RU2655688C1 - Sieving device - Google Patents

Abstract

FIELD: technological processes.

SUBSTANCE: invention relates to the equipment for the bulk materials separation by size and can be used in construction, mining, metallurgy and other industries. Screening device comprises a sieve mounted in a casing with an inclination including a frame with tensioned strings forming a sieving surface, strings attachment elements, tensioning devices and the gap between the strings adjusting mechanism. Frame is made in the form of two adjacent hinged parallelograms with common longitudinal strip. Gap adjusting mechanism is made in the form of a helical gear, which screw is mounted on the frame with the possibility of rotation and is located on one straight line with a common longitudinal strip, and the nut is interfaced with the adjacent hinged parallelograms transverse strips by means of two connecting side rods diametrically opposite connected to its surface. Frame transverse strips are made with a bend in the opposite direction from the sieving surface, and the combs with the equidistant grooves are fixed thereon with the possibility of placing strings therein. Sieve is equipped with unloading spouts, made in the form of plates mounted above the frame lower transverse strips, by the upper edge adjacent to the combs not higher than the screening surface level. Sieve is provided with a divider installed above the adjacent hinged parallelograms common longitudinal strip and made in the form of a profiled angle member facing upwards by the corner. Device is provided with plates for limiting the flow of material, the two upper ones are mounted on the casing inner side walls opposing each other at an angle to the sieving surface, and the two lower ones are fixed on the frame side longitudinal strips with the possibility of placing their upper edges in the angular gaps between the upper plates and the casing. Sieve is installed in the casing in the guides, with the possibility of moving out of the casing. Sieve inclination angle to the horizon is 50–70°. Casing is provided with L-section front swing doors, which hinges are arranged vertically on the casing side walls. In the casing upper end a hatch with a hinged cap is made, commensurate with the sieve width. Casing is equipped with the aspiration nozzle.

EFFECT: production of the minus material various fractions, simplicity of design, low metal consumption and high operational reliability.

10 cl, 10 dwg

Description

FIELD OF THE INVENTION

The invention relates to equipment for the separation of bulk materials by size and can be used in the construction, mining, metallurgical and other industries.

State of the art

A string sieve is known from the prior art (see copyright certificate SU 1045952, IPC: B07B 1/04, published 07.10.1982), including a frame, a screening surface in the form of strings with a tensioner, transverse combs and a device for attaching strings in the form of rollers mounted on traverses with the possibility of rotation. Due to the fact that the grooves in the transverse combs are made of variable depth, and the tensioner is in the form of an even bar across the sieve, the strings have an alternating tension along the width of the sieve and, therefore, a different vibration amplitude. Such a structural embodiment of the string sieve allows to increase its productivity by improving the self-cleaning of the screening surface.

The disadvantage of the sieve is the sticking and accumulation of small material on the fastening elements, leading to a decrease in the living cross section of the screening surface. In addition, the design of the sieve does not provide for the adjustment of the distance between the strings, it does not allow changing the size of the fractions of the sifted material, which leads to a decrease in its functionality.

The Stryukov sieve is known (see certificate for utility model RU 25701, IPC: B07B 1/12, published on October 20, 2002), including side and load-bearing walls pivotally connected to each other in the corners, and parallel grates between them. The sieve has a simple design and allows you to change the distance between the grate with their constant (constant) length.

The design drawback is the impossibility of eliminating the sticking of wet material on the grate, made in the form of metal U-shaped staples that do not have the ability to vibration and self-cleaning.

The closest analogue to the presence of signs similar to the essential features of the proposed technical solution is a string sieve, disclosed in the article: Schlegel I.F. et al. String sieve ШЛ-316 // Builds. Materials, 2002, No. 4, p. 18-19. The sieve contains a fixed frame, which is the base, and with its connecting elements is mounted in the casing at an angle of 50-70 °. Inside the first frame there is a second frame connected to it by a special regulating device, ensuring its plane-parallel movement relative to the first frame. Strings are taut and fixed on both frames. The sifting on the string sieve is due to the vibration of the strings arising under the influence of the material falling on them. The clearance between the strings is adjusted by means of a control device that changes the distance between the surfaces of the strings of both frames.

The disadvantage of the prototype is the bulkiness of the design. In addition, the plate that protects the fastening elements of the strings from material falling onto them is laid on the strings from above, and the edge serves as a kind of barrier preventing unhindered descent of the oversize product and contributing to the growth of material on the screening surface, leading to a decrease in its working area and lower sieve productivity.

Disclosure of invention

The claimed invention solves the problem of creating a device designed for the separation of bulk materials by size, which allows to obtain various fractions of the sublattice product, and having a simple design, low metal consumption and high operational reliability.

