Metal Detector Rod Layout for Waterproof Replaceable Search Coils
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Solution Overview
Problem
Current metal detectors face issues with heavy weight due to spring cables, EMI interference from embedded circuit boards, damage to external cables, and high costs when replacing detection discs, especially in underwater environments.
Innovation Solution
A metal detector design with electronic components housed within a protective sleeve in the detection rod, allowing for detachable and replaceable detection discs, featuring a main and secondary circuit board configuration and a waterproof cable connection system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the circuit board is placed within a separate control box connected via spring cables, then the metal detector can be assembled, but the overall weight increases and the cable is prone to damage
Solution Approach 1:
The patent merges the control box and detection disc into a single integrated detection rod structure. The circuit board is mounted directly within the detection rod housing, eliminating the need for separate control box and spring cable components. This integration reduces the overall weight while maintaining assembly feasibility through modular internal components.
2Ease of manufacture
If external cables are used to connect the control box, then the metal detector can function, but the cables are easily damaged by external forces and create antenna effects leading to EMI interference
Solution Approach 1:
The patent extracts and eliminates the external spring cable component from the system. By integrating the circuit board directly into the detection rod, the harmful external cable connection is removed entirely, preventing cable damage and eliminating the antenna effect that causes EMI interference.
3Volume of moving object
If the circuit board is embedded within the detection disc, then the structure is compact, but the detection coils tightly surround the electronic circuit causing strong induced electromotive forces and EMI interference
Solution Approach 1:
The patent segments the detection rod into distinct functional zones: the detection coils are positioned in one section while the circuit board is mounted in a separate section with physical spacing. This segmentation prevents the coils from tightly surrounding the electronic circuit, reducing induced electromotive forces and EMI interference while maintaining overall structural compactness.
4Device complexity
If wireless technology is used to transmit signals, then the structure can be simplified, but underwater communication is interrupted and replacement of detection disc becomes costly
Solution Approach 1:
The patent introduces a waterproof cable connector as an intermediary component that enables reliable electrical connection between the detection disc and circuit board while maintaining waterproof integrity. This connector allows for easy disc replacement and maintains signal transmission reliability in underwater environments, avoiding the limitations of wireless technology.
Data Source
AI summary
A metal detector includes a detection disc, a detection rod rotationally connected to the detection disc, a protective sleeve detachably connected within the detection rod, and electronic components housed within the protective sleeve. The electronic components include a main circuit board extending along the length of the protective sleeve and a secondary circuit board perpendicular to the main circuit board, positioned near the opening of the protective sleeve. On the side of the secondary circuit board facing the interior of the detection rod, there is a detection disc socket. The detection disc includes a coil, a waterproof cable connected to the coil, and a detection disc plug located at the end of the waterproof cable. The waterproof cable and detection disc plug extend into the detection rod, allowing the detection disc plug to be inserted into the detection disc socket.