JPS5864480A - Drier for metallic powder - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a metal powder drying device, and more particularly to a dry fla device for drying metal powder moistened with water by a spraying method or the like.

Metal powder drying equipment generally has a drying container that receives metal powder, dries the metal powder by vaporizing moisture in the drying container by heating, and removes the resulting moisture through a discharge passage. A gas re-supply passageway including a blower in the middle of the dry gas is introduced into a cooling container, and the water vapor in the damp gas is condensed by sprinkling water on the damp gas in the cough cooling container, and the dry gas is transported from the cooling container. The liquid is supplied to the drying container. In addition, the water supplied to the cooling container is resupplied through a water circulation path including a water tank in order to prevent pollution and save water.

The water circulation path is shared with the gas circulation path in the cooling container, so if part of the water circulation path is open to the atmosphere, the airtightness of the cooling container will be broken and the blower will When the air is sucked in from the open part of the cooling container, the moisture in the cooling container is well vented (no longer done), and the gas is a special gas containing nitrogen to prevent oxidation of metal powder. The loss of gas becomes large.

Therefore, the water circulation passage in the drying apparatus as described above, including the water tank, has an airtight structure.

By the way, the moisture introduced into the cooling container often contains fine metal powder, and the gold and metal powders are deposited in the cooling container together with water through the water circulation passageway in the water tank. For this reason, aquariums must be cleaned regularly to remove the deposits, but if the aquarium has a sealed structure as described above, cleaning becomes troublesome and takes a long time. .

SUMMARY OF THE INVENTION In view of the above-mentioned problems with conventional metal powder drying devices, it is an object of the present invention to provide a metal powder drying device that is improved so that periodic cleaning of a water tank can be carried out easily and efficiently.

According to the present invention, this purpose is achieved by 8! a drying container for receiving moistened metal powder; a heating means for vaporizing moisture in the drying container; a discharge passage for discharging moisture in the drying container to the outside of the drying container; a cooling container that is supplied with moisture from the discharge passage and is sprinkled with water from the water tank so that water vapor in the moisture is condensed by contact between the moisture and water; a gas re-supply passage including a blower in the middle to re-supply the gas from the cooling container to the drying container; and a water return passage which returns the water from the cooling container to the water tank; The outlet end of the return passage to the water tank is connected to the metal powder drying device, which is located at a position lower than the standard water level of the cough water tank.

According to this configuration, even if the aquarium is an upward-opening type and does not have a sealed structure, the outlet end of the water return passage to the aquarium is located at a level 1 lower than the standard water level of the aquarium, that is, the aquarium is always closed. Due to its location in the water,
The airtightness of the cooling container is maintained, the blower in the gas resupply passage does not blow outside air from the middle of the water circulation passage, and the water tank is of an upward-opening type, making cleaning the water tank easy. Moreover, it is carried out efficiently and maintainability is improved.

When electrical objects condense in the exhaust passage, the fine metal powder contained in the moisture adheres to the inner wall of the exhaust passage, constricting the cough passage and, in extreme cases, completely blocking the passage. Therefore, it becomes impossible to exhaust the moisture, and there is a risk that the metal powder in the drying container will not be sufficiently dried.

A detailed feature of the invention is that the amount of moisture flowing through the discharge passage is
The exhaust passage is heated to keep the moisture content above the dew point of the cough moisture, thereby preventing metal powder from sticking to the wall of the exhaust passage, and improving the moisture content of the drying container to be constantly exhausted. Dry metal powder! It is to provide.

The invention will now be described in detail by way of example embodiments with reference to the accompanying drawings.

The attached figure is a schematic diagram showing one embodiment of the metal powder drying @pupil according to the present invention. In the figure, reference numeral 1 indicates a drying container, which has a cylindrical shape and constitutes a substantially closed drying chamber 2 therein. The dryer 11 rotates around its own axis and is connected to the screw conveyor 3.
Metal powder moistened with water is supplied into the drying chamber 2 by the drying chamber 2, and is heated by steam flowing through a locally provided steam pipe 4.

The water supplied into the drying chamber 2 together with the metal powder is heated and vaporized, thereby drying the metal powder and collecting it in the metal powder uncollected container 7 via the outlet 5 and the hopper 6.

