Mobile Crane Reaction Force Detection for Safe Assembly
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Solution Overview
Problem
Operators of mobile cranes face challenges in safely raising and lowering tiltable attachments during assembly, disassembly, and overload tests due to the need for precise input of boom and jib information, leading to potential safety risks and errors, especially when dealing with different crane specifications.
Innovation Solution
A mobile crane equipped with a physical quantity detector that senses changes in reaction forces from the ground, providing stability information to operators through a notification device, allowing for safe operation without overburdened input operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the moment limiter sets hoisting performance for the work range of the hoisting work, then the safety during hoisting work is ensured, but the assembly work and disassembly work cannot be performed in situations deviating from the hoisting work range
Solution Approach 1:
The moment limiter is modified to change its operational parameters based on the work mode. It can operate in a first mode for hoisting work with predetermined hoisting performance limits, and in a second mode for assembly/disassembly work where the limit is removed or relaxed, allowing the boom to be lowered to smaller inclination angles safely
2Ease of operation
If the operator determines the inclination angle based on experience and knowledge, then the assembly and disassembly work can be performed, but the safety cannot be assured due to lack of automated monitoring
Solution Approach 1:
A detection device provides real-time feedback on the boom's inclination angle to the control system. The control system automatically compares the detected angle with predetermined threshold values and provides visual or audible warnings to the operator when safety thresholds are approached, eliminating reliance on operator experience alone
3Adaptability or versatility
If the moment limiter is stopped or limit is released for assembly and disassembly work, then the boom angle can be decreased, but the operator requires extensive experience and knowledge to determine safety
Solution Approach 1:
The control system automatically manages the moment limiter settings based on the detected work mode. When assembly or disassembly work is detected, the system automatically switches to the second mode with relaxed limits, eliminating the need for operators to manually adjust settings or possess specialized knowledge about when to release limits
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 system enables safe and efficient raising and lowering of tiltable attachments by detecting necessary physical quantities, reducing operator reliance on manual input and enhancing safety across various crane operations and specifications.
Implementation Method 1
a physical quantity detector 90 configured to detect a physical quantity which changes in accordance with a change in the reaction force received from the ground by the reaction force receiving part
Data Source
AI summary
A mobile crane includes: a lower traveling body including a pair of crawlers; an upper slewing body supported on the lower traveling body slewably about a slewing axis; a tiltable attachment including a boom tiltably supported on the upper slewing body; and a physical quantity detector. The lower traveling body has a reaction force receiving part for receiving a reaction force from the ground at a position away from the slewing axis in a boom direction in a state where the pair of crawlers are in contact with the ground, the boom direction coinciding with a horizontal component of a direction in which the boom extends from the upper slewing body, and the physical quantity detector detects a physical quantity which changes in accordance with a change in the reaction force received from the ground by the reaction force receiving part.