JP3086666B2 - Powder filling device with 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 apparatus for filling a bag with a predetermined amount of powder, and more particularly, to a degassing device capable of degassing air in powder in the bag. The present invention relates to a powder filling device with a pneumatic device.

[0002]

2. Description of the Related Art For example, powder such as powdered milk is packed in a fixed amount by a powder filling device. However, when the powder is simply packed, a large amount of air is mixed between the powder particles. As a result, the filling efficiency is deteriorated (bulky), and if there is a large amount of residual air in the bag, the bag is easily broken during loading / unloading or lamination.

[0003] By the way, to degas the air in the powder,
Conventionally, there are cases in which the process is performed after filling the powder into the bag, and cases in which the process is performed before filling the powder into the bag.

[0004] In the case of degassing after filling the powder in the former bag, first, as shown in FIG. 6 (A), the powder P stored in the tank 1 is supplied to the powder feeding device 2. To fill the bag Y by a predetermined amount. The powder supply device 2 can supply a predetermined amount of the powder P in the tank 1 by rotating a screw rod 21 installed in the powder passage tube 10 by a motor 20. In addition, the bag Y is supported by the weighing device 4, and when the weighing device 4 detects a predetermined weight, the supply of the powder is stopped (the motor 20 is stopped) by the signal. . A predetermined amount of powder P in bag Y
Is filled, the powder-containing bag Y is then moved to another location as shown in FIG. 6 (B), where the air in the powder P in the bag is degassed by the degasser 5. . In this case, deaeration rod 5
A vacuum suction device (blower) 7 suctions the deaeration terminal 52 at the lower end of the bag 0 to a predetermined depth (near the bottom) in the powder P in the bag as indicated by reference numeral 52 '. Degass the air in the powder. The deaeration bar 50 is moved up and down by an air cylinder 61.

[0005] When the latter powder is evacuated before filling the bag, for example, as shown in FIG.
Inside, a deaeration cylinder 53 made of a porous material is installed so as to cover the outer periphery of the screw rod 21, and air between the deaeration cylinder 53 and the powder passage cylinder 10 is sucked by the vacuum suction device 7. I have. Therefore, in the conventional example shown in FIG. 7, when the powder P passes through the powder passage tube 10 of the powder supply device 2, it is degassed from the outer periphery thereof. Conventionally, as shown in FIG. 7, after the powder P deaerated by the deaeration cylinder 53 installed in the powder passage cylinder 10 is filled in the bag Y, the bag P as shown in FIG. The powder P in Y may be degassed again in another step.

[0006]

However, FIG. 6 (A)
As shown in (B), when the powder filling operation and the degassing operation of the powder P in the bag are performed in separate processes, the installation space of the entire line becomes large, and the movement of the bag and the change of the bag are performed. There was a problem that a device was required.

On the other hand, as shown in FIG.
In the case of degassing at the outer peripheral portion of 1, the filling operation can be performed while degassing, but the body diameter of the powder feeding device 2 becomes large. The powder P filled in the bag is once degassed when passing through the powder passage tube 10, but a small amount of powder P is supplied from the lower end outlet of the powder passage tube 10. Since the powder P falls one after another, a large amount of air is contained in the powder P. In this state, the powder P filled in the bag Y contains considerable air. Therefore, in order to increase the degassing rate of the powder P in the bag Y, it is necessary to degas the air in the powder P in the bag in another step as shown in FIG. 6B, for example. .

The present invention has been made in view of the above-mentioned conventional problems, and has been made to reduce the size of a line for powder filling and degassing, and to improve the degassing rate of powder charged in a bag. It is an object of the present invention to provide a powder filling device with a degassing device.

[0009]

The present invention has the following structure as means for solving the above-mentioned problems.

According to the first aspect of the present invention, a downwardly-facing cylindrical powder passage tube is connected to the bottom of a tank for storing powder, and a powder supply tube is provided in the powder passage tube. A powder filling device in which the screw rod is installed in an upright position and the powder in the tank can be filled into the bag from the lower end outlet through the powder passage cylinder by rotating the screw rod. It is targeted. The bag is supported below the lower end outlet of the powder passage tube, and the powder supplied from the lower end outlet of the powder passage tube can be sequentially dropped and filled into the bag. Further, the invention of claim 1 of the present application is provided with a degassing device for degassing the air in the powder filled in the bag.

