pen 5 connected to the positive pole is then connected to the negative pole, and the process of contacting the output points is repeated to determine whether any of the remaining corresponding three inverter diodes are damaged.

[0033] During the detection process of whether the large capacitor on the variable-frequency control board 2 is desoldered, the variable-frequency control board 2 is charged. After charging for a period of time, the multimeter 4 is changed to the current range, and the current at the three-phase power output points at the output end of the variable-frequency control board 2 is measured. Thus, it can be determined whether the capacitor is charging and discharging normally and whether the capacitor is damaged based on whether the current meets the requirements of the motor load operation. Furthermore, maintenance personnel can be promptly reminded to check in a timely manner whether there is a fault with the desoldering of the large capacitor on the variable-frequency control board 2.

[0034] As described above, the above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and all should be covered by the protection scope of the present invention.

Claims

1. A test system for the maintenance of an inverter with a protection function, including a detection seat (1) for testing a variable frequency control board (2), characterized in that, The top of the detection seat (1) clamps the frequency conversion control board (2) through a clamping assembly, and the detection seat (1) is provided with a simulation unit for simulating the actual working condition of the frequency conversion control board (2), and the simulation unit is composed of a balance adjustment mechanism and a vibration simulation mechanism. The detection seat (1) is also provided with a detection mechanism for detecting the internal diode of the frequency conversion control board (2); The vibration simulation mechanism is composed of a buffer component and a vibration component, the buffer component is composed of an airbag spring (11) and a vibration detection frame (3), the vibration detection frame (3) is fixed to the airbag spring (11) via a vibration crossbeam (31), the vibration crossbeam (31) is installed on the top of the detection seat (1) via the airbag spring (11), the vibration component includes a simulation seat (32) arranged on both sides of the vibration detection frame (3), the simulation seat (32) is clamped with two symmetrically arranged simulation disks (33) via a positioning component, and a polarization component is fixedly installed on the top of the simulation disk (33); The detection mechanism comprises a multi-purpose test meter (4) and an extended electric pen (5) arranged on a vibration detection frame (3); the vibration detection frame (3) controls the extended electric pen (5) through a detection drive component; and the extended electric pen (5) is electrically connected to the multi-purpose test meter (4) through a wire.

2. The test system for frequency converter maintenance with protection function according to claim 1, characterized in that, The clamping assembly comprises a clamping bolt (6) and a clamping wedge (61), and an anti-debonding layer is obliquely provided on the contact surface between the clamping wedge (61) and the frequency conversion control board (2).

3. The test system for frequency converter maintenance with protection function according to claim 1, characterized in that, The balance adjustment mechanism comprises a balance rod (7) arranged on both sides of the vibration detection frame (3), the balance rod (7) being threadedly connected to a balance knob (71) via a thread groove, and the balance rod (7) being slidably connected to a balance weight box (72) via a smooth surface.

4. The test system for maintaining a frequency converter with a protection function according to claim 1, wherein, The positioning assembly comprises a positioning pin (321) plugged into the simulation disk (33); the positioning pin (321) is slidably connected to the simulation seat (32) via a compression spring (322).

5. The test system for inverter maintenance with protection function according to claim 4, characterized in that, The simulation disk (33) is rotatably connected to the simulation seat (32) via a positioning shaft. A positioning hole is provided at the bottom of the simulation disk (33). The simulation seat (32) is engaged with the positioning hole via a positioning pin (321) for positioning the rotation direction of the simulation disk (33).

6. The test system for inverter maintenance with protection function according to claim 1, characterized in that, The polarization component comprises a servo motor (34) mounted on the top of the simulation disk (33) and started and stopped synchronously, a polarization rotating disk (341) being fixedly mounted on the output end of the servo motor (34), and the servo motor (34) changes the swing direction of the polarization rotating disk (341) through the simulation disk (33), thereby changing the swing direction of the vibration detection frame (3), simulating the actual working condition of the frequency conversion control board (2).

7. The test system for frequency converter maintenance with protection function according to claim 1, characterized in that, The detection drive assembly comprises a stepper motor (8) arranged on a vibration detection frame (3); the stepper motor (8) is transmission-connected to a driving screw (82) via a bevel gear set (81); and the driving screw (82) is movably connected to a detection control arm (83).

8. The test system for inverter maintenance with protection function according to claim 7, characterized in that, The detection control arm (83) is plugged into the extension electric pen (5) via a plug hole, and a semi-driving sleeve (831) drivingly connected to the driving lead screw (82) is provided on the top of the detection control arm (83).

9. The test system for maintaining an inverter with a protection function according to claim 7, characterized in that, A lateral sliding rod (9) fixedly installed inside the vibration detection frame (3) is movably connected to the detection control arm (83). A detection positioning groove (35) for the rotation of the detection control arm (83) is formed in the vibration detection frame (3). A permanent magnet strip (36) for attracting the lateral sliding rod (9) is fixed on the vibration detection frame (3). A detection positioning electromagnet (37) is arranged at the bottom of the vibration detection frame (3).

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