JPH0679201A - Fine powder recovery device of cyclone in dryer - Google Patents

Abstract

PURPOSE:To save labor in fine powder recovery work by providing a damper that closes or interclocks the inside of a cyclone and a fine powder recovery port and a lifting truck that is raised until the fine powder recovery port is pressed and lowered by the upper edge part of a recovery can through a packing material. CONSTITUTION:With the inside of a cyclone 9 and a fine powder recovery port 18 closed by a damper 22, a lifting truck 27 on which an empty recovery can 24 is mounted is arranged just under the fine powder recovery port 18 and the recovery can 24 is raised by a lifting mechanism 26, causing an upper edge part 24a of the recovery can 24 to be pressed on a packing material 23 of the fine powder recovery port 18, permitting airtightness to be maintained. And with the inside of the cyclone 9 and the fine powder recovery port 18 interlocking with each other by the damper 22, the fine powder is recovered in a recovery can 24. And when the fine powder in the recovery can 24 reaches a specified quantity, the fine powder stops falling with the inside of the cyclone separated by the damper 22. Next, the recovery can 24 is made to fall by the lifting mechanism 26 to remove it and the lifting truck 27 is run to transfer the recovery can 24.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drying device for producing powder or the like, which is a raw material for a sintered product, from a slurry.

[0002]

2. Description of the Related Art FIG. 4 shows a conventional example of a dry granulating apparatus called a spray dryer for producing a raw material powder of a sintered product used for a cemented carbide tool or the like. In this apparatus, powders of raw materials tungsten carbide, cobalt, and other additives are mixed in a liquid (for example, a liquid such as methanol having a low boiling point) in a slurry form in a wet mixer 1 and stored in a tank 3. Further, it is sprayed from the injection nozzle 5 into the drying tower 6 by the pump 4.
The broken line in the figure indicates the direction of the slurry ejection in the drying tower 6.

The drying tower 6 is supplied with a drying gas obtained by heating an inert gas such as nitrogen in order to volatilize the liquid from the sprayed slurry. The supply of the drying gas is performed via the gas supply pipe 7 in the upper part of the drying tower 6. A path for supplying the drying gas to the gas supply pipe 7 will be described. The gas extracted from the gas discharge pipe 8 is separated into fine powder in the cyclone 9, and is sent to the bag filter 11 by the fan 10 to remove the powder content, and is sent to the condenser 12 to liquefy and recover the vapor of the liquid. Further, after being sent to the heater 14 by the fan 13 to be heated, the gas supply pipe 7
It is sent into the drying tower 6 via.

The drying gas thus sent to the upper portion of the drying tower 6 comes into contact with the slurry which is jetted upward from the jet nozzle 5 and drops to volatilize the liquid. As a result, the liquid in the slurry is contained as vapor in the dry gas and is discharged from the gas discharge pipe 8, while the solid content in the slurry falls while being shaped into particles of a constant diameter, and the drying tower 6 is discharged downward from the lower part of the cooling device 1
After being cooled by 5, the automatic filling machine 16 fills a bag or a container with a predetermined amount.

By the way, inside the cyclone 9 described above, fine powder separated from the dry gas of the drying tower 6 drawn out from the gas discharge pipe 8 is accumulated, and as a device for collecting the fine powder from the cyclone, FIG. As shown in
A collection container 17 is attached. That is, the recovery container 17 is a container made of a metal having a bottomed cylinder and provided with the flange 17a on the upper peripheral edge. Then, the flange 17a is attached to the flange 18a of the fine powder recovery port 18 which opens downward at the bottom of the cyclone 9.
Is a container for exclusive use of the cyclone, which is attached to the lower portion of the cyclone 9 in a state where airtightness with the outside is maintained by bringing the flanges 17a and 18a into contact with each other with bolts 20 ...

Then, the cyclone 9 is placed inside the recovery container 17.
It usually takes about 4 hours to reach a predetermined amount of fine powder collected from (collection of the fine powder in the collection container 17), so the work of exchanging with an empty collection container is performed about three times a day, Since it is a dedicated container, it is either transferred to another container or possesses many dedicated containers.

[0007]

By the way, the recovery container 1
When a predetermined amount of fine powder is collected in 7, the weight of the collection container 17 becomes about 40 Kg. Therefore, when the recovery container 17 is removed from the cyclone 9, one worker holds the recovery container 17 while another worker holds the bolt 20 ...
It was a very laborious and labor-intensive removal work of removing the. Further, the operation of transferring the removed recovery container 17 to another container and transferring it to another place (fine powder storage place, etc.) is also performed manually, and labor saving of the fine powder recovery work from the cyclone 9 has been desired.

