EA039605B1 - Vibratory screening machine and method of screening a material - Google Patents

Abstract

Vibratory screening machines that include stacked screening deck assemblies are provided. In some embodiments, at least one of the vibratory screening machines may include an outer frame, an inner frame connected to the outer frame, and a vibratory motor assembly secured to the inner frame for vibrating the inner frame. A plurality of screen deck assemblies may be attached to the inner frame in a stacked arrangement, each configured to receive replaceable screen assemblies. The screen assemblies may be secured to respective ones of the plurality of the screen deck assemblies by tensioning the screen assemblies in a direction that a material to be screened flows across the screen assemblies. An undersized material discharge assembly may be configured to receive materials that pass through the screen assemblies, and an oversized material discharge assembly having a deflector may be configured to receive materials that pass over the screen assemblies.

Description

The present application is separated from the Eurasian Patent Application No. 201990809 filed by

10/16/2017, claiming priority by filing date of first applications: US 62/408,514 filed with the US Patent Office on 14.190.2016 and US 62/488,293 filed with the US Patent Office

04/21/2017.

Brief description of the drawings

In FIG. 1 is a perspective side view of a vibrating screen in accordance with one or more embodiments of the present invention;

in fig. 2 is a top perspective view of the vibrating screen shown in FIG. one;

in fig. 3 is a front view of the vibrating screen shown in FIG. 1 and 2;

in fig. 4 is a rear view of the vibrating screen shown in FIG. 1, 2 and 3;

in fig. 5 is an isometric view of a sieve deck on which sieve assemblies are mounted, in accordance with one or more embodiments of the present invention;

in fig. 6 is an enlarged partial isometric view of the sieve deck shown in FIG. 5, without sieve units installed on it, as part of a vibrating screen, shown in FIG. 1, 2, 3 and 4;

in fig. 7 is an enlarged side view of a wash tray that may be included with the sieve deck shown in FIG. 5 and 6, in accordance with one or more embodiments of the present invention;

in fig. 8 is an isometric view of a ratchet tensioner in accordance with one or more embodiments of the present invention;

in fig. 9A is a side view of the screen shown in FIG. 5, 6 and 7 with the ratchet shown in FIG. eight;

in fig. 9B is an enlarged view of the ratchet shown in FIG. 9A;

in fig. 10 is an enlarged partial isometric view of the feed assembly and screen deck shown in FIG. 5, 6 and 7 mounted on the vibrating screen shown in FIG. 1, 2, 3 and 4;

in fig. 11A is a bottom isometric view of an underscreen material discharge unit in accordance with one or more embodiments of the present invention;

in fig. 11B is a top isometric view of the underscreen material discharge unit shown in FIG. 11A;

in fig. 12A is a bottom isometric view of an oversize discharge box in accordance with one or more embodiments of the present invention;

in fig. 12B is a top isometric view of the oversize discharge box shown in FIG. 12A;

in fig. 13A is a top isometric view of an oversize discharge chute in accordance with one or more embodiments of the present invention;

in fig. 13B is a bottom isometric view of the oversize discharge chute shown in FIG. 13A, in accordance with one or more embodiments of the present invention;

in fig. 14 is a cross-sectional side view of a screen deck containing material passing through the screen deck and defining the impact zone of a screen assembly included in the screen deck assembly, in accordance with one or more embodiments of the present invention;

in fig. 15 is a side view of a trough showing filter material falling onto a filter element impingement zone, in accordance with one or more embodiments of the present invention;

in fig. 16A is a perspective front view of a sieve assembly in accordance with one or more embodiments of the present invention;

in fig. 16B is a side view of a sieve for use in an embodiment of the present invention.

Detailed disclosure of the invention

The present invention generally relates to methods and apparatus for screening materials, in particular for separating materials of various sizes. Embodiments of the present invention include screening systems, vibrating screens and vibrating screen devices and screen assemblies for separating materials of different sizes.

Vibratory screening systems are disclosed in US Pat. Nos. 6,431,366 B2 and 6,820,748 B2. Advantages of the present invention over previous systems include higher throughput for separating materials without an associated increase in machine size. Embodiments of the present invention include improved features such as: screen deck assemblies having first and second screens; tensioners that tension each screen in a front-to-back direction (ie, in the direction of flow of the material to be screened); washing trays located between the first and second sieves; loading boxes configured to connect directly to an upstream loading system, such as the loading systems disclosed in US Patent Application No. 2014/0263103 A1; centralized unloading units that collect undersize and oversize materials; and interchangeable sieve assemblies configured to be tensioned from front to back, and material flow impingement zones on the sieve assemblies. These features, among others disclosed herein, provide a compact design that provides a direct top loading system, increased screening capacity and reduced footprint. In addition, multiple screen assemblies that are stretched from front to back with flush pans in between and impact zones on the screen assemblies themselves provide improved flow characteristics and throughput. Advanced tension structures allow quick and easy replacement of screen assemblies. Advanced discharge units provide optimum or near-optimum flow characteristics and also provide a much smaller footprint. These and other improvements and advantages are provided by at least some embodiments in accordance with aspects of the present invention.

In exemplary embodiments of the present invention, vibrating screens are used to separate materials of different sizes. In some embodiments, the vibrating screen includes a frame assembly, a plurality of screen deck assemblies mounted on the frame assembly, an undersize material discharge unit, and an oversize material discharge unit. The frame assembly includes an inner frame mounted on an outer frame. A plurality of sieve deck assemblies are installed on the inner frame in several tiers with a shift. Each sieve deck assembly includes a first sieve deck and a second sieve deck, a flushing tray extending between the first and second sieve decks, and a tension assembly. At least one vibration motor may be attached to the inner frame and/or at least one sieve assembly. The undersize material discharge unit and the oversize material discharge unit, each of which may include at least one vibration motor, communicate with each sieve deck unit and are configured to receive screened undersize and oversize material, respectively, from the sieve deck units.

