JPS5835088B2 - Powder mixing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention mainly relates to a powder mixing device used for homogeneously mixing cement raw materials.

As shown in Fig. 4, the conventional mixing device consists of an air source device a, a silo body b1, and a dust collector C. The most important part is the ventilation plate d, which can be used to group the ventilation plates, change the arrangement, and change the arrangement of the ventilation plates. Efforts have been made to perform ventilation in a pulsating manner, or to perform cyclical ventilation with partial differences in ventilation pressure.

Recently, as plants have become larger, mixing equipment has also become larger, but as the diameter of the silo body increases, the mixing capacity decreases, so in order to generate a low-density mixture in the center of the silo body, the As shown, a riser e7i-mounted device has also been developed.

However, in these continuous overflow type mixing devices, a part of the input powder is directly discharged without being subjected to mixing action, a so-called short pass, which causes a decrease in the mixing effect. There is.

The object of the present invention is to prevent the above-mentioned short path and improve the mixing effect.

Furthermore, the aim is to reduce the size of the apparatus by shortening the mixing time.

An embodiment of the present invention will be described with reference to the drawings. In Fig. 1, an umbrella 3 for dispersing powder on the head and a powder discharge port 4 are shown.
A riser pipe 2 having a powder intake port 5 at the bottom thereof is provided in the center of the silo 1, and a shelter (
A partition plate) 6 is installed, and the inside of the silo 1 is separated from the inside of the shelter N,
The silo body M is divided into silo bodies M, the upper part of the shelter 6 is made higher than the position of the overflow outlet 31, and the silo body M and the inside N of the shelter are communicated at the top part.

In addition, at the bottom of the shelter 6, there is a silo body M and an inside N of the shelter.
An opening 40 is formed to allow communication between the two.

Further, a ventilation plate 7 is provided at the bottom of the silo 1, and the ventilation plate 7
, as shown in FIG. 2, ventilation plate groups 10, 11, which have an inclination of 15° with respect to the horizontal plane toward the center of the silo body 1;
12, 13, a flat ventilation plate 8 in the center, and an in-groove ventilation plate 1 having a slope of 3 degrees with respect to the horizontal plane and descending toward the side walls.
4 and the ventilation plate 9 inside Sheltero.

1 to 3, an air line 19 is connected to each vent plate 10, 11, 12, 13 via valves 17, 18 connected to an air distribution device 16 operated by a timer 15; In addition, an air supply pipe 21 is connected to the in-groove ventilation plate 14 which receives ventilation independently through a valve 20 without passing through the air distribution device 16, and low-pressure air is supplied to form a low-velocity region.

In addition, an air pipe 24 is connected to the central ventilation plate 8 which receives ventilation through the valve 22, and an air pipe 25 is connected to the ventilation plate 9 which receives ventilation through the valve 23, and high pressure air is supplied to the high-speed region. Form.

In addition, in the figure, 26, 27, 28, 29 are flowmeters, 30 is a powder input [], 32 is an exhaust bag filter, 36 is a low pressure air source device, 37 is a high pressure air source device, 33 is an emergency outlet,
34 is an aerodynamic feeder, and 35 is an emergency damper.

To explain how this invention is used, powder is fed into the silo main body M from the powder inlet 30.

As described above, a high-speed flow is constantly ejected into the riser pipe 2 by the ventilation plate 8 and into the shelter N by the ventilation plate 9 to form a high-speed region, and a low-speed flow is constantly ejected from the in-groove ventilation plate 14 to prevent the above-mentioned high-speed flow. A low-velocity flow region having a lower velocity than the flow region is formed, and a periodically moving low-velocity flow is ejected from the ventilation plates 10, 11, 12, 13 around the riser pipe 2 by the action of the air distribution device 16.

In the silo main body M, the powder descends outside the riser pipe 2 and then flows into the riser pipe 2, and most of the powder rises again inside the riser pipe 2 and is discharged from the umbrella 3 and the powder discharge port 4 for circulation. Movement is performed and mixed.

A portion of the powder flows into the shelter N through the opening 40.

The incoming powder has been circulated at least half a time in the silo main body M, and has been circulated more than that.

The powder is raised in the N shelter by a high-speed flow, mixed homogeneously along the way, and discharged to the outside from the overflow outlet 31.

This invention provides a central part in the silo 1 configured as described above,
By sequentially forming high-speed, low-speed, and high-speed air regions in the groove and shelter 6, the powder entering the groove is circulated and mixed in the high-speed region in front of the groove. Therefore, the center portion and the groove act as if they were openings for the shelter 6, and can prevent the powder from entering the shelter 6 without being mixed and being discharged, that is, a so-called short pass.

This allows the performance of the mixing device to be greatly improved.

Therefore, since the above-mentioned short path can be prevented, the device can be made smaller.Furthermore, the airflow inside the shelter 6 is made faster than the airflow caused by the in-groove ventilation plate 14, and an overflow outlet 31 is formed inside the shelter 6. This allows the powder to be forcibly moved into the shelter 6 through the groove, raised upward, and continuously discharged.

[Brief explanation of the drawing]

Fig. 1 shows an embodiment of the present invention, and Fig. 2 is a longitudinal sectional front view, Fig. 2 is a sectional view taken along the line ■-■ in Fig. 1, Fig. 3 is a piping diagram of the invention, and Figs. 4 and 5. is a front view of a conventional example. 1...silo, 2...-rising pipe, 3.
...Umbrella, 4...Powder discharge port, 5...
...Powder intake, 6...Shelter, 7...
・・Vent plate, 31・・・・・Overflow outlet, 40
...Opening, M... Silo body, N.
...Inside the shelter.

Claims (1)

[Claims] 1. A shelter that surrounds the overflow outlet and extends in the vertical direction is provided in a silo having an overflow outlet at the upper part of the side wall, and the top of the shelter is formed higher than the overflow outlet position, and the upper and lower parts of the shelter are respectively connected to the silo. A groove is provided that communicates with the main body and has a downward slope on the shelter side from the center of the bottom of the silo main body to the lower end of the shelter, and forms an air region above the groove inside the silo main body and within the groove. 1. A powder mixing device, characterized in that a ventilation plate is provided in the central part of the silo main body and inside the shelter, each of which forms an air region having a higher velocity than the ventilation plate above the ventilation plate.