Ⅰ、Brief Introduction
Extrusion is a process used to create objects of a fixed cross-sectional profile. A material is pushed through a die of the desired cross-section. The two main advantages of this process over other manufacturing processes are its ability to create very complex cross-sections, and to work materials that are brittle, because the material only encounters compressive and shear stresses. It also forms parts with an excellent surface finish.
Extrusion may be continuous (theoretically producing indefinitely long material) or semi-continuous (producing many pieces). The extrusion process can be done with the material hot or cold. Commonly extruded materials include metals, polymers, ceramics, concrete, play dough, and foodstuffs. The products of extrusion are generally called “extrudates”.
Ⅱ、Characteristics
The main part of the plastic extruder is composed of extruder, extrusion system (machine), a transmission system and a heating and cooling system.
1.Movement of the extrusion with relation to the ram. If the die is held stationary and the ram moves towards it then it is called “direct extrusion”. If the ram is held stationary and the die moves towards the ram it is called “indirect extrusion”.
2.The position of the press, either vertical or horizontal.
3.The type of drive, either hydraulic or mechanical.
4.The type of load applied, either conventional (variable) or hydrostatic.
Ⅲ、Scheme
The control system is composed of HMI and PLC
HMI:LEVI-700L & LEVI-102L PLC:LX3V-1412MT & 2 Units LX3V-4LTC
In HMI, users can operate PLC to control frequency conversion equipment, then it can change the main rod speed of the equipment.LX3V-4LTC PLC can collect multi-channel temperature data, and it has PID function that application of PLC in Constant Temperature Control.
Ⅴ、Introduction of Program
HMI Program Screen
PLC Program Screen(Part)
Ⅵ、Summary
1、Plastic extruder is mainly used to heat temperature control, it has multi temperature control, so that ensure the stability of plastic extrusion.
2、In the daily,plastic extrusion machine work will be a variety of failures, workers are sometimes difficult to judge, and therefore requires a comprehensive alarm information.
Ⅶ、Picture of Equipment
