Air chamber installed in the under-net air chamber type wet specific gravity separator

Abstract

To provide an air chamber installed in a pulsation chamber of an under-screen type wet specific gravity classifier, the air chamber being capable of efficiently collecting a desired substance to be collected.SOLUTION: Provided is an air chamber including: a casing including a tubular peripheral wall and a roof arranged in an upper end of the peripheral wall; a flow entrance arranged near the upper end of the peripheral wall for taking air into and out from the air chamber; an upper stopper arranged near an upper end of the inside of the peripheral wall; a lower stopper arranged near a lower end of the inside of the peripheral wall; and a floating body capable of sliding between the upper stopper and the lower stopper in the inside of the casing.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention generally relates to the field of under-screen air chamber type wet specific gravity separators. More specifically, the present invention relates to an air chamber installed in a under-screen air chamber type wet specific gravity separator. [Background technology]

[0002] A screen-under-air-chamber-type wet specific gravity separator is known as a machine that selectively recovers high-quality coal from raw coal. The operating principle of the screen-under-air-chamber-type wet specific gravity separator will be briefly described with reference to FIG. 6. In the screen-under-air-chamber-type wet specific gravity separator, a sorting chamber in which the material to be sorted (hereinafter referred to as "material to be sorted") is placed is located at the top, a pulsation chamber filled with water is located at the bottom, and a mesh is arranged between the sorting chamber and the pulsation chamber. An air chamber for letting air in and out is arranged in the pulsation chamber, and the water level in the air chamber can be raised and lowered by raising and lowering the water level in the air chamber by letting air in and out. Then, by applying an appropriate water pulsation to the material placed in the sorting chamber, layers of material by specific gravity are formed in the sorting chamber.

[0003] In order to improve the sorting efficiency of the material in the under-screen air chamber type wet specific gravity separator, the water flow applied to the material needs to be regular with as little turbulence as possible. In other words, if the water flow is turbulent, the sorting efficiency of the material will decrease. To avoid this situation, measures have been taken in the past, such as providing a straightening plate near the screen or placing lagging material in the sorting chamber. Summary of the Invention [Problem to be solved by the invention]

[0004] However, measures such as straightening vanes and lagging materials do not sufficiently alleviate the turbulence of the water flow applied to the materials to be sorted, which poses the problem that it is not possible to prevent a decrease in the sorting efficiency of the materials to be sorted.

[0005] The present invention was developed in consideration of the above circumstances, and aims to provide an air chamber to be installed in an under-mesh air chamber type wet specific gravity separator that can efficiently recover the desired recovered material. [Means for solving the problem]

[0006] The air chamber installed within the pulsation chamber of the under-screen air chamber type wet specific gravity separator described in claim 1 of the present application is characterized in that it comprises a casing having a cylindrical peripheral wall and a roof located at the upper end of the peripheral wall, an inlet and outlet located near the upper end of the peripheral wall for letting air in and out of the air chamber, an upper stopper located near the upper end of the inside of the peripheral wall, a lower stopper located near the lower end of the inside of the peripheral wall, and a float capable of sliding inside the casing between the upper stopper and the lower stopper.

[0007] The air chamber installed in the under-screen air chamber type wet specific gravity separator described in claim 2 of the present application is characterized in that in the air chamber of claim 1, the float is formed from a material having a specific gravity of 1.0 or less.

[0008] The air chamber installed in the under-screen air chamber type wet specific gravity separator described in claim 3 of the present application is characterized in that in the air chamber of claim 1 or 2, the roof is conical, and the angle between the generatrix of the cone and the horizontal plane is 110° to 130°. Effect of the Invention

[0009] According to the present invention, the float uniformly pushes out and draws in the water in the casing, thereby minimizing turbulence in the water flow and improving sorting accuracy. In addition, by forming the float from a material with a specific gravity of 1.0 or less, air can be quickly pressurized into the float. Furthermore, by making the roof of the casing conical, turbulence in the water flow can be further reduced. [Brief description of the drawings]

[0010] [Figure 1] 1 is a schematic diagram showing an entirety of a mesh-under-air-chamber-type wet specific gravity separator in which an air chamber according to a preferred embodiment of the present invention is installed. [Diagram 2] FIG. 2 is an enlarged view of portion 2 of FIG. [Diagram 3] 3(a) is a view taken along line 3a-3a in FIG. 2, FIG. 3(b) is a view taken along line 3b-3b in FIG. 2, and FIG. 3(c) is a view taken along line 3c-3c in FIG. [Figure 4] FIG. 13 is a diagram showing the state in which a floating body is installed in an air chamber. [Diagram 5] 1 is a series of diagrams for explaining the operation of a mesh-under-air-chamber-type wet specific gravity separator equipped with an air chamber of the present invention. FIG. [Figure 6] FIG. 2 is a diagram for explaining the operating principle of a mesh air chamber type wet specific gravity separator. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Next, the air chamber installed in the mesh air chamber type wet specific gravity separator according to the preferred embodiment of the present invention will be described in detail with reference to the drawings. Fig. 1 is a schematic diagram showing the entirety of the mesh air chamber type wet specific gravity separator in which an air chamber is installed, and Fig. 2 is an enlarged view of the air chamber and its surrounding area. In Fig. 1, reference characters A, B, and C respectively indicate the sorting chamber into which the material to be sorted is introduced, the pulsation chamber filled with the sorting medium (e.g. water), and the mesh installed at the boundary between the sorting chamber and the pulsation chamber.

