JPH06336217A - Deaeration of powder and deareator - Google Patents

Abstract

PURPOSE:To provide an effective deaerating method of air contained in powder and an improved deaerator for powder which increases the treatment efficiency and miniatulizes the dimensions. CONSTITUTION:Gas contained in powder is deaerated with a decompressing process while flowing down the powder. The deaerator is provided with a feed opening 1A and a discharge opening 1B at the upper and under sides and also a cylindrical body 1 with the almost horizontal axis, a cylindrical body 2 rotatably inserted into the body 1 and provided with a porous member at the peripheral face 20, and rotary blades 3 for discharging the powder at the outer peripheral side of the cylindrical body 2 which can be decompressed in the inside.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a degassing method and a degassing apparatus for powder, and more particularly, a method for efficiently degassing gas contained in the powder and a method for degassing the powder. The present invention relates to an apparatus for degassing a gas to be subjected to a volume reduction process, and to a degassing apparatus for powder, which is improved so as to be downsized by increasing processing efficiency.

[0002]

2. Description of the Related Art Generally, when handling powder, a degassing device is used to degas the gas contained in the powder to reduce its volume. Such processing is performed for the purpose of rationalizing processing such as transportation and processing in various processing steps or improving the working environment.

Conventionally, as a deaerator for powder, for example,
The device described in Japanese Patent Application Laid-Open No. 64-43409 is known. Such a deaeration device has a structure in which a part of a trough is formed of a filtering material in a screw conveyor, and the outer peripheral side of the filtering material is sucked to deaerate during powder transfer.

[0004]

By the way, in the above-mentioned conventional apparatus, since the powder in the trough is transferred substantially horizontally by the pressing force of the screw conveyor, there is a problem that the apparatus becomes larger than the throughput. is there. Further, since friction occurs due to the rotation of the screw, the powder may adhere to the screw depending on the type and supply amount of the powder, further lowering the processing efficiency and adversely affecting the physical properties of the powder.

The present invention has been made in view of the above circumstances. An object of the present invention is to efficiently degas the gas contained in the powder, and to degas the gas contained in the powder. It is an object of the present invention to provide a powder degassing apparatus which is an apparatus for performing volume reduction processing and which is improved so as to be downsized by increasing processing efficiency.

[0006]

That is, the first aspect of the present invention
The gist of (1) lies in a degassing method for powder, characterized in that depressurizing treatment is carried out while the powder is flowing down to degas the gas contained in the powder. Further, a second gist of the present invention is a powder degassing device for degassing gas contained in powder to perform volume reduction processing, wherein a supply port and a discharge port are provided above and below, respectively. A cylindrical main body whose axis is arranged substantially horizontally, a cylindrical body whose peripheral surface is formed of a porous member and is rotatably inserted in the main body, and rotatably arranged on the outer peripheral side of the cylindrical body. And a blade member for transferring powder, and the inside of the cylindrical body is configured to be capable of depressurizing.

[0007]

The degassing method of the present invention is achieved by the degassing device of the present invention. According to the deaerator of the present invention, the powder supplied from the upper supply port flows down onto the peripheral surface of the cylindrical body rotatably inserted in the main body and is transferred to the lower discharge port. . At that time, the cylindrical body whose peripheral surface is formed of a porous member,
It is configured to be able to depressurize the inside and degas the gas in the powder. Further, the blade member for powder transfer, which is rotatably arranged on the outer peripheral side of the cylindrical body, agitates the powder while scraping it from the peripheral surface of the cylindrical body, so that the powder does not adhere to the cylindrical body. Moreover, the degassing action of the cylindrical body is further enhanced.

[0008]

EXAMPLES The powder degassing method of the present invention is carried out by the powder degassing apparatus of the present invention shown in the following structural examples. Hereinafter, a powder deaerator according to the present invention will be described with reference to the drawings. FIG. 1 is a side sectional view showing the outline and operating method of a deaerator according to the present invention. FIG. 2 is a view showing the details of the deaerator according to the present invention, II- in FIG.
II is a cutaway view. FIG. 3 is a partial cross-sectional view showing a configuration example of a peripheral surface of a cylindrical body of a deaerator according to the present invention and a deaerating process from powder.

