FI57215B - SILANORDNING - Google Patents

Description

ΙΓ · - · Ζ ^ '_ Ι Γ1 ADVERTISEMENT. JUA [BJ 01) UTLÄGCNINGSSKRIFT 5 7215 C (45) Patent r.yonn.Lty 10 07 19JO Patent ceddelat ^ ^ (SI) Kv.lk?/lnt.CI. 3 B 01 D 33/18, 33/06 FINLAND —FINLAND (21) Pm «» ttlh «lcumu * —P« tum * n »eiu» li> | 750093 (22) Hakmnltpllvl - Ameknlngadag 19.01.75 (23) AlkuplM — GlMghttadtc 15.01.75 (41) Has become swept - Blhrtt offuntllg 22.07.75

Patent and Registration Office (44) Date of issue and date of filing__

Patent · och raglaterttyralten 'AraMean utlagd peh utlJkrHtun publkerad 31.03.80 (32) (33) (31) Pyydetty utuoikuue — a «| trd priority 21. oi. 7¾ USA (US) U35163 (71) Hydrocyclonies Corp., 800 Skokie Highway, Lake Bluff, Illinois 600HH, USA (US) (72) Donald P. Welles, Jr., Lake Bluff, Illinois, USA (US) (7I +) Oy Kolster Äh (51 *) Screening device - Silajiordning

The present invention relates to the extraction of solids and in particular to a rotating cylindrical screen which is continuously cleaned during use.

It is a primary object of the invention to provide a screening system with a rotating liquor screen to which the separated water gives a self-cleaning effect.

Another object is to provide a screening device in which the screen rods are arranged substantially parallel and in which each rod has an outer surface and immediately adjacent side surfaces, wherein the angle formed by the line perpendicular to the outer surface and the adjacent side surface is greater than about 7 ° and less than about 45-.

One object is to provide a screening device of the type described, having a minimum diameter of about 280 am and in which the ratio of the diameter of the screen to the radial thickness of the rod is greater than about 75 ·

Yet another object is to provide a screen of the type described which is assembled from substantially parallel bars, wherein the ratio of the radial thickness of the bar to the width of the outer surface of the bar is greater than 1 and less than 2.

Other purposes will be apparent from the following description, drawings, and requirements.

2 57215

The invention is schematically illustrated in the following drawings, in which Figure 1 is a perspective view of one of the nodes of the invention) Figure 2 is an end view of the screen of Figure 1) Figure 3 is a family view of another leak of the invention) Figure 4 is a sectional view of part of Figure 3 cross-section of one of the screen rods of Fig. 4 138, in a smaller scale · The main points in Alen's known screens for drying clinto alleys (weight) is uniform, so that the solid is substantially free of water and is completely dried. · The present invention provides, in particular, a rotary screening device having both self-cleaning of the screen and cleaning with an external body such as a wiper. As a compound for wedding aola leaves purification methods, sun provides a sieve that is very effective in providing dry solids simultaneously for long periods of time. The special screening device 1a has a wide range of uses. It could be used in the purification of dirty and sewage water, in the separation of textile fibers from other tracks in Yas. The disclosed method and apparatus can be used in poultry care, vegetable processing, food processing, meat packaging and many butter applications where a solid from a liquid is desired. The operating leakage dictates the rotational speed of the screen, the size of the gaps in adjacent screen bars, and other extracts in the method and apparatus.

The screening process uses a substantially rotating cylindrical screen that is suitably supported and suitably used. Liquid and solids are introduced from one side of the screen. As the screen rotates, the solid tends to move to the other side and water down through the screen openings. Once the solids are removed, the water goes from the outside of the sieve to the inside and then from the inside again to the outside. Passing the sieve from the inside to the outside of the water removes any sieved solids from the wolf, thus creating a self-cleaning effect. Although the screen member may have many openings, it is preferably in the leakage of a plurality of rods or a single rod positioned as a coil in such a way that as the screen rotates, the coil helps guide the separated solids toward the screen discharge side.

Of particular importance is the screen itself structure. The screen is preferably made of parallel bars which are supported in a suitable manner and placed perpendicular to the screen axis. The rods preferably have a wedge-shaped cross-section, although it may have other shapes. Each rod has an outer surface of 5 57215 and the wedge-shaped cross-section has inwardly converging side surfaces which terminate immediately adjacent to the outer surface. The angle formed by the line perpendicular to the oblique side surface and the outer surface is preferably greater than about 7 ° and less than n · 45 °. · The relationship between the diameter of the screen and the size of the bar is important. The screen la should have a minimum diameter of about 280 mm and and the ratio of the screen diameter to the radial thickness of the bar should be greater than about 73 ·

It has been found that if the above-mentioned angle is less than about 7 °, then the porous material to be separated is trapped between the rods. Such a porous or spongy substance is difficult to remove by the rinsing effect of the water passing through the sieve. If, on the other hand, the angle is too large, greater than 45 °, the strength of the rod decreases so much that the screen is no longer rigid enough to withstand normal use. In addition, since the screen self-cleans itself with the aid of anodized water, it is preferable to keep the openings inside the screen wide enough to lead the screen cleaning water outside the screen. When the angle is too small, the wedge-like rods do not collect enough water and therefore do not have a sufficient cleaning effect. million at initial flow rate. Within three days, the flow rate had dropped to 930 l / min. because the screen was not self-cleaning due to the small angle between adjacent rods. A similar screen with a screen bar angle of about 13 ° operated for more than 60 days at a constant flow rate.

