JP4132394B2 - Powder and particle feeder - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a granular material supply device for storing and sequentially supplying granular materials such as baking soda to a target part. More specifically, the present invention relates to a heating means for drying powder particles in a storage tank, and relates to an improved technique for improving the heating efficiency.
[0002]
[Prior art]
In the powder supply device, in order to heat and dry the powder in the storage tank, a heating tank is attached to the wall of the storage tank, or dry air is introduced from below the storage tank. It is known (see Japanese Utility Model Laid-Open No. 4-70466, Japanese Utility Model Laid-Open No. 61-202459). However, in the case of the prior art in which the heating means is attached to the wall of the former storage tank, the granular material in the vicinity of the wall to which the heating means is attached is satisfactorily heated. There was a problem that a proper heating action could not be obtained. In addition, heat radiation to the outside of the heating means is wasted and it cannot be said that the thermal efficiency is good. On the other hand, in the case of the prior art in which dry air is introduced from below the latter storage tank, it is easy to obtain a heating action from the inside to the powder particles in the tank, but conversely by heat radiation from the tank wall to the outside. There existed a problem that the temperature of the granular material near a wall part fell easily. If the amount of dry air introduced is increased, it is possible to compensate for heat dissipation from the wall, but if it is increased too much, it will rise in the case of light particles, and the supply state of the particles will be stable. There was a difficulty of affecting the sex. Therefore, the prior art having both heating means is disclosed, but not only a separate heating means is required, but also waste due to heat radiation to the outside of the heating means attached to the wall of the storage tank. Is still not resolved. (Refer to Unexamined-Japanese-Patent No. 63-310418).
[0003]
[Problems to be solved by the invention]
The present invention has been developed in view of the above-described conventional technical circumstances, and both heating from the tank wall to the granular material in the storage tank and heating from the inside of the tank using a heated gas are performed. It aims at providing the granular material supply apparatus which can be implemented more efficiently.
[0004]
[Means for Solving the Problems]
In order to solve the above problems, the present invention comprises a storage tank of granular material having a discharge port in the lower part, comprising a double wall having a space between an inner wall and an outer wall, and a heating means is attached to the inner wall, A technical means is adopted in which a gas such as outside air is heated in the space and then flows into the storage tank. Thus, according to the present invention, the tank wall portion is heated by the heating means attached to the inner wall, so that problems such as a temperature drop due to heat radiation from the wall portion are solved, and at the same time, the heating means is moved outward. The granular material can be heated from the inside of the tank by the gas heated by effectively utilizing the heat radiation. Therefore, the granular material in the storage tank can be heated efficiently from inside and outside. In addition, it can comprise so that a granular material may be supplied via the carrying-out means connected to the said discharge port by the attraction | suction effect | action based on the high-speed jet of the pressure fluid for granular material conveyance. In this case, after heating through the space between the inner wall and the outer wall, the gas flowing into the storage tank is sucked together with the particulates to the discharge port side, so the circulation of the heated gas in the tank is promoted. The It is also possible to connect the pressure gas supply pipe for conveying the granular material and the space so as to pressure-feed the gas into the storage tank through the space.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
The present invention can be widely applied to various powder and granular material supply devices such as baking soda as a blasting material for blasting. As the gas that flows into the tank while being heated through the space between the inner wall and the outer wall of the storage tank and heats the granular material from the inside of the tank, the outside air may be used as it is. It is also possible to use a gas that has been subjected to an appropriate treatment such as dehumidifying or adding a static electricity removing function. Regarding the supply of the gas, the gas may be sucked into the storage tank through the space, or may be configured to be pumped into the storage tank under pressure. In addition, regarding the inflow of gas into the space and the flow into the storage tank, it may be configured to flow in from the lower part of the space and flow out from the upper part into the tank. It is also possible to make it flow out from the lower part into the tank. The heating means attached to the inner wall is preferably a planar heater such as a silicon rubber heater, and may be attached to the outer surface side of the inner wall, that is, the space side, or may be attached to the inner surface side, that is, the inside of the tank. May be. In short, by adding the heating means, the granular material is heated from the vicinity of the inner wall in the tank, and the heat radiation to the outside of the heating means is recovered by heating the gas, and then flows into the storage tank and flows into the storage tank. Any material can be used as long as it can improve the overall thermal efficiency. Note that the heating effect can be further improved if the space between the inner wall and the outer wall is partitioned in a spiral manner to increase the gas heating time. Various types of devices such as a screw conveyor can be applied as the carrying-out means for discharging the granular material from the discharge port of the storage tank. Moreover, a suitable stirring means can be arrange | positioned in a storage tank as needed.
