RU2705850C2 - Screen and method of screen modification - Google Patents

Abstract

FIELD: separation or sorting of solid materials.

SUBSTANCE: disclosed group of inventions relates to screening and can be used in mining industry and in bulk materials production. Screen for mining industry or enterprises for production of loose materials contains at least one sieve surface, having support structure, plurality of spaced apart clamping plates made at least partially from the elastically deformable elastomer material and attached to the support structure, a plurality of elastically deformable sieve panels attached to the clamping bars, a plurality of protective planks of the surface located between the clamping bars and the support structure. Protective planks of the surface comprise an elongated body having a substantially flat lower engagement surface of the supporting structure and, in fact, a convex upper engagement surface of the clamping plates. Protective planks of the surface further comprise a flange at each end of the elongated body. Method of modifying the screen includes steps of installing a plurality of spaced-apart clamping bars on the support structure, fastening a plurality of elastically deformable sieve panels to the clamping bars, a plurality of protective planks of the surface are pre-positioned on a support structure and a plurality of spaced apart clamping bars are arranged on said protective planks.

EFFECT: technical result is increase in sizing efficiency, as well as reduced sifting of sieve surfaces.

12 cl, 23 dwg

Description

This invention relates to screening. More specifically, it relates to a screen and a method for modifying a screen.

In the mining industry and in the enterprises for the production of bulk materials it is known to use screening using one or more screening surfaces. A particular or each screen surface comprises a support structure on which one or more flat relatively rigid screen panels are supported. Screen panels are made of steel or cast elastomer (rubber, polyurethane) and are rigid or semi-rigid. The problem with these panels is that they are clogged, i.e. openings in panels tend to clog, thereby reducing the effectiveness of these panels.

In an attempt to overcome the clogging problems associated with rigid panels, it is known to use a screen using elastically deformable screen panels made of elastomeric material. These panels are attached to the so-called floating frame bed, shaking the panels with high frequency, thereby reducing the clogging effect associated with the hard panels. Examples of panels of this type are those sold under the trademark `` Liwell '' from Hein-Lehmann AG, or `` Trisomat '' from IFE Aufbereitungstechnik GmbH or `` BIVITEC '' from Binder + Co. This type of screen is sometimes referred to as a “flip-flop” screen.

The problem with flip-flop technology is that it is relatively expensive. In addition, in screening plants, for example, in an ore processing plant, several machines are often used, one after the other. As a result, replacing a conventional hard screen unit with a flip-flop screen unit is both difficult and expensive.

In addition, the downtime required to replace an installed screen with another technology, such as a flip-flop screen, is significant, and it is understandable that any interruption in mining operations or in bulk material production plants will have a negative impact on profitability.

In addition, the decision to replace existing screening equipment with a flip-flop screen does not guarantee a solution to the problem of clogging or screening efficiency. This leads to a decrease in financing of new technologies and hinders the production of the enterprise, which has a negative impact on productivity, while only a small profit can be made, or profit can not be made at all.

It is an object of the present invention to provide screening means capable of at least mitigating some of the problems mentioned above.

In accordance with one aspect of the present invention, there is provided a method for modifying a screen comprising at least one screen surface having a support structure on which at least one screen panel is made of steel or cast elastomer (rubber, polyurethane), wherein the method includes the steps of installing on the supporting structure a plurality of clamping bars arranged at intervals, each clamping bar being at least partially formed from an elastically deformable elastomeric material, and fixing a plurality of elastically deformable screen panels with clamping bars.

By modifying a conventional rigid screen surface according to the method of the present invention, the resulting screen has the advantages of a flip-flop system, thereby reducing the risk of clogging.

In accordance with another aspect of the present invention, there is provided a screen comprising:

- at least one sieve surface having a supporting structure;

- a plurality of spaced-apart clamping strips attached to the support structure, each clamping bar being formed, at least in part, of an elastically deformable elastomeric material; and

- a plurality of elastically deformable screen panels attached by clamping bars.

