Testing System for Inverter Maintenance with Protection Function

Abstract

The present invention discloses a test system for inverter maintenance with a protective function, belonging to the field of inverter testing technology. The system includes a detection base, a simulation unit for simulating the actual working conditions of a frequency conversion control board, and a detection mechanism for detecting the internal diode of the frequency conversion control board. The present invention can flexibly adjust the vibration direction of the vibration source through the dynamic coordination of a polarization component and a rotating simulation disk, thereby covering the multi-dimensional vibration scenarios that may be encountered in the actual operation of the frequency conversion control board, solving the problem of lack of vibration source simulation in the traditional frequency conversion test process, and simulating the elastic support environment of the actual installation through an airbag spring suspension, avoiding the distortion of vibration energy emission caused by rigid fixation, thereby improving the accuracy of large-capacitor vibration fatigue testing, and realizing automatic step-by-step wiring operation of the detection by cooperating with a multimeter through the detection drive component, thereby improving the overall detection wiring efficiency.

Description

Technical Field

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

[0002] The inverter primarily consists of a rectifier, filter, inverter, brake unit, drive unit, detection unit, and microprocessor. Its primary function is to regulate the speed of the motor. By switching internal IGBTs, it adjusts the output power voltage and frequency, which is converted by the intermediate capacitor. The output power is then adjusted to the motor's actual needs.

[0003] Currently, when performing maintenance tests on inverters, it is often necessary to use a multimeter to test the wiring of its input (RST) and output (UVW) terminals. During the test, by changing the positive and negative poles of the test leads, the above wiring test is repeated to determine whether the multiple rectifier diodes and inverter diodes on the inverter control board are intact.

[0004] However, this wiring method is highly dependent on manual operation by maintenance personnel, and cannot be tested quickly. It also requires a high level of wiring experience from maintenance personnel. In actual use, the inverter control board is often installed near the control motor and will be affected by the load vibration driven by the motor. It is easy to cause desoldering of the solder joints of large internal circuit components, namely large capacitors, and reduce the bootstrap voltage. As a result, the DC voltage of the inverter circuit is converted into the output variable frequency AC power under the action of electric pulses, the current is weakened, and the load cannot be started. Existing maintenance tests are all performed on stably placed testing equipment, which cannot actually simulate the actual working conditions of the inverter control board, resulting in a decrease in the accuracy of the experimental data at the test site and an increase in test errors. Summary of the Invention

[0005] The purpose of the present invention is to solve the problems existing in the prior art and to propose a frequency converter maintenance test system with protection function.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A test system for inverter maintenance with a protective function includes a test base for testing a variable frequency control board. The top of the test base clamps the variable frequency control board via a clamping assembly. The test base is provided with a simulation unit for simulating the actual working conditions of the variable frequency control board. The simulation unit consists of a balance adjustment mechanism and a vibration simulation mechanism. The test base is also provided with a detection mechanism for detecting the internal diodes of the variable frequency control board.

[0008] 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. A polarization component is fixedly installed on the top of the simulation disk.

[0009] The detection mechanism includes a multi-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-meter through a wire.

[0010] Preferably, the clamping assembly includes a clamping bolt and a clamping wedge, and the contact surface between the clamping wedge and the frequency conversion control board is obliquely provided with an anti-debonding layer.

[0011] Preferably, the balance adjustment mechanism includes 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.

[0012] 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.

[0013] 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. The simulation seat is engaged with the positioning hole via a positioning pin to position the rotation direction of the simulation disk.

[0014] Preferably, the polarization component includes a servo motor installed on the top of the simulation disk and started and stopped synchronously. The output end of the servo motor is fixedly installed with a polarization turntable. 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.

[0015] Preferably, the detection drive assembly includes 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 the detection control arm.

[0016] Preferably, the detection control arm is plugged into the extension electric pen through a plug hole, and a semi-driving sleeve is provided on the top of the detection control arm for transmission connection with the driving screw.

