Isolated diaphragm of cement slurry densitometer and installation and replacement method

Abstract

The invention relates to an isolation diaphragm for a cement slurry densitometer and a method for assembling and replacing the isolation diaphragm, wherein a putty isolator is arranged between a measuring tube of the densitometer and a pressure gauge; the inside of the putty isolator is provided with a cavity which is filled with hydraulic oil; a supporting framework which is made of hard materials is coated on the peripheral edge of a flexible isolation diaphragm which is fixed inside an annular groove on a front opening of the cavity, and the flexible isolation diaphragm and the supporting framework are pressed into a whole by a die; and gaps are reserved between the outside of the isolation diaphragm and the annular groove, and are filled with cohesive glue. The isolation diaphragm for the cement slurry densitometer avoids corrosion and damage due to contact of the slurry and a hard sensor, and does not need to use a large-diameter sensor diaphragm to prevent transport damage and so on, thereby reducing the cost; the front surface of the diaphragm which is pressed by the die is natural and smooth and has stable performance, thereby guaranteeing accurate measurement; when the isolation diaphragm is assembled, people only need to fill the annular groove with the glue and press the whole diaphragm into the annular groove, and residual glue can be overflowed from the gaps on the outside of the diaphragm and fills in the gaps, so as to fix and seal the diaphragm; the isolation diaphragm is convenient to replace; a lug boss is arranged on the rear of the diaphragm, thereby being favorable for gluing and sealing; and the thickness, the diameter and so on of the diaphragm all realize transmission of hydraulic pressure, accurate measurement and difficult damage.

Description

[0001] (1) Technical field: The present invention relates to an isolation diaphragm of a cement slurry density meter and an installation and replacement method, belonging to the category of fluid pressure measurement (G01L). (two) background technology: [0002] The grouting project is a key basic project in the fields of water conservancy and hydropower, construction engineering, etc. In the grouting project, it is required to measure the density ρ of the grout to control the water-cement ratio. Traditional density measurement methods include: 1) Nuclear density method: the density of the slurry is measured by using the absorption of the γ-ray emitted by the nuclear radioactive source by the slurry. expensive. 2) Fixed-height liquid column pressure method: by measuring the pressure p generated by the slurry at a fixed height L, the slurry density ρ∞L×p can be obtained after conversion. The cement slurry density meter consists of a measuring tube and a pressure gauge connecte...

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Problems solved by technology

[0005] The isolation diaphragm of the cement slurry density meter provided by the present invention and the installation and replacement method, the first purpose is to be identical with the Chinese patent application 'putty separator for cement slurry density meter' (applica...

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