System and method for detecting cracks of chain of scraper conveyor

Abstract

The invention discloses a system and method for detecting cracks of a chain of a scraper conveyor. The system comprises a plurality of detection circuits which are disposed around the peripheral wall of a driving chain wheel, are correspondingly and uniformly distributed according to the distribution distance of a chain ring, and are used for receiving an excitation signal to generate an alternating magnetic field, and obtaining a feedback signal generated by electromagnetic induction with the chain ring, a trigger circuit used for generating a position trigger signal every time turning each basic chain ring structure, and a control device. The control device is used for receiving all position trigger signals in the rotation process of the driving chain wheel and selecting the detection circuit at the test position to execute a test every time one position trigger signal is received, and each test comprises the following steps of sending the excitation signal to the detection circuit, and when the feedback signal is abnormal, determining that the basic chain ring structure corresponding to the currently excited detection circuit has a crack. The system is low in input cost and high in reliability, realizes dynamic crack detection of the scraper chain ring, and can adapt to the reliability requirement of severe working conditions.

Description

technical field [0001] The invention relates to the field of scraper conveyor testing, in particular to a system and method for detecting cracks in a scraper conveyor chain. Background technique [0002] The scraper conveyor is an important part of the fully mechanized mining face and an important link in the coal transportation process. The first part of the transportation link of the fully mechanized mining face is the scraper conveyor, and then the coal is transported to the designated area through the transfer machine and the belt conveyor. Therefore, the stability of the scraper conveyor determines the mining efficiency. The scraper conveyor is mainly composed of a head, a middle trough, a tail, a scraper chain and related accessories. Among the various components, the scraper chain and the scraper are always in motion during the operation of the equipment. They are the key components for conveying materials. They are also the most prone to problems during the actual u...

AI Technical Summary

Problems solved by technology

The working environment of the scraper conveyor is relatively harsh. The environment is often full of coal dust, and the chain and scraper of the scraper conveyor often have coal slime. These conditions limit many current crack detection methods.

For example, the crack detection method of industrial camera scanning plus machine vision algorithm processing is widely used in other scenarios, but it is not suitable for this scenario, because the application environment is dusty, it is impossible to keep the camera lens clean, and the chain link test parts are blocked by each other. Area camera scan cannot cover

For another example, technologies such as ultrasonic flaw detection, penetrant flaw detection, and magnetic particle flaw detection can also be used for accurate detection of chain links, but they are generally only suitable for static detection, and it is difficult to realize dynamic detection when the scraper conveyor is running.

For another example, detection methods such as eddy current, electromagnetic ultrasound, and strain deformation acquisition are difficult to be widely promoted due to the inconvenient installation and placement of sensors and the high cost of equipment.

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