In one embodiment of the present invention, the vibrating screen includes an outer frame, an inner frame connected to the outer frame, a vibration motor assembly attached to the inner frame such that it vibrates the inner frame. A plurality of sieve deck assemblies are attached to the inner frame in a stacked arrangement, with each sieve assembly capable of receiving interchangeable sieve assemblies. The sieve units are attached to the sieve deck units by tensioning the sieve units in the direction of the screening material flow through the sieve units. The undersize material unloading unit is configured to receive materials that have passed through the sieve units, and the oversize material unloading unit is configured to receive materials that pass over the upper surface of the sieve units. The undersize material discharge unit includes an undersize material box communicating with each of the screen deck units, and the oversize material discharge unit includes an oversize material box unit communicating with each of the screen deck units.

The oversize box assembly may include a first oversize box assembly and a second oversize box assembly. The underscreen box, the first oversize box assembly, and the second oversize box assembly may be located below the plurality of screen deck assemblies, with the underscreen material discharge box being positioned between the first and second oversize box assemblies. At least one of the plurality of screen deck assemblies may be replaceable. Each screen deck assembly may include a first screen assembly and a second screen assembly. Between the first sieve node and the second sieve node may be located flushing tray. A chute may be located between the first sieve assembly and the second sieve assembly. The gutter may include a practical profile weir design.

The vibrating screen may include a screen tensioning system that includes tension rods extending substantially perpendicular to the direction of flow of the material to be screened. The tension rods can be configured to mate with a part of the sieve assembly and tension the sieve assembly during rotation. The sieve tensioning system may include a ratchet assembly configured to rotate the tension rod so that it moves between a first, open, position of receiving the sieve assembly and a second, closed and fixed, tension position of the sieve assembly.

The vibrating screen may include a vibrating motor, said vibrating motor being attached to the oversize box assembly. The vibrating screen may include a plurality of feeder units, with each feeder unit located substantially directly below the separate outlets of the flow divider. The vibrating screen may include at least eight screen deck assemblies.

The oversize box assembly may include a bifurcated chute that is configured to receive materials that do not pass through the screen assemblies and are conveyed through the discharge end of the screen deck assemblies. The first section of the bifurcated chute can feed

- 2 039605 the first oversize box assembly, and the second section of the bifurcated chute can feed the second oversize box assembly.

In one embodiment of the present invention, the sieve deck assembly includes a first sieve deck for receiving a first sieve deck assembly, a second sieve deck for receiving a second sieve assembly downstream of the first sieve deck assembly; and a chute located between the first and second sieve deck assemblies, the first sieve deck assembly being designed to receive screening material, and the chute being designed to accumulate screening material before it reaches the second sieve deck assembly.

The chute may include at least one of an Ogee-weir weir and a wash trough. The screen deck assembly may include first and second screen tension systems, each having tension rods extending substantially perpendicular to the direction of flow of the material to be screened. The first tension rod may be configured to rotate with the first part of the first sieve assembly, and the second tension rod may be configured to rotate with the second part of the second sieve assembly.

The first sieve tension system may include a first ratchet assembly configured to rotate the first tension rod so that the first tension rod moves between the first, open, position of receiving the sieve assembly to the second, closed and fixed, tension position of the sieve assembly. The second sieve tension system may include a second ratchet assembly configured to rotate the second tension rod so that the second tension rod moves between the first, open, position of receiving the sieve assembly to the second, closed and fixed, tension position of the sieve assembly.

In one embodiment of the present invention, a method for screening material includes feeding material to a vibrating screen having a plurality of screen deck assemblies arranged in a stacked arrangement, each of the screen deck assemblies being configured to receive replaceable screen assemblies that are attached to the screen deck assemblies by tension of the sieve units in the direction of the flow of material through the sieve units, and with the possibility of screening materials in such a way that the under-screen material that passes through the sieve units enters the under-screen material unloading unit, and the over-size material, passing through the end of the sieve unit, enters the unit unloading oversize material. The undersize material discharge unit includes an undersize material box communicating with each of the screen deck units, and the oversize material discharge unit includes an oversize material box unit communicating with each of the screen deck units.

The oversize box assembly may include first and second oversize box assemblies. The underscreen box and the first and second oversize box assemblies may be located under a plurality of screen deck assemblies, with the underscreen box being positioned between the first and second oversize box assemblies.

At least one of the plurality of screen deck assemblies may be replaceable. Each sieve deck assembly may include first and second sieve assemblies. A chute can be located between the first and second sieve nodes. The gutter may include a practical profile weir design.

A screen tensioning system may be provided having tension rods that extend substantially perpendicular to the direction of flow of the material to be screened. Tension rods can be made with the possibility of mating with a part of the sieve assembly and with the possibility of tensioning the sieve assembly during rotation.

In FIG. 1-4, a vibrating screen 100 is shown. The vibrating screen 100 includes a frame assembly having an outer frame 110 and an inner frame 120, a feed assembly 130, a plurality of screen deck assemblies 400, an upper vibratory assembly 150, an underscreen material assembly 160, and an oversize collection assembly 170.

In FIG. 1 is a side perspective view of a vibrating screen 100. FIG. 2 is a perspective view of the vibrating screen 100 from above, seen from the opposite side of the vibrating screen 100 shown in FIG. 1. As shown in FIG. 2, the opposite side of the vibrating screen 100 includes mirror-image components of the outer frame 110 shown in FIG. 1. Mirrored outer frame components are identified by adding a dash (') to the end of the respective component reference number.

As shown in FIG. 1 and 2, the outer frame 110 includes a longitudinal set of base legs 111 and 111', a transverse set of base legs 112 and 112', and two sets of vertical channels 113 and 113' and 114 and 114'. Vertical channels 113 and 113' and 114 and 114' each have first ends 113A and 113'A and 114A and 114'A, middle portions 113B and 113'B and 114B and 114'B and second ends 113C and 113'C and 114C and 114C, respectively. Each of the first ends 113A and 113'A and 114A and 114'A is raised relative to the second ends 113C and 113'C and 114C and 114'C, with the middle sections 113B and 113'B and 114B and 114'B passing along the length between the first and second ends, respectively. The outer frame 110 further includes upper slant channels 115 and 115' and lower slant channels 116 and 116'. The upper slant channels 115 and 115' and the lower slant channels 116 and 116' each have first ends 115A and 116A, middle portions 115B and 116B, and second ends 115C and 116C, respectively. First ends 115A and 116A are raised relative to second ends 115C and 116C, and middle portions 115B and 116B extend lengthwise between first ends 115A and 116A and second ends 115C and 116C, respectively. The outer frame 110 also includes three sets of angled channels: 117 and 117', 118 and 118', and 119 and 119'. Each angled channel has a first end, 117A, 118A and 119A, which is elevated from its respective second end, 117B, 118B, 119B.

