JPS63204092A - Vacuum rotary drier - 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] [Industrial Application Field] The present invention relates to drying technology and mixing technology for powder and granular materials,
This invention relates to a double cone type rotary vacuum dryer that has a powder mixing function and has excellent mixing efficiency.

[Conventional technology]

Conventionally, a double cone type rotary vacuum dryer, which dries the contents by flowing a heat medium into the double walls of a rotating drying chamber, has been used as a drying device for powder and granular materials. The machine does not have a mixing function, but is designed to dry while rotating the drying chamber, and the powder or liquid to be dried is mixed in advance through the input/output port opened on the side wall of the drying chamber. The structure is such that it is discharged after drying. Therefore, when using this device as a mixer using its rotation function, or when it is necessary to add powder or fluid during the mixing process, open the input and discharge ports each time to add additives in batches. This has to be done by processing, making it difficult to fully automate the process, and also having the problem that each opening comes into contact with air, which prevents uniform mixing and makes quality control difficult.

[Problem that the invention seeks to solve]

In other words, conventional devices only have a drying function, and are structurally mixed ("mixing" as described in the present invention refers to techniques for mixing multiple powders and granules, for example, coating the surface of a fluid with other substances). Coating technology.

It also includes granulation technology. ) had no function.

The present invention was developed in view of the above problems, and is used as a dryer that can dry powder and granular materials under vacuum and obtain stable high quality without thermal decomposition or thermal deterioration through low-temperature vacuum drying. To provide a vacuum rotary dryer which can be used as a mixer, can freely charge additive powder, additive liquid, etc. in a sealed state in a mixing process, and can uniformly mix them. The purpose is to

[Means for solving problems]

That is, the rotary vacuum dryer according to the present invention has a can body with an airtight lid that can be opened and closed on the negative side, and a jacket that is spaced around the outer periphery of the can with the input and output ports opened, thereby forming a hot water and hot air circulation chamber. The double-structured can body is horizontally mounted on a shaft via shafts protruding from both ends of the shaft core.

The structure is rotated by a rotary drive motor, and hot air/hot water supply/drainage piping that leads to the hot air/hot water distribution chamber is communicated with the outside via a rotary joint provided on the shaft body, and the can body is connected to the can body. Introducing a number or a plurality of feed tubes for adding granular material or fluid having an inner end open into the lumen of the shaft body through an exhaust communication tube formed through the shaft body, It is constructed by connecting an external vacuum device.

[Created for]

Therefore, when using the device of the present invention as a dryer or granulator, after charging the powder to be dried into the can through the input/discharge port, close the input/discharge port and rotate the can with the shaft as a pivot. Drying is carried out while being rotated by a drive motor, and hot water at an appropriate temperature is supplied from hot water supply and drainage piping.
The powder is introduced into a hot air distribution room and heated to dry through the wall of the can. Since the inner cavity of the can body is depressurized by a vacuum device via an exhaust communication pipe, drying is performed in a vacuum and low temperature drying is possible, resulting in a stable product of high quality without thermal decomposition or thermal deterioration. It will be done.

When used as a mixer, after charging the powder and granules to be mixed into the can from the input/discharge port, close the input/discharge port and mix while being rotated by a rotary drive motor using the shaft as a pivot. It is something to do.

When adding powder, granules or liquid during the mixing process, the powder or liquid is introduced or sprayed into the inner cavity of the can through the feed pipe, and after mixing, the powder or liquid is It will now be discharged from the exit.

By configuring a joint chute that faces the input/discharge port and automatically joins when discharging the drying or mixing, it is possible to input/discharge the powder or granular material without contacting with the outside air. can.

〔Example〕

An embodiment of the vacuum rotary dryer of the present invention will be described below with reference to the drawings.

The drawings show one embodiment of the present invention, and reference numeral 1 denotes a double-layer structure in which a jacket 3 is spaced around the outer periphery of a can body 2 made of stainless steel or carbon steel to form a hot water/hot air circulation chamber 4. It is a can body with a structure, and one side of the can body 1 has an input/output port 1 provided with an airtight lid 13 that can be opened and closed freely.
Open 4.

A rotary tube shaft 5 and a rotary shaft 6 protruding from both ends of the shaft core of the can body 1
Bearing devices 9 for supporting frames 8 and 8, respectively erected on a base 7,
10 is provided with a horizontal shaft and is rotatably supported, and a drive gear 11 that is rotatably mounted on the rotating shaft 6 is rotatably connected to a rotary drive motor 12 via an appropriate drive transmission mechanism such as a speed reducer. Become.

The rotary tube shaft 5 has a shaft sealing mechanism 15 such as a gland packing.
An exhaust communication pipe 16 is rotatably and airtightly inserted through the can body 2, and a branch pipe 17 protruding from one side near the end is connected to an external vacuum device (not shown) and inside the can body 2. A suction unit 19 provided with a filter device 18 is configured to constitute a vacuum suction mechanism that suctions and depressurizes the inside of the can body 2 to a predetermined degree of vacuum.
An additive water pipe 21, an additive liquid pipe 22, two atomizing air pipes 23, 24, an additive powder pipe 25, and two twenty-one dollar valves communicate from a port board 20 arranged in parallel at the end of the exhaust communication pipe 16. The powder pipe 25 is inserted into the nozzle pipe 28.
The additive liquid pipes 22 are in communication with spray nozzles 29, respectively.

