Prism Mirror Measuring Jig for Hydraulic Excavator Calibration
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Solution Overview
Problem
In hydraulic excavator calibration, the accuracy of slewing position measurement is compromised when the slewing angle of the revolving unit is such that the prism mirror cannot be observed from the total station, leading to degraded calibration accuracy or inability to perform measurement.
Innovation Solution
A measuring jig with a prism mirror and attachment member is attached to the revolving unit, allowing the prism mirror to reflect projection light from an external measurement apparatus, enabling accurate measurement of the slewing position regardless of the slewing angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the prism mirror is mounted on the lower surface of the counterweight using a magnet, then the calibration setup is simple, but the prism mirror cannot be observed from the total station at certain slewing angles in small work machines
Solution Approach 1:
The patent moves the prism mirror from the lower surface of the counterweight to the tip end of the boom, changing the spatial dimension and position. This dimensional change ensures that the prism mirror remains observable from the total station regardless of the slewing angle, as the boom tip maintains a consistent line-of-sight relationship with the measurement apparatus.
Solution Approach 2:
The patent introduces a support structure as an intermediary component to hold the prism mirror at the boom tip. This support acts as a mediator between the boom and the prism mirror, ensuring stable positioning and consistent observability while allowing the prism mirror to be mounted in an optimal location for measurement.
2Ease of operation
If the prism mirror is mounted on the counterweight, then the mounting process is simple, but the calibration cannot be performed at all slewing angles
Solution Approach 1:
The patent relocates the prism mirror from the counterweight to the boom tip, changing the spatial dimension. This relocation expands the measurement range to include all slewing angles, as the boom tip position ensures continuous observability from the total station throughout the full range of motion.
Solution Approach 2:
The patent makes the measurement system universal by enabling calibration to be performed at any slewing angle. The boom tip mounting location provides multi-angular observability, allowing the same setup to work for all slewing positions rather than being limited to specific angles.
3Stability of the object's composition
If the prism mirror position is fixed on the counterweight, then the setup is stable, but projection light cannot be projected onto the prism mirror at certain angles
Solution Approach 1:
The patent changes the mounting position from the counterweight to the boom tip, a different spatial dimension. This change maintains stability through the support structure while improving reliability by ensuring that projection light can always reach the prism mirror regardless of the slewing angle.
Solution Approach 2:
The support structure serves as an intermediary that stabilizes the prism mirror at the boom tip. This mediator ensures both stable mounting and reliable observability, as the support positions the prism mirror in a location that maintains consistent line-of-sight with the total station throughout operation.
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 ensures accurate calibration of hydraulic excavator parameters by allowing observation of the prism mirror at any slewing angle, even in small work machines, thereby improving measurement precision.
Implementation Method 1
The prism mirror reflects projection light from the external measurement apparatus
Data Source
AI summary
A measuring jig is attached to an antenna support member of a revolving unit, and used to measure a slewing position of the revolving unit together with an external measurement apparatus. The measuring jig includes a prism mirror and an attachment member. The prism mirror reflects projection light from the external measurement apparatus. The attachment member attaches the prism mirror to the antenna support member. The attachment member is configured to be attached to the antenna support member by sandwiching an attached portion.