SU1077654A1 - Centrifugal classifier - Google Patents

Abstract

CENTRAL CLASSIFIER, including rotor, made in the form of a truncated cone, the screening surface of which consists of strings, divider fractions, loading and unloading devices, from which it is designed to increase the efficiency of the process of material separation due to uniform string tension,. The classifier is equipped with weights that are fixed and fixed by means of hinges on a larger base of a truncated cone, the strings being connected with the ends only with the weights. Iw

Description

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The invention relates to devices for separating bulk materials into fractions depending on their geometrical dimensions, namely, a centrifugal classifier, and can be used, for example, in agriculture for grain sorting, in the cement and chemical industry for sorting granules according to their dimensions.

A centrifugal classifier is known, the inclusions rotor, in which the screening surface is made in the form of a truncated cone and represents strings fixed between the lateral and smaller bases of the cone, the studs with nuts and the disk to which the smaller base is attached. The strings between the bases are tightened with the help of nuts located on Сl3 studs.

The disadvantage of this classifier is the impossibility of a uniform tension of the strings, since several strings simultaneously pull with one pin.

Closest to the invention in its technical essence and the effect achieved is a centrifugal classifier comprising a rotor made in the form of a truncated cone, the screening surface of which consists of strings 2.

The disadvantage of such a classifier is the low efficiency of the material separation process due to the absence of uniform tension on the strings.

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The aim of the invention is to increase the efficiency of the material separation process due to the uniform tension of the strings.

This goal is achieved by the fact that in a centrifugal classifier, including a rotor, made in the form of a truncated cone, the screening surface of which consists of strings, fraction dividers, loading and unloading devices, is equipped with weights installed and fixed by means of hinges on a larger base of a truncated cone. one ends associated with weights.

Fig. 1 shows a centrifugal classifier, a section along the axis of rotation of the rotor; figure 2 - node I in figure 1; FIG. 3 is a kinematic string tensioning scheme.

The centrifugal classifier contains a rotor 1, made in the form of a truncated cone, the screening surface of which is formed by the strings 2. Some ends of the strings 2 are fixed on a smaller base 3 of the cone, and others on the weights 4, and perhaps as a hinged strings attachment

to loads 4 (if the string itself is rigid) and rigid (if the string is flexible). The loads 4, in turn, are fixed on a larger base 5 of the cone by means of the hinge b and are made such that the shoulder D of the centrifugal force F applied in the center of the weight plate A of the load is larger than the shoulder S of the tension of the string Q. The larger base of the cone 5 is made in the form of a rim with

knitting needles, smaller base 3 - in the form of scattering plates. The shaft 7 of the rotor 1 rotates from the drive 8. And consists of two parts, with the top. n part of the shaft floor with holes

5 to feed the material to the spreading plate 3 and serves to feed the material into the classifier, and the lower part of the shaft is installed in bearings 9. The classifier also contains movable dividers of fractions 10,

11 and collections of fractions 12-14, having a common sloping bottom 15 and grain growers 16-18.

The centrifugal classifier works as follows.

The drive 8 is turned on. When the rotor 1 rotates, the loads 4 are affected by the centrifugal force F, which creates a moment that tends to turn the load

0 around the hinge 6. This moment is balanced by the force of tension of the jet

Q, which is equal to Q P: g. At steady rotation of the rotor 1 through the cutting of the upper hollow part of the rotary shaft 7, the source material is fed to the spreading plate 3. Under the action of centrifugal force, the material is distributed over the entire surface of the plate and is moved to the weights 4. Due to the vertical component of the centrifugal force, the particles of the material move along the strings upward along the sieving surface. As the size of the holes between the strings increases from the smaller base 3 of the screening surface to the larger base 5, material particles are successively released, starting with

small ones. The screened particles are divided by dividers 10 and 11 into several fractions, which accumulate in collections 12-14 and are removed

5 through grain growers 16-18 from the classifier. The retraction fraction is withdrawn through the larger base 5 of the cone.

Fastening at the ends of the strings from the side of the larger base of the cone

0 weights allows to achieve a uniform tension of the strings, which leads to an increase in the efficiency of the separation process and the quality of the separation of the material. Hinging cargo on a larger base of the cone and

performing weights such that the shoulder from the direction of the centrifugal force to the axis of rotation of the weight is greater than the shoulder from the direction of the force of tension of the string to the specified axis, allows you to achieve the necessary constant and uniform tension of the string with a minimum weight of the goods. In addition, when foreign objects hit the sifting surface and dynamic strikes of the strings, the latter are diverted due to hinge fixation, which eliminates the breakage of the strings and allows to increase the reliability of the device.

Claims (1)

CENTRIFUGAL CLASSIFIER, including a rotor made in the form of a truncated cone, the screening surface of which consists of strings, a fraction divider, loading and unloading devices, so that in order to increase the efficiency of the material separation process due to the uniform tension of the strings, the Classifier is equipped with weights fixed and secured by hinges on the larger base of the truncated cone, the strings being connected at one end to the weights.