As shown in FIG. 1 and 2, opposite ends of the longitudinal base legs 111 and 111' are attached to opposite ends of the transverse base legs 112 and 112' so that the four base legs form a rectangle. The second ends 113C and 113'C and 114C and 114'C of each respective vertical channel are attached to the four corners where the base channels 111 and 111' meet with the base channels 112 and 112'. The middle part 113B and 113'B of the vertical channel 113 is attached to the first end 119A of the inclined channel 119. The second end 119B of the inclined channel 119 rests on the longitudinal base support 111. 118A of the slant channel 118. The first end 115A of the upper slant channel 115 is attached to the first end 117A of the slant channel 117. The second end 117B of the slant channels 117 is attached to the middle portion 116B of the lower slant channel 116 towards the first end 116A. The second end 118B of the slant channel 118 is attached to the middle portion 116B of the lower slant channel 116 towards the second end 116C. The second end 116C of the lower slant channel 116 is attached to and terminates at the second end 119B of the slant channel 119.

As shown in FIG. 2, the outer frame 110 further includes a rear channel 109 having opposite ends that are attached to one of each middle portions 113B and 113B' of the vertical channels 113 and 113'. Additional rear channels 108 run parallel to the rear channel 109, each with an opposite end attached to the lower slanted channel 116 and the symmetrical lower slanted channel 116' from the middle portion 11 towards the second end 116C to provide structural support for the outer frame 110.

As shown in FIG. 2, the inner frame 120 allows the upper vibratory assembly 150 and the screen deck assemblies 400 to be mounted using fasteners such as bolts. The inner frame 120 includes upper slant channels 125 and 125', lower slant channels 126 and 126', upper slant channels 127 and 127', and lower slant channels 128 and 128'. The upper and lower oblique channels 125 and 126 of the inner frame 120 run parallel to the upper and lower oblique channels 115 and 116 on the middle side of the outer frame 110. The upper and lower inclined channels 127 and 128 of the inner frame 120 run parallel to the inclined channels 117 and 118 on the middle side of the outer frame 110. Although not shown in FIG. 1 and 2, the inner frame 120 may be mounted to the outer frame 110 using elastomeric mounts or other similar mounts that allow the inner frame 120 to support vibrational motion while mitigating the effects of vibration on the structural integrity of the stationary outer frame 110. In one embodiment, elastomeric The fasteners are made of a composite material containing rubber and have female threads that accept male bolts from the inner frame and the outer frame. Elastomeric fasteners may be interchangeable parts. Although the outer frame 110 is shown in the specific configuration disclosed, it may be configured in a variety of configurations so long as it provides the structural support necessary for the inner frame 120. In embodiments, the vibrating screen 100 may have an outer frame that includes legs configured with the ability to attach to an existing structure.

In some embodiments, the upper vibration assembly 150 includes side plates 153 and 153', a first vibration motor 151A, and a second vibration motor 151B. The side plates 153 and 153' have a top beveled edge 154, a bottom edge 155, and an outer surface 156. The bottom edge 155 of the side plate 153 is attached to the side channel 430 of the screen deck assembly 400 with fasteners such as bolts. The outer surface 156 includes ribs 157 providing structural support for the upper vibration assembly 150. Opposite sides of the vibration motor 151A and the second vibration motor 151B are mounted on the upper chamfered edges 154 of the side plates 153 and 153'. The first and second vibration motors 151A and 151B are configured to vibrate all of the screen deck assemblies 400 mounted on the inner frame 120. Although in FIG. 1 and 2 show a specific configuration, it should be noted that the upper vibration assembly 150 may have other arrangements that retain the functionality disclosed herein.

As shown in FIG. 2, the vibrating screen 100 includes a feed assembly 130. The feed assembly 130 includes a support frame 134, a plurality of vertical supports 136, inlet feed channels 131, positioning arms 132, and output loading channels 133. Positioning arms

- 4 039605

132 are fixed to the base frame 134 and 134' with fasteners such as bolts. The support frame 134 and 134' is located above and parallel to the inclined channels 117 and 117' of the outer frame 110. Vertical supports 136 secure support frames 134 and 134' to angled channels 117 and 117' of outer frame 110 so that loading assembly 130 is fixed relative to vibrating inner frame 120. Inlet channels 131 are configured to receive a slurry flow from a flow divider device such as disclosed in U.S. Patent Application No. 2014/0263103 A1, or from other nodes for passing the flow of material, and supplying it to the outlet channels 133. The outlet channels 133 are located above the raised sides of the sieve deck nodes 400 so that each outlet channel 133 is made with the ability to unload flow of materials 500 to each node 400 sieve decks. Earlier systems have hoses located above the vibrating screens, whereas in the present invention, the inlet configurations on the vibrating screen provide substantially distributed drop points in the stream and a significant reduction in machine height. This is an important space saving feature in at least some embodiments of the present disclosure.

In FIG. 3 is a front view of vibrating screen 100. FIG. 4 shows a rear view of the vibrating screen 100. As shown in FIG. 3 and 4, the vibrating screen 100 includes an undersize collection unit 160 and an oversize collection unit 170. As shown in FIG. 3, the underscreen collection unit 160 includes a plurality of collection trays 161 attached to the underside of each screen deck assembly 400, a plurality of channels 162 communicating with the collection trays 161, and an undersize collection box 166. The oversize collection unit 170 includes a plurality of oversize collection trays 171 mounted on the bottom end plate 428 of each screen deck assembly 400, and two oversize collection chutes 176 and 176' communicating with oversize collection boxes 171. As shown in FIG. 4, oversize collection chutes 176 and 176' include vibrating motors 179 and 179'. As shown in FIG. 3 and 4, the undersize collection box 166 extends between the oversize collection box 171 and the oversize collection channels 176 and 176' below the screen deck assemblies 400 of the vibrating screen 100. Although a specific configuration is shown, the oversize collection channels 176 and 176' material and vibratory motors 179 and 179' may be configured in various configurations as long as they facilitate transport of the oversize material 500 discharged from the screen deck assemblies through the oversize collection troughs 176 and 176'.