In the deaerator of the first aspect of the present invention, the shaft of the screw rod is a hollow shaft, and a deaeration rod having a deaeration terminal at a lower end portion is provided in the hollow shaft. The powder passage is inserted so as to be able to move up and down freely within a range in which it can move down from the lower end outlet to a predetermined lower position. The degassing device includes a vertical moving device for moving the degassing bar up and down, and a vacuum suction device for sucking air in the degassing terminal.

In the powder filling apparatus with the deaeration device according to the first aspect of the present invention, after a predetermined amount of the powder is filled in the bag supported below the lower end outlet of the powder passage cylinder, the deaeration is performed by the vertical movement device. By lowering the rod, the degassing terminal is inserted to a predetermined depth in the powder in the bag, and the air in the powder can be degassed by sucking the air in the degassing terminal with a vacuum suction device. It has become. Therefore, the air in the powder filled in the bag can be degassed at the powder filling position.

According to a second aspect of the present invention, in the powder filling apparatus with the degassing device according to the first aspect, the lower part of the flight of the screw rod is further provided than the lower end of the hollow shaft of the screw rod. While a coil-shaped flight portion extended in a coil shape to the bottom,
The screw rod is installed such that the coiled flight portion is located in the powder passage tube, and the deaeration terminal is positioned at the center of the coiled flight portion in a state where the deaeration rod is moved to the uppermost position. It is set to be at the same height as.

According to the second aspect of the present invention, during the powder filling operation using the screw rod, the air in the deaeration terminal is discharged by the vacuum suction device while the deaeration terminal is positioned at the same height as the coiled flight portion. Can be aspirated. Therefore, even during the powder filling operation (while passing through the inside of the powder passage cylinder), the deaeration can be performed, and the air in the powder filled in the bag can be reduced.

According to a third aspect of the present invention, in the powder filling apparatus with the degassing device according to the first or second aspect, the powder supplied into the bag from the lower end outlet of the powder passage tube is provided. It is provided with a weighing device for weighing, and a lifting device for raising and lowering the weighing device together with the bag.

In the powder filling apparatus with the deaerator according to the third aspect of the present invention, the weighing device can be moved up and down together with the bag by the lifting device. The bottom can be brought close to the lower end outlet of the powder passage tube, and the bag can be gradually lowered as the amount of powder charged into the bag increases from that state. By doing so, the falling height of the powder supplied from the lower end outlet of the powder passage cylinder 10 is reduced, and as a result, the amount of dust generation and the amount of air mixed in the powder can be reduced.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A powder filling apparatus with a deaerator according to an embodiment of the present invention will be described below with reference to FIGS. It is suitable for filling and deaeration of fine-grained powder as described above.

As shown in FIGS. 1 and 2, a powder filling apparatus according to this embodiment includes a tank 1 for storing powder P to be treated, and a powder supply connected to the bottom of the tank 1. Device 2
A bag holding device 3 for holding a bag Y containing powder supplied from a lower end outlet 11 of the powder supply device 2, and a weighing device for measuring the powder P filled in the bag Y Device 4, a lifting device 43 for lifting and lowering the measuring device 4 together with the bag Y, and a degassing device 5 for degassing the air contained in the powder P
A vertical movement device 6 for vertically moving a deaeration bar 50 (described later) of the deaeration device 5.

The powder supply device 2 is configured by inserting a screw rod 21 in a vertical orientation into a powder passage cylinder 10 extending downward at the bottom of the tank 1. The screw rod 21 is supported by a bearing 25 in the upper part of the tank 1. The screw rod 21 is rotated by a motor (servo motor) 20 so that the rotation speed can be adjusted.

The screw rod 21 has a helical flight 23 mounted around a shaft 22 having a hollow inside (hereinafter referred to as a hollow shaft) 22. The length of the flight 23 is substantially the same as the entire length of the powder passage cylinder 10 and
Is slightly smaller than the inner diameter of the powder passage tube 10. The flight 23 has its upper half wound around the outer peripheral surface of the hollow shaft 22, while its lower half extends in a coil shape below the lower end of the hollow shaft 22 by a predetermined length. The coil-shaped flight portion 24 is provided.

The screw rod 21 is installed such that the entire length of the flight 23 corresponds to the powder passage tube 10. In this embodiment, the lower end of the hollow shaft 22 corresponds to a position about half the height of the powder passage tube 10.

