SU874212A2 - Sizing screen - Google Patents

Description

(54) DINING

I

The invention relates to a screening technique for minerals and can be used in the construction industry of mothers, ales, the mining industry and other branches of the national household.

According to the main author. St. No. 450600 is known for the grrhot, used in the screening of minerals. This screen contains a frame and a sieve noBepxHOCTbli made in the form of strings.

The strings along the entire length are closed by wear-resistant cylindrical sleeves with a convex-concave surface on the ends.

The disadvantage of the screen is the lack of operational reliability of the screen.

The purpose of the invention is to increase the operational reliability of the screen.

The goal is achieved by the fact that the end surfaces of the wear-resistant sleeves have recesses in which elastic sleeves are mounted with tension on the string.

The invention is illustrated by drawings 1, 2, 3, 4, 5, 6, 7.

FIG. 1 shows a string with wear-resistant sleeves, connected elastic sleeves, a cut; in fig. 2 - wear-resistant sleeve with grooves on the ends, a slit; in fig. 3 - the same, according to arrow B; - in fig. 4 shows section A-A in FIG. one; in fig. 5 is a section BB in FIG. one; in fig. 6 - elastic sleeve, slit; in fig. 7 - the same, top view.

In the description and in the drawings, the structure of the screen frame and the screening surface are not shown.

The screen contains a frame and strings 1 installed on it, having a polygon profile in section, on which wear-resistant sleeves 2 are installed. The end surfaces 3 and 4 of the sleeves are spherical and have depressions 5 and 6 in which elastic strings are placed on the strings 1 when mounting the sleeves 2 for example, rubber) bushings 7 with an axial channel 8, having a cross section of a polygon profile corresponding to the cross section profile of a string polygon, but smaller in area by an amount that provides tension when the sleeve is attached to the string. The profile of the external surface of the elastic sleeve is also made in the form of a polygon, which corresponds to the profile of the recesses 5 and 6 of the wear-resistant sleeve 2. The cross-sectional area of the elastic sleeve is smaller than the cross-sectional area of the recesses 5 and 6 of the wear-resistant sleeve 2 by the amount that ensures the elastic sleeve to freely enter the wear-resistant sleeve during installation and excluding the relative angular displacement of the string - elastic sleeve and wear-resistant sleeve when the screen is running.

The length of the elastic sleeve is equal to the sum of the lengths of the recesses 5 and 6.

The installation of elastic X and wear sleeves on a string is performed in the following sequence. One of the sides of the string is fixed, and bushings are alternately installed on the opposite side. A wear-resistant sleeve is installed, and then an elastic sleeve 7 is inserted into the recess 5 (or 6) on the string 1 with a tension, with a part of the sleeve protruding from the recess. The following wear-resistant sleeve 2 is installed on this protruding part of the elastic sleeve by a recess 6 (or 5), so that the outlet end of the wear-resistant sleeve coincides with the concave bargain of the next wear sleeve, and so on, until the whole string is attached and then fastened on the frame screening. At the same time, the wear-resistant bushings are spring loaded with a special device in order to eliminate the gap in the ends of the wear-resistant bushings. The sleeves are mounted in a similar manner to other strings of the rumble. As the sleeves 2 are worn, the strings turn, respectively, and the elastic and wear-resistant sleeves turn as they are structurally made without the possibility of angular displacement relative to each other. Channel 9 of the wear-resistant sleeve 2 can be made round (Fig. 3), or have a cross section profile corresponding to the cross section profile of the string, but have a larger cross-sectional area by an amount which prevents contact of the bushings with the string during operation.

During operation, pieces of material fall on wear-resistant sleeves and cause the strings to vibrate through elastic sleeves, which, respectively, pass vibrations to other wear-resistant sleeves through elastic sleeves. As already mentioned, the dimensions of the elastic sleeve, the recesses for them and the yoke resistant sleeves and channel 9 in BTyjHce 2 are chosen so that, when the string is vibrated, its contact with the inner walls of the channel 9 is eliminated. life time

strings.

The size of the radial movements of wear-resistant sleeves at the contact points of the ends will also significantly decrease, since this movement will be prevented

installed elastic sleeves, and this will reduce wear on the ends of the sleeves.

Elastic sleeves will also prevent penetration of the processed material into the space between the surface of the string and the inner wall of the channel.

9 sleeve 2 through the contact of the ends of wear-resistant sleeves, and this will certainly increase the service life of the strings.

Claims (1)

Invention Formula thirty Crash on auth. St. No. 450600, characterized in that, in order to increase the operational reliability of the screen, the end surfaces of the wear-resistant sleeves have - deepenings in which elastic sleeves are mounted with tension on the string. Sources of information taken into account in the examination 1. Copyright certificate. USSR № 450600, cl. B 07 B 1/12, 1972 (prototype). Fig.d F1 / g. FIG. five