A fiber grating intelligent monitoring device and monitoring method for coal level in coal bunker

Abstract

The invention discloses a fiber grating intelligent monitoring device and monitoring method for coal level in a coal bunker, including a support device, the support device is located above the coal bunker, the support device is detachably connected to a vibrating device, and the vibrating device extends into the inside of the coal bunker to vibrate The casing of the device is processed with a surrounding reserved slot, which is used to place the fiber grating sensor device, the fiber grating sensor device is connected to the fiber grating demodulator, the fiber grating demodulator is electrically connected to the data processing system, and the data processing system The alarm device is electrically connected, and the alarm device is connected with a tape conveyor. The invention relates to the change of light wave reflection of the fiber grating, which has fast response and high precision, can transmit the signal to the display device in the first time, and provides a good environment for the operation of the coal bunker; it is not interfered by the harsh environment of the coal bunker, It can stably monitor the coal level in real time; detect the shed coal phenomenon in time, and dredge the shed coal failure; easy to deploy and maintain, and low cost.

Description

technical field [0001] The invention relates to the technical field of coal mine equipment, in particular to an optical fiber grating intelligent monitoring device and monitoring method for coal level in coal bunkers. Background technique [0002] As coal mine production enters the development stage of the intelligent era, underground coal bunkers have become an important part of the connection between the mine and the mine. When the underground raw coal enters the coal bunker, it is often accompanied by a large amount of coal dust and large gangue. When the coal level in the coal bunker is too high, there will be a risk of lump coal overflow, which will directly cause damage to the belt conveyor. and casualties. When a large volume of coal or gangue falls in a relatively high humidity environment, shed coal phenomenon will occur, and it is difficult to find it in time, resulting in blockage of the coal bunker. When unloading coal at the bottom of the coal bunker, if there...

AI Technical Summary

Problems solved by technology

The environment of underground coal bunkers is full of complex factors, and the above mine coal level monitoring devices still have many deficiencies and defects

[0003] (1) During the working process of the radar coal level gauge, when the radar wave is transmitted to the coal surface, the radar wave will reflect in a chaotic direction due to the roughness of the coal surface, and some coal types have a strong resistance to the radar wave. Absorption, these factors greatly affect the monitoring accuracy of this coal level gauge

The environment of the underground coal bunker is harsh, often accompanied by coal powder and various volatile substances, which will accumulate on the surface of the transmitter end after a long time, which will seriously affect the transmission and reception of radar waves, and then make the monitoring mechanism invalid

[0004] (2) After the ultrasonic coal level gauge emits ultrasonic waves from the transmitting probe, the beam has a high probability of being reflected from the wall of the coal bunker, and the receiving probe cannot receive the wave signal

After the reflected wave reaches the other side of the warehouse wall, secondary reflections will occur. If these secondary reflected waves are received by the receiving probe, false signals will be generated, which will bring great errors to the monitoring.

In addition, the design and use of the ultrasonic coal level gauge are closely related to the diameter and depth ratio of the coal bunker. When the ratio of the diameter to depth of the coal bunker cannot meet the monitoring range of the ultrasonic coal level gauge, the monitoring results will be different from the actual Doesn't match, can't even monitor

The ultrasonic coal level gauge also requires the coal bunker to have a certain regular shape, and the inner wall of the coal bunker is smooth, which greatly reduces the scope of use of the ultrasonic coal level gauge in the mine.

[0005] (3) The laser coal level meter will also be affected by the harsh conditions of the underground coal bunker. In the case of high humidity, the coal powder will gather at the reflection end and the receiving end of the laser coal level meter, which will greatly reduce the coal level meter. measurement accuracy

The depth of the underground coal bunker is generally more than 40m, so the coal at such a high height will inevitably collide with the wall of the coal bunker during the falling process, and the impact force is very large. If it hits the laser coal level gauge installed on the wall of the bunker, the instrument will be directly damaged , the service life will be greatly reduced, and maintenance is also quite difficult

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