Due to the wide application of plastic products in industrial and agricultural production, plastic bottle blowing machine has become an important industry in the machinery industry. The application of frequency control technology in plastic bottle blowing machine can save electric energy (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 bottle blowing machines, including plastic bottle blowing machine, hollow bottle blowing machine, automatic bottle blowing machine, hydraulic bottle blowing machine, large storage bottle blowing machine, high-speed bottle blowing machine, rotary bottle blowing machine, etc. Among the above-mentioned plastic bottle blowing machines, except for the four roll calender which requires high synchronous precision, the rest are very common production machines. The requirements for the drag system are basically the same.

1. It is easy to produce different kinds of products.

2. Starting and braking are stable. Plastic bottle blowing machine is generally a constant torque load. When starting at low speed, there must be a certain torque to make the machine start smoothly.

3. In order to ensure the quality of plastic products, the driving system must be very stable.

Here is a brief introduction of the frequency conversion control system of the film blowing machine

The variable frequency drive system of film blowing machine consists of two parts: one is the variable frequency speed regulator of extrusion main motor, the other is the variable frequency speed regulator of traction motor. Their control is very simple. The speed of motor can be adjusted by keyboard on the panel or external potentiometer. The function preset of frequency converter mainly includes the following aspects:

1. Frequency can be given by keyboard or external potentiometer.

2. The upper and lower limit frequency, the upper limit frequency should be slightly higher than the rated frequency, and the lower limit frequency is usually set to 3Hz.

3. Generally, the inching frequency can be preset as 8Hz.

4. Because the plastic bottle blowing machine does not need to start and brake frequently, there is no strict requirement for the speed up and down. The basic principle is not to exceed the rated current, but for the sealing and cutting machine, it should be preset as short as possible.

5. The torque compensation can adopt V / F control mode because the plastic bottle blowing machine does not require high hardness and dynamic response of mechanical characteristics.

6. It is not necessary to preset the DC braking function for the general plastic bottle blowing machine, but for the sealing and cutting machine, in order to reduce the deceleration time, it is appropriate to preset the DC braking function.