Extrusion granulating machine unit gear pump speed control system
A technology of extrusion granulation and speed control, applied in pump control, mechanical equipment, machine/engine, etc., can solve the problems of difficult to ensure product high performance, high quality, poor control stability, low precision, etc., to achieve stable and accurate control. High, small overshoot, fast response
Inactive Publication Date: 2008-11-12
恒力石化股份有限公司
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Problems solved by technology
At present, the speed adjustment of the gear pump is manually controlled, which has poor control stability, low precision and time delay, and it is difficult to guarantee the high performance and high quality of the product.
Method used
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[0010] Such as figure 1 In the gear pump speed control system of the extrusion granulation unit shown, the outlet of the front barrel 6 of the gear pump is connected to the gear pump 5, the gear pump is connected to the rear barrel 4 of the gear pump, and the gear pump motor 3 is a DC or frequency conversion motor. The motor is connected with a speed regulating device 2, and a melt pressure sensor 7 is installed on the front barrel of the gear pump. The melt pressure sensor measures the actual value of the melt pressure at the inlet of the gear pump, and converts the pressure signal into The 4-20mA signal output is transmitted to the controller 1, the controller adopts PID control, and the software control is as follows figure 2 As shown, the system pressure setting value is compared with the actual value of the melt pressure, the adjustment value of the gear pump speed is calculated by PID, and the current speed value of the gear pump is superimposed by the adder to calculat...
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The invention relates to extruding granulation equipment, in particular to a gear pump device of a large-sized extruding granulator set. A gear pump speed control system of the extruding granulator set is provided by the invention; an outlet of a front barrel of the gear pump is communicated with the gear pump which is communicated with a rear barrel of the gear pump, a motor of the gear pump is connected with a speed regulator, a fused mass pressure sensor used for measuring the actual value of the fused mass pressure at an inlet of the gear pump and transmitting a pressure signal to a controller is arranged on the front barrel of the gear pump, and after the signal processing, the controller is drivingly connected with the speed regulator. Compared with the existing manual operation for the control of pressure at the inlet of the gear pump, the gear pump speed control system has the advantages of automatic operation, promptness and accuracy, quick response, small overshoot, stable control and high precision, etc.; by utilizing the pressure of fused mass at the inlet of the gear pump to control the rotating speed of the motor of the gear pump, the pressure at the inlet of the gear pump device can be kept stable.
Description
technical field [0001] The invention relates to extrusion granulation equipment, in particular to a gear pump device in a large extrusion granulation unit. Background technique [0002] In the extrusion granulation unit, since the melt pressure in the cylinder directly affects the mixing and plasticizing effect of the molten material, if the pressure in the cylinder is unstable, it may lead to unstable product performance, so a gear pump is used to adjust the pressure The method is that the melt enters through the front barrel of the gear pump, and then enters the rear barrel of the gear pump after being adjusted to a suitable pressure by the gear pump, in order to maintain the stability of the inlet pressure of the gear pump, improve the uniformity of product performance, and improve product quality. At present, the speed adjustment of the gear pump is manually controlled, which has poor control stability, low precision and time delay, and it is difficult to guarantee the h...
Claims
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Login to View More IPC IPC(8): F04C14/08F04C14/24F04C14/00
Inventor 浦松王冬梅刘莉
Owner 恒力石化股份有限公司