[0012] An air chamber according to a preferred embodiment of the present invention, generally designated by reference numeral 10 in Figures 1 and 2, is disposed at a predetermined position within the pulsation chamber B and includes a casing 12. The casing 12 has a cylindrical peripheral wall 12a and a roof 12b disposed at the upper end of the peripheral wall 12a. The casing 12 has an upper end closed by the roof 12b and an open lower end 12c.

[0013] An inlet / outlet port 14 for letting air in and out of the air chamber 10 is provided near the upper end of the peripheral wall 12a of the casing 12. One end of an inlet / outlet pipe 16 for letting air in and out is connected to the inlet / outlet port 14, and the other end of the inlet / outlet pipe 16 is connected to an air source (not shown) for supplying air into the casing 12 and discharging air from the casing 12.

[0014] An upper stopper 18 is disposed near the upper end of the inner peripheral wall 12a of the casing 12, and a lower stopper 20 is disposed near the lower end of the inner peripheral wall 12a of the casing 12. A float 22 is disposed between the upper stopper 18 and the lower stopper 20 inside the casing 12. The float 22 has a disk-like shape with a diameter slightly smaller than the inner diameter of the casing 12, so that the float 22 can slide inside the casing 12 between the upper stopper 18 and the lower stopper 20. Although Figs. 3a and 3b respectively show the planar shapes of the upper stopper 18 and the lower stopper 20, the upper stopper 18 and the lower stopper 20 are not limited to the shapes shown in the drawings as long as they function as stoppers for the float 22.

[0015] Preferably, the float 22 is made of a material with a specific gravity of 1.0 or less (e.g., polystyrene foam, urethane foam). If the float 22 is made of a material with a specific gravity of 1.0 or less, the float 22 will always float on water, and no water will exist above the float 22. This allows air to be pressurized into the float 22 quickly.

[0016] Fig. 4 is a diagram showing the state in which the float 22 is installed in the air chamber 10. The float 22 can be easily installed by inserting it into the casing 12 at an angle from the opening at the lower end 12c of the casing 12, as shown in Fig. 4.

[0017] The operation of the air chamber 10 configured as above will be described with reference to Fig. 5. Fig. 5(a) shows a state in which the material to be sorted is put into the sorting chamber A, the top surface of the float 22 is in contact with the upper stopper 18, and the sorting chamber A, the pulsation chamber B, and the air chamber 10 below the float 22 are filled with water. When the under-net air chamber type wet specific gravity separator is started, air supplied from the air source flows into the air chamber 10 from the inlet / outlet 14 through the inlet / outlet pipe 16. Then, the float 22 is pushed down inside the casing 12 by the inflowing air, and pushes out the water located below the float 22 from the casing 12 (Fig. 5(b)). The float 22 is pushed down until it hits the lower stopper 20, and the water pushed out from the casing 12 hits the bottom of the pulsation chamber B and becomes an upward flow (Fig. 5(c)). The upward flow passes through mesh C and flows into sorting chamber A, and raises the materials to be sorted (marked with circles and triangles starting from the highest specific gravity) that are mixed in sorting chamber A (Fig. 5(d)). Next, when air is sucked in from the air source, the air located above the float 22 in the casing 12 is sucked in through the inlet / outlet 14 and the outlet / inlet pipe 16. The float 22 then rises in the casing 12 until it hits the upper stopper 18, and a downward flow is generated in sorting chamber A and pulsating chamber B (Fig. 5(e)). In this way, by sucking air in and out of the casing 12, a pulsating flow is generated in sorting chamber A in which upward and downward flows alternate, and layers of materials by specific gravity are formed in sorting chamber A (Fig. 5(f)).

[0018] As described above, by using the float 22 to uniformly push out and draw in the water within the casing 12, turbulence of the water flow can be avoided as much as possible.

[0019] The air chamber 10 equipped with the float 22 may be used alone or in combination with a baffle plate and / or lagging material.

[0020] It is preferable to form the roof 12b of the casing 12 into a conical shape. Through various experiments conducted by the inventors, it was found that turbulence of the pulsating flow is reduced when the angle α (see FIG. 2) between the generatrix of the conical roof 12b and the horizontal plane is set to 110° to 130°.

[0021] The present invention is not limited to the above-described embodiments of the invention, and various modifications are possible within the scope of the invention described in the claims, and it goes without saying that these modifications are also included within the scope of the present invention.

[0022] For example, the dimensions and details of each component A, B, and C of the under-sieve air chamber type wet specific gravity separator shown in the attached drawings, as well as the dimensions and details of the air chamber 10, are merely illustrative and are not limited to those shown in the drawings. [Explanation of symbols]

[0023] 10 Air chamber 12 Casing 12a Peripheral wall 12b Roof 12c bottom end 14 Air inlet / outlet 16 Air inlet / outlet pipe 18 Upper stopper 20 Lower stopper 22 Floating Body A Sorting Room B Pulsating chamber C. Mesh

Claims

1. An air chamber installed in a pulsation chamber of a mesh air chamber type wet specific gravity separator, a casing having a cylindrical peripheral wall and a roof disposed at an upper end of the peripheral wall; an inlet / outlet port disposed near an upper end of the peripheral wall for letting air in and out of the air chamber; an upper stopper disposed near an upper end of the inner side of the peripheral wall; a lower stopper disposed near a lower end of the inner side of the peripheral wall; a float that can slide inside the casing between the upper stopper and the lower stopper; An air chamber comprising:

2. 2. The air chamber according to claim 1, wherein the float is made of a material with a specific gravity of 1.0 or less.

3. 3. The air chamber according to claim 1, wherein the roof is conical, and an angle between the generatrix of the cone and a horizontal plane is 110° to 130°.

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