In FIG. 5-10 show various views of screen deck 400. FIG. 5 is an enlarged isometric view of the screen assembly 400. The screen deck assembly 400 includes a first screen deck 410, a second screen deck 420, side channels 430 and 430', a wash tray 440, and a tensioner 450. As shown in FIG. 5, the first screen deck 410 and the second screen deck 420 are covered by the first screen assembly 409 and the second screen assembly 419, respectively. The first screen assembly 409 and the second screen assembly 419 are interchangeable screen assemblies attached to the first and second screen decks 410 and 420. of the sieve assembly 409, along the feed end 409A of the first sieve assembly 409, and is passed by vibration through the first sieve assembly 409 of the first sieve deck 410, through the discharge end 409B of the first sieve assembly 409, and into the washing tray 440. The vibration carries the material 500 through the washing tray 440 where the material passes through the feed end 419A of the second sieve deck 419. As disclosed herein, the material 500 strikes the second sieve assembly 419 in the screen impact zone 448, then vibrates over the second sieve assembly 419 of the second sieve deck 420 and through the discharge end 419B of the second screen assembly 419 along the bottom end plate 428. The first screen assembly 409 and the second screen assembly 419 are configured such that the underscreen materials fall through the first screen assembly 409 and the second screen 419 into the underscreen material collection trays 161 and are directed into the undersize material collection box 166 through the channels 162. The oversize material does not pass through the screens 409 and 419 are vibrated beyond the end plate 428 and guided through the oversize collection boxes 171 and 171' into oversize collection channels 176 and 176'. The direction of material flow is indicated by large arrows. Although the drawings show a specific configuration, the oversize collecting boxes 171 and 171' and the oversize collecting chutes 176 and 176' may have different arrangements, provided they receive the oversize products discharged from each screen deck assembly. , and provide functionality as disclosed herein. The flow of material through the separate outer oversize collection boxes 171, 171' and the central integral undersize collection box 166 provides efficient flows in confined spaces. The configuration of the ducts 166, 171, 171' reduces the footprint of the screen 100 while providing a direct and efficient flow.

The first screen deck 410 includes an upper end plate 416 and a lower end plate 418. The second screen deck 420 includes an upper end plate 426 and a lower end plate 428. Opposite sides of the first screen deck 410 and the second screen deck 420

- 5 039605 are attached to the middle sides of the side channels 430 and 430' by means of fasteners such as bolts or welding. The sides of the side channels 430 and 430' include a plurality of slope plates 432. The slope plates 432 include holes through which fasteners, such as bolts, can pass to attach the side channels 430 and 430' to the upper slope channel 127 and 127' and lower channel bars 128 and 128' of the inner frame 120. Although a specific arrangement is shown, the side channels 430 and 430' and the inclined plates 432 may be configured in various configurations, as long as they allow the screen deck assembly 400 to vibrate so that the different sized materials 500 are separated. in the required way.

In FIG. 6 is a perspective partial side view of the screen decks 410 and 420, the wash tray 440, the side channel 430, and part of the tensioner 450. As shown in FIG. 6, the outlet channel 133 of the feed assembly 130 is covered by a flexible material 405. The flexible material 405 can control the flow of material from the outlet channel 133 to the screen deck assembly 400 so that the flow of material is uniformly distributed over the screen deck assembly 400 to maximize the vibrating screen 100. As shown in FIG. 6, the first screen deck 410 and the second screen deck 420 do not include screens 409 and 419, but it should be understood that when the vibrating screen 100 is used to separate materials of various sizes, the first and second screen decks 410 and 420 are covered with screens 409 and 419. , which can be replaced when worn or damaged, as disclosed herein. Let us turn to Fig. 6, where the first screen deck 410 includes rib 412, stringers 414, top end plate 416, and bottom end plate 418. Second screen deck 420 includes rib 422, stringers 424, top end plate 426, and bottom end plate 428. Opposite the ends of the ribs 412 and 422 extend from the side channels 430 and 430' at each of the midpoints between the upper end plate 416 and lower end plate 418 of the first screen deck 410 and the upper end plate 426 and lower end plate 428 of the second screen deck 420, respectively. A plurality of stringers 414 and 424 extend from upper end plates 416 and 426 to lower end plates 418 and 428, respectively. The midpoint 415 of each stringer 414 and the midpoint 425 of each stringer 424 intersect the upper surface of the ribs 412 and 422. The midpoints 415 and 425 are raised from opposite ends of the stringers 414 and 424 so that the stringers 414 and 424 create a bulge or curvature on the first and second sieve decks 410 and 420. Although the first screen deck 410 and the second screen deck 420 are shown with one rib 412 and 422, respectively, it should be understood that the first screen deck 410 and the second screen deck 420 may include other configurations. The first screen deck 410 and the second screen deck 420 may include a first plurality of ribs and a second plurality of ribs, respectively, so long as the additional ribs provide the functionality as disclosed herein. In some embodiments, at least one (or, in some embodiments, each) of the first set of ribs and the second set of ribs may be assembled similarly to rib 412 or rib 422.

Unlike the screen assemblies of other systems, such as those disclosed in US Pat. 422 and 414 and 424 stringers, which are commonly found in welded screen decks. This arrangement eliminates the shrinkage, thermal distortion, and drop associated with closely spaced welds and allows for quick replacement of worn or damaged 414 and 424 stringers in the field. Replaceable stringers 414 and 424 may include plastic, metal, and/or composite materials and may be made by injection molding and/or injection molding. Although not shown in FIG. 6, screen decks 410 and 420 are configured to support screens 409 and 419 that extend over the surface of first screen deck 410 and second screen deck 420, covering ribs 412 and 422 and stringers 414 and 424, respectively, as shown in FIG. 5.

In FIG. 6 also shows that the top end plate 416 of the first screen deck 410 is raised relative to the bottom end plate 418.

Similarly, the upper end plate 426 of the second sieve deck 420 is raised relative to the lower end plate 428. The flushing pan 440 extends between the lower end plate 418 of the first sieve deck 410 and the upper end plate 426 of the second sieve deck 420. The first sieve deck 410, the flushing pan 440 and the second the screen deck 420 is configured such that the flow of material from the outlet channel 133 and the flexible material 405 of the feed assembly 130 intersect the first screen deck 410 and the wash tray 440 before crossing the second screen deck 420. This configuration effectively separates the flow of materials by increasing the surface area on which the flow of materials is subjected to a sieve separation into the oversize material collection unit 170 and undersize material collection unit 160 without increasing the area occupied by the vibrating screen 100.

