JPH04242501A - Deaerator of powder - Google Patents

Abstract

PURPOSE:To remarkably increase a deaeration effect of powder, by providing a screw conveyor for transferring powder in a guide cylinder and further, providing a vacuum suction device at the outer periphery of the guide cylinder. CONSTITUTION:In a deacration device of powder provided with a guide cylinder 1, a screw conveyer 2 for trsnsferring powder, and an air-suction device 3 for sucking to remove the air within the guide cylinder 1, a powder stuffing chamber 14 is provided between the terminal position of a screw blade 22 and the powder outlet position 12 in the guide cylinder 1. And a closing member 4 to be able to shutt the powder outlet 12 is fitted to be movable back and forth at the outer periphery of the screw shaft 21 of the screw conveyor 2 and further, an actuator 5 is provided at the rear face of the closing member 4 to forcibly direct the closing member 4 to the shutting direction. Since the closing member 4 is forced to shutt the powder outlet, the powder Y can be compressed between the closing member 4 and the screw blade terminal 22a in the powder stuffing chamber 14 and hence, the deaeration effect can be remarkably increased.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a powder degassing device for eliminating air from powder to make the powder denser.

0002

[Prior Art] A large amount of air is mixed between each powder particle during the manufacturing stage of the powder, and if the powder is packed into bags without removing the air, the filling efficiency will deteriorate. .

[0003] Conventionally, as a powder deaeration device for removing air from powder, a device as shown in FIG. 4 is generally known. The powder deaerator shown in FIG. 4 includes a screw conveyor 102 in a guide tube 101 having a porous cylindrical portion 113, and further includes a vacuum suction type suction device 103 on the outer periphery of the porous cylindrical portion 113.

[0004] In this powder deaerator, the guide cylinder 1
When powder Y is introduced from the powder inlet 111 at one end of the 01, the powder Y is sequentially transferred inside the guide tube 101 toward the powder outlet 112 by the screw conveyor 102, and While the powder Y is passing through the guide tube 101, the air between the powder particles is sucked by the suction device 103, and the deaerated powder Y is sequentially passed from the powder outlet 112 of the guide tube 101 to the discharge port 116. through which it is discharged to the outside.

By the way, when the powder Y is transferred inside the guide tube 101 to the powder outlet 112 side, the air in the powder Y is sequentially discharged to the outside by the suction device 103, and the air inside the guide tube 101 is The density of the powder Y increases as it moves toward the powder outlet 112, as shown by the chain line Y', and a large space S is formed in the upper part of the guide cylinder 101.

[0006]

However, in the known powder deaerator shown in FIG. The density gradually increases as it is vacuum-suctioned by
Since the space S generated in the upper part of the guide tube 101 near the powder outlet 112 communicates with the discharge port 116, even if the suction device 103 performs vacuum suction, the discharge port 11 does not remain in the guide tube 101.
A large amount of air flows in from the 6 side, and the air suction effect in the powder Y inside the guide tube 101 is extremely attenuated. In this way, in the part of the guide cylinder 101 filled with powder Y, there is no air inflow from the outside, so the degassing effect in the powder is relatively high. In the part where S is generated, the degassing effect on the powder is extremely reduced, and as a result, the air in the powder discharged from the powder outlet 112 to the discharge port 116 side can only be removed to a certain extent. There was a problem.

In view of the problems of the conventional powder deaerator described above, the present invention aims to provide a powder deaerator that can significantly improve the efficiency of deaeration of air in powder. It was done for a purpose.

[0008]

[Means for Solving the Problems] The present invention provides a guide cylinder having a powder inlet at one end, a powder outlet at the other end, and a permeable porous cylinder. In a powder deaerator comprising a screw conveyor for transferring powder provided with screw blades and further equipped with a vacuum suction type suction device on the outer periphery of the porous cylindrical part, the terminal end of the screw blade provided on the screw shaft by a predetermined length from the powder outlet position of the guide cylinder to a position closer to the powder inlet side, and a powder filling chamber is formed between the screw blade terminal position and the powder outlet position in the guide cylinder. At the same time, an annular blocking member having an outer diameter capable of blocking the powder outlet is provided on the outer periphery of the screw shaft, and is moved back and forth between a closed position where the powder outlet is blocked and an open position where the powder outlet is opened. When the shielding member is fitted freely, and further, the shielding member is urged toward the powder outlet closing position side, and a pressing force of a predetermined pressure or more is applied to the front surface of the shielding member. The present invention is characterized in that a biasing means having a resilient force capable of retracting the closing member toward the powder outlet opening position by its pressing force is provided.

