JPH0437631Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a vertical pulverizer that pulverizes raw materials for cement, coal, chemicals, etc. through the cooperation of a rotating table and pulverizing rollers.

[Prior Art] Vertical pulverizers equipped with a rotary table and rollers are widely used as a type of pulverizer for finely pulverizing powders such as cement raw materials, coal, and chemicals. This type of crusher consists of a disk-shaped rotary table that is driven by a motor with a reducer to rotate at low speed in the lower part of a cylindrical casing, and a part that divides the outer circumference of the upper surface into equal parts in the circumferential direction, which is pressed by hydraulic pressure or the like. It is equipped with a plurality of rollers that are driven to rotate.

In this vertical crusher, powder as a raw material is supplied to the center of the rotary table through a supply pipe, and when the table rotates, it receives centrifugal force in the radial direction of the table and slides on the table. Under the force, it slips between it and the table and rotates a little slower than the table rotation speed. The above two forces, that is, the forces in the radial direction and the force in the rotational direction are combined, and the powder moves to the outer periphery of the rotary table while drawing a spiral trajectory on the table. Since the roller is in pressure contact with this outer periphery and is rotating, the particles with spiral lines enter between the roller and the rotary table from a direction forming a certain angle with the roller axis direction and are bitten. Shattered.

On the other hand, hot air is guided to the base of the casing by a duct, and the fine powder is dried by blowing up the hot air from the annular space between the outer circumferential surface of the rotary table and the inner circumferential surface of the casing. It rises inside the casing, and is discharged from the outlet as a mixture with hot air and sent to the next process. In addition,
In this annular space, a blade ring is usually arranged, which includes an inner ring, an outer ring, and a large number of plate-shaped blades arranged between these rings.

By the way, it is rare for the material to be crushed supplied to the crusher to be crushed into the fine powder particle size required by this crusher by being subjected to the crushing action by the crushing rollers only once, and the material may fall to the center of the rotary table. Not all of the crushed material is bitten by the crushing rollers, so even if the powder and granules that reach the outer peripheral edge of the rotary table rise up on the hot air current blowing up from the annular space, they will not be able to be crushed by the crusher. By the time the particles reach the separator installed at the top, depending on their particle size, they may fall or be classified and removed by the separator and returned to the rotary table.

In this way, the material to be crushed, which is constantly fed into the crusher, rises from the rotary table to the separator or passes through the rotary table until it reaches the desired fine powder particle size to become the final product and flows out of the crusher. The powder is gradually crushed by falling from the middle of the separator many times until it reaches the desired particle size. In addition,
Among the raw materials that have reached the edge of the table, those with a large diameter are not carried by the air current and fall downward through the annular space. (This falling material is usually referred to as stone waste.) [Problems to be solved by the invention] In such conventional vertical crushers, the amount of stone waste increases due to various reasons, and the amount of stone waste increases due to various reasons. Efficiency sometimes decreased.

For example, if the particle size or specific gravity of the raw material increases, the amount of waste rock increases. Further, when the wear of the rollers progresses, the amount of stone discharged increases.

Conventionally, when the amount of discharged stone increases, the speed of hot air blowing has been increased by inserting a spacer in the blade ring. This reduces the operating rate of the crusher. Replacing the blade ring itself has also been practiced in recent years, but there are similar problems.

In addition, the blade ring is designed to increase the hot air blowing speed, but this increases the hot air blowing speed more than necessary, resulting in an increase in the running cost of the device.

[Means for Solving the Problems] The present invention includes a rotary table in a casing and a plurality of crushing rollers arranged on the rotary table, and an inner ring and an outer ring on the side of the table. In a vertical crusher equipped with a blade ring for blowing up hot air comprising rings and plate-shaped blades arranged between these rings, the outer ring is divided into a plurality of pieces in the circumferential direction of the ring. The lower end side of each divided body is pivotally supported by the casing so that the upper end side thereof can be tilted toward the inner circumferential ring, and the upper side of the divided body of the outer circumferential ring has a A hot air guiding armor ring is fixed to direct the hot air blowing up between the ring and the inner ring inward, and an operating piece for rotating each divided body is connected to each divided body. , a vertical crusher characterized in that one end of the operating piece extends outside the casing;
The main points are as follows.