In FIG. 7 is an isometric side view of a wash tray 440 cooperating with a first sieve deck 410 and a second sieve deck 420. As shown in FIG. 7, the flush tray 440 includes an upper side member 442 having a top portion 442A and a lower portion 442B, a bottom member 444 having a first end 444A and a second end 444B, and a curved side member 446 including a first end 446A and a second end. 446B. Curved side element 446

- 6 039605 includes an S-curve called practical profile (Ogee), discussed in more detail below. The upper portion 442A of the upper side member 442 is connected to the lower end plate 418 of the first screen deck 410. The lower portion 442B of the upper side member 442 is coupled to the first end 444A of the lower member 444. The second end 444B of the lower member 444 is coupled to the first end 446A of the curved side member 446. The second end 446B of the curved side member 446 curves over the top end plate 426 of the second screen deck 420.

The resulting configuration of the wash trough 440 creates a weir 447, which is a trough or recess providing a structure for collecting the flow of liquid or slurry material to be screened 500. Embodiments of the wash trough 440 having a weir design of practical profile have functional significance in the field of fluid dynamics . The weir design of the practical profile is generally described as rising slightly from the base of the weir and reaching a maximum rise of 449 at the top of the S-curve of the practical profile design. At or after the maximum lift point 449 is reached, the fluid falls down the practical profile structure in a parabolic shape. The discharge equation for a weir of a practical profile has the form:

P s $ \u003d - C _a xTs2d (H) g

As shown in FIG. 7, an integrated flushing tray 440 with a curved side member 446 forming a practical weir between the first screen deck 410 and the second screen deck 420 of the screen deck assembly 400 can direct the flow of material screened by the first screen deck 410 to the desired impact point or impact zone 448 nearby. with the top end plate 426 of the second screen deck 420 or other desired location such that the discharge stream falls onto the downstream screen panel at a given wear surface, as opposed to unevenly impacting downstream screen surfaces such as screen openings. In this configuration, the impact point/zone 448 may remain the same despite changes in fluid parameters such as, for example, flow rate and/or viscosity. The incorporation of a practical profile curved side weir 446 into the wash pan 440 improves screening efficiency and consistency and reduces wear on the second screen deck 420. Material flows after impingement are represented by large arrows in FIG. 7.

In FIG. 8, 9A and 9B show tensioner 450. FIG. 8 is an isometric view of tensioner 450. Tensioner 450 includes tensioner bar 451, brackets 454 and 454', and ratchet mechanisms 456 and 456'. In FIG. 9A shows a partial side view of two ratchet mechanisms 456 and two brackets 454 attached to the side channel 430 of the screen deck assembly 400. In FIG. 9B is an enlarged view of one of the two ratchet mechanisms 456 and brackets 454 shown in FIG. 9A. As will be discussed in more detail below, each screen deck assembly 400 includes two tensioners 450, one for tensioning the screen assembly 409 of the first screen deck assembly 410 and the other for tensioning the screen assembly 419 of the second screen deck 420a.

As shown in FIG. 8, the tensioner 450 includes a tension rod 451, brackets 454 and 454', and ratchet mechanisms 456 and 456'. The tension rod 451 includes mirror image opposite ends 452 and 452', a tubular middle portion 453 and a tension bar 455. Opposite ends 452 and 452' of the tension rod 451 pass through holes 457 and 457' in the ratchet mechanisms 456 and 456' and are attached to the ratchet mechanisms 456 and 456' using fasteners such as bolts. The ratchet mechanisms 456 and 456' are attached to brackets 454 and 454', which in turn are respectively attached to the side channels 430 and 430' of the screen deck assembly 400 by fasteners such as bolts, as shown in FIG. 9A and 9B.

Although not shown in FIG. 8, the tubular middle portion 453 of the tension rod 451 extends across the width of the screen deck assembly 400 from the side channel 430 to the side channel 430'. The tension rods 451 of each tensioner 450 are located under the top end plate 416 of the first sieve deck 410 and the top end plate 426 of the second sieve deck 420. The opposite end 452, the tubular middle portion 453, and the tension bar 455 of the tension rod 451 are arranged such that when the opposite end 452 and the tubular middle portion 453 rotate in the counterclockwise direction, the tension bar 455 rotates in the clockwise direction, thereby tightening sieve assembly 409 and/or 419 towards the upper end plate 416 of the first sieve deck 410 and/or the upper end plate 426 of the second sieve deck 420. Although in FIG. 8, the tensioner 450 has a tubular middle portion 453 and a tensioner bar 455, it may include other components, provided that it is capable of receiving the end of the screen assembly 409 and/or 419 and is connected to the ratchet mechanism 456 to allow the ratchet mechanism 456 rotate the tension rod 451 and pull the sieve assembly 409 and/or 419 towards the top end plates 416 and/or 426.

In FIG. 9A shows a partial side view of two ratchet 456 and two brackets 454

- 7 039605 two tensioners 450 mounted on the side channel 430 of the 400 sieve deck assembly. In FIG.

9B is an enlarged view of the ratchet 456 and bracket 454. Although not shown, tension rods 451 extend from each ratchet 456 on the side channel.

430 knots 400 screen decks to each 456' ratchet on opposite side channel

430' under the top end plates 416 and 426 of the 400 screen deck assembly.

