Hydraulic Sequence Valve for Dual-Speed Ram Alignment Control
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Solution Overview
Problem
Conventional hydraulic tools lack the ability to adjust the speed of the piston and work head selectively, leading to difficulties in aligning the work head at the desired crimp, cut, or punch location, and suffer from a lack of operational precision.
Innovation Solution
A hydraulic tool with a sequence valve that allows users to manually or electronically control the speed of the piston by selectively actuating fluid communication between chambers, enabling dual-speed operation based on user input.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional hydraulic tools operate at a single fixed speed, then the structure is simple, but the alignment precision and operational flexibility are poor
Solution Approach 1:
The sequence valve enables dynamic speed adjustment by allowing the piston to operate at different speeds based on pressure thresholds or manual actuation. The valve transitions between states to redirect hydraulic flow, changing the piston speed from fast approach to slow precise positioning, thereby achieving dynamic adaptability without requiring multiple fixed-speed systems.
Solution Approach 2:
The system changes the operational parameter of piston speed by utilizing pressure-dependent valve activation or manual triggers. When pressure reaches a threshold or the user activates the interface, the sequence valve redirects flow to alter the piston speed parameter, enabling the system to adapt speed based on operational phase requirements.
2Ease of operation
If the sequence valve is actuated automatically based on pressure, then the system is simpler to operate, but the user cannot manually control the timing of speed change
Solution Approach 1:
The sequence valve acts as an intermediary between the hydraulic pressure system and the user interface. It automatically responds to pressure thresholds while also accepting manual actuation signals. This intermediary mechanism allows the system to combine automatic pressure-based operation with manual override capability, giving users control over timing without requiring a completely manual system.
Solution Approach 2:
The sequence valve incorporates self-service functionality by automatically activating when pressure reaches a predetermined threshold, eliminating the need for continuous user intervention. The valve monitors pressure and triggers speed change autonomously, while still allowing manual actuation when needed, thus combining automatic operation with user control options.
3Manufacturing precision
If the pump supplies fluid to both chambers simultaneously, then the piston moves at a slower controlled speed, but the approach time increases
Solution Approach 1:
The hydraulic stroke is segmented into two distinct phases with different speed characteristics. The first phase supplies fluid to the first chamber for fast approach movement, while the second phase activates the sequence valve to supply fluid to the second chamber for slow controlled positioning. This segmentation allows each phase to be optimized for its specific operational requirement without compromising the other.
Solution Approach 2:
The system dynamically adjusts the fluid distribution between chambers based on operational needs. Initially, all fluid goes to the first chamber for rapid approach. When the sequence valve activates (via pressure or manual trigger), fluid distribution changes to include the second chamber, slowing the piston speed for precise positioning. This dynamic reallocation optimizes both approach speed and positioning precision.
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
Provides enhanced control over tool operation, allowing for precise alignment and increased productivity by enabling rapid approach and controlled, high-force operations, adapting to various workpiece materials and geometries.
Implementation Method 1
A sequence valve can be provided to switch the ram movement between the first speed and the second speed based on a pressure of hydraulic fluid
Implementation Method 2
A pump can supply fluid to the first chamber and the second chamber
Implementation Method 3
The sequence valve can include a poppet that moves based on the pressure in the first chamber or by actuation of the user interface
Data Source
AI summary
A power tool comprises a cylinder and a ram movably received in the cylinder to define a first chamber and a second chamber. A pump to supply fluid to the first chamber and the second chamber. A sequence valve is operable between a first configuration to cause the pump to supply fluid to the first chamber to move the ram at a first speed and a second configuration to cause the pump to supply fluid to the second chamber to move the ram at a second speed. A user interface is manually actuatable by a user to move the sequence valve between the first configuration and the second configuration independently of the pressure in the first chamber.