In the case of constant speed, by changing the displacement of the hydraulic pump, while the motor load will change with the displacement, to achieve the purpose of saving electricity. The main difference between the variable displacement pump and the standard fixed displacement pump is that the output power is different. The output power of the variable displacement pump changes with the change of the load, while the output power of the fixed displacement pump is relatively constant. In the case of small flow rate operation, the output power of the variable displacement pump is very low , While the quantitative pump output power is basically constant. Equipped with high-response power matching proportional variable pump system to match the output power of the injection machine hydraulic system with the power required by the whole machine without energy loss caused by high-pressure throttling and overflowing, especially in the injection molding process, the energy-saving effect of the melting and cooling processes is higher, An average of up to 30-50% of the energy-saving effect. Long shot on the dough holding pressure or large products, the advantages of saving more pronounced. At the same time, the same motor power can be equipped with a larger displacement pump, so that the whole speed. Variable pump injection machine is generally used for minicomputers, in terms of medium and large injection machine, the use of variable pump on the equipment costs increase too much, very uneconomical. In large and medium-sized injection molding machines, multiple quantitative pumps are generally used to work together to achieve the purpose of changing the movement speed. Through the loading, unloading and matching of pumps, the energy consumption can also be controlled reasonably. In addition, variable-displacement pumps require a high degree of oil cleanliness, which increases the use cost of the variable-pump injectors and limits their application. Variable pump injection machine and servo control energy-saving injection molding machine, relatively speaking, the development time is longer, the technology development is more mature. However, so far, to our country enterprises, the variable pump and servo controller are still basically imported from developed countries, which is caused by the fact that China's basic machinery manufacturing industry is still relatively backward. Therefore, this has formed the reason why the market price of variable-pump energy-saving and servo-controlled energy-saving injection machine in our country still can not be attractive enough for the downstream product enterprises.
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