Hydraulic Control Valve with Five Edges for Cylinder Tension
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Solution Overview
Problem
Existing hydraulic control valves with five control edges face challenges in adapting hydraulic tension during different phases of piston movement, particularly during rapid forward movement and subsequent holding phases, due to mismatched control edge sizes which affect fluid flow and pressure distribution.
Innovation Solution
The design introduces separate line paths for fluid flow during the work stroke, with a back-feed control edge and a pressure-release control edge of different sizes to manage fluid flow effectively, ensuring precise hydraulic tension across all work phases by branching the supply and discharge line into two strands and using a lock valve to control fluid release to the tank.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single control edge is used for both back feed and pressure release functions, then the device complexity is reduced, but the hydraulic tension control precision deteriorates due to uneven volume streams during different work phases
Solution Approach 1:
The control piston is segmented with five distinct control edges (32, 33, 34, 35, 36) instead of using a single control edge for multiple functions. Each control edge is responsible for specific fluid flow paths: control edges 32 and 33 handle back feed to the large stroke space, control edges 34 and 35 handle pressure release to the tank, and control edge 36 manages the small stroke space. This segmentation allows precise control of hydraulic tension during different work phases (rapid movement and holding phases) by matching control edge sizes to the corresponding volume streams.
2Productivity
If the control valve is designed for rapid piston movement with back feed, then the productivity is improved, but the adaptability to holding phase requirements deteriorates
Solution Approach 1:
The control valve employs five control edges with different sizes on the control piston to dynamically adapt to different work phases. During rapid piston movement, control edges 32 and 33 provide back feed paths matched to the large volume stream. During the holding phase, control edges 34 and 35 provide pressure release paths matched to the smaller volume stream. This dynamic adaptation allows the valve to maintain optimal performance across both rapid movement and holding phases without requiring complex switching mechanisms.
3Manufacturing precision
If five control edges with different sizes are implemented, then the hydraulic tension control precision is improved, but the device complexity increases
Solution Approach 1:
Each of the five control edges (32, 33, 34, 35, 36) on the control piston is designed with a specific size and shape tailored to its particular function and the local fluid flow requirements. Control edges 32 and 33 are sized for back feed operations, while control edges 34 and 35 are sized for pressure release operations, and control edge 36 manages the small stroke space. This local quality approach ensures that each control edge is optimally sized for its specific function, achieving precise hydraulic tension control without requiring complex external switching mechanisms.
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
This solution ensures exact hydraulic tension during all work phases, simplifies switching mechanisms, and maintains consistent pressure distribution, enhancing the control valve's performance by optimizing fluid flow and pressure management.
Implementation Method 1
hydraulic control valve for a differential cylinder working on one side with five control edges
Implementation Method 2
a valve-internal check valve with a pass-through device directed to connection A1
Implementation Method 3
in the section of the housing-internal bridges leading to the ring space belonging to the tank connection an externally controllable lock valve to open and close the connection from the internal ring channel to the tank connection T1
Data Source
AI summary
A hydraulic control valve to control a double-acting working cylinder having a piston with a piston rod on one side, at least four external connections, and a device to feed the fluid forced from the small stroke space of the working cylinder into the large stroke space while the piston rod is moving out, and further for independent switching of the working cylinder from the work stroke to slow movement with a subsequent holding state to release pressure from the small stroke space, and wherein a connection of the small stroke space to the tank can be switched on. The control valve has five control edges, with two separate line paths formed to feed the fluid forced out of the small stroke space back with a back-feed control edge and a pressure-release control edge is formed to release pressure from the small stroke space to the tank.