The degassing apparatus for powder of the present invention (hereinafter abbreviated as degassing apparatus) is an apparatus for degassing the gas contained in the powder to reduce the volume, and is shown in FIG. Like this, a cylindrical main body (1) provided with a supply port (1A) and a discharge port (1B) above and below and whose axes are arranged substantially horizontally.
And a cylindrical body (2) having a peripheral surface (20) formed of a porous member and rotatably inserted in the main body (1), and a powder rotatably arranged on the outer peripheral side of the cylindrical body (2). It is provided with a blade member (3) for transferring a body. Then, the inside of the cylindrical body (2) can be decompressed.

The main body (1) has a substantially cylindrical inside. Further, the supply port (1A) and the discharge port (1B) are openings in the main body (1), and are usually provided over substantially the axial length of the main body. As shown in FIG. 2, a cover ring (11a) and an annular side cover (12a) having an inner diameter smaller than that of the cover ring are coaxially arranged on one end surface side of the main body (1) sequentially from the main body side. It is annexed. And these coverings (11
a) and the side cover (12a) support one end side of the blade member (3).

A cylindrical box (15) is coaxially projected on the side cover (12a), and the end of the box (15) has an intake chamber (6) inside the box.
Therefore, it is sealed by the end plate (14). A bearing (13) is arranged at the center of the end plate (14).

On the other end surface side of the main body (1), a cover ring (11b) and a substantially cylindrical side cover (12b) having an inner diameter smaller than that of the cover ring are coaxially provided in order from the main body side. There is. The cover ring (11b) and the side cover (12b) support the other end of the blade member (3).

The cylindrical body (2) in FIG. 1 transfers the powder from the supply port (1A) to the discharge port (1B), and during the transfer, gas such as air (hereinafter referred to as gas) contained in the powder. , Simply referred to as gas). Cylindrical body (2)
2 has both end faces sealed with disk-shaped flanges (24a) and (24b), as shown in FIG.
It is attached to a main shaft (5) inserted through the axis of the cylindrical body. In addition, a hole (24c) for sucking gas inside the cylindrical body (2) is opened on the end surface of the flange (24a).

One end of the main shaft (5) is supported by a bearing (13) provided on the end plate (14), and the other end side is on the other end side of a blade member (3) described later. It is supported by bearings (33) arranged. A sprocket (54) is provided on the other end side of the main shaft (5). A chain that transmits the rotation of a drive motor (not shown) is wound around the sprocket (54).

The peripheral surface (20) of the cylindrical body (2) usually has a laminated structure of various porous members in order to maintain its strength. As the structure of such a peripheral surface (20), for example, as shown in FIG. 3, a perforated plate (24), a wire mesh (25), a filter medium (28), a wire mesh (27), a perforated plate (2).
A structure in which 6) is sequentially laminated from the outer peripheral side is used.

The perforated plates (24) and (26) are attached to the peripheral surface (2
0) structure and is provided to protect the filter medium (28). A large number of holes (24c) for appropriately holding the powder are opened in the perforated plate (24). Further, the perforated plate (26) has holes (26c) for sucking air and the like in the powder.
There are many openings. Since the number of such holes (26c) increases the effective area of filtration in the filter medium (28),
Usually, the number is smaller than the number of holes (24c) of the perforated plate (24).

As the filter material (28), those having various structures can be used. From the viewpoint of filtration accuracy and manufacturing accuracy, for example, a sintered type filter material obtained by molding and sintering metal or non-metal fiber or ceramic powder. Is used. In addition, wire mesh (2
5) and (27) are protective layers that reinforce the filter medium (28) and prevent clogging of its surface.

The blade member (3) scrapes off the powder adsorbed on the peripheral surface (20) of the cylindrical body (2) in the deaeration operation,
Then, it has a function of reliably and quantitatively transferring the powder from the supply port (1A) to the discharge port (1B). As shown in FIG. 2, the blade member (3) is configured by arranging a plurality of strip-shaped flat plates (30) in parallel with the main shaft (5). The arrangement of such flat plates (30) is such that the short edges of each flat plate (30) are radially positioned with respect to the main axis (5), as shown in FIG. And each flat plate (30)
Both ends of the fixing ring (31
It is locked at (a) and (31b). That is, the entire shape of the blade member (3) is a runner shape of a water turbine. The number of the flat plates (30) is preferably four or more.

