JPH04173501A - Powder densifier - Google Patents

Abstract

PURPOSE:To deaerate powder in a feed process thereof and obtain a powder densifying area in which the powder is pressed in a more densified state, by providing a screw type powder feeder having a screw with shorter pitches toward the outlet of guide cylinder which can forcibly charge the powder into a powder charging chamber side. CONSTITUTION:The side clearance 61, the upper clearance 62, and the vertical cylinder 34 are deaerated from respective ports 61a, 62a, 43a of a covering body of a charging chamber 4 by a vacuum pump 6 in a condition that the lower opening 33 of a powder charging chamber 3 is closed by a shutter member 51 and at the same time, powder P is fed in turn into the powder charging chamber 3 by a powder feeder 2. In this time, the powder P transferred in the guide cylinder 21 of the feeder 2 is compressed gradually according to the transferred position by the gradually shortened pitches of screw 23 to squeeze the air contained in the powder P from the outlet or the inlet of guide cylinder 21 to the outside of the guide cylinder. In this way, when the powder feeder 2 equipped with the gradually shortened pitches of screw is applied, the powder P can be deaerated in same extent before it is fed into the powder charging chamber 3.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a powder filling machine used for filling powder into bags (for example, flexible container bags).

(Prior art) A large amount of air is mixed in between each powder particle during the manufacturing stage, transport stage, bagging stage, etc., and the powder is left as is without degassing the powder. Packing into bags will reduce filling efficiency.

Traditionally, degassing devices for powder have been commonly used, which are designed to degas the powder by applying vibrations to the bag while the powder is contained in the bag, causing the powder in the bag to sink. has been done. However, when degassing the powder by vibration in this way, there are problems in that the vibration generator is large-scale, the vibration reduces the durability of the entire device, and the degassing in the powder is difficult. Since this is carried out by using the powder's own weight to make it sink, there is a problem in that if the powder has a low specific gravity, even if it is subjected to vibration for a long time, the packing density cannot be increased very much. In particular, powders with lower specific gravity should be packed with higher density, but such vibrating deaerators are not suitable for degassing powders with low specific gravity.

Conventionally, as a deaeration device for powder, for example, as shown in Japanese Patent Publication No. 56-41484, a deaeration rod is inserted into the powder and the air in the deaeration frame is evacuated. A device is known in which the air in the powder is removed by suction.

However, with this known example, a certain effect can be confirmed for a relatively small amount of powder, but when degassing a large amount of powder, the degassing rod is placed close to the degassing rod. Although the air in the powder can be sucked in relatively easily, as time passes, the degassing rod becomes clogged and becomes impossible to suction in a short period of time, and the powder is located far from the degassing rod. There was a problem in that the powder could not be degassed. In addition, if the opening diameter of the bag is large, it is possible to insert multiple deaeration rods into the bag at the same time at intervals, or for example, if the opening diameter is small in relation to the body diameter, such as a flexible container bag. In this case, it is not possible to insert a deaeration rod into the outer diameter portion of the bag body, and the entire powder cannot be uniformly deaerated.

(Object of the Invention) In view of the problems of the conventional degassing device as described above, the present invention is capable of increasing the degassing efficiency by vacuum suction in the powder filling chamber in advance, and also removes the powder from the powder filling chamber. To provide a powder filling machine capable of charging powder into a bag with high density and further promoting deaeration by forcibly injecting the powder into a powder filling chamber. The purpose is to

