3D Measuring Head for Faster Robotic Arm Calibration
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Solution Overview
Problem
Current robotic arm calibration methods are time-consuming and costly due to the need for multiple axis measurements, with existing devices like laser interferometers and trackers being inefficient for high precision and cost-effective three-dimensional measurements.
Innovation Solution
A three-dimensional measuring device comprising a ball-shaped structure and X, Y, Z-axis measuring modules, which measures the three-dimensional coordinates of the robotic arm, allowing for simultaneous measurement of moving distances and providing calibration parameters, thereby reducing measurement time and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a laser interferometer is used to measure errors, then measurement precision can be achieved, but measurement time increases because one axis must be measured at a time and lens groups must be changed
Solution Approach 1:
The patent combines three separate axis measuring modules (X-axis, Y-axis, Z-axis) into a single integrated measuring device that can measure all three dimensions simultaneously. The measuring head includes multiple measuring structures arranged in different directions, allowing concurrent measurement of multiple axes without changing lens groups or reconfiguring the system between measurements.
Solution Approach 2:
The measuring device is designed with multi-functional capability to measure errors in three different spatial directions using a single device configuration. The measuring head incorporates measuring structures for X-axis, Y-axis, and Z-axis directions, enabling the device to perform multiple measurement functions simultaneously without requiring separate specialized instruments for each axis.
2Productivity
If a laser tracker is used for measurement, then measurement speed and precision are improved, but cost increases significantly
Solution Approach 1:
The patent divides the measuring device into modular components including a base, a movable measuring head, and three separate axis measuring modules. Each module can be manufactured independently using standard components, and the modular design allows for cost-effective production and assembly while maintaining measurement capabilities comparable to expensive laser trackers.
3Measurement precision
If multiple measuring devices are used to measure different axes, then comprehensive error measurement is achieved, but device complexity and cost increase
Solution Approach 1:
The patent integrates three axis measuring modules into a single measuring head that moves with the robotic arm. All three measuring structures are combined in one location, eliminating the need for multiple separate devices and reducing overall system complexity while maintaining comprehensive measurement capability across all axes.
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 proposed solution enables efficient and cost-effective calibration of robotic arms by saving measurement time and reducing fabrication costs, while providing precise three-dimensional coordinate measurements.
Implementation Method 1
the first position sensor measures a displacement amount of the first measuring structure
Implementation Method 2
the second position sensor measures a displacement amount of the second measuring structure
Implementation Method 3
the third position sensor measures a displacement amount of the third measuring structure
Data Source
AI summary
A three-dimensional measuring device includes a ball-shaped structure, an X-axis measuring module, a Y-axis measuring module and a Z-axis measuring module. The ball-shaped structure is moved and/or rotated in response to a movement of a movable object. The X-axis measuring module includes a first measuring structure and a first position sensor. The first measuring structure is movable along an X-axis direction and contacted with the ball-shaped structure. The Y-axis measuring module includes a second measuring structure and a second position sensor. The second measuring structure is movable along a Y-axis direction and contacted with the ball-shaped structure. The Z-axis measuring module includes a third measuring structure and a third position sensor. The third measuring structure is movable along a Z-axis direction and contacted with the ball-shaped structure.