The composition of twin screw

Twin screw extruder extrusion system (screw and barrel), transmission structure (reducer box, bearing and motor), feeding system, heating and cooling structure and control system is composed of five parts, and single screw extruder is different, twin screw extruder barrel has two screw, screw bearing specifications and layout is more complex.
EXTRUSION SYSTEM
1. Screw structure
Is the main part of the extruder, twin screw screw tooth shape does not conform to the rules, can not form a closed line of engagement, belongs to the non-sealed type. Screw self-locking, driven by gears, master and slave screw do not directly contact
2. Barrel structure
The utility model relates to a metal cylinder with heat resistance, wear resistance and corrosion resistance. The combination of barrel and screw achieves the mixing, gelatinization and curing of materials. The barrel structure of twin-screw extruder is the same as the barrel structure of single-screw extruder, which is also divided into integral barrel and segmented combined barrel. In twin-screw extruder, in order to replace easily, generally use the segmented barrel.
TRANSMISSION STRUCTURE
The function of the transmission system is to drive the screw and supply the torque and speed required by the screw in the extrusion process. It is usually composed of a motor, a gearbox and a bearing.
The axial force produced by the twin screw in the extrusion work and the axial force produced by the single screw in the extrusion work is similar or higher than the axial force of the single screw extrusion, such a large axial force should need larger specifications of bearings to bear, however, because of the layout of the twin screw work limits the bearing bearing axial force with the layout space, so the bearing layout has many schemes.

FEEDING SYSTEM
According to the characteristics of extruded materials and the requirements of working conditions, the feeding system of twin screw extruder adopts the forced metering feeding mode for the barrel.
The feeding device is like a single screw extruder that works independently. The screw that turns the material is driven by an electric motor through the output shaft of the worm gear reducer. The speed of the screw conveying raw materials and the size of the conveying material are determined by the working speed of the twin screw extruder and the pressure of the barrel. The thread on the thread rod of the feeding device can be single head or double head, and the most commonly used is single head thread.
HEATING AND COOLING STRUCTURE
Heating and cooling are the basic conditions of extruder work. The heating on the twin screw host is generally completed by stainless steel heating ring. A water channel is reserved inside the barrel to reduce the temperature of the barrel through the circulation of water. The heating ring and cooling water cooperate with each other to maintain the temperature inside the barrel at the temperature we need
CONTROL SYSTEM
Control the operation and stop of twin-screw extruder.