JPS589702B2 - Partition in a mill - Google Patents

Description

Detailed Description of the Invention The present invention is disclosed in Japanese Patent No. 929250 (Japanese Patent Publication No. 53-7653).
This invention relates to an improvement of a partition for a tube grinding mill having a grinding medium as described in No. 1).

This improvement is such that the baffle plate member is constituted by the scoop itself, the scoop extending through an opening formed in the polygonal enclosure, with precisely the ends of the scoop entering the polygonal enclosure and extending inside the enclosure. It depends on a lot of things.

No. 929,250 has a partition downstream of one of the grinding compartments extending laterally therethrough, the partition allowing the passage of ground material of a predetermined size but not allowing the passage of grinding members. an upstream wall with a passage hole of a predetermined size that is not possible, and a downstream wall with a central discharge passage spaced axially from the upstream wall, the upstream wall and the downstream The space between the walls forms a reservoir of crushed material;
The sump includes a scoop, and rotation of the tube mill causes the scoop to pink up material from the sump, raise the material above the mill axis, and direct the material therefrom through the discharge opening in the downstream wall. the scoop is provided with a semi-cylindrical member, the semi-cylindrical member being supported by a rotatable shaft having a member for rotation of the shaft; describes a tube grinding mill in which the material holding volume of the ten cylindrical member can be adjusted by rotating the support shaft.

The method and partition of Patent No. 929,250 has been found to be particularly effective in the form shown in FIGS. 1 and 2.

Nevertheless, this partition, which is economical for large size mills, is very expensive for medium and small diameter mills.

The subject of the invention is a partition used for implementing the control method according to the above-mentioned patent.

Essentially, the invention consists in eliminating the central cone present in the partition according to the above-mentioned patent and replacing it with a baffle plate integral with the scoop.

In addition to the above patent, the partition is constituted by an upstream wall with a calibrated opening and a downstream wall forming a disk of solid material; the downstream wall has a central discharge opening; The walls form a reservoir for the material in which the rotation of the mill propels the material up the axis of the mill and discharges it toward a baffle member. oriented towards the discharge opening and surrounded by a polygonal enclosure provided with holes; as in the above patent, the partition is provided with a scoop with an adjustable useful volume for modifying the level of material in the reservoir. and a control means configured.

The partition forming the subject of the invention is characterized in that the baffle member is constituted by a scoop itself extending through an opening formed in a polygonal enclosure and extending inside said enclosure, and furthermore, characterized by its ends passing through a polygonal enclosure.

Removal of the central cone provides a clear discharge end for the scoop, making it easier to inspect and repair the scoop from inside the mill.

For this purpose, a device for rotating the shovel according to the above-mentioned patent is proposed, in which the scoop is integrated with the scoop and is supported inside a polygonal enclosure and is provided with a flange, the said enclosure extending the pool towards the center of the mill. It can be replaced by a system that provides each scoop with a closing chamber.

The flange is of multi-hole type and can be fixed by nuts to pins integral with the polygonal enclosure.

Control of the scoop is made by selecting the hole through which the pin passes.

By eliminating the cone and replacing it with a multi-hole flange arrangement, manual control from inside the mill was simplified and the cost of the partitions was greatly reduced.

The partition according to the invention improves the method and control according to the above patent and extends it to medium and small diameter mills.

Next, preferred embodiments of the partition in the tube grinding mill according to the present invention will be described in detail with reference to the accompanying drawings.

As shown in Figures 1 and 1A, the partition comprises a frame 10 assembled, preferably by welding, installed within the mill shell 1 of the mill.

The material advances in the direction of the horizontal arrow.

The upstream surface of the frame (considered in the direction of material advancement) is provided with a large opening 11 surrounding a central opening 161 .

The downstream surface of the frame is solid except for the central opening 162.

The upstream wall of the frame has a screen 1 with openings 14
2, the aperture 14 faces the aperture 11 and allows passage of the fully ground material, leaving the grinding media and the less ground particles intact.

If a partition is placed between two grinding compartments (as in Figure 1), its downstream wall
3; if the partition were placed against the outlet end of the mill, there would be no screen 13.

Screens 12 and 13 are of wear-resistant material; they are bolted to frame 10 formed of removable sectors so that they can be easily replaced.