(Means for Achieving the Object) A powder filling machine according to the invention of claim 1 includes a powder hopper for storing powder, and a porous material that allows air to pass through and prevents the powder from passing through. a vertically cylindrical powder filling chamber having a side circumferential wall and an upper wall and a lower opening for discharging the powder; a powder supplying device for supplying powder to a powder filling chamber; a full state detection means for detecting a full state of powder in a powder filling chamber; A filling chamber covering body having a side circumferential covering wall and an upper covering wall that separate the lower space and the upper space in a sealed manner, a shutter member that opens and closes a lower opening of the powder filling chamber, and a shutter member that opens and closes the shutter member. a lower opening opening/closing device having a shutter driving device to operate; a first air pipe communicating with a side space between a side peripheral wall of the powder filling chamber and a side peripheral covering wall of the filling chamber covering body; Connecting at least the first air pipe of the first air pipe and the second air pipe to a second air pipe communicating in the upper space between the upper wall of the filling chamber and the upper covering wall of the filling chamber covering body. a compressed air supply device to which both the first air pipe and the second air pipe are respectively connected; A first device selectively communicated with the compressed air supply device.
a switching means, a second switching means provided in the middle of the second air pipe and switching between a communication state and a cutoff state between the inside of the upper space and the compressed air supply device; Until the powder is filled to the full, the first switching means is operated to the side where the side space and the vacuum suction device communicate with each other, and the second switching means is operated so that the upper space and the compressed air supply device communicate with each other. When the powder filling chamber is filled with powder until it is full, the first switching means is switched to the side space portion in response to a signal from the full state detection means. and the compressed air supply device communicate with each other, and immediately thereafter, the shutter driving device is operated to open the shutter member, and the second switching means is switched to the side where the upper space portion and the compressed air supply device communicate with each other. It is characterized by comprising a controller that controls switching between the two.

In addition, the invention of claim 2 of the present application is the powder filling machine of the invention of claim 1, in which the powder feeding device rotates the screw rod within the guide cylinder by driving a motor to feed the powder into the powder filling chamber. The invention is characterized in that it employs a screw type powder feeding device which can be forcibly pushed toward the side and the interval between the screeny blades is gradually reduced toward the exit side of the guide tube.

(Function) The powder filling machine of the invention of Claim 1 functions as follows.

First, before supplying powder into the powder filling chamber, the lower opening of the powder filling chamber is closed with a shutter member, and the space between the upper wall of the powder filling chamber and the upper covering wall of the filling chamber covering body is closed. The inside of the upper space and the compressed air supply device are isolated by the second switching means. Then, the first switching means causes the vacuum suction device to communicate with the side space between the side wall of the powder filling chamber and the side wall of the filling chamber covering body, and vacuums the inside of the side space. At the same time, the powder in the powder hopper (in a low density state mixed with air) is sequentially fed into the powder filling chamber by the powder supply device. Then, due to the pressure difference between the side space and the powder filling chamber, the air inside the powder filling chamber passes through the side circumferential wall of the powder filling chamber and is sucked into the side space, and is sequentially drawn into the powder filling chamber. Only the air from the supplied powder mixed with air is discharged outside the powder filling chamber, and the powder filling chamber is filled with powder at a high density. When the powder filling chamber is filled with a predetermined amount of powder (becomes full), a full state detection means (for example, a pressure detector that detects the pressure in the side space can be employed) detects this. A signal is sent to the controller side, and based on the signal issued from the controller, the first switching means is first switched to send compressed air from the compressed air supply device into the side space, and after a very short time (e.g. After about 1 second), the shutter drive device of the lower opening opening/closing device is operated to open the shutter member, and the second switching means is switched to send compressed air from the compressed air supply device into the upper space as well. When compressed air is sent into the side space as described above, the inside of the side space becomes high pressure, and the air in the side space enters the powder filling chamber through the side peripheral wall of the powder filling chamber. However, the air presses the outer circumferential surface of the powder lump that is compacted in a high density state in the powder filling chamber, compressing the powder lump even more, and also compressing the outer periphery of the powder lump. A minute gap is formed between the surface and the inner surface of the side peripheral wall of the powder filling chamber. Additionally, if air passes through the side wall of the powder filling chamber from the side space side toward the powder filling chamber, it may adhere to (clog) the inner surface of the side wall during vacuum suction. The powder particles that have been removed will be exfoliated. Note that when air is sent into the powder filling chamber, the powder lump in the powder filling chamber is solidified in a high-density state and the powder filling chamber is fully filled, so that the very surface layer of the powder lump is Although air comes into contact with the powder, air does not enter the powder mass. In this state, when the lower opening of the powder filling chamber is opened and compressed air is sent into the upper space, the powder mass in the powder filling chamber passes through its own weight and the upper wall of the powder filling chamber. Due to the pressing force of the coming air, the bag is discharged downward from the lower opening (where the opening of the bag can be received) in the form of a lump.

