JPS591736Y2 - Sifter for powder separation - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a powder separation sifter (sieve) for separating powder adhering to, for example, synthetic resin pellets.

When handling synthetic resin pellets such as polyethylene, polypropylene, and polystyrene, the powder generated during their manufacture and transportation causes various problems, and although raw material manufacturers are making efforts to separate them, , these are very susceptible to static electricity, and therefore it is very difficult to separate the powder adhering to the pellets.

The present invention attempts to solve the above problem by passing ionized air through the powder-attached pellets, and will be explained below with reference to the drawings.

The shifter housing 1 shown in FIG. 1 is a slightly inclined rectangular box, and by fixing the outer periphery of a wire mesh 2 to the inner circumferential surface of the box over the entire circumference, the wire mesh 2 divides the space inside the housing 1 into an upper chamber 3 and a lower chamber. It is divided into 4.

The wire mesh 2 is also inclined in the same direction as the housing 1, and near its upper and lower ends are provided a powder-coated pellet inlet 5 communicating with the upper chamber 3 and a separated pellet outlet 6. The lower end of 4 is provided with a separate powder take-out lower.

The inlet 5 is connected to the outlet of the hopper 10 via a flexible tube 8 (for example, a bellows made of rubber-like elastic material) and an on-off valve 9.

Inside the hopper 10 are synthetic resin pellets 1 with powder attached.
1 is the insert.

The outlet 6 opens downward, and a hopper 12 for storing separated pellets 11' is disposed below the outlet 6.

13 is an on-off valve. An ionized air outlet 15 whose diameter decreases upward is provided in the center of the earthen wall of the housing 1, and this outlet 15 is connected to the outlet of the fan 18 through a flexible pipe 16 and an ionization unit 17. .

The fan 18 and the ionization unit 17 are attached to a separate frame (not shown), and the ionization unit 17 has an ionization device inside, and employs a static eliminator such as the Simco Niarostat manufactured by Simco Japan Co., Ltd. be able to.

As explained in Japanese Patent Publication No. 48-34079 (Patent No. 727750), the above-mentioned ionization device includes a first conductive member such as a conductive wire, an insulating member covered with the conductive member, and a first conductive member covered with the insulating member. a second conductive member that surrounds the plurality of conductive discharge needles protruding outward from the semiconductive member so as not to come into contact with the conductive discharge needles;
A means for applying an AC high voltage between the second conductive members is provided, a capacitor is formed around the conductive wire by the semiconductive member to capacitively couple each needle and the conductive wire, and the conductive wire is capacitively coupled to each needle. A discharge is generated between the second conductive members, and this discharge can separate air molecules into positive ions and single ions.

The extraction lower is connected to a bag filter type dust collector 22 via a flexible tube 20 and a duct 21.

This dust collector 22 includes a large number of cloth bags 23 in a mouth-shaped housing, and a partition wall 24 to which the upper ends of the bags are connected, and an air chamber 25 above the partition wall 24 opens to the atmosphere through an air outlet 26. , the chamber 27 below the partition wall 24 has an on-off valve 28 at the bottom.

29 is the separated powder.

In order to shake the entire shifter housing 1, an exciter 30 is attached to the housing 1.

The exciter 30 has a structure in which, for example, a shaft having an eccentric weight is rotated by a motor, and can be fixed to the bottom wall of the housing 1 with a plurality of bolts.

When the ionization unit 17 is connected to a power source and the fan 18 is started, the air pressurized by the fan 18 separates into positive ions and negative ions as the air passes through the ionization unit 17, and remains as it is, forming short flexible ions. tube 1
6 and an inlet 15 to enter the upper chamber 3 of the shifter housing.

On the other hand, at the same time as the fan 18 is started, the on-off valve 9 is opened to a predetermined opening degree, and the exciter 30 is started.

Then, the powder-adhering pellets 11 in the hopper 10 pass through the flexible tube 8 and the inlet 5 and fall onto the upper end of the wire mesh 2, and are dispersed on the wire mesh 2 because the wire mesh 2 is shaken by the vibrator 30. During this time, the ionized air flowing down from the inlet 15 passes through the pellet 11, and the ionized air molecules move the charged pellet 11 and the adhering powder on its surface. Neutralize on contact.

As a result, the pellets 11 and the powder on their surface are easily separated, and are actively separated by the vibration received from the wire mesh 2 and the downward airflow supplied from the inlet 15, and the large pellets 11 continue to move on the wire mesh 2 as shown in the arrow. move in the direction
The separated powder falls into the hopper 12 from the outlet 6, falls downward through the wire mesh 2, passes through the duct 21 with the airflow, and enters the dust collector 22.

In the dust collector 22, the powder adheres to the surface of the cloth bag 23, and air passes through the bag 23 and enters the upper air chamber 25, and is discharged into the atmosphere from the discharge port 26.

Powder adhering to the surface of the bag 23 accumulates in the lower chamber 27 naturally due to the action of gravity or by occasional vibration.

As explained above, in the present invention, when the pellets 11 with powder attached move on the wire mesh 2 by the action of gravity and the action of vibrations supplied from the vibrator 30, ionized air passes near the particles. Pellet 1
1 and the powder 29 can be reliably separated and recovered.

When the embodiment shown in FIG. 1 is adopted, the powder that has lost its static electricity is pushed downward by the downward ionized air flow flowing in from the inlet 15, and this is combined with the fact that the wire mesh 2 is shaken by the vibrator 30. This allows the powder to be separated more reliably.

Since the wire mesh 2 is tilted toward the outlet 6 located at a lower position, the powder-adhered pellets 11 that have fallen from the input port 5 quickly spread on the wire mesh 2, making it easier for ionized air to pass through, allowing contact with the ionized air and neutralization. This has the advantage of making it more uniform.

Note that if the amount of air blown by the fan 18 can be reduced to such an extent that the separated powder is not scattered by the ionized air, the ionized air outlet 15 can be provided at the upper end of the lower chamber 4 as shown in FIG.

Note that in FIG. 2, the same symbols as those in FIG. 1 indicate corresponding parts.

When embodying the present invention, the ionization unit 17 is designed to prevent the air ionized in the ionization unit 17 from being neutralized before reaching the powder-attached pellets 11.
It is preferable that the wire mesh 2 and wire mesh 2 be placed as close as possible.

[Brief explanation of drawings]

FIG. 1 is a schematic vertical cross-sectional view of the device according to the present invention, and FIG. 2 is a schematic vertical cross-sectional view showing another embodiment. 1...Shifter housing, 2...Wire mesh (mesh), 3...00, Upper chamber, 4...Lower chamber,
5... Pellet inlet with powder attached, 6...
- Separated pellet outlet, 7...Separated powder outlet, 17...Ionization device, 30...Exciter.

Claims (1)

[Scope of utility model registration request] The shifter housing is equipped with a mesh that divides the upper and lower chambers, a powder adhering pellet inlet and a separated pellet outlet that communicate with the upper chamber, and a separated powder outlet that communicates with the lower chamber. 1. A shifter for powder separation, characterized in that an ionizer is provided with a shaker, and an ionization device is connected to a housing so that ionized air passes through the powder-attached pellets.