Combined Buffer Cylinder Valve for Stable Hydraulic Unloading
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Solution Overview
Problem
Existing hydraulic cylinder systems face issues with mechanical and hydraulic impacts due to large inertia, leading to system failures, and current buffer mechanisms result in unnecessary power consumption and energy waste, with unstable throttling control and pressure fluctuations affecting the buffering effect.
Innovation Solution
An unloading valve and combined valve type buffer cylinder system that includes a valve body, valve trim, and return spring, with specific oil passages and a damping hole, allowing for separate throttling and unloading functions to control pressure and reduce energy loss, featuring a modified buffer mechanism that replaces the signal chamber with a buffer chamber for improved stability and control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a buffer chamber is provided to reduce mechanical impact at the end of travel, then the mechanical impact is reduced, but the pressure in the oil inlet chamber increases causing energy waste and heat buildup
Solution Approach 1:
The invention divides the buffer valve into separate functional modules: a throttling module that controls oil return flow and an unloading module that separately controls oil inlet pressure relief. This segmentation allows independent optimization of each function, enabling the unloading module to relieve pressure in the oil inlet chamber while the throttling module manages the buffer chamber pressure, thereby reducing energy waste and heat buildup while maintaining mechanical impact resistance.
2Ease of operation
If a buffer valve with signal chamber is used to control throttling, then dynamic regulation is achieved, but pressure fluctuations cause valve trim instability and poor throttling control
Solution Approach 1:
The invention extracts and eliminates the problematic signal chamber from the buffer valve structure. Instead of using a small amount of signal oil that is sensitive to pressure fluctuations, the design directly controls the valve trim through the main oil passages. This extraction of the unstable signal chamber component removes the source of pressure-induced valve trim fluctuations, thereby maintaining dynamic throttling control capability while significantly improving valve trim stability.
Solution Approach 2:
The invention introduces a dedicated unloading orifice as an intermediary element between the oil inlet chamber and the buffer chamber. This unloading orifice acts as a mediator that smoothly regulates pressure transitions, preventing sudden pressure fluctuations from directly affecting the valve trim. The intermediary unloading orifice provides a controlled pressure relief path that stabilizes the system while maintaining dynamic control capability.
3Productivity
If the valve trim diameter is increased to improve flow capacity, then the main oil passage flow is improved, but the valve structure becomes larger and more complex
Solution Approach 1:
The invention transitions from a single-dimensional approach of increasing valve trim diameter to a multi-dimensional solution by adding the unloading orifice as a separate flow path. Instead of enlarging the valve trim in one dimension, the system creates an additional dimensional pathway for oil flow through the unloading orifice. This allows adequate flow capacity to be achieved through multiple smaller, simpler passages rather than one large complex valve trim, thereby maintaining productivity while reducing structural complexity.
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 effectively reduces pressure impacts, prevents energy waste, enhances buffering quality, and simplifies control, achieving better performance and reliability by directly controlling the valve trim with pressurized oil, reducing false operations and improving the overall stability and efficiency of the hydraulic system.
Implementation Method 1
a return spring provided in the spring chamber, comprising one end compressed to abut against the bottom of the spring chamber and the other end compressed to abut against one end of the valve trim
Implementation Method 2
The driving chamber and the spring chamber communicate through the damping hole
Implementation Method 3
An unloading groove is formed in the valve trim... an unloading groove communicated with the spring chamber
Data Source
AI summary
An unloading valve includes a valve body, a valve trim, a return spring, a damping hole, and an unloading groove. A combined valve includes the unloading valve and a throttling valve. The throttling valve includes a buffer stopper and a buffer chamber. A piston rod assembly of the combined valve type buffer cylinder is provided in a cylinder body. The cylinder body includes a cylinder head flange, a cylinder bottom, and a cylinder barrel. The piston rod assembly includes a guide sleeve, a piston, and a piston rod. The combined valve is provided on the cylinder. The system is located in an unloading state in a buffering process to reduce the energy loss and heat buildup of the system, prevent the pressure impact of buffering on the system, make the system more reliable, and lower the difficulty of the original buffer valve in performance matching, installation and debugging.