Plastic granulator is a kind of molding machine that can make strip materials into specific shapes, and it is a combined product used with single-screw and twin-screw extruder production lines. It is mainly used for glass fiber reinforcement and cold drawing granulation of polyolefin, engineering plastics and PP, PBT, PET and other plastics. It is widely used in chemical, petrochemical, pharmaceutical, food, building materials, mining and metallurgy, environmental protection, printing and dyeing, ceramics, rubber, plastics and other fields.

The system of the granulator has strict requirements on sequence control, and needs to detect and control various parameters, such as flow, temperature, speed, position, etc., and also needs to precisely control some of these parameters, such as the speed of the granulator motor. Its early system adopts relay control, which has low precision and slow response. With the rapid development of industrial automation, the emergence of frequency conversion speed regulation system perfectly solves the above problems and becomes one of the best solutions for the pelletizer control system.

vfd in plastic pelletizing machine

Frequency converters have been used maturely in the granulator industry for many years. The frequency converter has been successfully applied in the granulator equipment with its high performance and high cost performance advantages, and its stable and reliable operation has won unanimous praise from customers. Next, let’s introduce the application of frequency converter in a large granulator equipment factory.

The plastic granulator is mainly composed of traction mechanism, knife chamber, transmission mechanism, power system, control system, and discharge box. The principle of the granulator is to pressurize the molten polyethylene plastic through the plastic extruder, filter out the possible impurities through the screen changer, and then flow into the multiple flow channels of the template through the screen. It becomes smaller and accelerates to flow to the discharge end, and finally enters the cooling water tank in a strip state through the die hole to cool and shape, and finally is bitten by the traction roller of the pelletizer, and is sent into the knife chamber of the pelletizer synchronously, and the high-speed rotating cutter will The plastic strands are cut into small particles to complete the whole granulation process.

The frequency converter mainly receives the frequency given signal from the upper computer to adjust the speed of the pelletizing knife motor, and the motor drives the knife head to rotate at high speed through the belt to cut the material to meet different process requirements.

Application advantage

1. The appearance and color matching of the inverter are exquisite and beautiful, and the appearance is integrated with the control cabinet, giving people a refreshing feeling and improving the comfort of customers.

2. The inverter is equipped with high-performance vector control, 150% torque output at low frequency, and the speed control accuracy can reach ±0.5%, which makes the system respond quickly and start and stop smoothly, which meets the customer’s smooth frequency switching under different material requirements, greatly Improved production efficiency and product quality.

3. After the equipment adopts the frequency converter, the system debugging is convenient and fast, the cutting speed can be adjusted according to the raw material working conditions, and the maintenance cost and energy consumption are reduced.

4. The frequency converter can provide complete over-current, over-voltage, under-voltage, overload and other protection functions. It can protect against material jams and other situations in time, making the system run more stable and reliable, and has won the trust of users.

Plastic granulator is a kind of molding machine that can make strip materials into specific shapes, and it is a combined product used with single-screw and twin-screw extruder production lines. It is mainly used for glass fiber reinforcement and cold drawing granulation of polyolefin, engineering plastics and PP, PBT, PET and other plastics. It is widely used in chemical, petrochemical, pharmaceutical, food, building materials, mining and metallurgy, environmental protection, printing and dyeing, ceramics, rubber, plastics and other fields.

The system of the granulator has strict requirements on sequence control, and needs to detect and control various parameters, such as flow, temperature, speed, position, etc., and also needs to precisely control some of these parameters, such as the speed of the granulator motor. Its early system adopts relay control, which has low precision and slow response. With the rapid development of industrial automation, the emergence of frequency conversion speed regulation system perfectly solves the above problems and becomes one of the best solutions for the pelletizer control system.

vfd in plastic pelletizing machine

Frequency converters have been used maturely in the granulator industry for many years. The frequency converter has been successfully applied in the granulator equipment with its high performance and high cost performance advantages, and its stable and reliable operation has won unanimous praise from customers. Next, let’s introduce the application of frequency converter in a large granulator equipment factory.

The plastic granulator is mainly composed of traction mechanism, knife chamber, transmission mechanism, power system, control system, and discharge box. The principle of the granulator is to pressurize the molten polyethylene plastic through the plastic extruder, filter out the possible impurities through the screen changer, and then flow into the multiple flow channels of the template through the screen. It becomes smaller and accelerates to flow to the discharge end, and finally enters the cooling water tank in a strip state through the die hole to cool and shape, and finally is bitten by the traction roller of the pelletizer, and is sent into the knife chamber of the pelletizer synchronously, and the high-speed rotating cutter will The plastic strands are cut into small particles to complete the whole granulation process.

The frequency converter mainly receives the frequency given signal from the upper computer to adjust the speed of the pelletizing knife motor, and the motor drives the knife head to rotate at high speed through the belt to cut the material to meet different process requirements.

Application advantage

1. The appearance and color matching of the inverter are exquisite and beautiful, and the appearance is integrated with the control cabinet, giving people a refreshing feeling and improving the comfort of customers.

2. The inverter is equipped with high-performance vector control, 150% torque output at low frequency, and the speed control accuracy can reach ±0.5%, which makes the system respond quickly and start and stop smoothly, which meets the customer’s smooth frequency switching under different material requirements, greatly Improved production efficiency and product quality.

3. After the equipment adopts the frequency converter, the system debugging is convenient and fast, the cutting speed can be adjusted according to the raw material working conditions, and the maintenance cost and energy consumption are reduced.

4. The frequency converter can provide complete over-current, over-voltage, under-voltage, overload and other protection functions. It can protect against material jams and other situations in time, making the system run more stable and reliable, and has won the trust of users.

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