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How effective is the use of frequency converters in plastic blow molding machines
Edit:Taizhou Huangyan Yige Machinery Co., Ltd.   UpDate:2019-10-23

Because plastic products are widely used in industrial and agricultural production, plastic bottle blowing machines have become an important industry in the machinery industry. After applying the frequency conversion speed regulation technology, the plastic bottle blowing machine can save electric energy (20 ~ 60% of power can be saved), reduce the impact on the power grid, realize green power consumption, and also improve product quality and output.

There are many types of blow molding machines, including plastic blow molding machines, hollow blow molding machines, automatic blow molding machines, hydraulic blow molding machines, large-scale storage-type blow molding machines, high-speed blow molding machines, and rotary blow molding machines. Among the above-mentioned plastic bottle blowing machines, such as a four-roll calender, which requires high synchronization accuracy, the others are extremely general production machinery. The requirements for the drag system are basically the same.

1. The smooth speed regulation within a certain range is mainly to facilitate the production of different types of products.

2. Starting and braking stability Plastic blow molding machines are generally constant torque loads. When starting at low speed, a certain torque is also required to make the machine start stably.

3. Stable function and 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 variable frequency control system of the film blowing machine:

Film blowing machine variable frequency speed control drag system includes two parts: one is the frequency converter governing the main motor, and the other is the frequency converter governor of the traction motor. Their control is very simple. Or externally given potentiometer to adjust. The function preset of the inverter mainly includes the following aspects:

1. The frequency setting can be set using the keyboard or an external potentiometer.

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

3. The jog frequency can be preset to 8Hz.

4. Rise and fall time Because the plastic bottle blowing machine does not need to be started and braked frequently, there is no strict requirement on the rise and fall speed. The basic principle is not to exceed the extra current, but the sealing and cutting machine should be preset as short as possible.

5. Torque compensation Because the plastic bottle blowing machine has low requirements for the hardness and dynamic response of the mechanical characteristics, V / F control method can be used.

6. Preset of DC braking function General plastic bottle blowing machines do not need to preset the DC braking function, but with regard to sealing and cutting machines, in order to reduce the deceleration time, the preset DC braking is suitable.