Hydraulic Cylinder Line-Break Valve With Adjustable Pressure Threshold
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Solution Overview
Problem
Existing cable fracture protection systems in hydraulic cylinders are limited by a fixed pressure difference, restricting their flexibility and usability, particularly in industrial truck applications.
Innovation Solution
A hydraulic cylinder with a spring-tensioned locking unit and a movable positioning device that adjusts the spring preload, allowing the required pressure difference for partial closure to be set and adjusted, thereby enhancing flexibility and usability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed pressure difference is used for the line break protection device, then the device structure is simple, but the adaptability is limited
Solution Approach 1:
The patent applies the dynamics principle by making the spring preload adjustable through a movable adjusting device. The adjusting device can be positioned at different locations along the rod, and by changing the position of the adjusting device relative to the closure unit, the spring preload can be adjusted during operation. This transforms a static fixed-pressure system into a dynamic adjustable-pressure system, resolving the contradiction between simplicity and adaptability.
2Ease of operation
If the spring preload is fixed, then the manufacturing is simple, but the ease of operation is reduced
Solution Approach 1:
The adjusting device is designed to be movable during operation, allowing the spring preload to be adjusted without disassembling the device. This dynamic adjustment capability significantly improves ease of operation while maintaining relatively simple manufacturing through the use of a cam follower and adjustable positioning mechanism.
3Productivity
If the pressure difference for closure is fixed, then the device structure is simple, but the productivity is limited
Solution Approach 1:
The ability to adjust the spring preload during operation allows the line break protection device to be optimized for different operating conditions and productivity requirements. The movable adjusting device enables quick adaptation to changing demands without requiring device replacement, thereby improving productivity while adding minimal 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 solution provides a pressure- and load-dependent cable fracture protection, allowing for adjustable pressure differences and improved flexibility in hydraulic cylinder applications, including industrial trucks.
Implementation Method 1
The line rupture protection device has a spring-loaded closure unit that is arranged adjacent to the interior space of the hydraulic cylinder
Implementation Method 2
If a pressure difference across the closure unit is exceeded, it closes at least partially. The flow forces that cause the valve to close can be viewed as a pressure difference across the valve plate
Implementation Method 3
The line rupture protection device according to the invention has a movable adjusting device whose position relative to the closure unit sets the spring preload in the release position of the closure unit
Data Source
AI summary
Line rupture protection for a hydraulic cylinder, comprising a connecting line between a connection for the hydraulic cylinder and a connection to a hydraulic unit, wherein a spring-loaded locking unit in the connecting line is pre-tensioned to a position releasing the connecting line and, upon exceeding a pressure differential in the connecting line, at least partially closes it, wherein a movable cam plunger is provided, which has a cam section cooperating with the spring-loaded locking unit, the position of which determines the spring pre-tension of the locking unit and thus the pressure differential for at least partially closing the locking unit.