Rotary film grading device with rectangular tray

Abstract

The utility model provides a rotary film grading device with rectangular trays, which comprises a rotary frame connected with a rotating mechanism and a suspension liquid feeding box, and the rotary frame is provided with a plurality of rectangular trays inclined downwards in the length direction along the circumferential direction; the suspension liquid feeding box is located on the inner side of the width side of the top of the rectangular tray, and the collecting channels are located on the outer side and the bottom of the rectangular tray. According to the technical scheme, the inclined rectangular trays are installed on the rotating frame, the inclined planes of the inclined trays can generate feeding suspension liquid films flowing along the length of the trays, particles can be layered better by driving the rotating frame to rotate and superposing centrifugal force, the limitation of a traditional film classifier is broken through, and the effect of classifying the particles is achieved. Separation time can be increased, quality of particle classification is improved, and stratification of smaller and lighter particles is allowed.

Description

Technical Field

[0001] The utility model relates to a grading device, in particular to a rotary film grading device with a rectangular tray. Background Art

[0002] The classification of solid particles in suspension based on size and density is an important process in many industries. One example is the separation of different agglomerated particles based on density in recycling technology. Other applications include separating heavier granular sludge from lighter flocculent material in biological wastewater treatment or separating valuable minerals from waste rock in mining.

[0003] Membrane separation processes are widely used to classify particles in a flowing film. They utilize a combination of gravity, the resistance between the particles and the underlying surface, and optional external forces to separate particles according to their mass. Spatial separation is then used to separate the suspension into fractions with varying average particle sizes or densities.

[0004] Existing membrane equipment types include troughs and conical separators, shakers, and spiral separators. Flumes and conical separators produce vertical stratification, separating particles into vertical thin film layers. Spiral classifiers utilize gravity to generate membrane flow within a spiral channel. The primary challenge with existing membrane classifiers is their short hydraulic retention time. Particles that settle slowly due to size or density do not have sufficient time to settle and are therefore swept away. To improve the separation of small and light particles in the flume, the membrane depth must be reduced, but this prevents vertical component separation. For shakers, improving the separation of small and light particles in the flume requires increasing the worktable width. However, the increased tray size makes the movable vibrating drive too heavy. Furthermore, the vibration mechanism creates minor turbulence, which can cause lighter, smaller particles to resuspend. This inherently limits the separation points of the shaker. Utility Model Content

[0005] In response to the above technical problems, the utility model discloses a rotating film grading device with a rectangular tray, which increases the separation time, improves the quality of particle grading, and achieves the separation of particles with smaller particle size and lower density than the existing technology.

[0006] To this end, the technical solution of the present utility model is:

[0007] A rotary film grading device with rectangular trays comprises a rotating frame connected to a rotating mechanism, a suspension feed box, and a collection channel. The rotating frame is circumferentially provided with a plurality of identical rectangular trays, each tilted downward in its longitudinal direction. The suspension feed box is located on the inner width side of the top of the rectangular tray, and the collection channel is located on the outer side and bottom of the rectangular tray. The "downward tilt in the longitudinal direction" refers to the rectangular trays being tilted downward only in their longitudinal direction, with their widths being radially arranged toward the axis of rotation and not tilted.

[0008] With this technical solution, the suspension feed box is set on the inner side of the top width side of the rectangular tray. The rectangular tray is set at an angle. After the suspension is fed, a feed suspension film is formed along the inclined surface that flows along the length of the tray. By driving the rotating frame to rotate, the material on the rectangular tray is superimposed with an independent secondary centrifugal force. Compared with traditional classifiers, this solution has a wider ratio between secondary and primary separation forces. The centrifugal force is a function of the distance from the rotation axis. Therefore, the secondary force at the beginning and end of the rectangular tray is higher than that in the center. The higher force at the beginning improves the film distribution on the tray, while the higher force at the end has a favorable flushing effect on the stratified particles, improving the classification quality and separating particles with smaller particle sizes and lower densities than before.

