Method for determining number of required screws of circular-cross-section rubber strip in compressed state

Abstract

The invention provides a method for calculating compression deformation of a circular-cross-section rubber strip and number of required screws in a manner that effect of shell rigidity is considered, wherein the method relates to an empirical fitting formula between rubber strip hardness and elastic modulus and common techniques in the fields such as rubber apparent elastic modulus. According to the method, a bear pressure after rubber deformation is derived by means of continuity assumption in rubber deformation; furthermore the number of required screws for obtaining the required deformation amount of the rubber strip is calculated; then an influence of housing cover plate rigidity to force bearing of the rubber strip and screw distribution is analyzed; and finally the number of the screws is corrected according to the analysis result. According to the method, a manner of combining qualitative analysis and quantitative analysis is utilized. Simple calculation and high accuracy are realized. The method is particularly suitable for electronic equipment with relatively high requirement for sealing performance and electromagnetic compatibility.

Description

technical field [0001] The invention relates to an electronic device sealed with a conductive rubber strip that has sealing and electromagnetic compatibility requirements in the field of communication measurement and control. It is especially suitable for the determination method of the number of screws required for the circular cross-section rubber strip in the compressed state in electronic equipment that requires high sealing performance. Background technique [0002] In the current sealing structure design of electronic equipment, the form of conductive rubber seal is mainly used. Conductive rubber has similar properties to ordinary rubber. The selection and use of conductive rubber is generally based on experience, especially for the pressure-bearing surface in contact with the cover plate. There is no suitable calculation method for rubber strips with changing circular cross-sections. There are often phenomena such as inappropriate selection of conductive rubber, unrea...

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Problems solved by technology

[0002] In the current sealing structure design of electronic equipment, the form of conductive rubber seal is mainly used. Conductive rubber has similar properties to ordinary rubber. The selection and use of conductive rubber is generally based on experience, especially for the pressure-bearing surface in contact with the cover plate. There is no suitable calculation method for rubber strips with changing circular cross-sections. There are often phenomena such as inappropriate selection of conductive rubber, unreasonable selection of screw specifications and quantities, unreasonable design of compression, and incorrect installation methods, etc., resulting in equipment sealing. Reduced performance or even failure

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