The relationship between screen size and screen diameter and rod thickness is also important. If the cleaning water does not have a large enough free fall to rinse the sieve, the sieve does not have the necessary self-cleaning effect.

The front end of the cylindrical screen drum 80 shown in Figures 1 and 2 may be supported on bearings 82 with its rear end supported on a drive 84 using it.

The screen support structure may consist of rails 86 placed on opposite sides thereof and suitably positioned on cross-members 88.

The structure of Figures 1 and 2 has a substantially horizontal axis. On the other side of the screen there is a distribution box 90 into which the liquid and solids come from the pipe 92. The distribution box 90 has two sides, one of which is indicated by the number 94 * the front part 96 and the back part. The junction box actually forms a tank for the incoming flow of liquid and solids.

The distribution box 90 is, as shown in particular in Figure 1, substantially the entire length of the screen 80. There is preferably a small space between the sides 94 of the junction box and the ends of the screen 80. Slightly inwards from the sides 94, guide plates 97 can be placed to limit and direct the liquid to the screen. As shown in Figure 2, the junction box is located approximately on the other side of the screen

4 5721S

along the axis. The device also has a wiper (scraper) 98, the lower edge of which rests on the surface of the screen, as described in connection with the embodiments of the invention. The wiper 98 may be integral with the junction box or may be separate and may be at different costs relative to the screen axis. For example, a plane passing through the axis of the sieve and wiped parallel can form with the horizontal about 10-30 ° to the fish.

On the opposite side of the screen of the distribution box 90, a pallet-wiper assembly 100 rests on supports 102. The pallet is arranged to receive the dried solid.

When the device is operating, the liquid and solids are fed from the pipe 92 to the distribution box 90. As the screen rotates slowly, the screen surface receives liquid and solids from the top surface of the accumulation in the distribution box. As the screen rotates, the solids carry solids to the pallet as 100 liquid flows through the screen, cf. from Figure 2. The solids collected on the pallet 100 can be removed in a suitable manner. Importantly, as shown in particular in Figure 2, the separated liquid as it drops through the screen tends to focus on the right side of the screen in Figure 2 and thus forms a column of liquid that cleans the portion of the screen moving towards the open top of the distribution box 90. The placement of the junction box on the other side of the screen tends to concentrate the liquid flowing through the screen to absorb this clean-up effect 1.

In Figure 3, the screen drum 110 may be substantially horizontal with the junction box labeled 112 and the screen drive 114. The combination comprising the distribution box 112, the drive 114 and the screen 110 can be mounted on a suitable container or the like 116. The container may have an outflow opening 118. The solids receiving station, i.e. the scraper structure, is indicated by reference numeral 120 and is located in the distribution box 112 on the opposite side of the screen or cylinder 110. At the right end of the screen there may be a tie rod or spindle 122 on which a shaft 124 is mounted, which is mounted on the cover structure 866. The opposite end of the cylinder can be mounted in a similar manner even when a drive is connected to it.

Solid restriction plates 128 and 130 may be placed on opposite ends of the screen and may be suitably attached to the junction box 112, e.g., as indicated at 132. A channel or trough bounded by the plates 128 and 130 is manually formed to guide solids as they pass from the junction box over the screen. for a combined demolition and scraping device 120.

The scraper device 120 may be movable or adjustable and the device 134 is used for this purpose.

The screen bars can run in the circumferential direction, i. substantially perpendicular to the axis of the screen. In this case, separate ring bars 138 are used, which are shown in Fig. 4 And each of which is supported by and connected to longitudinally fitted, generally straight bars 140.

57215

As noted above, the size, shape, and arrangement of the individual screen rods is very important.

Referring in particular to Figure 5, there is a typical ring 138 in cross section and designated 142. It has an outer surface 144 having a width marked V. Immediately adjacent each outer surface 144 are inwardly converging side surfaces 146 having a height, i.e., radial thickness of the rod, marked Hilla. The inner surface 148 of each rod 142 may be curved. The invention is not limited to bars having converging or oblique sides which are the entire distance H. In some applications, the oblique sides may end before the innermost part of the rod and the rest of the sides may be parallel. In either case, the mutual dimension of the rods 142 is important. It has been found that the ratio Iin to Vtn (HsV) must be greater than 1 and less than 2, in order for the screen to have the necessary self-cleaning properties and sufficient strength for its bars.

