light industry

一、Overview of extruder
The plastic is made into a uniform melt through the extruder, and the pressure is formed under the pressure of the plastic, and the screw rod is continuously fixed with temperature. Most of the thermoplastic plastics are used in this method, there are many different types of screw extruder and specifications, the most commonly used extruder is the screw extruder. The Yi Chong Fei extrusion mainframe transmission ECF500 AC frequency converter, can fully meet the extrusion machine process requirements, after the actual operation of the years around the point of view, stable operation, strong adaptability to the product, economic benefits significantly.

二、Component of extrusion molding equipment
An extrusion equipment usually consists of the host (extruder), auxiliary machine and its control system. These components are usually referred to as extrusion units.
1 host
The main machine is composed of three parts, which are extrusion, transmission, heating and cooling. Extrusion system is mainly composed of a screw, a machine barrel, is a key part of extruder, plays a role in the transmission system is driven screw, to ensure that the screw in the working process with the torque and speed, heating and cooling system is mainly to ensure material and extrusion system in the processing of temperature control.
2 auxiliary
Composition of extrusion equipment and auxiliary equipment according to the types of products. In general, auxiliary by the agent through shaping device, cooling device, traction device, cutting device and product winding or stacking device etc. part.
3 control system
The control system of the extruder is mainly composed of electric appliance, meter and actuator:
(1) of main and auxiliary equipment of motor control, to meet the process requirements of the speed and power of the and ensure main, auxiliary engine can coordinated operation.
(2) the main and auxiliary control temperature, pressure and flow rate and the quality of products
(3) to realize the automatic control of the whole unit.

三、Control of traditional screw extruder
1) in the traditional screw extruder system, the screw is driven by DC motor. In the case of direct transmission, the screw is driven directly by the gear box; in the case of indirect transmission, the screw is driven by the belt and the traction drive. Traditional DC motor itself has some shortcomings, such as DC motor carbon brush every quarter to a replacement, in dust or corrosive environment in DC motor commutator spark increased. Result in abnormal operation.
2) the disadvantage of the indirect drive screw extruder is that there is a belt slip, which will cause a certain loss of power, and more mechanical devices increase the possibility of wear and failure. And the DC motor is the biggest drawbacks noise is too large, brush sparking, pollution of the rotor, the motor temperature is too high, inadequate exhaust and motor vibration. Therefore, the use of DC motor of the screw extruder maintenance costs higher, the initial cost of the DC motor is also higher.

四、The Yi chuangfei ECF500 series inverter transformation has the following characteristics
1) there are multiple input signal channels, which can receive analog signals from the sensor voltage, current, pulse, and so on. And multi segment speed, positive and negative inversion and 485 communication directly to a given frequency.
Technology requirements of the extruder is mainly to control the pressure of the outlet is constant, the equipment at the beginning of the work, the manual control speed, in order to achieve the demand pressure, real-time switch to pressure control.
2) automatic energy saving control, optimize the motor efficiency extruder of the main drive motor through parallel shaft helical gear reducer to drive the screw rotation, the basic frequency of the following changes in the speed of operation for the constant torque speed.
ECF500 series inverter with automatic energy saving control function, can automatically adjust the voltage according to the load situation, so that the motor running in the highest efficiency state.
3) torque limit and slip compensation torque limit and slip compensation function makes the output torque constant, the torque ripple is small, to meet the requirements of product technology.
The ECF500 series inverter used in the precise extrusion machine, which not only saves the electrical energy, more important is to improve the process, improve the quality of products, enhance the competitiveness of products.