JPH02127319A - Transportation device by high density air - Google Patents

Abstract

PURPOSE:To make the transportation stable for powder with poor fluidity which is easy to generate a rat hole by stirring the powder in a pressure tank by a stirring means and also supplying pressure air so as to fluidity and more pressurize it and supplying it from a send out port to a powder transportation pipe and transporting it by the pressurized air. CONSTITUTION:The inside of a pressure tank 12 filled up with powder is sealed tightly except a powder send out port 24 and a rotary joint 40 is connected to a pressure air supply source. Then, a motor 2 is driven and also the pressure air is supplied. Thus, a stirring blade 16 is rotated and also the pressure air is jetted from the small holes of the stirring blade 16 so as to stir and fluidify the powder and also the inside of the tank 12 is pressurized. Thus, the powder stirred and fluidified sufficiently is sent out to a transportation pipe 14 so as to be transported by the pressure air. In this constitution, the powder with poor fluidity can be transported stably by an air with high density.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a high-concentration pneumatic transport device that can stably transport high-concentration pneumatically even powder with poor fluidity that is prone to rat holes.

<Conventional technology> Conventionally, high concentration pneumatic transportation devices include blow tank type pneumatic transportation devices, fluidized blow tank type pneumatic transportation devices for large capacity and long distance pneumatic transportation, and Beulah type pneumatic transportation using low speed high concentration plug transportation. There are various types of equipment, including Vera 19-type pneumatic transport equipment, Sturtevant-type pneumatic transport equipment, and Baudal bomb-type pneumatic transport equipment, all of which use pressure tanks to fluidize the powder being transported using various methods. Alternatively, it forms and maintains a fluidized plug to enable high-concentration transport.

As shown in FIG. 4, the conventional high-concentration pneumatic transportation device using a pressure tank as described above basically has a powder filling port 22 that can be opened and closed at the top, and a powder filling port 22 at the bottom for delivering the powder. The pressure tank 12 includes a delivery port 24 and a supply port 5z for supplying pressurized air to pressurize the inside, and a powder transport pipe 14 connected to the delivery port 24. In such a high concentration transport device 50, after filling the powder 54 into the pressure tank 12, the filling port 22 is closed and sealed with a closing means 30 such as pulp, and pressurized air is supplied from the supply port 52. The powder 54 is fluidized and blown out from the outlet 24 into the powder transport pipe 14 by pressurizing it to a predetermined pressure, and air and the powder 54 are mixed to form the powder 54 in a fluidized state or as a powder. The powder was transported through the powder transport pipe 14 by blowing air into the transport pipe to form a plug.

<Problems to be Solved by the Invention> By the way, in a high concentration transport device 50 using a pressure tank 12 as shown in FIG.
If the mixing state of the powder with air or the fluidization state of the powder 54 is insufficient, a path for air release called a rat hole 56 will be formed in the pressure tank 12, and the pressurized air supplied to the pressure tank 12 will be was blown through, and the transport efficiency of the powder 54 was significantly reduced. In particular, powders with poor fluidity or powders that tend to adhere to the tank walls of pressure tanks or to each other are more likely to cause the aforementioned rat holes.
When this rat hole occurs, the powder and air are not mixed sufficiently, and the air does not fluidize the powder, so the powder is not sent from the pressure tank to the powder transport pipe.
A large amount of only gas flows out, and the powder transport efficiency, for example, the mixing ratio (ratio of the powder transport weight to the consumed air weight) becomes extremely small.

For this purpose, the pressure of the pressurized air supplied into the pressure tank may be increased, or a rotating shaft 62 may be installed inside the pressure tank 12 and a Fluidization of the powder is promoted by providing a stirring means such as a stirring blade 64 or by jetting gas, for example, air, from the bottom of the pressure tank through a perforated plate.

