JPH0638028B2 - Rotary dryer - Google Patents

Description

TECHNICAL FIELD The present invention relates to a drying technique, a mixing technique, and a granulating technique for powder particles, and particularly to powder particles on an inner wall of a dryer when mixing powder particles. The present invention relates to a double cone type rotary dryer that prevents body adhesion and has an excellent mixing function.

[Prior Art] Conventionally, a double-cone type rotary vacuum dryer has been used as a dryer for powder and granules, in which a heating medium is introduced into a double wall of a rotating drying chamber to dry the contents. This kind of rotary vacuum dryer does not have a mixing function, but has a structure that dries while rotating the drying chamber, and the input / exhaust port that opens the dried powder or granules or liquid on the side wall of the drying chamber. From the above, the structure is such that the mixture is charged in advance and then discharged after the drying process. Therefore, when using as a mixer using the rotation function of this device,
Or, if it is necessary to add powder or fluid in the mixing process, it is necessary to open the charging / discharging port each time and carry out the charging of the additive by batch processing, which makes complete automation difficult and Each opening comes into contact with air, and there is a problem that quality control becomes difficult at the same time that the mixing is not uniform. Further, this type of dryer has drawbacks such that the powder adheres to the inner wall of the drying chamber to cause abnormal heating, and the mixing rate varies.

[Problems to be Solved by the Invention] That is, a conventional apparatus has only a drying function, and structurally mixes (“mixing” described here is a technique of mixing a plurality of powder and granular materials and, for example, of a fluid). It also includes coating technology and granulation technology for coating the surface with other substances.)
In addition to having no function, even if only the drying function was observed, uniform results could not be obtained due to the adhesion of the material to be dried to the wall surface.

The present invention has been made in view of the above problems, and is dried under vacuum while maintaining the granular material so that it does not always adhere to the inner wall, and pyrolysis by low temperature vacuum drying, stable high temperature without thermal deterioration, etc. Not only can it be used as a dryer to obtain quality, but it can also be used as a mixer. In the mixing process, additive powder, additive liquid, etc. can be added freely in a sealed state, and uniform mixing is performed. An object of the present invention is to provide a rotary dryer that can be used.

[Means for Solving the Problems] That is, in the rotary dryer according to the present invention, a jacket is spaced around the outer periphery of a can body having an inlet / outlet opening provided with an airtight lid that can be opened and closed on one side, and hot water is provided.・ A double-structured can main body that forms a warm air distribution chamber is horizontally installed via a shaft body protruding from the shaft core and is rotated by a rotary drive motor. A mixing blade, which is rotatably driven by a rotary drive mechanism, is pivotally installed on a part of the inner wall surface of the body, and hot water / hot air supply / drainage pipes communicating with the hot water / hot air distribution chamber are communicated with the outside to connect the main body of the can. One or a plurality of inlet pipes for adding powder or granules or fluid having an inner end opened to the inner cavity, an air supply pipe for feeding high-pressure gas, and an exhaust communication pipe formed by connecting the end portion to an external vacuum device. The air supply pipe is formed so as to penetrate therethrough, and the inner end of the air supply pipe is spaced apart and opposed to the inner wall of the can body and is provided on the outer peripheral side wall. The gist is that an arc-shaped air nozzle having a small number of small holes is formed.

Further, it is desirable that the can body has a conical cross section.

Furthermore, the airtight lid provided at the inlet / outlet of the can body is openable / closable, and has a jacket structure in which the inner wall can be opened / closed as needed, and the jacket portion is connected to the outside via hot water / hot water supply / drainage pipes. The hot water / warm air circulation chamber is formed so as to communicate with each other and heat or supply a fluid through the inner wall.

[Operation] Therefore, when the apparatus of the present invention is used as a dryer or a granulator, the airtight lid is opened and the powdery or granular material to be dried is put into the can through the charging / discharging port, and then the airtight lid is closed. It is dried while being driven by a rotary drive motor using the shaft as a spindle, and at the time of drying, hot water at an appropriate temperature sent from the hot water supply / drainage pipe is supplied to the hot water / warm air circulation chamber and the airtight lid of the can. Introduced into the jacket part of (1), the dried powder and granules are heated and dried through the wall surfaces of the can body and the lid body. Since the inner wall of the can body is decompressed by a vacuum device via an exhaust communication pipe, it is dried in a vacuum and can be dried at a low temperature, and a stable product of high quality without thermal decomposition or thermal deterioration is obtained. To be
Further, the inner wall of the jacket portion of the airtight lid can be opened to the inner cavity of the can body, and air can be supplied through the airtight lid while ventilating and drying.

