Crane Hook Storage Reliability via Hydraulic Pressure Feedback
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Solution Overview
Problem
Operators may falsely recognize that a crane's hook has been stored due to insufficient winding of the wire rope, leading to potential collisions with the ground or other objects due to vibrations during travel.
Innovation Solution
A crane equipped with a pressure sensor to detect hydraulic fluid pressure and a controller that activates an abnormality notification system if the pressure falls below a lower limit value or exceeds an upper limit value when the hook is stored, preventing false completion recognition and automatically stopping the hook storage operation if excessive loads are detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the hook is stored below the boom by winding up the wire rope, then the hook is prevented from swinging and colliding with the boom, but the operator may falsely recognize that the hook has been stored when winding up is insufficient
Solution Approach 1:
The system uses a pressure sensor to detect hydraulic fluid pressure during hook storage and provides feedback to the controller. When the pressure falls below a lower limit value or exceeds an upper limit value, the controller activates an abnormality notification section to alert the operator that the hook has not been properly stored, preventing false recognition of storage completion
Solution Approach 2:
The system performs preliminary detection of hydraulic pressure before allowing the operator to conclude that hook storage is complete. The controller monitors pressure during the storage process and only allows completion recognition when pressure remains within the predetermined range, ensuring proper storage before operation termination
2Loss of time
If the operator finishes the operation when hook storage is incomplete, then time is saved, but the hook may collide with the ground due to vibrations during traveling
Solution Approach 1:
The pressure sensor continuously monitors hydraulic fluid pressure during the hook storage process and provides real-time feedback to the controller. The abnormality notification section alerts the operator if pressure indicates incomplete storage, preventing premature operation completion that could lead to hook collision with the ground during traveling
3Extent of automation
If the hydraulic motor is used to move the winch for hook storage, then the storage operation is automated, but excessive pressure may indicate insufficient winding or excessive loads
Solution Approach 1:
The pressure sensor provides feedback on hydraulic fluid pressure to the controller during automated hook storage. When pressure falls below the lower limit or exceeds the upper limit, the controller activates the abnormality notification section to indicate that storage is not properly completed, ensuring reliability despite automation
Solution Approach 2:
The system replaces manual monitoring of hook storage with an automated hydraulic pressure detection system. The pressure sensor and controller work together to automatically detect storage completion status and notify the operator, substituting mechanical observation with sensor-based detection
Data Source
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AI summary
A crane 1, the hook (main hook 24) of which is stored on the lower end of a boom 7, and the winch (main winch 9) of which can be moved by a hydraulic motor 37, said crane being provided with a pressure sensor 55 capable of detecting the pressure of hydraulic fluid being delivered to the hydraulic motor 37, and a controller 61 capable of recognizing changes in the pressure of the hydraulic fluid on the basis of a signal from the pressure sensor 55, and also being provided with an anomaly warning means Mi capable of providing warning of anomalies pertaining to the storage of at least the hook (24), the controller 61 activating the anomaly warning means Mi when it is determined that the pressure of the hydraulic fluid when the hook has been stored is below a minimum value.