Even before mounting the clamping bars to the supporting structure, the method may include the step of arranging a plurality of surface protective bars on the supporting structure such that the surface protective bars are located between the clamping bars and the supporting structure. As a rule, surface protective strips and clamping strips are perpendicular to each other. Surface protective strips are usually made of an elastomeric material such as polyurethane. Each surface protection bar may comprise a flat clutch surface of the support structure and a convex pressure bar of the support surface. The clamping bars and screen panels may be provided with mating coupling elements.

More specifically, the mating engaging elements may be mating male (“male”) and female (“female”) mating elements that snap into place by a snap lock latch.

Each clamping bar may comprise an elongated housing having a working lower surface and at least one female engaging element that is open to the upper side of the housing, that is, in the direction opposite to the lower surface. The coupling element may extend over the entire length of the housing.

In one embodiment of the invention, the clamping bar may comprise two parallel spaced spacing clutch members that are open outward from the housing. A wedge receiving groove may be provided between the mating elements. Each female engagement member may comprise an inner part that is generally circular in cross section and an outer part that tapers inwardly towards the inner part so that a neck that has a width less than the width of the inner part is bounded by the intersection of the inner and outer parts .

The housing may be made of an elastomeric material, such as polyurethane. The stiffener core can be integrated into the housing. The stiffness core can be made in the form of metal reinforcement.

The reinforcement may be made in the form of a gutter having a rib and a pair of flanges protruding from the rib in the direction of the lower surface. The flange directed inward may protrude from the free edge of each flange. The hole or slot may extend from the bottom of the housing into the groove between the shoulders.

The screen may comprise a clamping wedge that is inserted into the wedge receiving groove, the wedge receiving groove and the conjugate clamping wedge being such that when the wedge is located in the groove, it serves as an obstacle to disengaging the mating male and female engaging elements, thereby securing the sieve panels clamping levels.

The screen may contain lateral protective elements, protruding upward from opposite edges of the surface formed by sieve panels. In one embodiment of the invention, the side protective elements may be attached to the clamping bars. In the future, the invention will be described with examples with reference to the accompanying graphic materials.

On graphic materials:

- FIG. 1 depicts a three-dimensional partially exploded view of a portion of a screen in accordance with this invention;

- FIG. 2 is a three-dimensional view of the screen of FIG. one;

- FIG. 3 is an end view of the screen of FIG. one;

- FIG. 4 is a sectional view taken along section IV-IV in FIG. 3;

- FIG. 5 is a side view of a clamping bar forming part of a screen;

- FIG. 6 is a sectional view taken along section VI-VI in FIG. 5;

- FIG. 7 is a sectional view of a screen panel forming part of a screen;

- FIG. 8 is a three-dimensional view of a clamping wedge forming part of a screen;

- FIG. 9 is a three-dimensional view of a side protective element forming part of a screen;

- FIG. 10 is a sectional view of the side protector of FIG. nine;

- FIG. 11 is a perspective side view of a closure member, with the lateral guard member secured in a working position;

- FIG. 12 is a three-dimensional view of a protective strip of a surface forming part of a screen;

- FIG. 13 is a three-dimensional view of a partially exploded part of another screen in accordance with this invention;

- FIG. 14 is an end view of the screen of FIG. thirteen;

- FIG. 15 is an enlarged view of a portion of the screen shown in FIG. 14;

- FIG. 16 is a three-dimensional view of a screen panel forming part of the screen of FIG. thirteen;

- FIG. 17 is a cross-sectional view of the screen panel of FIG. sixteen;

- FIG. 18 is a three-dimensional view of a side protective element forming part of the screen of FIG. thirteen;

- FIG. 19 is a sectional view of the side protector of FIG. eighteen;

- FIG. 20 is a three-dimensional view of another screen panel forming part of the screen of FIG. thirteen;

- FIG. 21 is a sectional view of the screen panel of FIG. twenty;

- FIG. 22 shows a clamping bar forming part of the screen of FIG. thirteen; and

- FIG. 23 is a sectional view of the clamping bar of FIG. 22.

