Cable Recovery Hydraulic Control for Overload Tension Holding
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Solution Overview
Problem
Traditional cable recovery machines lack effective safety systems to maintain controlled tension during cable stringing operations, particularly in overload situations, which can lead to unintended cable release and safety hazards.
Innovation Solution
A cable recovery machine equipped with a hydraulic pump of variable cubic capacity and a piloted proportional valve system, controlled by a servo controller, which adjusts pressure to maintain set tension and prevent cable unwinding in case of overload by reducing the hydraulic pump's cubic capacity to zero, ensuring the hydraulic motor stops and the cable is not released.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional overload control device is used that allows cable unwinding in emergency situations, then the cable can be unwound with controlled tension, but the drawing action on the cable is compromised and safety is reduced
Solution Approach 1:
The system preemptively prevents the harmful effect of uncontrolled cable release by using the piloted proportional valve to cut off hydraulic fluid supply to the servo controller before overload can cause dangerous unwinding. The valve closes when pilot pressure exceeds the threshold, stopping the hydraulic motor and maintaining cable tension before the emergency situation escalates.
Solution Approach 2:
The piloted proportional valve acts as an intermediary safety device between the hydraulic pump and the servo controller. It uses pilot pressure from the hydraulic system to automatically control the main fluid flow, providing a safety mechanism that mediates between the need for controlled cable unwinding and the need to prevent dangerous release.
2Adaptability or versatility
If the hydraulic pump maintains variable cubic capacity for flexible operation, then the machine can adapt to different stringing conditions, but the system lacks safety control in overload situations
Solution Approach 1:
The system uses feedback from the pilot pressure (which reflects the hydraulic system's operating pressure) to automatically control the piloted proportional valve. When the pilot pressure exceeds the preset threshold, the valve closes, providing automatic feedback-based safety control that maintains adaptability during normal operation while preventing overload damage.
3Reliability
If the piloted proportional valve closes to stop hydraulic motor movement, then the cable tension is maintained and safety is improved, but the cable unwinding capability is reduced
Solution Approach 1:
The system changes the operating parameters of the hydraulic pump by using the piloted proportional valve to control the servo controller, which adjusts the pump's cubic capacity. This allows the system to maintain full unwinding capability during normal operation and automatically adjust to a safe state (zero or reduced cubic capacity) when overload conditions are detected.
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 high-safety system that maintains controlled tension on the cable, preventing unwanted unwinding and ensuring the cable is not released, even in overload conditions, thereby enhancing operational safety during cable stringing.
Implementation Method 1
at least one hydraulic pump with variable cubic capacity... and at least one hydraulic motor powered by the hydraulic pump by means of at least one pipe to deliver a fluid
Data Source
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AI summary
Machine to recover a cable, comprising at least one hydraulic pump (19) with variable cubic capacity, provided with a system (23) to adjust the cubic capacity, driven by a servo controller (24), and at least one hydraulic motor (21) fed by said hydraulic pump (19) by means of at least one pipe (22) to deliver a fluid and at least one pipe (37) to return the fluid.