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Safety helmet quality detection system and detection method based on time-domain transient analysis

A quality inspection method and transient analysis technology, applied in the testing of mechanical parts, the testing of machine/structural parts, measuring devices, etc., can solve the problems of inaccurate quality inspection of helmets, inability to detect sudden changes in force values ​​or critical damage, etc. , to achieve good practical value and promotion significance, accurate detection and judgment, and the effect of improving the accuracy of judgment

Active Publication Date: 2018-08-10
青岛普洛斯科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The technical problem to be solved by the present invention is to solve defects such as inaccurate quality inspection of helmets due to the inability to detect sudden changes in force values ​​or critical damage in the prior art, and propose a method based on time-domain transient Analytical safety helmet quality inspection system and inspection method

Method used

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  • Safety helmet quality detection system and detection method based on time-domain transient analysis

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Embodiment 1

[0044] Embodiment 1. This embodiment proposes a safety helmet quality detection method based on time-domain transient analysis, which specifically includes the following steps:

[0045] A. Collect and store the force value change data of the helmet during the whole test of the helmet puncture test;

[0046] B. Based on the change data of the force value above, analyze and obtain the maximum force value of the helmet during the entire test process, so as to determine the rising period and the falling period of the force value of the helmet;

[0047] C. If the maximum value of the force in step B exceeds the safety standard value, it can be directly determined that the quality of the safety helmet is unqualified; if not, then perform step D;

[0048] D. Carry out time-domain analysis on the data of the rising section of the force value and the data of the falling section of the force value respectively, and judge whether there is a sudden change in the force value:

[0049] D1....

Embodiment 2

[0063] Embodiment 2, based on the detection method described in Embodiment 1, this embodiment proposes a safety helmet quality detection system based on time-domain transient analysis, refer to Figure 5 Its functional block diagram includes the main control module, pressure signal acquisition and conversion module, A / D converter, memory and LCD display, and the memory and LCD display are connected to the main control module; the pressure signal acquisition and conversion module passes through the A / D The D converter is connected to the main control module, and the pressure signal acquisition and conversion module is used to quickly and linearly convert the pressure value of the helmet during the helmet puncture test into a voltage signal (for example, the input force value 0-2000N corresponds to the output voltage 0-10V), the A / D converter quickly converts the voltage signal into a digital signal that the main control module can receive and process (for example, 40ms acquisiti...

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Abstract

The invention provides a safety helmet quality detection system and detection method based on time-domain transient analysis. The detection system comprises a main control module, a pressure signal acquisition and conversion module, an A / D converter, a memory and a liquid crystal display screen. The detection method is characterized in that, by recording force values of all force process, and carrying out differential algorithm analysis on stress waveform thereof, a slope change process of the whole waveform is obtained, and if the slope change value is large, there is a sudden change in the force value, so that products, which seem qualified but are actually not qualified, are analyzed. According to the scheme, in the process of safety helmet puncture test, rapid and accurate detection and judgment can be realized, misdiagnosis can be prevented, and waveform and judgment parameters are displayed visually on a liquid crystal screen; and the detection method is stable and reliable and high in accuracy, overcomes limit of traditional thinking and has a wide popularization and practical value.

Description

technical field [0001] The invention relates to the field of helmet quality detection, in particular to a safety helmet quality detection system and detection method based on time-domain transient analysis. Background technique [0002] The safety helmet test equipment currently produced and sold in China is mainly designed and produced with reference to GB / T 2812-2006 "Helmet Test Method". After heating for about 20 minutes, lift the hammer with your left hand, put the helmet on the head mold with your right hand and fix it; (2) Click the down button, the motor will reverse, and the lifting frame will run from bottom to top. When it reaches the lower limit, That is, when it is in full contact with the falling hammer, the lifting frame stops running and absorbs the falling hammer; click the up button, the motor rotates forward, the lifting frame and the heavy hammer rise synchronously, and when they rise to a height of about 1m, the lifting frame and the falling hammer stop ...

Claims

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Application Information

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IPC IPC(8): G01M13/00G01M7/08G01N3/30
CPCG01M7/08G01M13/00G01N3/30
Inventor 秦浩华于营波邵巍池荣虎郝胜武王涛王明甲
Owner 青岛普洛斯科技有限公司
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