The bag holding device 3 includes a frame 31 surrounding the outside of the powder passage tube 10, and a chuck 3 attached to the frame 31.
And 2. Although the chucks 32 are provided at four places on the lower surface of the frame body 31 in the illustrated example, two chucks (two upper and lower places in FIG. 3) at the center in the width direction of the bag mouth may be held. .

The bag holding device 3 is supported by a measuring device 4. The weighing device 4 includes two load cells 4
1,41 are used. Each of these load cells 41, 4
As shown in FIG. 3, 1 is arranged so as to sandwich the powder passage tube 10 from the outside facing position. In this embodiment, the frame 31 is suspended and supported at the tip of each of the load cells 41.

Measuring device 4 (each load cell 41, 41)
Is supported by a lifting device 43 so as to be able to move up and down. The lifting device 43 is for moving the bag Y held by the bag holding device 3 up and down together with the weighing device 4.
Has a motor (servo motor) 45 that can rotate forward and reverse, a screw rod 46 (right-hand screw) rotated by the motor 45, and a screw cylinder 44 screwed to the screw rod 46. Each of the load cells 41, 41 has its base end connected to a screw cylinder 44 of a lifting device 43 via arms 42, 42, respectively.

The elevating device 43 controls the motor 45, for example, as shown in FIG.
When the screw 45 is rotated to the left, the screw rod 46 rotates to the left and the screw cylinder 44 moves down (the weighing device 4 and the bag holding device 3 also move down). Conversely, when the motor 45 is rotated to the right, the screw rod 46 moves to the right. The screw cylinder 44 rotates and moves upward (the weighing device 4 and the bag holding device 3 also move upward). The motor 45 of the elevating device 43 slowly lowers the screw cylinder 44 while corresponding to the amount of powder supplied by the powder supply device 2 (the amount of powder charged into the bag Y) at the time of driving on the lower movement side ( (The rotation speed of the motor 45 is slow.) However, when the drive is performed on the upward movement side, the rotation is performed at a high speed and the screw cylinder 44 is moved upward in a short time.

The deaerator 5 includes a deaeration rod 50 having a deaeration terminal 52 attached to a lower end of a long air pipe 51, and an air pipe 5.
1 has a vacuum suction device (blower) 7 which is continuous via an electromagnetic switching valve 71. Also, in this embodiment,
A compressed air supply device (compressor) 8 for backwashing is connected to the air pipe 51 via another electromagnetic switching valve 81.
As shown in FIG. 5, the deaeration terminal 52 is formed of a porous material and formed in a cylindrical shape having a predetermined length. In addition, in this porous material, an infinite number of fine holes are formed to allow passage of air but to prevent passage of powder particles.

The deaeration rod 50 is installed so as to be vertically movable in the hollow shaft 22 of the screw rod 21. The deaeration bar 50 can be moved up and down by the up and down movement device 6. An air cylinder 61 is used in the vertical movement device 6. The compressed air from the compressor 62 is switched by an electromagnetic switching valve 63 to expand and contract the air cylinder 61 and move the deaeration rod 50 up and down. Has become.

When the deaeration rod 50 is moved to the uppermost position by the vertical movement device 6, as shown in FIG. 1, FIG. 2 or FIG.
The deaeration terminal 52 is positioned so as to be located between the lower end height of the hollow shaft 22 of the screw rod 21 and the height of the lower end outlet 11 of the powder passage tube 10. In a state where the deaeration rod 50 is moved to the lowest position by the vertical movement device 6, the lower end of the deaeration terminal 52 is positioned near the bottom of the bag Y held by the bag holding device 3 as shown in FIG. Set to reach.

The powder filling apparatus with a deaerator of this embodiment is used as follows. Before the start of the operation, the screw cylinder 44 of the elevating device 43 moves down to the position indicated by the reference numeral 44 ', and the bag holding device 3 is on standby at the position indicated by the reference numeral 3'.
The deaeration bar 50 is also stationary at the uppermost position. And
When the operation is started, the electromagnetic switching valve 71 on the vacuum suction device 7 side
Is turned on, and the air in the degassing terminal 52 is sucked. Then, as shown by a solid line arrow in FIG. 5, air near the outer periphery of the degassing terminal 52 passes through the porous material portion of the degassing terminal 52 and is sucked into the degassing terminal 52, and the coil of the screw rod 21 is coiled. The air in the powder P in the round flight section 24 is degassed.

