JPH0330854A - Powder supply apparatus - Google Patents

Abstract

PURPOSE:To form whirling-up and vertical gas streams so as to fluidize powder sufficiently by installing a cylindrical part onto a taper part communication therewith, which communicates with a spherical part installed in a vessel, and by installing a downward blow pipe for the purpose of jetting compressed gas in the opposite direction to the opening of spherical part and fluidizing the powder. CONSTITUTION:A spherical part 3, a taper part 4 and a cylindrical part 5 are formed inside a vessel 2 in this order from the bottom, and this taper part 4 communicates with the upper spherical part 3 and forms a frustum of cone opening upward. A compressed gas is jetted out of a downward jetting pipe 9 in the opposite direction to the opening of spherical part 3, powder charged in the vessel 2 is made to fluidize and a fixed quantity of the powder is taken out of discharge ports 14 and 15.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a powder supply device, particularly to a powder supply device used in a thermal sprayer or the like.

[Prior Art] In a powder supply device 51 used in a conventional thermal sprayer, etc., as shown in FIG. and are formed in this order from below. The gas chamber 53 includes a valve 5.
Pressure gas at high pressure (for example, 8 atmospheres) is inserted through 7. Inside the container body 52, a cylindrical insertion tube 58 is provided.
is provided. A powder blowing hole 59 is formed at the lower end of the insertion tube 58, and a high pressure (
For example, a pressure gas of 8 atmospheres) is inserted. Plug tube 5
A repelling plate 61 is provided above 8. The height of the bouncer 1i61 is adjusted using a height adjustment handle 62.

Pressure gas is sent to gas chamber 53 through valve 57. The porous plate 54 within the cylindrical portion 55 is filled with powder. This porous plate 54 has countless holes. Pressure gas therefore rises through these holes and enters the cylindrical part 55. These fluidize the powder.

This fluidized powder is transferred to the powder blowing hole 59 of the insertion tube 58.
It is sucked in from. This powder is sucked by valve 60.
This is done by ejecting pressurized gas through the In this way, the powder flows through the bayonet tube 58 and
It is ejected from the top of the insertion tube 58. At this time, the jet of powder hits the repelling plate 61 and scatters around. Of the powder scattered in the conical part 56, only a suitable amount is carried by the air flow and taken out from the upper part of the conical part 56. The amount of powder taken out is adjusted by adjusting the valve 60 and the height of the splash plate 61.

In another conventional powder supply device 71, as shown in FIG. 4, a container body 72 includes a conical portion 73, a cylindrical portion 74,
The conical portion 75 is formed in this order from below. An insertion tube 76 is provided inside the container body 72. A powder blowing hole 77 is formed at the lower end of the insertion tube 76, and high pressure gas (for example, 8 atmospheres) is inserted through a valve 78. A splash plate 79 is provided above the insertion tube 76.

The conical portion 73 is provided with a vibrator 81 that vibrates with pressure gas via a valve 80.

In this powder supply device 71, in order to smoothly flow the powder inserted into the conical part 73 or the conical part 73 and the cylindrical part 74, a vibrator 81 is used to cause the powder to flow, and the powder is blown into the powder inlet at the lower part of the insertion tube 76. Powder can easily flow in smoothly from the hole 77. In addition, the powder flowing through the insertion tube 76 and rising is removed by the repelling plate 7.
It hits 9 and is scattered in all directions. This splash board 79
Only the appropriate amount of powder scattered in all directions by the conical part 7
It is taken out from 5.

The remaining powder falls into the container body 72. By circulating the powder in the container body 72 in this way, the powder can be
It always contains a large amount of air, becomes bulky, and tends to flow easily.

Furthermore, in another conventional powder supply device 91, as shown in FIG. 5, a container body 92 is formed with a cylindrical portion 93, a conical portion 94, and a cylindrical portion 95 in this order from below. The cylindrical portion 93 is provided with a nozzle 96 for blowing out high-pressure gas (for example, 8 atmospheres) and a powder blowing hole 97 at a position opposite to the nozzle 96. In addition, the cylindrical portion 93 includes
An electromagnetic vibrator 98 is provided to generate vibrations.