However, although the method of increasing the pressure of the supplied pressurized air improves the fluidization state of the powder to some extent, it does not essentially prevent the formation of the aforementioned rat holes; Since the supplied air blows through, the rat holes are difficult to disappear, and the fluidization of the powder in the pressure tank is hindered. Furthermore, when powder is transported at high speed under high pressure, there is also the problem that powder transport pipes are likely to wear out, especially for large powders such as soybean, corn, and wheat, which have a high floating speed.

Furthermore, in the high-concentration transport device 60 using stirring blades 64 shown in FIG. 5, it is possible to suppress the formation of rat holes, but the fluidization of the powder due to stirring and the flow of pressurized air into the pressure tank 12 can be suppressed. Since the powder is not fluidized at the same time by being supplied, it is not possible to sufficiently increase the transport efficiency and mixing ratio of the powder if the powder has poor fluidity.

Furthermore, the method of blowing out gas from the bottom of the pressurized tank is
Although some results can be achieved, there is a problem in that the mixing ratio becomes small, although it is necessary to eject a large amount of gas for powders with poor fluidity.

In addition, in the Buehler type pneumatic conveyance device, Beschle type pneumatic conveyance device, Sturtevant type pneumatic conveyance device, etc. that use the aforementioned plug flow, pressurized air is blown into the powder in the powder transport pipe to form a plug. Although this method aims to fluidize the powder and enable high-concentration transportation, it does not directly fluidize the inside of the pressure tank.

In addition, a fluidized blow tank type pneumatic transportation device is equipped with a fluid plate at the bottom of the tank, and a Baudal bomb type pneumatic transportation device is equipped with a diaphragm plate that is vibrated by a vibrator at the bottom of the tank. These flow plates and diaphragm plates are used to create a fluid and agitated state of the powder in the powder transport pipe and to create a stable plug flow. However, sufficient consideration has not been given to the flow of powder with poor fluidity and high adhesiveness in a pressure tank, and it has not been possible to increase the mixing ratio of powder to a sufficiently high level.

The purpose of the present invention is to solve the above-mentioned problems of the prior art, to simultaneously stir and fluidize the powder in the pressure tank, sufficiently mix it with transportation air, and sufficiently fluidize it, thereby improving the fluidity. High mixing ratio, even with poor, highly adhesive powders
An object of the present invention is to provide a high-concentration pneumatic transportation device that can transport high concentrations at low speeds and with high transportation efficiency.

Means for Solving the Problems> In order to achieve the above object, the present invention provides a pressure tank having a closable filling port for filling powder and a delivery port for delivering the powder; It has a powder transport pipe connected to the outlet of the pressure tank, a stirring blade, a rotating shaft to which the stirring blade is attached, and a driving means for driving the rotating shaft, and stirs the powder in the pressure tank. and a stirring means for fluidizing and pressurizing the powder in the pressure tank,
A pressurized air supply means for delivering the powder from the outlet to the powder transport pipe and transporting the powder within the powder transport pipe, and the stirring means is provided with the pressurized air supply means. A high concentration pneumatic transportation device is provided.

In the high concentration air transport device of the present invention, it is preferable that the pressurized air supply means is a plurality of pressurized air jetting small holes provided in the stirring blade.

Further, in the high concentration air transport device of the present invention, it is preferable that the stirring blade intermittently blocks the delivery port.

<Operation of the Invention> As in the configuration of the present invention, the powder in the pressure tank is stirred by the stirring means provided in the pressure tank, that is, the stirring blade, and the pressurized air integrated with the stirring means is By blowing out pressurized air from small holes formed in the supply means, for example, the stirring blade, the powder in the pressure tank can be stirred and fluidized or mixed with air at the same time. Therefore, even if the powder has poor fluidity, is highly adhesive, or has a fine particle size, it is possible to create an optimal agitation and fluidization state for high-concentration transport in the powder transport pipe, resulting in high transport efficiency and high It is possible to achieve high concentration pneumatic transportation at a mixing ratio.

