Bushing plate temperature automatic control method

Abstract

The invention relates to a bushing plate temperature automatic control method which is characterized in that the temperature control process comprises the following steps that (1) the current bushingplate temperature is sampled; (2) the rising speed of the bushing plate temperature is calculated; (3) the rising temperature deviation of the bushing plate is calculated; (4) the speed change rate ofthe bushing plate temperature is calculated; (5) when the bushing plate temperature is excessively high, the output is disconnected and alarming is performed; and (6) when the bushing plate temperature is not excessively high, assignment of the calculation result is performed, and the bushing plate temperature is compared with the temperature threshold; the temperature rising speed and the speedchange rate are fuzzified when the bushing plate temperature is less than the temperature threshold and the u output is controlled after looking up the Fuzzy control table; and the u output is controlled after performing PID operation when the bushing plate temperature is greater than or equal to the temperature threshold. The original control method is improved by applying the adaptability of thefuzzy control system under the large-scale nonlinear control environment so that the disadvantages that automatic PID cannot be used in the control process and manual auxiliary control is required can be solved.

Description

Technical field: [0001] The invention relates to a method for automatically controlling the temperature of a drain plate. Background technique: [0002] At present, the number of platinum-rhodium alloy bushing plate equipment for drawing and forming in the glass fiber industry has also increased with the increase in production capacity. A tank kiln production line can have as few as dozens or as many as hundreds of drain plates working at the same time. At the same time, platinum drain plates are also easy to wear because of their high value, so they occupy an extremely important position in the glass fiber production process. In the bushing process, the temperature control of the bushing is the key link in the whole process. At the same time, it is a very important and common operation to heat up the leak plate. In a tank kiln production line, faced with so many drain plates, in daily production, when the temperature needs to be raised due to power failure, product change...

AI Technical Summary

Problems solved by technology

However, some inherent defects of PID itself still exist in the actual production control process. If the controlled object is in a nonlinear, time-varying, and uncertain working environment, the required mathematical model cannot be used. Traditional control It is difficult to obtain satisfactory results under such working conditions; at present, in the process of temperature control of the drain plate from the beginning of temperature rise to stable operation, the method of combining manual temperature rise control with automatic control is adopted, that is, the initial manual temperature rise control Temperature rise curve, after the temperature reaches the set index, it will be automatically controlled by PID. The whole process is complicated due to process requirements, operation steps and safety factors

In the production practice of this kind of operation mode, especially in the face of some unexpected situations such as power outages, the manual temperature rise control process has problems such as heavy workload and long recovery time, and there are many hidden dangers in the stability and safety of temperature control.

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