CN101690905B - Cone screen overflow - Google Patents

Abstract

The invention discloses a conical surface overflow device, which comprises an annular plate, on which a hollow cone is arranged, a penetrating grid is opened on the conical surface of the hollow cone, and a barrel is sheathed on the annular plate. body. The invention can accomplish the following tasks: 1) when the amount of material in one bin reaches a certain level, it is transported to another adjacent bin; 2) when the amount of material in the grinding cylinder reaches a certain level, it is transported to the mill barrel exterior. It has the following advantages: 1) In the running state, the ball filling rate in the grinding cylinder is basically stable; 2) Relying on gravity or centrifugal force overflow, reducing the pressure and wear in the cylinder; 3) In the planetary ball mill with multiple grinding cylinders 4) It has an "automatic" function, that is, as long as the material in one warehouse reaches a certain height, it will automatically overflow to the other warehouse. At the same time, it has a quick adjustment function, which can stop the trend of continuous increase or decrease when the material in a certain warehouse suddenly increases or decreases.

Description

Cone screen overflow

Technical field:

The invention relates to an overflow device for horizontal drum powder preparation equipment, in particular to a conical screen overflow device used for binning and discharging of large continuous dry-process and wet-process planetary ball mills.

Background technique:

In the ball mill, the material balls are mixed, and the materials must be separated from the balls during continuous discharge. The traditional method uses an end sieve plate to allow the material to pass through the sieve holes and prevent the ball from passing through. The disadvantage of this method is that it is difficult to maintain the predetermined grinding conditions.

The grinding condition in the grinding cylinder is affected by the ratio of material to ball. If the feed-to-ball ratio is too small, direct ball-to-ball collisions will occur. If the feed-to-ball ratio is too large, the material will have an excessive damping effect on the motion of the ball, reducing the force on the powder. Both of these situations will reduce the grinding efficiency. efficiency.

In the static state, people can load the material balls into the mill bin according to the ideal ratio. After operation, the material is continuously fed and discharged, resulting in a dynamic balance problem.

In dynamic balance, the amount of feed must be equal to the amount of output. The former is determined by the output, while the latter is determined by the grid passing area. It is difficult for designers to calculate exactly the required area. If it is too small, the feed amount is greater than the output amount, the error will continue to accumulate, and the material level in the grinding bin will accumulate higher and higher. In serious cases, it may "grow up", otherwise it will decrease, and in serious cases, it may "empty grind"

The present invention-conical surface overflow device can maintain the predetermined optimal material-ball ratio under dynamic conditions. After the overflow hole diameter of the cone screen overflow device is determined, the material exceeding the overflow hole will be quickly discharged out of the bin from a large enough grid, and the material level will not be too high; on the contrary, the material level will not be too high. Low, because the material below the overflow hole has no outflow channel.

The grid of the cone screen does not need to accurately calculate its passing area, as long as it is large enough.

The invention is especially suitable for the discharge structure design of large continuous planetary ball mills. Because the grinding speed of the planetary ball mill is relatively high, and the volume of the grinding chamber is relatively small, the cumulative error in a short period of time will reach an unacceptable level. Therefore, end sieve plates cannot be used.

Invention content:

The invention provides a conical surface sieve overflow device which is beneficial to material overflow.

The present invention adopts following technical scheme:

A cone screen overflow device, comprising an annular plate 2, a conical cap 1 and a cylinder 3 are arranged on the annular plate 2, the conical cap 1 is located in the cylinder 3, and the conical cap 1 is provided with The grid, the inner hole 9 of the annular plate 2 is located on one side of the conical cap 1, the warehouse 11 composed of the annular plate 2 and the cylinder 3 is located on the other side of the conical cap 1, and the inner hole 9 of the annular plate 2 The hole 9 is the feed port, and the grid is the discharge port.

Compared with prior art, the present invention has following advantage:

1) The material-to-ball ratio of a planetary ball mill is very important to the grinding quality and efficiency, especially not to cause "increased grinding" due to too much powder, and the invention can well realize the compartmentalized grinding of the ball mill. The invention can also be used in the discharge device, so that the ratio of material to ball in the barrel remains basically unchanged.

2) Rely on gravity or centrifugal force overflow. If thrust or "wind sweeping" is used, it will not only waste energy, but also may cause excessive material storage in the grinding cylinder due to poor discharge, which will not only increase the wear of the cylinder wall due to the increase in pressure in the grinding cylinder, but also more likely to cause Very dangerous things like breaking the barrel. However, in the present invention, the material overflows through the sieve hole on the conical cap. When overflowing, it can overflow through radial overflow instead of the traditional axial overflow. The rotation of the body relies on the centrifugal force to overflow, and there is no need to add an axial thrust to the material.

