In the face of some detailed failures, how does Shanghai Jianhu ensure the safety of the vibration testing machine?
Vibration testing machine is currently a leading enterprise in the environmental testing industry, making progress steadily. On the road of development, it has brought many surprises to the environmental testing industry. At present, Shanghai Jianhu Instrument Equipment Co., Ltd. as a manufacturer of vibration testing machine In response to some minor faults in the device, the following analysis is made, hoping to help everyone.
First of all, let ’s first understand the vibration testing machine. This equipment can mainly provide the vibration environment of the product during manufacturing, transportation and use. Identify whether the product has the ability to withstand this environment. Structural strength test. It is widely used in defense, aviation, aerospace, communications, electronics, electrical appliances, automobile manufacturing and other industries.
Secondly, what details should we pay attention to when operating the vibration testing machine, and the following details introduced by Shanghai Jianhu Instruments are very important, I hope you can keep them in mind.
1. Determine the power supply and connect the power cord. (Pay attention to the power supply distinction of the machine, 220V and 380V external incoming power problems)
2. Connect the table cable to the corresponding output port. (Vertical output or horizontal output, and pay attention to the direction selection of the three-axis switch)
3. Fine-tune the amplitude adjustment to "0" position before starting.
4. Press the power switch to "ON", the power is turned on, and the indicator light is on. (Except 5000Hz)
5. When L-shaped amplitude modulation is output, slowly rotate the amplitude adjustment knob to make the table reach the desired amplitude.
6. When the function is output, the amplitude of the frequency is mainly output through the function regulator. At this time, the fine adjustment amplitude adjustment knob only plays the role of fine adjustment.
7. The amplitude should be adjusted not to exceed the amplitude range of the machine itself, otherwise it will be out of control or abnormal noise, and the work should be stopped immediately to correct it.
8. The standard vibration test machine is a simulated car transportation test for the packaging box of the product, and the bare machine test of the product must not be carried out to avoid scratching and damaging the sample;
9. The weight of the test sample should not exceed the maximum load to avoid long-term overload use, which will lead to increased maintenance and shortened life of the test machine; 10. Fixation of the test sample: place the object to be tested in the center of the worktable, move the four movable splints to fix the product Tighten the screws, leaving a gap of about 1mm between each tablet and the packaging box, not to clamp the test sample firmly;
11. After normal operation or normal operation, the main test object on the table should be fixed to prevent the loss of objects caused by vibration displacement.
12. The tabletop cannot work in the state of large amplitude of overload or no load for a long time.
13. The control box is a power control component, and must not withstand heavy objects and severe vibration.
14. Never connect or disconnect any cables during work
15. The control box and the table are equipped with heat dissipation holes, any logistics and debris can not enter.
16. If abnormal sound is found, it should be stopped immediately for inspection, or contact the manufacturer for treatment before continuing operation.
17. Unexpected program interruption. Due to internal or external reasons, the computer peripherals are not working properly or the wrong key is pressed to cause the computer program to be interrupted, or there is a crash, but the vibration process may still be in progress. At this time, the test time should be recorded and the gain should be turned to zero. Turn off the high voltage of the amplifier, stop the shaking table test, and restart. The random vibration test has the same requirements for fixture design and installation as the sinusoidal test. The resonance frequency of the fixture may also cause local deviations. In this system, if the number of spectral lines exceeding the limit tolerance band is less than 10% of the total number of spectral lines, the system displays the number of out-of-tolerance lines, which is determined by the tester, because some specifications only allow 5% out-of-tolerance. Experience has shown that in the case of a large number of out-of-tolerance spectral lines, the multi-point average control method is often used, and the problem can be alleviated. Users may wish to give it a try.
18. Drive spectrum memory function. In the test of complex structures including fixtures and test pieces, due to the existence of sharp resonance and anti-resonance peaks and valleys, the equalization time is longer, and the equalization process inevitably experienced out of tolerance. In order to solve this problem, After exiting the test operation after good balance, if you do not reset the parameters (or recall the parameters), and then enter the test operation, reduce the previous drive spectrum by 12dB to start the test, which will greatly speed up the equalization process.
19. Click "Exit" in the "Project" (grayed out while the test is in progress) or click X in the upper right corner (invalid when the test is in progress) to exit the random test procedure. Please do not exit the program before the test is stopped, because this will make the vibration test out of control and lose the test data! If you do not need to test, you should first turn off the gain knob, turn off the vibration tester amplifier, exit WINDOWS, and finally close the computer.
20. Warning and limit tolerance. When 5% of the spectral line errors exceed the preset warning tolerance, or more than one spectral line exceeds the limit tolerance, the alarm message is displayed on the screen, and the number of out of tolerance lines is displayed in hexadecimal numbers, exceeding the limit Tolerance 1 line displays 100, at the same time ringing warning, when the next time the balance is not out of tolerance, the warning message disappears, the bell no longer rings. When the number of spectral lines whose equalization tolerance exceeds the preset limit tolerance exceeds 10%, the test will automatically stop, the start and end time of the test will be displayed on the screen, and the last frame of data will be saved. Frequent out-of-tolerance shutdowns are often caused by the sharp resonance of the test piece or fixture or the impact between the gaps. The design and installation of the fixture should be improved, and the test tolerance must be increased.
Finally, by understanding the related vibration testing machine failure problems and solutions provided by Shanghai Jianhu Instrument Engineers above, these failure problems are no longer a problem for everyone, because the failures caused by various misoperations here have become read. Readers' "handle".
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