CN203196692U - Vertical roll mill - Google Patents

Abstract

The utility model provides a vertical roll mill. According to the vertical roll mill, the reliability of the mill can not be damaged even under the large-scale condition of the mills, and the increase of the manufacturing cost can be limited. The vertical roll mill (1) comprises a rotary platform (2), a crushing roll (3), and a recycling bin (21), wherein crushed materials are supplied on the upper surface of the rotary platform (2); the crushed materials are clamped between the crushing roll (3) and the rotary platform (2) so as to be crushed; the recycling bin (21) is used for recovering the crushed materials which are discharged around the rotating platform (21) along with the rotating of the rotary platform (2). A plurality of inclined planes (22) form the bottom surface of the recycling bin (21) and are inclined with an angle greater than the repose angle of the crushed materials in the recycling bin (21).

Description

vertical roller mill

technical field

The utility model relates to a vertical roller mill for crushing objects to be crushed between a plurality of crushing rollers and a rotary table.

Background technique

Conventionally, a vertical roller mill that bites and pulverizes a material to be ground between a plurality of grinding rollers and a rotary table is used for producing cement aggregates and the like (Patent Document 1).

In the conventional vertical roller mill, the large-diameter raw material (to-be-ground material) pulverized between the pulverizing roller and the rotary table is discharged around the rotary table by the centrifugal force generated by the rotation of the rotary table.

The large-diameter raw material discharged from the turntable falls into a recovery box for raw material recovery provided along the outer side of the turntable. The bottom surface of the conventional recovery box is formed of an annular horizontal surface, and the fallen large-diameter raw materials are accumulated on the horizontal bottom surface of the recovery box.

A scraper for collecting raw materials is provided inside the recovery box, and the scraper is mounted on the rotary table and rotates integrally with the mounting table.

A discharge port for discharging raw materials from the recovery tank is formed on the bottom surface of the recovery tank. The scraper rotating together with the rotary table collects the raw materials while moving on the bottom surface of the recovery box, and drops the raw materials into the discharge port.

The raw materials collected by the scraper and discharged from the outlet are transported by a conveyor such as a bucket elevator, and returned to the rotary table to be crushed again.

[Background Art Document]

[Patent Document]

[Patent Document 1] Japanese Patent Laid-Open No. 2001-340779

Utility model content

[Problems to be solved by the utility model]

In recent years, in order to increase the processing capacity of vertical roller mills, the size of the equipment has been continuously increased.

However, if the rotary table of the vertical roller mill is enlarged, its peripheral speed will increase, and the moving speed of the scraper will also increase accordingly. Therefore, when the scraper moves on the bottom surface of the recovery box, the scraper is worn or the impact force is strong due to the contact with the raw material.

Therefore, in order to prevent the reliability of the grinding machine from being lowered, it is necessary to further strengthen the wear countermeasures and the impact countermeasures compared with the conventional ones, which has a problem of increasing the manufacturing cost.

The present invention is made in view of the problems of the prior art described above, and its object is to provide an instant grinding machine that does not impair the reliability of the grinding machine and can suppress an increase in manufacturing cost even when the grinding machine is enlarged. roller mill.

[Technical means to solve the problem]

In order to solve the above-mentioned problems, the vertical roller mill of the present invention is characterized in that it includes: a rotary table on which the object to be pulverized is supplied; The pulverized objects are pulverized; and a collection box recovers the pulverized objects discharged around the rotary table along with the rotation of the rotary table; and, the bottom surface of the collection box is formed of a plurality of inclined surfaces, The inclination is at an angle larger than the angle of repose of the crushed material recovered in the recovery box.

Furthermore, it is preferable to further include a discharge port formed in the concave portion of the bottom surface including the plurality of inclined surfaces.

Furthermore, it is preferable that the pulverizing roller is disposed at a position corresponding to a convex portion of the bottom surface including the plurality of inclined surfaces.

And, it is preferable that the vertical roller mill includes a plurality of discharge chute (discharge chute), which is arranged below a plurality of the discharge ports; The pulverized objects are discharged; and at least two of the plurality of discharge troughs discharge the pulverized objects to the common conveyor.

Moreover, it is preferable that the vertical roller mill further includes: a speed reducer for transmitting driving force to the rotary table; and a connecting shaft including an upper end connected to the center of the lower surface of the rotary table And the lower end connected with the reducer.

Moreover, it is preferable that the vertical roller mill further includes a maintenance passage, which is for the speed reducer to pass through and pull out, and the maintenance passage is provided under the connection part, and the connection part will be provided at The upper ends of the two stand parts on both sides of the maintenance passage are connected to each other.

[effect of utility model]

According to the vertical roller mill of the present invention, since the bottom surface of the recovery box is formed by using a plurality of inclined surfaces inclined at an angle larger than the angle of repose of the crushed objects recovered in the recovery box, there is no need to recover the crushed objects. Even when the size of the grinder is increased, the reliability of the grinder is not impaired, and an increase in manufacturing cost can be suppressed.

Description of drawings

FIG. 1 is a schematic longitudinal sectional view showing a vertical roller mill according to an embodiment of the present invention.