[0009] Furthermore, this technology uses multiple layers of trays stacked in a rotating frame, further increasing processing capacity and reducing installation footprint. The centrifugal force can be adjusted according to the quality of the feed by controlling the angular velocity (rotational speed).

[0010] As a further improvement of the present invention, it comprises a feed distributor, which is connected to each suspension feed box via a feed hose.

[0011] As a further improvement of the present invention, for each rectangular tray, the collection channel includes at least three collection areas, each of which is connected to a corresponding bottom collection channel via a pipe. Furthermore, the collection channel includes one or more tailings collection areas, one or more middlings collection areas, and a product collection area; each collection area is connected to a corresponding bottom collection channel via a pipe.

[0012] As a further improvement of the present invention, the aspect ratio of the rectangular tray is 2-6.

[0013] As a further improvement of the present invention, the width of the discharge port is 0.1-0.4 times the width of the rectangular tray.

[0014] As a further improvement to the present invention, the surface of the rectangular tray is provided with a coating or lining to increase frictional resistance. Furthermore, the surface roughness of the coating or lining is between that of steel and dull wood. In this technical solution, the surface coating or lining can be used to increase the drag coefficient between the surface and the particles. This facilitates the formation of laminar flow conditions and increases the vertical velocity gradient. The greater the vertical velocity gradient, the better the particle stratification effect. The coating and lining are particularly suitable for particles with small differences in fluid density.

[0015] As a further improvement to the present invention, the rectangular tray has a surface patterned with raised dots or corrugated patterns. This textured surface can slow the radial movement of heavy particles, improving the release of aggregates and the washout of light particles, which is particularly useful for high concentrations of light particles.

[0016] As a further improvement to the present invention, the rotary thin film classifier with a rectangular tray includes a flushing water addition mechanism, the outlet of which is located on the inner side of the rectangular tray. This technical solution improves the radial movement of lighter particles, making it particularly suitable for high-concentration suspensions. On the rectangular tray, the flushing water can take advantage of the lower centrifugal force in the middle of the tray, allowing for a higher flushing water flow.

[0017] As a further improvement of the present invention, the water outlet of the flushing water adding mechanism is located in the middle of the inner side of the rectangular tray.

[0018] As a further improvement of the present invention, the rotary film grading device with rectangular trays comprises multiple layers of rectangular trays, with each layer having 2 to 6 rectangular trays. Furthermore, the rectangular trays in each layer are evenly distributed.

[0019] As a further improvement of the present invention, a plurality of rectangular pallets are mounted on a rotating frame, and according to the required processing capacity and the slope of the pallets, the rectangular pallets are grouped in an equal-level layer array with three to six pallets on each layer.

[0020] Multiple layers of pallets can be stacked in a rotating frame to further increase handling capacity and reduce the installation footprint.

[0021] As a further improvement of the present invention, the rotating frame is provided with a rotating beam, and the rectangular tray is obliquely hung on the rotating beam;

[0022] Alternatively, the rotating frame may be provided with a supporting structure on which a plurality of downwardly inclined placement members are circumferentially arranged, and the rectangular tray is positioned on the placement members. Further, a rotating frame on wheels may be used, whereby the tray rests on a supporting structure.

[0023] As a further improvement of the present invention, the rotating frame is connected to the rotating mechanism.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] First, the technical solution of the utility model is to install multiple inclined rectangular trays on the rotating frame, wherein the design of the inclined surface of the inclined tray can produce a feed suspension film flowing along the length of the tray. By driving the rotating frame to rotate and superimposing the centrifugal force, the particles can be better stratified, breaking the limitations of traditional film classifiers, increasing the separation time, improving the quality of particle classification, and allowing the stratification of smaller and lighter particles.

[0026] Secondly, the technical solution of the present invention can be used to adjust the centrifugal force according to the mass of the feed suspension by controlling the angular velocity (rotational speed). Compared with traditional classifiers, this allows the application of a wider range of ratios between secondary and primary separation forces. The centrifugal force is a function of the distance from the axis of rotation. Therefore, the secondary centrifugal force is higher at the beginning and end of the tray compared to the center part. The higher centrifugal force at the beginning improves the film distribution on the tray, while the higher centrifugal force at the end has a favorable scouring effect on the stratified particles, which is particularly suitable for organic particles.