[0006]
【Example】
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram showing the main part of one embodiment of the present invention, and FIG. 2 is a partially enlarged view thereof. FIG. 3 is a cross-sectional view taken along the line AA in FIG. In the figure, reference numeral 1 denotes a storage tank, which is formed in a modified inverted quadrangular pyramid shape having a wide inlet closed by a lid 2 at the top and a discharge outlet 3 throttled downward. As shown in an enlarged view in FIG. 2, each wall surface constituting the storage tank 1 is composed of an inner wall 4 and an outer wall 5, and a space 6 serving as a gas passage is formed between the inner wall 4 and the outer wall 5. Double wall structure is adopted. A planar heater 7 is provided on the outer surface side of each inner wall 4, that is, on the space 6 side, and is configured to heat the granular material inside the tank through the inner wall 4. In this embodiment, all the wall surfaces constituting the storage tank 1 have a double wall structure. However, only a part of the wall surfaces has a double wall structure, and the planar heater 7 is provided only on the wall surface. It is. A number of inflow holes 8 communicating with the space 6 are formed in the lower part of the outer wall 5, and a number of outflow holes 9 communicating with the interior of the storage tank 1 are formed in the upper part of the other inner wall 4. Then, as will be described later, the outside air is sucked into the storage tank 1 through the inflow hole 8 and the outflow hole 9. The outside air sucked from the inflow hole 8 is heated by absorbing heat radiated outward from the planar heater 7 when passing through the space 6, and then flows into the storage tank 1 from the outflow hole 9. The internal powder will be heated. In the figure, 10 is an agitation means, and 11 is a drive means for mixing the heated gas composed of the outside air and the like flowing into the storage tank 1 through the space 6 and the powder and more effectively the entire tank. It can be heated on average. Reference numeral 12 denotes a handle of the lid 2.
[0007]
Unloading means comprising a screw conveyor 14 driven by a motor 13 is disposed below the discharge port 3, and is configured to unload powder particles from the storage tank 1 via a discharge tube 15. . The carry-out pipe 15 is connected to a mixing chamber 19 in which pressurized air supplied from a pressurized air supply means 16 such as a Roots blower through a pressurized air pipe 17 is jetted through a nozzle 18 at a high speed. Thus, the powder particles are sucked through the carry-out pipe 15 by the ejector action of the high-speed air flow injected into the mixing chamber 19 through the nozzle 18, and the supply pipe is mixed while the high-speed air flow and the powder particles are mixed. 20 is supplied to a target portion such as an injection nozzle 21 for blasting. In addition, since the inside of the mixing chamber 19 becomes a negative pressure due to the ejector action of the high-speed air flow injected through the nozzle 18 as described above, the inner wall 4 and the outer wall 5 together with the powder particles carried out through the carry-out pipe 15. The heated gas flowing into the storage tank 1 through the space 6 is also sucked and discharged. As a result, new outside air is sucked into the space 6 through the inflow hole 8. In this embodiment, other fluids such as a high-speed water flow can be employed instead of the high-speed air flow. Moreover, since the inside of the storage tank 1 is in a negative pressure state during the supply of the powder, the cover 2 can be opened at an appropriate time including the supply of the powder and the powder can be charged. It is. In the figure, 22 is a vent pipe for sucking and supplying outside air to the mixing chamber 19 as necessary, and 23 is an opening / closing valve thereof.
