PCB Planar Coil Metal Detection in Conveyor Belt Scales
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Solution Overview
Problem
Existing conveyor belt scales with metal detectors require complex designs due to the use of circular coils, which complicate the detection of small metal foreign matter in foodstuffs.
Innovation Solution
Integration of planar coils on a printed circuit board within the conveyor belt structure, allowing for a simpler and more reliable detection system with transmitter and receiver coils arranged in a parallel configuration, eliminating the need for additional machine-mounted accessories.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If circular coils are used for metal detection, then detection capability is achieved, but device complexity increases
Solution Approach 1:
The patent applies the inverse of this principle by using planar (flat) coils instead of circular (curved) coils. The planar coils are arranged in a flat configuration on the conveyor belt, eliminating the need for complex circular structures while maintaining the electromagnetic detection function. This simplifies the overall device structure and reduces manufacturing complexity.
Solution Approach 2:
The patent replaces the traditional mechanical circular coil structure with an electromagnetic planar coil system integrated onto a printed circuit board or flat substrate. This substitution reduces mechanical complexity while maintaining the essential metal detection capability through electromagnetic induction.
2Reliability
If additional machine-mounted accessories are added for metal detection, then detection function is improved, but device complexity increases
Solution Approach 1:
The patent merges the metal detection function directly into the conveyor belt structure by integrating planar coils onto the belt or its support framework. This eliminates the need for separate machine-mounted accessories, as the conveyor belt itself becomes part of the detection system. The transmitter and receiver coils are combined in a compact arrangement on the same plane.
Solution Approach 2:
The conveyor belt system is designed to perform multiple functions: material transport and metal detection. By integrating the detection coils into the belt structure, the system achieves multi-functionality without requiring additional dedicated accessories, thereby reducing overall device complexity.
3Device complexity
If planar coils are used instead of circular coils, then device complexity is reduced, but detection precision may be affected
Solution Approach 1:
The patent transitions from three-dimensional circular coils to two-dimensional planar coils, changing the dimensional configuration of the electromagnetic field generation. This dimensional change simplifies the structure while the planar arrangement maintains sufficient detection precision for small metal foreign matter through optimized coil geometry and positioning.
Solution Approach 2:
The patent changes the geometric parameters of the coils from circular to planar configuration. By optimizing parameters such as coil area, wire diameter, turn density, and spacing in the planar arrangement, the system maintains detection precision equivalent to circular coils while achieving structural simplicity and ease of manufacturing.
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
Facilitates efficient detection of small metal objects by reducing complexity and cost while maintaining operational reliability, ensuring thorough coverage of the conveyor belt width with minimal interference from the conveyor structure.
Implementation Method 1
a metal detector, which has a transmitter coil and a receiver coil
Implementation Method 2
Metal detectors use X-ray technology or a tunnel that is formed by a circular coil
Data Source
AI summary
A conveyor belt scales for transporting goods includes: a feed belt; a weighing belt; and a removal belt. The weighing belt is supported on a load cell that detects a weight of the goods transported by the weighing belt. The conveyor belt scales further has a metal detector, which includes a transmitter coil and a receiver coil. The transmitter coil and the receiver coil are each a planar coil.