The above-mentioned fixing rings (31a), (31)
In b), a seal member is inserted on the inner peripheral side thereof, and the flanges (24a) and (24b) of the cylindrical body (2) are airtightly and slidably mounted on the outer peripheral surfaces thereof. The blade member (3) is rotatably held with a minute gap held between the inner peripheral long edge of each flat plate (30) and the peripheral surface (20) of the cylindrical body (2). There is. The gap between the blade member (3) and the cylindrical body (2) is usually about 1 mm.

Further, each fixing ring (31a), (31
b) is the cover rings (11a), (11) of the main body (1).
In contrast to b), a sealing member is inserted inside the cover ring in an airtight and slidable manner. A blade rotation shaft (32) formed in a tubular shape is coaxially attached to the stationary ring (31b) to rotate the blade member (3) independently of the main shaft (5).

As shown in FIG. 2, a sprocket (34) is provided at the end of the blade rotating shaft (32) protruding from the main body (1), and the sprocket (3) is provided.
The bearing (33) for supporting the other end side of the main shaft (5) is coaxially attached to 4). A chain that transmits the rotation of the drive motor (not shown) is wound around the sprocket (34).

That is, the main shaft (5) is inserted into the blade rotating shaft (32), and the blade rotating shaft (32).
Is inserted in the side cover (12b) of the main body (1). A bush is inserted between the main shaft (5) and the inner peripheral side of the blade rotating shaft (32), and between the blade rotating shaft (32) and the inner peripheral side of the side cover (12b). Has been done.

The mechanism for reducing the pressure inside the cylindrical body (2) is
A vacuum line (not shown) including a pressure reducing means such as a vacuum pump is usually connected to the intake chamber (6) provided in the main body (1). In FIG. 2, an opening to which the above vacuum line is connected is provided on the peripheral wall of the box (15) forming the intake chamber (6).

By the way, the deaeration process by the cylindrical body (2) is performed by rotating the cylindrical body (2) from the supply port (1A) at a position corresponding to the left half circumference of the cylindrical body (2) shown in FIG. This is performed in the moving path of the powder that reaches the discharge port (1B) along the direction. Therefore, from the viewpoint of reducing the load on the device, it is preferable to perform the deaeration operation on the peripheral surface (20) of the cylindrical body (2) corresponding to the moving path. Further, in the deaeration operation, the powder is adsorbed on the peripheral surface (20) of the cylindrical body (2), so it is desirable to release the adsorbed state when discharging the powder.

Therefore, as a preferred embodiment of the present invention, since the deaeration operation is performed on the peripheral surface (20) of the cylindrical body (2) corresponding to the above moving path, the inside of the cylindrical body (2) has an axis line. A decompression chamber (23) that is divided into multiple parts in the center
In addition, each decompression chamber (23) can be decompressed at a position corresponding to the movement path of the powder from the supply port (1A) to the discharge port (1B) along the rotation direction of the cylindrical body (2). Composed.

Specifically, as shown in FIG. 1, the decompression chamber (23) includes a plurality of partition plates (21) provided between the inner peripheral surface of the cylindrical body (2) and the main shaft (5). ) Is formed by. As shown in FIG. 2, such a partition plate (21) is a strip-shaped flat plate, and its long edge portion is arranged along the main axis (5). Then, the decompression chamber (2
3) is usually 3 to 12 chambers.

On the other hand, as shown in FIG. 1, the above-mentioned hole (24) of the flange (24a) at one end of the cylindrical body (2).
c) is opened at a position corresponding to each decompression chamber (23), and the outer end face of the flange (24a) is sealed by a substantially annular seal plate (22). The seal plate (22) slidably abuts against the end surface of the rotating flange (24a), and maintains airtightness at the contact surface portion with the flange (24a). It is formed by a sliding contact member such as.