[Function] In the present invention, the hot air blowing speed of the blade ring can be changed in accordance with the stone discharge state of the crusher, and the hot air blowing direction can be directed inward by the armor ring. Therefore, the amount of stone discharged is reduced and the crushing efficiency is improved. In this case, the hot air speed can be adjusted to an appropriate speed, and an increase in running costs due to excessive air speed can be prevented. Further, since the opening degree of the blade ring can be changed while the crusher continues to operate, the operating rate does not decrease.

In the present invention, at least one of the inner circumferential ring and the outer circumferential ring constituting the blade ring is constituted by a divided body divided into a plurality of pieces in the circumferential direction.
By tilting this divided body, the distance between the inner circumferential ring and the outer circumferential ring is adjusted, and the amount of hot air blown up passing through the blade ring is adjusted.

Therefore, the amount of hot air blowing up can be adjusted partially around the rotary table.

Further, when adjusting the interval between the inner circumferential ring and the outer circumferential ring of the blade ring by tilting the divided body in this manner, the hot air passage cross-sectional area gradually changes in the hot air blowing direction. Therefore, the pressure loss when hot air passes through the blade ring is reduced. Furthermore, since the flow of hot air after passing through the blade ring is not disturbed, it is easy to guide the hot air after passing through the blade ring toward the center of the rotary table.

[Example] FIG. 1 is a longitudinal sectional view showing an example of a vertical crusher according to the present invention. The crusher 1 includes a casing 20 that houses the entire crushing section such as a rotary table 3, which will be described later. a middle casing 20b having an internal cone 20c with a circular cross section;
It has an upper casing 20d joined to its upper end.

A reducer 2 with a motor is disposed in the center of the lower casing 20a, and a rotary table 3 formed in a disc shape is attached to the output shaft facing upward. It is driven and rotates clockwise when viewed from above in FIG. Reference numeral 5 denotes a plurality of roller boss arms, and a plurality of roller boss arms are arranged at the upper outer circumferential end of the rotary table 3, and a truncated conical crushing roller 4, which is pivoted in a substantially horizontal position, is pivotally connected to the lower end of each roller boss arm. There is.

A pressure frame 6 having an annular shape (an annular shape in this embodiment) is fixed to the upper surface of the upper inner peripheral end of the roller boss arm 5 by means such as bolt tightening, and a plurality of crushing rollers 4 and a roller The boss arm 5 and the pressure frame 6 are integrally formed and mounted on the upper surface of the rotary table 3. On the other hand, the upper outer peripheral end of each roller boss 5 is connected to a pin 7 and a fork end 7.
The connecting rod 8 and turnbuckle 9 are rotatably connected by a.
The lower end of the hydraulic cylinder 10 is connected to a base plate 13 through a rotation 11 and a rotation seat 12.

Each crushing roller 4 is rotatably supported on a roller boss 5 via a roller shaft 4a, and its peripheral surface is in contact with the outer peripheral surface of the upper end of the rotary table 3, so that it is driven as the rotary table rotates. It is rotatable.

On the other hand, above the center of the rotary table 3, a raw material supply pipe 16 is vertically disposed, supported by an upper casing 20d via a final refined powder discharge pipe 22, and around this raw material supply pipe 16. A separator 15 formed of an inverted conical cylinder is supported on the middle casing 20b by a stay (not shown). A plurality of movable vanes 15a are arranged evenly in the circumferential direction on the outer circumferential upper surface of the upper end of this separator 15 for applying swirling force to the inflowing dust gas, and a shaft 15b and a handle are supported at one end by a bearing 15c. 15d, it can be rotated and adjusted from the outside.

