Yarn Package Dyeing Machine special control technology

1 Liquid level differential pressure analog detection control. The traditional liquid level is measured by the flap level gauge. In the specific use, in order to ensure that the liquor ratio remains unchanged, the liquid level limit switch must be adjusted by people, resulting in a large error and the reproduction of dyeing. influential. Using differential pressure analog liquid level detection, the liquor ratio can be controlled more accurately. When the liquid level changes due to the continuous adsorption of the dyed material after entering the water, it can automatically perform one, two or multiple water entry compensation to ensure the accuracy of the liquor ratio.

2 Detection and control of dye liquor circulation flow

The circulating flow of dye liquor has a great influence on the dyeing process and even the final quality of the dyed material. In the early days, the flow rate of the tube dyeing machine was adjusted through the throttle valve set at the outlet of the main pump, but this control was discontinuous. Because it is set by the operator's experience, the flow control is very unstable, and the efficiency of the main pump is reduced.

The principle of advanced dye liquor circulation flow control is to control the flow in real time according to different yarn types and different time periods in the same dyeing process (such as different temperature periods in the heating process, time periods of heat preservation). It is a control system composed of main pump motor AC frequency conversion speed regulation, PLC and computer, giving flow and head characteristic curves under different main pump rotation speeds, and ensuring the main pump efficiency remains unchanged. This is the synchronous dyeing control technology mentioned earlier.

Through the effective control of the dye liquor flow, not only the dyeing quality of the yarn and the reproducibility of the dyeing process can be ensured, but also the power consumption can be saved.

3 temperature, feeding ratio control

The precise control of heating, especially the control of low heating rate, is particularly important for the dyeing process. Through the setting of the temperature proportional control valve program. Temperature proportional control can be performed effectively. The feeding ratio control is a control system composed of a feeding ratio regulating valve and a PLC program according to the requirements of controlled dyeing, and completes the process of dye and auxiliaries segmentation, measurement and injection speed. It plays a vital role in ensuring the dyeing quality.

4 pH value detection device

At present, some relatively advanced equipments are equipped with this kind of device, which is very useful from the perspective of dyeing process. It can accurately detect and control the pH value of the dye solution at any time, and effectively control the process of dyeing and color fixing, but this device is relatively expensive and the application is not very popular.

5 Central control

Since there are many dyeing machines in general dyeing factories, ranging from 10 to 10, the use efficiency of equipment and process management are more important. The use of central control can better centrally control the dyeing process, improve the efficiency of equipment use, and eliminate the human influence factors of stand-alone operation. At present, this control technology has been widely used and obtained good economic benefits.