Laser Receiver Mounting on Excavator Slewing Body
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Solution Overview
Problem
Work machines, such as hydraulic excavators, face challenges in accurately scraping ground surfaces while receiving a laser beam for guidance, as the laser beam receiver is prone to being blocked by soil, sand, or other objects when mounted on the blade, leading to reduced accuracy and potential damage.
Innovation Solution
A work machine design featuring a laser beam receiver mounted on the upper slewing body, which is positioned higher than the blade, combined with posture detection devices and a calculation unit that determines the cutting edge's height relative to the surface based on the laser beam receiving position, posture of the upper slewing body, and blade posture, allowing for accurate scraping and improved laser beam reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the laser beam receiver is mounted on the blade by way of a support rod, then the laser beam can be received for ground scraping guidance, but the work device is brought into contact with the laser beam receiver causing it to break
Solution Approach 1:
The laser beam receiver is relocated from the blade level to the upper slewing body, changing the spatial dimension of mounting. This vertical relocation separates the receiver from the work device's operational path, eliminating contact risk while maintaining laser reception capability through extended support structures
2Reliability
If the mounting position of the laser beam receiver is lowered to avoid contact with the work device, then the risk of contact damage is reduced, but the laser beam receiver becomes smeared with soil and sand causing it to malfunction or break
Solution Approach 1:
The receiver is positioned higher on the upper slewing body, utilizing vertical space to elevate it above the contamination zone created by blade operation. This dimensional relocation keeps the receiver clear of soil and sand while maintaining structural support through extended mounting mechanisms
3Reliability
If the mounting position of the laser beam receiver is lowered, then contact with the work device is avoided, but the laser beam is easily blocked by blocking objects such as materials on site
Solution Approach 1:
By mounting the receiver on the upper slewing body at a higher elevation, the system gains vertical clearance over potential blocking objects on the ground. This dimensional advantage provides an unobstructed line of sight to the laser beam source while maintaining receiver protection through strategic positioning
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables the work machine to accurately scrape the ground surface while receiving the laser beam, reducing the risk of blockages and damage, and allows for automatic adjustment of the blade's posture to match the surface height, enhancing operational accuracy and efficiency.
Implementation Method 1
a laser beam receiver provided to the upper sleving body and capable of receiving laser beam emitted from a laser beam emitter
Data Source
AI summary
A work machine includes: a first posture detection device which detects a posture of an upper slewing body with respect to a lower travelling body; a second posture detection device which detects a posture of a blade; a laser beam receiver which is provided to the upper slewing body and can receive a laser beam emitted from a laser beam emitter; and a calculation unit which calculates a height position of a cutting edge of the blade with respect to a surface to be constructed. The calculation unit calculates the height position of the cutting edge of the blade with respect to the surface to be constructed based on a laser beam receiving position where the laser beam is received by the laser beam receiver, a posture of the upper slewing body with respect to the lower travelling body, and a posture of the blade.