JP3107852B2 - Powder supply system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a constant-quantity supply apparatus for quantitatively and continuously supplying a granular material such as coal fine particles or iron oxide fine particles.

[0002]

2. Description of the Related Art Conventionally, as a means for quantitatively and continuously supplying powders and granules, a so-called screw feeder using a screw having a spiral groove is generally used. However, screw feeders often cause bridges (crosslinking) due to the aggregation of powder and granules,
There is a problem in that the supply of powder becomes unstable because the powder cannot enter the groove of the screw, and in extreme cases, the fluidization itself becomes difficult due to the aggregation of the powder and the quantitative supply becomes impossible. there were.

On the other hand, as another means for continuously and quantitatively supplying powders and granules, for example, a fluidized bed feeder is conventionally known. FIG. 4 shows an example of such a case.
Is provided with a gas-distributing plate 51 at the bottom of the container, and the granular material C is stored and arranged on the dispersing plate 51. And an air inlet 52h at the lower part of the air supply pipe 52.
Is provided. Then, a gas such as helium gas is supplied from an air supply port 50 a provided at the bottom of the container below the dispersion plate 51 to bring the powder and granules C into a fluidized state.
2a, the gas for powder feeding such as helium gas is accompanied by the powder flowing from the powder inlet 52h, and the powder is quantitatively continuous from the other end 52b of the air pipe 52. Supply. Reference numeral 52f denotes an overflow outlet provided in the air supply pipe 52. However, in the fluidized bed feeder as described above, when the size of the granular material becomes small, fluidization becomes difficult due to agglomeration of the granular material, and there is a risk that supply becomes impossible.

[0004] The feed rate of the granular material depends on the rotation speed of the screw in a screw feeder.
In the case of a fluidized bed feeder, it is controlled by the amount of gas to be extracted from the fluidized bed. However, it is extremely difficult to stably and continuously supply powders at a low speed in any of the conventional methods. Was.

[0005]

DISCLOSURE OF THE INVENTION The present invention has been proposed in view of the above problems, and is capable of stably and quantitatively supplying various kinds of powders from submicron to several millimeters or less at an arbitrary supply rate. It is an object of the present invention to provide an apparatus for quantitatively supplying a granular material that can be continuously supplied.

[0006]

Means for Solving the Problems In order to achieve the above-mentioned object, an apparatus for quantitatively supplying a granular material according to the present invention has the following configuration. That is, it has a powder supply port at the upper end,
An air supply pipe for supplying powder and granular material having a spout opening at the upper end toward the powder and granular material supply port is provided in a vertically cylindrical powder and granular material storage pipe containing powder and granular material to be supplied. It is characterized in that it is provided movably in the up and down direction, and is provided with driving means for moving the air supply pipe downward at a constant speed.

[0007]

In the above construction, when the gas supply pipe is moved down at a constant speed by the driving means while continuously feeding the gas into the gas supply pipe, the gas sent into the gas supply pipe is supplied to the powdery or granular material from the upper outlet. The spout moves downward while spouting toward the supply port, and the powder and granules contained in the storage tube are dislodged from the top by the gas discharged from the spout and are stored along with the gas. It flows out from the upper supply port of the pipe, so that it is possible to continuously supply the powdered material quantitatively.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be specifically described based on an embodiment shown in the drawings. FIG. 1 is a front view showing an embodiment of a powder and granular material quantitative supply apparatus according to the present invention, and FIG. 2 is a vertical side view thereof. In the figure, reference numeral 1 denotes a gantry, on which a pair of left and right vertical rods 2 is mounted and supported by four columns 3 and a support plate 4 provided at the upper end thereof. A powder / particle storage tube 5 having a powder / particle supply port 5a at the upper end is attached to the upper part of the vertical rods 2 via a pair of upper and lower brackets 6, 6. The air supply pipe 7 for supplying the granular material having an ejection port 7a opening toward the above-described granular material supply port 5a at the upper end can move vertically and concentrically with the granular material storage tube 1. It is provided in.

A flexible communication pipe 9 is connected to a lower end of the air supply pipe 7 via a rotary joint 8, and the rotary joint 8 is a movable base 10 that moves up and down along the vertical rods 2. Mounted and supported. Numeral 11 denotes a motor for moving the movable table 10 up and down, as shown in FIG. 2, for rotating a driven gear 14 screwed to a screw rod 13 through a driving gear 12 provided on an output shaft 11a thereof in a forward and reverse direction. As a result, the movable table 10 moves up and down, whereby the upper part of the air supply pipe 7 moves up and down in the powder material storage pipe 5.
Reference numeral 15 denotes a controller for controlling the forward / reverse rotation and rotation speed of the motor 11, and reference numerals 16 and 17 denote bearing members for mounting and supporting the gears 12 and 14 on the movable base 10 so as to freely rotate. The output shaft 11a of the motor 11
On the upper side, a gear 18 for driving air supply pipe rotation is provided integrally with the drive gear 12, and a driven gear 19 meshing therewith is provided.
Is configured to rotate the air supply pipe 7 via the.

A gas supply source such as a gas cylinder (not shown) is connected to the air supply pipe 7 as shown in FIG.
0, the gas is supplied through the flow meter 21 and the communication pipe 9. The amount of gas ejected from the ejection port 7 a at the upper end of the air supply pipe 7 turns the valve 20 while watching the flow meter 21. Can be adjusted arbitrarily.

