Adjustable test piece cylinder rear plate

Abstract

The invention provides an adjustable test piece cylinder rear plate, and particularly relates to the field of feed production devices. The adjustable test piece cylinder rear plate comprises a bottomplate and a cylindrical impedance tube; the bottom plate is provided with a sealing column; the two sides of the sealing column are provided with a first clamping plate and a second clamping plate respectively, and the end parts of the first clamping plate and the second clamping plate are connected with the bottom plate; the sealing column is embedded into the impedance tube; and the side walls of the impedance tube is located between the first clamping plate and the sealing column and between the second clamping plate and the sealing column. According to the invention, the problems of air tightness and fixation caused by axially pushing the test piece cylinder rear plate can be solved.

Description

technical field [0001] The invention belongs to the field of feed production devices, and in particular relates to an adjustable rear plate of a test piece cylinder. Background technique [0002] The rear plate of the specimen cylinder is an indispensable and important component in the noise impedance tube. Impedance tube is a device used to measure the vertical incidence sound absorption coefficient of sound-absorbing materials. Its main body is a rectangular (square) or circular cross-section tube in a rigid wall. One end of the tube is equipped with a sound source; A moving probe microphone or two fixed-position microphones; the other end is reserved for installing the test piece. When inserting the test piece axially into the tube, the impedance tube needs to be sealed with the back plate of the test piece tube and fixed on the impedance tube. superior. This new type of adjustable rear plate of the specimen cylinder is mainly suitable for impedance tubes or other close...

AI Technical Summary

Problems solved by technology

This change makes it difficult to implement the design proposal of the rectangular impedance tube in the standard, which will greatly increase the processing difficulty of the square impedance tube, or increase the production cost of the impedance tube, which is not conducive to the integral molding of the square tube and affects the straightness of the tube wall The processing of the movable cover window will also affect the flatness of the inner wall of the impedance tube

The method of axially pushing the test piece does not need to open windows on the side wall of the impedance tube, and also avoids the sealing problem of the movable cover plate, which can better avoid the processing difficulty and cost problems of the traditional process of small-sized square impedance tubes, but It is still necessary to solve the problems of airtightness caused by axially pushing the rear plate of the test piece cylinder

[0004] In view of the above deficiencies, an adjustable rear plate of the specimen cylinder is needed, which can solve the problems of air tightness and fixation caused by axially pushing the rear plate of the specimen cylinder.

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