Also, at this time, since an air layer is formed between the outer peripheral surface of the powder mass and the inner surface of the side peripheral wall of the powder filling chamber, there is no frictional resistance between the two when the powder mass is discharged. Ejection is carried out smoothly. After discharging the powder mass from the powder filling chamber, the same degassing operation in the powder as described above can be repeated by returning the lower opening/closing device, each switching means, etc. to the initial settings.

Further, according to the powder filling machine of claim 2 of the present application, a screw-type powder feeding device that can forcibly push the powder is adopted as the powder feeding device, so that it is particularly difficult to push the powder into the powder filling chamber. In the final stage of powder filling, the powder can be forced into the powder filling chamber. In addition, since the interval between the screw blades is gradually reduced toward the exit side of the guide cylinder, the powder is compressed as it passes through the guide cylinder, and is supplied into the powder filling chamber. Deaeration work is also done beforehand.

(Effect of the invention) In the powder filling machine of the invention of claim 1, the air in the powder supplied into the powder filling chamber is deaerated by vacuum suction from the side peripheral wall of the powder filling chamber. As a result, the air in the powder in the powder filling chamber can be evacuated from a large area around the side of the powder filling chamber, which improves the deaeration efficiency and the filling efficiency into the powder filling chamber. will improve. especially,
Even when a powder with a low specific gravity is used, the deaeration is performed by vacuum suction, so that the deaeration effect is efficiently performed. In addition, when the deaeration action in the powder filling chamber is completed, air is sent into the powder filling chamber from the side space side based on a signal from the full state detection means that detects this, so that the powder filling chamber is filled with air. The powder mass filling the powder filling chamber in a high-density state is compressed from its outer circumferential surface, thereby compressing the entire powder mass and making it possible to aggregate it at a higher density. Further, at this time, an air layer with a minute interval is formed between the inner surface of the side circumferential wall of the powder filling chamber and the outer surface of the powder mass inside the powder filling chamber. Immediately after the compressed air from the compressed air supply device is sent into the side space as described above, the lower opening of the powder filling chamber is opened and the compressed air is sent into the upper space. Therefore, the powder mass can be smoothly discharged downward from the lower opening by its own weight and the pressing force of compressed air from above. At this time, since an air layer is formed between the inner surface of the side circumferential wall of the powder filling chamber and the outer surface of the powder lump, no frictional force is generated between the two, and the powder lump falls as a lump. This makes it difficult for air to be mixed into the powder during the discharge operation. Furthermore, as described above, after the powder is filled into the powder filling chamber, air can be sent into the powder filling chamber from the side space side through the side circumferential wall of the powder filling chamber, so that the inner surface of the side circumferential wall is It has many effects, such as being able to separate powder particles that have adhered to each other, automatically removing clogging in the powder filling chamber, and enabling long-term continuous operation.

Moreover, according to the powder filling machine of the invention of claim 2 of the present application, a screw type device that can forcibly push the powder is adopted as the powder feeding device, so that the powder filling machine of the invention of claim 1 is adopted. In addition to the effect of Since the powder is gradually reduced toward the powder filling chamber side by the powder supply device, deaeration is performed in the powder, and the powder is concentrated even more densely. It has the effect of being able to

(Example) Hereinafter, the present invention will be described in detail with reference to FIGS. 1 to 5.

As shown in FIG. 1, the powder filling machine of this embodiment includes a powder hopper 1 for storing powder P to be processed, a powder filling chamber 3 for filling a fixed amount of powder P, and a powder filling chamber 3 for storing powder P to be processed. A powder supply device 2 that sequentially supplies the powder P in the powder hopper 1 into the powder filling chamber 3, a filling chamber cover 4 that covers the outside of the powder filling chamber 3, and a powder filling chamber 3. Lower opening (becomes powder outlet) 3
a lower opening opening/closing device 5 for opening and closing the powder filling chamber 3 and the filling chamber cover 4, and a vacuum suction device (for vacuum suctioning the inside of the space (61, 62) between the powder filling chamber 3 and the filling chamber cover 4 and the inside of the hanging cylinder 34, which will be described later. vacuum pump) 6, a compressed air supply device (funprenocer) 7 that supplies compressed air into the spaces (61, 62) and the hanging cylinder 34, various air pipes 71 to 74, and each air pipe 71 to 74. switching means (for example, electromagnetic switching valves) 81 to 84 provided in the middle, and a controller 10 that controls the switching means 81 to 84 and the lower opening opening/closing device 5;
The basic structure includes a full state detection means 13 for detecting a full state of powder in the powder filling chamber 3.

