Crane Boom Luffing Control for Excessive Arm Length Prevention
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Solution Overview
Problem
The boom and luffing mechanism of transporter cranes are prone to damage due to excessive arm length, posing safety hazards and the risk of the boom falling, despite existing safety measures like warning signs and manual guidelines.
Innovation Solution
A crane system equipped with tension, angle, and in-place detecting sensors, along with a controller, to monitor and prevent excessive arm length by prohibiting boom lifting when tension or angle thresholds are exceeded, ensuring safe operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the arm length of the boom is extended beyond the allowable value, then the working range and lifting capacity of the crane is improved, but the joint between the luffing mechanism and boom heel section experiences excessive stress causing damage and safety hazards
Solution Approach 1:
The controller proactively determines whether the arm length exceeds the allowable value before damage occurs by monitoring tension values and horizontal inclination angles. When excessive arm length is detected, the controller prohibits boom lifting operations in advance, preventing the joint from experiencing damaging stress levels.
Solution Approach 2:
The system continuously monitors the tension value of the luffing mechanism and the horizontal inclination angle of the boom, feeding this information back to the controller. Based on this feedback, the controller dynamically determines whether the arm length exceeds the threshold and adjusts operations accordingly, creating a closed-loop safety control system.
2Device complexity
If warning signs and manual guidelines are used to prevent excessive arm length, then the system complexity is minimized, but operator compliance cannot be guaranteed leading to potential damage
Solution Approach 1:
The crane system performs self-monitoring and self-protection by automatically detecting excessive arm length conditions and prohibiting boom lifting operations without requiring external intervention. The controller autonomously evaluates tension values and inclination angles, making safety decisions independently rather than relying on operator judgment or manual procedures.
Solution Approach 2:
The patent replaces manual safety procedures (warning signs, manual checks) with an automated electronic control system that uses sensors and a controller to monitor and enforce safety limits. This substitution of mechanical/manual safety measures with an automated control system ensures reliable enforcement of arm length restrictions.
Data Source
AI summary
Disclosed are a crane and a control method therefor. The crane comprises a body, a boom, a luffing mechanism, a tension sensor, and a controller. One end of the boom is rotatably connected with the body. The luffing mechanism is respectively connected to the body and the boom. The tension sensor is disposed on the luffing mechanism, and the tension sensor is used for detecting a tension value of the luffing mechanism to the boom. The controller is electrically connected to the tension sensor and the luffing mechanism, and the controller is configured to determine that the arm length of the boom exceeds an arm length threshold if the tension value is greater than a tension threshold.