Further, an arc-shaped elongated hole (22c) concentric with the seal plate and extending over substantially half the circumference of the seal plate is opened on the board surface of the seal plate (22). The opening position of the elongated hole (22c) is, as shown in FIG. 1, in the movement path of the powder from the supply port (1A) to the discharge port (1B) along the rotation direction of the cylindrical body (2). This is the corresponding position. The elongated hole (22c) is adapted to be superposed on the hole (24c) for about half the circumference of the flange (24a) by the rotation of the cylindrical body (2).

Further, on the intake chamber (6) side of the seal plate (22), a seal box (4) fitted on the seal plate is provided. Seal Box (4)
Is a substantially donut-shaped annular body, and a recess is formed along the circumference on one end surface thereof. The recess is sealed by the seal plate (22) so that the recess serves as a hollow chamber (4b). A hole (4c) is opened in the other end surface of the seal box (4).

That is, each decompression chamber (23) formed inside the cylindrical body (2) is located at a position where the decompression chamber (23) overlaps the oblong hole (22c) of the seal plate (22) during rotation of the cylindrical body. It is configured to be electrically connected to the hollow chamber (4b) of (4). The hollow chamber (4b) always communicates with the intake chamber (6) through the hole (4c). Therefore, when decompressing the intake chamber (6) through the above vacuum line, only the decompression chamber (23) at a specific position can be decompressed.

Further, on the outer peripheral side of the seal box (4), since the seal box is fixed to the main body (1) side,
The adjustment bolt (41) is inserted, and the adjustment bolt (41) is screwed to the side cover (12a). The adjustment bolt (41) also includes a seal plate (2) for the flange (24a).
In order to adjust the contact pressure of 2), an elastic member that constantly urges the seal plate is interposed.

Next, the processing method in the deaerator of the present invention will be described. In the deaerator, powder containing gas and having a low bulk density is supplied from the supply port (1A). As shown in FIG. 1, the supplied powder is made to flow down onto the peripheral surface (20) of the cylindrical body (2) inserted in the main body (1). In addition, the cylindrical body (2) is rotated by the rotation of the main shaft (5) so that
Inside, it rotates counterclockwise and gradually transfers the powder on the peripheral surface (20) downward.

The inside of the cylindrical body (2) has a decompression chamber (2
3) is individually decompressible, and each decompression chamber (2
3) is a hollow at a position overlapping the elongated hole (22c) of the seal plate (22), that is, between the supply port (1A) and the discharge port (1B) along the rotation direction of the cylindrical body (2). The pressure is reduced via the chamber (4b) and the intake chamber (6).

When each decompression chamber (23) is decompressed at a specific position, as shown in FIG. 3, the gas outside the cylindrical body (2) has a perforated plate (24) forming a peripheral surface (20). ) Is sucked through the hole (24c). Then, the sucked gas is introduced to the decompression chamber (23) side through the wire mesh (25), the filter medium (28), the wire mesh (27) and further through the holes (26c) of the perforated plate (26).

At this time, the powder on the peripheral surface (20) is sucked toward the decompression chamber (23), and a part of the powder is held in the holes (24c) of the perforated plate (24). However,
The powder in the holes (24c) is the wire mesh (25) and the filter medium (2
8) captured and only gas is passed through the filter media (28), wire mesh (27) and holes (26c). Therefore, the degassing apparatus of the present invention can separate the powder and degas only the gas contained therein to reduce the volume of the powder on the peripheral surface (20).

In the above separating operation, the powder held by the holes (24c) of the perforated plate (24) forms a fixed layer, and the fixed layer mainly separates the gas in the powder. The separation accuracy can be improved, and the life of the filter medium (28) can be extended.

On the other hand, as shown in FIG. 1, the blade member (3) arranged on the outer peripheral side of the cylindrical body (2) is rotated in the same direction as the cylindrical body (2) by the rotation of the blade rotating shaft (32). And the powder on the peripheral surface (20) is reliably transferred downward. In this case, the peripheral speed of the blade member (3) is usually different from the peripheral speed of the cylindrical body (2). Preferably, the peripheral speed of the blade member (3) is made higher than that of the cylindrical body (2).

