A Control Method for Preventing the Overflow of the Emulsion Return Oil Tank of the Continuous Rolling Mill

Abstract

The invention discloses a control method for preventing overflowing of an emulsion oil return box of a continuous rolling machine. The control method comprises the following contents: (1) a liquid level meter adopts a VEGAFLEX83 rod type radar liquid level meter; (2) a fixed box is mounted at the top of an oil return box; and a liquid level control device is mounted in a box body of the fixed box;(3) a control program sets an induction distance of a proximity switch 4 as 1.5 cm; when 1.5 cm is exceeded, signals are cut off; when an induction head is from the proximity switch by 1.5 cm, the proximity switch returns signals to a PLC through a LV06 cabinet; and the PLC controls startup of an electric control valve mounted on a pipe of an emulsion oil return system, so that the opening degreeof the electric control valve is increased to quickly discharge emulsion in the oil return box to prevent overflowing; and (4) parameters of a proportional integral controller PID of the electric control valve are P of 10%, I of 5 s and D of 0 s. The control method reduces the cost, improves the efficiency, reduces the equipment fault rate, and provides an effective and stable solution to emulsion overflowing faults.

Description

technical field [0001] The invention belongs to the electric automation and liquid level control technology of cold continuous rolling. Background technique [0002] The emulsion is mainly composed of about 97~99% water plus about 1~3% rolling oil after vigorous stirring. It plays the role of lubrication, cooling and cleaning during the rolling process, and is generally used for recycling. [0003] The emulsion system consists of the following six parts: net oil tank system, spray system, spray valve table system, oil return tank system, vacuum filter system and electromagnetic filter system. [0004] Technological process: In general, the emulsion in the net oil tanks 11 and 14 is pumped into the main pipeline for transporting the emulsion to the frame through five spray pump motors 1, and then each machine is controlled through the spray valve table according to the process requirements. The amount of emulsion spray required by the rack. There is an oil collecting pan 5 ...

AI Technical Summary

Problems solved by technology

[0007] 1. Sensor: The emulsion return oil tank level gauge uses an ultrasonic level gauge. Due to the complex working conditions on site, such as: the large steam in the oil tank makes a large number of water droplets adhere to the surface of the probe, resulting in measurement errors

[0008] 2. Valve opening: There is a regulating valve at the outlet of the oil return tank to control the liquid flow. If the valve cannot be opened in time, the liquid level will overflow

[0010] 4. The volume of the oil return tank: Compared with the diameter of the inlet and outlet pipes, the volume of the oil return tank is small. Under the action of the large-diameter inlet and outlet, the liquid level changes quickly, and the liquid level gauge has a certain response time, resulting in liquid level overflow.

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