Fig. 2 is a sectional view taken along line II-II of Fig. 1 .

Fig. 3 is a cross-sectional view along line III-III of Fig. 1 .

Fig. 4 is a sectional view taken along line IV-IV of Fig. 2 .

Fig. 5 is a sectional view taken along line V-V of Fig. 2 .

[explanation of the symbol]

1 vertical roller mill

2 rotating table

3 Crushing rollers

4 roller pushing mechanism

5 Arm 1

6 2nd arm

7 push drive unit

8 Push the drive shaft of the drive unit

9 Grinder setting surface

10 Rotary drive source

11 reducer

12 horizontal link axis

13 vertical link shaft

14 Grinder cover

15 raw material supply tank

16 hot air pipe

17 separator

18 fine powder discharge pipe

19 maintenance access

20 Support part

20A stand

20B link

21 recycling bins

22 Inclined surface

23 Convex

24 concave

25 outlet

26 discharge chute

27 Conveyor

28 Separator drive

Detailed ways

Hereinafter, a vertical roller mill according to an embodiment of the present invention will be described with reference to FIGS. 1 to 5 .

As shown in FIGS. 1 and 2 , a vertical roller mill 1 according to the present embodiment includes a rotary table 2 on which a raw material (material to be ground) is supplied to the upper surface. Six crushing rollers 3 are installed around the turntable 2, and these crushing rollers 3 bite into the object to be crushed between the turntable 2 and the turntable 2, and crush it. The six crushing rollers 3 are arranged at equal angular intervals (60° intervals) on an imaginary circle centered on the rotation axis of the turntable 2 .

The crushing roller 3 is pushed onto the turntable 2 by the roller pressing mechanism 4 . The roller pressing mechanism 4 includes a first arm 5 provided with a crushing roller 3 at a front end thereof, and a second arm 6 having a front end connected to a base end of the first arm 5 . To the base end of the second arm 6 is connected the front end of a drive shaft (for example, a cylinder pin) 8 of a push drive unit (for example, a hydraulic cylinder) 7 .

In the roller pressing mechanism 4 , the drive shaft 8 of the pressing drive unit 7 is pulled in to press the crushing roller 3 against the turntable 2 via the first arm 5 and the second arm 6 .

As shown in FIGS. 1 and 3 , a rotational drive source 10 and a speed reducer 11 of the turntable 2 are installed on the grinder installation surface 9 , and the rotational drive source 10 and the speed reducer 11 are connected by a horizontal connection shaft 12 . Furthermore, the speed reducer 11 and the turntable 2 are connected by a vertical connection shaft 13 .

That is, the reducer 11 and the turntable 2 are not directly connected to each other, but are connected via a vertical connection shaft 13 including an upper end connected to the center of the lower surface of the turntable 2 and a lower end connected to the reducer 11. .

The rotary table 2 and the crushing roller 3 are covered by a grinder cover 14 . The raw material (to-be-ground material) is supplied to the rotary table 2 via the raw material supply tank 15 arrange|positioned through the grinder housing 14. As shown in FIG.

A hot-air pipe 16 is connected to a lower side surface of the grinder cover 14 , and hot air is supplied to the inside of the grinder cover 14 through the hot-air pipe 16 . A separator 17 is provided above the turntable 2 . The pulverized raw material is blown by the hot air supplied to the lower part of the grinder housing 14 through the hot air pipe 16 , and transferred to the separator 17 .

The separator 17 is rotationally driven by a separator driving device 28 including a motor, and only the raw materials (fine powder) finer than a specific particle size (particle diameter) among the pulverized raw materials are separated from the upper part of the grinder cover 14. Fine powder discharge pipe 18 discharges. On the other hand, the raw material (coarse powder) coarser than a specific particle size (particle diameter) is separated by the separator 17, returned to the rotary table 2, and pulverized again.

A maintenance passage 19 is formed below the grinder cover 14 , and the maintenance passage 19 is used for the speed reducer 11 to pass under the crushing roller 3 and its pressing mechanism 4 to be pulled out. More specifically, the maintenance passage 19 is formed to penetrate through the cement support portion 20 of the support roller pressing mechanism 4 or the like.

That is, the cement-made support part 20 includes: two stand parts 20A, which are provided on both sides of the maintenance passage with the maintenance passage 19 in between; and a connecting part 20B, which connects the upper ends of the two stand parts 20A. and form the top plate portion of the maintenance passage 19. According to this configuration, even if the number of crushing rollers 3 and their pressing mechanisms 4 increases, maintenance access can be ensured.

In addition, the vertical roller mill 1 of the present embodiment includes a recovery box 21 for recovering raw materials discharged around the turntable 2 by the centrifugal force accompanying the rotation of the turntable 2 . The recovery box 21 has a larger diameter than the turntable 2 and is formed in a ring shape as a whole.