[0009]

[Operation] In the powder deaerator of the present invention, when powder to be deaerated is continuously inputted from the powder inlet of the guide cylinder, the powder is sequentially moved inside the guide cylinder to the powder outlet side by a screw conveyor. At this time, the air in the powder is sucked and removed by the suction device. On the other hand, at the powder outlet position of the guide cylinder, a blocking member capable of closing the powder outlet is installed on the outer periphery of the screw shaft of the screw conveyor, and is urged in a direction to close the powder outlet by a biasing means. The powder, which is sequentially transferred to the powder outlet side by the screw blades, is once blocked by the shielding member and stored in the powder filling chamber between the front surface of the shielding member and the end of the screw blade. . After that, the powder filling chamber is successively pushed with subsequent powder by the screw conveyor, and the powder filling chamber is filled with powder, and the powder filling chamber is filled with the powder by the subsequent powder supply action by the screw blades. powder becomes compressed. In this state, the powder outlet is completely blocked by the blocking member and the powder filling the powder filling chamber, and air no longer flows into the guide cylinder from the powder outlet side. The deaeration effect in the powder inside the guide cylinder is further promoted. When the pushing force against the powder in the powder filling chamber becomes larger than the urging force of the urging means against the blocking member due to the powder supplying action of the screw blade, the blocking member resists the urging means due to the pressing force. The powder outlet is moved back to the powder outlet open position side, and the powder outlet is opened, and the powder filled in the powder filling chamber is sequentially moved to the powder outlet in the amount of powder newly supplied into the powder filling chamber. It begins to be emitted from Note that when the amount of powder supplied into the powder filling chamber by the screw blade decreases, the pressing force of the powder filled in the powder filling chamber against the closing member becomes weaker, and in that case, the urging force of the urging means The blocking member automatically moves in the direction of closing the powder outlet.

0010

Therefore, according to the powder degassing device of the present invention, the powder is removed from the shielding chamber energized by the energizing means in the powder filling chamber provided in the vicinity of the powder outlet in the guide cylinder. Since the powder is compressed by the member and the subsequent powder supplied by the screw blade, the air in the powder in the powder filling chamber is forcibly removed.
The powder can be made highly dense in the powder filling chamber.

[0011] When the powder in the powder filling chamber reaches a predetermined high density or higher, the powder pressing action by the screw blade causes the blocking member to retreat against the biasing means to open the powder outlet. This allows the densely packed powder to remain as it is (remains highly dense) in the powder filling chamber.
The powder is automatically discharged from the powder outlet in sequence, and the powder can be degassed automatically and continuously.

Furthermore, since the powder filling chamber is always filled with powder in a high density state, the powder prevents air from flowing into the guide cylinder from the powder outlet side, and the air is removed by the intake device. This has the effect of further improving energy efficiency.

[0013]

[Embodiment] An embodiment of the present invention will be described with reference to FIGS. 1 to 3. The powder deaerator of this embodiment has a powder inlet 11 at one end and a powder outlet 12 at the other end. a horizontal guide cylinder 1 having a perforated cylindrical part 13 in the middle part;
A screw conveyor 2 for transferring powder provided in the guide tube 1, a vacuum suction type suction device 3 located on the outer periphery of the porous cylindrical portion 13 for sucking air inside the guide tube 1, and as will be described later. A shielding member 4 fitted to the outer periphery of the screw shaft 21 of the screw conveyor 2 so as to be movable forward and backward, and the shielding member 4
and a biasing means 5 for biasing the powder outlet in the direction of closing the powder outlet.

The powder inlet 11 of the guide tube 1 opens upward, and the powder outlet 12 opens laterally. A discharge port 16 that opens downward is connected to the powder outlet 12 . Note that an inspection port 18 with a lid 17 is provided directly above the discharge port 16.

The porous cylindrical portion 13 of the guide tube 1 is formed of a wall having a large number of micropores, and is designed to prevent the passage of powder particles but allow the passage of air.

[0016] The screw conveyor 2 has a screw shaft 2
1 and is formed by providing a spiral screw blade 22 around it. The screw conveyor 2 is assembled in a horizontal position at the center of the guide tube 1, with both ends of the screw shaft 21 supported by bearings. Further, this screw conveyor 2 is rotated by a motor 20.

