Rolling Contact Tubes for Microwave Press Shielding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing double-belt heating presses face issues with mechanical wear in their radiation shielding, leading to potential arcing and reduced effectiveness in preventing microwave radiation leakage, especially when combustible materials are present, due to contact strips that can lift off and create gaps.
Innovation Solution
The use of electrically conductive contact tubes with convex surfaces that roll gap-free between support tubes, ensuring a permanent, wear-resistant shielding with no air gaps and reduced potential differences, combined with a support shaft and elastic casing for stability and radiation-tightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If contact strips are used for shielding between support tubes, then radiation-tight shielding is achieved, but mechanical wear causes contact lugs to lift off creating gaps and arcs
Solution Approach 1:
The patent replaces the sliding contact mechanism with a rolling contact mechanism. Contact tubes with outer diameter slightly larger than the spacing between support tubes are pressed against the support tubes, creating rolling contact instead of sliding contact. This substitution dramatically reduces mechanical wear while maintaining continuous electrical contact for radiation shielding.
Solution Approach 2:
Instead of having flat contact strips that slide along the support tubes, the invention uses cylindrical contact tubes that roll between the support tubes. This inversion of the contact geometry from planar to cylindrical enables the rolling motion that eliminates wear while maintaining continuous contact.
2Object-affected harmful factors
If contact strips are used for shielding, then radiation containment is provided, but arcs can occur due to gaps and mechanical wear
Solution Approach 1:
By replacing sliding contacts with rolling contacts, the invention eliminates the mechanical wear that leads to gap formation. The continuous rolling contact ensures uninterrupted electrical connectivity between support tubes, preventing arcs and the associated ignition hazard while maintaining radiation containment.
Solution Approach 2:
The invention changes the contact geometry parameter from flat strips to cylindrical tubes with specific diameter relationships. The contact tube outer diameter is designed to be slightly larger than the spacing between support tubes, ensuring constant pressure and continuous electrical contact without gaps that could lead to arcing.
3Reliability
If contact tubes with larger outer diameter are used, then gap-free shielding is achieved, but rolling friction is introduced
Solution Approach 1:
The patent substitutes sliding friction with rolling friction by using cylindrical contact tubes that roll between support tubes. Although rolling friction is introduced, it is significantly lower than sliding friction, and the benefit of gap-free continuous shielding outweighs this minor energy loss.
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 solution provides a durable and effective shielding against microwave radiation, preventing arcing and ensuring complete containment, while enhancing heat generation performance through reflection properties and eliminating risks of ignition from combustible materials.
Implementation Method 1
the contact tubes, like the support tubes, having a metallic surface or being made entirely of metal in order to be able to reflect incident microwave radiation
Implementation Method 2
a plurality of support tubes are arranged horizontally adjacent in a roller table, with a parallel longitudinal microwave antenna being arranged in every second space between the support rollers
Implementation Method 3
between which the workpieces are subjected to pressure and microwave energy from the microwave antennas to heat and harden aqueous adhesive
Data Source
AI summary
A known double-belt heating press (1) with upper and lower press tables designed as roller tables (3) with support rollers (2) for support tubes (7) mounted transversely to the transport direction (20) of workpieces (6), on which microwave-permeable conveyor belts (5) roll and with rod-shaped microwave antennas (4) arranged parallel between adjacent support tubes (7) of a roller table (3) and with a radiation-tight and electrically conductive bridging of the gaps between the support tubes (7) by means of a shield, is optimized in such a way that a permanently effective and low-wear shielding of the microwave radiation can be achieved, which is achieved by the shielding consisting of electrically conductive contact tubes (8) or equipped with such electrically conductive surfaces, which are mounted without gaps between each pair of adjacent support tubes (7), rolling on them.