Clamp Device Cam Surface Proximity Sensor Detection
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Solution Overview
Problem
Conventional clamp devices indirectly detect the rotating state of the clamp arm, leading to inaccuracies in machining and assembling processes, making it difficult to improve detection accuracy.
Innovation Solution
A clamp device with a rotatable shaft and a cam portion having a varying radial distance along the circumferential direction, equipped with a cam surface proximity sensor for direct detection of the rotational position, along with a determination unit for clamp and unclamp states, and adjustable rotation angle range for accommodating different workpiece shapes and sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If indirect detection method using detection portion connected to piston rod is used, then device complexity is reduced, but measurement precision of clamp arm rotating state deteriorates
Solution Approach 1:
The patent replaces the indirect mechanical detection system (detection portion connected to piston rod) with a direct detection system using a cam surface proximity sensor that detects the cam surface on the rotatable shaft. This substitution eliminates the need for mechanical linkages while achieving direct measurement of the clamp arm's rotational position, thereby improving measurement precision without significantly increasing device complexity.
2Measurement precision
If direct detection of clamp arm rotating state is implemented, then measurement precision improves, but device complexity increases
Solution Approach 1:
The patent introduces a cam surface as an intermediary element on the rotatable shaft that translates the rotational position into a detectable proximity signal. The cam surface proximity sensor detects the position of this cam surface, which varies in radial distance along the circumferential direction. This intermediary approach enables direct detection of rotational state with simple sensor placement, achieving high measurement precision without complex detection system architecture.
3Measurement precision
If cam surface proximity sensor is used for detection, then measurement precision improves, but vulnerability to welding direct current increases
Solution Approach 1:
The patent employs a cam surface proximity sensor that operates on electromagnetic induction principles rather than magnetic field detection. This sensor type detects the position of the cam surface through changes in electromagnetic field caused by the conductive cam surface, making it less vulnerable to interference from welding direct current compared to magnetic sensors. The sensor maintains high measurement precision while demonstrating improved stability in welding environments.
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 clamp device achieves direct and accurate detection of the rotating state of the clamp arm, ensuring reliable clamp and unclamp states, and allows for easy adjustment to fit various workpieces, while operating stably in welding environments and being compact in design.
Implementation Method 1
a cam surface proximity sensor for detecting the position of the cam surface which is displaced as the rotatable shaft rotates
Data Source
AI summary
A clamp device is provided with a detection section which detects the pivotal position of a clamp arm. The detection section has: a cam section which is provided on a pivot shaft, includes a predetermined cam surface, and is formed so that the radial distance from the center of the pivot shaft to the cam surface varies circumferentially; and a proximity sensor which detects the position of the cam surface which varies as the pivot shaft pivots.