Plastic machinery has become a vital part of the broader machinery industry due to its extensive use in both industrial and agricultural production. By integrating variable frequency drive (VFD) technology, plastic machines can significantly reduce energy consumption—saving approximately 20-60% of electricity. This not only minimizes the load on the power grid but also promotes green energy usage, leading to better product quality and higher output efficiency.
There are numerous types of plastic machinery available, such as calenders, film blowing machines, sealing and cutting machines for plastic bags, injection molding machines, trunking machines, gusset machines, pipe extruders, film extruders, molding machines, coating compound machines, wire drawing machines, kneaders, plastic blowers, and auxiliary equipment like air blowers, liquid feeders, mixers, and agitators. Except for specialized models like the four-roll calender that require high synchronization precision, most of these machines are widely used in manufacturing. Their drive systems typically have similar performance requirements.
Key features of plastic machinery include:
1. **Speed Adjustment**: The system should allow smooth speed control within a certain range to produce different product types.
2. **Stable Start and Brake**: Since plastic machines usually operate under constant torque, they need sufficient starting torque to ensure smooth operation at low speeds.
3. **Reliable Performance**: Stability is crucial to maintain consistent product quality, which requires the drive system to function reliably under various conditions.
Let’s take the inverter control system of a blown film machine as an example. The frequency conversion speed control system consists of two main parts: one for the main motor and another for the traction motor. The control process is straightforward, allowing speed adjustment via the panel's keyboard or an external potentiometer. The inverter is pre-set with several key functions:
1. **Frequency Reference**: Can be set through the panel or an external potentiometer.
2. **Upper and Lower Frequency Limits**: The upper limit is generally slightly above the rated frequency, while the lower limit is usually set around 3Hz.
3. **Jog Frequency**: Typically preset to 8Hz for quick adjustments.
4. **Acceleration and Deceleration Time**: Although frequent start-stop is uncommon in most plastic machinery, the acceleration time should not exceed the rated current. For sealing and cutting machines, shorter deceleration times are preferred.
5. **Torque Compensation**: Since mechanical rigidity and dynamic response are not critical in plastic machinery, V/F control mode is commonly used.
6. **DC Braking Function**: Most plastic machines don’t require DC braking, but it’s beneficial for sealing and cutting machines to reduce deceleration time and improve efficiency.
By using advanced inverter technology, plastic machinery can achieve greater energy savings, operational stability, and flexibility in production. This makes it an essential component in modern manufacturing environments.
Granules For Co-extrusion WPC Product
Black Hdpe Particles,Sustainable Hdpe Pellet,Hdpe Pellet,Recycled Particles
Huaian Yige New Material Co., Ltd. , http://www.cnygplastic.com