Further, in the present invention, when the stirring blade intermittently blocks the outlet in the pressure tank, a fluidized powder plug is sufficiently formed in the powder transport pipe. Therefore, low-speed, high-concentration transport with a high mixing ratio by means of a plug flow of powder can be easily realized.

<Embodiments> The present invention will be described in detail below based on preferred embodiments shown in the accompanying drawings.

FIG. 1 is a schematic cross-sectional view of a high-concentration pneumatic transportation device according to the present invention.

As shown in the figure, the high concentration pneumatic transportation device 10 of the present invention includes a pressurized tank 12, a powder transport pipe 14 connected to the pressurized tank 12, and an agitation blade 16 provided in the pressurized tank 12. and a rotor 18 to which stirring blades 16 are attached,
It has a motor 20 that is a drive source that rotates the rotor 18 outside the pressurized tank 12. Here, the stirring blade 16, rotor 18, and motor 20 constitute a stirring means.

The pressurized tank 12 has a circular cross section with a reduced diameter at the bottom, a powder filling port 22 at the top, a powder delivery port 24 at the lower side, and a powder transport pipe at the delivery port 24. 14 are connected. The pressurized tank 12 is installed on a mount 28 on a base 26. The filling port 22 is provided with a closing means 30 such as a closing valve or a closing lid so that the pressurized tank 12 can be closed after filling the required amount of powder into the pressurized tank 12 .

The powder transport pipe 14 has a required diameter and length depending on the powder to be transported, the amount of transport, the transport pressure, etc., and is equipped with various means such as valves and other means to improve the transport capacity along the way. , an air blowing device for plug formation, etc. may be provided.

The stirring blade 16 constituting the stirring means is a characteristic feature of the present invention, and its base is attached to the rotor 18, and a large number of stirring blades 16 for jetting pressurized air are attached to the inner wall of the lower part of the pressure tank 12. It has a small hole 32. In the example shown in FIGS. 1 and 2, the stirring blades 16 are spaced at 180° intervals by the rotor! It consists of two wooden hollow round bars attached to 8.

Here, the outer and inner shapes of the cross section of the hollow bar or hollow plate constituting the stirring blade 16 are not particularly limited, and may include various shapes such as circular, elliptical, rectangular, and irregular shapes. The outer shape and inner shape (shape of the hole) of the hollow member may be similar (similar) or different.

The hollow member constituting the stirring blade 16 is preferably attached to the rotor 18 so as to block the powder outlet 24 of the pressure tank 12 connected to the powder transport pipe 14. By doing this, the stirring blade 6 intermittently and periodically blocks the powder delivery port 24 and cuts the powder delivered to the powder transport pipe 14 from the powder delivery port 24 at predetermined time intervals. Therefore, the powder flow becomes intermittent and intermittent, and as a result, powder plugs are periodically formed.

When using the stirring blades 16 as described above, there is no particular restriction on the number of stirring blades 16 attached to the rotor 18;
The window may be adjusted as appropriate depending on the shape and rotation speed of 6, the type and property of the target powder, the amount of transportation, etc., and it may be installed in multiple stages.

Further, the rotation speed of the stirring blade 16 is not particularly limited;
The window may be adjusted as appropriate depending on the type, properties, amount of transportation, etc. of the target powder, but if it has the effect of forming a powder plug like the above-mentioned stirring blade 16, make a short powder plug. When making a long powder plug, rotate it quickly, and when making a long powder plug, rotate it slowly.

The small holes 32 formed in the stirring blade 16 are for blowing out pressurized air to fluidize the powder being stirred in the pressure tank 12, and the hole diameter, installation position, and number of holes are is not particularly limited, and may be adjusted as appropriate depending on the type, property, amount, filling pressure, etc. of the powder to be transported.
For example, in the case of powder with poor fluidity, the hole diameter is about several millimeters, and the installation position is toward the inner wall of the pressure tank 12.
It is preferable to provide them at a predetermined pitch. The reason why the small holes 32 are provided on the inner wall side of the pressure tank 12 is that even if the powder has poor fluidity, it is suspended from the inner wall and prevented from adhering to the inner wall, and at the same time, it prevents the powder from interfering with air. This is to ensure sufficient and uniform mixing to achieve a fluidized state optimal for transportation.

