JPH04311403A - Powder filling device and filling method - Google Patents

Abstract

PURPOSE:To fill a powder uniformly with a high density, in a bag with air permeability. CONSTITUTION:The present filling device is equipped with a powder feeding pipe 3 which is airtightly connected with a vacuum chamber, and holes 1A, 2A are provided on the wall of the vacuum chamber which receives a bag 4, and the holes 1A, 2A and a suction means which is located outside are connected by die space parts 1B, 2B, connecting joints 8a, 8b and connecting hoses 9a, 9b.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to a powder filling device and a filling method, and more particularly to a powder filling device and a filling method that make it possible to fill a breathable bag with powder at a high density and uniformly. It is about the method.

0002

[Prior Art] Of the generally speaking volumes of powder,
The actual volume of the powder itself is a fraction of that, and most of it is occupied by gas. In other words, commonly used powder storage bags contain several times the actual volume of the powder, which is extremely wasteful. Moreover, if a large amount of gas is contained in the powder, various problems arise when handling the powder. For example, when taking out powder from a bag or filling it with powder, the powder not only scatters into the atmosphere and contaminates the working environment, but also causes a large loss of the powder itself because it is scattered over a wide area.

[0003] In order to improve the above-mentioned problems, a method that has been generally used in the past will be explained with reference to the drawings.

The apparatus shown in FIG.
and a diaphragm 15.

The powder 5 passes through a hopper chute 14 and is stored in a bag 4. By vertically vibrating the diaphragm 15, the bag 4 placed thereon is vibrated to remove the gas present between the powder particles.

The apparatus shown in FIG. 4 includes pressure plates 16a and 16b.
It is equipped with

[0007] The bag 4 containing the powder is placed between pressure plates 16a, 1
It is sandwiched between 6b. Then, by pressurizing with the pressure plates 16a and 16b, the gas existing between the powders is removed.

However, since the deaeration effect of the above two methods was insufficient, the following method has been adopted.

As shown in FIG. 5, this device includes a supply chute 13, a hollow rod 12, and an element 11 made of porous material attached to the lower end of the hollow rod 12.

The lower end of the supply chute 13 has a discharge port 13a.
The opening of the bag 4 is attached to the outlet 13a.

The hollow rod 12 has an element 11 made of porous material at its lower end, and is attached to the supply chute 13 so as to be able to move up and down.

Next, the operation of this device will be explained using FIGS. 5 to 8.

As shown in FIG. 5, the hollow rod 12 is first lowered into the bag 4. As shown in FIG. Then, as shown in FIG. 6, the powder 5 is supplied to the bag 4 through the supply chute 13 and the discharge port 13a, and when a certain amount is reached, the supply is stopped. Thereafter, as shown in FIG. 7, the gas present between the powders is removed by suction through the porous element 11 buried in the powders 5. As a result, the apparent volume of the powder 5 decreases, and the upper surface B of the powder 5 after degassing
is lower than the upper surface A before degassing. When the deaeration is finished,
As shown in FIG. 8, the hollow rod 12 is raised and received within the supply chute 13. Thereafter, the mouth of the bag 4 is closed, and the filling of the powder 5 into the bag 4 is completed.

[0014]

[Problems to be Solved by the Invention] However, the conventional method described above has the following problems.

[0015] Since the powder 5 is stored in the bag 4 in a state in which it contains gas, that is, in a state in which the apparent volume is large, it is necessary to use a large bag 4 compared to the contained weight. .

[0016]Although degassing is effective in the vicinity of the porous element 11, the effectiveness decreases as the distance from the element 11 increases. That is, the powder 5 in the bag 4
This means that the air is non-uniformly degassed, and the density of the powder 5 in the bag 4 varies.

The present invention was made to solve the above-mentioned problems, and compared to the conventional method, it is possible to use a bag 4 that is smaller than the weight contained, and the powder 5 can be stored at a high density and uniformly. The purpose of the present invention is to provide a filling device and a filling method that allow the bag 4 to be filled at any time.

[0018]

[Means for Solving the Problems] A filling device according to the present invention includes a vacuum chamber which forms a space closed by a wall having a through hole and receives a breathable bag, and a bag which is airtightly connected to the vacuum chamber. The vacuum chamber includes means for supplying powder into the vacuum chamber, and means for sucking gas inside the vacuum chamber through the through hole.

The filling method according to the present invention includes a step of placing a breathable bag in a vacuum chamber, a step of suctioning and exhausting the gas in the vacuum chamber, and a step of filling powder into the bag simultaneously with the suction and exhausting step. It is equipped with

[0020]

[Operation] According to the filling device and filling method of the present invention,
The powder supply section, the vacuum chamber, and the suction means are airtightly connected. Therefore, when the gas inside the vacuum chamber is sucked, the pressure inside the vacuum chamber decreases. As a result, a pressure difference occurs between the powder supply section and the vacuum chamber, and the powder is supplied into the bag due to the pressure difference. That is, deaeration and supply of powder are performed simultaneously. This makes it possible to fill the air-permeable bag with powder at a high density and uniformly.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below with reference to the drawings.

