Online detection system of steel plate surface cracks
A surface crack and detection system technology, which is applied in the analysis of solids using sonic/ultrasonic/infrasonic waves, can solve the problems that the detection results are not optimistic enough, the sensitivity and penetrating power cannot be considered, and achieve strong penetrating power and simple data processing operation. Effect
Inactive Publication Date: 2014-06-11
XIAN JIAOTONG UNIV JINGSHENG SCI & TECH DEV
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Problems solved by technology
On-line testing is mainly non-contact non-destructive testing. The current non-destructive testing methods are diverse, but none of them can meet the requirements of both sensitivity and penetration, and the test results are not optimistic enough.
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[0010] The present invention will be described in more detail below in conjunction with the accompanying drawings and embodiments.
[0011] As shown in the figure, the present invention is an online detection system for steel plate surface cracks, including a transmitting system and a receiving system: the transmitting system includes a low-frequency multivibrator and a high-frequency multivibrator, and the high-frequency multivibrator generates a A high-frequency pulse signal with a duty cycle of 50%, while a low-frequency multivibrator generates a low-frequency pulse signal with a duty cycle of 20%, the two pulse signals are input to the phase control circuit, and the phase control circuit converts the phase difference between the two pulse signals Locking, the output of the phase control circuit is connected to the logic control circuit to generate two pulse trains with equal amplitude and frequency but opposite phase. The pulse train is connected to the power amplifier circ...
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The invention provides an online detection system of steel plate surface cracks. The online detection system comprises a transmitting system and a receiving system, wherein the transmitting system comprises a low frequency multivibrator and a high frequency multivibrator, wherein pulse signals output by the two multivibrators are connected to a phase control circuit to lock the phase difference of the two paths of pulse signals, the output of the phase control circuit generates two columns of pulse strings with equal amplitude and frequency while opposite phases by a logic control circuit, the pulse strings are connected to a power amplifying circuit to be amplified to obtain two columns of waves, and the waves are coupled to a transmitting probe through a matching network; the receiving system comprises a receiving probe matched with the transmitting probe, and a signal received by the receiving probe is input to a computer for data processing after passing by a pre-amplification circuit, an amplifying circuit and a data collecting circuit.
Description
technical field [0001] The invention relates to the detection of steel plate surface cracks, in particular to an online detection system for steel plate surface cracks. Background technique [0002] Crack detection on the steel plate surface is an important procedure in the steel production process. With the development of industrial automation, it is urgent to conduct online detection to meet production needs. On-line testing is mainly non-contact non-destructive testing. The current non-destructive testing methods are diverse, but none of them can meet the requirements of both sensitivity and penetration, and the test results are not optimistic enough. Contents of the invention [0003] In order to overcome the shortcomings of the above-mentioned prior art, the object of the present invention is to provide a simple activity room, which has the characteristics of simple structure and convenient use. [0004] In order to achieve the above object, the technical scheme adop...
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IPC IPC(8): G01N29/04
Inventor 田边
Owner XIAN JIAOTONG UNIV JINGSHENG SCI & TECH DEV