Tin Cylinder Position Sensing for Accurate Wave Soldering Gap Control
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Solution Overview
Problem
Inaccurate motion distance detection of the tin cylinder in wave soldering leads to poor welding quality between a PCB board and components due to deviations in the distance of the tin cylinder from the PCB board, affecting the positioning of the liquid metal tin peaks.
Innovation Solution
A position detection apparatus with a movable abutting member, trigger member, and induction member, where the trigger member bypasses the distance sensor, ensuring the sensing plane remains parallel to the induction plane, and the distance sensor is fixedly connected to the bottom plate, enhancing detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the trigger member is connected to the distance sensor directly, then the structure is simpler, but the detection accuracy deteriorates due to motion interference
Solution Approach 1:
The trigger member is divided into separate components: the abutting member that contacts the tin cylinder, the trigger member with levers that transmits motion, and the induction member that interfaces with the distance sensor. This segmentation isolates the motion transmission path from the sensing path, allowing accurate detection while maintaining mechanical linkage.
Solution Approach 2:
The induction member acts as an intermediary between the trigger member and the distance sensor. It translates the mechanical motion of the trigger member into a form suitable for optical detection by the distance sensor, while the trigger member bypasses the distance sensor to avoid direct connection and potential interference.
2Measurement precision
If the distance sensor moves with the trigger member, then the relative position is maintained, but the detection accuracy deteriorates due to relative motion errors
Solution Approach 1:
Instead of moving the distance sensor with the trigger member, the invention inverts the approach by keeping the distance sensor fixed and moving the induction member. This inversion allows the sensing element to remain stable while the target element moves, eliminating relative motion errors.
Solution Approach 2:
The induction member is pre-positioned on the trigger member at a specific offset distance from the sensing plane. This preliminary positioning ensures that when the trigger member moves, the induction member maintains a stable relative relationship with the fixed distance sensor, enabling accurate detection without requiring the sensor to move.
3Measurement precision
If the sensing plane is not parallel to the induction plane, then the structure is more flexible, but the detection accuracy deteriorates due to angular errors
Solution Approach 1:
The invention ensures that specifically the sensing plane and induction plane maintain parallel alignment, while other parts of the mechanism can have flexible arrangements. This localized quality control focuses the parallelism requirement only where it matters for detection accuracy, between the sensing plane and induction plane.
Solution Approach 2:
The sensing plane and induction plane are pre-aligned to be parallel during assembly. This preliminary alignment action ensures that the critical detection surfaces are properly oriented before the mechanism begins operation, eliminating the need for complex real-time alignment mechanisms.
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
Improves the detection accuracy of the tin cylinder's movement relative to the distance sensor, ensuring precise control of the liquid metal tin's distance from the PCB board, thereby enhancing welding quality.
Implementation Method 1
The induction member and the distance sensor are disposed such that: the distance sensor is capable of detecting a movement distance of the induction member when the abutting member drives the induction member to move
Data Source
AI summary
The present application provides a position detection apparatus, comprising a bottom plate, an abutting member, a trigger member, a trigger member, and a distance sensor. The abutting member is movably disposed on the bottom plate. The trigger member is connected to the abutting member. The induction member is disposed on the trigger member. The distance sensor is disposed on the bottom plate. The induction member and the distance sensor are disposed such that: the distance sensor is capable of detecting a movement distance of the induction member when the abutting member drives the induction member to move, and wherein the trigger member bypasses the distance sensor. The position detection apparatus of the present application has a higher detection accuracy of relative movement of the induction member to the distance sensor.