JPS5920379B2 - Powder filling method - Google Patents

Description

[Detailed description of the invention] The powder in the bag used in the rubber press molding method, in which powder is filled into a flexible bag and molded by applying water pressure from the outer periphery after sealing, has variations in particle size. is normal.

In this case, it is important to fill the powder 1 uniformly and densely into a flexible bag 2 such as a rubber bag, as shown in Figure 1, in order to produce high-quality, high-yield products. becomes. Now, one of the filling methods is to apply vibration in the atmosphere.
Conventionally, a method has been used to pack the powder at high density by applying blows, but in this method, as shown in Figure 2, the powder 1 is divided into a part A with a large amount of fine particles and a part B with a large number of coarse particles. There was a risk that quality would be compromised. Moreover, the higher the density, the stronger the tendency for separation, which was a problem. In addition, 3 in FIG. 2 is a protection tube in which a large number of holes 4 are bored so that water pressure can be applied effectively. The present invention was proposed in order to solve the above-mentioned conventional drawbacks, and after filling powder under atmospheric pressure into a flexible bag installed in a protective tube with many holes, , a high-density powder mass is obtained by activating the impact hammer and evacuating the inside of the bag after a short delay, and this operation is repeated, and finally, the bag is left in the vacuum state. It is an object of the present invention to provide a powder filling method characterized by sealing.

The present invention will be described below with reference to the embodiments shown in the drawings. In FIG. 3, 1 is a powder, 2 is a flexible bag such as a rubber bag, and 3
is a protective tube with a large number of holes 4 drilled therein. Reference numeral 5 designates a hopper for supplying the powder 1 to the bag 2 from the bag mouth 6 through the guide tube T, and 8 is a guide tube reservoir for preventing the powder from being sucked into the vacuum pump 9.

10 is a valve driven by the driving device 11; 12 is a valve driven by the driving device 13; 14 is a hammer driven by the driving device 15; 16 is a valve that operates the valves 10, 12, the pump 9, and the hammer 14; control device for controlling, 18
1 is an exhaust pipe, and 19 is a control circuit.

Although only one impact hammer 14 is shown in the drawing, a large number of impact hammers 14 may be provided in the vertical direction. Next, the operation will be described. After opening the valves 10 and 12 and filling the bag 2 with powder 1 from the hopper 5 through the guide tube 7 through the bag mouth 6 until it is full, the valve 10 is closed.

At this point, the impact hammer 14 is activated, and the pump 9 is activated a little later than this to exhaust the air in the bag 2 through the guide pipe reservoir 8, valve 12, and exhaust pipe 18. With this hammer operation, the powder is forcibly vibrated, and the bridging phenomenon that occurs when the powder is formed inside the bag eliminates the gas, which collapses the cavity and makes it difficult to form bubble-like spaces. This results in a dense powder mass. At this point, once the hammer 14 is stopped, the valve 12 is closed, the pump 9 is stopped, and the valve 10 is opened, so that the inside of the bag 2 becomes atmospheric pressure. Next, the powder 1 is sufficiently filled into the bag 2 from the hopper 5 again. Next, by operating the valves 10 and 12 in the same manner as described above, striking and vacuum atmosphere filling operations are performed. These operations are then repeated an appropriate number of times to achieve high-density packing. As explained above, the present invention is characterized in that after filling a flexible bag with powder under atmospheric pressure, the impact hammer is actuated to apply a blow, and the inside of the bag is evacuated after a short delay. , the impact and the shrinkage force of the bag due to vacuum evacuation work synergistically, making it possible to obtain a high-density powder mass.
This removes the internal bridging phenomenon from every corner, and by appropriately selecting the impact time and impact strength, it is possible to achieve so-called uniform filling without separating into fine and coarse particles as in the past. be able to.

That is, high-density and uniform filling can be achieved. Finally, by sealing the bag opening 6 of the bag 1 by some means while keeping the inside of the bag 2 in a vacuum, the bag can be vacuum-filled, densely and uniformly filled, and can be used as a soundproof cover for motors, compressors, and other types of rotating equipment. A bag can be obtained which can be used as a soundproofing material. The present invention can also be used for powder molding using a rubber press. As described above, the bag filled with powder obtained by the method of the present invention does not form a cavity due to air bubbles even when external pressure is applied, and an excellent product can be obtained. The above operations are all performed by the control device 1.
Automatic operation is possible using 6.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a conventional powder-filled bag, Fig. 2 is a sectional view showing a conventional state in which powder is not filled uniformly,
FIG. 3 is a sectional view showing an apparatus for carrying out the method of the present invention and the state of powder filled into bags by this apparatus. Explanation of the main parts of the figure, 1...Powder, 2...
... Flexible bag, 6 ... Bag opening, 9 ... Pump, 10, 12 ... Valve, 14 ... Impact hammer.

Claims (1)

[Claims] 1. After filling powder under atmospheric pressure into a flexible bag installed in a protective tube with many holes, a hammer is activated, and after a short delay, the inside of the bag is evacuated. A powder filling method characterized by obtaining a high-density powder mass by repeating this operation, and finally sealing the bag in a vacuum state.