In FIG. from 1 to 12 of graphic materials, item number 10 typically refers to the part representing the screen in accordance with this invention.

The screen 10 comprises a plurality of spaced-apart clamping bars 12 attached to a support structure (not shown), and a plurality of resiliently deformed screen panels, typically indicated by reference numeral 14, attached to the clamping bars 12.

The screen 10 comprises a plurality of protective bars of the surface 16 on which the clamp bars 12 are supported, as described in more detail later in this document.

As best seen in FIG. 12 of graphic materials, each protective strip of surface 16 comprises an elongated housing 18 and a flange 20 at each end of housing 18. Housing 18 has a flat clutch surface 22 of a lower or supporting structure and a protruding clamping strip of the supporting surface 24. The protective strip of surface 16 is usually made a single cast of an elastomeric material such as polyurethane.

In FIG. 1 to 6 of graphic materials, each clamping plate 12 comprises an elongated housing, usually indicated by a reference number 26. The housing functionally has a lower surface 28, which is usually flat, and one pair of parallel sidewalls 30 extending upward from the lower surface 28. In the housing 26 there are two parallel spaced in the transverse direction, covering the coupling element 32, which are open upward from the upper surface 34 of the housing 26.

Each female engaging member 32 comprises an inner portion 36 that is generally circular in cross section and an outer portion 38 that is inclined inward toward the inner portion such that the neck 40 is defined by the intersection of the inner portion 36 and the outer portion 38. The female portion the coupling element 32 has the overall appearance of an inverted keyhole with a neck 40 having a width that is less than the width of the inner part 36. In the embodiment considered, the covering part of the coupling ele Cop 32 runs along the entire length of the body.

A wedge receiving groove 42 is located between and extending parallel to the female engaging members 32, and is open outward from the upper surface 34. A mating clamping wedge 44 (see FIG. 8) fits snugly into the wedge receiving groove 42, as described in more detail later herein.

As best seen in FIG. 6 of graphic materials, a stiffener core 46 is integrated in the housing 26. The stiffener core 46 comprises a lower part, usually indicated by a reference number 48, and an upper part, usually indicated by a reference number 50. The lower part 48 is typically molded into a groove having a rib 52 and a pair of parallel flanges 54 protruding from the rib 52 toward the bottom surface 28. The inwardly flange 56 projects inward and upward from the free edge of each flange 54. A hole or groove 58 extends through the housing from the bottom surface 28 into the inner part st chute.

The upper part 50 comprises a pair of L-shaped elements 60 attached to the rib 52. The housing 26 is typically cast from an elastomeric material such as polyurethane. Typically, the stiffener core 46 will be installed in the mold before filling with the elastomeric material so that the stiffener core is fixed in the housing 26. The stiffener core is usually made of metal, such as steel.

As best seen in FIG. 5 from graphic materials, a plurality of curved recesses 62 arranged longitudinally with an interval in the transverse direction are made on the lower surface 28 of the housing 26. The curvature of the recesses 62 is conjugated with the supporting surface of the clamping strips 24 of the protective strips of the surface 16.

Each clamping bar 12 comprises a fastening element, usually indicated by a reference numeral 64, protruding from the end of the housing 26. The fastening element comprises a steel plate 66 on its lower surface, whereby the clamping bar can be attached to the supporting structure, as described in more detail later in this document .

In FIG. 1, 2, 3, 4, and 7 of graphic materials, each screen panel 14 comprises a rectangular frame 68 having a pair of ends 70 and a pair of sides 72. A perforated rib 74 extends between the ends 70 and the sides 72. The rib is concave upward.

The sieve panel 14 comprises a male engaging member 76 protruding downward from each side 72, the male engaging member 76 being mating to the female engaging members 32.