In this powder supply device 91, the powder inserted into the container body 92 is sucked into the powder blowing hole 97 by the pressure gas blown out from the nozzle 96, and is taken out. At this time, the powder inserted into the container body 92 flows. If the powder is not flowing properly, a vibrator 98 is used to fluidize the powder.

[Problem to be Solved by the Invention 1] However, since these conventional powder supply devices use high-pressure gas, the powder is pushed by pressure and does not flow, and the powder does not adhere to the wall of the container body. It will stick to. Furthermore, since the shape of the container body is not appropriate, a large amount of powder adheres to the container. In addition, in the powder supply device shown in Fig. 3, the pressure gas blown out from the perforated plate does not cause sufficient flow.
A gas hole is formed. Furthermore, the powder supply apparatuses shown in FIGS. 4 and 5 require a vibrator, and the vibrations from the pie break are transmitted to the powder being taken out. This will result in more or less powder being produced.

Therefore, these powder supply devices eject a large amount of powder or only emit gas, and are unable to emit a constant amount of powder. In addition, the powder adheres to the wall of the container and remains at the bottom of the container, making it difficult to release the entire amount of powder inserted into the four containers, resulting in a large amount of powder being wasted (for example, several tens of percent). Ta.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned technical problems and to provide a powder supply device that can take out a certain amount of powder without using a vibrator and wastes less powder.

[Means for Solving the Problems] The powder supply device according to claim (1) inserts pressurized gas into a container and takes out the powder inserted into the container from the outlet with the powder on the gas, wherein On the inner surface of the A cylindrical part is formed from below in this order, and pressurized gas is blown out in the opposite direction to the opening direction of the spherical part.
A downward blowing pipe is provided to flow the powder.

The powder supply device according to claim (2) is the one according to claim (1), further comprising a blow-off port for blowing out pressurized gas upward in the circumferential direction at the lower part of the cylindrical portion.

The powder feeding device according to claim (3) is characterized in that the powder supply device according to claim (1) or (
In addition to 2), an arm is further provided near the outlet to extend inward of the container and catch the fluidized powder.

The powder supply device according to claim (4) is the powder supply device according to claim (1) or (2).
Or in (3), the pressurized gas is pressurized oxygen.

[Operation] A spherical part, a tapered part, and a cylindrical part are formed in this order from below on the inner surface of the container. The spherical portion is formed into a spherical shape. The tapered portion is formed in a truncated conical shape that communicates above the spherical portion and opens upward. The cylindrical portion communicates above the tapered portion and is formed in a cylindrical shape.

The downward blowing vibrator blows out pressurized gas in a direction opposite to the opening direction of the spherical part to cause the powder to flow.

The blowout port is provided at the bottom of the cylindrical portion and blows out pressurized gas upward in the circumferential direction.

The arm is provided near the outlet, extends inside the container, and catches the fluidized powder.

For example, pressurized oxygen is used as the pressurized gas.

[Example] Hereinafter, the present invention will be explained in detail based on the drawings.

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention.

A spherical part 3, a tapered part 4, and a cylindrical part 5 are formed in this order from below on the inner surface of the container body 2 of the powder supply device 1. The spherical portion 3 is formed into a spherical shape. The tapered part 4 is formed in a truncated conical shape that communicates with the upper part of the spherical part 3 and opens upward.

The cylindrical portion 5 communicates above the tapered portion 4 and is formed in a cylindrical shape. The container body 2 is made of stainless steel material, for example. The spherical part 3, the tapered part 4, and the cylindrical part 5 are formed by dividing the container body 2 into a plurality of parts, for example, three parts, and hollowing them out. A lid 7 is attached to the upper end of the container body 2 via a backing 6.

A joint 8 is provided at the lower end of the cylindrical portion 5 . This joint 8 is provided with a downward blowing vibe 9 that bends and extends to the vicinity of the bottom of the spherical portion 3 . Furthermore, an oxygen cylinder for outputting pressurized oxygen as pressurized gas is connected to the joint 8 via a pipe (not shown). A diaphragm is formed at the tip of the downward blowing vibrator 9. The pressure of oxygen output from the oxygen cylinder is selected, for example, from 1.8 to 3 atm. Therefore, from the downward blowing vibrator 9, pressurized oxygen from the oxygen cylinder is applied to the bottom of the spherical part 3 in a vertical direction.
That is, the air is blown out in a direction opposite to the opening direction of the spherical part 3.

