Powder storage and supply tank

Abstract

To provide a powder storage / supply tank capable of uniformly storing powder in the tank and smoothly introducing and discharging the powder into and from a table feeder. [Solution] A powdered material storage and supply tank having a powdered material storage section 2 for storing powdered material and a discharge section 3 at the bottom for discharging the powdered material, the discharge section being equipped with a table feeder 4 and an air supply mechanism 5 for supplying high-pressure air to the inside of the powdered material storage section, the air supply mechanism having a high-pressure air supply source 51 and an air nozzle 54 provided toward the inside of the powdered material storage section.

Description

[Technical field]

[0001] The present invention relates to a powder storage and supply tank. [Background technology]

[0002] In powder and granular material storage tanks that store and supply powders and granular materials, table feeders have traditionally been installed in the discharge section at the bottom. A table feeder is a device installed to quantitatively discharge the mixed powder and granular materials that have been charged into the powder and granular material storage tank.

[0003] On the other hand, for example, when the powder introduced into the storage tank is a mixture of multiple types of powder with different particle sizes, specific gravities, shapes, etc., the mixed state in the storage tank may become uneven depending on the charging conditions, storage conditions, etc., and the particle size and components may vary when discharged. In addition, there are problems such as fine particles adhering to the inner wall surface near the discharge part at the bottom of the storage tank, forming bridges, making it difficult to smoothly introduce powder in a uniform state into the table feeder.

[0004] To address such problems, a hopper feeder equipped with a scraper that rotates along the inner wall surface of the hopper has been proposed (Patent Document 1). This proposed hopper feeder is said to be able to remove bridges that have formed on the inner wall surface of the hopper by rotating the scraper along the inner wall surface of the hopper. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2019-137487 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, although the above proposed hopper feeder can remove fine particles adhering to the wall surface and is effective in eliminating bridges, it is difficult to achieve a uniform mixture of the powder and granular materials in the hopper.

[0007] The present invention was made in consideration of the above circumstances, and its objective is to provide a powder storage and supply tank that can keep the powder in a uniform state inside the tank and enable smooth introduction and discharge into a table feeder. [Means for solving the problem]

[0008] The present invention has been made to solve the above technical problems and has the following features: [1] A powder / granular material storage / supply tank having a powder / granular material storage section for storing powder / granular material and a discharge section at a lower part for discharging the powder / granular material, The discharge section is provided with a table feeder, and an air supply mechanism is provided for supplying high-pressure air to the inside of the powder / granular material storage section, The air supply mechanism has a high-pressure air supply source and an air nozzle facing toward the inside of the powder / granular material storage section. [2] The powder / granular material storage and supply tank of [1], wherein the high-pressure air supply source is an air compressor and a plurality of air nozzles are provided. [3] A powdered or granular material storage and supply tank according to [1] or [2], which enables the air supply mechanism and the table feeder to operate simultaneously. Effect of the Invention

[0009] According to the powder storage and supply tank of the present invention, the powder in the storage and supply tank can be kept uniform, and can be smoothly introduced into and discharged from the table feeder. [Brief description of the drawings]

[0010] [Figure 1] 1 is a schematic cross-sectional view showing one embodiment of a powder / granular material storage and supply tank according to the present invention. [Diagram 2] FIG. 4 is a schematic top view of another embodiment of the powder storage and supply tank of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] The powdered material storage and supply tank of this invention is a powdered material storage and supply tank having a powdered material storage section for storing powdered material and a discharge section for discharging the powdered material from the bottom, and is equipped with a table feeder in the discharge section and an air supply mechanism above the table feeder for supplying high-pressure air toward the inside of the powdered material storage section.

[0012] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a powder / granular material storage / supply tank according to the present invention will be described in detail with reference to the drawings. Fig. 1 is a schematic cross-sectional view showing one embodiment of a powder / granular material storage / supply tank according to the present invention, and Fig. 2 is a schematic top view.

[0013] The powdered material storage and supply tank 1 according to this embodiment has a powdered material storage section 2 for storing powdered material, and a discharge section 3 for discharging the powdered material from the bottom. The powdered material storage section 2 has a cylindrical section 21 having a cylindrical shape at the top, and an inverted cone section 22 having a mortar shape with a diameter decreasing downward from the middle section, and the discharge section 3 is provided at the bottom end of the inverted cone section 22.

[0014] The powder or granular material stored in the powder or granular material storage section 2 is not particularly limited as long as it is a powder or granular material that can be discharged from the discharge section 3 and introduced into the table feeder 4, and examples thereof include the main ingredients of compound feed and fertilizer, cement, resin materials, short fiber materials, wood chips, etc., as well as mixtures of these materials.

[0015] In the powdered or granular material storage and supply tank 1 of this embodiment, a table feeder 4 is provided at the lower discharge section 3 of the powdered or granular material storage section 2. The table feeder 4 is a device that quantitatively discharges the powdered or granular material stored in the powdered or granular material storage section 2 in a well-mixed state. The table feeder 4 used in this invention is not particularly limited as long as it is capable of mixing and quantitatively discharging, and any commonly known table feeder can be used.

[0016] The table feeder 4 has a motor 41 as a drive source, an upper impeller 43 which rotates connected to a drive shaft 42 vertically installed in the center, an inlet 44 on the outer periphery of the upper impeller 43, and a lower impeller 45 which rotates connected to the drive shaft 42 below the inlet 44. In addition, a lower discharge port 46 which opens below the lower impeller 45 is provided, and the introduced powder and granular material is uniformly stirred and mixed by the rotation of the upper impeller 43 and the lower impeller 45, so that a set amount can be discharged.

