One-Piece Inductive Sensor Housing for Shear Force Durability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional inductive proximity sensors have a weak structural construction due to their two-piece design, which makes them prone to breakage from contact with objects and debris, leading to frequent replacements and costly downtime in manufacturing processes.
Innovation Solution
A one-piece metal Exterior Housing with a thick casing and small interior diameter is used to enhance structural rigidity and durability, allowing the sensor to withstand higher shear forces and reduce the need for frequent replacements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a two-piece construction with a non-metallic sensing face cover is used, then the sensing range is improved and the sensing face durability is enhanced, but the structural strength and resistance to breakage are reduced
Solution Approach 1:
The patent merges the housing and sensing face into a single integrated one-piece metallic construction, eliminating the two-piece design. This integration maintains structural strength while the metallic face provides sufficient durability for industrial applications without requiring a separate non-metallic cover that would compromise structural integrity.
Solution Approach 2:
The patent changes the material parameter of the sensing face from non-metallic to metallic, and modifies the geometric parameter by eliminating the separate cover structure. This parameter change maintains structural strength while providing adequate durability through the inherent properties of the metallic construction and its geometric design.
2Reliability
If the interior diameter of the housing is increased to accommodate a larger sensor coil, then the sensing range is improved, but the structural rigidity and resistance to impact are reduced
Solution Approach 1:
The patent optimizes the geometric parameters by using a smaller interior diameter that provides adequate structural rigidity while accommodating a sensor coil size that delivers sufficient sensing range for industrial applications. The parameter optimization finds the optimal balance point where structural strength is maintained without unnecessarily sacrificing sensing capability.
3Reliability
If a recessed sensing face design is used, then contact protection is improved, but the structural construction is weakened compared to an all-metal one-piece construction
Solution Approach 1:
Instead of recessing the sensing face to protect it, the patent inverts the approach by making the sensing face the robust metallic surface itself and relying on the overall one-piece construction and appropriate mounting to provide protection. This inversion maintains structural integrity while providing sufficient contact protection through the inherent strength of the metallic construction.
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 design significantly increases the sensor's ability to withstand impact and shear forces, extending its operational lifespan and reducing maintenance costs by allowing it to withstand double to seven times more shear force than traditional sensors, as confirmed by independent lab testing.
Implementation Method 1
the sensor generates a magnetic field emanating from the active sensing face
Implementation Method 2
As a metal object enters into the range of the proximity sensor, the magnetic field is disrupted, and this disruption to the magnetic field is detected by the sensing circuit
Data Source
AI summary
Inductive Proximity Sensors are non-contact sensing devices used in manufacturing processes to sense metal targets. In practice, it is common for objects to contact the sensor causing the sensor to malfunction. An inductive sensor with improved durability is required. An inductive proximity sensor includes an exterior housing, an interior sensing coil and electronic circuit, and a connector. The Exterior housing is produced from one piece of metal bar, bored from one end to the tip of the other end, leaving the cylindrical tube open only on one end. The Exterior Housing is produced with an Inside Dimension that is smaller than previous proximity sensors and places the coil and electronic circuit further away from the Outside Dimension of the Exterior Housing. The interior sensing coil and electronic circuit are protected by the thick casing of the Exterior housing to improve structural rigidity and the longevity of operation in manufacturing processes. The design of the Exterior Housing has the ability to withstand extreme shear forces from contact abuse.