JP2801157B2 - Powder deaerator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a powder filling device for filling various kinds of powder such as flour into a packaging bag, etc., and degass the powder put into a hopper and sends it out from a discharge port. The present invention relates to a screw conveyor type powder deaerator.

[0002]

2. Description of the Related Art A powder filling apparatus (for example, Japanese Utility Model Publication No. 5-47041) for automatically filling a packaging bag with powder such as flour.
Japanese Patent Application Publication No. JP-B-61-27241) includes a hopper, a powder supply device, and a powder supply device. In this powder filling apparatus, powder is charged from a hopper to an input port of a powder supply apparatus, and the powder input to the input port is transported by a screw conveyor, sent out from an output port, and fed into the powder feeding apparatus. It is supplied to the supply port of the supply device.
Then, the powder supplied to the supply port of the powder supply device is pressure-fed toward the supply port by the filling screw, and is sent from the supply port to the powder filling pipe through the flexible pipe joint, The powder is filled into the packaging bag through the powder filling tube.

[0003] In the above-described powder filling apparatus, the powder introduced from the hopper into the inlet of the powder supply apparatus takes in air, has an apparent bulkiness, and has an increased fluidity. I have. When the powder in such a state is transferred by the powder supply device and is to be filled into the packaging bag by the powder transfer device, a large packaging bag is required, and the packed form becomes a water pillow. The contents are loose,
It may be difficult to handle. Furthermore, there is a danger that the packing bags filled with the powder are easily collapsed when stacked, and the powder is scattered from the filling port during or after the packing, so that the outer surface of the packing bag may be reduced. And polluting the surrounding environment.

In order to prevent the above-mentioned problem from occurring, in a powder supply device, air is expelled from the powder before the air is taken in and the powder whose apparent bulk is increased is supplied. Is deaerated to forcibly reduce the apparent bulk.

[0005] As a method of deaeration from powder, there are a natural deaeration method in which the powder is stored in a tank or a hopper for a relatively long time and a natural deaeration is performed, and a mechanical force is applied. There is a forced deaeration method to deaerate. Conventionally, as a forced deaeration method,
A method of forming a cylindrical cylinder with a screw conveyor inside using a fine-grained filter material and depressurizing and depressurizing the outer peripheral side of the cylindrical cylinder, a hollow deaeration with a closed end and a cylindrical surface formed with a filter material A method in which a rod is inserted into powder, and the hollow portion of the deaeration rod is depressurized and deaerated, a pair of drums are arranged in parallel with each other and a gap is provided between both outer peripheral surfaces, and one or both drums are arranged. The outer peripheral wall of the drum is formed of a filter material, and while depressurizing the inside of the drum, the two drums are rotated to pass the powder through the gap between the outer peripheral surfaces of the pair of drums, and deaeration is performed between them. is there.

[0006]

Among the conventional powder degassing methods, the natural degassing method is time-consuming and requires a supply operation of the powder until the powder is in an appropriate degassing state. Often not. On the other hand, in any of the conventional forced deaeration methods, clogging of the filter material occurs, and therefore, it is necessary to periodically clean the filter material by backwashing, and maintenance is troublesome. In addition, since degassing is performed only locally through the filter material, the degassing state of the powder becomes non-uniform.On the other hand, it takes a lot of time to uniformly degas the powder. Therefore, there is a problem that the processing capacity is reduced.

The present invention has been made in view of the above circumstances, and it is not necessary to clean the filter material as in the conventional forced degassing method, and it is not necessary to spend time. To provide a powder deaerator that can uniformly deaerate the entire surface of the powder, thereby reliably eliminating the powder filling problem caused by the powder taking in air and increasing the apparent bulk. An object of the present invention is to save time required for deaeration of the body, increase processing capacity, and facilitate maintenance and management.

