In the case of constant speed, by changing the displacement of the hydraulic pump, the motor load will also change with the displacement, achieving the purpose of saving power. 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 varies with the load, while the output power of the fixed displacement pump is relatively constant. In the case of small flow operation, the output power of the variable displacement pump is very low. , And the output power of the quantitative pump is basically constant. 1. Equipped with a high-response power matching ratio variable displacement pump system to match the output of the hydraulic system of the injection machine with the power required for the whole machine operation, without energy loss of the high-pressure throttling overflow, especially in the energy-saving effect of the rubber injection process, the melting glue, and the cooling process. High, average up to 30-50% energy-saving effect. For the thick or large products with long shot-adhesion time, the advantages of energy-saving are more obvious. At the same time, the same motor power can be equipped with a larger displacement pump to speed up the entire machine.
2. The variable pump injection machine is generally used for small machines. For medium and large injection machines, the use of variable pumps increases the cost of the equipment too much, making it uneconomical. Medium and large-sized injection machines generally use multiple quantitative pumps to work together to achieve the purpose of changing the operating speed. Energy consumption can also be reasonably controlled through pump loading, unloading, and matching.
3. In addition, the variable pump requires a high degree of cleanliness of the oil, which increases the use cost of the variable displacement pump injection machine and further limits its application. Variable-volume pump injection machines and servo-controlled energy-saving injection machines have a relatively long development time, and their technological development is also relatively mature.
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