The screen 10 contains side protective elements 78 attached to and protruding upward from the ends 70 of the sieve panels 14, as described in more detail later in this document.

As best seen in FIG. 9 and 10 from graphic materials, each lateral protective element 78 comprises a base 80 and a side wall 82 protruding upward from the base 80 in the working position. The base 80 comprises a plurality of holes 84 longitudinally spaced through it, resulting in side the protective elements 78 are attached to the sieve panels 14. The lateral protective elements 78 are usually formed as an integral casting of a synthetic plastic material such as polyurethane.

During use, when it is desired to replace ordinary steel or elastomer casting in a sieve panel, a plurality of clamping bars 12 are located on the protective bars of the surface 16 with a supporting surface 24 of the clamping bars of the protective bars of the surface 16 located in the recesses 62. The clamping bars 12 are fixed in the working position by installing a T-bolt in the steel rod 48 and attaching to an existing supporting structure. As a result, a plurality of protective strips of the surface 16 are laid on the clamping strips 12 and clamped by them. The surface protective strips are arranged so that they extend parallel to the flow direction of the material to be screened.

In this case, the sieve panels 14 are arranged so that the male engagement elements 76 are engaged with the mating female engagement elements 32 of the adjacent clamping bars 12, as shown in FIG. 4 graphic materials.

The male engagement members 76 are mated in shape with the male engagement members and snap into place with a snap lock lock.

The clamping wedges 44 are then inserted into the wedge receiving grooves 42 of the clamping bars 12, which effectively serve for more durable locking of the male engagement elements in the female engagement elements 32.

The ends 70 of each screen panel 14 are fastened to the side protective elements 78 in working position by means of fasteners 86, one of which is shown in FIG. 11 graphic materials that are inserted into the holes 84 and enter into engagement with the conjugate holes 87 provided at the ends 70 of the sieve panels 14.

Each base 80 is provided with a recess 88, which engages with a mating protrusion 90 provided at the end of the housing 26, from which the fastening element 64 protrudes outward and which serves to more securely install the side protective elements 78 in the working position.

The screen 10 is designed so that the screen panels 14 extend laterally, as shown by arrow 92, to the flow direction of the material to be screened.

The screen surface formed by the screen panels 14 is inclined from the upper end 94 to the lower end 96.

In use, the material to be screened is fed to the screen panels in the direction of the upper end 94, and the screen 10 vibrates so that the material moves in the direction indicated by arrow 92.

It should be borne in mind that the graphic materials show only part of the screen in accordance with the invention.

In the shown embodiment of the invention, two screen panels 14 are provided. It should be appreciated, however, that the screen surface is formed by panels, which typically comprise some of the panels 14, located side by side, as shown in the graphic materials.

The number of panels is not constant. However, usually the number will be between a minimum of 4 panels and a maximum of 30.

However, it can be assumed that larger machines (requiring more panels) may be required.

Turning now to FIG. 13 to 23 of graphic materials in which reference numeral 100 generally refers to a part representing another screen according to the invention, and unless otherwise indicated, the same reference numerals indicated above are used to denote such parts.

The screen 100 uses two types of screen panels 102 and 104. As best seen in FIG. 16 and 17 of graphic materials, the sieve panel 102 comprises a rectangular flat perforated housing 106 with male engagement elements 76 protruding downward from the long edge of the housing 16.

As best seen in FIG. 20 and 21 of graphic materials, each sieve panel 104 comprises a rectangular housing 108 that is approximately twice as wide as the housing 106. The male engagement member 76 projects downward from each long edge of the housing 108. The centrally located longitudinally engaged male engagement member 110 projects downward from the housing immediate proximity, but slightly offset from the center of the case. In the illustrated embodiment, parallel rows of substantially square holes are provided in the transverse direction in the housing.

However, the location, shape and size of the holes may vary depending on the intended application.

