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A Method for Determining the Number of Screws Needed for a Circular Section Rubber Strip under Compression

A determination method and technology of rubber strips, which are used in the testing of mechanical parts, fluid tightness testing, and testing of machine/structural parts, etc., can solve the problem of reduced equipment sealing performance, unreasonable compression design, and improper selection of conductive rubber. Appropriateness and other issues to achieve the effect of high calculation accuracy

Active Publication Date: 2019-04-09
NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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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

Method used

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  • A Method for Determining the Number of Screws Needed for a Circular Section Rubber Strip under Compression
  • A Method for Determining the Number of Screws Needed for a Circular Section Rubber Strip under Compression
  • A Method for Determining the Number of Screws Needed for a Circular Section Rubber Strip under Compression

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[0060] In order to make the purpose, technical solutions and advantages of the present invention clearer, the implementation manners of the present invention will be further described in detail in conjunction with the accompanying drawings.

[0061] Step 1: convert the hardness of the circular cross-section rubber strip into the elastic modulus of the circular cross-section rubber strip; the process of the circular cross-section rubber strip being compressed and deformed is elastic deformation (without considering plastic deformation), and the suffered pressure is about The continuous function of the height of the circular section rubber strip; due to the particularity of the rubber material, it is much easier to measure its hardness than to measure its elastic modulus, so the manuals of various rubbers generally only mark the hardness of the rubber, which is often used in practical applications To elastic modulus, therefore need to know the relation of elastic modulus and hard...

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Abstract

The present invention proposes a calculation method for the compression deformation of circular cross-section rubber strips and the number of screws required considering the influence of plate shell stiffness, which involves the empirical fitting formula of rubber strip hardness and elastic modulus and the apparent elastic modulus of rubber Common techniques in computing and other fields. This method uses the assumption of the continuity of rubber deformation to deduce the pressure on the rubber after deformation, and then calculates the number of screws required for the rubber strip to achieve the required deformation, and then analyzes the rigidity of the chassis cover on the force of the rubber strip and the screws. Finally, according to the analysis results, the number of screws is corrected. The method adopts the method of combining qualitative and quantitative analysis, and the calculation is simple and accurate, and is especially suitable for electronic equipment with high requirements on 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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M13/00G01M13/005G01M3/00
CPCG01M3/00G01M13/005
Inventor 高驰名邢焰
Owner NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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