Hydraulic Cylinder Line Rupture Safeguard With Adjustable Pressure Threshold
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Solution Overview
Problem
Existing line rupture safeguards for hydraulic cylinders have a fixed pressure differential, limiting their adaptability and effectiveness, particularly in industrial trucks where varying loads require different response thresholds.
Innovation Solution
A movable actuator adjusts the spring bias of the closure unit within the hydraulic cylinder, allowing the pressure differential for response to be set and adjusted based on internal pressure, enabling flexible operation and response to different load conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed pressure differential is used for the line rupture safeguard, then the device structure is simple, but the adaptability to different load conditions is limited
Solution Approach 1:
The invention applies the dynamics principle by making the actuator position adjustable during operation. The actuator can be displaced to different positions, which dynamically adjusts the spring bias and consequently the pressure differential at which the closure unit closes. This transforms a static, fixed-pressure-differential device into a dynamic one that can adapt to varying load conditions while maintaining a relatively simple overall structure.
Solution Approach 2:
The invention implements parameter changes by allowing the pressure differential threshold to be adjusted through actuator positioning. By changing the actuator's position parameter, the spring compression changes, which directly modifies the pressure differential parameter at which the safeguard activates. This enables the same device to operate effectively under different load conditions by simply adjusting the actuator position rather than changing the entire device configuration.
2Ease of operation
If a fixed spring bias is used, then the manufacturing is simpler, but the response pressure differential cannot be adjusted during operation
Solution Approach 1:
The invention makes the spring bias dynamic rather than fixed. The actuator's adjustable position allows the spring compression and resulting bias force to be changed during operation. This provides ease of operation by enabling users to adjust the response pressure differential according to actual load conditions, while the manufacturing complexity remains manageable because the adjustment mechanism builds upon the existing spring-biased closure unit design.
3Reliability
If the closure unit closes at a high pressure differential, then it provides robust protection against line ruptures, but it cannot detect smaller leaks or hose breaks
Solution Approach 1:
The invention enables parameter changes in the pressure differential threshold through actuator adjustment. By modifying the actuator position, users can change the spring bias and thereby adjust the pressure differential at which the closure unit activates. This allows the system to detect both small leaks (by lowering the threshold) and large ruptures (by raising the threshold), making the safeguard versatile across different failure modes while maintaining reliable detection capability.
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 adjustable solution allows the line rupture safeguard to respond with a minimum pressure differential at rated loads, optimizing lowering speeds while preventing uncontrolled movement during hose ruptures, and allowing faster lowering without triggering at lower pressures.
Implementation Method 1
The flow forces that cause the valve to close can be considered a pressure differential at the valve plate, wherein the upstream pressure, i.e., on the side of the lift cylinder, is greater than the downstream pressure, so that the pressure differential resulting therefrom generates a force directed downstream
Implementation Method 2
A line rupture safeguard possesses a spring-biased closure unit that is arranged adjacent to the interior of the hydraulic cylinder
Implementation Method 3
the pressure preferably acts like a force on the movable actuator which assumes a position relative to the closure unit under the effect of the force
Implementation Method 4
the pressure preferably acts like a force on the movable actuator
Implementation Method 5
the actuator possesses a movable cam follower that has a curved section which interacts with the spring-biased closure unit. The curved section converts a movement of the cam follower into a spring-biasing of the closure unit
Data Source
AI summary
A line rupture safeguard for a hydraulic cylinder that has a connecting line between a connection for the hydraulic cylinder and a connection for a hydraulic unit, wherein a spring-biased closure unit in the connecting line is biased in a position releasing the connecting line, and at least partially closes the connecting line when a pressure differential in the connecting line is exceeded. A movable cam follower is provided that has a curved section which interacts with the spring-biased closure unit, and whose position dictates the spring bias of the closure unit and the pressure differential for at least partially closing the closure unit.