JPH0131423B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reversible rod mill.
Rod mills generally use rods as the grinding medium and are widely used as a typical intermediate grinder. Rod mills are characterized by uniform particle size and little generation of fine powder. The particle size of the processed material to be ground in a rod mill can be adjusted by adjusting the amount of raw material supplied, the number of revolutions, the amount of rod filling, etc., but when it is necessary to make the particle size even finer, side discharge type rod mills can be operated in batch mode. , must be crushed repeatedly. Grinding repeatedly in this way,
That is, repeatedly supplying the pulverized material discharged from the mill to the mill for pulverization not only requires transportation and supply means, but also complicates the work and requires a lot of labor and operation time. Furthermore, it is difficult to set the grinding conditions to obtain the desired particle size. It is possible to open and close the discharge port freely and open it when the desired particle size is reached, but this would complicate the opening/closing device and
Pulverized products with uniform particle size cannot be obtained.

The object of the present invention is to be able to continuously grind the processed material as a normal rod mill, and also to be able to grind the processed material into a fine desired particle size by simple batch operation, with less labor and time, and with high accuracy. There is a rotund mill to offer.

The reversible rod mill of the present invention includes a body portion including a horizontally cylindrical crushing chamber whose one end is inclined to be higher than the other end, an outer cylinder chamber surrounding the outer periphery of the crushing chamber, and one end of the body portion. and a circulation chamber and a discharge chamber partitioned by the other end, a head plate, and an end plate, respectively, and the raw material supply means opens the upper side in the circulation chamber, penetrates the head plate, enters the grinding chamber, and passes through the end plate. A communication hole is drilled in the peripheral surface of the grinding chamber adjacent to the outer cylinder chamber, and a feed blade is provided in the outer cylinder chamber to transfer the processed material to the circulation chamber side by forward rotation and to the discharge chamber side by reverse rotation. A communication hole is provided in the head plate and end plate between the circulation chamber and the discharge chamber, respectively.
A discharge port is provided on the circumferential surface of the discharge chamber, and radial raking blades are provided in the circulation chamber, and the material to be treated is lifted up by the raking blades and falls onto the raw material supply means. It is.

Hereinafter, the reversible rod mill of the present invention will be described in detail based on drawings of embodiments. FIG. 1 is a longitudinal sectional view of an embodiment of the rod mill of the present invention, and FIG. 2 is a sectional view taken along the - line in FIG. The illustrations and descriptions of those naturally provided in the rod mill, such as the drive device, will be omitted.

This reversible rod mill is a horizontally mounted mill that is tilted so that one end (the left end in Figure 1) that is the raw material supply side is higher than the other end (the right end in Figure 1) that is the discharge side of the processed material. A body part 1 consisting of a cylindrical crushing chamber 2 and an outer cylindrical chamber 3 surrounding the outer periphery of the crushing chamber 2; one end and the other end of the body part 1 are partitioned by a head plate 4 and an end plate 5, respectively. It includes a circulation chamber 6 and a discharge chamber 7. A screw feeder 8 serving as a raw material supplying means has its upper side opened in the circulation chamber 6, passes through the head plate 4, and extends into the grinding chamber 2. The head plate 4 has an opening in the center to allow the screw feeder 8 to enter, and the center of the head plate 4 and end plate 5 to allow air to circulate.

The processed material is supplied from the supply port 8A as shown by the arrow, and sent into the crushing chamber 2 by the feeder 8. Furthermore, since the feeder 8 is open at the top within the circulation chamber 6, the processed material falling from above is also fed into the crushing chamber 2 as described later. A hollow portion is formed above the feeder 8, and the hollow portion extends further from the upper end of the feeder 8 to become a hollow pipe 8B, and the hollow pipe 8B is connected to suction means. Therefore, by operating the suction means, the air flows as shown by the white arrow, and the dust generated due to the crushing action is removed.

The crushing chamber 2 is filled with rods 9 of crushing media, and a plurality of communication holes 10 are bored in the circumferential surface adjacent to the end plate 5 in a manner arranged in the circumferential direction.
Therefore, the crushing chamber 2 communicates with the outer cylinder chamber 3 through the communication hole 10.

A feeding blade 11 is provided within the outer cylinder chamber 3. The material to be processed in the outer cylinder chamber 3 is transported by the feed blade 11.
When the mill is rotating in the forward direction, it is transferred to the circulation chamber 6 side, and when it is rotating in the reverse direction, it is transferred to the discharge chamber 7 side. A plurality of communication holes 1 are provided in the head plate 4 and end plate 5 between the outer cylinder chamber 3 and the circulation chamber 6 and discharge chamber 7, respectively.
2 and 13 are provided. The transfer direction of the processed material in the outer cylinder chamber 3 may be reversed. However, in this case, it is necessary to adjust the opening of the raking blade 16, which will be described later.

The discharge chamber 7 is provided with a plurality of discharge ports 14 arranged circumferentially on the circumferential surface thereof. An annular groove body 1 which is close to the outside of the discharge chamber 7 and surrounds the discharge port 14 and has a U-shaped cross section.
5 is fixedly provided as a separate body from the rotary cylinder body, and a discharge port 15A is provided at the lower part of the annular groove body 15.