The angle (a) formed by a substantially perpendicular line between the inwardly oblique sides 146 and the outer surface V must be greater than about 7 ° and less than about 4 ° ° · It has been found that when this angle is about 7 ° smaller, the outer openings between the bars the solid porous material that has passed through the parts tends to trap between the rods. On the other hand, when the angle is greater than about 7 °, the porous or spongy substance does not pack, but the water tends to pass through the sieve, leaving free, unobstructed openings for filtering and screening the liquid-Klin mixture · If the angle is purple, i. above about 45 ° i the screen itself is weakened too much due to the pedal sliding shape of the bars, which causes a shortening of the life of the device. For these reasons, these limits are important, and screens whose rod ratios are outside these limits do not satisfactorily fulfill the function assigned to them.

Or the angle (α) is described to be greater than about 7 ° and less than about 43 °, it is to be understood that the angle between the extensions of adjacent sides of the bars is greater than about 14 ° and less than about 90 °. This said angle may be formed by adjacent bars with symmetrical sides, or by adjacent bars with asymmetrically set sides.

The side 146 is described as forming a special angle with the outer surface 144 with a line (straight) perpendicular. It should be noted that the page 146 may have a convex or concave shape and that this structure is still still within the scope of the invention. What is important is the size and shape of the openings between the forges, and this can come in the form of somewhat varying sides of the bar, all of which should have the basic angle ratio described.

The attachment of the individual bars to the support structure may be different. Spaced support arms may be used, as shown herein, or the support structure below. The bars can be fastened by welding, epoxy or other adhesives with mechanical fasteners, etc. The special fastening method or support structure is not important, as long as the required structural integrity and the required strength for the operation of the device are obtained. In a satisfactory form of a rod of the support structure 144 and the outer surface of the support structure outside of the minimum clearance, the V / 2.

In the manufacturing process, the actual shape of the cylinder is slightly polygonal, as flat areas are created between adjacent rods during welding or gluing. Although the shape becomes slightly polygonal, the screen can nevertheless be considered essentially cylindrical.

As shown in particular in Figure 5, the interface 150 between the outer surface 144 and the adjacent oblique sides 146 may be slightly rounded. This is only due to fabrication and does not substantially change the relationship between these surfaces.

In some embodiments of the invention, the front or outer end of the screen may be closed to prevent outflow of liquid. The plug can be loosely fitted so that it can be removed for inspection or maintenance of the device.

The invention is particularly advantageous in the treatment of sewage when storm flooding becomes a problem. The hard water rinse the sewers clean, removing the grease and fibers that have accumulated in them. Screens without self-cleaning members quickly clog in flood situations caused by heavy rainfall. Since the present invention has both self-cleaning and continuous cleaning with a wiper or scraper, the screen remains open and the mass of separated solids remains uniform, indicating that there is no water in the solid.

The rotational speed of the screen may be different in different applications. A linear velocity of approx. 76 mm / s has been found to be satisfactory in sewage treatment. When separating Tequilli cults or meat packaging waste, other rates may be appropriate. In general, speeds of 25-500 mm / s are satisfactory. In some situations, the speed of the screen can be varied to accommodate variations in the solids load in the liquid.

Although a preferred embodiment of the invention has been described and illustrated herein, it should be noted that many modifications, substitutions, and alterations are possible therein.

Claims (3)

57215 Patent Requirements: 1. An apparatus for drying and separating mainly porous or spongy solids from sewage, liquid used in the food industry, meat packaging, etc., comprising a cylindrical screen (80, 110) having a screening element 142 on its outer circumference consisting of circumferentially spaced tongues surrounding a substantially open interior with a screening element having a diameter of at least 280 mm so as to cause a substantially free liquid to fall, causing the liquid to strike the bottom area of the screening element with considerable force, means (116) for supporting the screening element as it rotates and means (114) a distribution box (112) containing a mixture of solids and liquids to be separated and opening against the screening element at a point above the plane passing through this axis, adjacent to the top surface of the screening element of the solids remover (120) and away from the distribution box. in the direction of rotation of the screening element, wherein the screening element moves to move the separated solids towards the solids outlet as the liquid passes through the screening element and falls freely into its bottom area, each bar the adjacent solids are conveyed to the solids remover, characterized in that the rods have inwardly converging sides (146) which form downwardly opening separation slots in the upper part of the falling liquid column and upwardly opening liquid collecting bottom and that the side of one rod forms an angle of about 14 ° greater and about 90 ° less with the opposite side of the adjacent bar than the diameter of the screen and the radial thickness of the bar with a ratio of at least about 75. Device according to Claim 1, characterized in that the angle between the opposite sides of the adjacent bars is 26 °. Device according to claim 1, characterized in that the distance between the bars is even from one end of the screening element to the other.