The powder hopper 1 has a powder outlet 11 formed at its lower end.

The powder supply device 2 is constructed by horizontally disposing a screw rod 22 rotated by a motor 20 in a guide cylinder 21 . The powder inlet of the guide tube 21 is connected to the powder outlet 1 of the powder hopper 1, and the powder outlet of the guide tube 21 is connected to the powder filling chamber 3. The screw blades 23 of the screw rod 22 are attached at gradually decreasing pitches such that the interval gradually decreases from the inlet side to the outlet side of the guide tube 21.

As shown in FIGS. 2 and 3, the powder filling chamber 3 is made of a cylindrical porous plate having a large number of micropores that allow air to flow but prevent the powder P from passing through. shaped side wall 31
and an upper wall 32 that closes the upper part. The lower part of the side peripheral wall 31 is left open (lower opening 33). Further, the powder filling chamber 3 of this embodiment is provided with a hollow small-diameter hanging cylinder 34 extending downward from the upper wall 32 through the center of the side peripheral wall 31 to an appropriate depth. This hanging tube 34 is also formed of the porous plate described above, and is configured to allow air to flow inside and outside the hanging tube 34, but to prevent the powder P from passing through. Further, this hanging cylinder 34 has an open upper part and a lower part closed with a lid material.

When a pressure difference occurs between the inside and outside of the powder filling chamber 3, air freely passes through the walls of the side circumferential wall 31, the upper wall 32, and the hanging tube 34 (from the high pressure side to the low pressure side). still,
In the powder filling chamber 3 in the illustrated example, the vertical length of the side wall 31 is approximately 9
00 mm, the outer diameter of the side peripheral wall 31 is about 320 m+n, the inner diameter of the hanging tube 34 is about 50 mm, the hanging depth of the hanging tube 34 is about 600 mm, and the thickness of each wall is about 3+ nm. In addition, in the illustrated example, the side peripheral wall 31 of the powder filling chamber 3
is formed into a straight cylindrical shape with the same diameter over the entire length in the vertical direction, but in other embodiments, the inner surface may be a tapered surface that slightly widens toward the bottom.

The outlet of the guide tube 21 of the powder supply device 2 opens into the powder filling chamber 3 at a position slightly lower than the middle portion of the side peripheral wall 31 of the powder filling chamber 3 .

The filling chamber covering 4 includes a side peripheral covering wall 41 that covers the outside of the side peripheral wall 31 of the powder filling chamber 3, and an upper wall 3 of the powder filling chamber 3.
It has an upper covering wall 42 covering the upper part of 2. The side peripheral covering wall 41 hermetically covers the outer surface of the side peripheral wall 31 of the powder filling chamber 3 with an annular space (side space) 61 at an appropriate interval, and the upper covering wall 42 also Powder filling chamber 3
Space portions (upper space portions) 6 at appropriate intervals on the upper surface of the upper wall 32
2 is separated and hermetically covered. In addition, the side peripheral portion covering wall 4
1 is assembled in a slightly eccentric state with respect to the side circumferential wall 31 of the powder filling chamber.

A chute 45 for charging the powder P discharged from the powder filling chamber 3 into the bag is connected to the lower part of the side peripheral covering wall 41 of the filling chamber covering 4.

The lower opening/closing device 5 opens and closes the lower opening 33 of the powder filling chamber 3.
Air cylinder drive device (air cylinder) 5 that opens and closes the
2, and a compressor 53 for operating the air shifter 52.
and an electromagnetic switching valve 54. When the air cylinder 52 is extended, the shutter member 51 closes the lower opening 33 of the powder filling chamber 3, and when the air cylinder 52 is contracted, the shutter member 5 opens the lower opening 33 completely. ing.

