A Precise Temperature Control Method Against Disturbance in Heating Section of Tunnel Oven

Abstract

The invention provides an accurate temperature control method for tunnel oven heating section disturbance resisting. The temperature of a bottle conveying channel in a high-temperature section in an oven is detected so as to control the heating pipe power, and when the constant difference value exists between the detected actual temperature and the preset temperature, the corresponding draught fanpower is adjusted, the air supply volume is controlled, and dynamic balance of the temperature in an oven body is guaranteed. According to the temperature control method, the unpredictable disturbance of an air supply environment heat cycle system can be automatically eliminated, more accurate control over the heating section temperature can be achieved, and the adjusting time is shorter.

Description

technical field [0001] The invention belongs to the control field of drying equipment, and in particular relates to an anti-disturbance precise temperature control method for a heating section of a tunnel oven. Background technique [0002] The tunnel oven is mainly used to dry and sterilize oral liquid bottles, vials and ampoules, and remove pyrogens. The stability and uniformity of temperature control in the heating section are particularly important. Unstable temperature control and poor uniformity will lead to drug packaging materials (soda-lime glass bottles, low borosilicate bottles, etc.) due to uneven heating, which makes the bottle packaging materials prone to explosion and broken bottles, and glass debris will contaminate other bottles Packaging materials and the internal environment of the oven affect product quality. [0003] In the prior art, a patent with publication number CN106556229A discloses a temperature control method for a tunnel-type sterilizing drye...

AI Technical Summary

Problems solved by technology

However, due to the influence of the hot air circulation system and the uncertainty of the environment, there is a disturbance in the system, which leads to an imbalance between the given heat and the heat loss. In addition, the control area is large, and the change of environmental factors makes the final temperature control fluctuate greatly. The temperature is stable for a long time, and once the environment changes, the stability of the system changes and it takes a long time to stabilize

The temperature of the heating section of the tunnel-type sterilizing dryer in the prior art is controlled within ±15°C when fully loaded, and within ±10°C when no-loaded. Although this temperature range meets the requirements of relevant national regulations or standards, in actual production Once encountering poor-quality packaging materials, there will be a greater risk of frying bottles and breaking bottles

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