Furthermore, a joint 10 is provided at the lower end of the cylindrical portion 5 . This joint 10 is provided with an air outlet 11 that opens upward in the circumferential direction of the cylindrical portion 5 .

The aforementioned oxygen cylinder is connected to the joint 10 via a pipe (not shown). The elevation angle of the air outlet 11 is 5~
Selected 15 times. Therefore, pressurized oxygen from the oxygen cylinder is blown out from the air outlet 11 upward in the circumferential direction of the cylindrical portion 5 .

There is a joint 1213 at the top and middle of the cylindrical part 5.
are provided respectively. An outlet opening 14.15 is formed in each joint 12.13. Outlet 14゜1
5 are respectively provided with arms 16,17 which communicate with this outlet 14,15 and extend inwardly of the cylindrical part 5. arm 16
, 17 are formed in a semicircular arc shape. Furthermore, thermal spray guns are connected to the joints 12 and 13 through pipes (not shown), respectively. Note that the circumferential positions of the joint 12 and the joint 13 are changed as shown in FIG. Therefore, arm 16 and arm 17 are
are arranged to cross each other.

The powder to be inserted into the container body 2 may range from a weight powder of 60 mesh or less (metal, ceramic, glass, etc.) to an ultra-light powder (polyethylene, nylon, Teflon, epoxy resin, etc.).

The dimensions of the spherical part 3 and the like (the diameter of the spherical part 3 is expressed as 100%) were as follows.

Diameter of spherical part 3: 30 m (100%) Diameter of throat 18, where spherical part 3 and tapered part 4 communicate, 40 mm (43%)
) Distance from the center of the spherical part 3 to the upper end of the tapered part 4 4
Theory 9 (163%) Inner diameter of cylindrical part 5 41mm (137%) Arm 16. 1
Length of 7: 40 mn + (133%) Width of arm 16.17: 10 mm (33%) Outer diameter of lower blowout pipe 9: 7 m
m (23%) Diameter of outlet 11 0.7 mm Length from center of spherical part 3 to upper end of cylindrical part 5 215 m
m (717%) Diameter of the outlet 14 8 mm (26%) In the powder supply device 1 configured in this way, when the thermal spray gun is operated and the outlet 14. The input compressed oxygen passes through the downward blow-off pipe 9 and is blown out vertically to the bottom of the spherical part 3.

One of the streams of this blown oxygen rises along the surface of the spherical part 3, as shown by the broken line, and reaches the throat 18 of the spherical part 3.
The winding flow 19 is bent in the direction opposite to the plane of the winding 19 and extends from the tapered part 4 to the backing 6 at the upper end point of the cylindrical part 5. Note that this winding flow 19 rotates to the left or to the right due to the influence of the earth's rotation.

One of the other oxygen flows rises vertically upwards to the backing 6 at the upper end point, as shown by the dashed line;
Upon hitting the backing 6, a vertical flow 20 descends along the side surface of the cylindrical portion 4.

Further, compressed oxygen manually applied from the joint 10 is blown out along the side surface of the cylindrical portion 5 through the blow-off port 11. The flow of this blown oxygen is as shown by the wavy line.
Spiral i21 rising along the upper circumferential direction of the surface of the cylindrical portion 5 and extending to the backing 6 located at the upper end point of the cylindrical portion 5
becomes.

Therefore, the powder inserted into the container body 2 is flowed along with the swirling flow 19, the vertical flow 20, and the spiral flow 21. The powder that hits the upper end point and falls is again caught up in the winding flow 19, the vertical flow 20, and the spiral a21 and rises. Thereby, the powder is removed in quantity from the outlet 14.15 via the arm 16.17 or directly in the oxygen stream. Moreover, the cylindrical part 5
Powder adhering to the peripheral wall surface of is also drawn into the winding flow 19 and the spiral flow 21 and flows. Here, the reason why a constant amount of powder is taken out is that as the amount of flowing powder decreases, the portion that does not contain powder increases from the lower spherical portion 3, and the powder is not diluted. No powder remains on the bottom of the spherical portion 3, and no powder adheres to or remains on the walls of the spherical portion 3 and the tapered portion 4. The remaining fluidized powder is efficiently caught by the arms 16 and 17.

