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The mainframe of the waste plastic granulator is a extruding machine, which consists of a extrusion system, a transmission system and a heating and cooling system. We should energetically develop the regenerated resources and turn waste into treasure.

The extrusion system of extrusion system comprises a hopper, machine head, plastic extrusion system by plasticizing evenly into the melt, establish the pressure in this process and, by continuous screw extrusion die.

It is the main component of screw extruder, it is directly related to the scope of application of the extruder and productivity, made of alloy steel by high strength corrosion resistance.

The barrel is a metal cylinder made of composite steel pipe with heat resistance, high tensile strength, abrasion resistance, corrosion resistance of alloy steel or alloy steel lining. The machine barrel and screw are combined to realize the crushing, softening, melting, plasticizing, exhaust and compaction of the plastic, and transporting the rubber to the molding system continuously and evenly. The length of the general cylinder is 15~30 times of its diameter, in order to make the plastic fully heated and fully plasticized as the principle.

The hopper is arranged at the bottom of the hopper: cut off device, so as to adjust and cut off the material flow, the hopper side is provided with a sight hole metering device and calibration.

The head and die: die made of alloy steel and carbon steel inner sleeve is arranged in the outer sleeve, die mold. The role of the head is to transform the rotational plastic melt into parallel straight line motion, smoothly and evenly enter the mold sleeve, and endow plastic with the necessary molding pressure. Plastic in the cylinder plastic compaction, through the porous filter plate along the channel through the head neck into the die mold, mold die sleeve with the appropriate form, the annular space section decreases, the plastic melt formed around the tubular continuous dense core wire coating. In order to ensure that the plastic passage in the nose is reasonable and eliminate the dead angle of accumulated plastics, there are often diverted sleeves to eliminate pressure fluctuations during plastic extrusion and to set up even pressure rings. The die is also equipped with a mold correction and adjustment device to facilitate the adjustment and correction of the concentricity of the mold core and the mold sleeve. 2., the function of the transmission system is to drive the screw, to supply the torque and speed required in the extrusion process, usually composed of motor, reducer and bearing.

Heating and cooling device, heating and cooling is a necessary condition for the plastic extrusion process can be performed.

In 2013 the extruder is usually divided into electric heating, resistance heating and induction heating, heating installed in the fuselage, neck, head of each part. The heating device is heated by the external heating of the plastic in the cylinder to reach the temperature needed for the process.

The cooling device is to ensure that the plastic in the temperature range of the process requirements and settings. Specifically, it is to eliminate the excess heat generated by the shear friction of the screw rotation, so as to avoid the high temperature to make the plastic decomposition, coke burning or setting difficult. Cylinder cooling water cooling and air cooling is divided into two kinds, small and medium sized extrusion machine adopts air cooling is more appropriate, large use more water or two kinds of combined cooling; cooling water cooling screw mainly adopts the center, the purpose is to increase the solids conveying rate, stable glue volume, and improve product quality; but in the cooling hopper one is, in order to strengthen transport of solid material, prevent warming plastic sticky jam outlet, two is to ensure the normal work of the transmission part.

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