Swing Operating Machine Dynamic No-Entry Area Control
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Solution Overview
Problem
The existing rotation type working machines have a uniform no-entry area size regardless of their operational state, leading to inappropriate control of rotation operations due to varying probabilities of attachment contact, resulting in either unnecessary stops or failure to stop when contact probability is high.
Innovation Solution
A rotation type working machine with a control method that considers the current angular velocity and moment of inertia of the attachment to dynamically adjust the no-entry area based on the detected position of an entering object, allowing for appropriate control of the rotation operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a uniform no-entry area size is used regardless of current operation, then the control system is simple, but the rotation operation may be stopped unnecessarily when contact probability is low or may not be stopped when contact probability is high
Solution Approach 1:
The no-entry area size is dynamically adjusted based on the current rotational speed of the attachment. When rotational speed is high, the no-entry area is enlarged; when rotational speed is low, the no-entry area is reduced. This dynamic adjustment ensures appropriate stop control under varying operational conditions while maintaining system reliability.
Solution Approach 2:
The physical parameter of no-entry area size is changed according to the rotational speed parameter. By establishing a relationship between rotational speed and no-entry area size, the system adapts the safety zone dimensions to the current operational state, preventing unnecessary stops and ensuring safety when needed.
2Reliability
If the no-entry area is enlarged to ensure safety when contact probability is high, then safety is improved, but the rotation operation is unnecessarily stopped when contact probability is low
Solution Approach 1:
The no-entry area size dynamically adapts to the current rotational speed, being enlarged only when rotational speed is high (when contact probability is high) and reduced when rotational speed is low. This prevents unnecessary stops that would harm productivity while maintaining safety when actually needed.
Solution Approach 2:
The no-entry area parameter is changed based on the rotational speed parameter, creating a conditional safety zone that expands or contracts according to operational conditions. This ensures safety improvements only when contact probability is high, avoiding productivity loss from unnecessary stops.
3Productivity
If the no-entry area is reduced to maintain productivity, then rotation operation efficiency is improved, but the rotation operation may not be stopped when contact probability is high
Solution Approach 1:
The no-entry area dynamically expands when rotational speed increases (indicating high contact probability) and contracts when rotational speed decreases. This ensures that safety is maintained during high-speed operations while minimizing restrictions during low-speed operations, balancing productivity and safety.
Solution Approach 2:
The no-entry area parameter is adjusted according to rotational speed parameter changes. When rotational speed is high, the no-entry area is enlarged to ensure safety; when rotational speed is low, the no-entry area is reduced to maintain productivity. This conditional adjustment resolves the contradiction between safety and efficiency.
Data Source
AI summary
A rotation type working machine includes: an attachment mounted so as to be able to rotate with respect to a base body; a rotation mechanism which rotates the attachment; a control device which controls the rotation mechanism; and an entering object detection device which detects a position of an entering object entered into a work area, in which the control device controls a rotation operation of the attachment based on a first physical amount related to at least one of a current angular velocity of the attachment and a current moment of inertia of the attachment, and the position of the entering object detected by the entering object detection device.