Crane Turning Control for Load Shaking Prevention

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Solution Overview

Problem

In cranes, load shaking occurs when the turning operation is stopped, posing a risk of the suspended load contacting obstacles such as buildings.

Innovation Solution

A work machine with a drive control unit that controls the turning operation of the crane and a detection unit that detects obstacles around the crane. The drive control unit maintains the turning operation or decelerates it smoothly if an obstacle is detected during the turning operation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the turning operation is stopped when an obstacle is detected, then collision avoidance is improved, but load shaking occurs causing safety risks

Engineering Contradiction:

Improvecollision avoidanceVSAvoidload shaking

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The control unit dynamically adjusts the turning operation based on real-time obstacle detection. When an obstacle is detected during turning, the system maintains the turning operation rather than stopping abruptly, thereby preventing load shaking while still avoiding collision through continuous monitoring and dynamic response adjustment.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system changes the operational parameters of the turning body by maintaining the turning operation instead of stopping. This parameter change (from stop to continue turning) prevents the pendulum-like load shaking that would occur with sudden stopping, while the obstacle detection system ensures collision avoidance through continuous parameter monitoring.

Inventive Principle:

Principle #35Parameter changes

2Object-affected harmful factors

If the turning operation is maintained when an obstacle is detected, then load shaking is prevented, but collision risk increases

Engineering Contradiction:

Improveload shaking preventionVSAvoidcollision avoidance

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The control unit continuously receives feedback from the detection unit about obstacle presence and position. This feedback loop allows the system to maintain the turning operation (preventing load shaking) while dynamically adjusting based on real-time obstacle information, thereby preventing collision through continuous monitoring and responsive control adjustments.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The detection unit and control unit work together in a self-regulating system where the control unit automatically adjusts the turning operation based on detection unit input. This self-service mechanism ensures that the turning operation is maintained to prevent load shaking while the integrated detection system independently monitors and prevents collision risks.

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS12312220B2Work machine collision safety controls and warnings

Publication Date: 2025.05.27 KOBELCO CONSTR MASCH CO LTD

AI summary

The present invention provides a work machine in which load shaking of a crane in emergency can be prevented. In the work machine, a turning body is disposed to be turnable relative to a base body. The work machine includes a drive control unit which controls a turning operation of the turning body, and a detection unit which detects an obstacle present around the turning body. The drive control unit does not start turning of the turning body in a case where the obstacle is detected by the detection unit while the turning of the turning body is stopped, and maintains the turning of the turning body for at least a predetermined period in a case where the obstacle is detected by the detection unit during the turning of the turning body.