The drying container 11 is provided with a moisture exhaust port 8 for discharging the gas containing the most water vapor, that is, moisture generated in the drying chamber 2, and the moisture exhaust port is connected to a discharge conduit 9. It is connected to the cooling container 110 by.

In addition, in the middle of the discharge pipe 9, there is a heater for heating the discharge pipe.
& device 34 is provided. The heating device 34 is composed of an electric band heater or the like, and is used to heat the moisture flowing through the discharge pipe 9. The temperature of the moisture body is maintained at a concentration of 1 lya or more.

The cooling container 10 constitutes a closed cooling chamber 11 extending in the vertical direction, and water spray 112 is provided at the upper part of the cooling chamber.
have. The water stored in the water tank 13 is used for the watering 1112 in spring! ! 14, pump 15, dedicated pipe 16, cooling tower 17, guide I! 18, a pump 19, and a dedicated pipe 20 to supply cold water. Further, a filter 35 is provided in the cooling chamber 11, a water spray 112 is provided above the filter 35, and an outlet end 9a of the exhaust pipe 9 is provided below. The cooling container 10 has a gas outlet 21 at its upper end and a water outlet 22 at its lower end.

The gas outlet 21 includes a conduit 23, an air volume control valve 24, a dedicated pipe 25,
Gas inlet 2 of drying container 1 via blower 26 and conduit 27
8 is connected.

The water outlet 22 of the cooling vessel 10 is connected to the water tank 13 by a water return conduit 29 . Under normal conditions, the water tank 13 always stores water up to the water level shown (standard water level).
The outlet end 29a of the water return conduit 29 is located at a position lower than its standard water level, and is submerged when the water tank 13 is filled with water up to its standard water level.

The aquarium 13 is configured as an upper Sekiguchi-type aquarium with an opening at the top, and has a twin shape including a first aquarium 13a and a second aquarium 13b, and the first aquarium and the second aquarium communicate with each other at the upper part. are doing. A filter 30 is installed between the first water tank 13a and the second water tank 13b. The conduit 14, which is a raised pipe of the pump 15, is suspended in the second water tank 13i1,
It is designed to suck up water from the second tank. A waste collection pan 31 is arranged in a part of the first water tank 13a. The waste collection pan 31 is lifted by the chain 32 @
1133, and can be selectively lifted above the water tank 13 by a lifting device.

Highly humid gas, that is, moisture, generated in the parrot drying chamber due to the evaporation of moisture in the drying chamber 2 is transferred to the drying chamber 2 from the gas inlet 28.
As the gas is supplied inside, it is discharged to the cooling chamber 11 from the moisture discharge port 8 through the discharge 11111!9. This moisture gas contains a part of the fine metal powder among the metal powders supplied into the drying chamber 2 by the screw conveyor 3, and therefore, this moisture gas is cooled while flowing through the discharge pipe. When dew condenses, the metal powder contained in the dehumidifying gas is discharged! Although there is a risk that the moisture may get trapped on the inner wall surface of the exhaust pipe IF 9 and block it, since the exhaust pipe 9 is heated by the heating device 34, the moisture will flow through the exhaust pipe IF 9.
It flows into the cooling chamber 11 without condensation during the process.

The cooling chamber 11 is sprayed with water from a water sprinkler 112, and the moisture body is cooled by contact between the water and the moisture body.
The water vapor in the cough water condenses and becomes water, which flows together with the water from the sprinkler 112 (from the water outlet 22 through the water return guide ! 29 to the first water tank 13a).

As a result, the moisture becomes dry gas, which passes through the filter 35 to the gas outlet 21. ! 23, [1M11 valve 24,
Guide! The dry gas is sucked from the gas inlet 28 through the conduit 27, and the air blower 126 sends the dry gas through the conduit 27
The drying chamber 2 is then resupplied.

If the flow rate of the gas flowing through the drying chamber 2 is determined according to the drying capacity of the metal powder, the amount of fine metal powder discharged together with the moisture gas will be reduced, and the yield of metal powder in the drying process will be reduced. Furthermore, the quality of the metal powder is improved and stabilized, and the maintainability of the drying process is improved.