In FIG. 10 is an enlarged partial perspective view of a ratchet 456 mounted on a side channel 430 below the first screen deck 410. The first screen deck 410 is shown cooperating with the loading assembly 130 and the flexible flow control material 405. As shown in FIG. 10, the ratchet 456 includes a top 458 and a bottom 460. The top 458 includes a locking bar 459 that engages a plurality of teeth 461 on the bottom 460. The bottom 460 includes an actuation point 462 where the second end 452 of the tension rod 451 passes through the hole 457 of the ratchet 456. As shown in FIG. 10, the wrench 463 is designed to rotate the trigger point 462 of the ratchet mechanism 456. In response to applying a counterclockwise rotation force to the wrench 463, the trigger point 462 and the tubular middle portion 453 of the tension rod 451 can be rotated counterclockwise, and the tension bar 455 can rotate in a clockwise direction so that the tensioner 450 pulls the end of the screen assembly 409 towards the upper end plate 416. 460 can lock tensioners in place and maintain tension. Whereas tensioners used in vibrating screens of the prior art apply tension in the transverse direction or to the side channels 430 and 430' relative to the vibrating screen 100, the tensioner 450 disclosed herein applies tension in a front-to-back direction, or in the direction of the upper end plate 416 and the lower end plate 418 of the first screen deck 410 and/or the upper end plate 426 and the lower end plate 428 of the second screen deck 420, relative to the vibrating screen 100. Unlike prior art tensioners, the direction of tension is from the front -back provided by tensioner 450 corresponds to the flow of material, such as slurry, for example, through the first and second screen decks as separated by the vibrating screen 100. Although in FIG. 10 shows a wrench 463, other tools may be used to rotate the trigger point 462 of the ratchet 456 as long as it provides the functionality as disclosed herein.

In FIG. 11A and 11B show an embodiment of an underscreen collection unit 160. The undersize collection assembly 160 includes a plurality of collection trays 161 attached to the underside of each screen deck assembly 400 (see FIGS. 3 and 4), a plurality of channels 162 communicating with the collection trays 161 and the undersize collection box 166. As shown in FIG. 11A and 11B, the underscreen collecting box 166 includes a mounting end 167 that can be attached to the outer frame 110 of the vibrating screen 100 with fasteners such as bolts, a top surface 168 that extends the length of the collecting box 166, and outlet 169. Each channel 162 includes an inlet 163, a chamber 164, and an outlet 165. The inlet 163 of each channel 162 is configured to receive underscreen material from the collecting trays 161 and load the material through the chamber 164 of the air duct 162 to the outlet 165. Each outlet 165 communicates with a portion of the top surface 168 of the undersize collection tray 166 so that the material discharged from the outlets 165 of the channels 162 enters the collection box 166 and exits through the outlet 169. A hopper may be provided for the undersize material, configured to receive the undersize material, discharged from the outlet 169. Although not shown, the cahn inlets 163 catchers 162 may include radial gaps to communicate vibratory motion from the collecting pans 161 (see fig. 3 and 4) mounted on the screen deck assemblies 400, with the channels 162 and the collecting box 166 mounted on a fixed outer frame 110. Placing the underscreen collecting boxes directly below the channels 162 increases the efficiency of the vibrating screen 100 and saves space by concentrating the flow of all undersize material in the central channel.

In FIG. 12A and 12B in FIG. 13A and 13B show oversize collection unit 170. The oversize collection unit 170 includes a plurality of oversize collection boxes 171 attached to the bottom end plate 428 of each screen deck assembly 400, and two oversize collection chutes 176 and 176' in communication with the oversize collection boxes 171 (see ., for example, Fig. 3 and 4).

In FIG. 12A and 12B show an embodiment of oversize collection box 171. In FIG. 13A and 13B show an embodiment of a collection trough 176 for oversize material. As shown in FIG. 12A and 12B, each oversize collection box 171 has a first side 172 and a second side 172' mirrored to the first side 172, both having an inlet 173 with a mounting bracket 173A, a chamber 174, and an outlet 175. The mounting brackets 173A of each of the collectors boxes 171 for oversize material are attached to

- 8 039605 each bottom end plate 428 of the sieve deck assembly 400 by means of fasteners such as bolts, so that material that does not pass through the sieves 409 and/or 419 into the under-screen material collection assembly rolls off the bottom end plate 428 of the sieve deck assembly 400 decks in the entrance 173 of the collecting box 171 for oversize material (see, for example, Fig. 3-4). Upon entering or after inlet 173, oversize material is directed through chamber 174 and discharged from exit 175 into oversize collection chute 176. Although the oversize material collecting box 171 is shown to have a trapezoidal shape, it should be understood that it is not limited to this configuration. The oversize collection chute 171 may have other arrangements, provided that such a chute can receive oversize material from the bottom end plate 428 of the screen deck assemblies 400 and can transfer the oversize material into one of the oversize collection chutes 176 and 176'.

In FIG. 13A and 13B show that the oversize collection chute 176 includes a mounting end plate 177, a rear face 178, an outlet 180, and a channel 181. The mounting end plate 177 is attached to the rear channel 129 of the inner frame 120 by means of fasteners such as bolts. (for example, see Fig. 3 and 4). A channel 181 extends from the mounting end plate 177 to an outlet 180 below each outlet 175 of the oversize collection boxes 171 so that the oversize material discharged from each oversize collection box 171 falls into the oversize collection channel 181 in the oversize collection chute 176. To increase the speed at which the oversize material passes through the passage 181 to the exit 180, a vibrating motor 179 is attached to the rear surface 178 of the oversize collection chute 176 by means of fasteners such as bolts, which increases the amount of material that the vibrating screen can handle. 100 overall. Although not shown, an oversize bin may be provided that is configured to receive oversize materials discharged from the outlet 180 of the oversize collection chute 176 .

In FIG. 14 is a side view similar to FIG. 7 of a screen deck assembly 400 showing details of a tension assembly 450 tensioning a second screen 419 along a second screen deck 420. As shown in FIG. 14, the material 500 to be screened flows by vibration through the first sieve assembly 409 towards the discharge end 409B of the first sieve assembly 409. During passage, appropriately sized particles of material 500 pass through holes or pores 488A of the first sieve assembly 409. After passing through the discharge end the end 409B of the first sieve assembly 409 material 500 passes into the washing tray 440 and through the curved side member 446 and the maximum lift 449. After passing the maximum lift 449 material 500 enters the impact zone 448 of the second sieve 419, and then through vibration moves along the second sieve 419, passing from the inlet end 419A to the outlet end 419B, with particles of material 500 of the appropriate size passing through the second screen 419 along the way. devices 450, as will be discussed in more detail below.

As can be understood from FIG. 14 and as explained in more detail below, the discharge end 409B, 419B of the screen assemblies 409, 419 is attached to the fixed deck clamp 455B, and the opposite inlet end 409A, 419A is attached to the tension bar 455 of the tensioner 450. As the tension bar 455 is rotated, the screen assembly 409, 419 is pulled from front to back on the respective deck 410, 420 in the same direction as the screening material flows through the screen deck assembly 400. This is an improvement over earlier systems where the screen assemblies were stretched on the sides leaving a ridge perpendicular to the flow of screened material and creating troughs and flow inefficiencies.