Furthermore, an annular hot air passage 21 is provided below the outer periphery of the rotary table 3 and is connected to a hot air generator through a duct 18.
At the bottom, there is a discharge chute 19 that temporarily discharges foreign matter during crushing or excess crushed materials in the event of overload.
is installed and can be taken out from a discharge door 19b which is rotatable around a rotation pin 19a. Above this hot air passage 21, an inner circumferential ring 14a, an outer circumferential ring 14b, and a plate-shaped blade 14 are arranged in an annular space between the rotary table 3 and the casing 20a.
A blade ring 14 with c is installed.

In this embodiment, the outer ring 14b is divided into eight equal parts in the inner circumferential direction, and the upper side of each divided body 14B rotates in the radial direction of the table 3 to increase the distance between the inner ring 14a and the outer ring 14b. It is configured so that it can be adjusted. That is, as shown in FIG. 2, the lower part of the outer peripheral surface of each divided body 14B is pivotally supported by the casing 20a via the link 30. Each divided body 1
One end of a rod 31 serving as an operating piece for tilting the divided body 14B is pivotally attached to the upper outer periphery of the split body 4B via a pivot member 32. This rod 3
The other end of the rod 1 passes through the casing 20a, and a stopper 33 is provided in this penetrating portion to lock the rod 31 at a desired position. A scale plate 34 is fixed to the outer wall of the casing 20a, and an indicator 35 for reading the scale of the scale plate 34 is attached to the rod 31.

The plate-shaped blade 14c has this outer circumferential ring 14b.
A large number of plates are disposed at predetermined intervals so as to extend between the inner circumferential ring 14a and the inner circumferential ring 14a. This plate-shaped blade 14c has a required angle of inclination with respect to the horizontal plane, and serves to swirl the hot air passing through the blade ring 14 in the circumferential direction of the table 3.

In this embodiment, these plate-shaped blades 14c are divided into an inner half body _c1 and an outer half body _c2 , and the half body _c2 is fixed to the outer ring 14b.
Further, the half body _c1 is fixed to the inner ring 14a, and its lower end is fixed to a bracket 36 installed inside the casing 20a, and the inner ring 14a is fixed to the inner ring 14a through the half body _c1 . It is configured to be supported by the casing 20a. In addition, each half body c ₁ ,
c ₂ has their opposing sides overlapped, and when the outer circumferential ring 14b rotates, the overlapped portions slide.

Reference numeral 37 is an armor ring fixed to the upper end surface of the outer ring 14b. This armor ring 37 has a bent cross-sectional shape that projects toward the center of the table 3, and functions to narrow the hot air that has passed through the blade ring 14 toward the center of the table 3.

In the pulverizer having such a configuration, when the particles that are caught between the rollers 4 and the table 3 and are pulverized or the particles that have passed between the rollers 4 reach the edge of the table 3, they pass through the blade ring 14. They are blown upward by the hot air that blows up. At this time, by moving the rod 31 back and forth and rotating the outer ring 14b, the distance between the inner ring 14a and the outer ring 14b of the blade ring 14 can be reduced. You can adjust and change the hot air blowing speed. Therefore, even if the specific gravity and particle size of the particles that reach the edge of the table 3 change due to changes in the particle size and specific gravity of the raw material, wear of the rollers, etc., the hot air blowing speed is changed accordingly, and the stone removal Outer ring 14b that can reduce the amount of hot air and prevent excessive hot air blowing speed.
can also be adjusted. Also, when making such adjustments, there is no need to stop the mill. In this way, it is possible to continue stable operation with less stone discharge while avoiding excessive wind speed.

In this embodiment, as shown in FIG. 3, eight divided bodies 14B of the outer circumferential ring 14b are arranged, and four
For each roller 4, the joint portion of each divided body 14B is behind the roller boss 5 and at an intermediate point between each roller 4. Therefore, the rotation angle of the divided body 14B can be set so that the hot air blowing up speed from the blade ring 14 is different between the biting side and the sending side of each roller 4. Therefore, for example, on the roller biting side where a large amount of relatively large particles reach the edge of the table 3, the hot air blowing speed is increased, and a relatively small amount of relatively small particles reach the edge of the table 3. The hot air blowing speed can be adjusted to be smaller on the roller delivery side, which enables even more efficient pulverizer operation.

