The fire-retardant belt uses the core of the coal conveyor belt as the skeleton material, and the core is dragged under the traction motor of multiple traction motors, firstly through hair removal, drying, and then immersed in a paste prepared from various chemical raw materials, and then passed through a period of time. A long plasticizing oven (heat is supplied by a heat exchanger through a fan) is heated and dried. Finally, an extruder is used to heat and melt the PVG rubber (or PVC plastic) powder into a covering glue after being heated by a special mold. With the positive and negative sides of the core. Fire-retardant tape products have a variety of specifications ranging from 650mm to 1600mm and a variety of grades ranging from 5 to 13. Fire-retardant tapes of different specifications and grades require different coverage, thickness, and amounts of coating. The thickness of the covering rubber on both sides is also different. The amount of covering glue is determined by the rotation speed of the screw of the extruder, and the surface covering layer has a uniform thickness, strong adhesion, and good gloss. In order to ensure the quality of various products, the operating speed of the core must be coordinated with the speed of the screw of the extruder, and the response of the motor speed change should be quick. The operating speed of the core is determined by the speed of the six 5.5KW traction motors installed in different positions. The speed of the two extruder screws is determined by the motor speed of two 55KW extruders. The temperature of the plasticizing oven requires a constant temperature, which is achieved by controlling the number of 5.5 5.5KW heat fans with a digital temperature controller. Digital Microscope ,Eyeclops Digital Microscope,Lcd Digital Microscope,Wireless Digital Microscope Ningbo Beilun Kalinu Optoelectronic Technology Co.,Ltd , https://www.kalinueot.com