Hydraulic Pump Dual-Piston Control for Flow and Pressure Switching
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Solution Overview
Problem
Existing hydraulic tools face inefficiencies in controlling fluid pressure and flow to optimize operations such as cutting, crimping, and lifting, lacking effective methods to determine the end of these operations and adjust fluid flow accordingly.
Innovation Solution
A hydraulic pump system with a high-flow piston and high-pressure piston, an unloading valve, and a control mechanism to selectively couple flow paths based on threshold pressures, allowing for precise control of fluid flow and pressure to the hydraulic tool, including modes of operation set by user input and remote control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single hydraulic pump is used to supply fluid to the hydraulic tool, then the device complexity is reduced, but the ability to optimize both flow rate and pressure independently is limited
Solution Approach 1:
The hydraulic pump system is segmented into two independent pumping mechanisms: a high-flow piston for rapid fluid delivery and a high-pressure piston for pressure generation. This segmentation allows each component to specialize in one function, optimizing overall system performance while maintaining independent control over flow rate and pressure parameters.
Solution Approach 2:
The dual-piston system provides multi-functionality by capable of operating in different modes: high-flow mode for rapid positioning, high-pressure mode for work execution, and combined mode for optimized performance. The system can adapt to different operational requirements without requiring separate dedicated systems.
2Productivity
If fluid flow is continuously supplied to the hydraulic tool, then the productivity is maintained, but the energy consumption increases and operational precision decreases
Solution Approach 1:
The hydraulic system employs periodic action through alternating operation of the high-flow piston and high-pressure piston. The high-flow piston operates in rapid cycles to supply fluid during positioning phases, while the high-pressure piston operates in slower cycles during work execution phases. This periodic operation allows the system to match energy output to actual operational needs, reducing wasted energy during low-demand periods.
Solution Approach 2:
The system dynamically adjusts between high-flow and high-pressure modes based on real-time operational requirements. The control mechanism monitors tool position and work stage to automatically transition between pumping modes, ensuring energy is supplied at the appropriate intensity only when needed, rather than maintaining continuous high-energy output.
3Reliability
If high pressure is applied continuously to ensure work completion, then the reliability of work operation is improved, but the risk of uncontrolled operation increases
Solution Approach 1:
The hydraulic system incorporates feedback mechanisms that monitor fluid pressure, flow rate, and tool position in real-time. This feedback information is used by the control mechanism to continuously adjust the operation of the high-flow and high-pressure pistons, ensuring that high pressure is applied only when and where needed for work completion, while automatically reducing or stopping pressure when the work is complete or when safety thresholds are approached.
Solution Approach 2:
The control mechanism acts as an intermediary between the dual-piston system and the hydraulic tool. It receives input from sensors monitoring tool status and work progress, then intelligently controls the sequencing and intensity of fluid delivery from both pistons. This intermediary layer prevents direct uncontrolled pressure application by mediating between the power source and the tool, ensuring reliable work execution while maintaining safety through automated pressure management.
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
Enables efficient and safe operation of hydraulic tools by optimizing fluid pressure and flow, ensuring precise control over cutting, crimping, and lifting operations, enhancing operational efficiency and safety by determining the end of these tasks based on pressure thresholds.
Implementation Method 1
operating a high-flow piston to supply fluid from a tank to a work port via a first flow path... operating a high-pressure piston to supply fluid from the tank to the work port via a second flow path
Implementation Method 2
actuating an unloading valve to selectively couple the first flow path and the second flow path based on a first threshold pressure
Data Source
AI summary
A method of operating a hydraulic pump to provide fluid to a hydraulic tool for performing a work operation on a workpiece includes operating a high-flow piston to supply fluid from a tank to a work port via a first flow path and operating a high-pressure piston to supply fluid from the tank to the work port via a second flow path. An unloading valve is actuated to selectively couple the first flow path and the second flow path based on a first threshold pressure. An end of the work operation is determined based on a second threshold pressure.