In this state, each chuck 3 of the bag holding device 3
2 holds the rim of the bag Y (the state indicated by the symbol Y 'in FIGS. 1 and 2), the bag holding signal from the chuck 32 causes the motor 45 of the lifting / lowering device 43 to rotate at high speed, and the screw cylinder 44,
The weighing device 4, the bag holding device 3, and the bag Y are moved up to the position shown by the solid line in a short time. When the motor 45 stops, the motor 20 of the powder feeding device 2 is operated, the screw rod 21 is rotated, and the powder P in the powder passage tube 10 is sequentially turned by the flight 23 into a coiled flight portion. It is fed into the bag Y from the lower end outlet 11 through 24. At this time, the powder P passing through the inside of the powder passage tube 10 is degassed by the degassing terminal 52 at the coiled flight portion 24, so that the powder P falls into the bag Y with little contained air. Further, in the initial stage of the powder filling operation, the bag Y is moved up by the lifting device 43, and the bag Y is gradually moved by the lifting device 43 as the amount of powder charged into the bag increases. Because it is made to descend, the powder passage cylinder 10
The height from the lower end outlet 11 to the bottom of the bag Y or the upper surface of the powder in the bag is always small.
Does not generate much dust from the powder P falling from the bottom to the bag bottom.

When the powder P supplied from the lower end outlet 11 of the powder passage tube 10 is filled in the bag Y, the amount of powder charged in the bag Y is measured by the measuring device 4 (load cell 41). The motor 20 of the powder supply device 2 is temporarily stopped when the filling amount reaches a preset filling amount (immediately before filling). Subsequently, the deaeration rod 50 is moved down by the vertical movement device 6, and the deaeration terminal 52 is inserted to a predetermined depth of the powder P in the bag as shown in FIG. Degas P. Thereafter, the deaerator 50 is moved upward by the vertical movement device 6,
At this time, the electromagnetic switching valve 71 on the vacuum suction device 7 side is turned off, the electromagnetic switching valve 81 on the compressed air supply device 8 side is turned on, and the compressed air from the compressed air supply device 8 is turned into a dotted arrow in FIG. And the powder adsorbed on the outer surface of the degassing terminal 52 is peeled off (backwashed). When the deaeration rod 50 reaches the uppermost position, the electromagnetic switching valve 81 on the compressed air supply device 8 side is turned off, and the electromagnetic switching valve 71 on the vacuum suction device 7 side is turned on. The second motor 20 is rotated slowly, and a small amount of powder is supplied from the lower end outlet 11 of the powder passage tube 10, and the remaining amount of powder is filled in the bag Y. When the weight is detected, the motor 20 of the powder supply device 2 is stopped. At this point, the powder bag Y has been lowered to the lowermost movement position. If the chucks 32 of the bag holding device 3 are released and the powder bag Y is removed, the next powder bag Y is removed. A filling operation can be performed.

As described above, in the powder filling device with the degassing device according to the embodiment of the present invention, since the degassing bar 50 with the degassing terminal 52 is inserted through the center of the screw rod 21, the powder into the bag is removed. The filling operation and the deaeration operation of the powder in the bag can be performed at the same position, and the operation of moving and holding the bag as shown in FIGS. 6A and 6B becomes unnecessary. Further, even if the degassing device 5 is provided in the powder filling device, the outer diameter of the powder passage tube 10 does not increase, and the entire line can be made compact. Furthermore, during the operation of filling the powder into the bag Y, the powder is deaerated by the deaeration terminal 52 when passing through the lower half of the powder passage tube 10, so that the powder is contained. The bag can be filled with little air. In addition, bag holding device 3
Is gradually lowered from the upper movement position by the elevating device 43, so that the drop height of the powder supplied from the lower end outlet 11 of the powder passage tube 10 becomes small, and accordingly, The amount of dust generation is reduced.

[0033]

The powder filling apparatus with a deaerator according to the present invention has the following effects.

According to the first aspect of the present invention, a deaeration rod 50 provided with a deaeration terminal 52 at a lower end portion is vertically movably inserted into a hollow shaft 22 of a screw rod 21. Since the deaeration rod 50 can be moved up and down by the vertical movement device 6, an operation of filling the bag Y with the powder P and an operation of deaeration of the air in the powder P filled in the bag Y Can be performed at the same position. Therefore, it is not necessary to move the powder-containing bag after the powder filling operation to the degassing place,
This eliminates the need for a device for moving the bag and a device for holding the bag, thereby reducing the equipment cost, and also has the effect that the entire line can be made compact even with the degassing device 5.