[0027] Third, the technical solution of the present invention can further increase the resistance coefficient between the surface and the particles by improving the surface design of the tray, such as coating or lining, which is conducive to the formation of laminar flow conditions and the increase of the vertical flow velocity gradient. The larger the vertical flow velocity gradient, the better the particle stratification effect. Coatings and linings are particularly suitable for particles with small fluid density differences. Textured trays can be used to slow down the radial movement of heavy particle components, improve the release of agglomerates and the washing out of light components, which is especially suitable for high-concentration light component particles. In addition, the application of flushing water can improve the radial movement of lighter particles, which is particularly suitable for high-concentration suspensions. On a rectangular tray, the flushing water can take advantage of the lower centrifugal force in the middle of the tray, allowing a higher flushing water flow. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of a rectangular tray in Example 1 of the present utility model.

[0029] Figure 2 This is a schematic diagram of the motion analysis of particles on the rectangular tray of Example 1 of the present utility model.

[0030] Figure 3 Schematic diagram of the analysis of the rectangular tray of Example 1 of the present invention.

[0031] Figure 4 It is a top view of a rotary film grading device with a rectangular tray according to Example 1 of the present invention.

[0032] Figure 5 It is a top view of a rotary film grading device with a rectangular tray according to Example 2 of the present invention.

[0033] Figure 6 It is a partially enlarged view of a rotary film grading device with a rectangular tray according to Example 2 of the present invention.

[0034] Figure 7 It is a structural schematic diagram of a rotary film grading device with a rectangular tray according to Example 2 of the present invention.

[0035] Figure 8 It is a top view of a rotary film grading device with a rectangular tray according to Example 3 of the present invention.

[0036] Figure 9 Schematic diagrams of the structure of the surface texture of a rectangular tray according to Example 4 of the present invention; (a) to (f) are schematic diagrams of rectangular trays with different surface textures.

[0037] Reference numerals include:

[0038] 1-rotating frame, 2-suspension feed box, 3-rinsing water adding mechanism, 4-feed distributor, 5-speed change curve;

[0039] 110-rectangular tray, 121-tailings collection area, 122-middlings collection area, 123-product collection area;

[0040] 131-support member, 132-mounting member;

[0041] 301-feed hose, 302-tailings drainage pipe, 303-mid-mine drainage pipe, 304-product drainage pipe, 305-tailings bottom channel, 306-mid-mine bottom channel, 307-product bottom channel. DETAILED DESCRIPTION

[0042] The preferred embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0043] Example 1

[0044] A rotary film grading device with rectangular trays, comprising a rotating frame 1 connected to a rotating mechanism, a suspension feed box 2, and a flushing water adding mechanism 3. The rotating frame 1 is provided with a plurality of identical rectangular trays 110 with their lengths tilted downwards along the circumference. Figure 1As shown, the slope of the rectangular tray 110 is β, the length is L, the width is B, and the aspect ratio is L / B=2-6. The suspension feed box 2 is located on the inner side of the top width side of the rectangular tray 110, the width of the discharge port of the suspension feed box 2 is b, and the width ratio of the suspension feed box 2 to the rectangular tray 110 is b / B=0.1-0.4. Collection channels are provided on the outside and bottom of the rectangular tray 110. On the outer edge, the collection channels are exemplarily shown, and the collection channels are, from top to bottom, a tailings collection area 121, a middling collection area 122, and a product collection area 123, which are used to collect tailings, middlings, and products, respectively. The length of each collection channel can be adjusted according to the quality of the suspension. The outlet of the flushing water addition mechanism 3 is located in the middle of the inner edge of the rectangular tray 110.

