Lump coal bunker automatic unloading method

Abstract

Disclosed is a lump coal bunker automatic unloading method. The lump coal bunker automatic unloading method includes the following steps that an ultrasonic wave sensor is added on a portion of an unloading dolly, where a coal falling groove is located, drop signals fed back by the ultrasonic wave sensor are collected by a programmable logic controller (PLC) in periodicity mode, and the result that whether the dolly moves or not is confirmed after the drop signals are compared with a set numerical value; when the unloading dolly moves, the PLC sends signals to a coal feeding hand wheel above a belt and enables the coal feeding hand wheel to stop feeding lump coal and a plow unloading machine of the unloading dolly is uplifted firstly, and then the whole unloading dolly moves forwards; when the unloading dolly moves to the terminal point of a coal bunker, the unloading dolly automatically returns to the initial point of the coal bunker, and the unloading dolly runs in continuous circulation mode. The lump coal bunker automatic unloading method is high in automatic degree, accurate in drop control, and safe, reliable and efficient in run, achieves work environment optimization of employees, prevents the employees from working in a work environment large in noise intensity and large in dust quantity for a long term, guarantees health of the employees, can guarantee continuity and reliability of production, guarantees that dropping points of the lump coal are located in a prescribed range, guarantees production rate of the lump coal, and improves economic benefit.

Description

technical field [0001] The invention relates to an automatic unloading method for a coal bunker in a coal preparation plant. Background technique [0002] From the completion of production to storage in the warehouse, the crushing rate of lump coal is as high as 25%, and the price of lump coal is generally 1.5 times that of fine coal. Therefore, increasing the proportion of lump coal has become an important growth point for the production profit of coal preparation plants . The unloading trolley of the raw coal bunker is manually operated. In the continuous production process, in order to ensure a good anti-breakage effect, the height difference of coal falling must be within the specified range, and the post personnel need to frequently operate the button to move the unloading. The trolley performs drop control. This method of operation mainly has two defects: 1. Not only can it not control the height in time and accurately, resulting in the occurrence of bunkering or exc...

AI Technical Summary

Problems solved by technology

This method of operation mainly has two defects: 1. Not only can it not control the height in time and accurately, resulting in the occurrence of bunkering or excessive crushing of lump coal, but also the labor intensity is high and the operation efficiency is low; 2. Dust, noise Such as large pollution, it is easy to cause many adverse effects on the physical and mental health of the staff