The spiral flow 21 flows upward in the circumferential direction along the wall surface of the cylindrical portion 5 . Therefore, if there is no spiral flow 21 on the peripheral wall surface of this cylindrical portion 5, 100% of the inserted powder
When the spiral flow 21 was also present, only 2% of the inserted powder remained.

Therefore, in the powder supply device 1, a fixed amount of powder can be taken out without using a vibrator, and waste of powder can be reduced.

Note 1. Even if the dimensions are not as per the above-mentioned embodiment, the spherical part 3
The diameter of the throat 18 where the spherical part 3 and the tapered part 4 communicate is 43%, the distance from the center of the spherical part 3 to the upper end of the tapered part 4 is 163%, and the inner diameter of the cylindrical part 5 is 100%. If it is set to 137%, etc., it can be implemented in the same manner.

Further, as other embodiments of the present invention, the ratios of the respective dimensions may be set to other ratios.

Furthermore, the outlet may be one or more, and may be provided at any position in the cylindrical portion, or may be provided in the lid.

[Effects of the Invention] As described above, according to the present invention, the powder feeding device of claim (1) includes a spherical portion formed in a spherical shape on the inner surface of the container;
A truncated conical tapered part that communicates with the upper part of the spherical part and opens upward, and a cylindrical part that communicates with the upper part of the tapered part and has a cylindrical shape are formed in this order from below, and the spherical part is formed in this order. A downward blowing pipe is provided for blowing out pressurized gas in a direction opposite to the opening direction of the section and causing the powder to flow.

This creates a swirling flow and a vertical flow within the container.

Therefore, the powder is sufficiently fluidized and a certain amount of powder can be taken out. In addition, the swirling flow and vertical flow can eliminate powder remaining at the bottom of the bulb, which is the bottom of the container. Further, the winding flow can eliminate powder adhering to the wall surfaces of the spherical portion and the tapered portion, and reduce the amount of powder adhering to the wall surface of the cylindrical portion.

In the powder supply device of claim (2), an outlet for blowing out pressurized gas upward in the circumferential direction is further provided in the lower part of the cylindrical portion.

This creates a spiral flow.

Therefore, the amount of powder adhering to the wall surface of the cylindrical portion can be further reduced.

In the powder supply device according to claim (3), an arm is further provided in the vicinity of the outlet, extending inward of the container and catching the fluidized powder.

Therefore, the fluidized powder can be caught efficiently.

In the powder supply device according to claim (4), pressurized oxygen is further used as the pressurized gas.

Therefore, thermal spraying can be performed at high temperatures.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the cutting plane line nn in FIG. 1, and FIGS. 3 to 5 are longitudinal cross-sectional views of a conventional powder feeding device. It is a front view. 1...Powder supply device 2...Container body 3...Spherical part 4...Tapered part 5...Cylindrical part 9...Downward blowing vibrator 11...Blowout ports 14, 15... Output ports 16, 17...Arm Figure 2 Figure 3 Figure 7 Figure shows powder

Claims (4)

[Claims] (1) In a powder supply device that inserts pressurized gas into a container and takes out the powder inserted into the container from the outlet with the powder on the gas, the inner surface of the container has a spherical part formed in a spherical shape, a spherical part a tapered part formed in a truncated conical shape that communicates with the upper part of the part and opens upward;
A cylindrical part formed in a cylindrical shape is formed from below in this order, and pressurized gas is blown out in the opposite direction to the opening direction of the spherical part.
A powder supply device characterized in that a downward blowing pipe for flowing the powder is provided. (2) The lower part of the cylindrical portion is provided with an outlet for blowing out pressurized gas upward in the circumferential direction.
1) Powder feeding device. (3) The powder supply device according to claim 1 or 2, wherein an arm is provided near the outlet to extend inward of the container and catch the fluidized powder. (4) The powder supply device according to claim (1), (2) or (3), wherein the pressurized gas is pressurized oxygen.