[0017] Preferably, a transverse sliding bar movably connected to the detection control arm is fixedly installed in the vibration detection frame, a detection positioning slot for the detection control arm to rotate is provided 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 provided at the bottom of the vibration detection frame.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. Through the dynamic coordination of the polarization component and the rotating simulation disk, the vibration direction of the vibration source can be flexibly adjusted, thereby covering the multi-dimensional vibration scenarios that may be encountered in the actual operation of the frequency conversion control board. This solves the problem of lack of vibration source simulation in the traditional frequency converter testing process. In addition, the airbag spring suspension simulates the elastic support environment of the actual installation, avoiding the distortion of vibration energy emission caused by rigid fixation, and improving the accuracy of large capacitor vibration fatigue testing.

[0020] 2. By driving the extended test pen with a stepper motor, collision-free contact is achieved for densely arranged test contacts, which is suitable for miniaturized terminal detection of frequency converter boards. By controlling the combination switching of the extended test pen and coordinating with the range switching of the multimeter, the static parameter test of the rectifier bridge stack and inverter IGBT module can be completed quickly, and the charge and discharge characteristics of the electrolytic capacitor can be tested. This can promptly remind maintenance personnel to check whether the capacitor has desoldering problems due to the vibration environment.

[0021] 3. By combining the detection drive assembly with a multimeter, automatic wiring operation of the detection is realized. By detecting the positioning electromagnet, the rotation of the detection control arm that arrives at the detection point can be accurately controlled. When the subsequent stepper motor drives the drive screw to rotate, the remaining extended electric pens continue to be driven, achieving the effect of step-by-step control of the extended electric pens. This eliminates the need for manual wiring by maintenance personnel, reduces the wiring experience requirements for maintenance personnel, and improves the overall detection wiring efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The overall structure of the inverter maintenance test system with protection function proposed by the present invention is shown in FIG. Figure 1 ;

[0023] Figure 2 For the present invention Figure 1 A magnified view of the structure at center A;

[0024] Figure 3 The overall structure of the inverter maintenance test system with protection function proposed by the present invention is shown in FIG. Figure 2 ;

[0025] Figure 4 For the present invention Figure 3 A magnified view of the structure at B in the middle;

[0026] Figure 5 This is a schematic diagram of the internal structure of the cross section of the inverter maintenance test system with protection function proposed by the present invention;

[0027] Figure 6 This is an overall structural assembly view of the inverter maintenance test system with protection function proposed by the present invention;

[0028] Figure 7 This is a structural diagram of the positioning component in the inverter maintenance test system with protection function proposed by the present invention;

[0029] Figure 8 This is a structural diagram of the detection drive component in the inverter maintenance test system with protection function proposed by the present invention.

[0030] Figure markings: 1. Detection seat; 11. Airbag spring; 2. Frequency conversion control board; 3. Vibration detection frame; 31. Vibration beam; 32. Simulation seat; 321. Positioning pin; 322. Compression spring; 33. Simulation disk; 34. Servo motor; 341. Polarization turntable; 35. Detection positioning slot; 36. Permanent magnet strip; 37. Detection positioning electromagnet; 4. Multimeter; 5. Extension electric pen; 6. Clamping bolt; 61. Clamping wedge; 7. Balance bar; 71. Balance knob; 72. Balance weight box; 8. Stepper motor; 81. Bevel gear set; 82. Drive screw; 83. Detection control arm; 831. Half drive sleeve; 9. Horizontal slide bar. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0032] In the description of the present invention, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0033] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "mounted / connected," and "connected" should be understood in a broad sense. For example, "connected" can mean a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be internal communication between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention in specific circumstances.

[0034] Example, see Figures 1 to 8 , a test system for inverter maintenance with protection function, includes a detection base 1 for testing the frequency conversion control board 2. The frequency conversion control board 2 is clamped on the top of the detection base 1 by a clamping component. The detection base 1 is provided with a simulation unit for simulating the actual working condition of the frequency conversion control board 2. The simulation unit consists of a balance adjustment mechanism and a vibration simulation mechanism. The detection base 1 is also provided with a detection mechanism for detecting the internal diode of the frequency conversion control board 2.

[0035] Furthermore, the clamping assembly 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 and provided with an anti-debonding layer. The clamping wedge 61 and the vibration detection frame 3 provide clamping for both sides of the frequency conversion control board 2, thereby stably clamping the frequency conversion control board 2 during the simulation test, and preventing the frequency conversion control board 2 from shaking during the test, resulting in disconnection at the detection point of the extended electric pen 5;

[0036] Furthermore, the balance adjustment mechanism includes a balance bar 7 provided on both sides of the vibration detection frame 3, the balance bar 7 being threadedly connected to a balance knob 71 through a threaded groove, and the balance bar 7 being slidably connected to a balance weight box 72 through a smooth surface, so that the balance weight on the other side can be adjusted in time based on the bias setting of the large capacitor during the test of the frequency conversion control board 2, to ensure that 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 during the test, thereby avoiding the deviation of the 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 assembly, thereby increasing the test error;

[0037] It should be noted that a large capacitor and a wiring side plate extending outward are provided on the frequency conversion control board 2, and the wiring side plate is crimped to the wires by means of screw crimping. The large capacitor and the wiring side plate are conventional designs on the existing frequency conversion control board 2 and will not be described in detail here. When the frequency conversion control board 2 is tested, the detection contact piece is pre-crimped on the wiring side plate so that it can contact the touch part of the extended electric pen 5, thereby reflecting the usage status of the rectifier diode and the inverter diode on the frequency conversion control board 2 in real time.

[0038] like Figures 1 to 4As 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 beam 31. The vibration beam 31 is installed on the top of the detection base 1 through the airbag spring 11. The vibration component includes a simulation base 32 arranged on both sides of the vibration detection frame 3. The simulation base 32 is clamped with two symmetrically arranged simulation disks 33 through a positioning component. A polarization component is fixedly installed on the top of the simulation disk 33.

[0039] Furthermore, if Figure 7 As 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 via a compression spring 322. 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 the positioning pin 321 to position the rotation direction of the simulation disk 33.

[0040] Furthermore, the polarization assembly includes a servo motor 34 mounted on top of the simulation disk 33 and started and stopped synchronously. A polarization turntable 341 is fixedly mounted on 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.

[0041] It should be noted that after the frequency conversion control board 2 is mounted on the vibration detection frame 3, the polarization component can drive the simulation disk 33 to vibrate, thereby simulating in real time the vibration environment that the frequency conversion control board 2 is subjected to when actually working near the motor load. The vibration detection frame 3 is suspended in the air 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, thereby causing the frequency conversion control board 2 to fluctuate synchronously with the vibration direction of the vibration source during the vibration simulation process, achieving an effect of highly simulating its actual working conditions.

[0042] 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 positioning component can be used to cooperate with the rotation of the simulation disk 33 to change the swing direction of the polarization turntable 341, and the influence of the changed vibration source is transmitted from the simulation disk 33 to the vibration detection frame 3, so that the vibration direction of the simulation disk 33 changes accordingly, thereby being able to adjust 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.

[0043] like Figures 1 to 5As shown, the detection mechanism includes a multimeter 4 and an extension test pen 5 arranged on a vibration detection frame 3. The vibration detection frame 3 controls the extension test pen 5 through a detection drive component, and the extension test pen 5 is electrically connected to the multimeter 4 through a wire.

[0044] Furthermore, if Figure 6 and Figure 8 As shown, the detection drive assembly includes a stepper motor 8 provided 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;

[0045] 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 for transmission connection with the driving screw 82;

[0046] Furthermore, a transverse slide bar 9 movably connected to the detection control arm 83 is fixedly installed in the vibration detection frame 3, a detection positioning slot 35 for the detection control arm 83 to rotate is provided on the vibration detection frame 3, a permanent magnet strip 36 for attracting the transverse slide bar 9 is fixed on the vibration detection frame 3, and a detection positioning electromagnet 37 is provided at the bottom of the vibration detection frame 3, so that when the stepping motor 8 is started and the driving screw 82 is driven to rotate, the detection control arm 83 is attracted by the permanent magnet strip 36 to keep it in a horizontal state, and when the detection control arm 83 moves to the corresponding detection positioning slot 35, the detection positioning electromagnet 37 is started to generate an attraction force greater than the permanent magnet strip 36 on the detection control arm 83, so that the detection control arm 83 rotates downward, and the extended 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;

[0047] It should be noted that: when it is necessary to test the input and output ends of the frequency conversion control board 2, the extended electric pen 5 can be plugged into the detection control arm 83, and driven by the stepper motor 8, the extended electric pen 5 is driven to move to the detection contact piece to be touched, and then the extended electric pen 5 is driven to rotate outward by starting the detection positioning electromagnet 37, so that the touch part of the extended electric pen 5 is connected to the corresponding terminal on the frequency conversion control board 2, so that according to the reading on the multimeter 4, it can be determined whether the rectifier diode or inverter diode corresponding to the terminal of the frequency conversion control board 2 here, and whether the large capacitor is damaged.

[0048] 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, connect one of the extended electric pen 5 on one side to the positive pole of the frequency conversion control board 2, and then connect one of the extended electric pen 5 on the other side to the three-phase power access points of the input end of the frequency conversion control board 2 one by one (the output process of the input and output ends of the frequency conversion control board 2 using three-phase electricity is a common input and output process in existing inverters and will not be repeated here), and after the multimeter 4 is adjusted to the diode position, the reading is obtained to obtain the corresponding three rectifier diodes, and then the extended electric pen 5 connected to the positive pole of the frequency conversion control board 2 is connected to the negative pole, and the above three-phase power access point contact process is repeated to obtain the quality of the remaining three corresponding rectifier diodes.

[0049] When it is necessary to test the quality of the reverse current diode corresponding to the output end of the frequency conversion control board 2, one of the extended electric pen 5 on one side is connected to the positive pole of the frequency conversion control board 2, and then the other extended electric pen 5 on one side is contacted one by one with the three-phase electrical output points of the output end of the frequency conversion control board 2 to determine whether the corresponding three inverter diodes are damaged. Similarly, the extended electric pen 5 connected to the positive pole is changed to be connected to the negative pole, and the contact process of the output point is repeated to determine whether the remaining three corresponding inverter diodes are damaged.

[0050] The process of detecting whether the large capacitor on the frequency conversion control board 2 is desoldering is as follows: the frequency conversion control board 2 is charged, and after charging for a period of time, the current of the three-phase output point of the output end of the frequency conversion control board 2 is tested by changing the multimeter 4 to the current range. In this way, it is possible to determine whether the charging and discharging of the capacitor is normal based on whether the current meets the motor load operation requirements, and whether the capacitor is damaged. Furthermore, it is possible to promptly remind maintenance personnel and promptly check whether the large capacitor on the frequency conversion control board 2 is desoldering.

[0051] Working principle:

[0052] The present invention is divided into a real working condition simulation process and a detection wiring drive process when performing maintenance testing on the frequency conversion control board 2. The real working condition simulation process is as follows: after the frequency conversion control board 2 is installed on the vibration detection frame 3, the simulation disk 33 is driven to vibrate by the polarization component, thereby simulating in real time the vibration environment that the frequency conversion control board 2 is subjected to when actually working 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, thereby causing the frequency conversion control board 2 to fluctuate synchronously with the vibration direction of the vibration source during the vibration simulation process, thereby achieving an effect of highly simulating its actual working condition;

[0053] Based on the above, 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 source influence after the change is transmitted from the simulation disk 33 to the vibration detection frame 3, so that the vibration direction of the simulation disk 33 changes accordingly, so that the vibration direction of the simulation disk 33 can be adjusted 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.

[0054] The detection wiring drive process is as follows: when it is necessary to test the input and output terminals of the frequency conversion control board 2, the extended electric pen 5 can be plugged into the detection control arm 83 and driven by the stepper motor 8 to move the extended electric pen 5 to the detection contact piece to be contacted. Then, the detection positioning electromagnet 37 is activated to drive the extended electric pen 5 to rotate outward so that the contact part of the extended electric pen 5 is connected to the corresponding terminal on the frequency conversion control board 2. Therefore, based on the readings on the multimeter 4, it can be determined whether the rectifier diode or inverter diode corresponding to the terminal of the frequency conversion control board 2 is damaged, as well as whether the large capacitor is damaged.

[0055] 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, connect one of the extended electric pen 5 on one side to the positive pole of the frequency conversion control board 2, and then connect one of the extended electric pen 5 on the other side to the three-phase power access points of the input end of the frequency conversion control board 2 one by one, and adjust the multimeter 4 to the diode position to obtain the reading of the corresponding three rectifier diodes. Then, connect the extended electric pen 5 connected to the positive pole of the frequency conversion control board 2 to the negative pole, and repeat the above three-phase power access point contact process to obtain the quality of the remaining three corresponding rectifier diodes.

[0056] When it is necessary to test the quality of the reverse current diode corresponding to the output end of the frequency conversion control board 2, one of the extended electric pen 5 on one side is connected to the positive pole of the frequency conversion control board 2, and then the other extended electric pen 5 on one side is contacted one by one with the three-phase electrical output points of the output end of the frequency conversion control board 2 to determine whether the corresponding three inverter diodes are damaged. Similarly, the extended electric pen 5 connected to the positive pole is changed to be connected to the negative pole, and the contact process of the output point is repeated to determine whether the remaining three corresponding inverter diodes are damaged.

[0057] The process of detecting whether the large capacitor on the frequency conversion control board 2 is desoldering is as follows: the frequency conversion control board 2 is charged, and after charging for a period of time, the current of the three-phase output point of the output end of the frequency conversion control board 2 is tested by changing the multimeter 4 to the current range. In this way, it is possible to determine whether the charging and discharging of the capacitor is normal based on whether the current meets the motor load operation requirements, and whether the capacitor is damaged. Furthermore, it is possible to promptly remind maintenance personnel and promptly check whether the large capacitor on the frequency conversion control board 2 is desoldering.

[0058] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A test system for maintenance of a frequency converter with a protection function, comprising a test base (1) for testing a frequency converter control board (2), characterized in that: The top of the detection seat (1) clamps the frequency conversion control board (2) through a clamping assembly. The detection seat (1) is provided with a simulation unit for simulating the actual working condition of the frequency conversion control board (2). 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) through a vibration beam (31). The vibration beam (31) is installed on the top of the detection seat (1) through 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 connected to two symmetrically arranged simulation disks (33) through a positioning component. A polarization component is fixedly installed on the top of the simulation disk (33); The polarization assembly includes a servo motor (34) mounted on the top of the simulation disk (33) and started and stopped synchronously. A polarization rotating disk (341) is fixedly mounted on the output end of the servo motor (34). 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) and simulating the actual working condition of the frequency conversion control board (2); The detection mechanism comprises 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.

2. The inverter maintenance test system 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 provided at an angle on the contact surface between the clamping wedge (61) and the frequency conversion control board (2).

3. The inverter maintenance test system with protection function according to claim 1, characterized in that: The balance adjustment mechanism comprises balance rods (7) arranged on both sides of the vibration detection frame (3), the balance rods (7) being threadedly connected to balance knobs (71) via thread grooves, and the balance rods (7) being slidably connected to balance weight boxes (72) via smooth surfaces.

4. The inverter maintenance test system with protection function according to claim 1, characterized in that: The positioning assembly comprises a positioning pin (321) plugged into the simulation disk (33), and the positioning pin (321) is slidably connected to the simulation seat (32) via a compression spring (322).

5. The inverter maintenance test system 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 inverter maintenance test system 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 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).

7. The inverter maintenance test system with protection function according to claim 6, characterized in that: The detection control arm (83) is plugged into the extension electric pen (5) through a 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).

8. The inverter maintenance test system with protection function according to claim 6, characterized in that: A transverse sliding bar (9) movably connected to the detection control arm (83) is fixedly installed in the vibration detection frame (3), a detection positioning slot (35) for the detection control arm (83) to rotate is provided on the vibration detection frame (3), a permanent magnet strip (36) for attracting the transverse sliding bar (9) is fixed on the vibration detection frame (3), and a detection positioning electromagnet (37) is provided at the bottom of the vibration detection frame (3).

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