A filling device according to an embodiment of the present invention is shown in FIG.
As shown in FIG. 2, it is composed of an upper mold 1, a lower mold 2, and a supply pipe 3.

The upper mold 1 has a recessed portion on its inner surface so that the bag 4 can be accommodated therein. A plurality of holes 1A communicating with a mold space 1B provided inside the upper mold 1 are provided in the recess at predetermined intervals. The mold space 1B also includes a connection joint 8a and a connection hose 9.
It is connected to external suction means by a.

Like the upper mold 1, the lower mold 2 also has a recessed portion on its inner surface, and in the recessed portion, a plurality of holes 2A communicating with the mold space 2B are provided at predetermined intervals. Furthermore, the mold space 2B is connected to external suction means through a connecting joint 8b and a connecting hose 9b.

The supply pipe 3 is inserted into the upper mold 1 and the lower mold 2 through the mouth of the bag 4. At this time, the seal packings 7a and 7b are also inserted into the connecting portion, so that the connecting portion is in an airtight state.

In this embodiment, the decompression chamber in this invention is a space formed by the recesses of the upper and lower molds, and the area around the decompression chamber is kept airtight by the seal packings 7a, 7b, 6a, and 6b. ing.

Next, the filling method will be explained with reference to FIG.

First, the bag 4 is placed in the recess of the lower mold 2. At this time, the opening of the bag 4 is placed at the connection between the supply tube 3 and the lower mold 2. After inserting the supply pipe 3 into the mouth of the bag 4, the upper mold 1 and the lower mold 2 are fixed. At that time, upper mold 1 and lower mold 2
Since the seal packings 7a, 7b, 6a, and 6b described above are sandwiched between the two, the contact portion between the upper mold 1 and the lower mold 2 is in an airtight state.

Next, suction is performed by the suction means. first,
Connection hoses 9a, 9b and connection joints 8a, 8b
The gas in the mold spaces 1B and 2B is sucked through the mold spaces 1B and 2B. Then, the gas in the vacuum chamber connected to the mold spaces 1B, 2B through the holes 1A, 2A is sucked. As a result, the bag 4 is expanded and shaped into a vacuum chamber. Thereafter, the gas inside the bag 4 is sucked, so that the inside of the bag 4 is in a reduced pressure state.

[0030] Therefore, the pressure inside the supply pipe 3 becomes greater than the pressure inside the bag 4, so that a pressure difference is created between the two. Due to this pressure difference, the powder 5 is supplied into the bag 4. That is, the powder 5 is filled into the bag 4 while degassing and supplying are repeated.

[0031] After the filling is completed, the degassing effect disappears, so the supply of powder is automatically stopped. In addition, in the case of this example, since the holes are provided throughout the wall of the decompression chamber,
It becomes possible to suck the gas inside the bag 4 from the entire outer surface of the bag 4. Therefore, the density of the powder 5 contained in the bag 4 is high and the bond is strong, and the state is similar to that of being pressed with a pressure of about 0.5 to 1 kg/cm2 by a press or the like. It has become.

[0032]

[Effects] According to the present invention, it is possible to fill a bag with powder in a high-density and uniformity, and at the same time, it is also possible to use a bag that is smaller than before, so that the bag can be saved. Furthermore, since the powder is supplied by the pressure difference between the pressure inside the bag and the pressure in the powder supply section, there is no need to supply the powder by dropping it from above as in the past, but from the side. supply is also possible. This eliminates the need for a tall device. Furthermore, various forms of molding and filling are possible depending on the shape of the decompression chamber.

[Brief explanation of drawings]

FIG. 1 is a front view of an embodiment according to the invention.

FIG. 2 is a sectional view of an embodiment according to the invention.

FIG. 3 is a schematic front view of a conventional vibrating filling device.

FIG. 4 is a schematic front view of a conventional pressurized filling device.

FIG. 5 is a diagram showing a hollow rod being lowered in a conventional degassing type filling device.

FIG. 6 is a diagram showing how powder is being supplied in a conventional degassing type filling device.

FIG. 7 is a diagram showing how the apparent volume decreases after degassing in a conventional degassing type filling device.

FIG. 8 is a diagram showing a hollow rod being raised in a conventional degassing type filling device.

[Explanation of symbols]

1 Upper mold 1A, 2A hole 1B, 2B mold space 2 Lower mold 3 Supply pipe 4 Bag 5 Powder 11 Porous material element 13 Supply chute 15　Vibration plate 16a, 16b Pressure plate Note that the same reference numerals in the figures indicate the same contents or corresponding parts.

Claims (2)

[Claims] 1. An apparatus for filling powder into a breathable bag, the vacuum chamber forming a space closed by a wall having a through hole and receiving the bag into the space;
A powder filling device, comprising: a powder supply means that is airtightly connected to the reduced pressure chamber and supplies powder into the bag; and a suction means that sucks and exhausts gas in the reduced pressure chamber through the through hole. 2. A method for filling powder into a breathable bag, the method comprising: placing the bag in a vacuum chamber; sucking and exhausting gas in the vacuum chamber; and sucking and exhausting the gas. A powder filling method comprising the step of simultaneously filling the bag with powder.