In the upstream wall opening 161 there is a screen 15 with holes that are sufficiently narrow to keep the grinding media intact; this grid allows the passage of draft air through the mill.

When grinding is carried out by a wet process, there is no draft and the upstream wall of the partition is centered in the middle.

The upstream and downstream walls of the frame form a small annular chamber 17 which is closed towards the center of the mill by a polygonal enclosure 20 pierced by circular openings 21 .

In the specific example shown in FIG. 1, the polygonal enclosure 20 is
The first side shown as 20a, the second side shown as 20b, 20c
The third surface shown by , the fourth surface shown by 20d, the fifth surface shown by 20e, and the sixth to eighth surfaces (not shown) form an octagon.

Each of the openings 21 is surrounded by four threaded pins 36 arranged at 90° to each other and arranged integrally with the polygonal enclosure 20 inside the polygonal enclosure 20 .

According to the invention, the chamber 17 is provided with a lift scoop 18 at right angles to each of the openings 21.

This scoop 18 extends through the opening 21; it is straight and has a semicircular cross section within the chamber 17.

At the end of the semicircular cross-section, the scoop is provided with an annular flange 181 located on and inside the polygonal enclosure 20.

The flange 181 is passed through and has 16 equally spaced holes, each fourth hole corresponding to one of the pins 36, so the flange is different on the pins. It can be installed in any angular position.

Screws 37 and washers 38 (see FIG. 2) hold flange 181 on the pin.

In this way, the scoop 18, which is fixed to the frame exclusively by the flange 181, can be arranged in four different directional positions.

Inside the polygonal enclosure 20, the scoop is cylindrical and terminates in a discharge opening with a double bevel (d
by cutting the end of the scoop in the shape of a double bevel and welding a baffle plate 182 to one edge of the bevel.

More specifically, the discharge end of the scoop is cut in two planes forming a V-shape with the top facing toward the axis of the mill, and the baffle plate 182 has two sides forming the V-shape.
Welded to one of the two sides.

A piece with holes 183 is welded to this baffle plate 182.

The mill rotates in the direction of the dashed arrow.

The annular chamber 17 constitutes a reservoir.

Material 7 from the grinding section arranged upstream of the partition enters the reservoir if the material 7 is sufficiently fine to pass through the openings 14.

While the mill is rotating, the scoop advances into the material 7 contained in the reservoir and deposits a portion of the material in the concave section formed by the semicircular cross section.

During the passage of the scoop over the axis of the mill, the material contained by the concave portion slides past the opening 21 towards the discharge orifice;
Some of the material leaving the diverter plate 182 which directs the material towards 2 may fall into the polygonal enclosure 20, but since the frame 10 forms a barrier upstream of the enclosure, rotation of the mill and the polygonal Due to the combined effect of the material gradient formed within the enclosure 20, material flows toward the central opening 162.

2A shows the position of the baffle plate 182 with the scoop in the position shown in FIG. 1; FIG. 3 shows the corresponding position of the scoop in the chamber 17.

Figures 2B, 2C, 3B and 3C show the baffle and shovel in fully closed and fully open positions, respectively.

In other words, the unit length of the scoop has the minimum and maximum lifting capacity of the material.

By the direction of placement of the scoops, their capacity for use can be adjusted and the level of material in the partitions is controlled, thus in the compartments arranged upstream of the partitions according to the control method of the above-mentioned patent no. 929,250.

For better handling, the scoop 18 may extend over only part of the length of the chamber 17; in this case a blade 39 is arranged ahead of the scoop with respect to the direction of rotation of the mill and is integral with the frame 10. extends into the scoop and conveys material toward the scoop during rotation of the mill.

Since the baffle plate 182 replaces the cone 29 and separating scoop 30 of the '250 patent, space-consuming and expensive heavy parts are eliminated, as well as reducing the weight of the steel used.

The omission of the cone greatly facilitates inspection or repair in the center of the partition: it is much easier to access the flange 181 which allows control of the shovel from inside the mill.

The hole 183 in the piece welded to the baffle plate 182 is
In order to adjust the useful volume of one of the scoops 18, it can be used when rotating it about a longitudinal axis, for example when supporting the weight of the scoop 18 by means of a pulley.