In FIG. 15 is a perspective side view of the screen deck assembly 400 showing additional details of the first and second screen screen assemblies 409, 419 stretched over the first and second screen decks 410, 420, respectively. In FIG. 15, parts of sieves 409, 419 have been cut out to show the features of decks 410, 420 under the sieves. The material 500 is shown passing through the wash tray 440 and entering the impact zone 448 of the second sieve 419.

In FIG. 16A and 16B show views of the screen assembly 419 used with the vibrating screen 100 and screen deck assembly 400 disclosed above. Although the following description of the embodiments depicted in FIG. 16A and 16B are made with reference to the second sieve assembly 419, it should be noted that this discussion applies equally to the first sieve assembly 409; the first sieve assembly 409 may typically be identical to the sieve assembly 419, but may optionally have different sizes and configurations, such as different sized area 448 (smaller or larger), different opening size configurations, a combination thereof, or the like.

In FIG. 16A is a perspective view of a front sieve 419 in accordance with one or more embodiments of the disclosure. Screen 419 is releasably tension-attached to deck 420 as disclosed herein. Screen 419 includes a feed end 419A and an opposite discharge end 419B. The width of the sieve 419 is measured between ends 419A and 419B, and the length is measured between opposite side edges 483. The filter zone 488 is formed

a plurality of individual holes or pores 488A extending substantially over the entire surface of the screen 419. The holes 488A are of a selected size, such as a size determined by side lengths having appropriate values in the range of about 20 microns to about 100 microns. In some embodiments, openings 488A may be rectangular in shape and may have substantially the same width or substantially the same thickness in the range of about 43 microns to about 100 microns and substantially the same length in the range of about 43 microns to about 2000 microns.

In the embodiment of FIG. 16A, the filter zone 488 is flanked by an impact zone 448 formed along the loading end 419A, a slat 486 extending along the discharge end 419B, and opposite side slats 484 along the respective side edges 483. The ends of the impact zone 448, the slat 486 and the side slats 484 are combined together into points of contact and together provide structural support for filter zone 488, preventing rupture and the like during installation and operation on screen 100. As shown in FIG. 14, when material 500 flows over the curved member 446 of the wash tray 440, the material 500 enters the impact zone 448. Impact zone 448 protects the integrity of individual openings 488A and prevents or reduces the likelihood of large particles impacting into openings 488A. As indicated in FIG. 14, as material 500 flows from feed end 419A to discharge end 419B, appropriately sized particles of material 500 pass through openings 488A. Impact zone 448 can be of different sizes and configurations depending on the screening application and desired flow characteristics.

As shown in FIG. 16A and 16B, a first link bar 481A is provided along the loading end 419A, while a second link bar 481B is provided along the discharge end 419B. Each connecting bar 481A, 481B may be generally a U-shaped metal bar that is embedded in boot ends 419A, 419B substantially along the length of each respective end 419A, 419B. Although alternative means can be used to attach the connecting bars 481A, 481B to the 419 screen, the connecting bars 481A, 481B are designed to withstand significant forces during operation of the vibrating screen 100 without separating from the 419 screen or otherwise allowing the 419 screen to detach from the deck. 420.

In FIG. 16B is a side view of a strainer 419 for use in an exemplary embodiment of the present invention. When viewed from the side, as in Fig. 16B, screen 419 represents a thin profile. As shown in FIG. 16B, the filter screen 419 includes a material inlet surface 485A on its upper side and a material outlet surface 485B on its opposite lower side. The individual screen openings 488A extend from the inlet side 485A to the outlet side 485B so that, during vibratory screening, individual particles pass through the screen area 488. In the embodiment shown in FIG. 16B, first and second link bars 481A, 481B extend from the underside of screen 419. Each link bar 481A, 481B folds back, such as in an L-shape or C-shape, toward the center of screen 419.

The sieve assembly 409, 419 is sized to match the size of the deck 410, 420. In some embodiments, the sieve assembly 409, 419 is preferably about 56 cm long, about 30 cm wide, and about 0.25 cm thick. cm; narrower or wider impact zones 448 may be used, the former reducing the degree of protection and the latter reducing the number of openings 488A. The bar 486 and side bars 484 are approximately 1 cm wide. The screens 409, 419 are preferably made of polyurethane. Although exemplary embodiments of screens 419 are depicted in FIG. 16A and FIG. 16B for use with the vibrating screen 100 disclosed herein, it will be understood that the screen 100 can be configured to use alternative screen configurations, screen materials, and screen characteristics (opening/pore size, coupling mechanisms, etc.). Examples screens, screen materials, and screen characteristics that may be covered by screens 409, 419 used in screen 100 can be found in U.S. Patent 9,409,209, U.S. Patent Application Publication 2013/313,168 A1, U.S. Patent Application Publication 2014/0262978 A1 and Application Publication for US Patent 2016/0310994 A1 in the name of the present applicant, the contents of which are incorporated herein by reference in their entirety.

A method of attaching the screen assembly 409, 419 to the deck 410, 420 will now be disclosed. As shown in FIG. 14, deck clamps 455B are secured adjacent to respective discharge ends 410B, 420B of decks 410, 420. Deck clamps 455B are sized and designed to attach discharge ends 409B, 419B of screens 409, 419 to screen decks 410, 420. In one embodiment, The deck clamps 455B extend substantially along the length of the discharge end 410B, 420B, similar to the connecting bars 481A, 481B extending along the length of the screen assembly 409, 419. In FIG. 14, the deck clamp has an L-shaped configuration in side view, although other engagement configurations such as C-shaped configurations may be used. As can be understood from FIG. 14, a second link bar 481B extending along the discharge end 409B, 419B of the screen assembly 409, 419 is engaged with the deck clamp 455B such that an L or C shape of the link bar 481B engages with an L or C shape. deck clamp

- 10 039605

455B. To stretch the screen assembly 409, 419 across the entire deck 410, 420, tension is applied towards the feed end 410A, 420A so that the link bar 481B remains connected to the deck clamp 455B. When the screen assembly 409, 419 has been stretched across the entire deck 410, 420, the first connecting bar 481A of the screen assembly 409, 419 is then connected to the tensioner bar 455 of the tensioner 450 so that the L- or C-shaped configuration of the tensioner bar 455 comes into contact with the first connecting strip 481A. Tension is then applied to the screen assembly 409, 419 by the tensioner 450 to thereby selectively attach the first connecting bar 481A to the tension bar 455, whereby the filter 409, 419 will be tightly stretched along the deck 410, 420 for use in material particle sorting. 500 with screen running 100.

