Angle Scale Positioning with Two-Sensor Offset Centering
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing angle measuring systems face challenges in achieving precise positioning and centration of a body with an angle scale, especially when the pivotability of the machine part is limited to less than 360°, due to the complexity of aligning dial gauges concentrically around the axis.
Innovation Solution
A method involving the use of two stationary distance measuring devices, offset by an angle relative to the body's lateral surface, to determine and calculate offset values for precise positioning, allowing for accurate adjustment without requiring full 360° rotation, using a body with an angular scale and a lateral surface along an arc of a circle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single dial gauge is used to position a body concentrically around an axis, then the positioning can be performed with simple equipment, but the dial gauge must be moved exactly on a circular path which increases the complexity of the positioning process
Solution Approach 1:
The patent divides the positioning task into two independent measurement channels by using two distance sensors positioned at different angular locations. Each sensor measures distance variations independently, and the body is positioned by satisfying both measurement conditions simultaneously, eliminating the need for complex circular path movement of a single dial gauge.
Solution Approach 2:
The patent transitions from a single circular path measurement (one-dimensional constraint) to a two-dimensional measurement space by positioning two distance sensors at different angular locations. This allows the body to be positioned by satisfying two independent distance constraints rather than requiring precise circular motion of a single sensor.
2Measurement precision
If two dial gauges are used to minimize shaft tilt, then the positioning accuracy is improved, but the equipment complexity and the requirement for 180° axial offset increases the device complexity
Solution Approach 1:
The patent makes the two distance sensors serve multiple functions: they simultaneously measure radial positioning and angular orientation of the body. By positioning the sensors at a specific angular offset, the same measurement setup can determine both the concentricity and the angular alignment, eliminating the need for separate measurement procedures.
Solution Approach 2:
The patent changes the measurement parameters by using distance sensors that measure radial distance variations as the body rotates through a limited angle. By analyzing the distance variations at two different angular positions, the system can calculate the body's radial offset and angular orientation, achieving precise positioning without requiring 180° axial offset or full 360° rotation.
3Measurement precision
If the body is positioned using traditional dial gauge methods, then full 360° rotation is required for accurate centration, but this is not possible when the machine part has limited pivotability
Solution Approach 1:
The patent achieves accurate centration with only a partial rotation of the body (less than 360°). By using two distance sensors positioned at different angular locations and measuring distance variations during this limited rotation, the system can calculate the radial offset and angular orientation, obtaining the same positioning information that would traditionally require a full rotation.
Solution Approach 2:
The patent introduces angular position markers as an intermediary element that allows the system to track the rotational position of the body during limited rotation. These markers enable the distance sensor measurements to be correlated with specific angular positions, allowing accurate calculation of the body's orientation and position even when the rotation angle is less than 360°.
4Measurement precision
If the angular scale is eccentric to the rotation axis, then the angle measurement accuracy deteriorates, but achieving precise alignment is difficult with limited rotation capability
Solution Approach 1:
The patent uses the distance sensor measurements as feedback to determine the body's radial offset and angular orientation. By analyzing the distance variations at two different angular positions, the system calculates the required adjustments to achieve concentric alignment, providing quantitative feedback that guides the positioning process and ensures the angular scale is properly aligned with the rotation axis.
Data Source
AI summary
The invention relates to a method for positioning a body (3) which has a lateral surface extending along a circular arc (3.1) comprises the following steps: attaching the body (3) to a pivotable machine part (4), attaching a stationary first distance sensor (1), attaching a stationary second distance sensor (2), determining both three first distance values (x1a, x1b, x1c) and three second distance values (z2a, z2b, z2c) at three defined, distinct angular positions (ϕa, ϕb, ϕc) of the machine part (4), calculating a first offset value (O1) based on the three first distance values (x1a, x1b, x1c) and the corresponding angular positions (ϕa, ϕb, ϕc) and a second offset value (O2) based on the three second distance values (z2a, z2b, z2c) and the corresponding angular positions (ϕa, ϕb, ϕc), and moving the body (3) relative to the machine part (4) until the first offset value (O1) is determined by the first distance sensor (1) and the second offset value (O2) is determined by the second distance sensor (2) within permissible deviations.(Figure 1).