The circulation chamber 6 is made up of an inner cylindrical portion 6A into which the screw feeder 8 enters, and which forms an air passageway with the screw feeder 8 as tightly as possible, and an outer cylindrical portion 6B outside the inner cylindrical portion 6A. are separated by a cylindrical wall with an opening 17. As shown in FIG. 2, radial scraping blades 16 are provided in the outer cylinder chamber 6B. Therefore, the processed material sent from the outer cylindrical chamber 3 through the communication hole 12 to the circulation chamber 6 (outer cylindrical portion 6B) is lifted up by the raking blades 16. An opening 17 is provided so that when the mill rotates in the forward direction as shown by the arrow in FIG. . The position of the opening 17 is adjusted when the object to be processed is transferred by the rake blade 16 in reverse rotation, or when it is desired to transfer the object to be processed in both forward and reverse rotations. 18 is a drive gear.

Next, the operation of this reversible rod mill will be explained. When the required amount of the processed material is supplied from the supply port 8A, the processed material is fed into the grinding chamber 2 by the screw feeder 8, progresses to the end plate 5 side while being ground in the grinding chamber 2, and is passed through the communication hole 10. Enter the outer cylinder chamber 3. The processed material is sent to the feed blade 11 in the outer cylinder chamber 3.
is transferred to the circulation chamber 6 side through the communication hole 12, enters the outer cylinder chamber 6B of the circulation chamber 6, is lifted by the scraping blade 16, passes through the opening 17, passes through the inner cylinder part 6A, and is transferred to the screw feeder 8. It falls into the upper opening, is transferred by the feeder 8, and is circulated inside the grinding chamber. The processed material is gradually pulverized into finer particles while the circulation is repeated in this manner. Whether or not the desired particle size has been achieved can be estimated based on the setting conditions, but if necessary, by rotating the mill in reverse for a short period of time, a portion of the processed material can be taken out from the discharge port 15A and checked. .

When the processed material reaches the desired degree of grinding, the mill is rotated in reverse. The processed material in the outer cylinder chamber 3 and the processed material advancing from the crushing chamber 2 into the outer cylinder chamber 3 are sent to the discharge chamber 7 side by the sending blade 11 in the opposite direction to the previous direction, and are sent to the discharge chamber 7 side through the communication hole 1.
3. It passes through the discharge chamber 7, the discharge port 14, and the annular groove body 15, and is taken out from the discharge port 15A. The processed material remaining in the circulation chamber 6 is also sent to the crushing chamber 2 and taken out in the same manner. Dust is discharged from the hollow tube 8B by suction means. By optimizing the suction force of the suction means, the material to be treated can also be separated.

For example, a fixed amount of steelmaking slag with a diameter of 25 mm or less is supplied to the material to be treated, the material is circulated repeatedly in batch operation, the slag is finely pulverized, and the light pulverized slag is mostly mixed with air by suction means into the hollow tube 8B. If the mill is reversed once it has been discharged from the
Almost only the metal can be taken out from the discharge port 15A.

Since the reversible rod mill according to the present invention is constructed and operates as described above, it can produce the following excellent effects. That is, the reversible rod mill of the present invention can continuously grind the processed material as a normal rod mill, and can also grind the processed material to a fine desired particle size by simple batch operation. Moreover, the labor and time for this are small, and the particle size distribution of the obtained pulverized product is narrow. In addition, such as separation of steelmaking slag and base metal,
By passing an air flow through the mill by suction means, the fine light weight slag is discharged by the air flow,
The separation effect can be improved by taking out the metal from the outlet of the mill. Therefore, it has great industrial utility value.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of an embodiment of the reversible rod mill of the present invention, and FIG. 2 is a sectional view taken along the - line in FIG. 1...Body part, 2...Crushing chamber, 3...Outer cylinder chamber,
4... Head plate, 5... End plate,
6... Circulation chamber, 7... Discharge chamber, 8... Screw feeder (raw material supply means), 9... Rod, 10,
12, 13...Communication hole, 11...Feeding blade, 14
...Discharge port, 16...raking blade.

Claims (1)

[Claims] 1. A body section consisting of a horizontal cylindrical crushing chamber whose one end is inclined to be higher than the other end, and an outer cylindrical chamber surrounding the outer periphery of the crushing chamber, and one end and the other end of the body and the head. It has a circulation chamber and a discharge chamber partitioned by a plate and an end plate, respectively, and the raw material supply means opens the upper side in the circulation chamber, penetrates the head plate and enters the grinding chamber, and supplies the material around the grinding chamber near the end plate. A communication hole is drilled on the surface,
In the outer cylinder chamber, the processed material is transferred to the circulation chamber side by forward rotation.
Feed blades are provided to transfer the fluid to the discharge chamber by reverse rotation, communication holes are provided in the head plate and end plate between the outer cylinder chamber, the circulation chamber, and the discharge chamber, and the discharge chamber is provided on the circumferential surface of the discharge chamber. 1. A reversible rod mill, characterized in that an outlet is provided, and radial scraping blades are provided in the circulation chamber, and the scraping blade lifts the processed material and drops it onto the raw material supply means.