Excavator Cable Stand Control for Swing-Induced Cable Damage
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Solution Overview
Problem
Existing electrically driven excavators face damage to the feeding cable due to changes in the swing angle of the swing structure, leading to contact with the track structure or being trodden by the track structure during operation.
Innovation Solution
An electrically driven construction machine equipped with a cable stand having a revolvable holding unit, a connection sensor, swing angle sensor, rotational angle sensor, and a controller that computes the holding unit's position and controls a swing lock device to prevent damage by inhibiting swing actions when the cable is at risk of contact or being trodden.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the holding unit of the cable stand is made revolvable to suppress cable damage during swing, then the cable can accommodate swing movements, but the cable may contact the track structure or be trodden by the track structure depending on swing angle and travelling direction
Solution Approach 1:
The control unit receives swing angle sensor signals and rotational angle sensor signals to continuously monitor the position of the holding unit. Based on this feedback, the control unit determines whether the cable position is safe and controls the swing lock device accordingly to prevent harmful contact between the cable and track structure.
Solution Approach 2:
The patent replaces pure mechanical cable protection with an automated control system that uses sensors to detect cable position and a control unit to operate the swing lock device. This substitution allows for more precise and reliable protection compared to passive mechanical arrangements.
2Reliability
If the swing lock device is activated to prevent cable damage, then cable safety is improved, but the excavator cannot perform swing actions when cable connection is detected
Solution Approach 1:
The swing lock device is not statically locked when the cable is connected, but dynamically controlled based on real-time cable position feedback. The control unit adjusts the locking state according to whether the cable is in a safe position, allowing swing actions when safe and preventing them when dangerous.
Solution Approach 2:
The system changes the operational parameters of the swing lock device based on detected cable position parameters. When the cable position parameter indicates safety, the lock device is released to allow swinging; when the parameter indicates danger, the lock device is activated to prevent swinging.
Data Source
AI summary
An electrically driven construction machine that can suppress damage to a feeding cable is provided. An electrically driven excavator includes a swing angle sensor that senses the swing angle of a swing structure, a cable stand that is disposed on the swing structure and has a holding unit that holds a feeding cable, a rotational angle sensor that senses the rotational angle of the holding unit of the cable stand, a swing lock valve, and a controller. The controller computes the position of the holding unit of the cable stand on the basis of sensing results of the swing angle sensor and the rotational angle sensor when a connection sensor senses a state in which the feeding cable is connected to a feeding port. Further, the controller controls the swing lock valve to an interrupting state to inhibit a swing of the swing structure when the computed position of the holding unit goes outside a predetermined range.