Stepping beam lifting synchronous control method of stepping plate blank heating furnace

Abstract

The invention discloses a stepping beam lifting synchronous control method of a stepping plate blank heating furnace, comprising the following steps of: adjusting the set value of a speed by mainly using a molten steel side beam to ensure that the molten steel side beam completes the corresponding stroke with the set time according to the set speed; using the molten steel side beam as the reference datum for the lifting of a finished steel side beam, obtaining the position differential of the two beams according to the measuring valve of a displacement sensor, and then calculating the speed compensating value of the finished steel side beam; using the speed compensating value outputted by a PID controller as the output of a PLC and correcting the lifting speed of the finished steel side beam in real time so that the finished steel side beam follows the molten steel side beam in real time, and then realizing the synchronous running of the lifting. In the invention, the position differential of the two beams is controlled within 10 millimeters so that the heating quality of the plate blank is ensured, and then the stepping beam is protected. Meanwhile, the invention reduces the failure rate, reduces the maintenance time of equipment, enhances the heating efficiency, lowers the cost and increases the benefits.

Description

technical field [0001] The invention relates to a method for controlling a walking slab heating furnace in the metallurgical industry, in particular to a method for synchronously controlling the lifting and lowering of a walking beam of a walking slab heating furnace. Background technique [0002] At present, the walking beam of the walking slab heating furnace is divided into two types: one-stage type and two-stage type. The application purpose of the two-stage walking beam is mainly to send the slab to the heating section as soon as possible in the case of hot charging, so as to improve the production rhythm, so as to achieve the purpose of increasing production and saving energy. Two-section walking beam Each section of the beam is an independent mechanical device, each driven by a set of hydraulic system, which can be lifted and translated independently, or connected together to lift and translate at the same time, each section of the beam has two displacement sensors T...

AI Technical Summary

Problems solved by technology

The speed given for the lifting and translation of the walking beam can only be adjusted manually through these adjustable resistors, and the PLC cannot automatically control the speed of the walking beam in real time

Since the two sections of beams are independent, the conditions of their mechanical devices and hydraulic systems will have different changes as the running time advances, and because the slab is a large billet, with the loading, tapping and transportation of the billet in the furnace, each The load carried changes greatly at any time, and the adjustable resistance will also produce a certain drift, etc. When the two sections of the beam are connected together to lift and translate at the same time, the lifting and lowering of the walking beam will often be out of sync due to the above conditions , it is necessary to adjust the adjustable resistance frequently; and in the case of amplifier board failure, when replacing the amplifier board, there are many parameters to be adjusted and it takes a long time; on the other hand, it is difficult to adjust the adjustable resistance, and the adjustment range is limited

When the walking beam is not synchronized, it will cause unpredictable and uncontrollable front and rear deviation of the position of the slab at the joint of the two beams in the furnace, which will affect the heating quality and seriously cause damage to the walking beam

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