In addition to the clamping bars 12, the screen 100 uses the clamping bars 112, which are best seen in FIG. 22 and 23 of graphic materials, each of which contains an elongated body 114 surrounding the stiffener core 116, which has the shape of a groove similar to that built into the clamping strips 12.

However, the upper surface of the housing 114 forms a single upward opening of the female engaging member 32, which is latched by a snap-fit locking lock with the male engaging member 110, as described in more detail later herein.

To assemble the screen 100, proceed similarly to the procedure described above with reference to the screen 10.

In particular, a plurality of protective strips of the surface 16 are located on the supporting structure.

Surface protective strips are installed in longitudinal spaced parallel rows extending in the transverse direction. Each row contains many protective strips of the surface.

A plurality of clamping planks 12 and 112 are laid on the protective planks of the surface 16 so that they are laterally spaced in the longitudinal direction.

The sieve panels 102 and 104 are arranged in such a way that the male coupling element of the sieve panels is snapped into place by a snap-fit locking lock with the mating female coupling element of the clamping bars 12, 112. In this regard, the clamping bars 112 are arranged so that they are coaxial with and engage with the central male engagement elements 110 of the mounting panels 114.

As described above, as soon as the male engaging member engages with the female engaging member, the clamping wedge 44, which is typically made of an elastomeric material such as rubber, is inserted into the wedge receiving groove 42 to lock the panels into position.

It will be appreciated that in this embodiment, the clamping bars 12 extend in the longitudinal direction. The screen 100 uses side protection bars 118, each of which has a single male engagement member 20, which, as best seen in FIG. 14 and 15 are made of graphic materials and are capable of snapping-in by means of a snap-lock locking lock with a mating female engaging element 32 of the clamping bar 12 located on the edge of the screen.

In this case, the screen surface formed by the screen panels 102 and 104 is horizontal or slightly inclined.

The screen vibrates, and the material to be screened is fed to a surface formed by screen panels in the direction of its loading end.

Since the device vibrates, the material to be screened moves from the loading end to the discharge end through the sieve surface, while a certain proportion of the material passes through the openings in the sieve panel.

As can be seen from the above description, the screen and the method for modifying the screen in accordance with this invention allows a conventional screen, which uses steel or cast rubber / polyurethane for a sieve surface, to be modified so that it can be used as a flip system -flop '' with the advantages associated with it, and only for the share of funds that could be involved in replacing the existing screen with a screen of the type `` flip-flop ''.

Several changes that can be made in the screen and in the method of modifying the screen are presented in such a way that everything is included in the scope of the attached claims. In practice, the materials used and the possible sizes and shapes can be any, in accordance with the requirements and prior art.

Claims (20)

