Silica sol mould baking furnace:
1 The furnace lining is a full-fiber structure: that is, the side wall, the furnace door, and the top wall all adopt a fiber briquette structure. The high-aluminum heavy bricks and light bricks are used for the pressure resistance part of the trolley, and the thermal insulation bricks are used. High-purity refractory fiber furnace lining material has a small bulk density, a fire resistance of ≥1200 ° C, does not expand under heat shrinkage, and has a small thermal conductivity (fiber 0.13Kcal / mh ° C, and 0.6 lightweight bricks 0.3Kcal / mh ° C), and less heat storage. (The full fiber furnace wall is 17261KJ / m ?, while the refractory brick furnace wall is 453633KJ / m?). Compared with the brick wall of the same size, the all-fiber furnace lining structure has a faster heating speed, the installation power can be reduced by more than 20%, and the energy saving effect can reach 20-30%.2 heating elements: all use resistance tape (material is 0Cr27Al7Mo2). Heating element layout: side wall, back wall, furnace door, trolley on five sides. The mounting structure of the heating element adopts the current unique advanced technology. The original method for mounting the heating element of the fiber structure furnace lining is to use positioning metal pieces to extend from the furnace shell steel structure into the furnace and add metal element rods and porcelain sleeves, so that under high temperature conditions in the furnace, there is a large A part of the heat is transmitted to the steel structure of the furnace shell, which causes a serious thermal short circuit and large heat loss. At present, the method adopted by our company is to directly build the fiber blanket into the overall fiber furnace wall (the fiber compression is 35 ~ 40%). The special ceramic screw, namely the ceramic self-tapping screw and the ceramic gasket, can be used to quickly and easily connect the resistance The belt is fixed to the furnace wall. This method has no heat loss, convenient construction, effective use, and convenient maintenance. This method is currently widely used at home and abroad.
3 The furnace door is compressed by a spring compression mechanism. There are 4 shafts on both sides of the furnace door. A crank arm and a guide wheel are fixed at the end of the shaft. The guide wheels are placed in the left and right guide rails respectively. The middle part of the shaft is provided with a lifting rod. And elastic pull rod, when the furnace door rises, the tension and the door's own weight form a moment. The spring is pressed to make the shaft and drive the crank arm to rotate. The guide wheel on the crank arm is pushed in the guide rail to force the furnace door to move outward, and Get out of the oven before you can rise. When it is lowered, the opposite is true. When the furnace door falls on the trolley of the trolley, the pulling force and heavy moment disappear, and the spring force drives the shaft and the crank arm to rotate, pushing the furnace door closer to the furnace mouth, thereby achieving the purpose of sealing the furnace mouth.
3 Furnace doors and trolleys are equipped with protection devices and limit devices.
4In order to achieve the purpose of exhaust, the furnace top is added with a 200mm manual exhaust port.
5.Control and measurement system
5.1 Furnace temperature control is multi-zone temperature control, the temperature of the heating chamber is measured by thermocouple.
5.2 The temperature control instrument is a highly intelligent instrument produced by Shanghai Guolong, with PID online self-tuning and programming control, temperature control accuracy ≤ ± 1 ℃, adjustable power, two-way thyristor with self-cooling fan.
5.3 The recording instrument adopts Shanghai Dahua Garden chart recorder with over-temperature alarm.