[0017] Screw blades 2 of screw conveyor 2
The terminal end 22a of 2 is kept at a position Q that is a predetermined length L (for example, L=250 mm) from the position P of the powder outlet 12 toward the powder inlet 11 side. The length range between the screw blade end position Q and the powder outlet position P is defined as the powder filling chamber 14.

A portion of the screw shaft 21 beyond the screw blade terminal end 22a (on the side opposite to the powder inlet) is a screw blade-free portion 21a that remains as the shaft.

The intake device 3 is provided with an outer cylinder 32 on the outside of the porous cylindrical portion 13 with an annular sealed space 31 in between, and further includes an intake pipe 33 in the outer cylinder 32 for sucking the air inside the sealed space 31. At the same time, a vacuum pump 34 is connected to the intake pipe 33. And, this intake device 3 is
When the vacuum pump 34 is operated, the inside of the sealed space 31 becomes negative pressure, thereby drawing the air inside the guide cylinder 1 into the porous cylindrical part 13.
It is possible to draw suction into the closed space 31 through the wall of the .

In this embodiment, the shielding member 4 has a slightly smaller diameter than the opening diameter of the powder outlet 12 (for example, the outer diameter of the shielding member 4 is 290 mm while the opening diameter of the powder outlet 12 is 307 mm).
) is formed of an annular body with an outer diameter of Further, the inner diameter of this shielding member 4 is approximately slightly larger than the outer diameter of the screw shaft 21. This shielding member 4
is the screw blade terminal end 22 on the screw shaft 21
It is fitted on the outer periphery of the tip side of a (screw blade non-forming portion 21a) so as to be movable forward and backward in the axial length direction. Note that the front side of the shielding member 4 has a convex tapered surface.

The biasing means 5 for biasing the shielding member 4 includes an annular fixing plate 51 which is located on the rear side of the shielding member 4 and is fixed to the outer periphery of the screw shaft 21, and the fixing plate 5.
1 (reference numeral 57).
, a total of four adjustment bolts 55, 55 fixed to the rear surface of the shielding member 4 at 90° intervals, and interposed between the rear surface of the shielding member 4 and the front surface of the guide plate 53. It is configured with a total of four coil springs 58, 58, .

The fixing plate 51 is fixed to the screw shaft 21 with bolts 52, and by loosening the bolts 52, the position of the fixing plate 51 can be adjusted in the longitudinal direction of the screw shaft 21.

The guide plate 53 is the fixed plate 51
On the other hand, by adjusting the degree of screwing of the screwing portion 57, the position of the screw shaft 21 can be adjusted in the length direction. In addition, this guide plate 53 has adjustment bolts 5 at four locations (angle interval of 90 degrees) near its outer circumference.
A hole 54 for inserting the 5 is formed.

Each of the adjustment bolts 55, 55, . It is inserted into each hole 54 of. A nut 56 is screwed into each end threaded portion 55a of the adjustment bolt 55 from the rear side of the guide plate 53.

The coil springs 58, 58, . . . are supported by adjustment bolts 55, 55, . . . between the rear surface of the blocking member 4 and the front surface of the guide plate 53, respectively. By adjusting the degree of threading of the nut 56 threaded onto the threaded end portion 55a of each adjustment bolt 55, 55, etc., the elastic force of the coil spring 58 and the gap between the guide plate 53 and the blocking member 4 are adjusted. The maximum separation width can be adjusted.

The biasing means 5 blocks the fixed plate 51 or the guide plate 53 from the screw shaft 21 when the coil spring 58 is at its maximum extension (the nut 56 is in abutment against the rear surface of the guide plate 53). Closing member 4
is positioned at the powder outlet closing position as shown in FIG. In the state shown in FIG. 2, the shielding member 4 is in a position to close the powder outlet 12 of the guide tube 1, and the outer peripheral surface of the shielding member 4 and the inner peripheral surface (or mouth edge) of the powder outlet 12 are in contact with each other. In between,
Only a very small gap is created.

This powder deaerator works as follows. That is, with the screw conveyor 2 being rotated by the motor 20 and the suction device 3 being operated, the powder inlet 1 is
When the powder Y to be treated is continuously supplied from 1 to 1, the powder is sequentially sent backward by the screw blades 22, and the air inside the guide tube 1 is sucked through the wall of the porous cylindrical portion 13 by the suction device 3.・Excluded. At the beginning of operation, although the powder inlet 11 side in the guide cylinder 1 is blocked by the supplied powder Y, the powder outlet 12
Since there is a gap between the outer circumferential surface of the shielding member 4 and the inner circumferential surface (or mouth edge) of the powder outlet 12 on the side, there is a gap in the guide tube 1 on the powder outlet 12 side. Air flows in through it. The powder Y supplied into the guide tube 1 is transferred to the screw blade 22
The powder is sequentially transferred to the powder filling chamber 14 side and temporarily stored in the powder filling chamber 14.

