What kind of frequency converter is better for injection moulding machine
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Author:lytrannet
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Published time: 2019-06-02
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Injection moulding machine is the main equipment for moulding and processing of various injection moulding machine materials (e.g. polyethylene, polypropylene, etc.). The working process of injection moulding machine is generally divided into several stages, such as closing, locking, spraying, melting, holding, cooling and opening. The working pressure and flow required in each stage are different. As far as oil pump motor is concerned, the whole injection moulding process is in a changing load state from time to time.
Injection moulding machine is the main equipment for moulding and processing of various injection moulding machine materials (e.g. polyethylene, polypropylene, etc.). The working process of injection moulding machine is generally divided into several stages, such as closing, locking, spraying, melting, holding, cooling and opening. The working pressure and flow required in each stage are different. As far as oil pump motor is concerned, the whole injection moulding process is in a changing load state from time to time. Most of the front injection moulding machines are quantitative pumps, whose oil pump motors output constant flow with constant bending speed. In some stages of consumption, only very little flow and pressure are needed. The excess hydraulic oil flows back to the tank through the relief valve. In the injection moulding machine industry, the process of high-pressure throttling. According to the past theoretical experience, the processed parts do not all work under the maximum pressure and flow rate, so there is surplus. In the past, the output power was usually based on pressure, so the energy consumption is considerable.
In view of the energy consumption phenomenon of high pressure throttling, some injection machine manufacturers have developed variable displacement pump injection machine. It is assumed that changing the quantitative pump of injection machine to variable displacement pump is not only the largest project, but also has a high investment cost. Therefore, it is not theoretical to transform the quantitative pump of injection machine into variable displacement pump. Nowadays, more and more injection moulding machines begin to use frequency converter equipment, which not only solves many defects of injection moulding machines, but also has other advantages.
As follows:
1. Soft startup: Star triangle step-down delayed startup is adopted for motor in power frequency condition. At this time, the current is 4-7 times the rated current of the motor. If multiple high-power motors start at the same time, it will have a great impact on the power grid. Using frequency conversion motor can start soft only at rated current, the current is smooth and no impact, which greatly reduces the impact of starting current on motor and power grid, and prolongs the service life of motor.
2. Avoiding personal safety accidents: After installing frequency converter in injection moulding machine, because the speed analog of the computer of the plastic machine has no output when the operator takes parts from the mould, cleans and repairs the mould, the motor is in a stop state, and the hydraulic system has no pressure, which avoids the wrong action of the machine and completely eradicates the occurrence of personal safety accidents of the injection moulding machine.
3. Reducing reactive power: Reactive power not only increases line losses and equipment heating, but also mainly results from the reduction of active power caused by the reduction of power factors. After using the energy-saving control device of frequency conversion speed regulation, the power factor is close to 1 due to the function of filter capacitor in the frequency converter, which increases the active power of the power grid and consequently saves the energy consumed by reactive power.
4. Energy-saving: Three sets of asynchronous AC motors commonly used in injection moulding machines can't change speed, and the flow rate of output hydraulic oil can't be changed when the quantitative vane pump is driven by them. When the injection moulding machine stops low-speed operation, excess flow flows back to the fuel tank through the relief valve, which constitutes a great loss of energy. The frequency converter can adjust the speed of the motor according to the command of the control system, so that the flow rate of the hydraulic oil output from the vane pump can be changed according to the speed of the injection moulding machine, which reduces the energy consumption of the hydraulic oil flowing back to the tank from the relief valve, and consequently saves a lot of electric energy. According to the theoretical experience of many times modification of injection moulding products by Taiwanese worker Edley, the power consumption and energy saving rate of the motor is about 20-70%. It is imperative to reform the frequency converter of injection moulding machine.
The Edley Inverter has a powerful control platform and completes the complex motor control algorithm efficiently. With leading control algorithms to achieve good motor control effect, powerful functions to enhance energy efficiency and easy operation, convenient for customers to use. Taigong Edley Frequency Converter is widely used in all walks of life depending on high quality products. It is widely used in electronics, textile, light industry, building materials, food, machinery, printing and dyeing, petrochemical, papermaking, machine tools, mixers, extruders, injection moulding machines, water conservancy, constant pressure water supply, steel industry, chemical industry, mines, boiler fans, etc. With advanced vector control technology, rigorous quality management system and perfect after-sales service system, Taigong Edley is the leader in domestic frequency converter industry.
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