Construction Machine Motion Restriction via Hydraulic Flow Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Construction machines face challenges in efficiently restricting and then canceling motion restrictions when detecting objects around them, aiming to enhance safety while maintaining work efficiency.
Innovation Solution
A construction machine equipped with a surroundings monitoring system that includes cameras, a controller, and a hydraulic drive system, allowing for the detection of objects and adjustment of motion restrictions through a cancellation switch, enabling the operator or others to relax or cancel restrictions based on safety assessments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the motion of the construction machine is restricted by reducing the flow rate of the hydraulic pump in response to detection of an object, then safety is improved, but work efficiency deteriorates
Solution Approach 1:
The hydraulic pump's flow rate is dynamically adjusted based on detection results. When an object is detected, the flow rate is reduced to restrict motion for safety. When no object is detected, the flow rate returns to normal for efficient work. This dynamic adjustment resolves the contradiction between safety and work efficiency.
Solution Approach 2:
The system uses detection means to continuously monitor the environment and provides feedback to the control device, which adjusts the hydraulic pump's flow rate accordingly. This closed-loop feedback mechanism enables the system to automatically balance safety requirements with work efficiency based on real-time conditions.
2Reliability
If the motion restriction is maintained to ensure safety, then protection of detected objects is improved, but loss of time increases
Solution Approach 1:
The motion restriction is applied periodically rather than continuously. The detection means continuously monitors for objects, and motion restriction is activated only during periods when objects are detected. When objects are no longer detected, the restriction is lifted and normal operation resumes. This periodic application minimizes time loss while maintaining protection.
Solution Approach 2:
The detection means operates in advance to detect objects before they become a hazard. By detecting objects early, the system can proactively apply motion restriction before dangerous situations develop, allowing for safer operation without excessive time loss from unnecessary restrictions.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A construction machine capable of further increasing safety in the case of imposing a motion restriction on the construction machine and canceling the motion restriction based on detection of a person around the construction machine is provided. For this purpose, a surroundings monitoring system for a work machine according to an embodiment includes a detecting part configured to detect a predetermined object present within a predetermined area around the construction machine, a restricting part configured to impose a motion restriction on the construction machine by decreasing the flow rate of hydraulic oil supplied to a hydraulic actuator of the construction machine, in response to detection of the object present within the predetermined area by the detecting part, and a restriction degree controlling part configured to relax or cancel the motion restriction by increasing the flow rate, in response to a predetermined operation for relaxing or canceling the motion restriction being performed in the cabin of the construction machine or in response to the object being no longer detected within the predetermined area by the detecting part, after the start of the motion restriction by the restricting part.