3) It has an "automatic" function, that is, as long as the material in one warehouse reaches a certain height, it will automatically overflow to the other warehouse, because when the material overflows is determined by the inner diameter of the ring plate, not by the size of the thrust. At the same time, it has a quick adjustment function. When the material in one warehouse suddenly increases, the material will quickly overflow to the other warehouse through a large enough screen hole; Reservation, not allowing overflow, is conducive to maintaining the material-ball ratio and avoiding empty grinding; in a planetary ball mill with multiple grinding cylinders, because the material-ball ratio is basically unchanged, if the feeding amount of each grinding cylinder is slightly uneven, it will not cause partial gravity out of balance.

Description of drawings:

Fig. 1 is a kind of structure diagram of the present invention. Among them, 1 is a hollow cone, and the half-cone angle φ=10°~30° varies with different powder materials. There is a large enough sieve hole on the cone surface, which varies with different powder materials. The amount of material stored in the cylinder is determined by the cone The diameter of the big end is determined. 2 is an annular plate, which is welded together with the hollow cone, and the outer ring is connected with the inner wall of the cylinder.

Fig. 2 is a schematic diagram of a cone screen overflow device used for discharging, wherein Fig. 2A is a sectional view of the discharge end, and Fig. 2B is a sectional view of the discharge end A-A. As the material is continuously added to the grinding chamber, the material will reach a certain height in the grinding chamber, thereby entering the conical cap 6, falling into the storage chamber 5 through the grid, and entering through the annular gap between the inner diameter of the cylinder and the back circular plate. The low section in the clapboard of the fast conveyor, and then the material is sent out through the conveyor. The invention can automatically maintain the height of the material in the cylinder, prevent "swelling grinding" caused by too much material, and prevent "empty grinding" caused by too little material.

Fig. 3 is a schematic diagram of conveying materials when the cone screen overflow device is used for sub-bins, wherein Fig. 3A is a sectional view of the sub-bins, and Fig. 3B is a sectional view of the sub-bins B-B. As the material is continuously added to the 8th bin, the material will reach a certain height in the 8th bin, and then enter the grid 10, and enter the storage bin 11 through the grid 10, and enter the fast conveying through the annular gap between the inner diameter of the cylinder and the back circular plate. The low-level section in the feeder partition, and then the material is sent into the 13th warehouse through the feeder, and the rapid conveying work between the 8th and 13th warehouses is completed.

Detailed ways:

A cone screen overflow device, comprising an annular plate 2, a conical cap 1 and a cylinder 3 are arranged on the annular plate 2, the conical cap 1 is located in the cylinder 3, and the conical cap 1 is provided with The grid, the inner hole 9 of the annular plate 2 is located on one side of the conical cap 1, the warehouse 11 composed of the annular plate 2 and the cylinder 3 is located on the other side of the conical cap 1, and the inner hole 9 of the annular plate 2 The hole 9 is the feed port, and the grid is the discharge port.

Referring to Figure 1, the present invention includes a conical cap and an annular plate. When the material reaches a certain height and enters the conical cap, it will fall into the storage bin through the grid. Because the position of the center hole of the overflow device relative to the barrel is fixed, the material in this space will remain at a fixed height. Prevent "swelling grinding" due to too much material, and "empty grinding" due to too little material.

The present invention can be used as a discharger. Referring to Figure 2, when the material reaches a certain height and enters the conical cap 6, it will fall into the storage bin 5 through the grid and enter the low-level section of the fast conveyor partition through the annular gap between the inner diameter of the cylinder and the back circular plate, and then The material is sent out through the conveyor. Because the position of the center hole of the overflow device relative to the barrel is fixed, the material in this space will remain at a fixed height. Prevent "swelling grinding" due to too much material, and "empty grinding" due to too little material.

The present invention can be used as a warehouse divider. Referring to Figure 3, as the material is continuously added to the 8th bin, the material will reach a certain height in the 8th bin, and then enter the grid 10, and enter the storage bin 11 through the grid 10, and pass through the ring between the inner diameter of the cylinder and the back circular plate. The gap enters the low-level section in the partition of the fast feeder, and then the material is sent into the 13th warehouse through the feeder to complete the fast conveying work between the 8th and 13th warehouses.

Claims (1)

1. conical surface sieve flash device, it is characterized in that comprising annular plate (2), on annular plate (2), be provided with tapered cap (1) and cylindrical shell (3), tapered cap (1) is positioned at cylindrical shell (3), be provided with grid on tapered cap (1), the endoporus (9) of annular plate (2) is positioned at a side of tapered cap (1), is positioned at the opposite side of tapered cap (1) by the annular plate (2) and the storehouse (11) of tube (3) formation, the endoporus (9) of described annular plate (2) is a charging aperture, and described grid is a discharging opening.

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