When used as a mixer, after the powdered or granular material to be mixed is charged into the can through the charging / discharging port, the airtight lid is closed, and the shaft is used as a spindle to rotate the rotary drive motor and simultaneously The mixing blades installed on the inner wall are mixed while being rotationally driven by a rotary drive mechanism such as an air motor.However, since the can body is conical in shape, when it rotates, the contents face the wall surface due to the conical cross-sectional shape. As a result, "pushing" and "diffusion" are repeated, and in combination with the rotational drive of the mixing blade, mixing is promoted. When adding powder or liquid in the mixing process,
The powder or granules or liquid to be added to the inner cavity of the can body is charged or sprayed through the feeding pipe, and after mixing, it is discharged from the charging / discharging port.

[Examples] Examples of the rotary dryer of the present invention will be described below with reference to the drawings.

FIGS. 1 to 6 show a first embodiment of the present invention, in which reference numeral 1 is a can body 2 made of stainless steel or carbon steel, and a jacket 3 is spaced around the outer circumference of a can body 2 to provide hot water / hot air. A can body having a double structure in which a flow chamber 4 is formed, and a conical top of one side of the can body 1 having a conical cross section has an inlet / outlet port 14 provided with an airtight lid 13 that can be opened and closed. It will be done. A flange member 5a for connecting and fixing the rotary pipe shaft 5 to one end of the shaft core of the can body 1.
And the flange member 5a and the extension portion of the rotary tube shaft 5 that is extended in an airtight manner with the flange member 5a are horizontally mounted via bearing devices 6 and 6 fixedly mounted on the base 7, and are rotatably supported. The rotary tube shaft 5 or the extension portion 6 is appropriately rotationally connected to a rotary driving device (not shown), and is rotationally driven by a predetermined rotary program.

Reference numeral 8 is a viewing window provided on one side of the can body 1 and is formed by hermetically sealing a transparent hard glass 10 to a frame body 9 fixed between the can body 2 and the jacket 3. The rotating tube shaft 5
In the powder supply pipe 12, which is rotatably and airtightly inserted through a shaft-sealing mechanism 15 such as a gland packing, and which communicates with the powder supply nozzle 11 through the transmission pipe 16. An exhaust pipe 18 provided with an air filter 17 at an end, a liquid supply pipe 20 provided with a spray nozzle 19 for adding liquid at an inner end, and a signal wire insertion through which a signal cable communicating with a temperature sensor 21 extending to the inner cavity of the can 2 is inserted. An air supply pipe 24 communicating with the pipe 22 and the adhesion preventing air nozzle 23 is airtightly inserted.
The adhesion preventing air nozzle is formed by forming an arc shape with a large number of small holes 25, 25 ... Perforated on the outer peripheral wall so as to face the inner wall of the can body 2 in a spaced-apart relationship. The powder particles attached to the inner wall of the body 2 are scattered.

Further, reference numeral 26 is a rotary joint pipe which is rotatably and airtightly inserted with respect to the rotary tube shaft extension portion, and hot air for supplying jacket or hot water supply / discharge ports 27, 2 are provided.
8, hot air or hot water supply / exhaust ports 29, 30 for supplying the airtight lid, gas supply / exhaust ports 31 and 32 for chopper, and a spare port 33 are provided, and through each communication passage 34 formed in the rotary pipe shaft 5. Each of them is in rotational communication with the hot water / warm air flow chamber 4 of the can and the jacket portion of the airtight lid 13 described later.
The airtight lid 13 has a ring-shaped support frame 35 and a charging / discharging hole 14
The support frame 35 is provided with the above-mentioned input / output holes 1
A rotary shaft 36 that traverses the shaft core of 4 and the support frame 35 is rotatably and airtightly installed, and a partition plate 37 fixed to the rotary shaft 36 is approximately 90 inside the input / discharge hole 14. O which is reversible once and is ring-attached to the outer periphery of the partition plate 37.
It has a valve structure that is hermetically inserted through a ring. A perforated plate 38 having a large number of small holes is detachably provided by a small screw on a concave surface formed on the partition side surface of the partition plate 37, and a jacket portion 39 is formed at each end of the rotary shaft 36. A fluid supply / supply passage 43 and a fluid discharge passage 44 which respectively communicate with the jacket portion 39, and communicate with the hot air or hot water supply / discharge ports 29, 30 for supplying the airtight lid 13 through the communication passage 34. Become. Further, reference numeral 40 is the rotary shaft 3.
6 is a valve opening / closing lever fixed to one end of the valve 6.

