How To Adjust The Temperature of The Glass Tempering Furnace? Heating And Cooling Control Methods

The working principle of a glass tempering furnace mainly relies on heating methods to change the tensile stress of glass, thereby giving ordinary glass tempering performance. In this process, the control of the temperature in the heating section is directly related to the effect of tempering. If the temperature is not controlled properly, problems such as warping, edge collapse, and furnace explosion may occur. So mastering how to adjust the temperature of the glass tempering furnace is crucial.

1. Heating temperature adjustment method for glass tempering furnace

1.1. One stage electric heating furnace

One stage electric heating is the arrangement of an electric heating element in the direction of glass operation, which is synchronously powered on and off. The power distribution of the heating wire is large at both ends and small in the middle. The advantage is that there are few temperature control circuits, and only about 20 Wen Dong circuits are needed for each furnace body. The operating cost is low, and the electric heating wire can be replaced without stopping the furnace. The disadvantage is that it cannot accurately control the temperature and is prone to uneven temperature distribution inside the furnace.

1.2. Multi stage heating furnace

Multi stage electric heating is the process of longitudinally distributing the furnace body into 3-4 sections, and setting different heating temperature values according to the different glass specifications of each batch. This allows for different temperature settings at various points on the heating furnace surface, allowing for more accurate and rapid adjustment of the furnace temperature. Let the glass absorb heat more evenly and synchronously. The specific temperature adjustment range is based on the heating temperature of the glass tempering furnace.

1.3. One furnace, two chamber heating furnace

One furnace with two chambers or adding a preheating furnace can solve the problem of uneven heating temperature rise on the upper and lower surfaces of glass caused by low radiation heat transfer efficiency at 300 ℃. At the same time, adding a preheating furnace can reduce waiting time and improve production efficiency. Our Yuegao Glass Tempering Furnace manufacturer has a variety of models and specifications of tempering furnace equipment, which can meet different production needs. Welcome to inquire and learn more.

1.4. Heat balance tube assisted heating

Using the principle of convective heat transfer, external compressed air with a certain pressure is longitudinally distributed in the heat balance tube and blown to the top and bottom of the glass. This can accelerate the heat transfer of the glass, balance the temperature difference between the top and bottom glass surfaces, accelerate the temperature neutralization of different positions in the furnace, and accelerate the temperature convergence of various parts of the glass.

The above mentioned how to adjust the temperature of the glass tempering furnace, and the temperature control methods for different furnace types in the heating part. Now, it is necessary to understand how to adjust the temperature during the cooling process.

2. Cooling method for glass tempering furnace

2.1. Natural cooling

When the glass tempering furnace needs to be shut down for more than three days, the natural cooling method can be used. Turn off the heating control switch, pull down the heating circuit breaker, turn off the power switch of the upper and lower platens, and the wind grid section, leaving only the heating main drive running. When the temperature naturally drops to 300 degrees, the main drive control and power switch can be turned off until the natural cooling occurs.

2.2. Emergency cooling

If there is sticking or explosion in the furnace, it is necessary to first turn off the heating control switch, pull down the heating circuit breaker, turn off the upper and lower plate platforms, wind grid sections, and power switches, leaving only the main heating transmission running. Open the furnace top cone valve and furnace door to accelerate air convection and let the temperature drop. When the furnace temperature drops below 600 degrees, raise the furnace body by 5cm, and then increase it by 5cm in half an hour, and so on. When the furnace temperature drops to 300 degrees, the furnace body can be raised to the top for cleaning. When the temperature drops to 200 degrees, a fan can be used to blow towards the furnace. When the temperature reaches around 50 degrees, the glass fragments on the roller conveyor and the lower iron plate can be cleaned.

2.3. Cleaning and cooling the furnace

Turn off the heating control switch, pull down the heating circuit breaker, and let the glass waste enter the furnace without heating and tempering. When the furnace temperature drops below 600 degrees, open the top cone valve and furnace door to accelerate air circulation. When the furnace temperature drops to 200 degrees, the furnace body will be heated. When the furnace temperature drops to 100 degrees, turn on the fans at the four corners of the furnace body to blow the furnace. When the temperature drops to about 30 degrees, manual cleaning work can be carried out.