The other rotating shaft 6 connects an air pipe 31 and a hot water pipe 32 to an air supply pipe 33. The hot water pipe 32 communicates with the hot water/hot air distribution chamber 4 of the can body 1 via a valve (not shown) that is operated by air pressure from the air pipe 31. It consists of

The vacuum rotary dryer having the above structure rotates the can body 1 to dry or mix the cans. First, the drying action will be explained.

After the powder to be dried is charged into the can body 2 through the input/output port 14, the airtight lid 13 is closed and the powder is dried while being rotated by the rotary drive motor 12 using the one-turn tube shaft 5 and the rotary shaft 6 as spindles. The input/discharge port 14 has an external valve (not shown) that is automatically opened/closed using air to prevent powder leakage during input/discharge.

In addition to having a structure that prevents dust generation, the input/output port 14
By configuring a joint chute that faces and automatically joins, it is possible to charge and discharge powder and granular material without contacting with the outside air.

The can body 1 introduces hot water at an appropriate temperature from the hot water supply and drainage piping 34 into the hot water/hot air distribution chamber via the hot water piping 32, and heats and dries the granular material to be dried through the wall surface of the can body 32. The inner cavity of the can body 2 is an exhaust communication pipe 16. Branch pipe 1
Since the pressure is reduced by a vacuum device through the
A stable product of high quality without thermal deterioration etc. can be obtained.

Next, when the vacuum rotary dryer is used as a mixer, the powder and granules to be mixed are introduced from the input/output port 14 and mixed while rotating in the same way as in the drying process, and in the mixing process, the powder and granules are mixed. When adding powder, it is introduced into the inner cavity of the can body 2 from the nozzle pipe 28 through the addition powder pipe 25, and when filling water or liquid, it is introduced into the spray nozzle 29 through the addition water pipe 21.
It has a structure in which it is dispersed into the inner cavity of the can body 2.

Therefore, in the process of mixing powder and granules to be mixed, the powder or liquid can be easily added, and uniform mixing can be achieved by controlling the flow rate of the added material, thereby obtaining a high quality mixed powder and granule. Can be done.

In the explanation of the above embodiments, a dryer and a mixer that are used separately have been described, but a mixer that mixes the contents of the can with additive powder or liquid during the drying process and performs a granulation or coating function. Needless to say, it can be used as a machine.

〔Effect of the invention〕

As described above, the vacuum rotary dryer according to the present invention includes a double cone type rotary dryer including an additive feed pipe for adding powder, granules and liquid, and a fluid feed pipe for operating the valve of the feed pipe. By inserting the exhaust communication pipe into the inner cavity of the can body, the device can be used as a dryer or a mixer. In addition, the addition operation of other powders and liquids to be added in the mixing process is extremely simple, and since the can body is not opened during addition, quality control is excellent. Furthermore, the vacuum rotary dryer of the present invention not only has a mixing function of mixing multiple powders and liquids, but also can add and mix during the drying process, so it can mainly perform granulation, liquid addition, coating, etc. Since it can also be used as a target device, it has extremely excellent features such as exhibiting multipurpose functions, and the practical effects after implementation of the present invention are extremely large.

[Brief explanation of the drawing]

Figure 1 is a front view showing the entire device, Figure 2 is a right side view of the same,
FIG. 3 is an enlarged sectional view showing the rotating tube shaft. Figure 4 is a sectional view taken along line A-A in Figure 3, and Figure 5 is a cross-sectional view of Figure 3.
BB line sectional view in the figure, Figure 6 is C in Figure 3.
-C line sectional view, and FIG. 7 is an enlarged sectional view showing the rotating shaft portion. 1...Can body 2...Can body 3...Jacket 4...Hot water/hot air distribution chamber 5...Rotating tube shaft 6...Rotating shaft 9.10...Bearing assembly @
11... Drive gear 12... Rotation drive motor 1
4...Input/discharge port 16...Exhaust communication pipe 18
... Filter device 21 ... Addition water pipe 22.
... Additive liquid pipe 23.24 ... Air pipe for spraying 25...
・Additional powder pipe 26.27... Air pipe for needle valve 28... Nozzle pipe 29... Spray nozzle 30
...Rotary joint 31...Air piping 32...Hot water piping 33.
...Air supply piping 34...Hot water supply and drainage piping Diagram 2

Claims (1)

[Claims] The can body has a double structure, with an airtight lid that can be opened and closed on one side, and a jacket that surrounds the outer periphery of the can body at a distance to form a hot water/warm air circulation chamber. A horizontal shaft is installed via shaft bodies protruding from both ends of the shaft core, and the structure is such that it is rotated by a rotary drive motor, and the hot air/hot water supply and drainage piping that leads to the hot air/hot water distribution chamber is connected to the shaft. One or more inlet pipes for adding powder or fluid are formed through the shaft, communicating with the outside through a rotary joint provided in the can body, and opening the inner end into the inner cavity of the can body. A rotary vacuum dryer characterized in that the vacuum dryer is introduced through an exhaust communication pipe, and the end of the exhaust communication pipe is connected to an external vacuum device.