Reference numeral 41 is a mixing blade that is airtightly provided axially on a part of the inner wall surface of the can body 2. The mixing blade 41 is rotationally driven by a rotary drive mechanism such as an air motor 42 to add liquid to the powder or granular material. The pelletized mass after granulation is broken into frames, or the granulated product is heated and dried by hot air from the jacket and broken into dry frames.

In the rotary dryer having the above structure, after the powder to be dried or the powder to be mixed is charged into the can 2 from the charging / discharging port 14, the airtight lid 13 is provided.
The can body 1 is rotated or oscillated according to a predetermined program by a rotation drive device to dry or mix. The can body 2 has a conical shape. Depending on the shape, the contents are repeatedly pushed and diffused toward the wall surface, and the hot air or hot water supply / discharge ports 27, 28 for supplying the jacket or the hot air or hot water supply / discharge ports 29, 30 for supplying the airtight lid 13 are supplied with hot water or A hot water / warm air flow chamber 4 and an airtight lid 1 for hot air
3, and at the same time, the additive fluid or powder is supplied to the inner cavity of the can body 2 via the powder supply pipe 12, the exhaust pipe 18, the liquid supply pipe 20 and the air supply pipe 24 at the same time. While drying or mixing is performed.

Next, FIGS. 7 and 8 show a second embodiment of the present invention, and the structure of the portion different from the first embodiment will be described.

A can body 1 having a double structure in which a jacket 3 is spaced around an outer circumference of a can body 2 and a hot water / warm air flow chamber 4 is formed is provided with an airtight lid 13 which can be opened and closed at the bottom of a conical can body 1. In addition to opening the charging / discharging port 14, a mixing blade 41, which is rotationally driven by an air motor 42 or the like, is airtightly provided on a part of the inner wall surface of the can body 2 at the top. A flange member 5a having a rotary tube shaft 5 connected to one end of the shaft core of the can body 1.
Is provided so as to project, and an extension portion of the rotary tube shaft 5 is rotatably supported by a horizontal shaft via a bearing device fixed to a base 7 (not shown). It is driven to rotate by the above rotation program, and an exhaust pipe 18 having an air filter 17 at its inner end is hermetically inserted through the rotary pipe shaft 5.

At the other end of the axis of the can body 1, a mechanical seal mechanism including a bearing 45 and an oil seal 46 is rotatable and airtight with respect to a flange 52 having a material supply port 49 between the can body 2 and the jacket 3. A rotary frame 53 carried by the above is fixedly provided, and a frame body 9 that can be opened and closed airtightly by lock handles 50, 50 is provided for the material supply port 49, and the transparent hard glass 10 is attached to the frame body 9. Is formed in an airtight manner, and a wiper 51 is formed in the observation window.

The flange 52 has a liquid supply pipe 20 having a spray nozzle 19 for adding liquid at its inner end, a signal wire insertion pipe 22 for inserting a signal cable communicating with a temperature sensor 21 extending to the inner cavity of the can body 2, and a pressure gauge 47. And an air supply pipe 24 communicating with the adhesion preventing air nozzle 23 are airtightly inserted, and the adhesion preventing air nozzle 23 includes the can body 2.
Of the small holes 25, 25 facing the inner wall of the
.. are formed to form an arc shape, and the air pressure ejected from each of the small holes 25 blows off and removes the powder particles attached to the inner wall of the can body 2.

That is, the rotary dryer having the above-described structure can supply materials and additives from the material supply port 49 and the liquid addition spray nozzle 19 to perform drying, granulation and coating of powder and granular material. The air blown from the adhesion preventing air nozzle 23 facing the inner wall away from the inner wall blows away the powder particles that have adhered to the inner wall of the can body 2.
And it can be controlled automatically by the information output from the pressure gauge 47.