The technical result is achieved due to the fact that in a screening device containing a sieve installed in the casing with an inclination, including a frame with tensioned strings forming a screening surface, string fastening elements, tensioning devices and a mechanism for adjusting the gap between the strings, according to the invention, the frame is made in the form of two adjacent articulated parallelograms with a common longitudinal bar and the clearance adjustment mechanism is made in the form of a helical gear, the screw of which is mounted on the frame with the possibility of rotation and It is located on one straight line with a common longitudinal bar, and the nut is mated with the transverse bars of adjacent articulated parallelograms by means of two connecting rods diametrically opposed to its surface.

Unlike the prototype, in which the sieve, which allows you to adjust the gap between the strings, has two frames, in the inventive device there is one hinged frame with the same working area of the screening surface. In addition, the tension forces of the strings are summed up and with a large number of them represent significant values. The separation of the screening surface into two parts allows to halve the load on the transverse bars and hinges and balance the lateral components of the load from the tensile forces.

In addition, the mechanism for adjusting the gap between the strings, made in the form of a helical gear, is simple and reliable in operation.

Thus, the proposed screening device has a simple and reliable design, ensuring its uninterrupted operation, as well as low metal consumption.

Since the transverse trims of the frame are folded to the opposite side from the screening surface and combs are fixed on them with grooves equally spaced from each other with the possibility of strings being placed in them, it became possible to remove the fasteners and tensioning devices of the strings from the working area and prevent material from entering them. The grooves of the comb reliably hold the strings from lateral displacement during operation of the device and readjustment of the sieve.

In addition, the sieve is equipped with estruses made in the form of plates mounted above the lower transverse frames of the frame, with the upper edge adjacent to the combs no higher than the level of the screening surface, which is aimed at eliminating the possibility of sticking and accumulation of small material on the string fastening elements, and also contributes to an unimpeded flow material from the screening surface, preventing its overgrowing, leading to a decrease in the performance of the sieve.

To prevent spillage of material between the two halves of the frame and in order to prevent material from sticking to the hinges, the sieve is equipped with a divider installed above the common longitudinal strip of adjacent articulated parallelograms and made in the form of a profile corner, with its apex facing up.

In the particular case of the implementation of the claimed invention, the device is equipped with plates to limit the flow of material, the two upper ones are mounted on the inner side walls of the casing opposite to each other at an angle to the screening surface, and the two lower ones are mounted on the side longitudinal strips of the frame with the possibility of arranging their upper edges in the corner the gaps between the upper plates and the casing. The plates form a directed flow of material directly to the screening surface and prevent spillage of material from the sides of the sieve frame, which is aimed at improving the reliability of the device.

It is preferable to install the sieve at an angle of inclination to the horizon of 50-70 °, providing the optimal rate of descent of the material from the screening surface at the same time with high efficiency of its separation into fractions.

It is advisable to provide the casing with front swing doors of an L-shaped section, the hinges of which are located vertically on the side walls of the casing. With the doors of the claimed design open, the most unhindered access to the service sieve is ensured.

Installing the sieve in the rails and the presence in the upper end of the hatch of the hatch with a folding hood commensurate with the width of the sieve, reduce the complexity of installation and dismantling work and increase the convenience of operation during readjustment of the sieve. A hinged cover covers the protruding part of the mechanism for adjusting the gap between the strings and provides access to the adjusting screw of the mechanism.

To remove dusty air, the casing is equipped with an aspiration pipe.

Brief Description of the Drawings

The essence of the proposed technical solution is illustrated by drawings, which depict:

in FIG. 1 - the claimed device, a longitudinal section;

in FIG. 2 - sieve unfolded, kinematic diagram;

in FIG. 3 - folded sieve, kinematic diagram;

in FIG. 4 is a view A in FIG. one;

in FIG. 5 is a section BB in FIG. four;

in FIG. 6 is a view B in FIG. 5;

in FIG. 7 - the inventive device, a cross section, the sieve is laid out;

in FIG. 8 - the same, the sieve is folded;

in FIG. 9 - the claimed device, side view;

in FIG. 10 - the claimed device, front view, the doors are open, the hinged cap is open.

The implementation of the invention

The screening device comprises a sieve 2 installed in the casing 1 with an inclination, including a frame with tensioned strings 3 forming a screening surface, string fastening elements 4, tensioning devices 5 and a clearance adjustment mechanism 6 between the strings. The frame is made in the form of two adjacent articulated parallelograms with a common longitudinal bar 7. The clearance adjustment mechanism 6 is made in the form of a helical gear, the screw 8 of which is mounted on the frame with the possibility of rotation and is located on one straight line with the common longitudinal bar 7, and the nut 9 is interfaced with the transverse strips 10 adjacent articulated parallelograms by means of two connecting rods 11, diametrically opposed to its surface.

