JPS5920353Y2 - Peripheral discharge type semi-natural grinding mill - Google Patents

Description

[Detailed description of the invention] The present invention supplies crushed stone obtained by crushing a large block of mined rock into the mill body, and further crushes it by applying impact, displacement, compression, etc. to the crushed stone. The present invention relates to a peripheral discharge type semi-autogenous grinding mill that crushes or grinds the crushed material or fine aggregate to a desired particle size, and then discharges the crushed material to the outside of the mill body.

Conventionally, in the peripheral discharge type semi-autogenous grinding mill of the above-mentioned type, the material input into the mill for crushing or pulverization is crushed by the action of the rail liner or crushing bar attached to the inner peripheral surface of the drum of the mill as the mill rotates. In this case, the products crushed to an appropriate particle size within the mill body are crushed through a plurality of discharge grates installed around the drum. The light slag discharged from the screen is pulverized and discharged out of the shell by an air flow passing through the mill body.

However, when operating the peripheral discharge type semi-autogenous grinding mill as described above in a dry manner, the amount of input raw material, that is, the raw material level, is naturally determined in order to obtain the optimal crushing efficiency. When operating at a raw material level of
Although the product has already been crushed to a predetermined particle size, it is obstructed by the raw material layer and remains in the mill without being discharged, resulting in a reduction in processing capacity and over-grinding.

In order to avoid this, the raw material level is lowered to a level that allows smooth discharge, and then the grates, screens, deflector liners, crushing bars, etc. are This will cause a significant decrease in lifespan.

On the other hand, when the peripheral discharge type semi-autogenous grinding mill is operated in a wet manner, the discharge grate or screen is installed around the drum outer circumference, so that the water is discharged while it is not doing enough work, like in a centrifugal dehydrator. If a larger amount of water is not replenished, the water treatment effect will be diminished, and there is a risk that slag will adhere to the inside of the mill and cause clogging, resulting in a loss of functionality.

The purpose of this invention is to eliminate these drawbacks, and its gist is to supply raw materials such as crushed stone obtained by crushing large blocks of mined rock into the mill body. In a peripheral discharge type semi-autogenous grinding mill of the type in which a product of a desired particle size is obtained by imparting impact, transfer, compression, etc. to the crushed stone by the rotation of the mill body, the mill body is connected to a rotating drum and the raw material for this rotating drum. A shell is integrally joined to the side facing the input side, a deflector liner, a crushing bar, etc. that are involved in crushing are attached to the rotating drum, and a plurality of discharge grates or screens are provided around the entire circumference of the shell. , Furthermore, during the crushing operation, a layer of large lumps is formed in the lower part of the rotating drum, forming successive layers.
The shell rotates so that the crushed products in the upper layer of the middle lump layer and powder layer are transferred into the shell and discharged from the discharge grate or screen, and the incompletely crushed raw materials that cannot be discharged are returned to the rotating drum. It consists in the fact that it has a truncated conical shape that widens towards the drum, and thus,
According to the present invention, the mill body is divided into a drum that is exclusively involved in crushing and a shell that is involved in product discharge, and the shell is provided with a discharge grate or screen for discharging materials to be crushed or fine aggregate. In this case, the materials to be crushed or fine aggregate are layered from the outside in the order of a large lump layer, a medium lump layer, and a powder layer due to the centrifugal force generated by the rotation of the mill and the size of their bulk specific gravity. The raw material level in the drum can be maximized and the residence time of the feed water can be kept longer than in conventional mills, thus allowing for a longer residence time of the feed water. In this case, it is possible to prevent a decrease in processing capacity and over-grinding due to excessively high or low levels of crushed raw materials, and the life of the discharge grate, screen, deflector liner, crushing bar, etc. is not impaired, and in addition, in the case of a wet type, the mill for slag It has the advantage that it does not adhere to the inside or cause clogging and does not lose its function.

Next, the present invention will be explained in more detail with reference to the drawings.

First, Fig. 1 schematically shows a conventional dry peripheral discharge type semi-autonomous grinding mill, in which 1 is the mill body, 2 is a deflector liner, 3 is a rail-shaped crushing bar, 4,
Reference numeral 5 designates a discharge grating or screen, in which crushed stone fed from the direction of arrow A is charged into the mill body 1, compressed by the deflector liner 2 and the crushing bar 3 as the mill body rotates, and is subjected to impact. After being transferred and crushed or pulverized, products with the desired particle size (crushed material or fine aggregate) are discharged from the discharge grate or sufnones 4 and 5 to the outside of the mill body (in the direction of arrow B), and a light slag is produced. The fraction is pulverized and discharged to the outside in the direction of arrow C by an air flow passing through the mill body.

Furthermore, FIGS. 2 to 4 show peripheral discharge type semi-autogenous grinding mills according to the present invention, in particular, FIG. 2 is a dry type, and FIGS.
The figure shows a wet type, and a drum 12 forming the mill body 11.
A plurality of deflector liners 13 and liners 14 are provided inside the crushing zone a, and a plurality of rail-shaped crushing bars 15 are provided inside the drum circumference. Band b)
is provided with a plurality of first and second discharge grates or screens 17, 18, the shell 16 being integrally joined to the side wall 19 of the drum 12 in FIG. It is formed in the shape of

In this case, the taper angle of the shell is preferably around 30 degrees.