[0045] like Figure 2 The figure shows the relevant parameter analysis of a particle in an inclined rectangular tray 110, which has a width of B, a length of L, a slope of β, and rotates at an angular velocity ω and a radius r. The acceleration due to gravity is a g The rotation of the tray produces centrifugal acceleration, which results in a radial velocity vB. Therefore, the particle moves along a net distance x(t), with a longitudinal component of l(t) and a radial component of b(t). When the ratio of the longitudinal distance to the velocity is equal to the ratio of the radial distance (t = L / v L =B / v B ) is the time t required for a critical particle to move diagonally from the starting corner inside the tray to the end corner outside the tray. The required angular velocity ω can be calculated as the ratio of the square root of the ratio of the tray width to the radius to the total travel time (ω = (B / r)^0.5 / t). The typical angular velocity for a rectangular tray 110 thin film grader is ω < 1 Hz.

[0046] Figure 3 A tilted rectangular tray 110 is shown, with a width B and a length L. The radius between the axis and the center of the tray is r. The particle's starting radius is r0, and its radius at the end of its travel distance is r2, with r2 > r0 > r. Since the radial velocity component is a function of radius, the radial velocity varies and follows velocity curve 5. A flushing water addition mechanism 3 can be located in the middle of the lower radial velocity region. Flush water is added radially outward at a lower horizontal velocity by gravity flow.

[0047] Furthermore, the rotary thin film grading device with the rectangular tray 110 further includes a feed distributor 4 , and the feed distributor 4 is connected to each suspension feed box 2 via a feed hose 301 .

[0048] like Figure 4In the case where multiple rectangular trays 110 are arranged on each layer of the rotating frame 1, in this embodiment, there are three rectangular trays 110 on each layer. The rotating frame 1 is a hanging frame, which carries a support arm and a mounting part 132 for hanging the rectangular trays 110. The feed suspension is supplied to the feed separator 4, and at the same time, the rotating frame 1 is driven to rotate. The feed separator 4 flows the suspension to the corresponding suspension feed box 2 through each feed hose 301. The suspension in the suspension feed box 2 flows through the rectangular trays 110, and under the action of the centrifugal force of the rotation, the particles are layered and graded according to their mass. The tailings have the largest cross-flow velocity in the radial direction and are collected in the first section of the collection channel, that is, the tailings collection area 121. The intermediate distillate is collected in the mid-ore collection area 122. The product has the lowest cross-flow velocity in the radial direction and is collected in the product collection area 123. The tailings collection area 121 of each rectangular tray 110 is connected to the tailings bottom channel 305 through a pipe, the middling ore collection area 122 of each rectangular tray 110 is connected to the middling ore bottom channel 306 through a pipe, and the product collection area 123 of each rectangular tray 110 is connected to the product bottom channel 307 through a pipe.

[0049] Figure 4 An example tray with three collection channel sections is shown. The tailings collection area 121 is connected to a tailings drain pipe 302, the middlings collection area 122 is connected to a middling drain pipe 303, and the product collection area 123 is connected to a product drain pipe 304. Tailings from all rectangular trays 110 drain to a tailings bottom channel 305 on the non-rotating bottom plate, middlings drain to a middling bottom channel 306, and product drains to a product bottom channel 307.

[0050] In this embodiment, the length, slope, suspension concentration, water flow rate, etc. of the rectangular tray can be designed so that the conventional hydraulic retention time on the tray is 15-30 seconds, allowing the stratification time of small particles and light particles to be extended by 3-5 times.

[0051] Example 2

[0052] like Figure 5 、 Figure 6 and Figure 7As shown, based on Example 1, in this embodiment, each layer has 4 rectangular trays 110. The feed suspension is supplied to the suspension feed box 2 on each rectangular tray 110 through a feed hose 301. The suspension flows through the rectangular tray 110, and the particles are layered according to their mass. The tailings have the largest cross-flow velocity in the radial direction and are collected in the first section of the collection channel, namely the tailings collection area 121, and then discharged into the tailings bottom channel 305 through the tailings drainage pipe 302. The middle distillate is collected in the middling collection area 122 and discharged into the middling bottom channel 306 through the middling drainage pipe 303. The product has the lowest cross-flow velocity in the radial direction and is collected in the product collection area 123 and discharged into the product bottom channel 307 through the product drainage pipe 304.