As shown in FIG.
are connected by respective air pipes 71 to 74. That is, in this embodiment, the side peripheral covering wall 41 of the filling chamber covering 4 has two boats 61a and 6 communicating with the side space 61.
1a, and the upper covering wall 42 of the filling chamber covering body is provided with one boat 62a communicating with the upper space 62 and one boat 34a communicating with the hanging cylinder 34. Then, each of the four boats 61a, 61a, 6
2a and 34a are connected to the vacuum pump 6 and the compressor 7 via first to fourth air pipes 71 to 74, respectively, as shown in FIG. Also, the winter air pipe 71
~74, there are first to fourth valves consisting of electromagnetic switching valves.
Switching means 81 to 84 are respectively provided at the positions shown in FIG. Then, the first switching means 81 provided in the middle of the first air pipe 71 and the fourth switching means 84 provided in the middle of the fourth air pipe 74 are opened, and the second air pipe 7
When the vacuum pump 6 is operated with the second switching means 82 provided in the middle of the air pipe 2 and the third switching means 83 provided in the middle of the third air pipe 73 closed, the dotted line in FIGS. As shown by the arrows, the inside of the side space 61, the inside of the upper space 62, and the inside of the hanging cylinder 34 are vacuumed, respectively.
Conversely, when the compressor 7 is operated with the first switching means 81 and the fourth switching means 84 closed and the third switching means 83 and the second switching means 82 opened, the state shown in FIG.
As shown by solid arrows in FIGS. 4 and 5, compressed air is blown into the side space 61, the upper space 62, and the hanging tube 34, respectively. Note that, as in this embodiment, if the hanging cylinder 34 is provided at the center of the powder filling chamber 3 so that vacuum can be drawn from the center of the powder filling chamber 3, the It is possible to degas from both the outer periphery and the center, which improves the deaeration effect in the powder. However, in the present invention, the hanging cylinder 34 is not necessarily essential and may be omitted if necessary. It's okay. Further, in this embodiment, when deaerating the inside of the powder filling chamber 3, vacuum suction is also performed from the upper space part 62, but in other embodiments, vacuum suction is performed from the upper space part 62 side. The effect may be abolished.

In this embodiment, a pressure detector is employed as the full state detection means 13 for detecting the full state of powder in the powder filling chamber 3, and detects the atmospheric pressure in the side space 61. , a detection signal is emitted when the atmospheric pressure drops to a certain level. That is, when the powder filling chamber 3 is filled with deaerated powder close to the permissible limit amount, the amount of air passing through the side peripheral wall 31 of the powder filling chamber 3 is extremely reduced. At that time, the pressure inside the side space 61 is reduced to a predetermined low pressure state, and the low pressure state can be detected by the pressure detector 13. Note that this pressure detector 13 may be provided at a suitable location in the air pipe to detect the atmospheric pressure within the air pipe. In other embodiments,
The full state detection means 13 is a means capable of measuring the amount of powder fed into the powder filling chamber 3, for example, measuring the drive time of the powder supply device 2 per filling into the powder filling chamber. You can also use something like a timer.

Below the /NEET 45 provided below the powder filling chamber,
A mounting table 8 on which the bag B is placed is arranged. This mounting table 8 can be raised and lowered by a lifting device 9, so that the height of the bottom of the bag B can be gradually lowered from a high position according to the amount of powder filled into the bag B. I have to. In this way, the difference in falling height of the powder lump discharged from the outlet of the chute 45 becomes small, and the powder lump becomes difficult to break apart.

Next, the operation of the powder filling machine of this embodiment will be explained together with the control method by the controller 10. As shown in FIG.
1, the inside of the side space 61, the inside of the upper space 62, and the inside of the hanging cylinder 34 are vacuum-suctioned from each boat (61a, 62a, 43a) of the filling chamber cover 4 by the vacuum pump 6. , the powder P is sequentially fed into the powder filling chamber 3 by the powder supply device 2. At this time, the powder P transferred within the guide tube 21 of the powder supply device 2 is
As the guide tube 21 is moved toward the outlet side (powder filling chamber 3 side) by the gradually decreasing pitch screw blade 23, it is sequentially compressed, and the air contained in the powder P is compressed into the guide tube 21. It comes to be squeezed out of the guide cylinder from the outlet or inlet.