According to the second aspect of the present invention, the lower part of the flight 23 of the screw rod 21 is further lower than the lower end of the hollow shaft 22 in the powder filling apparatus with the deaerator of the first aspect. The coiled flight portion 24 is extended so as to extend in a coil shape, and the deaeration terminal 52 is set to be positioned at the same height as the coiled flight portion 24 when the deaeration rod 50 is moved to the uppermost position. .
Therefore, in claim 2 of the present application, in addition to the effect of claim 1 described above, the deaeration operation can be performed even during the powder filling operation using the deaeration terminal 52, and the powder having a small content of air is stored in the bag. There is an effect that it can be filled.

According to the third aspect of the present invention, in the powder filling apparatus with the deaerator according to the first or second aspect, the weighing device 4 can be moved up and down together with the bag Y by the elevating device 43. During the powder filling operation, the bag Y is gradually lowered from the upper moving position, so that the powder supplied from the lower end outlet 11 of the powder passage cylinder 10 has a falling height range. Can be reduced. Therefore, in claim 3 of the present application, in addition to the effect of claim 1 or 2, the amount of dust generated at the time of powder falling can be reduced, and air is less likely to be mixed into the powder filled in the bag. There is.

[Brief description of the drawings]

FIG. 1 is a side view of a powder filling device with a deaerator according to an embodiment of the present application.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is an enlarged sectional view taken along the line III-III of FIG. 1;

FIG. 4 is a state change diagram of FIG. 2;

FIG. 5 is a partially enlarged view of FIG. 2;

FIG. 6 is an explanatory view showing a conventional powder filling step and a degassing step.

FIG. 7 is a sectional view of a conventional powder filling device with a deaerator.

[Explanation of symbols]

1 is a tank, 2 is a powder feeding device, 3 is a bag holding device, 4 is a measuring device, 5 is a deaerator, 6 is a vertical moving device, 7 is a vacuum suction device, 8 is a compressed air supply device, 10 is Powder passage cylinder, 1
1 is a lower end outlet, 21 is a screw rod, 22 is a hollow shaft, 2
3 is a flight, 24 is a coiled flight part, 41 is a load cell, 43 is a lifting device, 50 is a deaerator, 51 is an air tube, 52 is a deaeration terminal, P is a powder, and Y is a bag.

Claims (3)

(57) [Claims] 1. A downwardly-facing cylindrical powder passage tube (10) is continuous with the bottom of a tank (1) for storing powder (P), and powder is supplied into the powder passage tube (10). Screw rod (2
The powder (P) in the tank (1) is passed through the powder passage cylinder (10) from its lower end outlet (11) by rotating the screw rod (21) to set the powder (P) in the vertical position. A powder filling device capable of filling a bag (Y), wherein a shaft of the screw rod (21) is a hollow shaft (22), while a hollow shaft (22) has a lower end portion inside the hollow shaft (22). The deaeration rod (50) provided with the deaeration terminal (52) is vertically movably inserted in a range where the deaeration terminal (52) can be moved down to a predetermined lower position from the lower end outlet (11) of the powder passage cylinder. And a vertically moving device (6) for vertically moving the deaeration bar (50), and a vacuum suction device (7) for sucking air in the deaeration terminal (52). Powder filling device with deaerator. 2. The screw rod (2) according to claim 1,
The lower part of the flight (23) of 1) is connected to the screw rod (2).
While the coiled flight portion (24) is extended in a coil shape below the lower end of the hollow shaft (22) in 1), the screw rod (21) is used as the coiled flight portion (24). It is installed so as to be positioned in the body passage tube (10), and the deaeration terminal (52) is attached to the coiled flight portion (24) at the center of the coiled flight portion (24) when the deaeration rod (50) is moved to the uppermost position. A powder filling device with a degassing device, wherein the powder filling device is set so as to be located at the same height as the flight portion (24). 3. A weighing device (4) according to claim 1, wherein the powder (P) filled in the bag (Y) is weighed from a lower end outlet (11) of the powder passage tube (10). And a lifting device (4) for raising and lowering the weighing device (4) together with the bag (Y).
3) A powder filling device with a degassing device, comprising: