A vibration resistance test device for inverter quality inspection

Abstract

The present invention relates to a vibration resistance testing device for quality inspection of a frequency converter, which belongs to the field of frequency converter testing. The device comprises a vibration table, on which a fixing part, a testing part and an external detection part are installed; the fixing part comprises a pair of fixing frames, the lower ends of which are fixedly connected with a positioning plate, and a fixing bolt is connected between the positioning plate and the vibration plate; the top ends of the fixing frames are fixedly connected with a longitudinal electric guide rail, a transverse electric guide rail is connected between the movable ends of the pair of longitudinal electric guide rails, and an electric telescopic rod is fixedly connected to the movable ends of the transverse electric guide rails; at least one endoscope is detachably connected to the side wall of the fixing frame, the testing part comprises a vibration motor installed on a bottom plate, and a power output end of the vibration motor is connected to the vibration plate; the external detection part comprises a wiring board arranged at the side end of the vibration table, and a distribution box is fixedly connected to the wiring board, so as to facilitate vibration testing of the frequency converter, and the results inside and outside the frequency converter and the working status can be detected and identified during the test.

Description

Technical Field

[0001] The present invention relates to a frequency converter quality inspection device, in particular to a frequency converter quality inspection vibration resistance testing device applied to the frequency converter testing field. Background Art

[0002] As an indispensable device in industrial automation, the quality of the inverter is directly related to the stable operation of the entire system. Existing inverter quality inspection devices mainly conduct comprehensive inspections on the performance of the inverter by simulating various working conditions of the inverter in actual work. These devices usually include power modules, control modules, detection modules and data processing modules. The power module is responsible for providing stable power input, the control module simulates the control signal of the inverter, the detection module monitors the voltage, current, frequency and other parameters output by the inverter in real time, and the data processing module analyzes the collected data to determine whether the inverter meets the quality standards.

[0003] The specification of Chinese invention patent CN11305490B discloses a frequency converter testing device and a testing method thereof. The invention only requires placing the frequency converter body on a slideway, and then the frequency converter body can be fixed and tested at the same time. The operation is convenient and does not require manual operation, which reduces the occurrence of safety hazards and improves work efficiency.

[0004] The Chinese invention patent CN1155454B specification discloses a safe and convenient inverter test platform. It can detect two types of inverters with terminals on the same side or both sides of the inverter, improve the adaptability of the detection platform, and push the test needle through the telescopic device to automatically connect with the inverter, without manual operation, making the detection more convenient and safer. The function of loading and unloading the inverter is completed by setting a conveyor belt, and the detection equipment can be converted to test different types of inverters.

[0005] Most of the existing inverter vibration test devices first perform a vibration test and then disassemble the inverter to detect the inverter status after vibration. It is difficult to detect abnormalities in the inverter during the vibration test, which easily wastes detection time and has low detection efficiency. Summary of the invention

[0006] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is that most of the inverter vibration test devices first perform a vibration test and then disassemble the inverter to detect the inverter status after vibration. It is difficult to detect abnormalities in the inverter during the vibration test in time, which easily wastes detection time and has low detection efficiency.

[0007] In order to solve the above problems, the present invention provides a vibration resistance test device for inverter quality inspection, comprising a vibration table, the vibration table comprising a bottom plate and a vibration plate, the bottom plate and the vibration plate are connected by two pairs of spring shock absorbers, and a fixing part, a testing part and an external detection part are installed on the vibration table;

[0008] The fixing part includes a pair of fixing frames, the lower ends of which are fixedly connected to a positioning plate, and a fixing bolt is connected between the positioning plate and the vibration plate; the top ends of the fixing frames are fixedly connected to a longitudinal electric guide rail, a transverse electric guide rail is connected between the movable ends of the pair of longitudinal electric guide rails, and an electric telescopic rod is fixedly connected to the movable ends of the transverse electric guide rails;

[0009] At least one endoscope is detachably connected to the side wall of the fixed frame, and the endoscope includes a corrugated conduit, a positioning tube is fixedly connected to the top of the corrugated conduit, a movable column is inserted in the positioning tube, an image acquisition device is fixedly connected to the movable column, a corrugated air tube matching the movable column is fixedly connected to the positioning tube, a pair of magnetic clamping strips are fixedly connected to the top of the positioning tube, a limiting clamping ring matching the magnetic clamping strip is sleeved on the positioning tube, and an electromagnet ring is fixedly connected to the limiting clamping ring;

[0010] The test part includes a vibration motor installed on the bottom plate, and the power output end of the vibration motor is connected to the vibration plate;

[0011] The external detection part comprises a wiring board arranged at the side end of the vibration table, the wiring board is fixedly connected with a distribution box, and the distribution box is fixedly connected with a plurality of test wires for connecting with the frequency converter to be tested.

[0012] In the above-mentioned vibration resistance test device for quality inspection of the frequency converter, it is convenient to perform vibration test on the frequency converter, and during the test, the internal and external results and the working status of the frequency converter can be detected and identified.

[0013] As a further improvement of the present application, the fixing frame is provided with a plurality of docking seats, one end of the corrugated conduit is fixedly connected with a docking head matching the docking seat, a wiring plug and an inflation plug are provided on the docking head, a pair of threaded grooves are provided on the docking seat, a fixing bolt matching the threaded grooves is inserted on the wiring plug, a flow guide channel is provided in the docking seat, an electromagnetic three-way valve is connected between the flow guide channel and the plurality of docking seats, and an elastic gas pipe communicating with the flow guide channel is connected to the docking seat.

[0014] As a further improvement of the present application, the top end of the test line is fixedly connected to a wiring plug, and a pressure sensor is installed on the wiring plug.

[0015] As a further improvement of the present application, one end of the vibration plate is fixedly connected to a vertical test plate, and the vertical test plate is provided with a mounting groove matching a pair of fixing frames.

[0016] As another improvement of the present application, the image acquisition device includes a mounting column, the top and side ends of the mounting column are fixedly connected to pinhole cameras, the end of the mounting column close to the corrugated air pipe is rotatably connected to a micro motor, and the power output end of the micro motor is fixedly connected to the mounting column.

[0017] As another improved supplement of the present application, a data transmission line is connected between the corrugated air tube and the positioning tube, and the micro motor and the pinhole camera are electrically connected to the docking joint through the data transmission line.

[0018] As another improvement of the present application, a receiving groove matching the magnetic card strip is provided on the limit clamp ring, and an elastic wire is connected between the electromagnet ring and the data transmission line.

[0019] As another improvement of the present application, an auxiliary test system is also included, the auxiliary test system includes a processor, and the processor is connected to a control module, a detection module, a data processing module, an alarm module and a data storage module;

[0020] The control module is used to control the test unit to perform testing work and control the endoscope to perform detection work;

[0021] The detection module is used to collect detection data when the external detection part and the endoscope are used to detect the frequency converter, and the detection data includes image data, current data and voltage data;

[0022] The data processing module is used to process the detection data and determine the inverter status;

[0023] The alarm module is used to issue a system alarm when the inverter detects an abnormality; the data storage module is used to store the detection data.

[0024] As another improvement and supplement to the present application, an auxiliary test mode is provided in the control module. When the auxiliary test mode is working, during the vibration test, the vibration test is periodically paused, and then air is inflated into the corrugated air tube to make the active column penetrate into the specified area inside the frequency converter for image acquisition. After the data processing module recognizes the acquired image, it determines the status of the internal components of the frequency converter. If it is determined that the status of the internal components of the frequency converter is normal, the corrugated air tube is evacuated to reset the active column, and then the test continues; otherwise, the system alarms and terminates the test.

[0025] In summary, it is convenient to detect, identify and judge the inner structure and working status of the inverter during the test, and it is convenient to conduct real-time analysis of the inverter status during the test, thereby improving the quality inspection efficiency of the inverter. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A three-dimensional diagram of the test device according to the first and second embodiments of the present application;

[0027] Figure 2It is a side view of the test device of the first and second embodiments of the present application in a horizontally placed test state;

[0028] Figure 3 It is a cross-sectional view of the test device of the first and second embodiments of the present application in a horizontally placed test state;

[0029] Figure 4 for Figure 3 The structural diagram at A in the middle;

[0030] Figure 5 It is a partial stereoscopic view of the endoscope of the first and second embodiments of the present application;

[0031] Figure 6 This is a schematic diagram of the test work when the inverter of the first and second implementation modes of the present application is installed vertically;

[0032] Figure 7 This is a block diagram of the auxiliary test system of the second implementation mode of the present application.

[0033] Description of the numbers in the figure:

[0034] 1 vibration table, 11 bottom plate, 12 vibration plate, 13 spring shock absorber, 2 fixing part, 21 fixing frame, 22 positioning plate, 23 electric telescopic rod, 24 transverse electric guide rail, 3 testing part, 4 external detection part, 5 endoscope, 51 corrugated conduit, 52 positioning tube, 53 movable column, 54 corrugated air tube, 55 limit clamp, 6 image acquisition device, 61 mounting column, 62 pinhole camera, 63 micro motor. DETAILED DESCRIPTION

[0035] The following describes two implementation modes of the present application in detail with reference to the accompanying drawings.

[0036] The first implementation method:

[0037] Figure 1-6 It is shown that a vibration resistance test device for inverter quality inspection includes a vibration table 1, the vibration table 1 includes a bottom plate 11 and a vibration plate 12, the bottom plate 11 and the vibration plate 12 are connected by two pairs of spring shock absorbers 13, one end of the vibration plate 12 is fixedly connected to a vertical test plate, and the vertical test plate is provided with a mounting groove matching a pair of fixing frames 21, and a fixing part 2, a testing part 3 and an external detection part 4 are installed on the vibration table 1;

[0038] The fixing part 2 includes a pair of fixing frames 21, the lower end of which is fixedly connected to a positioning plate 22, and a fixing bolt is connected between the positioning plate 22 and the vibration plate 12; the top of the fixing frame 21 is fixedly connected to a longitudinal electric guide rail, a transverse electric guide rail 24 is connected between the movable ends of the pair of longitudinal electric guide rails, and an electric telescopic rod 23 is fixedly connected to the movable end of the transverse electric guide rail 24; the fixing part 2 is used to fix the frequency converter, and the electric telescopic rod 23 is used to operate the upper panel of the frequency converter during testing; during the vibration test, the upper control panel of the frequency converter is operated by controlling the extension and retraction of the electric telescopic rod 23, so as to realize the working test of the frequency converter under the vibration environment;

[0039] At least one endoscope 5 is detachably connected to the side wall of the fixing frame 21. The endoscope 5 includes a corrugated conduit 51. A positioning tube 52 is fixedly connected to the top of the corrugated conduit 51. A movable column 53 is inserted in the positioning tube 52. An image acquisition device 6 is fixedly connected to the movable column 53. A corrugated air tube 54 matching the movable column 53 is fixedly connected to the positioning tube 52. A charging and discharging air tube matching the corrugated air tube is inserted in the corrugated conduit 51. A pair of magnetic clips are fixedly connected to the top of the positioning tube 52. A limiting clip 55 matching the magnetic clip is sleeved on the positioning tube. An electromagnet ring is fixedly connected to the limiting clip 55. A receiving groove matching the magnetic clip is provided on the limiting clip 55.

[0040] The image acquisition device 6 includes a mounting column 61, which is rotatably connected to the movable column 53. The top and side ends of the mounting column 61 are fixedly connected with a pinhole camera 62. The end of the mounting column 61 close to the corrugated air tube 54 is rotatably connected with a micro motor 63, and the power output end of the micro motor 63 is fixedly connected to the mounting column 61; a data transmission line is connected between the corrugated air tube 54 and the positioning tube 52, and the micro motor 63 and the pinhole camera 62 are electrically connected to the docking joint through the data transmission line. The micro motor 63 is used to drive the mounting column 61 to rotate, and is installed by a technician in this field using a suitable model of micro motor 63, such as: Nidec SPS10 micro DC brushless stepper motor.

[0041] When the endoscope 5 is installed on the inverter being tested, the positioning tube 52 is inserted into the heat dissipation hole of the inverter, and then the positioning tube 52 is rotated to make the magnetic clip fit with the inner wall of the inverter housing, and then the position of the limit clamp 55 is adjusted to make it fit with the outer wall of the inverter housing, and then the electromagnet ring in the limit clamp 55 is opened to make the electromagnet ring and the magnetic clip attract each other. At this time, the positioning tube 52 is attracted and fixed on the inverter housing by the limit clamp 55. At this time, the positioning tube 52 is not easy to fall off from the inverter during the vibration test; an elastic wire is connected between the electromagnet ring and the data transmission line, and the electromagnet ring is powered by the data transmission line.

[0042] After the positioning tube 52 is installed, the corrugated air tube 54 can be inflated and deflated through the corrugated conduit 51 as needed to adjust the length of the image acquisition device 6 extending out of the positioning tube 52. At this time, the image acquisition device 6 can be fixed in position to monitor a fixed area in the frequency converter, or it can be put into the positioning tube 52 and controlled to extend out for image acquisition when needed;

[0043] The test part 3 includes a vibration motor installed on the bottom plate 11, and the power output end of the vibration motor is connected to the vibration plate 12; the test part 3 is used to adjust the vibration state; a person skilled in the art uses a vibration motor of a suitable model in the prior art to install it, and controls the vibration plate 12 to vibrate in the vertical direction through the control of the vibration motor;

[0044] The external detection unit 4 includes a wiring board arranged at the side end of the vibration table 1, and a distribution box is fixedly connected to the wiring board. A plurality of test lines for connecting to the frequency converter to be tested are fixedly connected to the distribution box. A wiring plug is fixedly connected to the top of the test line. A pressure sensor is installed on the wiring plug. When the wiring plug is connected to the frequency converter, the pressure sensor on the wiring plug is pressurized. The external detection unit 4 monitors whether the frequency converter wiring is loose during the vibration process through the pressure sensor. The test line is used to monitor the input and output voltages and currents of the frequency converter, so as to realize the current and voltage change monitoring when the frequency converter works in a vibration environment;

[0045] The fixing frame 21 is provided with a plurality of docking seats, one end of the corrugated conduit 51 is fixedly connected with a docking head matching the docking seat, a wiring plug and an inflation plug are provided on the docking head, a pair of threaded grooves are provided on the docking seat, a fixing bolt matching the threaded grooves is plugged into the wiring plug, a flow guide channel is provided in the docking seat, an electromagnetic three-way valve is connected between the flow guide channel and the plurality of docking seats, an elastic air delivery pipe communicating with the flow guide channel is connected to the docking seat, the elastic air delivery pipe is connected to an air pump, and an air pump capable of realizing the pumping and deflation functions in the prior art is selected by a person skilled in the art for installation;

[0046] When the present scheme performs a vibration test, the vibration plate 12 is vibrated by controlling the vibration motor of the test unit, and then the frequency converter fixed on the vibration plate 12 is vibrated, so as to realize the vibration test of the frequency converter. During the vibration test, the longitudinal electric guide rail, the transverse electric guide rail 24 and the electric telescopic rod 23 can be controlled to operate the frequency converter control panel to simulate the manual operation of the frequency converter in a vibration environment; and the external detection unit 4 is used to provide voltage to the frequency converter, and the current and voltage changes of the frequency converter when working in a vibration environment are monitored at the same time; and the working status data collection of the frequency converter when vibrating is realized;

[0047] Before the vibration test of the inverter, an endoscope 5 is installed on the inverter so that the image acquisition device 6 on the endoscope 5 is on standby on the inverter. When the vibration test is working, the image acquisition device 6 can be extended into the inverter as needed to acquire images of its internal structure so as to determine whether the internal components of the inverter are stable and firm when it vibrates. The introduction of the image acquisition device 6 makes the inspection of the internal parts of the inverter more intuitive and detailed, thereby improving the accuracy and reliability of the test.

[0048] This solution facilitates vibration testing of the inverter, and during the test, the internal structure and working status of the inverter can be detected and identified.

[0049] Second implementation method:

[0050] Figure 7 As shown, it also includes an auxiliary test system, which includes a processor, and the processor is connected to a control module, a detection module, a data processing module, an alarm module and a data storage module;

[0051] The control module is used to control the testing unit 3 to perform testing work and control the endoscope 5 to perform detection work;

[0052] The detection module is used to collect detection data when the external detection unit 4 and the endoscope 5 perform inverter detection, and the detection data includes image data, current data and voltage data;

[0053] Optionally, an image collector is provided on the external detection unit 4 and is used for real-time image collection of the external structure of the frequency converter;

[0054] The data processing module is used to process the detection data and determine the inverter status; the data processing module analyzes in real time whether the internal and external structural image data, current data and voltage data of the inverter during vibration are normal, that is, whether the internal and external structural images change, and whether the current and voltage data are within the set normal value range; if the above data are abnormal, the inverter is judged to be abnormal, and the test can be terminated at this time;

[0055] The alarm module is used to issue a system alarm when the inverter detects an abnormality; the data storage module is used to store the detection data.

[0056] An auxiliary test mode is provided in the control module. When the auxiliary test mode is working, during the vibration test, the vibration test is periodically paused, and then air is inflated into the corrugated air pipe 54 to make the active column 53 penetrate into the specified area in the frequency converter and perform image acquisition through the image acquisition device 6. After the data processing module recognizes the acquired image, it determines the status of the components inside the frequency converter. If it is determined that the status of the components inside the frequency converter is normal (that is, the acquired structural image is unchanged compared to the initial state of the corresponding structure in the frequency converter), the corrugated air pipe 54 is evacuated to reset the active column 53, and then the test is continued; otherwise, the system alarms and terminates the test.

[0057] In the auxiliary test mode of this embodiment, during the vibration test, the image acquisition device 6 will be retracted into the positioning column 52 to avoid the movable column 53 and the internal components of the inverter from contacting each other and causing damage during the vibration test.

[0058] This solution uses an auxiliary test system to monitor the various parameters of the inverter during vibration testing, such as current, voltage, and stability of the internal structure.

[0059] In practical applications, the auxiliary test system can automatically adjust test parameters such as vibration frequency, amplitude and duration according to the model and test requirements of the inverter to ensure the scientificity and applicability of the test results.

[0060] In summary, this solution facilitates the detection, identification and judgment of the internal structure and working status of the inverter during the test, and facilitates real-time analysis of the inverter status during the test, thereby improving the quality inspection efficiency of the inverter, enhancing the comprehensiveness and accuracy of the test, and providing strong quality assurance for the production and application of the inverter.

[0061] In view of current practical needs, the above-mentioned implementation mode adopted in this application is not limited to the scope of protection. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the scope of protection of the present invention.

Claims

1. A vibration resistance test device for inverter quality inspection, characterized in that: The vibration table (1) comprises a bottom plate (11) and a vibration plate (12), the bottom plate (11) and the vibration plate (12) being connected via two pairs of spring shock absorbers (13), and a fixing part (2), a testing part (3) and an external detection part (4) being mounted on the vibration table (1); The fixing portion (2) comprises a pair of fixing frames (21), the lower ends of the fixing frames (21) being fixedly connected to a positioning plate (22), a fixing bolt being connected between the positioning plate (22) and the vibration plate (12); the top ends of the fixing frames (21) being fixedly connected to a longitudinal electric guide rail, a transverse electric guide rail (24) being connected between the movable ends of the pair of longitudinal electric guide rails, an electric telescopic rod (23) being fixedly connected to the movable ends of the transverse electric guide rails (24); the electric telescopic rod (23) being used to operate the upper panel of the frequency converter during testing; during the vibration test, the control panel on the frequency converter is operated by controlling the extension and retraction of the electric telescopic rod (23); At least one endoscope (5) is detachably connected to the side wall of the fixing frame (21), the endoscope (5) comprising a corrugated conduit (51), a positioning tube (52) being fixedly connected to the top end of the corrugated conduit (51), a movable column (53) being inserted into the positioning tube (52), an image acquisition device (6) being fixedly connected to the movable column (53), a corrugated air tube (54) matching the movable column (53) being fixedly connected to the positioning tube (52), a pair of magnetic clamping strips being fixedly connected to the top end of the positioning tube (52), a limiting clamping ring (55) matching the magnetic clamping strip being sleeved on the positioning tube, and an electromagnet ring being fixedly connected to the limiting clamping ring (55); The testing part (3) comprises a vibration motor mounted on a base plate (11), wherein a power output end of the vibration motor is connected to a vibration plate (12); The external detection part (4) comprises a wiring board arranged at a side end of the vibration table (1), the wiring board is fixedly connected to a distribution box, and the distribution box is fixedly connected to a plurality of test wires for connecting to the frequency converter to be tested.

2. A vibration resistance test device for inverter quality inspection according to claim 1, characterized in that: The fixing frame (21) is provided with a plurality of docking seats, one end of the corrugated conduit (51) is fixedly connected with a docking head matching the docking seat, the docking head is provided with a wiring plug and an inflation plug, the docking seat is provided with a pair of threaded grooves, the wiring plug is plugged with a fixing bolt matching the threaded grooves, a flow guide channel is provided in the docking seat, an electromagnetic three-way valve is connected between the flow guide channel and the plurality of docking seats, and the docking seat is connected with an elastic air delivery pipe communicating with the flow guide channel.

3. The vibration resistance testing device for inverter quality inspection according to claim 1, characterized in that: The top end of the test line is fixedly connected with a wiring plug, and a pressure sensor is installed on the wiring plug.

4. The vibration resistance testing device for inverter quality inspection according to claim 1, characterized in that: One end of the vibration plate (12) is fixedly connected to a vertical test plate, and the vertical test plate is provided with a mounting groove matching a pair of fixing frames (21).

5. The vibration resistance testing device for inverter quality inspection according to claim 2, characterized in that: The image acquisition device (6) comprises a mounting column (61), the top and side ends of the mounting column (61) are fixedly connected to pinhole cameras (62), one end of the mounting column (61) close to the corrugated air pipe (54) is rotatably connected to a micro motor (63), and the power output end of the micro motor (63) is fixedly connected to the mounting column (61).

6. A vibration resistance test device for inverter quality inspection according to claim 5, characterized in that: A data transmission line is connected between the corrugated air pipe (54) and the positioning tube (52), and the micro motor (63) and the pinhole camera (62) are both electrically connected to the docking connector via the data transmission line.

7. The vibration resistance testing device for inverter quality inspection according to claim 1, characterized in that: The limit clamp ring (55) is provided with a receiving groove matching the magnetic clamp strip, and an elastic wire is connected between the electromagnet ring and the data transmission line.

8. The vibration resistance testing device for inverter quality inspection according to claim 5, characterized in that: It also includes an auxiliary test system, which includes a processor, and the processor is connected to a control module, a detection module, a data processing module, an alarm module and a data storage module; The control module is used to control the testing part (3) to perform testing work and to control the endoscope (5) to perform detection work; The detection module is used to collect detection data when the external detection part (4) and the endoscope (5) perform inverter detection, and the detection data includes image data, current data and voltage data; The data processing module is used to process the detection data and determine the state of the frequency converter; The alarm module is used to issue a system alarm when the frequency converter detects an abnormality; the data storage module is used to store detection data.

9. A vibration resistance test device for inverter quality inspection according to claim 8, characterized in that: The control module is provided with an auxiliary test mode. When the auxiliary test mode is in operation, during the vibration test, the vibration test is periodically suspended, and then air is inflated into the corrugated air pipe (54) so ​​that the movable column (53) penetrates into a designated area in the frequency converter to collect images. After the data processing module identifies the collected images, the state of the components inside the frequency converter is determined. If the state of the components inside the frequency converter is determined to be normal, air is pumped out of the corrugated air pipe (54) to reset the movable column (53) and then the test is continued; otherwise, the system alarms and the test is terminated.

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