JPH0141702Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a device devised for compressing powder in a powder relay storage tank to promote deaeration and increase bulk density. It is something.

(Purpose of the invention) Recently, various powders have been used in many industrial fields. In particular, when handling powder with an average particle size of 1.0μ or less, which is related to the present invention, its bulk density is small, and the challenge is how to improve work efficiency in the powder feeding process and bagging process. was. The solution to this problem is how to increase the bulk density of the powder using a simple method.

(Structure, function, and effect of the invention) The present invention solves this problem, that is, the shaft of the screw feeder is attached to the bottom of the inverted conical powder storage tank 5 to which the lower screw feeder 8 is connected. A rotary compression/deaeration unit 10 is provided with a parallel rotation shaft 1 and a plurality of compression/deaeration blades 2 attached to the rotation shaft, and the powder is interlocked with the powder feed of the screw feeder. This is a powder compression and deaeration device in which the compression blades 2 are repeatedly rotated at high speed.

Next, the device of the present invention will be explained in detail with reference to the drawings. FIG. 1 shows a configuration diagram of a powder relay storage tank, and the powder relay tank 5 may have an inverted conical shape, an inverted conical shape, or a square pyramid shape. A screw feeder 8 is connected to the lower part of this powder relay tank 5, and a powder relay storage tank 5
An automatic compression and deaeration device 10 is provided at the bottom 6 of the tank. In the figure, 7 is a powder inlet, 9 is a deaeration hole, and 11 is a bagging process.

To explain the flow of powder in this powder relay storage tank,
First, the powder is fed through the powder inlet 7, and when the powder enters the relay storage tank to a volume equivalent to approximately 70% capacity, the automatic compression and deaerator 10 is activated, and after 2 to 5 minutes, the screw The feeder 8 operates to send the powder to the bagging process 11. The present invention is an apparatus devised for increasing the bulk density of powder in the above process, and will be explained below with a specific example.

In FIG. 1, the installation locations of the compression and degassing section 10 are as follows. An automatic compression/deaeration unit 10 shown in FIG. 2 is installed in the tapered lower conical portion 6 of the inverted cone-shaped powder relay storage tank 5 shown in FIG. 1 below the line. Reference numeral 7 denotes an input port for feeding powder from the powder silo to the powder relay storage tank 5. 8 is a screw feeder that conveys the powder compressed in the compression and degassing section 10 to the bagging process 11, and 9 is a screw feeder for removing air pressure generated when the powder being conveyed to the bagging process 11 falls. It is a hole. Next, the optimum installation position of this compression degassing unit 10 was the position shown by the - line in Fig. 1, but the vertical fluctuation range was approximately 200 mm from this position.
Similar effects were shown even when m/m was varied up and down. To explain it in an easy-to-understand manner, it was found that the compression vane should be installed within the frame of the lower line of the powder relay storage tank 5. More specifically, the structure of the automatic compression and degassing unit 10 will be explained based on the drawings.

In FIG. 2, reference numeral 1 denotes a shaft for driving blades, which is attached to the lower part of the powder relay storage tank 5. 2 and 3 are compression and deaeration blades, and the compression and deaeration auxiliary blade 3 is set perpendicular to the shaft 1 as shown in the figure, and the compression and deaeration blade 2 has an air bleed hole 4 in the center as shown in the figure. Four to six holes are opened as appropriate.
As shown in FIG. 2, a plurality of compressing and degassing vanes 2 are attached in a semicircular manner from the shaft.

In this case, the number of compression blades does not affect the function of the present invention. That is, the same effect was obtained if the number of sheets was within the range of four. The arrow in the figure indicates the direction of rotation of the shaft, and FIG. 3 shows a cross-sectional view taken from FIG. 1. The dotted line in Fig. 3 shows the driving range of the compression and deaeration blades 2 and 3. The stop position of the compression and deaeration blade 2 is between AB, and when driven, A moves from A to A', and B moves from B to B'. is rotated repeatedly, and the number of repetitions is (A → A') = 1:
Rotate repeatedly at a ratio of (B→B′)=2. The function of the compression and degassing auxiliary vane 3 is to extrude the powder compressed by the compression and degassing vane 2 to the screw feeder 8 and stabilize it.

The function of this device is that the powder is first fed from the powder inlet at the top of the powder relay storage tank 5 shown in Figure 1, and the powder reaches a volume corresponding to approximately 70% of the powder relay storage tank 5. Once entered, the compression and degassing section 10 is automatically activated. At this time, the compressing and degassing vane 2 shown in FIG. 2 compresses the powder toward the screw feeder. Excess air coming out of the compressed powder is removed upward through holes 4 in the compression and degassing vane 2 to promote compression. The compressed powder was cut into pieces with the blades of the compression and deaeration auxiliary vanes 3 installed and pressed against the screw feeder 8 to promote compression.

Finally, we will show a specific example using α-iron oxide powder with an average particle size of 0.65μ. In accordance with the powder feed rate of 5 tons/hour of the screw feeder 8 shown in FIG. 1, the compression vane 10 shown in FIG. 1 is automatically operated at 98 rotations/minute. At this time, the moving speed of the compression deaeration blade 10 to compress the powder is 0.5 to 4.0.
The range of m/sec was suitable. When such an operation is performed, the bulk density of α-iron oxide powder increases by approximately 40% by operating the position of the present invention, and the value is
It went from 0.5g/ml to 0.70g/ml.

As explained above, when bagging fine powder (average particle size 1.0μ or less), the relatively simple device of the present invention can be used to increase the bulk density as much as possible and improve work efficiency. The results achieved by installing this system are significant. The inventors investigated powders other than iron oxide powder (thin particle size with an average particle size of 5.0μ or less), such as heavy tankard, and found similar effects. It was confirmed that the automatic compression and deaeration device of the present invention is effective for increasing bulk density.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a longitudinal sectional view and an explanatory diagram of an automatic compression and deaeration device.
Figure 2 is an explanatory diagram of the structure of the compression and deaeration vane, is a plan view, is a side view as seen from direction A, is a side view as seen from direction B, and Figure 3 is a sectional view taken along the line shown in Figure 1 and compression and deaeration. It is an explanatory diagram of the operating range of. 1... Rotating shaft, 2... Compression vane, 3... Compression auxiliary vane, 4... Air vent hole, 5... Relay storage tank, 6
...Tank conical part, 7...Powder inlet, 8...Screw feeder, 9...Deaeration hole, 10...Compression deaeration part,
11...Bagging process.

Claims (1)

[Scope of utility model registration request] A rotating shaft 1 parallel to the axis of the screw feeder is provided at the bottom of an inverted cone-shaped powder relay tank 5 to which a screw feeder 8 is connected at the bottom. A rotary compression/deaeration unit 10 is installed in which an air blade 2 is attached, a plurality of air vent holes 4 are provided in the blade, and a compression/deaeration auxiliary blade 3 is provided in a direction perpendicular to the rotation axis, and the powder is removed. This is an automatic powder compression and deaeration device in which a compression blade 2 is repeatedly rotated at a speed linked to powder feeding in a screw feeder.