Explosion-Proof Housing Adhesive-Free Connection via Melted Plastic Interlock
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing explosion-proof housings face challenges in achieving a simple, reliable, and cost-effective connection between metallic and plastic components without the use of adhesives, while ensuring high connection stability and meeting explosion protection requirements.
Innovation Solution
The connection between the metallic housing part and the transparent plastic cover part is achieved through interlocking depressions and projections, where the cover part's edge is partially melted to flow into the depressions, forming projections that create a stable, adhesive-free connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive is used to connect housing part and cover part, then connection stability is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent replaces the chemical bonding mechanism of adhesives with a thermal-mechanical bonding mechanism. The cover part edge is heated to melt the plastic material, which then flows into and fills the depressions in the housing part. Upon cooling, the material solidifies to form a mechanical interlock. This substitution eliminates the need for separate adhesive materials and application processes, reducing device complexity while maintaining connection stability.
Solution Approach 2:
The patent utilizes changes in the physical state of the plastic material through temperature control. By heating the cover part edge above the melting point of the plastic, the material transitions from solid to molten state, enabling it to flow and fill the depressions. Upon cooling, it returns to solid state, creating a strong mechanical bond. This parameter change approach replaces complex adhesive systems with a controllable thermal process.
2Reliability
If traditional connection methods are used, then manufacturing reliability is improved, but productivity decreases
Solution Approach 1:
The patent combines multiple operations into a single integrated process. The heating, melting, flowing, and bonding operations are performed in one continuous sequence without requiring separate adhesive application, positioning, and curing steps. This merging of operations maintains connection reliability while significantly improving assembly speed and productivity.
Solution Approach 2:
The cover part material serves multiple functions: it provides structural coverage and simultaneously acts as the bonding agent through its own melting and solidification properties. The material self-bonds to the housing part through the thermal-mechanical interlocking process, eliminating the need for separate adhesive materials and simplifying the manufacturing process.
3Strength
If adhesive-based connection is used, then connection stability is improved, but cost of manufacture increases
Solution Approach 1:
The patent eliminates the need for expensive adhesive materials by using the cover part's own plastic material as the bonding medium. The plastic material that would otherwise be wasted or require additional processing is instead utilized to create the bonding connection, reducing material costs and simplifying the manufacturing process.
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 method allows for a secure, quick, and inexpensive assembly of explosion-proof housings with high connection stability, independent of adhesive properties and material expansion issues, ensuring reliable explosion protection and visibility of indicator lights through the transparent cover.
Implementation Method 1
the edge of the lid melts at least partially as a result of this heating and material of the edge of the lid flows into the depressions, forming the projections
Implementation Method 2
For example, the laser can then also be used to heat the support edge
Data Source
Figure 1~3
Figure 4~5
Figure 6
AI summary
The invention relates to an explosion-proof housing and to a method for connecting a housing part and a cover part. The housing is made at least of a metal housing part with at least one housing opening and/or a receiving surface and a support edge which borders said housing opening and/or receiving surface and with a cover part which covers the housing opening or receiving surface and comprises a peripheral cover edge. The cover part and the housing part are connected together in an explosion-proof manner. The aim of the invention is to improve such a housing such that a corresponding connection of the housing part and the cover part can be produced in a simple and secure manner without adhesives in order to form an explosion-proof housing and such that the housing part and the cover part have a high degree of connection stability. This is achieved in that a plurality of connection points between the support edge and the cover edge are formed as depressions and protrusions which engage into one another, wherein the protrusions are formed by partially melting the cover edge.