Further, in the conventional apparatus, when removing the recovery container 17 from the cyclone 9, the operation of the drying apparatus had to be temporarily stopped, and there was a problem in the production efficiency of the raw material powder.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a cyclone fine powder collecting apparatus in a drying apparatus capable of saving labor in the work of collecting fine powder from a cyclone. .

[0010]

In order to achieve the above object, the present invention provides a drying apparatus for recovering powder in a slurry by supplying a drying gas into a drying tower and spraying the slurry. A device for recovering fine powder from a cyclone provided in a line for discharging a drying gas in a tower, provided at the upper part of the fine powder recovery port opening at the bottom of the cyclone, and the cyclone inside and the fine powder recovery port. A damper for blocking or communicating with each other, a packing material having a predetermined wall thickness attached to the lower surface of the fine powder collection port, a cylindrical collecting can with a bottom for collecting fine powder, and a collecting can placed to collect fine powder. A travelable lift truck that is disposed immediately below the mouth and has a lifting mechanism that raises the collection canister and lowers the collection canister until the upper edge of the collection canister presses the fine powder collection port through the packing material. Ingredient It is to become the apparatus.

[0011]

With the above construction, when the inside of the cyclone is closed by the damper and the fine powder collection port is closed, an elevator trolley with an empty collection can is placed directly below the fine powder collection port, and the lifting mechanism moves the collection can. By ascending, the operation of attaching the recovery can to the fine powder recovery port of the cyclone is completed while the upper edge of the recovery can is pressed against the packing attached to the fine powder recovery port to maintain airtightness. Then, the fine powder separated from the drying gas flowing into the cyclone is recovered in the recovery can from the fine powder recovery port in a communication state between the inside of the cyclone by the damper and the fine powder recovery port.

Further, when the amount of fine powder in the recovery can reaches a predetermined amount, the fine powder is stopped from falling into the fine powder collection port in a closed state by the damper. In this state, the lifting and lowering mechanism lowers the collection can to complete the removal operation of the collection can from the fine powder collection port. Then, by moving the lift truck to another place, it is possible to easily transfer the recovery can containing the fine powder.

[0013]

Embodiments of the present invention will be described below with reference to FIGS. In the figure, the same parts as those in the conventional example are designated by the same reference numerals to simplify the description.

In this embodiment, as shown in FIG.
Fine powder passage 21 above the fine powder recovery port 18 of the cyclone 9
The damper 22 is provided in the.

This damper 22, as shown in FIG.
It is connected to the tube forming the fine powder passage 21.

When the damper 22 is closed, the fine powder separated from the drying gas in the cyclone 9 is blocked by the damper 22 and does not drop downward (to the fine powder recovery port 18 side). When the damper 22 is opened, the closed state of the fine powder passage 21 is released, and the fine powder in the cyclone 9 can drop to the fine powder collection port 18 side.

On the lower surface of the flange 18a of the fine powder recovery port 18, a thick member (5) formed of a plate member made of rubber or the like is used.
A packing material 23 having a thickness of 50 mm to 50 mm is attached.

Further, directly below the fine powder recovery port 18, a self-propelled lift truck 27 having a lift mechanism 26 for vertically moving the mounting table 25 on which the recovery can 24 is mounted is disposed. That is, the recovery can 24 is a can (for example, a pail can) made of a metal and having a bottomed cylindrical shape, and the peripheral portion 24 thereof.
The diameter of a is set to be larger than the inner diameter of the flange 18a of the fine powder recovery port 18 and smaller than the outer diameter of the flange 18a.

The lift truck 27 has a pusher 27 on the side of a base 27b having casters 27a ...
c is connected, and the lifting mechanism 2 is provided above the base.
6 is a structure in which the mounting table 25 is disposed on the upper part of the table 6.

The elevating mechanism 26 is a long link member 26.
a and 26a are linked by the connecting portion P, and the connecting portion P
When the link members 26a, 26a rotate about the fulcrum, the upper end portions 26b, 26b are moved in the vertical direction. Mounted table 25
Moves up and down. Although not shown, the raising / lowering operation of the raising / lowering mechanism 26 is performed by manual operation or automatic operation using a drive motor or the like.

Next, a procedure for mounting the fine powder collecting apparatus having the above-mentioned structure on the cyclone 9 will be described. First, the inside of the fine powder passage 21 is closed by the damper 22. And empty collection can 24
The lift truck 27, which is mounted on the mounting table 25, is attached to the fine powder recovery port 1
It will be transferred to just below 8. Then, by the raising operation of the elevating mechanism 26, the mounting table 25 is raised until the peripheral edge portion 24 a of the recovery can 24 comes into contact with the packing material 23. And
Further, the lifting mechanism 26 is lifted. This allows
The packing can 23 is mounted on the collecting can 24 while being pressed upward by the peripheral edge portion 24 a of the collecting can 24. Then, the blockage of the fine powder passage 21 by the damper 22 is released.