1. A screen (10, 100), in particular for the mining industry or enterprises for the production of bulk materials, containing: - at least one sieve surface having a supporting structure; - a plurality of spaced-apart clamping bars (12, 112) attached to the support structure, wherein said clamping bars (12, 112) are made at least partially of an elastically deformable elastomeric material; and - a plurality of elastically deformable sieve panels (14, 102, 104) attached to said clamping bars (12, 112); a plurality of surface protective strips (16) located between said clamping strips (12, 112) and a supporting structure, said surface protective strips (16) having an elongated body (18) having a substantially flat lower engagement surface (22) a supporting structure and a substantially convex upper grip surface of the clamping bars (24), wherein said surface protective bars (16) further comprise a flange (20) at each end of the elongated body (18). 2. A screen (10, 100) according to claim 1, characterized in that said protective surface strips (16) are substantially perpendicular to said clamping strips (12, 112). 3. A rumble (10, 100) according to one or more of the preceding paragraphs, characterized in that said clamping bars (12) comprise an elongated body (26) having a substantially flat lower surface (28) and a pair of parallel sidewalls (30 ) extending upward from said lower surface (28), and two parallel spacing clutch elements (32) arranged transversely spaced apart and provided in an elongated housing (26) open upward from an upper surface (34) of said elongated housing (26). 4. A screen (10, 100) according to claim 3, characterized in that the stiffness core (46) is integrated into said elongated body (26). 5. A screen (10, 100) according to claim 4, characterized in that the plurality of curved recesses (62) arranged at longitudinal intervals in the transverse direction are made essentially in the flat lower surface (28) of the elongated body (26) of said clamping laths (12), wherein the curvature of said recesses (62) is conjugated to the curvature of the substantially convex upper engagement surface (24) of said protective surface laths (16). 6. Rumble (10, 100) according to one or more of claims. 3-5, characterized in that said clamping strips (12) comprise a fastening element (64) protruding from the end of an elongated body (26) of said clamping strips (12), said fastening element (64) comprising a steel plate on its lower surface (66) for attaching said clamping bars (12) to said supporting structure. 7. Rumble (10, 100) according to one or more of the preceding paragraphs, characterized in that said screen panels (14) comprise a rectangular housing (68) having a pair of ends (70) and a pair of sidewalls (72), bent upward a perforated rib (74) extends between said ends (70) and sidewalls (72). 8. A screen (100) according to one or more of the preceding claims, characterized in that it comprises a first (102) and a second (104) type of screen panels, said first type of screen panels (102) comprising a first rectangular flat perforated housing (106) ), wherein said second type of screen panels (104) comprises a second rectangular flat perforated housing (108), which is approximately two times wider than the first rectangular flat perforated housing (106). 9. A screen (10, 100) according to claim 7 or 8, characterized in that said screen panels (14, 102, 104) comprise a male engaging element (76) protruding downward from said rectangular housing (68, 106, 108) wherein said male engaging member (76) is mated to said female engaging members (32) provided in an elongated body (26) of said clamping bars (12, 112). 10. A method of modifying a screen comprising at least one screen surface having a support structure on which at least one screen panel is made of steel or cast elastomer, comprising the steps of: - set a plurality of spaced-apart clamping bars (12, 112) on said support structure, said clamping bars (12, 112) being made at least partially of an elastically deformable elastomeric material; and - attach a plurality of elastically deformable sieve panels (14, 102, 104) to said clamping bars (12, 112);  - pre-positioned a lot of protective strips of the surface (16) on the specified supporting structure and - install a plurality of spaced-apart clamping strips (12, 112) on said surface protective strips (16), said surface protective strips (16) comprising an elongated body (18) having a substantially flat lower engagement surface (22) supporting the structure and the substantially convex upper grip surface of the clamping bars (24), wherein said surface protective bars (16) further comprise a flange (20) at each end of the elongated body (18). 11. A method for modifying a screen according to claim 10, characterized in that the clamping bars (12, 112) comprise an elongated housing having at least enveloping engaging elements (32) with an opening upward from the upper surface (34) of said elongated housing (26 ), wherein the sieve panels (14, 102, 104) comprise a male engaging element (76) protruding downward from them, and said male engaging element (76) is mated to said female engaging elements (32) provided in the elongated body of said clamping strips (12, 112), and indicated Stage mounting a plurality of said elastically deformable sieving panels (14, 102, 104) to said clamping plate (12, 112) is performed by snap-locking locking said male coupling element (76) engages in said female element (32). 12. The method of modification of the screen according to paragraphs. 10 and 11, characterized in that said surface protective strips (16) comprise an elongated body (18) having a substantially flat lower clutch surface (22) of the supporting structure and a substantially convex upper clutch surface (24) of the clamp bar moreover, said clamping bars (12, 112) comprise a plurality of curved recesses (62) arranged longitudinally with an interval in the transverse direction, provided in a substantially flat lower surface thereof, the curvature of said recesses (62) being conjugated with the curvature, noun In addition, the convex upper grip surface of the clamping plate (24) of said surface protective strips (16), and said step of installing a plurality of spaced apart clamping strips (12, 112) on said surface protective strips (16) is carried out by setting essentially convex upper surface of the clutch (24) of the specified protective strips of the surface (16) in the indicated recesses (62).

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