It should be noted that the flange 181 and pin 36 replace the conical seat 19, shaft 22, packing 23, bearing 24 and all the scoop subtleties of Patent No. 929,250.

The new adjustment device is simple, robust and economical for medium and small diameter mills.

Another advantage of the present invention is that it facilitates the passage of ventilation air.

In the partition according to patent no. 929250, the air passes partly through the holes 14 in the screen 12 and partly through the screen 15, but the cones limit the air passage in the screen 15 and enclosure 20 is hole 14
The surface of the passageway is reduced in the area of the opening 21 for the air leaving the partition; by this axis the total surface of the passageway available for said air is relatively limited and a large reduction in the passageway of the air within the partition is achieved. The resulting omission of the cone has the advantage of freeing the passage of air from the screen 15 and reducing the drop to normal values.

Additional relationship The present invention is disclosed in Japanese Patent No. 929250 (Japanese Patent Publication No. 53-76
In the invention of a partition in a tube grinding mill that is directly used in carrying out the invention of ``a method for controlling the amount of material in a grinding section of a tube mill'' as set forth in claim 1 of Patent No. 53), Therefore, as stipulated in Article 31, Item 3 of the Patent Law,
It satisfies additional patent requirements.

[Brief explanation of drawings]

1 is a vertical section through a partition forming the object of the invention at an intermediate position in a mill with two compartments; FIG. FIG. 1A is a detailed perspective view of one scoop. FIG. 2A is an enlarged view along line 1-H in FIG. Figures 2B and 2C are similar views showing other positions of the shovel. FIG. 3A is a cross-sectional view taken along line -m in FIG. 1. Figures 3B and 3C are Figures 2B and 2C, respectively.
A similar view in the location shown. 10...Frame, 11...Opening, 1
2... Screen, 13... Screen, 14... Opening, 17... Annular chamber,
18... Scoop, 181... Annular flange, 182... Deflector plate, 20...
・Polygon enclosure, 36...Pin, 39...
·blade.

Claims (1)

Claims: 1. In a partition in a tube grinding mill with grinding media, an upstream wall with calibrated openings and a downstream wall forming a disk of solid material and with a central discharge opening. a wall, wherein the upstream wall and the downstream wall are such that the material is conveyed above the axis of the mill by rotation of the mill and is discharged onto a baffle member where the material is directed toward a discharge opening. forming a reservoir for the material and further extending into the reservoir for modifying the level of the material in the reservoir and for modifying the level of the material in the reservoir; Control means are also provided consisting of a scoop, the useful volume of which is adjustable, the baffle member being constituted by the scoop itself, and the scoop extending from the reservoir into the opening formed in the polygonal enclosure. A partition extending inside the polygonal enclosure through the partition. 2. The partition according to claim 1, wherein the baffle plate member is constituted by the discharge end of the scoop. 3. The discharge end of the shovel extending into the polygonal enclosure is cylindrical and has a shape cut by two planes forming a V with the top pointing towards the axis of the mill; 3. A partition as claimed in claim 2, in which a baffle plate is fixed to one of the two planes forming the V to direct the material towards the central discharge opening. 4. Each of the scoops, as well as around each of the corresponding openings formed in the polygonal enclosure, expands the useful volume of the scoop by rotating the scoop about the longitudinal force axis of the scoop. A partition according to claim 1, comprising cooperating means for changing. 5. said cooperating means comprising, for each of said scoops, a multi-hole annular flange integral with said scoop and a nut fixed around a corresponding opening in said polygonal enclosure and comprising a threaded pin; Constituent Claim No. 4
Dividers listed in section. 6 the annular flange having 16 equally spaced holes, each of 4 of the holes having a nut integral with the polygonal enclosure and extending around each of the openings in the enclosure; one of the threaded pins arranged at 90° with respect to each other, the flange and therefore the scoop can be moved onto the enclosure in different angular positions for the purpose of modifying the level of material in the reservoir. The partition according to claim 5, which can be installed in. 7. A partition according to claim 1, wherein the scoop extends beyond only a portion of the annular chamber and is disposed around the periphery of the chamber, with blades integral with the frame of the partition conveying material towards the scoop.