Inner-Circulating Hydraulic System for Stamping Dwell Time Control
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Solution Overview
Problem
Conventional hydraulic systems in stamping processes face challenges in maintaining consistent dwell time, achieving high speed, high pressure, and high precision due to complex structures and high maintenance costs, leading to quality issues in prints.
Innovation Solution
An inner-circulating high speed hydraulic system combining servo motor technology with inner-circulating pressing technology, featuring a hydraulic cylinder assembly and pressure valve assembly, which eliminates the need for hydraulic pumps, servo valves, and lines, allowing for precise control of dwell time and high-speed operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional hydraulic servo systems are used, then hydraulic actions can be achieved, but the structure becomes complicated with numerous components causing high maintenance cost and low efficiency
Solution Approach 1:
The patent extracts and eliminates unnecessary components from the conventional hydraulic system. Specifically, it removes the hydraulic pump, servo valve, energy storage system, and complex line connections, retaining only the essential hydraulic cylinder and control elements. This extraction principle directly resolves the contradiction by maintaining hydraulic functionality while dramatically simplifying the system structure and reducing maintenance requirements.
Solution Approach 2:
The patent merges multiple functions into a single integrated hydraulic cylinder assembly. The cylinder incorporates both the actuating mechanism and the control elements within one unified structure, eliminating the need for separate components like servo valves and energy storage systems. This merging approach maintains system reliability while reducing structural complexity and component count.
2Power
If conventional hydraulic systems are used, then hydraulic actions can be performed, but the system produces loud noise and low efficiency
Solution Approach 1:
The patent eliminates the hydraulic pump and servo valve, which are the primary sources of noise and energy loss in conventional systems. By removing these components and replacing them with a direct motor-driven cylinder system, the invention significantly reduces noise levels and improves energy efficiency while maintaining full hydraulic power delivery capability.
3Speed
If mechanical moving-platform with crank shaft and swing-rod transmission is used, then platform movement can be achieved, but the dwell time varies with changing speeds making it difficult to guarantee print quality
Solution Approach 1:
The patent replaces the mechanical crank shaft and swing-rod transmission system with a direct hydraulic actuation system. This substitution eliminates the inherent mechanical limitations that cause dwell time variation with speed changes. The hydraulic system provides direct, controllable motion with consistent dwell time regardless of operating speed, thereby ensuring uniform print quality while maintaining high-speed capability.
4Speed
If current hydraulic systems are designed for high speed, then speed can be increased, but it becomes difficult to achieve high pressure and high precision at the same time
Solution Approach 1:
The patent removes the servo valve and energy storage system that typically create bottlenecks in conventional hydraulic systems. This extraction allows the system to achieve high speed response directly through motor-driven cylinder action, while the simplified structure enables better control over positioning precision and pressure stability without the interference of complex control components.
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
The system achieves high efficiency, precision, and reduced maintenance costs, enabling high-quality stamping processes with positional repeatability of ±0.01 mm and a speed of 8000 sheets/hour, while maintaining a compact structure for easy transportation.
Implementation Method 1
a plunger (15) reciprocating in a high pressure cylinder (11)
Implementation Method 2
the inner-circulating oil chamber (22) can communicate with the axial hole (112) via the at least one radial hole (12) and in turn can communicate with a chamber (113) on the top of the hydraulic plunger (15)
Implementation Method 3
a compressed air inlet (7) disposed on an upper portion of the housing (6)
Data Source
AI summary
An inner-circulating high speed hydraulic system, a hydraulic platform and a hydraulic platform assembly consisting of said systems, wherein the inner-circulating high speed hydraulic system comprises a hydraulic cylinder component and a pressure valve component, the hydraulic cylinder component including a high pressure cylinder, a hydraulic plunger, and a housing, wherein an axial hole and radial holes intersecting with the axial hole are disposed at the top/bottom of the high pressure cylinder and the high pressure cylinder is contained within the housing, wherein the inner-circulating oil chamber may communicate with the axial hole via the radial holes and further communicate with chambers at the top/bottom of the hydraulic plunger, wherein compressed air inlets are disposed on the housing and a lower end of the hydraulic plunger is connected to an actuating element; and a pressure valve component, comprising a pressure servo motor and a pressure plunger driven by the pressure servo motor to move up and down within the axial hole disposed at the top/bottom of the high pressure cylinder. Accurate control on dwell time for pressing at the up and down stop points of the platform, and highly precise adjustment to duration of the dwell time are enabled by the present invention. Thus, a stamping process with high quality is achieved.