Rotary-Head Probe Assembly With Curved Spring Contact Stability
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Solution Overview
Problem
Existing probe devices in rotating testing systems experience varying contact forces and positions relative to the test piece due to centrifugal forces, leading to probe wear, lifting off, or disruption of testing processes, especially at high speeds or varying diameters.
Innovation Solution
The probe device features a spring element wound around the rotational axis, providing a consistent contact force and position independent of centrifugal forces, with a cable guide design minimizing torque effects on the support arm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional spring element is used that is not wound around the rotational axis, then the probe device is simpler to manufacture, but the contact force and position of the probe vary with rotational speed due to centrifugal forces
Solution Approach 1:
The spring element is configured as a curved element wound around the rotational axis of the rotating head. This curvature allows the spring to engage the support arm at multiple points along its arc, creating a distributed force application that remains consistent regardless of the rotating head's speed. The curved geometry ensures that centrifugal forces do not cause variations in contact force or probe position.
2Reliability
If the spring element engages the support arm at a single point, then the device is simpler, but the contact force varies with the position of the support arm during rotation
Solution Approach 1:
The spring element is configured as a curved element wound around the rotational axis of the rotating head. This curvature allows the spring to engage the support arm at multiple points along its arc, creating a distributed force application that remains consistent regardless of the rotating head's speed. The curved geometry ensures that centrifugal forces do not cause variations in contact force or probe position.
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 maintains optimal probe contact and position regardless of rotational speed or test piece diameter, reducing wear and ensuring continuous testing without interruptions.
Implementation Method 1
at least one spring element that can be supported on the rotating head and engages the support arm. The spring element is provided for exerting a force on the support arm, which, as a result of this force, experiences a torque with respect to the rotation axis
Implementation Method 2
As the rotating head rotates, the spring element is subjected to centrifugal forces. The spring element is wound around the rotational axis, providing a consistent contact force and position independent of centrifugal forces
Implementation Method 3
the inspection of rod-shaped, round metallic semi-finished products for defects such as cracks and cavities using eddy current or flux leakage methods
Implementation Method 4
In the flux leakage method, however, the probes are in contact with the test piece and rub against its surface. They wear out and must be replaced regularly
Data Source
Figure 1~2
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Figure 5~6
AI summary
A probe assembly (19, 27) for a rotary head (1) comprises at least one support arm (21, 28, 29) rotatably mounted about an axis of rotation (8), at least one probe (22, 31) connected to the support arm (21, 28, 29), and at least one spring element (20, 30) that can be supported on the rotary head (1) and engages the support arm (21, 28, 29), and which is designed to exert a force on the support arm (21, 28, 29), causing the support arm to experience a torque about the axis of rotation (8). The support arm (21, 28, 29) has at least one receptacle (23) concentric with the axis of rotation (8) for the spring element (20, 30), which, when positioned on the receptacle (23), is at least partially curved about the axis of rotation (8). As a result, centrifugal forces acting on the spring element (20, 30) during the operation of the rotating head (1) have no influence on the tension of the spring element (20, 30).