Method for preventing elevator from elevation caused by secondary fault

Abstract

The invention relates to a method for preventing elevator from elevation caused by a secondary fault. The basic functions of an existing elevator APS (automatic protection switching), an elevator PLC (programmable logic controller) and a coke tank car PLC (programmable logic controller) are utilized; under the condition of not adding equipment, the accidental elevation of the elevator due to the secondary fault can be eliminated by proper condition selection, reasonable time setting and scientific program design, thus time for production cycling is stable, the labor intensity of post workers and unnecessary personnel monitoring can be reduced, and the frequencies and time of maintenance and debugging can be reduced; the accidents that coke tanks hang and fall, a hook head is bent, a limitswitch is broken, basic structure deforms and the like can be avoided, thus saving spare parts and maintenance cost. The whole dry quenching system stably operates, the yield of dry quenching coke isimproved, and the annual cost is greatly saved.

Description

technical field [0001] The invention belongs to the field of electrical automatic control, and in particular relates to a method for avoiding secondary fault lifting of a CDQ hoist in a coking plant. Background technique [0002] The hoist is an indispensable and important mechanical equipment for coke CDQ shipment in coking plants. Its entire operation process is automatically interlocked with related equipment through the hoist programmable logic controller (hereinafter referred to as hoist PLC). The original design procedure of the hoist is that when the empty coke tank drops to the hook opening limit, that is, when the hoist PLC commands the hook head to be in the open position, the automatic alignment device of the hoist (abbreviated as hoist APS) relaxes, and the CDQ of the coke tank is transported. The car walks and proceeds to the next cycle of work. However, once the APS of the hoist fails to release the limit, the action is timed out, and after a delay of 20s, the...

AI Technical Summary

Problems solved by technology

In addition, the interlocking time between the hoist and the lowering of the coke tank car is set to be short, only 20s, so once the time exceeds 20s, the coke tank will have a secondary failure to lift