[0008]
FIG. 4 is a schematic configuration diagram showing the main part of another embodiment of the present invention. This embodiment is a modification of the above embodiment, and the same components are denoted by the same reference numerals. When the gas supply pipe 24 is branched from the middle of the pressure air pipe 17, the inner wall 4 and the outer wall 5 of the storage tank 1 are branched. It has a feature only in that it is configured to be able to forcibly supply a gas such as air by being connected to the space 6 between them, and the same function is exhibited in other points. In this case, if the internal pressure in the gas supply pipe 24 is discarded, the pressure drop due to the flow path resistance of the nozzle 18 and the ejector action of the high-speed air flow injected through the nozzle 18 are eliminated. The internal pressure of the mixing chamber 19 becomes higher by the amount of the negative pressure based on it, and the circulation of the heated gas in the storage tank 1 is further promoted. In other words, in the present embodiment, the heated gas composed of heated air supplied into the storage tank 1 through the space 6 is supplied from the supply pressure of the gas supply pipe 24 and the high-speed air flow injected through the nozzle 18. By the suction action by the ejector action, the granular material is heated while being forced to flow through the storage tank 1 and supplied from the carry-out pipe 15 to the target portion. In this embodiment, since the inside of the storage tank 1 is pressurized, the lid body 2 is configured not to be opened by the internal pressure. For example, as shown in the drawing, the thickness of the lid 2 is increased to increase its own weight or to provide tightening means.
[0009]
【The invention's effect】
According to the present invention, the storage tank has a double wall structure in which a space is formed between the inner wall and the outer wall, and the heating means is attached to the inner wall to heat the granular material from the vicinity of the tank wall, and the heating The heat radiation to the outside of the means is collected by heating the gas, and the powder is heated from the inside of the tank by the heated gas, so the powder is generally effective from inside and outside the storage tank. And the thermal efficiency can be greatly improved. Further, if it is configured so that the granular material is discharged by a suction action based on a high-speed jet of pressure fluid for conveying the granular material and supplied to the target portion, it is heated through the space and then flows into the storage tank. Since the gas to be drawn is sucked to the discharge port side together with the granular material, the circulation of the heated gas in the tank is promoted. Moreover, if the pressure gas for conveying the granular material is configured to be pumped into the storage tank through the space, the flow of the heated gas in the tank can be further promoted.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram showing a main part of an embodiment of the present invention.
FIG. 2 is a partially enlarged view of FIG.
FIG. 3 is a cross-sectional view taken along the line AA of FIG.
FIG. 4 is a schematic configuration diagram showing a main part of another embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Storage tank, 2 ... Cover, 3 ... Discharge port, 4 ... Inner wall, 5 ... Outer wall, 6 ... Space, 7 ... Planar heater, 8 ... Inflow hole, 9 ... Outflow hole, 10 ... Stirring means, 11 ... Drive means, 12 ... handle, 13 ... motor, 14 ... screw conveyor, 15 ... unloading pipe, 16 ... pressure air supply means, 17 ... pressure air pipe, 18 ... nozzle, 19 ... mixing chamber, 20 ... supply pipe, 21 ... Injection nozzle, 22 ... vent pipe, 23 ... on-off valve, 24 ... gas supply pipe

Claims (3)

The powder storage tank having a discharge port in the lower part is composed of a double wall having a space between the inner wall and the outer wall, and heating means is attached to the inner wall, and gas such as outside air is heated in the space. After that, it is configured to flow into the storage tank. The granular material supply apparatus according to claim 1, wherein the granular material is supplied through a discharging means connected to the discharge port by a suction action based on a high-speed jet of pressure fluid for conveying the granular material. The granular material supply apparatus according to claim 1 or 2, wherein a pressure gas supply pipe for conveying granular material is connected to the space, and the gas is pumped into the storage tank through the space.

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