As shown in FIGS. 4 and 5 , the bottom surface of the recovery box 21 is formed by a plurality of inclined surfaces 22 . Each inclined surface 22 is inclined at an angle larger than the angle of repose of the raw material collected into the recovery box 21 . In this way, since each inclined surface 22 forming the bottom of recovery box 21 is inclined at an angle larger than the angle of repose of the raw material, the raw material recovered in recovery box 21 does not stagnate on the bottom of recovery box 21 .

In this example, the 12 inclined surfaces 22 are juxtaposed so as to alternately incline in opposite directions along the circumferential direction, and their upper end portions and lower end portions are connected together. That is, the convex part 23 is formed by the two upper end parts of the adjacent inclined surface 22, and the recessed part 24 is formed by the two lower end parts of the adjacent inclined surface 22.

Each crushing roller 3 is arranged at a position corresponding to the six protrusions 23 formed on the bottom surface of the recovery box 21 . By arranging the pulverizing roller 3 in this way, the pulverizing roller 3 and its pressing mechanism 4 can be arranged compactly by utilizing the space formed below the convex portion 23 .

As shown in FIG. 2 , discharge ports 25 for discharging raw materials are formed in the six recesses 24 formed on the bottom surface of the recovery box 21 . As shown in FIG. 4 and FIG. 5 , the upper ends of the discharge chute 26 are respectively connected to a plurality of discharge ports 25 .

Each discharge chute 26 is inclined at an angle larger than the angle of repose of the raw material supplied thereinto. In this way, since the inclination angle of the discharge chute 26 is made larger than the angle of repose of the raw material, the raw material supplied into the discharge chute 26 does not stagnate in the discharge chute 26 . In addition, the cross-sectional area of each discharge groove 26 is set to a size suitable for the flow rate of the raw material.

As shown in FIGS. 3 and 5 , two conveyors 27 are arranged on the ground surface 9 of the grinder, and raw materials discharged from the discharge chute 26 are loaded on the conveyors 27 . Raw materials are discharged from three adjacent discharge chutes 26 to one conveyor 27 . The conveyor 27 includes, for example, a belt conveyor.

The raw material loaded on the conveyor 27 is conveyed to the outside of the grinder by the conveyor 27 , further conveyed by a bucket elevator or the like, and returned to the turntable 2 to be pulverized again.

In the vertical roller mill 1 including the above configuration, the large-diameter raw material discharged to the periphery of the rotary table 2 by the centrifugal force generated by the rotation of the rotary table 2 is recovered in the recovery box 21, and 21 on the inclined surface 22 to be discharged from the discharge port 25.

Therefore, the rotary scraper installed on the rotary table required in the conventional vertical roller mill can be eliminated. Thus, the high reliability of the grinding machine can be maintained, and the production cost can be reduced because only the non-moving parts such as the discharge chute 26 and the recovery box 21 should be subjected to measures against wear and impact.

Furthermore, by not providing a scraper, the load on the turntable 2 is reduced. Accordingly, power consumption during operation of the grinder can be reduced.

In addition, in the vertical roller mill 1 of the present embodiment, since the rotary table 2 and the speed reducer 11 are separated, and the two are connected by the vertical connecting shaft 13, the rotary table 2 can be positioned relative to the ground surface 9 of the grinding machine. 2 in a relatively high configuration position. Therefore, the installation space in the height direction required for inclining the bottom surface of the recovery box 21 can fully be ensured.

Furthermore, since the size of the reduction gear 11 separated from the turntable 2 can be reduced, an installation space for other equipment can be secured around the reduction gear 11 . In this embodiment, using this installation space, two conveyors 27 are installed at the same level as the installation level of the speed reducer 11 (grinder installation surface).

Claims (6)

1. A vertical roller mill, comprising: Rotary table, the upper surface of which the crushed material is fed; a crushing roller for biting the object to be crushed between the rotary table and the rotary table; and a recovery box for recovering the pulverized objects discharged around the rotary table accompanying the rotation of the rotary table; and The bottom surface of the collection box is formed of a plurality of inclined surfaces inclined at an angle larger than an angle of repose of the crushed objects collected in the collection box. 2. The vertical roller mill according to claim 1, further comprising a discharge port formed in a concave portion of the bottom surface including the plurality of inclined surfaces. 3. The vertical roller mill according to claim 1 or 2, wherein the crushing roller is arranged at a position corresponding to a convex portion of the bottom surface including the plurality of inclined surfaces. 4. The vertical roller mill according to claim 1 or 2, further comprising: a plurality of discharge troughs arranged below a plurality of said outlets; and a conveyor for conveying the pulverized objects discharged from the plurality of discharge chutes; and At least two of the plurality of discharge chutes are configured to discharge the crushed materials to the common conveyor. 5. The vertical roller mill according to claim 1 or 2, further comprising: a speed reducer for transmitting driving force to the turntable; and The connecting shaft includes an upper end connected to the central portion of the lower surface of the turntable and a lower end connected to the reduction gear. 6. The vertical roller mill according to claim 5, further comprising a maintenance passage for the speed reducer to pass through and pull out, the maintenance passage is provided under the connection part, and the connection part will set The upper ends of the two stand parts on both sides of the maintenance passage are connected to each other.

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