An energy-saving and pressure-maintaining device for a hydraulic injection molding machine

Abstract

The invention discloses an energy-saving and pressure maintaining device for a hydraulic injection molding machine. An energy storing device, namely an energy storer, is connected to an oil supplying oil circuit of a hydraulic system of the hydraulic injection molding machine in a parallel manner. Under the condition that the hydraulic injection molding machine is operated in a mode locking high-voltage stages, the energy storing device can absorb and store part of high-voltage energy. Under the condition that the hydraulic injection molding machine is operated in a pressure-maintaining stage, the energy storing device provides oil for the hydraulic injection molding machine in a reverse manner, an oil pump is unloaded in a zero-pressure manner, and the energy storing device provides dwell pressure for the hydraulic injection molding machine independently. According to the energy-saving and pressure maintaining device for the hydraulic injection molding machine, the device structure is simple, the cost is low, operating is reliable, the energy storing device provides the dwell pressure for the system independently, the energy-saving aim is accordingly achieved, and the service life of the oil pump is prolonged. The original function of the hydraulic system cannot be influenced by energy storing of the energy storer, the oil pump and a driving motor of an original system are not changed, and the energy utilization rate is improved.

Description

technical field [0001] The invention discloses a hydraulic control device for a hydraulic injection molding machine, in particular to an energy-saving and pressure-maintaining device for a hydraulic injection molding machine, which belongs to the technical field of energy-saving for hydraulic injection molding machines. Background technique [0002] Injection molding machines are the main production equipment in the plastic products industry, with a large market share and a large energy consumer. There are two types of injection molding machines in the market: all-electric drive and hydraulic drive. The all-electric injection molding machine has good energy-saving effect but is expensive. At present, the hydraulic drive type is more commonly used. The working cycle of an injection molding machine generally includes different working stages such as mold clamping, mold locking, injection, pressure holding, cooling, mold opening, and ejection. Each stage has different pressure ...

AI Technical Summary

Problems solved by technology

[0008] The disadvantages of this technology are: the structure of the variable displacement pump is complex, the price is expensive, and the inherent problems such as large internal leakage make the performance and price ratio not outstanding, and the actual field use is seldom

When the servo motor is driven, the gear pump is generally used to adapt to frequent and severe speed changes, but the internal radial force of the gear pump is unbalanced, and the service life is relatively short

[0013] 3. The market stock of injection molding machines that use the original ordinary motor to drive the quantitative pump is huge. If the servo motor drive technology is used for technical transformation, the motor and oil pump of the original injection molding machine need to be removed. Generally, the original motor and oil pump are scrapped, and the transformation workload is large

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