In this way, when the powder supply device 2 equipped with the gradually decreasing pitch screw blade 23 is used, the air in the powder P can be deaerated to some extent before the powder P is introduced into the powder filling chamber 3. can. The powder P introduced into the powder filling chamber 3 is vacuum-suctioned in the side space 61, the upper space 62, and the hanging tube 34, and the air in the powder filling chamber 3 is filled with the powder. By suctioning through each wall portion of the chamber 3, degassing progresses in sequence. When the powder filling chamber 3 is full of deaerated powder P, the high-density powder mass passes from the inside of the powder filling chamber 3 through the side circumferential wall 31 to the side space 61 side. The amount of air passing through the side space 61 is extremely reduced, and a large negative pressure is created in the side space 61. Note that even after the powder filling chamber 3 is full of powder P, if the powder feeding action by the powder feeding device 2 is continued, the powder lumps in the powder filling chamber 3 will be removed due to the screw push type. can be compressed even further. When the inside of the powder filling chamber 3 reaches a predetermined negative pressure, the pressure detector 13 detects the pressure and sends the signal to the controller 1.
0 (signal line S,), and based on the signal Sl, the controller 1o first sends a closing operation signal (signal line s l+ s,) to the first switching means 81 and the fourth switching means 84, respectively. and each switching means 81.84
Then, an opening operation signal (signal line s4) is issued to the third switching means 83 to open the third switching means 83, and immediately after that, the electromagnetic switching valve 54 of the under-eaves frontage opening/closing device 5 is opened.
, the operation signal to the air cylinder contraction side (signal line Ss
) to operate the electromagnetic switching valve 54 to the air cylinder reduction operation side, and also to issue an opening operation signal (signal line s6) to the second switching means 82 to open the second switching means 82. Manipulate. The first switching means 81 and the fourth
When the third switching means 83 is opened after the switching means 84 is closed, the compressor 7 is compressed into the side space 61 and the hanging cylinder 34, which are negative pressure chambers, as shown in FIG. Air is sent in and the insides of the side space and the hanging tube become high pressure, and the high pressure air is blown into the powder filling chamber 3 through the walls of the side peripheral wall 31 and the hanging tube 34. At this time, as shown in FIG. 4, the powder lump in the powder filling chamber 3 is removed from the outer circumferential surface Pa in contact with the inner surface of the side circumferential wall 31 and the inner surface Pa in contact with the outer surface of the hanging cylinder 34. Peripheral surface Pb
are pressed by wind pressure and compressed in the radial direction, and between the outer peripheral surface Pa of the powder mass and the inner peripheral surface of the side peripheral wall 31, and between the inner peripheral surface Pb of the powder mass and the outer peripheral surface of the hanging cylinder 34. Air layers A and A with minute intervals are formed between the two. In this way, the inner peripheral surface of the side peripheral wall 31 (and the outer peripheral surface of the hanging cylinder)
When air IA is formed between the outer circumferential surface (and inner circumferential surface) of the powder mass, the frictional force between the two disappears, and the powder mass is in close contact with the inner circumferential surface of the side circumferential wall 31 and the outer circumferential surface of the hanging cylinder 34. Powder particles are peeled off and the filter medium is automatically unclogged.

Then, when the electromagnetic switching valve 54 of the lower opening opening/closing device 5 is operated, the shutter member 51 is retracted and the lower opening 33 is opened, and when the second switching means 82 is operated to open, the compressed air from the compressor 7 is released. is sent into the upper space 62 and the inside of the upper space 62 becomes high pressure, and the high pressure air directs the upper wall 32 of the powder filling chamber 3 from the upper space 62 side toward the inside of the powder filling chamber 3. It will now pass through. Therefore, the powder lump in the powder filling chamber 3 has no frictional force against the wall surface of the powder filling chamber 3, and is pressed by air pressure from the upper surface side of the powder lump.
The lumps are smoothly discharged downward from the lower opening 33, and are then thrown into the bag B from the exit of the sheet 45. Furthermore, until the powder mass is put into the bag B from inside the powder filling chamber 3, air comes into contact only with the surface of the powder mass, so air will not be re-mixed into the powder mass. do not have.

Incidentally, the supply of powder by the powder supply device 2 may be temporarily stopped almost at the same time as the opening operation of the bottom opening member 51 of the lower opening opening/closing device 5 is performed. The powder mass that has been deaerated in the powder filling chamber 3 is transferred to the powder filling chamber 3.
After the air is discharged from the inside, the air cylinder 52 of the lower opening/closing device 5 is extended by a signal from the controller 10, the second switching means 82 and the third switching means 83 are respectively closed, and the first switching means 81 is closed. and fourth switching means 84
is opened, the powder supply device 2 is driven again, and the next powder degassing and filling operation is performed, and once a predetermined amount of deaerated powder is filled into the bag B in the same manner, the process is completed. The work of filling powder into one bag is completed.