[0053] Furthermore, the rotating frame 1 is provided with a support structure 131, on which a plurality of downwardly inclined mounting members 132 for hanging rectangular trays 110 are provided along the circumference. The rectangular trays 110 are hung on the mounting members 132. Furthermore, the rotating frame 1 can be used on wheels, whereby the rectangular trays 110 rest on the support structure.

[0054] Example 3

[0055] like Figure 8 As shown, based on embodiment 1, in this embodiment, each layer has five rectangular trays 110. The rectangular trays 110 on each layer are evenly distributed.

[0056] Furthermore, the rotating frame 1 is provided with a rotating beam, and the rectangular tray 110 is obliquely hung on the rotating beam.

[0057] Example 4

[0058] Based on the embodiment 1, embodiment 2 or embodiment 3, the difference of this embodiment is that the main flow velocity v m and width direction with secondary radial velocity v c The rectangular tray 110 can be designed with different texture surfaces. Figure 9 (a) to increase the friction between the surface and the particles; or Figure 9 (b) to improve the release of small particles; or Figure 9 (c) to slow down the flow of heavy particles; or Figure 9 (d) to improve separation as concentration increases; or Figure 9 (e) to break up the lumps; or Figure 9 (f) Curved cross channels are shown to improve the separation of light components.

[0059] In the description of the present invention, it should be understood that terms such as "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are orientations or positional relationships based on the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0060] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0061] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; they can refer to direct connection or indirect connection through an intermediate medium; they can refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0062] The specific implementation methods described above are preferred implementation methods of the present invention, and are not intended to limit the specific implementation scope of the present invention. The scope of the present invention includes but is not limited to the specific implementation methods. All equivalent changes made in accordance with the shape and structure of the present invention are within the scope of protection of the present invention.

Claims

1. A rotary film grading device with a rectangular tray, characterized by: It includes a rotating frame and a suspension feed box for connecting to a rotating mechanism. The rotating frame is provided with a plurality of rectangular trays inclined downward in the length direction along the circumference; the suspension feed box is located on the inner side of the top width side of the rectangular tray, and the collection channel is located on the outer side and bottom of the rectangular tray.

2. The rotary film grading device with a rectangular tray according to claim 1, characterized in that: The collecting channel of each rectangular tray includes at least three collecting areas, and each collecting area is connected to the corresponding bottom collecting channel through a pipeline.

3. The rotary film grading device with a rectangular tray according to claim 1, characterized in that: The aspect ratio of the rectangular tray is 2-6.

4. The rotary film grading device with a rectangular tray according to claim 3, characterized in that: The width of the discharge port of the suspension feed box is 0.1-0.4 times the width of the rectangular tray.

5. The rotary film grading device with a rectangular tray according to claim 1, characterized in that: The surface of the rectangular tray is provided with a coating or a lining for increasing friction resistance.

6. The rotary film grading device with a rectangular tray according to claim 1, characterized in that: The surface of the rectangular tray is provided with raised wave dots or corrugated textures.

7. The rotary film grading device with a rectangular tray according to claim 1, characterized in that: It comprises a flushing water adding mechanism, the water outlet of which is located in the middle of the inner side of the rectangular tray.

8. The rotary film grading device with a rectangular tray according to any one of claims 1 to 7, characterized in that: It comprises multiple layers of rectangular trays, with each layer having 2 to 6 rectangular trays; the rotating frame is connected to the rotating mechanism.

9. The rotary film grading device with a rectangular tray according to any one of claims 1 to 7, characterized in that: The rotating frame is provided with a rotating beam, and the rectangular tray is obliquely hung on the rotating beam; or the rotating frame is provided with a supporting member, and a plurality of downwardly inclined placement members are provided on the supporting member along the circumference, and the rectangular tray is located on the placement member.

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