Non-contact photoelectric measurement method and device for bunker coal position

Abstract

The invention provides a non-contact photoelectric measurement method and device, which obtains the depth value of materials in a bunker on the basis of the number of pixels between a laser facula imaging spot and an image center spot in an image, belonging to the technical field of material position measurement. The invention is especially suitable for measuring the depth of the bunker coal position. In the device of the invention, a digital camera and a laser emitter are fixed on the top of the principal axis of a barrel-shaped bunker, so that the light path of the camera is vertical to the surface of material. The laser emitter is arranged on the position at the angle theta with the horizontal direction so as to ensure that the imaging zone of the laser facula can be projected on the material surface within the field range of the camera. The camera focuses by N-gear segment so as to satisfy the situation that clear images can be shot on all different coal positions of the bunker. DSP (Digital Signal Processor) serves as the inner core of a processor. The number of pixels between the laser facula imaging spot and the image center spot is calculated, and a depth table which is calibrated in advance and corresponds to different pixel number mean values is inquired to finish depth detection. The measurement device is composed of the digital camera, the laser emitter, the image processor and a real-time display module.

Description

technical field [0001] The invention provides a non-contact method, based on the number of pixels between the imaging point of the laser spot in the image and the center point of the image, and by querying the pre-calibrated depth table corresponding to the average value of different pixel numbers, various materials (granular) in the silo can be obtained. , powder) high reliability measurement method and device for level depth value, belonging to the technical field of level measurement. It is especially suitable for the depth measurement of the coal level in the mine coal bunker. The measuring device is mainly composed of CCD digital camera, laser emitter, image processor and image real-time display system. Background technique [0002] In order to make the mine production go on normally and give full play to the effectiveness of the equipment, various types of coal bunkers are generally installed between the main transportation links (such as the bottom of the mine, the m...

AI Technical Summary

Problems solved by technology

These methods have insurmountable defects in practical use

①During the measurement of the heavy hammer type, when the coal is stored in the bin, the heavy hammer will be buried due to the large change in the particle size of the raw coal, so that the servo motor cannot lift the heavy hammer, resulting in the coal level gauge not working

And because it is often impacted by the coal flow, it is easily damaged and the service life is difficult to guarantee; ② When the electrode type is measuring, a pair of electrodes can only measure a certain coal level, and electrodes installed at different heights in the raw coal bunker can measure coal of corresponding heights. bit

The conductivity of coal depends on the type and moisture content of coal. In actual use, the moisture content of raw coal from different sources and seasons varies greatly, which leads to great changes in the conductivity of different raw coals, often causing false signals on the coal level gauge. , causing an accident

③Nuclear level gauge not only has the problem of emission window pollution which is difficult to solve, but also it is difficult to ensure the safe use and storage of its radiation source, and it is expensive, so it is difficult to popularize and apply; ④Laser type level gauge has certain The detection accuracy is high, but at different coal positions, the electromagnetic wave reflection angle changes greatly. The rough coal surface not only has a strong absorbing effect, but also causes irregular scattering of reflected waves, which greatly affects the detection accuracy.

And it cannot solve the pollution problem of the laser emission window, so it is difficult to play a role

Therefore, none of these technologies has been able to maintain long-term, stable, safe, and reliable work over the years

Moreover, there is a common shortcoming in the above-mentioned methods, that is, the real scene in the coal bunker cannot be displayed while displaying the coal level. Therefore, once the material level information is inaccurate due to some influence, it will mislead the operator and cause an accident.

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