As shown in the rotor 1aLti1, a conical shape is preferable, but the shape is not particularly limited. The reason why the rotor 18 is shaped like a cone is to prevent powder from remaining in the pressure tank 12.

The rotor 18 is fixed to a rotating shaft 34. The rotating shaft 34 is supported by the mount 28 via bearings 36, 36. Any kind of bearing may be used as the bearing 36. Also, between the rotating shaft 34 and the mount 38. A sealing member 37 such as a ring or gland packing is provided to seal the pressurized air in the pressure tank 12 so that it does not leak. A pulley 38 is attached to a portion of the rotating shaft 34 that protrudes from the base 26 on the other side of the rotor 18. The rotating shaft 34 is a hollow shaft, and a pulley 38
A rotary joint 40 is attached to the side tip for supplying pressurized air to the hollow part of this shaft.
The rotary joint 40 is connected to a pressurized air supply source (not shown) through a pipe or hose, and is connected to the rotating shaft 3.
4 is sealed and is for supplying pressurized air to the rotating hollow rotary shaft 34. Therefore, it is not necessary to use a rotary joint as long as a rotary joint that can supply pressurized air without leakage to the rotating shaft is used.

Here, the large number of small holes 32 provided in the stirring blade 16 are for supplying pressurized air into the pressure tank 12, and the small holes 32 provided in the stirring blade 16, the rotor 18, and the hollow rotating shaft 34 are used to supply pressurized air into the pressure tank 12. It is communicated with the air supply port of the rotary joint 40 through a flow path, and constitutes pressurized air supply means. When the rotary joint 40 is connected to a pressurized air supply source (not shown) via a pipe or hose, pressurized air is ejected from the small holes 32.

The motor 20 is installed on a base 26, and a pulley 42 is attached to its rotating shaft that protrudes below the base 26. A belt 44 is stretched between the pulley 38 and the pulley 42, transmits the rotation of the motor 20 to the hollow rotation @34, and the stirring blade 16 attached to the rotor 18 is rotated. Here, although the rotational force from the motor 20 to the hollow rotating shaft 34 is transmitted by a belt transmission consisting of a pulley 38, 42 and a belt 44, other known transmission methods such as a chain transmission, a chain transmission, a gear transmission, etc. You may use any means.

In the example shown in FIG. 1, the rotating shaft 3 that rotates the stirring blade 16 is
4 is extended to the lower side of the pressure tank 12, and the rotating means including the motor 20, the rotary joint 40 for taking in pressurized air, etc. are arranged under the pressure tank 12, but the present invention is not limited to this, and even if the components such as the rotating means and the rotary joint 40 are arranged above the pressure tank 12, as in the high concentration air transport device 11 shown in FIG. good.

Powders that can be transported by the high-concentration pneumatic transportation device of the present invention include relatively large grains such as common salt, chemical seasonings, iron powder, sand, granular plastics, and granular grains such as wheat, corn, soybeans, and rice. Examples include grain powders such as grain powder, small-grain flour, starch, chemical powders, cement, ceramic powders, tancal (calcium carbonate powder), baking soda (sodium bicarbonate powder), diatomaceous earth, and inorganic powders such as alumina. However, the high-concentration pneumatic transportation device of the present invention is particularly suitable for powders with poor fluidity, such as diatomaceous earth, fine alumina powder, and bread crumbs, and powders with high adhesiveness, such as tancal, titanium oxide, and particles with a small particle size. Effective for powders of 10 μm or less.

In the high-concentration pneumatic transportation device 10 of the present invention shown in FIG. 1, first, the closing means 30 of the filling port 22 is opened, the powder to be transported is filled from the filling port 22, and after filling the required amount, the closing means 30 is opened. The inside of the pressure tank 12 is sealed except for the powder delivery port 24 connected to the powder transport pipe 14.

