A control method for the hydraulic system of the three major machines in front of the furnace for emergency operation

Abstract

The invention relates to a control method for emergency operation of a hydraulic system of furnace front three large machines and belongs to the technical field of automatic control. The problem that when a PLC system of the furnace front three large machines breaks down, the furnace front three large machines cannot continuously and stably operate is solved. Normal operation of hydraulic station equipment is rapidly achieved through control of conversion switches; a PLC control signal is cut off; the deceleration positions of the tapping machine and the clay gun machine are judged according to limiting switch signals; analog quantity signals are transmitted to a valve station proportional valve on the spot through signal transmitters so that the operating speed of the tapping machine and the operating speed of the clay gun machine can be changed; and thus, continuous and stable operation of the furnace front three large machines is ensured, the production process requirements are met, and sufficient time is also provided for processing a fault of the PLC system.

Description

technical field [0001] The method belongs to the technical field of automatic control, and provides a control method for ensuring the continuous and stable operation of the three main machines in front of the furnace when the PLC system fails. Background technique [0002] The blast furnace front system is one of the important links in blast furnace production. The three major machines in front of the furnace are the main equipment to ensure the normal production of the furnace. With the improvement of automation, the three machines in front of the furnace have also realized PLC automatic control. From the design point of view, once the PLC system fails, it will directly cause the hydraulic station equipment in front of the furnace to stop running, unable to provide power to the field equipment, and the emergency mode powered by the accumulator can only complete one tap hole blockage in front of the furnace If the normal operation of the PLC system cannot be restored in time...

AI Technical Summary

Problems solved by technology

[0002] The blast furnace front system is one of the important links in blast furnace production. The three major machines in front of the furnace are the main equipment to ensure the normal production of the furnace. With the improvement of automation, the three machines in front of the furnace have also realized PLC automatic control. From the design point of view, once the PLC system fails, it will directly cause the hydraulic station equipment in front of the furnace to stop running, and it will not be able to provide power to the field equipment, and the emergency mode powered by the accumulator can only complete one tap hole blockage in front of the furnace If the normal operation of the PLC system cannot be restored in time, it will directly cause the blast furnace to reduce or even stop the wind, and when the emergency mode is used, the 200bar pipeline and the 315bar pipeline in the hydraulic system are interconnected, which will affect the oil system and field equipment. The impact is very large, which can easily cause equipment damage or pipeline rupture. Therefore, it is extremely necessary to improve its control method and ensure that the three major machines in front of the furnace can work continuously and stably when the PLC system fails.

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