Hot rolling mill rolling control system used for improving rolling accuracy

[0019] Specific embodiment one: reference figure 1 Detailed description of this embodiment, a hot rolling mill rolling control system for improving rolling accuracy described in this embodiment includes: a reduction control system 1, a hydraulic servo system 2, a signal processing module 3, a controller 4. Servo amplifier 5, servo valve 6, hydraulic cylinder 7, oil tank 8 and displacement sensor 9;

[0020] The displacement feedback signal output terminal of the displacement sensor 9 is connected to the feedback signal input terminal of the signal processing module 3; the control signal output terminal of the depression control system 1 is connected to the control signal input terminal of the hydraulic servo system 2, and the control signal output terminal of the hydraulic servo system 2 Connect to the control signal input terminal of the signal processing module 3. The signal processing module 3 is used to process the received signal to obtain the displacement difference. The difference signal output terminal of the signal processing module 3 is connected to the difference signal input of the controller 4 At the end, the amplified signal output end of the controller 4 is connected to the signal input end of the servo amplifier 5, and the signal output end of the servo amplifier 5 is connected to the signal input end of the servo valve 6;

[0021] The oil outlet of the oil tank 8 communicates with the oil inlet of the hydraulic cylinder 7 and forms an oil circuit, and the pipeline connecting the oil tank 8 and the oil circuit is provided with a servo valve 6;

[0022] The displacement sensor 9 is used to detect the displacement of the piston in the hydraulic cylinder 7.

[0023] When a rolling control system for a hot rolling mill for improving rolling accuracy is working, the reduction control system 1 sends a roll gap control signal to the hydraulic servo system 2, and then the hydraulic servo system 2 sends the roll gap control signal to The signal processing module 3 and the displacement sensor 9 detect the displacement of the piston in the hydraulic cylinder 7, and send the detected displacement signal to the signal processing module 3. The signal processing module 3 compares the received roll gap control signal with the displacement signal Make a difference and send the difference to the controller 4. The controller 4 amplifies the signal it receives and sends it to the servo amplifier 5 as a voltage signal. The servo amplifier 5 amplifies the voltage signal and outputs it with the voltage The current signal proportional to the signal is sent to the servo valve 6. The servo valve 6 converts the current signal into a hydraulic signal and amplifies the power to output a flow signal proportional to the current signal. The servo valve 6 controls the oil tank 8 to the hydraulic cylinder 7 according to the flow signal. When the difference between the roll gap control signal and the displacement signal of the hydraulic cylinder is 0, the current signal received by the servo valve 6 is 0. At this time, the servo valve 6 has no flow output, that is, the hydraulic cylinder stops moving. Realize constant roll gap rolling.

[0024] Specific embodiment two: according to a hot rolling mill rolling control system for improving rolling accuracy described in specific embodiment 1, in this embodiment, it further includes: a pressure sensor 10 and a switch 11;

[0025] The displacement feedback signal output terminal of the displacement sensor 9 is connected to a feedback signal input terminal of the switch 11, the pressure feedback signal output terminal of the pressure sensor 10 is connected to the other feedback signal input terminal of the switch 11, and the feedback signal output terminal of the switch 11 is connected The feedback signal input terminal of the signal processing module 3; the pressure sensor 10 is used to detect the pressure in the hydraulic cylinder 7.

[0026] A hot rolling mill rolling control system for improving rolling accuracy is working, when the switch 11 connects the pressure sensor 10 with the signal processing module 3, the depression control system 1 sends a pressure to the hydraulic servo system 2 Then the hydraulic servo system 2 sends the pressure command signal to the signal processing module 3. At the same time, the pressure sensor 10 detects the pressure in the hydraulic cylinder 7, and sends the detected pressure feedback signal to the signal processing module 3. The signal processing module 3 After comparing the pressure command signal received with the pressure feedback signal, make a difference, and send the difference to the controller 4. The controller 4 amplifies the received signal and sends it to the servo amplifier 5 as a voltage signal. The servo amplifier 5 amplifies the power of the voltage signal and outputs a current signal proportional to the voltage signal to the servo valve 6. The servo valve 6 converts the current signal into a hydraulic signal and amplifies the power, and outputs a flow signal proportional to the current signal , The servo valve 6 controls the oil delivery amount of the oil tank 8 to the hydraulic cylinder 7 according to the flow signal; during the rolling process of the rolling mill, when the screw is pressed down, the roller contacts the ingot, forming downward pressure on the ingot to make it Plastic deformation occurs, but at the same time, the ingot also forms an upward reaction force on the roll. Because there is a hydraulic cylinder 7 between the roll and the screw, load pressure is formed in the hydraulic cylinder. When the pressure command signal and the pressure feedback signal of the hydraulic cylinder When the difference is 0, the pressure in the hydraulic cylinder 7 remains unchanged, the load pressure is stable, and constant pressure rolling is finally realized.

[0027] Specific embodiment three: according to a hot rolling mill rolling control system for improving rolling accuracy described in specific embodiment 1, in this embodiment, it also includes: a cooler 12, which is used for the cooler 12 To cool down the oil in the oil tank 8.