At this time, the rotary joint 4o is connected to a pressurized air supply source (not shown) by a pipe or the like.

Next, the motor 20 is driven and supply of pressurized air from a pressurized air supply source (not shown) is started. When the motor 20 rotates, the rotational force is transmitted from the pulley 42 attached to the rotating shaft of the motor 20 to the pulley 38 via the belt 44, and the rotating shaft 34 to which the pulley 38 is attached rotates at a predetermined rotation speed. In this way, the rotating shaft 3
4 and the rotor 18 rotate, the stirring blade 16 attached to the rotor 18 also rotates, and the powder in the pressure tank 12 is stirred. At this time, pressurized air supplied from a pressurized air supply source (not shown) is sent to the hollow portion of the rotating hollow rotating shaft 34 through the rotary joint 4o.

The air passes through an air passage in the rotor 18 and is ejected from a large number of small holes provided in the stirring blade 16 toward the inner wall of the pressure tank 12 .

In this way, the powder in the pressure tank 12 is stirred and mixed with pressurized air at the same time, so even if the powder has poor fluidity, highly adhesive powder, or powder with extremely small particle size, However, when the powder is sufficiently mixed with air and becomes fluidized, sufficient transport capacity is provided, and the powder is delivered to the powder transport pipe 14 from the powder delivery port 24 at the bottom of the pressure tank 12. .

Here, since the stirring blade 16 periodically blocks the powder delivery port 24, the powder in a fluidized state is delivered intermittently from the delivery port 24 to the powder transport pipe 14, so that the powder is delivered at low speed and at high concentration. A powder plug is formed that is suitable for transportation, and this powder plug is
Even if the powder is transported over a long distance, it is preferably transported at a low speed within the powder transport pipe 14. Since the powder is transported at a low speed, not only can crushing of the powder be prevented, but also the life of the powder transport pipe 14 can be maintained for a long time, and the overall transportation cost including the equipment can be reduced.

Therefore, in the high-concentration air transport device 1o of the present invention, the fluidity of the powder in the pressure tank 12 is sufficient and uniform, and there is no path for air to escape through rat holes or the like. Powder can be transported with high transport efficiency and high mixing ratio.

Although the high concentration pneumatic transportation device according to the present invention is basically configured as described above, the present invention is not limited to this, and various improvements and designs may be made without departing from the gist of the present invention. Of course, it is possible to change.

<Example> (Example of the present invention) Using a high concentration pneumatic transportation device 1° having the configuration shown in FIG.
Pneumatic transportation of the powders shown in Table 1 was carried out under the following conditions.

The results are shown in Table 1.

*Powder transport distance: 40m Inner diameter of powder transport pipe: 47.8mm Inner diameter of upper part of water pressure tank: 600mm Height of pressure tank 2900mm Inclination of lower part of pressure tank = 70° Pressure crab in pressure tank 1. Okg/cm2 * Number of stirring blades installed = 2 Stirring blade shape: Diameter 25 mm x Length 360 m Stirring blade installation angle near 0° Rotation speed of stirring blade: 20 rpm * Installation pitch of small holes for pressurized air blowout: 10 mm Diameter of small hole for pressurized air injection: 2 mm Pressurized air injection pressure 1.2 kg/cm' (Comparative Example 1) Using the high concentration air transport device 50 having the configuration shown in FIG.
The powders shown in Table 1 were transported by air. Here, the powder transport distance, the inner diameter of the powder transport pipe, the shape of the pressure tank (upper inner diameter, height, lower slope), and pressurizing conditions inside the pressure tank were the same as in the example of the present invention.

The results are shown in Table 1.

(Comparative Example 2) Using a high concentration pneumatic transport device 6° having the configuration shown in Fig. 5,
The powders shown in Table 1 were transported by air. Here, the powder transport distance, the inner diameter of the powder transport pipe, the shape of the pressure tank, and the pressurizing conditions inside the pressure tank were the same as in the example of the present invention. A stirring blade with the following conditions was used.

