Cable Stringing Hydraulic Circuit for Emergency Tension Holding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Traditional cable stringing apparatuses face issues with safety and control, particularly in emergency situations, where sudden stops can lead to cable overload and damage, and existing safety systems are inefficient in preventing recoil and maintaining tension.
Innovation Solution
The apparatus incorporates proportional valves with reverse logic and protection valves to automatically secure the stringing process in emergency situations, ensuring maximum safety by maintaining maximum pressure and preventing overload, even in the absence of piloting power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional negative brake is used to hold the load automatically, then safety function is provided, but in emergency stop situations it generates recoil and overload on the cable
Solution Approach 1:
The patent extracts the harmful automatic closing function of the negative brake by introducing a decoupling device that separates the negative brake's closing action from the braking force application. This allows the negative brake to close without generating harmful recoil on the cable, while still maintaining its load-holding safety function through the separate action of the first and second brakes.
Solution Approach 2:
The patent introduces intermediary devices including a decoupling device that mediates between the negative brake and the cable tension system, and a third brake that acts as an intermediary to provide controlled braking force. These intermediaries prevent the direct transmission of harmful recoil forces to the cable while maintaining safety functions.
2Reliability
If brake machine stops suddenly in emergency, then safety function is activated, but tension control is lost and conductor may fall to ground
Solution Approach 1:
The patent prepares the system in advance by equipping it with multiple brakes (first, second, and third brakes) and a decoupling device that are pre-configured to take over tension control functions. In case of emergency stop, these pre-prepared components can immediately assume the role of maintaining cable tension without loss of control.
Solution Approach 2:
The patent applies different functions to different parts of the braking system: the first and second brakes handle primary tension control, the third brake provides auxiliary braking, and the decoupling device manages the negative brake's closing action separately. This distribution of functions across different components allows maintenance of tension control even when one part fails.
3Ease of operation
If traditional valve with piloted command is used to regulate drawing action, then control is provided, but in emergency power failure the valve moves to maximum open position and loses effectiveness
Solution Approach 1:
The patent inverts the traditional valve behavior by using a valve that closes automatically upon loss of piloting signal rather than opening. This reversed logic ensures that in emergency power failure situations, the valve maintains its regulating position or closes to prevent uncontrolled drawing, rather than moving to maximum open position as in traditional systems.
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 effectively secures the stringing apparatus in emergency situations, preventing cable overload and damage, and ensures safe operation by maintaining controlled tension, enhancing the reliability of mechanical and hydraulic components.
Implementation Method 1
a regulation and safety hydraulic circuit in which a work fluid flows
Implementation Method 2
proportional valves with reverse logic and protection valves to automatically secure the stringing process in emergency situations, ensuring maximum safety by maintaining maximum pressure
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Apparatus (10) for stringing cables (39), which comprises a work unit (11) carrying at least one rotating device (38) to support the cables (39), a unit (13) for winding and unwinding the cables provided with at least one reel (14) for winding and unwinding the cables (39), a regulation and safety hydraulic circuit (15) in which a work fluid flows and with which at least the work unit (11) and the unit (13) for winding and unwinding the cables (39) are associated.