In the above configuration, the jet port 7 of the air supply pipe 7
In the state where a is positioned in the upper part of the storage tube 5, the powder C is filled in the powder storage tube 5 as shown in FIG.
When the motor 11 is rotated at a predetermined speed while supplying a constant amount of gas such as helium, the air supply pipe 7 is rotated via the gears 18 and 19, and at the same time, the gear 12 and the screw rod 13 are rotated.
The movable base 10 moves downward by the rotation of the gear 14 screwed with the gear, and accordingly, the air supply pipe 7 moves downward in the storage pipe 5 at a constant speed. Then, while the gas sent into the air supply pipe 7 is ejected from the ejection port 7a toward the granular material supply port 5a, the ejection port 7a moves downward, and is accommodated in the storage pipe 5 by the gas emitted from the ejection port 7a. The granular material which has been broken down in order from the top is accompanied by a gas and the granular material supply port 5a
, And the powder can be continuously supplied quantitatively continuously.

In particular, as described above, the gas emitted from the jet port 7a acts to break down the granular material in the storage tube 5 in order from the top, so that the occurrence of a bridge or the like can be reduced as much as possible. . Further, the amount of gas ejected from the ejection port 7a can be arbitrarily adjusted by rotating the valve 20, and the amount of ejected gas is always maintained at least equal to or higher than the descending end speed of the powder and granular material. By appropriately adjusting the descending speed, it is possible to continuously and satisfactorily supply various kinds of powders from submicron to several millimeters or less at a desired supply speed. In addition, storage tube 5
The supply speed can be controlled by changing the diameter of the feed.

Although the air supply pipe 7 does not necessarily need to be rotated, the air supply pipe 5 can be rotated as in the embodiment.
Can be smoothly moved downward while separating the powdery particles attached to the surface. If a vibrator 22 or the like for vibrating the granular material storage tube 5 is provided as necessary as shown by the chain line in FIG. 1, the granular material attached to the storage tube wall can be dropped, and a bridge or the like can be formed. Occurrence is further reduced, and fluctuation of the supply amount of the granular material can be prevented.

If the storage tube 5 is made of a transparent material such as acrylic resin or glass, the supply state of the granular material can be monitored. The storage pipe 5 is made of a material having good pressure resistance, and the storage pipe 5 is provided with a supply / exhaust port 5b for pressure adjustment as necessary as shown in FIG. If the pressure inside the storage tube 5 is adjusted by supplying and exhausting the gas into and from the inside, supply under a wide range of pressures from a reduced pressure to a pressurized pressure according to the pressure on the powder supply side is also possible.

[Experimental Example] The gas flow rate at the jet port 7a of the air supply pipe 7 was set to 5 cm / sec using the above-mentioned powdery and particulate material supply apparatus and using nitrogen gas as a gas for powdery and particulate feed. , And the supply of coal fine particles of 67 microns or less, the supply amount of the particles was able to be continuously and extremely stably supplied with little change (pulsation). Similarly, nitrogen gas was used as a gas for powder supply, and iron oxide fine particles of 5 microns or less were supplied by setting the gas flow rate at the jet port 7a of the air supply pipe 7 to be 10 cm / sec. However, the supply amount of particles could be continuously and extremely stably supplied with little change.

[0016]

As described above, according to the present invention, the following effects can be obtained. 1) It is possible to stably supply a variety of powders from submicron to several millimeters or less without pulsation. 2) The supply speed of the granular material can be arbitrarily set, and the supply speed range is wide, and extremely low supply of about 1 gram per hour is possible. 3) Since it is a closed system, it can be used in any gas atmosphere. 4) By using a pressure-resistant storage tube, supply under a wide range of pressures from reduced pressure to increased pressure is also possible.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of an apparatus for quantitatively supplying powders and granules according to the present invention.

FIG. 2 is a vertical sectional side view of the apparatus for quantitatively supplying the granular material.

FIG. 3 is an enlarged vertical sectional front view of a main part thereof.

FIG. 4 is a vertical cross-sectional view of a fluidized bed feeder showing an example of a conventional quantitative feeder.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stand 2 Vertical rod 5 Granular material storage tube 5a Granular material supply port 7 Air supply tube 7a Spout port 10 Movable table 11 Motor 12, 14 Gear 13 Screw rod

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Toshiyuki Ozaki 2-17-8 Axgaya, Konan-ku, Yokohama-shi, Kanagawa Prefecture (56) References JP-A-2-111431 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) B01J 4/00-4/02 B65G 53/16

Claims (3)

(57) [Claims] 1. A powdery material supply port at an upper end, in a vertically cylindrical powdery material storage pipe in which a powdery material to be supplied is accommodated, is provided at an upper end toward said powdery material supply port. An air supply pipe for feeding a granular material having an opening which is opened is provided so as to be movable in a vertical direction, and a driving means for moving the air supply pipe down at a constant speed is provided. Feeding device. 2. The apparatus according to claim 1, wherein the downward moving speed of the air supply pipe is arbitrarily adjustable. 3. The apparatus according to claim 1, further comprising a supply / exhaust port for adjusting pressure in the storage tube, wherein the powder storage container is provided with a supply / exhaust port.