Device and method for non-contact detection of pitch circle diameter of mine steel wire rope

Abstract

The invention provides a non-contact detection device and method for the pitch circle diameter of a steel wire rope for mining. The device comprises a laser, a video camera, a base, a signal processor, an imaging plate and an image vernier, wherein the base is fixed to a foundation platform, the laser, the video camera and the signal processor are arranged on the base, the laser irradiates directly at the steel wire rope, the central axis of a laser light curtain and the central axis of the steel wire rope are perpendicular to each other and are crossed, the imaging plate is arranged right in front of the laser, the image vernier is arranged on the side, facing the laser, of the imaging plate, and the laser and the video camera are connected to the signal processor. The laser is utilized to irradiate directly at the steel wire rope, the pitch circle diameter variation of the steel wire rope is detected through analyzing projection images formed on the imaging plate after the laser irradiates at the steel wire rope, and the high-precision non-contact dynamic detection of the steel wire rope can be realized through comprehensively applying the principles of projection imaging, displacement amplification and the like. The device is high in detection precision, is combined with reliability and convenience, and has wide practicability.

Description

technical field [0001] The invention relates to a detection device and method, in particular to a non-contact detection device and method for the pitch circle diameter of a mining steel wire rope suitable for coal mines. Background technique [0002] Mining steel wire rope is an important transmission and load-bearing component in the production process of coal mines in my country. It is widely used in various mine transportation and lifting equipment, such as shaft hoists. In the actual application of steel wire rope, due to the load, especially the long-distance and heavy-load dragging process, the diameter of the pitch circle will change with the change of the load. Therefore, the diameter of the steel wire rope pitch circle can reflect the tension of the steel wire rope and can be used to monitor the load change of the steel wire rope. At the same time, the change of the diameter of the pitch circle of the steel wire rope also reflects the change of the elongation of th...

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Problems solved by technology

[0004] Based on the above research status, there are mainly the following problems in the detection of the pitch circle diameter of mining steel wire ropes: first, the use of measuring tools such as vernier calipers for direct detection is a static detection, which is only suitable for the detection of steel wire ropes under static conditions; second, mining steel wire ropes are generally made of The thick-diameter steel wire rope wound by multiple strands has a non-standard circular cross-section, and there are gaps between the strands in the axial direction, which makes it difficult to accurately obtain the pitch circle diameter with measuring tools such as vernier calipers; Due to heavy-duty dragging, the steel wire rope moves along the axis, especially for shaft hoists and other equipment, the steel wire rope needs to be wound on the capstan wheel continuously, and the method of clamping the steel wire rope with resistors, capacitors, and inductance plates can only be installed on the equipment. At the end of the wire rope, the pitch circle diameter of the wire rope suspension point or the rope winding cannot be detected. The online detection of the wire rope moving along the axis needs to adopt a non-contact method, and there is a lack of corresponding research

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