In the illustrated drying apparatus, the air volume of the gas flowing through the drying chamber 2 is appropriately determined by the air volume control valve 24 in accordance with the drying capacity of the metal powder. This air volume adjustment may be performed by changing the rotation speed of the blower 26.

The metal powder that flowed out of the drying chamber 2 together with the moisture is transferred to the cooling chamber 1.
1 flows into the first water tank 13a together with water and is deposited on the waste collection pan 31. This deposit must be removed periodically, and in the metal powder drying scissors according to the present invention,
Since the water tank 13 has an upward opening type, the lifting device 3
3, the waste collection pan 31 is pulled up above the water tank, thereby facilitating the removal of deposits.

Since the water tank 13 is of an upward opening type, the upper part of the water tank 13 is open to the atmosphere, but the outlet end 29a of the water return pipe 29
is located underwater in the aquarium 13, so that the aquarium 13
The airtightness of the cooling chamber 11 is not broken, and the blower 2
The negative pressure generated on the downstream side by the air blowing action of 6 effectively acts on the moisture discharge port 8, and also acts on the drying chamber 2-exhaust pipe 9.
- Cooling room 11 - Direction 1! 23 - Air volume ■ Selection valve 24 - 111F
25-Blower 26-If a large amount of outside air does not flow into the gas circulation passage formed by the I pipe 27, and this gas is a special gas containing a large amount of nitrogen, the nitrogen concentration may drop significantly. Without nitrogen, most of the yellowing is kept in low armor.

In addition, the water in the water tank 13 is taken out from the second water tank 13b separated by the filter 30 from the first water tank 13a to which water is returned from the cooling chamber 11. Easy maintenance of pumps and conduits.

Although the present invention has been described in detail above with reference to specific embodiments, it is understood by those skilled in the art that the present invention is not limited thereto, and that various embodiments can be made within the scope of the present invention. It would be obvious for

[Brief explanation of drawings]

The attached figure is a schematic diagram showing one embodiment of a metal powder drying apparatus according to the present invention. 1... Drying container, 2... Drying room, 3... Screw conveyor, 4... Steam pipe, 5... Outlet, 6...
Hopper, 7...Metal powder uncollected container, 8...Moisture gas outlet, 9...Discharge 1111.10-...Cooling container,
11... Cooling room, 12... Water sprinkler, 13... Water tank, 14... Conduit, 15... Pon 1.16... Conduit, 17... Cooling tower, 18... Conduit , 19
Pump, 20- Conduit, 21... Gas 0.
22... Water flow 0.23... Conduit, 24-... Fukan control valve, 25... Conduit, 26-... Air blower, 27-11
1! . 28...Gas filled 0.29...Water return conduit, 30...
- Filter, 31...Waste collection pan, 32... Chain. 33... Lifting device, 34... Heating device, 35...
・Filter patent applicant Toyota Automatic Kushi Industries Co., Ltd.
Attorney Patent Attorney Akashi 8
@36-

Claims (2)

[Claims] (1) A drying container for receiving metal powder moistened with water, a heating means for vaporizing the moisture in the drying container, and discharging the moisture in the drying container to the outside of the cough drying container. A water tank with an upward opening for storing water, and a moisture supply passage from the discharge passage. a cooling container which is sprayed with water from the water tank and which condenses water vapor in the damp material by contact between the damp material and the water, and a blower device disposed in the middle of the container; It has a gas resupply passage to re-supply the gas to the container, and a water return passage that returns water from the cooling container to the water tank, and an outlet end of the water return passage to the water tank is located at a position lower than the standard water level of the water tank. A metal powder drying device characterized in that: (2) In the water ii! a drying container for receiving moistened metal powder; a heating means for vaporizing the moisture in the drying container; a discharge passage for discharging the moisture in the drying container to the outside of the cough drying container; WAi! a heating means for heating the discharge passage to maintain the temperature at or above the dew point temperature of the gas; an upward-opening water tank for storing water; and a humid body supplied with moisture from the discharge passage and sprinkled with water from the water tank. a cooling container that condenses water vapor in a humid gas by contact with water; a gas resupply passageway that includes a blower device in the middle and resupplies the gas in the cooling container to the drying container; a water return passage for returning water from the water container to the water tank, and an outlet end of the water return passage to the water tank is located at a position lower than the standard water level of the water tank. .