Plastic machinery has become an important industry in the machinery industry due to its wide application in industrial and agricultural production. Plastic machinery can save energy by applying variable frequency speed control technology (can save about 20-60% of electricity), reduce the impact on the power grid, achieve 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. In the above plastic machinery, except for the four-roll calender and the like, which require high synchronization precision, the others are extremely common production machines. The requirements for the drag system are basically the same.
1. It can smoothly adjust the speed within a certain range to produce different kinds of products.
2. The start and brake are stable. Plastic machinery is generally a constant torque load. At low speed start, there must be a certain torque to make the machine start smoothly.
3. Stable performance and reliable operation. To ensure the quality of plastic products, the work of the drag system must be very stable.
Take the inverter control system of the film blowing machine as an example to make a brief introduction:
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. Frequency reference: It can be given by keyboard or external potentiometer.
2. Upper and lower limit frequencies: The upper limit frequency should generally be slightly higher than the rated frequency, and the lower limit frequency is usually set to 3hz.
3, jog frequency: generally can be preset to 8hz.
4. Ascending and decelerating time: Since the 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: Since the plastic machinery has low requirements on the hardness and dynamic response of mechanical properties, the v/f control mode can be adopted.
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.
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. In the above plastic machinery, except for the four-roll calender and the like, which require high synchronization precision, the others are extremely common production machines. The requirements for the drag system are basically the same.
1. It can smoothly adjust the speed within a certain range to produce different kinds of products.
2. The start and brake are stable. Plastic machinery is generally a constant torque load. At low speed start, there must be a certain torque to make the machine start smoothly.
3. Stable performance and reliable operation. To ensure the quality of plastic products, the work of the drag system must be very stable.
Take the inverter control system of the film blowing machine as an example to make a brief introduction:
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. Frequency reference: It can be given by keyboard or external potentiometer.
2. Upper and lower limit frequencies: The upper limit frequency should generally be slightly higher than the rated frequency, and the lower limit frequency is usually set to 3hz.
3, jog frequency: generally can be preset to 8hz.
4. Ascending and decelerating time: Since the 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: Since the plastic machinery has low requirements on the hardness and dynamic response of mechanical properties, the v/f control mode can be adopted.
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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