Hydraulic Power Tool Quick-Release Head and Rotary Pressure Control
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Solution Overview
Problem
Conventional hydraulic power tools lack efficient mechanisms for controlling pressure and releasing tool heads, leading to inaccuracies and reduced durability due to pressure overshoot and the need for external tools for head removal.
Innovation Solution
The development of a hydraulic power tool with a rotary return valve system for pressure control and a quick-release mechanism that allows tool head decoupling without external tools, enabling precise pressure management and easy tool head exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional hydraulic power tool is used without a rotary return valve system, then the tool can operate with simpler structure, but pressure control accuracy deteriorates leading to pressure overshoot and reduced durability
Solution Approach 1:
The rotary return valve acts as an intermediary component between the hydraulic cylinder and reservoir, mediating the pressure control function. The valve body with selectively alignable ports and the valve actuator with cam surface work together to precisely control fluid flow timing, eliminating pressure overshoot while maintaining reasonable structural complexity
Solution Approach 2:
The return valve system introduces dynamic control to the hydraulic system. The valve actuator rotates during pump operation to dynamically switch between open and closed positions, allowing the system to adapt pressure control in real-time based on operational needs, thereby improving pressure accuracy without excessive complexity
2Productivity
If a conventional tool head attachment method is used requiring external tools, then the structure can be simpler, but operational efficiency deteriorates due to time-consuming head removal and reinstallation
Solution Approach 1:
The quick-release mechanism enables the tool head to be removed and reinstalled without external tools through self-contained components. The resilient member and cam surface work together to allow the operator to easily actuate release, making the system serve itself for attachment/detachment operations, thereby improving both productivity and ease of operation
3Ease of operation
If a quick-release mechanism with resilient member and cam surface is used, then tool head exchange becomes easier and faster, but device complexity increases
Solution Approach 1:
The quick-release mechanism merges multiple functions into integrated components. The resilient member both provides locking force and enables release actuation, while the cam surface simultaneously controls valve operation and release mechanism actuation. This merging reduces the number of separate parts needed, improving ease of operation without excessive complexity increase
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 solution provides improved accuracy and durability by precisely controlling pressure and allowing tool head removal and reinstallation without external tools, enhancing operational efficiency and tool longevity.
Implementation Method 1
a pump for transferring hydraulic fluid in the reservoir to the cylinder, causing the piston to move from the retracted position toward the extended position
Implementation Method 2
a return valve defining a rotational axis and positioned between the cylinder and the reservoir, and a valve actuator driven by the pump for opening the return valve, thereby fluidly communicating the cylinder and the reservoir, in response to a predetermined pressure being reached in the cylinder
Data Source
AI summary
A hydraulic power tool includes a housing defining a cylinder, a piston at least partially positioned within the cylinder and movable between a retracted position and an extended position, a clevis supporting a head of the power tool, a nut coupled to an outer peripheral surface of the clevis, and a collar coupled to the housing and surrounding the nut to axially constrain the nut between the collar and the housing while permitting relative rotation between the collar and the nut.