[0008]

According to a first aspect of the present invention, there is provided a helical propulsion blade fixed to a rotating shaft, and a powder injected into an input port formed near a rear end is provided. A screw conveyor that transfers toward the discharge port formed on the front end side and feeds out the powder from the discharge port, a driving unit that rotationally drives a rotating shaft of the screw conveyor, and a screw conveyor toward the discharge port. In a powder deaerator equipped with compression deaeration means for gradually compressing and deaerator the transferred powder, the propulsion blades of the screw conveyor are rotated.
Omit the part near the shaft outlet and remove the screw.
The part of the rotary shaft of the conveyor that is omitted the propulsion blades
Arrange the hopper so that it penetrates the inside, and the hopper
Degassing characterized by having an outlet at the lower end
In the apparatus, the propulsion blade of the screw conveyor rotating
Omit the part near the discharge port of the spindle,
The part of the rotary shaft of the re-conveyer where the propulsion blades are omitted
Hopper is arranged so that
The outlet is formed at the lower end of the frame.

The invention according to claim 2 is the invention according to claim 1.
In the invention of the above, the pitch of the propulsion blade of the screw conveyor is
Gradually decrease from the inlet to the outlet.
The feature is that it is made.

[0010] The invention described in claim 3 is claim 1 or
3. The powder degassing apparatus according to claim 2, wherein
The conveyor was tilted upward from the inlet to the outlet.
And features.

[0013]

In the powder deaerator having the above-mentioned structure, the powder introduced into the inlet near the rear end of the screw conveyor is transported by the propulsion blades of the screw conveyor toward the outlet at the front end. In the omitted part of the propulsion blade
And the accumulated powder becomes the propulsion impeller.
To be pushed sequentially by the powder sent later
It is compressed more gradually and the powder is stored in the hopper
While being compressed further by gravity . Then, when the powder is compressed, the air taken in the powder is expelled from the powder and removed, and the bulk density of the powder increases accordingly. At this time, the deaeration of the powder is performed uniformly on the whole of the powder, and there is no local deaeration unlike the conventional forced deaeration method.

In the powder deaerator according to the second aspect ,
The space surrounded by the blade surfaces before and after the propulsion blades of the screw conveyor and the inner peripheral surface of the cylindrical cylinder gradually narrows from the input port to the discharge port. It is compressed by being gradually pushed into a narrow space while dropping.

In the powder deaerator according to the third aspect ,
Since the powder is pushed up against the gravity by the propeller blades of the screw conveyor, the powder is gradually compressed.

[0017]

Preferred embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention, and is a view schematically showing a schematic configuration of a powder deaerator. The powder deaerator is disposed in a cylindrical cylinder 44 at an axial center thereof so as to penetrate the cylinder in the axial direction, and has both ends of a bearing 2.
A screw conveyor 46 having a spiral propulsion blade 48 fixed to a rotating shaft 50 rotatably supported at 0 and 20 is provided, and a drive motor 22 for rotating the rotating shaft 50 of the screw conveyor 46 by belt transmission is provided. It is configured. The powder supplied from the hopper 12 to the input port 16 near the rear end of the powder deaerator is
The screw conveyor 46 is driven to rotate in a predetermined direction by the screw conveyor 2 so as to be transported forward in the horizontal direction.

The screw conveyor 4 of this device
6 , the propulsion blades 48 are mounted on the rotation shaft 50 in front of the device.
It is omitted near the end . For this reason, hopper 1
The powder fed from 2 into the inlet 16 is transported by the propulsion blades 48 of the screw conveyor 46 to near the front end of the device, but stays one after another in the omitted portion of the propulsion blades 48 . The accumulated powder is gradually compressed by being sequentially pushed by the powder fed later by the propulsion blade , and is gradually degassed, pushed into the vicinity of the front end of the device , and degassed. In the state of increased bulk density
You. A return blade 49 whose rotation direction is opposite to that of the propulsion blade 48 is fixed to a portion of the rotary shaft 50 on the front side of a portion where the propulsion blade 48 is omitted .

The powder deaerator has a rotating shaft 50.
The secondary hopper 52 is disposed in communication with the cylindrical cylinder 44 so that the omitted portion of the propulsion blade 48 penetrates the inside.
The powder transferred by 8 is pushed into the secondary hopper 52 from the middle abdomen. A discharge port 54 is formed at the lower end of the secondary hopper 52.
Further, a level sensor 56 is attached to the secondary hopper 52, and the level sensor 56 always detects the upper surface position of the powder in the secondary hopper 52. Then, the upper surface position of the powder in the secondary hopper 52 is lower than the screw conveyor 46, and the secondary hopper 5
The powder conveyed into the screw conveyor 46 based on the detection signal from the level sensor 56 in order to prevent the powder pushed into the second hopper 52 from falling toward the bottom of the secondary hopper 52, and to prevent the powder from entraining the air again. Control the rotation speed of the
The transfer amount of the powder is adjusted so that the upper surface position of the powder in the secondary hopper 52 does not drop below the screw conveyor 46. An exhaust pipe 58 is provided above the secondary hopper 52 so that the pressure in the secondary hopper 52 does not increase as the powder is pushed into the secondary hopper 52.

