Method for preventing overload elevation of direct-current elevator of main shaft of coal mine

Abstract

The invention discloses a method for preventing the overload elevation of a direct-current elevator of a main shaft of a coal mine. The method is implemented as follows: a fixed area is arranged at a constant-speed running section of a hoisting container in the main shaft, when an ascending hoisting container enters the fixed area, the armature current of a direct-current motor is detected and iscompared with the current reference value of the elevator in the normal work state, if the measured value is smaller than the reference value, the condition that the coals in the ascending hosting container are not discharged completely is judged, then the sound and light alarm is conducted, a loading station is blocked, the loading operation is paused, and the hoisting container in which the coals are not discharged completely is hoisted to the unloading position for secondary unloading in a manual elevating manner until the coals are discharged completely, so that the hoisting container is prevented from loading under the condition that the coals are not discharged completely, the potential safety hazard caused by the overload hoisting of the elevator is eliminated, and the safe runningreliability of the elevator of the main shaft is improved.

Description

technical field [0001] The invention belongs to the control technology of a DC hoist in a main shaft, and relates to a method for preventing the DC hoist of a coal mine main shaft from being overloaded and lifted. Background technique [0002] In order to improve production efficiency, in the normal production process, the main shaft DC hoist is usually lifted in an "automatic" manner. In the automatic lifting mode, the DC electric control system takes the "clean discharge" signal from the quantitative hopper of the underground loading station as the start-up signal of the hoist in the main shaft. After the hoisting control system receives the start-up signal, the main shaft hoist is automatically lifted, and reaches the parking position after going through various stages of the hoisting speed diagram. The ascending lifting container is unloaded, and the descending lifting container is loaded by the underground loading station. After the quantitative bucket of the loading ...

AI Technical Summary

Problems solved by technology

[0003] Since the start-up signal of the DC hoist in the main shaft is based on the "clean unloading" signal of the quantitative hopper at the loading station, if the raw coal contains a large amount of moisture, it may cause the upward lifting container to fail to unload the coal during the loading cycle of the downward lifting container clean

Then, in the next lifting process, if the container is loaded without being unloaded and cleaned, it will cause the main shaft DC hoist to be overloaded and lifted, and at least it will cause the DC motor driving the main shaft hoist to overload and heat up, which will affect the main engine. And the service life of the steel rope, if it is heavy, the lifting will not move, and the overweight lifting container will slip backwards, which may cause serious overwinding accidents