As a result, as shown in FIG. 2, the cyclone 9 and the recovery can 24 communicate with each other while maintaining the airtightness of the contact portion between the fine powder recovery port 18 and the recovery can 24. Then, the fine powder separated from the drying gas inside the cyclone 9 passes through the fine powder passage 21 and is collected in the collecting can 24. Further, when the recovery can 24 is attached, the cyclone 9 and the fine powder recovery port 18 are blocked by the damper 22,
The drying device can be operated continuously.

On the other hand, in order to remove the recovery can 24 from the cyclone 9, as shown in FIG. 3, the fine powder passage 21 is closed by the damper 22 and the elevating mechanism 26 is lowered.
As a result, the collecting can 2 that has been pressed against the packing material 23
4 goes away. Then, a collection can 2 from the cyclone 9
The lift truck 27 from which No. 4 has been removed is moved to the fine powder storage location by rolling the casters 27a using the hand pushing portion 27c, and the fine powder inside the recovery can 24 is discharged to the fine powder storage location.

Then, the lift truck 27 on which the empty collecting can 24 is placed is again moved to just below the cyclone 9, and is attached to the fine powder collecting port 18 of the cyclone 9 by the procedure described above.
In addition, the lift truck 27 in which the collecting can 24 is placed on the placing table 25
It is also possible to prepare at least two of the above and remove the collecting can 24 in which the fine powder is collected, and immediately after that, use the other lift truck 26 to mount the empty collecting container 24.

In this embodiment, the mounting table 2 is previously prepared.
A weight sensor for measuring the weight of the recovery can 24 placed on the vehicle 5 is provided, and when the weight sensor shows a predetermined value, the damper 22 is automatically operated by an instruction signal from the weight sensor. If the structure is such that the opening / closing operation is performed and the elevating mechanism 26 automatically descends, the efficiency of the fine powder collecting operation of the cyclone 9 can be further improved.

Of course, the specific construction of the lifting mechanism 26 is not limited to the embodiment.

[0027]

As is apparent from the above description, according to the present invention, the empty recovery can is cycloneed by merely raising or lowering the elevating mechanism of the lift truck disposed directly below the fine powder recovery port. Since it is possible to perform the operation of attaching to the fine powder collection port of the above and the operation of removing the collection can with a predetermined amount of fine powder collected from the cyclone, it is possible to save labor of fine powder collection work without requiring much labor and effort. it can. Further, simply by moving the lift truck, the collection can in which the fine powder is accumulated can be easily transferred to another place without the trouble of transferring.

Further, since the damper is provided so that the inside of the cyclone and the fine powder recovery port can be closed, the empty recovery to the fine powder recovery port is performed by operating the drying device by closing the damper. The cans can be attached or the collection cans can be removed, and the operation efficiency of the drying device can be improved.

[Brief description of drawings]

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

FIG. 2 is a partial cross-sectional side view showing a state where a recovery can is attached to a cyclone in the present invention.

FIG. 3 is a partial cross-sectional side view showing a state where the recovery can is detached from the cyclone in the present invention.

FIG. 4 is a piping diagram showing a conventional example of a drying device.

[Explanation of symbols]

 6 Drying tower 8 Gas discharge pipe 9 Cyclone 18 Fine powder recovery port 18a Flange 21 Fine powder passage 22 Damper 23 Packing material 24 Recovery can 25 Mounting table 26 Lifting mechanism 27 Lifting truck 24a Recovery container peripheral edge 27a Caster 27b Base

Claims (1)

[Claims] 1. A drying apparatus for supplying a drying gas into a drying tower and spraying the slurry to recover the powder in the slurry, the drying apparatus being provided in a line for discharging the drying gas inside the drying tower. A device for recovering fine powder from a cyclone, which is provided above the fine powder recovery port that opens at the bottom of the cyclone, and a damper that closes or connects the interior of the cyclone and the fine powder recovery port, and the fine powder recovery port A packing material having a predetermined wall thickness attached to the lower surface, a bottomed cylindrical collecting can for collecting fine powder, the collecting can is placed and arranged directly below the fine powder collecting port, A drier comprising a movable carriage having an elevating mechanism for raising the collecting can and lowering the collecting can until the upper edge of the collecting can presses the fine powder collecting port through the packing material. Fine collection transfer device of kicking cyclone.