SU368546A1 - SAMPLE ANALYZER OF GRAIN COMPOSITION - Google Patents

Description

one

The invention relates to the n-ore and other industries of the industry where the product is crushed or crushed, consisting of a mixture of grains of various sizes. An important characteristic of this product is the grain size distribution law, usually expressed as a curve of total residue on a sieve (in%) depending on the size of the sieve, called the grain composition curve (GLC).

In known analyzers, a sample of a product is usually dispersed on laboratory screens, representing a set of sieves, which are constituted in a common bag with up-and-down holes. The sieve pack is installed on a vibrating plate, vibrating the sieves to the sieves, ensuring that the sifting is carried out into fractions by size, the sieve nocvie sifting and disassembling, and each fraction is molded to obtain the weight of private residues on the sieves, after which the total residues on the sieves are determined by adding successively on higher ranks. The obtained weight values are expressed in% of the total weight of the sample and, based on the obtained values, the GLC is constructed.

This process is a very hard work.

The purpose of the invention is the mechanization and automatization of the processes of screening and unloading, reducing the time of unloading and the mechanization of the process of extrusion.

This is achieved by the fact that the casing of the screen with a set of ring screens is mounted on

vibroplatform, equipped with an oscillator in the form of displaced unbalances, creating reciprocating oscillations in the vertical plane and torsional vibrations around the vertical axis, the sieves being made in the form of a helical surface with spiral discharge pipes located above the hoppers of the device, the weighing device itself is made in the form of a platform with hinges tipping hoppers, separate for each fraction, mounted on the lever system, and the balance end of the scale lever The device is suspended on a tension beam with load cells attached to it.

FIG. 1 is a diagram of the screen with a weighing device in a vertical m section; in fig. 2 - hoppers of the weighing device in the section; in fig. 3 - sectional screen; in fig. 4 - vibrator, section along the axis.

The sample analyzer consists of a screen /, a vibrator 2, a weighing device, a device 3, and a measuring device, not shown in the figures.

GrOhot 1 consists of a cylindrical cylindrical body of 4, having several Russ sit 5 ring (in plan) form with spiral discharge nozzles 6. The screen is mounted on spring shock absorbers 7 and has a double-balanced vibrator 2 fixed to the bottom with offset balance 8.

The weighing device 3 consists of a platform 9 with bunkers 10 hinged on it, which can occupy two positions — working (shown as a flat line) and overturned (shown as a rim point). Platform 9 is reflected in the prisms of the lever system, which is usually used on decimal scales. The long arm 11 rests on the arm 12, equilibrating with the adjustable load 13 to the whole weighing system with platform 2 and the empty hoppers 10.

In addition, the lever 11 is suspended on the strainer 14 with the strain gauges 15 pasted on it, the resistances R and RZ of which vary depending on the load of the strainer 14. The strain gauge 15 (R and 2) is included in the o-meter scheme: to the measuring diagonal of which an analog galvanometer is connected. The bridge is powered from a DC source through a rheostat.

The link 16, which transmits the load from the scale lever to the strainer, has several fixed positions, which allows for a small sample mass to increase the strainer arm and itself: to increase the sensitivity of the measuring device.

The sample analyzer works as follows.

The sample is poured into the hopper hopper on the upper sieve and the engine of the vibrator 2 turns on in such a direction that the material is informed by a circular directional displacement along arrow E. E. This causes sieving of the material in a fraction of m. The spiral shape of the discharge nozzles 6 does not allow falling out through the x, x of the material being screened for a given direction of motion. When the sieving is completed, the vibrator motor is switched to the opposite side of rotation. The material is informed by a circular directional movement along the arrow F, while it, striving to press against the periphery, is fed into the nozzles 6. Each fraction through the trays 17 is poured into the corresponding

bunker 10. The total weight of all fractions is recorded with a measuring device galvanometer at the determined position of the rheostat slider. In order to express the total 5 residues on the sieves (in%), the rheostat slider is moved so that the instrument arrow is set to division 100. After that, the first bunker is tilted 10 s with a fraction passing through the bottom sieve with: minimum openings. The material is poured into the collecting bin 18, and the device is discharged; it indicates the total residue on the sieve with minimum openings (in%) of the total sample weight. Then hopper 10 is tilted and a residue is obtained on the second sieve, etc. The readings of the device are recorded visually or by self-cleaning devices.

| Based on ready-made digital data, the GLC is built. The proposed analyzer will find wide application in the crushing and screening plants of nonmetallic building materials, in the laboratories of research institutes that perform screen analyzes of granular materials.

Subject invention

Claims (2)

1. An analyzer of samples of the grain composition of a crushing product, including a screen with sets of sieves, a vibrator, and a weighing device, different from THAT, for the purpose of mechanization and automatization of screening and unloading processes, the frame of the screen with a set of annular sieves is mounted on a vibrating plate equipped with a vibrator displaced unbalances, creating reciprocating oscillations in the vertical plane and torsional oscillations around the vertical 0 axis, and the sieve is made in the form of a helical surface with a spiral discharge nozzles located above the hoppers of the weighing device. 2. The analyzer of claim 1, wherein 5, in order to reduce the discharge time screening and mechanization of the weighing process, the weighing device is made in the form of a platform with tilting bunkers separate for each fraction hinged on it, mounted on the lever system, and the balance arm end of the weighing device is mounted on the strain gauge with the strain gauges pasted on it. Fb / g 2 17