SU1256785A1 - Classifier - Google Patents

Description

one

The invention relates to the enrichment of minerals, primarily for the separation of sludge by size, and can be used in the construction, chemical and silicate industries,

The purpose of the invention is to increase the service life of the sieve and the performance of the classifier due to uniform wear of the sieve.

Figure 1 shows the classifier, a longitudinal section; figure 2 - the same, when lowering the screw surface on magnitudeN; on fig.Z - section

A-A in FIG. I1.

The classifier includes a housing 1, inside which a cylindrical sieve 2, arranged in the form of vertically arranged grates 3, and a screw surface A. are mounted coaxially.

A receiving cup 5 is mounted on top of the housing 1 with a charging nozzle 6 having a shutter 7 for controlling the amount of sludge entering the classifier. At the bottom of the case are discharging nozzles 8 and 9, respectively, for the removal of small and coarse fractions. Between the discharge pipe 9 and the cylindrical sieve 2 an additional glass 10 is installed, the height of which is equal to the pitch of the screw surface 4, and the internal diameter is equal to the internal diameter of the sieve. The shank 13 of the screw guide 4 is rigidly connected to the nut 14, finished. A flywheel 15. The screw guide 4 has a restrictive plate 16. Between the housing 1 and the cylindrical sieve 2 there is an annular cavity 17. The screw 12 is divided by 30 ° along its perimeter and the nut 14 is provided with an arrow (not shown).

Classifier works as follows.

Cement-raw material psham (or any other pulp) under pressure at a certain rate is fed through

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20

25

2567852

The loading nozzle 6 into the receiving cup 5 and onto the helical surface 4. Under the action of centrifugal forces, the pulp, moving along the helical direction, presses against the sieve 2 and is classified through the grate. The classification products are discharged through the discharge ports 8 and 9. The friction forces arising between the screw 12 and the nut 14 hold the screw surface stationary relative to the sieve (position in FIG. 3). Periodically (once per shift) the handwheel 15 is turned at a certain angle (for example, 60) and the screw surface 4 is rotated through this angle and lowered along the screen by an amount h. Lowering occurs by screwing the nut 14 onto the screw 12. At that, the place of contact of the pulp with the sieve is displaced along its height and perimeter (Fig. 3, position P). The magnitude of the screwing of the nut 14 is equal to the height of the additional glass and corresponds to the tag of the screw surface; the amount of contact between the pulp and the sieve along its height moves by this value. The height of the additional glass is equal to the step of the screw surface 4. Since at the height of the glass more than a step, there will be a repetition of the places of contact of the pulp with the sieve and the subsequent coil nap. It will repeat the path of the preceding turn. When the height of the glass is smaller, the sieve surface will not be fully utilized when moving the contact point of the pulp with the sieve along its height. After the helical guide is fully lowered, it is raised by turning the handwheel in the opposite direction by an angle different from the angle of rotation when lowering. The angles are counted by dividing the screw 12 with the pointer on the nut 14. The plate 16 limits the movement of the screw guide up. Having completed the climb,. the cycle is repeated with changing angles of rotation.

thirty

35

40

45

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Claims (2)

1. A CLASSIFIER for dividing the pulp into fractions, including a housing inside which a vertical cylindrical sieve and screw surface are coaxially mounted; a receiving cup with a loading nozzle and discharge nozzles for separation products, characterized in that, in order to increase the performance of the classifier due to uniform wear of the sieve , the classifier is equipped with a mechanism for vertical movement and rotation around the axis, while an additional stack is installed between the sieve and the discharge pipe of large friction N same inner diameter with a sieve. 2. The classifier according to claim 1, about l and F, characterized in that the height of the additional glass is equal to the pitch of the helical guide. SU .. „1256785