Multi-functional Valve Unit for Molding Machine Hydraulic Circuit
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Solution Overview
Problem
Conventional molding machines are large and complex due to separate arrangements of flow adjustment, pressure adjustment, and path control valves in their hydraulic circuits, leading to space inefficiency and increased size, and they suffer from decreased foam expansion ratios due to prolonged resin injection times allowing bubbles to grow and break.
Innovation Solution
Integration of flow adjustment, pressure adjustment, and path control valves into a multi-functional valve unit within the hydraulic circuit, along with a two-stage accumulator system to drive injection, mold closing, and pressure maintenance processes, allowing for efficient oil flow and pressure management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If flow adjustment valve, pressure adjustment valve, and path control valve are arranged separately in the hydraulic circuit, then each valve can be optimized for its specific function, but the hydraulic circuit becomes complicated and occupies large space
Solution Approach 1:
The patent combines the flow adjustment valve, pressure adjustment valve, and path control valve into a single integrated valve unit. This merging of previously separate components reduces the overall number of parts, simplifies the hydraulic circuit layout, and decreases the space required for the hydraulic system while maintaining all necessary functions.
Solution Approach 2:
The integrated valve unit is designed to perform multiple functions simultaneously - flow adjustment, pressure adjustment, and path control - within a single component structure. This multi-functional design eliminates the need for separate dedicated valves for each function, thereby reducing system complexity and spatial requirements.
2Manufacturing precision
If injection time is extended to ensure complete resin injection, then injection thoroughness is improved, but bubbles grow excessively and break, decreasing foam expansion ratio
Solution Approach 1:
The integrated valve unit enables dynamic adjustment of flow rate and pressure during the injection process. By continuously optimizing these parameters, the system achieves rapid resin injection that completes the filling process quickly while maintaining control over the injection characteristics, thus preventing excessive bubble growth and breakage.
Solution Approach 2:
The system utilizes real-time parameter changes in flow rate and pressure through the integrated valve unit to optimize injection speed and completeness. By adjusting these parameters dynamically, the injection process achieves thorough resin placement without extending the injection duration, thereby preserving foam bubble integrity and expansion ratio.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration reduces the overall size of the molding machine by simplifying the hydraulic circuit and enhances the foam expansion ratio by enabling faster injection and mold closing processes, preventing bubble breakage and maintaining pressure effectively.
Implementation Method 1
hydraulic pressure is used as power in a resin injection step, a step of opening and closing the split molds, and a pressure maintenance step
Data Source
AI summary
A molding machine configured to achieve space saving and simplification of the hydraulic circuit. Provided is a molding machine configured to form a molded body by closing, in a state where a parison is disposed by injecting molten resin between first and second molds capable of being opened and closed, the first and second molds and maintaining pressure applied to the first and second molds. A hydraulic circuit to conduct oil for generating hydraulic pressure; the flow adjustment valve, a pressure adjustment valve, and a path control valve included in the hydraulic circuit; and a multi-functional valve unit.