Hydraulic drive unit for high-speed continuous hollow blow molding machine

Abstract

The invention discloses a hydraulic drive unit for a high-speed continuous hollow blow molding machine, which is capable of reducing the energy consumption and the impact force under the condition of mold movement and improving the mold moving speed and the production efficiency. The hydraulic drive unit comprises a main oil pump, an auxiliary oil pump and a drive motor thereof, wherein an oil outlet of the main oil pump is connected with a main non-return valve through a changeover valve; oil inlets of the main non-return valve and a proportional pressure-reducing valve are connected with a main hydraulic fluid accumulator; an oil outlet of the proportional pressure-reducing valve is an oil supply port of a main hydraulic oil channel; the oil supply port of the main hydraulic oil channel is connected with a mold moving oil cylinder through a closed-loop electrohydraulic proportional changeover valve; an oil outlet of the auxiliary oil pump is an oil supply port of an auxiliary hydraulic oil channel; and the oil supply port of the auxiliary hydraulic oil channel is also connected with an auxiliary hydraulic fluid accumulator through oil inlets of an auxiliary non-return valve and a servo valve. The hydraulic drive unit is particular suitable to be used in the multi-station high-speed continuous hollow blow molding machine.

Description

technical field [0001] The invention relates to a hydraulic driving device in a hollow blow molding machine, in particular to a hydraulic driving device in a high-speed continuous hollow blow molding machine. Background technique [0002] The actions of the high-speed continuous hollow blow molding machine usually include: opening and closing of the mold, moving the mold, advancing and retreating the blowing device, lifting the mold head, removing flash, etc. Its characteristics are: the time of each cycle is short, and there are many actions (especially the double-station high-speed continuous hollow blow molding machine); and the flow required for each action is very different, and the movement of the mold and the opening and closing of the mold are required. The flow rate is very large, but the flow rate required for lifting the die head, advancing and retreating of the blowing device, and removing flash is very small. In each cycle, the action time accounts for a high p...

AI Technical Summary

Problems solved by technology

[0004] 1. Large energy consumption: The displacement of the oil pump and the corresponding motor must be selected according to the peak flow rate, resulting in a large amount of overflow loss when the flow rate is small

[0005] 2. The execution speed of the action is slow and the impact is large: because the mold moving action is controlled by an electromagnetic reversing valve and a throttle valve, it is impossible to achieve precise hydraulic positioning and a mechanical limit is used. The impact of starting and stopping is very large. In order to reduce the impact just slow down

This causes a waste of time and reduces production efficiency.

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