*Number of stirring blades installed: 2 Shape of stirring blades: height (h) 900mm, width (W) 5
50mm.

Lower inclination angle 70” Thickness: 25mm Stirring blade rotation speed: 20 rpm Table 1 shows the results.

Surface transportation weight As shown in Table 1, when transporting diatomaceous earth that is prone to rat holes, the high concentration pneumatic transportation device of the present invention
Compared to Comparative Example 1, the transport amount was twice as large and the mixing ratio was twice as large. In addition, the present invention example was found to be able to improve both the transport amount and the mixing ratio by about 1.6 times compared to Comparative Example 2.

Furthermore, as shown in Table 1, the average particle size (DS.) is 2.5.
When transporting tancal (calcium carbonate powder) with a raw adhesion of μm, the present invention example has a transportation amount and a mixing ratio of 1.2 to 1.6 times as compared to Comparative Examples 1 and 2. I was able to improve it.

<Effects of the Invention> As described in detail above, according to the present invention, stirring of the powder in the pressure tank and mixing with air are performed simultaneously with fluidization, and the powder that is stirred and floated is Since air is injected into the pressure tank, the powder in the pressure tank is sufficiently fluidized, has a high transport capacity, and is sent into the powder transport pipe.
It can be conveniently transported even over long distances.

Therefore, according to the present invention, even if the powder has poor fluidity, high adhesiveness, or small particle size, there will be no air vents such as rat holes in the pressure tank. , can be transported at all times with high transport efficiency, high transport volume, and high mixing ratio.

In addition, in the present invention, if the stirring means is configured to intermittently and periodically shut off the powder delivery port connected to the powder transport pipe, a powder plug in a highly fluidized state can be formed, so that the powder can be delivered at low speed and high speed. Concentration transport can be achieved. Therefore, it is not only possible to prevent the powder from being crushed, but also to extend the life of the powder transport pipe, thereby reducing the overall transportation cost including the equipment.

[Brief explanation of drawings]

FIG. 1 is a schematic cross-sectional view of an embodiment of a high concentration pneumatic transportation device according to the present invention. Figure 2 shows n - n of the high concentration pneumatic transportation device shown in Figure 1.
FIG. FIG. 3 is a schematic cross-sectional view of another embodiment of the high concentration pneumatic transportation device according to the present invention. FIGS. 4 and 5 are examples of conventional pneumatic transportation devices. Explanation of symbols 10.11...High concentration pneumatic transportation device of the present invention, 12.
...Pressure tank, 14...Powder transport pipe, 16.64...Stirring blade, 18...Rotor, 20...Motor, 22...Filling port, 24...Delivery port, 26 ...Base, 28...Mount, 30...Closing means, 32...Small hole, 34.62...Rotating shaft, 36...Bearing, 37...Sealing member, 38. 42... Pulley, 40... Rotary joint, 44... Belt, 50.60... Conventional pneumatic transport device, 2... Supply port, 4... Powder, 6... radhole

Claims (3)

[Claims] (1) a pressure tank having a closable filling port for filling powder and a delivery port for delivering the powder;
It has a powder transport pipe connected to the outlet of the pressure tank, a stirring blade, a rotating shaft to which the stirring blade is attached, and a driving means for driving the rotating shaft, and stirs the powder in the pressure tank. a stirring means for fluidizing the powder in the pressure tank, pressurizing the powder, sending it from the outlet to the powder transport pipe, and transporting the powder inside the powder transport pipe; A high-concentration air transport device, characterized in that the stirring means is provided with the pressurized air supply means. (2) The high concentration air transport device according to claim 1, wherein the pressurized air supply means is a plurality of pressurized air jetting small holes provided in the stirring blade. (3) The high concentration air transport device according to claim 1 or 2, wherein the stirring blade intermittently blocks the outlet.