Quick mould opening/closing control structure and control method of toggle type injection molding machine

Abstract

The invention relates to a quick mould opening / closing control structure and a control method of a toggle type injection molding machine comprising an oil supply oil tank, a mould opening / closing hydraulic cylinder, a main oil pipeline, an oil return pipeline, a servo hydraulic driving device, a directional control valve and a proportional flow valve with feedback. By the device, the servo hydraulic driving device is utilized to provide pressure oil required by mould opening / closing, the pressure oil enters a mould opening / closing oil cylinder, then the set value of the mould opening / closing pressure is reasonably increased by utilizing the performance of the servo hydraulic driving device, and the speed tracing pressure of the pressure oil keeps high-speed running with large flow rate inthe mould opening / closing process; the proportional flow valve with the feedback is reasonably regulated at a mould closing stop stage and a mould opening termination stage to control the magnitude of the oil return quantity, oil return resistance is provided to prohibit the movement of a movable template, the rigid impact of the template to a machine in the high-speed running process is reduced,the mould opening / closing running is stable, and the accuracy of a stop position is high; and the quick mould opening / closing control structure and the method realize the advantages of high speed, high accuracy, high efficiency, low energy consumption and the like.

Description

technical field [0001] The present invention relates to an application of using a servo hydraulic drive device and related oil circuits to control the mold opening and closing of an injection molding machine, especially a rapid mold opening and closing control structure for high-speed precision mold opening and closing of an injection molding machine using a toggle-type clamping structure. Control Method. Background technique [0002] The traditional mold opening and closing technology of toggle-type mold clamping structure injection molding machine is that an ordinary motor drives a hydraulic pump (quantitative pump or variable pump) to output pressure and flow, and the direction of the pressure oil is switched through the directional control valve to open and close the mold. During this process, the pressure and flow of the pressure oil are constantly adjusted according to the change of the mold opening and closing parameters, and the excess pressure and flow will usually ...

AI Technical Summary

Problems solved by technology

During this process, the pressure and flow of the pressure oil are constantly adjusted according to the change of the mold opening and closing parameters, and the excess pressure and flow will usually flow off through the relief valve, which inevitably causes energy loss; at the same time, due to the rapid opening and closing of the mold During the movement, the hydraulic oil and the high-speed movement of the template have a large rigid impact, and the mold opening stop position often has a certain deviation, and the precision of mold opening and closing cannot be guaranteed. Many injection molding machines that use manipulators usually need to add mechanical mold opening positioning to ensure opening. Die accuracy increases the cost of use virtually, and the increase in energy consumption and cost of use of the whole machine is not compatible with the concept of energy saving and consumption reduction advocated by the country.

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