Shielded Coil Assembly for Foreign Matter Detection
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Solution Overview
Problem
Existing pick-up devices in pipe conveyor systems face challenges in accurately detecting foreign matter due to interference from stray currents and electromagnetic fields, which can lead to false measurement results and complex installation processes.
Innovation Solution
The solution involves a non-metallic pipe section surrounded by coils within a metallic shielding housing, with electrically insulated connections to the metal transport pipes and a conductive ground connection to the evaluation circuit, using a braided metallic shield and a large-area ground connection point to minimize interference and simplify installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the non-metallic pipe section is surrounded by coils and a metallic shielding housing is used, then electromagnetic interference from stray currents is reduced, but the installation complexity increases due to the need for electrical insulation and grounding connections
Solution Approach 1:
The patent introduces an insulating layer as an intermediary substance between the metal pipe flange and the shielding housing end plate. This insulating layer serves as a mediator that provides both electrical insulation to prevent stray current paths and mechanical support for the coil assembly, thereby reducing installation complexity while maintaining electromagnetic shielding effectiveness
Solution Approach 2:
The patent combines multiple functions into the insulating layer: electrical insulation, mechanical support, and potential grounding reference. By merging these functions into a single component, the patent reduces the number of separate parts needed and simplifies the installation process while maintaining the shielding against electromagnetic interference
2Stability of the object's composition
If metal pipe flanges are directly connected to the shielding housing, then structural stability is improved, but stray currents and electromagnetic interference increase
Solution Approach 1:
The insulating layer acts as an intermediary that breaks the direct electrical connection between the metal pipe flange and shielding housing while maintaining mechanical structural stability. This allows the system to retain both structural integrity and electromagnetic shielding properties without direct metal-to-metal contact
3Object-affected harmful factors
If a large-area ground connection point is used on the shielding housing, then electromagnetic interference suppression is improved, but the device complexity and material usage increase
Solution Approach 1:
The patent merges the ground connection function with the shielding housing structure itself by providing a large-area ground connection point directly on the housing surface. This integration eliminates the need for separate grounding components and simplifies the overall grounding system while maintaining effective electromagnetic interference suppression
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
This design effectively suppresses stray current interference, enhances measurement accuracy, and simplifies the installation process by providing a robust shielding system that reduces electromagnetic interference and ensures safe and efficient operation.
Implementation Method 1
a non-metallic pipe section (8) in the conveying path of the pipe conveyor system is surrounded by coils (5, 6, 5') with which the field changes caused by foreign matter in the conveyed material flow are detected
Implementation Method 2
the non-metallic pipe section is surrounded by a metallic shielding housing, which merges into the continuing metallic transport pipes of the pipe conveyor system
Implementation Method 3
metal pipe flanges with a flat contact surface against the shielding housing, through the interposition of a thin layer of insulating material, are electrically isolated on the two end plates of the shielding housing
Data Source
Figure 1~2
AI summary
The invention relates to a receiving device of an electromagnetically operating unit for determining foreign fractions in the material flow of a tubular delivery system, wherein a non-metal tube section (8) is surrounded by spools (5, 6, 5') in the delivery path (1, 3) of the tubular delivery system, wherein said spools are used to detect the field changes caused by foreign fractions in the delivery product flow and feed them to an evaluation circuit (7), and wherein furthermore said non-metal tube section (8) is enclosed by a metal shield housing (4), which transitions into the continuing metal transport tubes (3, 3') of the tubular delivery system, and wherein furthermore the shield housing (4) surrounding the non-metal tube section (8) and the spools (5, 6, 5') can be electrically insulated against the continuing metal transport tubes (3, 3') for the delivery product. Metal tube flanges (10), having a planar contact surface against the shield housing, are attached in an electrically insulating manner to both end plates (4') of the shield housing (4) enclosing the spools, with the interposition of an intermediate layer of a thin insulating material (9), and the thereby insulated shield housing (4) is connected to the ground point of the evaluation circuit (7) in an electrically conductive manner.