Plastic machinery has become an important industry in the machinery industry due to the wide application of plastic products in industrial and agricultural production. Plastic machinery can save energy by applying variable frequency speed control technology (can save about 20~60%), reduce the impact on the power grid, realize green power consumption, and improve product quality and output.
There are many kinds of plastic machinery, such as plastic calender, plastic film blowing machine, plastic film bag sealing and cutting machine, injection molding machine, plastic trunking machine, plastic gusset machine, plastic pipe extruder, film extruder, molding machine, coating Plastic compound machine, wire drawing machine, kneader, plastic blowing machine, auxiliary machinery (air blower, liquid feeding, stirring, mixing), etc. Among the above plastic machines, such as a four-roll calender, etc., which require high synchronization precision, the others are extremely common production machines. The requirements for the drag system are basically the same.
1, can be smooth in a certain range of speed control is mainly to facilitate the production of different varieties of products.
2, starting and braking smooth plastic machinery is generally a constant torque load, at low speed start, there must be a certain torque, in order to make the machine start smoothly.
3, stable performance, reliable work In order to ensure the quality of plastic products, the work of the drag system must be very stable.
The following is a brief introduction to the inverter control system of the film blowing machine:
The blown film machine frequency conversion speed control drive system consists of two parts: one is the frequency converter that squeezes the main motor, and the other is the frequency converter of the traction motor. Their control is very simple, the speed of the motor can pass the keyboard of the panel. Or externally set the potentiometer to adjust. The function presets of the inverter are mainly as follows:
1. The frequency reference can be given by keyboard or external potentiometer.
2. The upper and lower frequency upper limit frequencies should generally be slightly higher than the rated frequency, and the lower limit frequency is usually set to 3 Hz.
3. The jog frequency can be preset to 8Hz.
4. Ascending and decelerating time Since plastic machinery does not need to be frequently started and braked, there is no strict requirement for the speed of lifting. The basic principle is not to exceed the rated current, but the sealing and cutting machine should be preset as short as possible.
5, torque compensation Because plastic machinery has low requirements on the hardness and dynamic response of mechanical properties, V / F control can be used.
6. Preset of DC braking function The general plastic machinery does not need to preset the DC braking function, but for the sealing and cutting machine, in order to reduce the deceleration time, the preset DC braking is suitable.
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