That is, when the peripheral speed of the blade member (3) is made higher than that of the cylindrical body (2), the blade member (3) stirs the powder while scraping it from the peripheral surface (20). It is possible to efficiently deaerate the entire powder.
At the same time, the blade member (3) prevents the powder fixing layer from being formed on the peripheral surface (20), so that the suction force in the cylindrical body (2) can be sufficiently exerted. Therefore, the deaerator of the present invention can efficiently deaerate the gas contained in the powder.

As shown in FIG. 1, the degassed powder is surely transferred downward by the blade member (3) which rotates together with the cylindrical body (2). Outlet (1
In B), in each decompression chamber (23), the hole (24c) of the flange (24a) corresponding to the decompression chamber deviates from the position of the long hole (22c) of the seal plate (22) and is cut off from the vacuum line. . As a result, in the deaerator of the present invention, the powder adsorbed on the peripheral surface (20) of the cylindrical body (2) can be easily desorbed, and the degassed powder has a bulk density. Is discharged from the discharge port (1B) as a large powder.

In the above processing, in the deaerator of the present invention, the blade member (3) reliably moves the powder regardless of the variation of the powder type and the supply amount, so that the inner wall of the main body (1). Blocking in the movement path between the cylinder and the cylindrical body (2) is prevented, and smooth processing can be performed. Particularly, the blade member (3) can reliably transfer powder having high adhesiveness.

Moreover, in the deaerator of the present invention, when the peripheral speed of the blade member (3) is made higher than the peripheral speed of the cylindrical body (2), the blade member (3) is constantly agitated to make it uniform. Since the volume reduction process can be performed, the discharged powder does not become agglomerate and a quantitative process can be performed. Then, at the discharge port (1B), the powder can be scraped off and reliably dropped.

As described above, the deaerator of the present invention deaerates powder while moving it from the upper side to the lower side by means of the rotatable cylindrical body (2), and moreover, ensures the use of the blade member (3). Since the powder is transferred, it can be efficiently processed regardless of the type of powder, and as a result, the apparatus can be downsized. Further, in the deaerator of the present invention, since the external pressure applied to the powder is small, heat generation can be reduced and the physical properties of the powder are not affected. Further, since the powder transferring means in the device has a simple structure, the device cost can be reduced with respect to the processing efficiency.

The deaerating method and deaerating apparatus of the present invention can be applied to various powders such as carbon black, toner and pigment. By reducing the volume of the powder, it is used for packing the powder, rationalizing the handling in transportation, suppressing dust, etc., as well as loading the powder in processing equipment such as granulators and compressors. It is used for various purposes such as increasing the bulk density as a pretreatment before supplying, shortening the kneading time with the binder and the granulating time. Further, the present invention can be suitably used not only for powders but also for various particulates that can be reduced in volume in a deposited state.

[0044]

As described above, according to the powder degassing method of the present invention, the degassing treatment can be efficiently performed,
Further, according to the powder degassing apparatus of the present invention, it is possible to efficiently degas and perform volume reduction processing regardless of the type of powder, and it is possible to reduce the size of the apparatus.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an outline and an operating method of a deaerator according to the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG. 1 for showing details of the deaerator according to the present invention.

FIG. 3 is a partial cross-sectional view showing a configuration example of a peripheral surface of a cylindrical body of a deaerator according to the present invention and a deaerating process from powder.

[Explanation of symbols]

 1: Main body 1A: Supply port 1B: Discharge port 2: Cylindrical body 20: Peripheral surface 21: Partition plate 22: Seal plate 22c: Hole 23: Decompression chamber 24c: Hole 3: Blade member 30: Flat plate

Claims (2)

[Claims] 1. A degassing method for a powder, which comprises depressurizing a gas contained in the powder by performing a depressurization treatment while the powder is flowing down. 2. A powder degassing apparatus for degassing gas contained in powder to perform volume reduction processing, wherein a supply port and a discharge port are provided above and below and an axis is arranged substantially horizontally. A cylindrical main body, a cylindrical body whose peripheral surface is formed of a porous member and is rotatably inserted in the main body, and a powder transfer unit rotatably arranged on the outer peripheral side of the cylindrical body. A deaerator for powder, comprising a blade member, and the inside of the cylindrical body is configured to be capable of depressurizing.