Transmission system:
The role of the transmission system is to drive the screw, the screw supply in the extrusion process, the torque and speed, usually by the motor, reducer and bearings, etc..
Under the premise of the same structure, the manufacturing cost of the reducer is roughly proportional to its size and weight. Because of the shape and weight of the reducer, which means that the material used in the production of more materials, the use of the bearings are also relatively large, so that manufacturing costs increase.
The same diameter screw extruder, high speed and high efficiency extruder than the conventional extruder consumed more energy, motor power doubled, the speed of the corresponding increase in the speed of the chassis is necessary. But the high screw speed means a low reduction ratio. The same size of the reducer, the low speed ratio and the large gear ratio, the gear modulus increases, the load capacity of the reducer also increased. Therefore, the increase of the volume weight of the reducer is not proportional to the increase of the motor power. If the output divided by the speed reducer as denominator, weight, high speed and high efficiency extruder was small, large number of ordinary extruder.
In order to yield per unit, high speed and high efficiency extruder motor power is small and the weight of the reducer is small, which means that the high speed and high efficiency extruder production per unit cost is lower than that of the conventional extruder.
Heating and cooling device:
Heating and cooling are the necessary conditions for the extrusion process.
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 made up of the plastic in the external heating cylinder so as to increase the temperature required for the operation.
The cooling device is to ensure that the plastic in the temperature range of the process requirements and settings. In order to avoid the excess heat generated by the shear friction of the screw rotation, in order to avoid the high temperature, the plastic decomposition, scorch or stereotypes are 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.