大家玩彩票登录网址⎛⎝IfcLu⎠⎞ Germanjet displacement sensor control function of cold steel blast furnace flow valve - industry trends - Shenzhen easy test Electric Co., Ltd

爱博体育app

Website map

contact us

  • Shenzhen easie Electric Co., Ltd
  • Hotline: 137-2888-0902
  • Sales line: 0755-85271862
  • Fax: 0755-27083809
  • Email: info @ cn-opticfiber.com
  • Address: 5 / F, building 8, Honghai building, Hongxing community, Songgang street, Bao'an District, Shenzhen
  • website: http://cn-opticfiber.com

News Center

The function of controlling the material flow valve of cold steel blast furnace with germanjet displacement sensor

Release date: June 29, 2019 Hits: 123

Germanjet straight line in the control process of charging flow valve in cold steel blast furnace Displacement sensor The role of

The PLC control system of Siemens company is adopted in lenggang, which is responsible for collecting the actual opening value of the flow valve on the furnace top (by magnetostriction Displacement sensor The detection is converted to the actual angle), and receives the opening size and action command from the furnace top control system. After analysis and processing, the opening command is converted into an electrical signal of 4 ~ 20mA and sent to the integrated amplifier of the proportional valve to control the opening of the proportional valve. When the Siemens PLC outputs 12mA, the material flow valve is in the stop state; when the PLC outputs 16mA, the material flow valve opens, and when the PLC outputs 8Ma, the material flow valve is closed. The precision of this control method can reach about 0.8 degree.

The basic principle is: when the blast furnace receives the blanking instruction, PLC outputs 16mA current, the proportional valve coil is connected with 16mA current, the material flow valve cylinder is opened for unloading, and the actual opening of the material flow valve (through magnetostrictive displacement sensor When the angle of the material flow valve set by us is reached, PLC outputs 12mA current, the coil of proportional valve is connected with 12mA current, and the material flow valve is in the stop state immediately. At the same time, the solenoid valve of the material flow control valve namely the hydraulic lock is powered off, and the oil cylinder stops at the set angle position. When the charge is discharged, the coil of the material flow proportional valve is energized again. At the same time, the solenoid valve of the material flow control valve namely the hydraulic lock is powered on. When the cylinder of the material flow valve is fully opened, the coil of the material flow proportional valve is connected with a current of 12mA. At the same time, the solenoid valve of the material flow control valve namely the hydraulic lock loses power, and the material flow valve is in the stop state. When the full opening time is up, the coil of the material flow proportional valve is connected with 8 ma current again. At the same time, the solenoid valve of the material flow control valve is powered on, and the fuel cylinder of the material flow valve is closed. Because we have corrected the angle between the actual value of the flow valve opening and the set value of the flow valve opening, the error can not be greater than 0.8 degrees of positive and negative. This control mode can basically meet the distribution requirements of cold steel blast furnace, but the control accuracy is not high enough. Because the closed-loop control has not been realized, the continuous adjustment and control of the speed and thrust of the oil cylinder has not been realized Defects.

The improvement direction and ideas of cold steel flow valve control in the future. In order to make the system not only have larger thrust and rapidity, but also can achieve ideal accuracy, the goal of cold steel is to adopt the method of combining open-loop control and closed-loop control in the control mode of the material flow valve, so as to realize the continuous adjustment and control of the speed and thrust of the oil cylinder. It should be noted that due to the high amplification coefficient of hydraulic servo proportional system and the influence of natural frequency of mechanical system, if the parameters of PID adjustment (such as proportion, differential, integral coefficient, delay time, offset, etc.) are not adjusted well, the system is prone to oscillation, so the setting of PID parameters needs repeated tests to achieve The best results.

The basic principle is: when the material flow valve is opened for discharging, when the material flow valve is opened for discharging, the actual opening degree of the material flow valve (through the magnetostrictive displacement sensor When the flow valve angle set by cold steel is reached, the solenoid valve of material flow valve opening and material flow control valve are de energized, and the oil cylinder stops at the set angle position. When the charge is discharged, the solenoid valve and the solenoid valve of the material flow control valve are powered on again, and the material flow valve is fully opened. When the time is up, close the material flow valve. The biggest advantage of this method is that the control is simpler than the original control, and its hydraulic control schematic diagram.

Germanjet magnetostrictive displacement sensor Due to the advantages of reliable operation, high control precision and fast response speed, the application of material flow proportional valve has been successfully applied in cold steel blast furnace, and remarkable economic benefits have been obtained, which has made great contribution to the smooth and stable production of cold steel blast furnace.



Online Service
share share
Copyright: Shenzhen easie Electric Co., Ltd. record No Yue ICP Bei No. 19052563 Network security No. 44030602003587 Technical support: Xinghai Internet