[Advantages of the Invention] As described above, the rotary dryer according to the present invention is provided with an additive feed pipe for powder and granular material addition of a double cone rotary dryer and a valve operating fluid for the feed pipe. The device can be used as a dryer or a mixer by inserting the inlet pipe into the inner cavity of the can body through the exhaust communication pipe. In addition, the operation of adding other powder or granules or liquid to be added in the mixing process is extremely simple, and there is no adhesion of powder or granules to the inner wall of the can during mixing or drying. In addition, the can is opened during the addition. Therefore, it has features such as excellent quality control. Further, the rotary dryer of the present invention not only has a mixing function of simply mixing a plurality of powders and liquids, but can also be added and mixed in the drying process, so that the main purpose of granulation, liquid addition, coating, etc. Since it can also be used as a device, it has extremely excellent characteristics such as exhibiting a multipurpose function, and the practical effect after the present invention is carried out is extremely large.

[Brief description of drawings]

FIG. 1 is a front view showing an entire apparatus showing a first embodiment of a rotary dryer according to the present invention, FIG. 2 is a side sectional view of a can body, and FIG. 3 is an enlarged line AA in FIG. Sectional drawing, FIG. 4 is a sectional view taken along the line BB in FIG. 1, FIG. 5 is a sectional view taken along the line CC in FIG. 1, FIG. 6 is an enlarged sectional view of the airtight lid, and FIG. FIG. 8 is a side sectional view of the can body showing the embodiment of FIG. 1 ... can body, 2 ... can body, 3 ... jacket, 4 ...
Hot water / hot air distribution chamber, 5 ... Rotating tube shaft, 6 ... Bearing device,
11 ... Powder supply nozzle, 12 ... Powder supply pipe, 13 ...
… Airtight lid, 14 …… Inlet / outlet, 15 …… Shaft sealing mechanism,
16 ... Transmission pipe, 17 ... Air filter, 18 ... Exhaust pipe, 19 ... Liquid addition spray nozzle, 20 ... Liquid supply pipe, 21 ... Temperature sensor, 22 ... Signal line insertion pipe, 2
4 ... Air supply pipe, 23 ... Adhesion prevention air nozzle, 26 ...
… Rotary joint pipe, 37 …… Partition plate, 39
...... Jacket part, 41 …… Mixing blade, 42 …… Air motor.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masayoshi Aoki 2-chome, Higashi-Nakahara, Hiratsuka-shi, Kanagawa 2-46 East Village No. 202 (72) Inventor Tomio Suzuki 581 Manazuru, Manazuru-cho, Ashigarashimo-gun, Kanagawa (72) Inventor, Horii Makoto 3-36 Taura-cho, Yokosuka City, Kanagawa Prefecture (56) References Japanese Patent Laid-Open No. 61-332225 (JP, A) Actually developed 56-12786 (JP, U)

Claims (6)

[Claims] 1. A double structure having a hot water / warm air circulation chamber formed by surrounding a jacket on the outer periphery of a can body having an opening / closing port provided with an airtight lid which can be opened and closed on one side. The can body has a structure in which the can body is horizontally mounted via a shaft body protruding from the shaft core and rotated by a rotation drive motor, and the can body is rotated by a rotation drive mechanism on a part of the inner wall surface of the can body. A powder or granular material having a driving mixing blade pivotally connected, and a hot water / warm air supply / drainage pipe communicating with the hot water / warm air circulation chamber communicating with the outside to open the inner end in the inner cavity of the can body. A single or a plurality of feed pipes for adding a gas, a feed pipe for feeding a high-pressure gas, and an exhaust communication pipe formed by connecting an end portion with an external vacuum device through the shaft body, and an inner end of the feed pipe. An arc-shaped air nozzle having a large number of small holes formed in the outer peripheral side wall and facing the inner wall of the can. Rotary dryer according to claim. 2. An airtight lid provided at the inlet / outlet of the can body so as to be openable / closable has a jacket structure in which the inner wall can be opened / closed as needed, and the jacket portion is provided with hot water / hot air supply / drainage pipes. The rotary dryer according to claim 1, wherein the rotary dryer communicates with the outside to form a hot water / warm air circulation chamber. 3. The rotary dryer according to claim 1, wherein the can body has a conical cross section. 4. The rotary dryer according to any one of claims 1 to 3, wherein the main body of the can is horizontally installed via a shaft body protruding from one end of the shaft core. 5. The rotary dryer according to any one of claims 1 to 3, wherein the can main body is laterally installed axially via shaft bodies protruding from both ends of the shaft core. 6. The rotary dryer according to claim 1, wherein the hot water / warm air supply / drainage pipe is communicated with the outside through a rotary joint provided on the shaft body.