Summary of basic information of the new granulator

　The main machine of the plastic granulator is an extruder, which is composed of an extrusion system, a transmission system, and a heating and cooling system. Vigorously develop renewable resources and turn waste into treasure.

　　⒈Extrusion system The extrusion system includes a hopper and a machine head. The plastic is plasticized into a uniform melt through the extrusion system, and under the pressure established in this process, the screw is continuously extruded from the extrusion head.

　　1.1 Screw: It is the most important part of the extruder. It is directly related to the application range and productivity of the extruder. It is generally made of high-strength corrosion-resistant alloy steel.

　　 1.2 Barrel: It is a metal cylinder, generally made of alloy steel or composite steel pipe lined with alloy steel lined with heat resistance, high compressive strength, strong wear resistance, and corrosion resistance. The barrel cooperates with the screw to realize the crushing, softening, melting, plasticizing, exhausting and compacting of the plastic, and continuously and uniformly transport the rubber material to the molding system. The length of the general barrel is 15~30 times its diameter so that the plastic is fully heated and fully plasticized.

　　1.3 Hopper: The bottom of the hopper is equipped with a cutting device to adjust and cut off the material flow, and the side of the hopper is equipped with a sight hole and a calibration metering device.

　　1.4 Machine head and mold: The machine head is composed of an alloy steel inner sleeve and a carbon steel outer sleeve, and a molding die is installed in the machine head. The role of the machine head is to transform the plastic melt in rotary motion into parallel linear motion, which is evenly and smoothly introduced into the mold sleeve and gives the plastic the necessary molding pressure.

The plastic is plasticized and compacted in the barrel and flows into the die forming mold through the neck of the nose through the porous filter plate along a certain flow channel. A continuous and dense tubular coating is formed around the core wire. In order to ensure that the plastic flow channel in the machine head is reasonable and eliminate the dead corner of the accumulated plastic, a shunt sleeve is often arranged. In order to eliminate the pressure fluctuation during plastic extrusion, there are also pressure-equalizing rings. The machine head is also equipped with a mold correction and adjustment device, which is convenient for adjusting and correcting the concentricity of the mold core and the mold sleeve.

2. Transmission system The function of the transmission system is to drive the screw. The torque and speed required for the screw during the extrusion process are usually composed of motors, reducers, and bearings.

　　⒊Heating and cooling device Heating and cooling are the necessary conditions for the plastic extrusion process.

　　 3.1 In recent years, extruders usually use electric heating, which is divided into resistance heating and induction heating. The heating sheet is installed in the body, neck, and head. The heating device externally heats the plastic in the cylinder to make it warm up to reach the temperature required for the process operation.

　　3.2 The cooling device is set to ensure that the plastic is within the temperature range required by the process. Specifically, in order to eliminate the excess heat generated by the shear friction of the screw rotation, to avoid the temperature being too high to cause the plastic to decompose, scorch or styling difficult. Barrel cooling is divided into two types: water cooling and air cooling. Generally, small and medium-sized extruders are more suitable for air cooling, and large ones are mostly water cooling or a combination of two forms. , Stabilize the amount of glue, and improve product quality; but the cooling at the hopper is to strengthen the conveyance of solid materials and prevent the plastic particles from sticking to the material port due to temperature rise, and second, to ensure that the transmission part works normally.