Then, as shown in FIG. 2, the powder filling chamber 1
When the powder Y is almost full in the powder Y, the gap between the outer circumferential surface of the blocking member 4 and the inner circumferential surface of the powder outlet 12 is completely closed. In this state, the powder inlet 11 and the powder outlet 12 are each blocked by the powder Y, so air from the outside does not enter into the guide tube 1, and the deaeration efficiency of the air intake device 3 is greatly improved. improve. When the subsequent powder Y is further pushed into the powder filling chamber 14 from the state shown in FIG. Y is compressed, and the deaeration effect of the powder Y in the powder filling chamber 14 is further promoted.

When the pressing force exerted by the powder Y in the powder filling chamber 14 on the front surface of the closing member 4 becomes greater than the urging force of the urging means 5, the pressing force causes the closing member 4 to press against the urging means 5.
, and the powder outlet 12 is opened. When the powder outlet 12 is opened in this way and the subsequent powder Y is pushed into the powder filling chamber 14 by the screw blade 22, the powder Y in the powder filling chamber 14 is kept in a compressed state and is sequentially pushed into the powder filling chamber 14. The powder is pushed out from the powder outlet 12 and then discharged from the discharge port 16 to the outside (for example, into a storage bag).

[0030] Thus, according to this powder deaerator,
Since the blocking member 4 is installed in a state where it is urged in the direction of closing the powder outlet 12 by the urging means 5, the powder Y sent later by the screw blade 22 is temporarily stored in the powder filling chamber 14. and can be compressed, greatly improving deaeration efficiency.

Further, in this embodiment, in the urging means,
By adjusting the degree of threading of the nut 56 threaded onto the adjustment bolt 55, the strength of the elastic force of the coil spring 58 can be changed. The degree of compression can be adjusted accordingly. If the degree of screwing of the nut 56 is adjusted, the distance between the guide plate 53 and the shielding member 4 will change, but in that case, the degree of screwing of the guide plate 53 to the fixed plate 51 may be adjusted or By adjusting the fixing position of the fixing plate 51 with respect to the screw shaft 21, the closing member 4 may be adjusted to be at a position corresponding to the powder outlet 12 when the coil spring 58 is in its most extended state.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal section of a powder deaerator according to an embodiment of the present invention.

FIG. 2 is a partially enlarged sectional view of FIG. 1;

FIG. 3 is a state change diagram of FIG. 2;

FIG. 4 is a schematic diagram of a conventional powder deaerator.

[Explanation of symbols]

1 is a guide cylinder, 2 is a screw conveyor, 3 is an intake device,
4 is a blocking member, 5 is a biasing means, 11 is a powder inlet, 12 is a powder outlet, 13 is a porous cylindrical portion, 14 is a powder filling chamber, 21
22 is a screw shaft, 22 is a screw blade, and 22a is a terminal end of the screw blade.

Claims (1)

[Claims] 1. A porous cylindrical part (11) having a powder inlet (11) at one end and a powder outlet (12) at the other end and having air permeability (
A screw shaft (21) is inserted into the guide cylinder (1) having a
) is equipped with a screw conveyor (2) for transferring powder provided with screw blades (22) around it, and further equipped with a vacuum suction type suction device (3) around the outer periphery of the porous cylindrical part (13). A body deaerator, wherein the screw shaft (2
Terminal end (22a) of the screw blade (22) provided in 1)
by a predetermined length from the powder outlet (12) position of the guide tube (1) to a position closer to the powder inlet side, and the screw blade end position and the powder outlet position in the guide tube (1). A powder filling chamber (14) is provided between the screw shaft (21) and an annular blocking member (4) having an outer diameter capable of closing the powder outlet (12). Exit (12)
The shielding member (4) is fitted so as to be able to move forward and backward between a closed position where the powder outlet (12) is closed and an open position where the powder outlet (12) is opened.
When the shielding member (4) is urged toward the powder outlet closing position side on the rear side and a pressing force of a predetermined pressure or more is applied to the front surface of the shielding member (4), the pressing force causes the Shielding member (
4) is provided with an urging means (5) having an elastic force capable of retracting the powder to the powder outlet open position side.