A hydraulic system for associated safety control of front and rear doors of injection molding machine

Abstract

The invention relates to a mechanism related to hydraulic pressure safety in the field of injection molding machines, which is designed according to a requirement that a front door or a back door is opened independently or the front door and the back door are opened simultaneously to trigger to stop mold opening and closing actions of the injection molding machine. A specific control element is connected between a mechanical direction valve related to the front door and the rear door and a cartridge valve having a confirmation detection function according to certain specific serial-connecting and parallel-connecting requirements. The mold opening and closing actions of a mold opening and closing oil cylinder of an injection molding machine can be timely triggered, monitored and stopped under conditions that the front door or the back door is opened or the two safety doors are both opened, and the safety control requirement is achieved. Compared with the existing control systems, the hydraulic system for the relevant safety control of front and back doors of the injection molding machine can be installed conveniently, can be maintained simply, can timely and effectively stop the mold opening and closing actions and feed back a monitoring signal, and has high safety performance; after the hydraulic system is applied to national and regional injection molding machines with high safety requirement, the safety of the equipment is improved and the customer requirements are met effectively.

Description

technical field

[0001] The invention is suitable for injection molding equipment whose mold clamping unit works with hydraulic oil as the medium. The invention relates to a hydraulic circuit safety control system for opening and closing molds of an injection molding machine, in particular to a hydraulic circuit that can be used for the safety control of a mold clamping unit of an injection molding machine that meets Brazilian NR12 requirements. Background technique

[0002] The hydraulic safety mechanism of injection molding machine can greatly improve the safety of the equipment itself. The hydraulic safety circuit applied on the injection molding machine usually meets the safety requirements by cutting off the control oil of the main valve that pushes the electro-hydraulic directional valve to open and close the mold. However, in the actual production process, due to various reasons such as valve jams and low oil cleanliness, frequent safety insurance failures in the contr...

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