Of course, it is also possible to adjust the rotation angle of each divided body 14B to be different for each roller depending on, for example, the wear condition of the rollers.

In this embodiment, the lower side of the divided body 14B constituting the outer ring 14b is pivotally supported by the link 30, and the divided body 1
The upper side of 4B can be tilted toward the inner ring 14a. If the upper side of the divided body 14B is tilted toward the inner ring 14a in order to reduce the amount of hot air blown up, the cross-sectional area of the hot air passage in the blade ring 14 gradually becomes narrower as it moves upward. In other words, the hot air passage cross-sectional area does not change rapidly. Therefore, the pressure loss of the hot air passing through the blade ring 14 is small.

In addition, in this embodiment, an armor ring 37 is provided, and the hot air blown up is directed inward, so that the amount of stone discharged can be further reduced. In addition, since the scale plate 34 is provided, the outer ring 1
4b (divided body 14B) can be accurately detected.

In the above embodiment, the outer ring 14b is movable and the inner ring 14a is fixed, but in the present invention, the inner ring 14a may be movable, or both the inner ring 14a and the outer ring 14b may be movable. It's good as well. Furthermore, when dividing the outer circumferential ring 14b, etc., the number of divided bodies is not limited to what is shown in the drawings, and can be changed as appropriate depending on the capacity of the crusher and the like.

Further, in the present invention, the outer ring 14b and the like may be rotated using an appropriate actuator such as a hydraulic cylinder or a screw shaft driven by a motor.

In the illustrated embodiment, a pressure frame 6 is used to
Although the rollers are integrally supported in the present invention, various embodiments may be adopted without departing from the spirit of the present invention, such as supporting each roller separately.

[Effects of the invention] As described above, according to the vertical crusher of the invention, when the rollers wear out, the raw material changes (for example, changes in particle size composition, moisture, viscosity, etc.), or the product particle size changes. Even in this case, the amount of stone discharged from the crusher does not increase, and an excessive hot air blowing speed can be avoided.

In the present invention, at least one of the inner circumferential ring and the outer circumferential ring constituting the blade ring is divided in the circumferential direction to form a divided body, and the divided body is tilted to vary the passage cross-sectional area of the blade ring. Therefore, the hot air blowing speed can be adjusted partially around the rotary table. In addition, the pressure loss of hot air when passing through the blade ring is small.

Furthermore, the hot air blowing speed can be adjusted while the crusher continues to operate, improving operating efficiency. Therefore, according to the present invention, stable operation can be realized and the power cost of the fan etc. can be reduced.

[Brief explanation of drawings]

Figure 1 is a longitudinal sectional view showing the configuration of a vertical crusher, Figure 2 is an enlarged view of the main parts, Figure 3 is a sectional view taken along the line of Figure 1, and Figure 4 is an enlarged view of the main parts of Figure 3. It is. 1... Vertical crusher, 3... Rotating table, 4...
...Crushing roller, 6...Pressure frame, 14...Blade ring, 14a...Inner ring, 14b...Outer ring,
14c...Plate blade, 31...Rod, 37
...Armor ring.

Claims (1)

[Claims for Utility Model Registration] A rotary table is provided in the casing, and a plurality of crushing rollers are placed on the rotary table, and on the side periphery of the table there is an inner ring, an outer ring, and a ring between these rings. In a vertical crusher equipped with a blade ring for blowing up hot air, the outer ring is divided into a plurality of pieces in the circumferential direction of the ring. The lower end side of the divided body is pivotally supported by the casing so that the upper end side thereof can be tilted toward the inner circumferential ring, and the outer circumferential ring and the inner circumferential ring are arranged above the divided body of the outer circumferential ring. A hot air guiding armor ring for directing the direction of hot air blown up between the parts is fixed to the inside, and an operating piece for rotating each divided body is connected to each divided body, and one end of the operating piece A vertical crusher, characterized in that the symbol extends outside the casing.