As described above, the secondary hopper 52 is provided.
As a result, the powder is further compressed and degassed by gravity while being stored in the hopper 52 , and the degassing effect is enhanced. And it is degassed and bulk density
Powder formed at the lower end of the secondary hopper 52
It is sent out from the outlet 54. A vacuum pump or the like is connected to the exhaust pipe 58, and the secondary hopper 52
The inside may be made to be in a reduced pressure state, and in this case, the deaeration effect is further improved.

The powder degassing apparatus shown in Figure 2, in order to further improve the degassing effect in the powder degassing apparatus shown in Figure 1, the circular cylinder cylinder 44 and the screw conveyor 46 from the inlet 16 side It is inclined upward to the secondary hopper 52 side. The other configuration is the same as the apparatus shown in FIG. In the apparatus shown in FIG.
Input port 1 by the propulsion blade 48 of the screw conveyor 46
While being transferred diagonally upward from 6 toward the front end of the device
And is gradually compressed and degassed by the action of gravity
Becomes Although not shown, FIGS.
Te was such powder deaerator smell, it is secured to the rotary shaft 50
The pitch of the propelled blades 48 from the inlet 16 in front of the device.
So that it gradually becomes smaller toward the end,
The blade surfaces before and after the propulsion blade 48 of the screw conveyor 46
The space surrounded by the inner peripheral surface of the cylindrical cylinder 44 is
From 16 toward the front end of the device
You may make it. In this case, the hopper 12
The powder that has been fed into the inlet 16 from the
A, which is moved toward the front end of the
During the transfer process, the transfer speed is gradually reduced
It will be gradually pushed into a new space. This
As a result, the powder is compressed and degassed.

The powder degassing apparatus according to the present invention is not limited to a powder filling apparatus for automatically filling powder into a packaging bag, but can be applied to various types of apparatuses for packing powder.

[0027]

Since the present invention is constructed and operates as described above, when the powder degassing apparatus according to the present invention is used, the time required for degassing the powder can be saved. It is possible to increase the processing capacity, and it is not necessary to clean the filter material as in the conventional forced degassing method, so maintenance is easy and the powder is uniformly degassed over the whole. In addition, it is possible to surely solve the problem at the time of powder filling due to an increase in apparent bulk due to the intake of air by the powder.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a schematic configuration of a powder deaerator according to one embodiment of the present invention.

FIG. 2 is a schematic diagram showing a schematic configuration of a powder deaerator according to another embodiment of the present invention .

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 12 Hopper 16 Input port 22 Drive motor 44 Cylindrical cylinder 46 Screw conveyor 48 Screw conveyor propulsion blade 50 Screw conveyor rotating shaft 52 Secondary hopper 54 Secondary hopper outlet

Claims (3)

(57) [Claims] 1. A powder having a helical propulsion blade fixed to a rotating shaft and fed into an inlet formed near a rear end is directed toward an outlet formed at a front end. A screw conveyor for transferring and sending out the powder from the discharge port; a driving unit for rotating and driving a rotating shaft of the screw conveyor; and gradually transferring and degassing the powder transferred toward the discharge port by the screw conveyor. in the powder degassing apparatus having a compression degasser, outlet near the rotary shaft propulsion blades of the screw conveyor
Omitted on the side and screw conveyor
Of the rotating shaft, the omitted part of the propulsion blade penetrates the inside
Hopper so that it discharges at the lower end of the hopper
A powder deaerator having a mouth . 2. A pitch of a propulsion blade of a screw conveyor.
Gradually decrease from the inlet to the outlet.
The powder deaerator according to claim 1. 3. The screw conveyor is discharged from the inlet side.
3. The powder degassing device according to claim 1, wherein the powder degassing device is inclined upward toward the mouth .