[Brief explanation of the drawing]

Fig. 1 is an overall schematic diagram of a powder filling machine according to an embodiment of the present invention, Fig. 2 is a partial vertical sectional view of the powder filling machine of Fig. 1, and Fig. 3 is a Y-Y line in Fig. 2. The sectional views, FIGS. 4 and 5, are state change diagrams of FIG. 2, respectively. 1...Powder hopper 2...Powder supply device 3...Powder filling chamber 4...Filling chamber cover 5...Lower opening opening/closing device 6 ...Vacuum suction device (vacuum pump) 7 ...
... Compressed air supply device (compressor 10 ... controller 13 ... full state detection means (pressure detector) 20 ...
... Motor 21 ... Guide tube 22 ... Screw rod 23 ... Screw blade 3 ] ... Side peripheral wall 32 ... Top wall 33 ... ...Lower opening 41...Side peripheral covering wall 42...Upper covering wall 51...Shutter member 52...Shutter drive device (air cylinder) 54
... Solenoid switching valve 61 ... Side space section 62 ... Upper space section 71 ... First air pipe 72 ... Second air pipe 81 ... ...First switching means 82...Second switching means P...Powder 5'1 Fig. 2...3'!1 Fig. 3 Fig. 4 Fig. 5

Claims (1)

[Claims] 1. A powder hopper (1) for storing powder (P); A vertically cylindrical powder filling chamber (3) having a peripheral wall (31) and an upper wall (32) and a lower opening (33) for discharging powder at the lower part, and the powder hopper (1).
a powder supply device (2) that sequentially supplies the powder (P) in the powder filling chamber (3) into the powder filling chamber (3); and a full state detection means ( 13), and the outer surface of the side peripheral wall (31) of the powder filling chamber (3) and the upper surface of the upper wall (32) of the powder filling chamber (3) are respectively connected to the side space portion (
a filling chamber covering body (4) having a side peripheral covering wall (41) and an upper covering wall (42) which hermetically cover an upper space portion (61) and an upper space portion (62); and a powder filling chamber (3). a lower opening/closing device (5) having a shutter member (51) for opening/closing the lower opening (33) of the powder filling chamber (3) and a shutter drive device (52) for opening/closing the shutter member (51); Side wall (31) and filling chamber cover (4)
) and the side peripheral covering wall (41) of the side space (61)
a first air pipe (71) that communicates with the powder filling chamber (3), an upper wall (32) of the powder filling chamber (3), and a filling chamber cover (4).
a second air pipe (72) that communicates with the upper space (62) between the upper covering wall (42); and at least one of the first air pipe (71) and the second air pipe (72). A vacuum suction device (
6), a compressed air supply device (7) to which both the first air pipe (71) and the second air pipe (72) are respectively connected, and the first air pipe (
71), and is provided in the middle of the side space part (61).
) selectively communicates with the vacuum suction device (6) or the compressed air supply device (7).
and a second switching means that is provided in the middle of the second air pipe (72) and switches between a communication state and a cutoff state between the inside of the upper space part (62) and the compressed air supply device (7). (82
), and until the powder filling chamber (3) is filled with powder (P), the first switching means (81) is switched between the side space (61) and the vacuum suction device ( 6) to the side where the powder filling chamber ( 3) When the powder (P) is filled until it is full, the full state detection means (1
3), the first switching means (81) is switched to the side where the side space (61) and the compressed air supply device (7) communicate with each other, and immediately after that, the shutter drive device (5)
2) to the shutter member opening side, and also control the second switching means (82) to the side where the upper space part (62) and the compressed air supply device (7) communicate with each other. ), and a powder filling machine. 2. As a powder supply device (2), the powder (P) is forcibly pushed into the powder filling chamber (3) by rotating the screw rod (22) within the guide cylinder (21) by motor drive. 2. The powder filling machine according to claim 1, further comprising a screw-type powder feeding device in which the distance between the screw blades (23) is gradually reduced toward the exit side of the guide tube.