In FIGS. 3 and 4, the major axis of the shell corresponds to the drum diameter and is integrally joined to the peripheral edge 20 of the drum,
In this case, the taper angle of the shell is also preferably about 30 degrees.

In the mill shown in FIG. 2, crushed raw materials such as crushed stone supplied from the direction of arrow A are crushed or pulverized in the drum 12 and then transferred to the discharge grate or screen 17.
18 as a product or fine aggregate to the outside (in the direction of arrow B), and the pulverized light slag is discharged to the outside in the direction of arrow C by the air flow passing through the mill body.

In this case, two products with different particle sizes are obtained separately from the first and second discharge grates or screens 17 and 18, which have different mesh sizes.

In the mill shown in Fig. 3, crushed raw materials such as crushed stones supplied together with water from the direction of arrow A are crushed or pulverized in the drum 12, and then the pulverized slag is discharged together with water into the first discharge chamber. The aggregate is discharged from the grate or screen 17, and the other crushed material or fine aggregate is discharged from the second discharge grate or screen 18 (in the direction of arrow B).

Next, a specific example of the mill schematically shown in FIG. 3 will be explained with reference to FIG. In this case, these trunnions are each supported by a bearing mounted on the foundation (not shown), and one trunnion 21 is supplied with crushed raw material 23 along with water from the direction of arrow A, and the other trunnion 22 is supplied with water. The mill main body is rotationally driven by being connected to an appropriate drive transmission mechanism so as to be rotatable, and as the mill body is rotated, the crushed raw material 23 such as crushed stone is moved by the cooperation of the deflector liner 13, liner 14, and crushing bar 15. The shells are crushed or pulverized by applying impact, transfer, compression, etc. due to the action, and the shells are separated from the drum 12 (crushing zone a) as shown in the figure due to the centrifugal force generated by the rotation of the mill and the bulk specific gravity of the material to be crushed. 16 (product discharge zone b), a large lump layer 24, a medium lump layer 25, and a powder layer 26 are stacked in this order.

That is, in the crushing zone a, there is a large lump layer 24, and in the product discharge zone, a medium lump layer 25 and a powder layer 26 are located corresponding to the second and first discharge grates to the screens 18 and 17, respectively. In order to be layered in this manner, the crushed stone or fine aggregate in the medium lump layer 25 is washed with water from the second discharge grate or the screen 18, and the pulverized slag in the powder layer 26 is washed away from the first discharge grate or the screen 18. The water is discharged from the screen 17 to the outside together with water.

In addition, in the above-mentioned example, explanation was given for the case of a wet type, and only one type of product (fine aggregate) of a predetermined size can be obtained, but in the case of a dry type, the pulverized slag is stored in the mill body 11. first and second exhaust grate or screen 1 for exhaust from the trunnion 22 with the airflow passing through the
Two types of products (fine aggregate) can be obtained by using different sieve sizes for sieves 7 and 18, and instead of obtaining fine aggregate for concrete from rock or crushed stone, it can be obtained by using a converter, blast furnace, etc. The same purpose can be achieved by using the resulting slag as a material, and it can also be applied to the production of sand to be used for other purposes.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view showing a conventional peripheral discharge type semi-autogenous grinding mill, FIGS. 2 and 3 are schematic sectional views showing different peripheral discharge type semi-autogenous grinding mills of the present invention, and FIG. The figure is an axial half-sectional front view showing the specific example of FIG. 3. Note that the correspondence relationship between the main parts shown and the symbols is as follows. 11... Mill body, 12... Drum,
16...Shell, 17.18...1st
and second discharge grate or screen, 19...
・Drum side wall, 20...Drum periphery, 23...
...Crushed raw material, 24...Large lump layer, 25...
...Medium lump layer, 26...Powder layer.

Claims (1)

[Scope of utility model registration request] Raw materials such as crushed stone obtained by crushing a large block of mined rock are fed into the mill body, and the rotation of the mill body applies impact, transfer, compression, etc. to the crushed stone to produce a product with a desired particle size. In the peripheral discharge type semi-autogenous grinding mill of the type obtained, the mill body is formed of a rotating drum and a shell integrally joined to the side surface of the rotating drum opposite to the raw material input side,
A deflector liner, crushing bar, etc. that are involved in crushing are attached to the above rotating drum, and multiple discharge grates or screens are provided around the entire circumference of the above shell, and layers are sequentially applied from the bottom inside the rotating drum during the crushing operation. The crushed products in the upper layers of the large lump layer, medium lump layer, and powder layer that are generated are transferred into the shell and discharged from the discharge grate or screen, and the incompletely crushed raw materials that cannot be discharged are returned to the rotating drum. A peripheral discharge type semi-autonomous grinding mill characterized in that the above-mentioned shell has a truncated conical shape that widens toward the rotating drum.