The fastening elements of the strings 4 are made in the form of clamping screws and are located on the lower transverse trims of the frame. Tensioning devices 5 are made in the form of pegs and are located on the upper transverse bars.

The transverse strips 10 of the frame are bent to the opposite side from the screening surface, and combs 12 are fixed on them with grooves equally spaced from each other with the possibility of arranging strings in them. Over the lower transverse slats of the frame mounted estrus 13, made in the form of plates adjacent the top edge to the combs 12 not higher than the level of the screening surface.

Above the common longitudinal bar 7 of adjacent articulated parallelograms, a divider 14 is installed, made in the form of a profile corner, with its apex facing up.

The device is equipped with plates 15 to restrict the flow of material, the two upper ones are mounted on the inner side walls of the casing 1 opposite to each other at an angle to the screening surface, and the two lower ones are mounted on the side longitudinal strips of the frame with the possibility of arranging their upper edges in the corner gaps between the upper plates and casing.

The sieve 2 is installed in the casing 1 in the guides 16 at an angle of inclination to the horizon α of 60 °.

The casing of the device is equipped with a loading pipe 17, two discharge funnels 18, 19 and an aspiration pipe 20.

On the front of the casing, swing doors 21 of a L-shaped section are made, the hinges 22 of which are located vertically on its side walls.

In the upper end of the casing 1 there is a hatch with a hinged cap 23, commensurate with the width of the sieve 2.

The device operates as follows.

Through the loading pipe 17, the material to be screened falls onto the sieve 2, causing vibrations of the strings 3. Due to repeated bounces and falls of the material, intense sieving of small fractions occurs. The material passing through the sieve enters the production through the discharge funnel 18, and the lumps of material are rolled along the string grooves of the screening surface and sent through the discharge funnel 19 to the screenings. Dusty air is removed through the suction pipe 20.

The change in the size of the sifted material fraction is carried out by the mechanism for adjusting the gap 6 between the strings. When turning the screw 8, the nut 9 approaches the frame, the connecting rods 11 press on the transverse bars 10, the hinged parallelograms are folded and the gap between the strings decreases.

The use of the inventive device in existing production lines will optimize the particle size distribution of the sieve product and reduce the cost of acquiring and repairing expensive screening equipment.

Claims (10)

1. A screening device comprising a sieve installed in a tilted casing comprising a frame with tensioned strings forming a screening surface, string fastening elements, tensioning devices and a mechanism for adjusting the gap between the strings, characterized in that the frame is made in the form of two adjacent articulated parallelograms with a common a longitudinal bar and a clearance adjustment mechanism made in the form of a helical gear, the screw of which is mounted on the frame with the possibility of rotation and is located on one straight line with a common longitudinal bar, and the nut is interfaced with the transverse bars of adjacent articulated parallelograms by means of two connecting rods diametrically opposed to its surface. 2. The device according to p. 1, characterized in that the transverse laths of the frame are folded in the opposite direction from the screening surface and combs are fixed on them with grooves equally spaced from each other with the possibility of arranging strings in them. 3. The device according to p. 2, characterized in that the sieve is equipped with estruses made in the form of plates mounted above the lower transverse frames of the frame, with the upper edge adjacent to the combs not higher than the level of the screening surface. 4. The device according to p. 1, characterized in that the sieve is equipped with a divider mounted above the common longitudinal strip of adjacent articulated parallelograms and made in the form of a profile corner, with its vertex facing up. 5. The device according to claim 1, characterized in that it is equipped with plates for restricting the flow of material, the upper two of which are mounted on the inner side walls of the casing opposite to each other at an angle to the screening surface, and the two lower ones are mounted on the side longitudinal strips of the frame the location of their upper edges in the angular gaps between the upper plates and the casing. 6. The device according to p. 1, characterized in that the sieve is installed in the casing in the rails with the possibility of output outside the casing. 7. The device according to p. 1, characterized in that the angle of inclination of the sieve to the horizon is 50-70 °. 8. The device according to p. 1, characterized in that the casing is equipped with front swing doors of an L-shaped section, the hinges of which are located vertically on the side walls of the casing. 9. The device according to p. 1, characterized in that in the upper end of the casing is made a hatch with a hinged cap, commensurate with the width of the sieve. 10. The device according to p. 1, characterized in that the casing is equipped with an aspiration pipe.

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