SU1408307A1 - Sleeve for determining gas-permeability of particulate materials - Google Patents

Abstract

The invention of Otosit to a monitoring measuring technique. The goal is to increase the expressness of the preparation of the test material and the accuracy of determining its gas permeability. The sleeve is made in the form of a cylindrical body in which disks with holes are mounted. One of them has a flat surface, and the other is convex. The thickness and radius R of the curvature of the surface of the circular disk are performed with certain parameters. The test material is poured into a sleeve on a convex disk, when the critical load is reached, a sharp cotton occurs on the latter — a rapid shaking of the dispersed material, as a result of which it is compacted. Next, the gas permeability is determined. I il. i (L

Description

CX)

with

The invention relates to measurement instrumentation and can be used in the foundry industry, in the mining industry, pharmacology, at the processing plants at sand pits, in powder metallurgy, and other areas for determining the gas permeability of dispersed materials as an indirect characteristic of the particle size distribution.

The aim of the invention is to increase the rapidity of preparation of the test material and the accuracy of determining its gas permeability.

The drawing shows a sleeve for determining the gas permeability of dispersed materials.

The sleeve is a cylindrical body made of lower 1 and upper 2 glasses, in which disks 3 and 4 are mounted in height, respectively. The disks have holes 5, the total area of which is selected so that these disks do not distort the laminar air flow passing through the material under test. Disk. 3 has a flat surface and is mounted in the upper part of the glass 2 into the removable clip 6, which prevents the test material from being ejected by the gas flow. The disk 4 is mounted between the cups I and 2 and is made of a convex shape directed toward the glass 2. Above the disks 3 and 4 grids 7 are fixed, the dimensions of the cells prevent penetration of particles of the test material 8 into the bottom glass 1. Thickness -1 of the lower disk 4 and radius The R curvatures of its surface are determined respectively from the expressions

t 4

{1 -E

and

. but

 5t

de a - the inner radius of the liner, cm; p - bulk density of the material, d

h is the distance between the upper and

lower disc liner, cm; E - the modulus of normal elasticity

bottom disk material, cr

ljj

g / cm -; C is the empirical coefficient,

0.08-0.09. The sleeve works as follows.

Q

five

0 5 0 Q

five

five

d

g

In the upper cup 2 of the liner, test material 8 is filled up with a known bulk density. At the moment when the load on the disk 4 reaches a critical value, there is a sharp cotton - a rapid increase in deformation. In this case, the test material 8 is compacted. After this, if necessary, a dozen of material is made into the sleeve. The sleeve is covered with a removable cover 6 and is mounted on a standard gas permeability measuring device. At the end of the test, the material is poured out and the disk 4 returns to its original position.

An example of calculating the thickness t of the disk 4 and the radius R of curvature over the surface is given for a liner, the casing of which is made of steel X18H9T, used to determine the gas pressure of quartz sand.

With an inner radius of the sleeve, 5. cm, the natural density of quartz sand J l, 5 g / cm, the distance between the upper and lower disks of the liner cm, the modulus of normal elasticity of steel X18H9T 10 g / cm and the empirical coefficient, 09 thickness of the lower disk 0 , 01 cm, and the radius of curvature of its surface is 150 cm.

Thus, the ratio of the radius, curvature of the lower disk, its thickness, the inner radius of the sleeve and the distance between the upper and lower disks is 30: 0.002: 0.5: 1.

Claims (1)

Invention Formula A sleeve for determining the gas permeability of dispersed materials, containing a cylindrical body with two disks placed at its height with a tolerance mi, which is so that, in order to increase the expressiveness of preparation of the test material and the accuracy of its gas permeability, one of the disks has a shape convex toward the other disk while its thickness and radius of curvature of the surface satisfy the conditions t and R tg, R a .- zit where t is the thickness of the disk, cm; a is the inner radius of the liner, cm; 5 - bulk density of the studied material, h is the stretch between the disks, cm; E - the modulus of normal elasticity hard disk material C is an empirical coefficient of 0.08-0.09; R is the radius of curvature of the disk, see