Hydraulic control unit, servo control mold locking hydraulic system and injection molding machine

By integrating a high-frequency response servo valve and a closed-loop sensor into the hydraulic control unit, high precision, simplified structure, and high energy efficiency of the injection molding machine's clamping system are achieved. This solves the shortcomings of traditional hydraulic injection molding machines in mold plate micro-opening control, and improves product quality and equipment reliability.

CN121535944AActive Publication Date: 2026-02-17NINGBO L K MASCH CO LTD
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Patent Information

Application Number
CN202511965569.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-24
Publication Date
2026-02-17
Estimated Expiration
2045-12-24

AI Technical Summary

Technical Problem

Traditional hydraulic injection molding machines have shortcomings in terms of high precision and high energy efficiency, making it difficult to achieve micro-opening of the mold plate. Furthermore, their control logic is complex, with a large number of components and high maintenance costs, which cannot meet the needs of high-end injection molding equipment.

Method used

A hydraulic control unit is constructed by using a high-frequency response servo valve, a one-way lifting valve, a two-way lifting valve, and a closed-loop sensor controller to achieve sub-millimeter-level micro-motion displacement control of the piston rod of the mold-locking cylinder. Four sets of hydraulic control units are connected in parallel to support synchronous drive and independent control of multiple cylinders, simplifying the oil circuit structure.

Benefits of technology

It improves the position repeatability and dynamic response speed of micro-opening action, reduces the number of hydraulic components, reduces maintenance difficulty, improves molding quality and energy efficiency, and meets the process requirements of high-end injection molding equipment.

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Abstract

The invention belongs to the technical field of injection molding machine hydraulic control systems, and provides a hydraulic control unit, a servo control mold locking hydraulic system and an injection molding machine, the control unit comprises a high-frequency response servo valve, a one-way poppet valve, a two-way poppet valve and a controller; one end of the two-way poppet valve is connected with a rod cavity of the mold locking oil cylinder, and the other end is connected with the system oil tank; the controller is electrically connected with the high-frequency response servo valve and is in signal connection with the pressure sensor and the displacement sensor. Compared with the prior art, the high-precision hydraulic control unit is constructed by integrating the high-frequency response servo valve, the one-way poppet valve, the two-way poppet valve and the closed-loop sensing controller, so that the position repetition precision and the dynamic response speed of micro-opening action are remarkably improved; the requirements of advanced technologies such as foaming injection molding and thin-wall forming on dynamic adjustment of the pressure of the cavity are effectively met, and the problems of uneven density, flash or mold damage of products are avoided.
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