Working Vehicle Jib Angle Detection Failure System
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Solution Overview
Problem
Working vehicles, such as crane vehicles, face instability due to overload conditions caused by the length and angle of their jibs or booms, and existing angle detection systems are prone to failure from exposure to weather, leading to inaccurate readings.
Innovation Solution
A system comprising a detection part on the jib or boom to monitor the angle, an acquisition part using the wire rope's feed length to determine the angle, and a control part that issues warnings and stops the winch if a failure is detected, switching to the acquired angle for overload prevention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the detection part is provided in the front end portion of the jib to detect the angle, then the angle detection function is achieved, but the detection part is exposed to weather such as rain and is susceptible to failure
Solution Approach 1:
The patent creates a virtual copy of the detection part's function by calculating the angle from wire rope feed length data. This virtual detection mechanism is not exposed to weather conditions, yet performs the same angle detection function, thereby protecting against weather-related failures while maintaining detection capability.
Solution Approach 2:
The patent introduces wire rope feed length as an intermediary measurement. Instead of directly measuring the angle with a sensor exposed to weather, the system measures the feed length of the wire rope and calculates the angle from this intermediate data, which is not affected by weather conditions.
2Reliability
If the detection part is provided on the jib to detect the angle for overload prevention, then the angle measurement is obtained, but the system cannot determine whether the detection part fails
Solution Approach 1:
The patent implements a feedback mechanism where the control device compares the angle detected by the detection part with the angle calculated from wire rope feed length. This feedback loop enables automatic detection of detection part failures by identifying discrepancies between the two angle measurements, allowing the system to recognize when the detection part has failed.
Solution Approach 2:
The patent performs an additional calculation of angle from wire rope feed length beyond what is strictly necessary for basic operation. This excessive action provides redundant data that enables failure detection of the detection part, sacrificing some computational resources for enhanced reliability.
3Stability of the object's composition
If the working vehicle uses outriggers to stabilize the body, then the stability is improved, but the vehicle may still be in overload condition depending on jib length and angle
Solution Approach 1:
The patent replaces direct mechanical angle sensing with a computational approach using wire rope feed length measurements. This substitution allows for more reliable angle determination that can be used to accurately assess overload conditions, complementing the mechanical stabilization provided by outriggers.
Data Source
AI summary
A working vehicle (1) configured to raise and lower one of a jib (7) and a boom (5) by using a wire rope (15) wound around a winch (12), the working vehicle (1) includes: a detection part (22) provided on one of the jib (7) and the boom (5) and configured to detect an angle of one of the jib (7) and the boom (5) controlled to be raised and lowered to determine whether or not an overload detection condition occurs or to perform overload prevention control; an acquisition part (52) configured to acquire the angle of one of the jib (7) and the boom (5) controlled to be raised and lowered, based on a feed length of the wire rope (15); and a determination part (53) configured to determine that a failure occurs when a difference between the angle detected by the detection part (22) and the angle acquired by the acquisition part (52) exceeds a predetermined tolerance.