[0017] On the other hand, as a prerequisite for uniformly mixing powder and granular materials and discharging a fixed amount by the table feeder 4, it is preferable that the stored powder and granular materials are uniformly dispersed in the powder and granular material storage section 2 before being introduced into the table feeder 4. However, the powder and granular materials charged into the powder and granular material storage section 2 may be introduced and stored in an unevenly dispersed state due to the specific gravity, particle size, shape, vibration, etc. of the components. In addition, fine particles of the powder and granular materials may adhere to the inner wall surface of the powder and granular material storage section 2, forming a bridge near the discharge section 3 and causing clogging, which may hinder smooth introduction into the table feeder 4.

[0018] In order to solve the above problem, the present invention has an air supply mechanism 5 on the top of the table feeder 4 for supplying high-pressure air toward the inside of the powder / granular material storage section 2. The air supply mechanism 5 is composed of a high-pressure air supply source 51, an air tank 52, an air nozzle 54, and piping 53 connecting these components, with the air tank 52 connected to the high-pressure air supply source 51, and the air tank 52 and the air nozzle 54 connected by piping 53. A general air compressor can be used as the high-pressure air supply source 51, and the air nozzle 54 is disposed at a predetermined position in the powder / granular material storage section 2 so that it can spray air toward the inside.

[0019] The number and locations of the air nozzles 54 can be set appropriately depending on the capacity of the powder / granular material storage section 2, the type and characteristics of the powder / granular material to be added, etc., and are not particularly limited, but typically, multiple air nozzles 54 are provided facing inward in the inverted cone section 22 below the powder / granular material storage section 2.

[0020] 2, a total of 12 air nozzles are provided, eight in the upper stage near the top of the inverted cone section 22 and four in the lower stage near the bottom. By arranging the air nozzles 54 in this manner, it is possible to uniformly supply high-pressure air from the outside to the inside of the powder or granular material in the powder or granular material storage section 2. In addition, by adjusting the air injection direction of the air nozzles 54, it is possible to promote stirring of the powder or granular material, and it is also possible to disperse and mix the powder or granular material more uniformly.

[0021] The mechanism of agitation of powder and granular material by air in the powder and granular material storage and supply tank 1 of the present invention will be described in detail below. First, powder and granular material are charged into the powder and granular material storage section 2, and while the powder and granular material are stored, the air compressor 51 is operated to fill the air tank 52 with air. Then, when agitating the powder and granular material, compressed air in the air tank 52 is sprayed from the air nozzle 54 through the piping 53 at a predetermined pressure and flow rate. Here, the multiple air nozzles 54 are piped so that compressed air of approximately uniform pressure and flow rate is sprayed into the powder and granular material storage section 2.

[0022] The compressed air ejected from the air nozzle 54 passes through the powder and granules in the powder and granule storage section 2, rises, and is discharged from the top of the powder and granule storage and supply tank 1 to the outside. Here, convection occurs when the compressed air passes through the gaps between the powder and granules, causing agitation. In addition, the fine powder adhering to the inner wall surface of the powder and granule storage section 2 is uniformly agitated and dispersed by the agitation and movement of the powder and granules, and bridges occurring near the discharge section 3 are eliminated. As a result, even a mixed powder and granule consisting of multiple types of powders with different particle sizes, shapes, and specific gravities is adjusted to a uniformly dispersed state in the powder and granule storage section 2. Then, the powder and granules in a uniformly dispersed state can be discharged in a fixed amount from the table feeder 4 provided in the discharge section 3 of the powder and granule storage and supply tank 1.

[0023] The timing of supplying air into the powder / granular material storage section 2 and driving the table feeder 4 can be appropriately determined according to the uniform state of the powder / granular material in the powder / granular material storage section 2 and is not particularly limited, but it is usually preferable to supply air into the powder / granular material storage section 2 before driving the table feeder 4. Furthermore, agitation by supplying air into the powder / granular material storage section 2 and driving the table feeder 4 can be performed simultaneously.

[0024] The above describes the powder and granular material storage and supply tank of the present invention based on an embodiment, but the present invention is not limited to the above embodiment, and various modifications are possible within the scope of the gist of the invention.

[0025] For example, in the powdered or granular material storage and supply tank 1 of the above embodiment, the shape of the powdered or granular material storage section 2 is formed with a cylindrical section 21 having a cylindrical upper portion and an inverted conical section 22 having a mortar-like shape whose diameter decreases downward from the middle portion, but this is not limited to this, and the powdered or granular material storage section may be, for example, entirely cylindrical, inverted conical, or spherical.

[0026] According to the powder / granular material storage / supply tank of the present invention, the powder / granular material in the storage / supply tank can be made uniform and can be smoothly introduced into and discharged from the table feeder. [Explanation of symbols]

[0027] 1 Powder storage and supply tank 2 Powder storage section 21 Cylindrical part 22 Inverted cone section 3 Discharge section 4 Table Feeder 41 Motor 42 Drive shaft 43 Upper impeller 44 Inlet 45 Lower impeller 46 Lower outlet 5 Air supply mechanism 51 High pressure air supply source (air compressor) 52 Air Tank 53 Piping 54 Air nozzle

Claims

1. A powder / granular material storage / supply tank having a powder / granular material storage section for storing powder / granular material and a discharge section at a lower portion for discharging the powder / granular material, The discharge section is provided with a table feeder, and an air supply mechanism is provided for supplying high-pressure air to the inside of the powder / granular material storage section, The air supply mechanism has a high-pressure air supply source and an air nozzle facing toward the inside of the powder / granular material storage section.

2. The high-pressure air supply source is an air compressor, and a plurality of the air nozzles are provided.

2. The powder / granular material storage and supply tank according to claim 1.

3. The air supply mechanism and the table feeder can be operated simultaneously.

2. The powder / granular material storage and supply tank according to claim 1.

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