Ball Screw Groove Damage Detection Between Circulation Circuits
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Solution Overview
Problem
Existing screw devices face difficulties in detecting damage to the groove of a screw shaft, particularly when the damage is hidden by the nut, due to the sensor's limited ability to detect displacement outside the circulation circuit, especially under short axial strokes.
Innovation Solution
The screw device incorporates at least two circulation circuits on the nut, with a sensor placed between them to detect displacement of the screw shaft's groove, allowing for effective detection of hidden damage by monitoring changes in the sensor's output as it passes over the groove.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sensor is provided at an end of the nut in the axial direction to detect groove displacement, then the detection capability is improved, but the damage hidden by the nut cannot be detected
Solution Approach 1:
The invention divides the detection area into multiple segments by providing at least two circulation circuits spaced apart axially, with sensors positioned between them. This segmentation allows the sensor to detect groove displacements at multiple locations along the screw shaft, ensuring that damage hidden by the nut body can be detected while maintaining measurement precision.
2Length of moving object
If the stroke of the nut or screw shaft in the axial direction is short, then the device compactness is improved, but the detection of hidden damage becomes difficult
Solution Approach 1:
The invention transitions from a single-point detection approach to a distributed detection approach by spacing multiple circulation circuits apart in the axial dimension. This allows the sensor to detect groove displacements at different axial positions simultaneously, enabling hidden damage detection even when the overall axial stroke is short and the nut covers most of the screw shaft.
3Ease of manufacture
If the sensor is placed outside the circulation circuit to detect displacement, then the sensor positioning is simplified, but the detection probability of hidden damage decreases
Solution Approach 1:
The invention uses the circulation circuit as an intermediary structure to position the sensor. The sensor is mounted on the nut and faces the screw shaft groove, with the circulation circuit serving as a reference structure. This intermediary arrangement maintains ease of manufacturing while enabling the sensor to detect groove displacements that indicate hidden damage.
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
This configuration enables high-probability detection of damage to the screw shaft's groove, even when hidden by the nut, by accurately measuring displacement between adjacent circulation circuits, enhancing the device's reliability and compactness.
Implementation Method 1
a sensor provided to the nut, the sensor being configured to detect a displacement of the groove of the screw shaft between the adjacent circulation circuits
Data Source
AI summary
A screw device is provided which can detect damage to a groove of a screw shaft, the damage being hidden by a nut, with a high probability. At least two circulation components are mounted on a nut in such a manner as to form at least two circulation circuits that circulate rolling elements. The nut is provided with a sensor that detects a displacement of a groove of a screw shaft between the adjacent circulation circuits.