After a certain period of operation, the screens 409, 419 can be selectively removed from the deck 410, 420 to be replaced with new screens 409, 419. In the screen removal method, the tensioner 450 is used to release the tension bar 455 from the first bar 481A. The screen assembly 409, 419 is then pulled or pushed toward the discharge end 410A, 420A of the deck 410, 420 to release the second link bar 481B from the deck clamp 455B.

Conventional language, including, for example, may, could, unless specifically stated otherwise or otherwise understood, in the context used, generally implies that certain embodiments may include, while other embodiments do not include certain features, elements and/or functions. Thus, such conditional language does not generally imply that the features, elements, and/or functions are in any way required by one or more implementations, or that one or more implementations necessarily include logic for making a decision, with user input or query or not, whether these features, elements and/or functions are included, or whether they must be performed in any particular embodiment.

This description and the accompanying drawings disclose vibrating screens which include tiered screen deck assemblies. Of course, it is impossible to describe every conceivable combination of elements for the purpose of describing the various aspects of the invention. Thus, while embodiments of this invention have been disclosed with reference to various embodiments and applications, it should be noted that such embodiments are illustrative and that the scope of the invention is not limited thereto. Those skilled in the art will appreciate that many additional combinations and permutations of the disclosed features are possible. In fact, various modifications can be made to the invention without deviating from its scope or spirit. In addition or alternatively, other embodiments of the invention may be apparent from a consideration of the description and accompanying drawings and methods of the invention as presented herein. It is intended that the examples given in the description and the accompanying drawings are to be considered in all respects as illustrative and not restrictive. Although specific terms are used here, they are used in a general and descriptive sense only and not for purposes of limitation.

CLAIM

Claims (15)

CLAIM 1. Method of screening material, including the following: material is loaded onto a vibrating screen containing a plurality of sieve deck assemblies arranged in a stacked layout, each of the plurality of sieve deck assemblies having a front-to-back direction from the end for loading the material to the end for unloading the material and is configured to receive a plurality of replaceable sieves, while the first replacement screen of the plurality of replacement screens is attached to the first screen deck assembly of the plurality of screen deck assemblies by pulling the first replacement screen substantially along said front-to-back direction; and screening of materials is performed so that the undersize material that passes through the first replaceable sieve enters the undersize material discharge unit, and the oversize material passes along the upper surface of the first replaceable sieve into the oversize material discharge unit, and the undersize material discharge unit includes a box for underscreen material communicating with each of the plurality of sieve deck assemblies, and the oversize material discharge assembly includes an underscreen material box assembly communicating with each of the plurality of sieve deck assemblies. 2. The screening method of claim 1, wherein the oversize box assembly includes a first oversize box assembly and a second oversize box assembly. 3. The screening method of claim 2, wherein the undersize box assembly, the first oversize box assembly, and the second oversize box assembly are disposed under a plurality of screen deck assemblies, wherein the underscreen material box assembly is disposed between the first oversize box assembly. oversize material and the second node of boxes for oversize material. 4. The method of screening the material according to claim 1, in which at least one of the plurality of sieve assemblies - December 11 039605 is interchangeable. 5. The screening method of claim 1, wherein at least one of the plurality of sieve deck assemblies includes a first sieve assembly and a second sieve assembly. 6. The method of screening the material according to claim 5, further comprising a chute located between the first sieve unit and the second sieve unit. 7. The method of screening the material according to claim 6, wherein the chute includes a weir structure of a practical profile. 8. The method of screening material according to claim 1, further comprising a sieve tension system, which includes tension rods extending essentially perpendicular to the direction of flow of the screened material, the tension rods being configured to mate with a part of the sieve assembly and tension the sieve assembly during rotation. 9. Vibrating screen for screening particles of screened material containing an outer frame; an inner frame connected to the outer frame; a vibration motor assembly fixed to the inner frame such that the vibration motor assembly vibrates the inner frame; a plurality of screen deck assemblies attached to the inner frame and arranged in a generally stacked arrangement, each of the plurality of screen deck assemblies having a front to back direction from a material loading end to a material unloading end; a plurality of replaceable sieves removably attached to the respective nodes of the plurality of sieve deck nodes, wherein the first replaceable sieve of the plurality of replaceable sieves is attached to the first sieve deck node of the plurality of sieve deck nodes by pulling the first replaceable sieve substantially along the specified front-to-back direction ; the node for unloading the under-screen material, configured to receive particles of the specified material that pass through the first replaceable sieve; and an oversize material discharge unit configured to receive particles of said material that pass over the top surface of the first replaceable sieve, the undersize material discharge unit including an oversize material box communicating with each of the sieve deck assemblies, the oversize material discharge unit includes an oversize box assembly communicating with each of the screen deck assemblies. 10. The vibrating screen of claim 9, wherein at least one of the plurality of sieve deck assemblies includes a first sieve deck and a second sieve deck, the first sieve deck comprising a first replaceable sieve fixed thereon and the second sieve deck comprising a her second replacement sieve. 11. Vibrating screen according to claim 10, further comprising a washing tray located between the first sieve deck and the second sieve deck. 12. Vibrating screen according to claim 10, further comprising a chute located between the first sieve deck and the second sieve deck. 13. The vibrating screen of claim 12, wherein the chute includes a weir structure of practical profile. 14. The vibrating screen of claim 9, further comprising a screen tensioning system that includes tension rods extending substantially perpendicular to a front to back direction, the tension rods being configured to mate with a portion of the screen and tension the screen as it rotates. 15. Vibrating screen according to claim 14, wherein the screen tensioning system includes a ratchet mechanism configured to rotate the first tension rod of the tension rods so as to move the first tension rod between the first, open, receiving position of the sieve assembly to the second , closed and fixed, the tension position of the sieve assembly.