Control method of sounding rod to follow up charge level

Abstract

The invention relates to a control method of a sounding rod to follow up a charge level. An AC (alternating current) frequency converter is controlled to complete the discharge of the sounding rod, follow up the charge level and lift up the sounding rod, and a PLC (programmable logic controller) makes an instruction, and is communicated with a frequency converter to send out a measurement starting command to the frequency converter, and the actual rotation speed of an increment type encoder measuring motor. The method comprises the following steps that (1) when the material is distributed on the top of a furnace, the PLC controller sends out the start command to the frequency converter; (2) the frequency converter runs, the sounding rod is opened, and the sounding rod lifts down at a constant control mode; and (3) the frequency converter monitors the motor torque and the torque mutation, the frequency converter judges that the sounding rod has reached the charge level, the sounding rod is slightly and upwards lift up, and the sounding rod is discharged till reaching to a stock level. According to the technical scheme, the passive follow-up mode is changed into an active mode, the sounding rod carries out the spot measurement of the charge level at a tinny amplitude after reaching the charge level, the running status of the sounding rod is completely controlled by the frequency converter, the tightness of a chain can be kept, and the burying of the sounding rod caused by the collapsed material can be avoided.

Description

technical field [0001] The invention relates to a blast furnace roof and a feeding system, in particular to a method for controlling a probe following a material level in the blast furnace roof and feeding system. 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. At present, most of the probes of domestic large-scale blast furnaces are driven by AC asynchronous motors, and the core control unit is the AC frequency converter. The probes are lowered to the material surface at a constant speed or constant torque. Switch to the mode of supporting the ruler so that the probe is upright and can follow the material surface. When the probe follows the material surface, the probe adopts a constant torque ...

AI Technical Summary

Problems solved by technology

At present, most of the probes of domestic large-scale blast furnaces are driven by AC asynchronous motors, and the core control unit is the AC frequency converter. The probes are lowered to the material surface at a constant speed or constant torque. Switch to the mode of supporting the ruler so that the probe is upright and can follow the material surface. When the probe follows the material surface, the probe adopts a constant torque control method, that is, the speed-adjusting frequency converter outputs a constant upward pulling force. Under the action, it can be lowered slowly with the material surface, and the chain can maintain a tight state under the action of tension. The setting of the tension is very important. If the tension is set too high, the caliper may appear, and the probe cannot follow the material. If the tension setting is too small, the chain cannot be tightened, and the measurement error will increase; the probe is a way of passively following the material surface, relying on the gravity of the probe itself to complete the task of following the material surface, the biggest defect of this method is It is very difficult to set the pulling force. There are many factors that determine the pulling force, such as the quality of the probe, the quality of the chain, and the friction between the chain and the roller. The bottom passively follows the material surface. In this process, because the gravity is greater than the pulling force, the probe will move at an accelerated speed, which will lead to serious accidents of inverted hammer and buried hammer.

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