Trial rod inverse plummet resisting control method

Abstract

The invention relates to blast furnace top system, in particular to a trial rod inverse plummet resisting control method. The method sequentially comprises the following steps: firstly a rotary drum drives the trial rod to descend at constant first given speed; when the trial rod reaches charge level zone boundary, a PLC reads the signal by an absolute type encoder mounted on a reduction box, wherein the signal signals that the trial rod reaches the charge level zone boundary, then the PLC gives out an order to a frequency changer, after receiving the order, the frequency changer begins to control an asynchronous variable frequency motor to decelerate, the asynchronous variable frequency motor drives a gear reducer and the rotary drum to decelerate, and the rotary drum drives the trial rod to decelerate; when the trial rod decelerates to the second given speed, the PLC calculates according to the read data to obtain corrected torque of asynchronous variable frequency motor, then transmits the corrected torque of asynchronous variable frequency motor to the frequency changer, the frequency changer controls the trial rod to descend at constant speed according to the original torque set value and the corrected torque value of asynchronous variable frequency motor; and when the trial rod reaches charge level zone boundary, the asynchronous variable frequency motor converts output torque into rod holding torque under control of the frequency changer, and the trial rod acts along with the charge level.

Description

technical field [0001] The invention relates to a blast furnace top system, in particular to a method for controlling a probing rod anti-falling hammer. Background technique [0002] The probe is an important part of the blast furnace roof and charging system in the ironworks. During the working process, it can accurately indicate the height and distribution of the material level, so it plays an important role in the efficient and safe operation of the entire blast furnace system. Most of the probes of domestic large blast furnaces are driven by AC asynchronous motors, with AC speed-adjustable frequency converters as the core control unit, and the method of torque control is adopted, that is, a constant torque is given to let the probes go down, and it is automatically converted to The ruler mode makes the weight stand upright and follow the material surface. However, the distribution of the material surface is not a plane, but a slope with a high outside and a low inside,...

AI Technical Summary

Problems solved by technology

However, if the speed is too slow, calipers may appear, causing the probe to be unable to use normally; and it may also slow down the time of cloth, especially when there is a shortage of materials, which will affect the speed of blast furnace feeding.

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