JPS59199053A - Vertical type roller mill - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a vertical roller mill, and particularly relates to the improvement of a vertical roller mill.
This invention relates to a vertical roller mill whose purpose is to prevent rotational scratches between the grinding roller and the rotary table, thereby reducing uneven wear and vibration on the surfaces of the grinding roller and table.

Generally, in a vertical roller mill used for crushing cement 1 to raw materials or coal, -1 of the rotary table 1 is used as shown in Fig.
An annular groove 2 is carved concentrically around the central axis 3 of the rotary table on the - surface, and a bearing 5 is mounted on the tip of a roller shaft 4 that is swingably attached to the rotary table 1. The outer surface 7 of the crushing roller 6, which is rotatably attached to the rotary table 1, faces the 1-marking structure 2 through a small gap 8, and the raw material supplied to the center of the rotary table 1 is subjected to centrifugal force due to the rotation of the rotary table 1. The raw material flows into the groove 2 and is caught in the gap 8 between the grinding roller 6 and the grinding roller 6, so that the raw material is pinched between the grinding roller 6 and the grinding roller 6 and crushed.

Therefore, the rotational force of the rotary table 1 is transmitted to the crushing roller 4 through the raw material supplied to the gap 8, and as a result, the crushing roller 6 is driven by the rotary table 1.

When the surface speed of the crushing roller 6 and the surface speed of the groove 2 of the rotary table 1 are observed in detail, as shown in FIG. The speed is the distance M from the central axis 3 of the rotary table 1 to the point P.
The value (VP) is proportional to l (l + ), and the velocity distribution changes linearly as shown by a straight line 9.

On the other hand, the speed distribution of the surface speed (■9) of the crushing roller 6 at any point Q on the surface of the crushing roller 6 is the distance r from the axis of the roller shaft 4 supporting the crushing roller 6 to the surface of the crushing roller 6. (see Figure 1), so if the cross section of the crushing roller 6 is arc-shaped, the axial direction of the crushing roller 6 will be The speed distribution is such that it is fastest in the center and slows down toward the sides. Therefore, the surface velocity of both is a straight line 9. and curve 9 coincide at a point IO where they intersect, and at that point both rotate at the same surface velocity VI''1.

In this way, although the surface speeds of the crushing roller 6 and the rotary table 1 are the same at the above point 10, there is a difference in the surface i* degree of the two in areas outside of this point 10, and as a result, both surfaces It can be understood that the /11 contact is made through the raw material.

This sliding contact caused by the speed difference between the two surfaces causes large uneven wear on the surfaces of the crushing roller 6 and the groove 2 of the rotary table 1.
This also causes the crushing roller 6 to vibrate.

The reason why the speed difference occurs between the surface of the rotary table 1 and the surface of the crushing roller 6 is because the width of the crushing roller 6 is wide and the crushing roller 6 is integrated in the width direction. In order to suppress such uneven wear and vibration as much as possible, current vertical roller mills narrow the width L of the crushing roller (shown in the second figure) and lower the rotation speed of the rotary table 1. When countermeasures are taken, the area of the part where the material is compressed and pulverized becomes narrower, resulting in insufficient pulverization, resulting in uneven pulverization and a decrease in production.

The present invention has the following advantages: 1- The difference in surface speed between the grinding roller and the rotary table, which causes uneven wear or vibration, is caused by the fact that even though the grinding roller rotates as one unit, its width is wide. In view of this, the grinding roller is divided into a plurality of parts in the axial direction, each of the divided grinding rollers can be rotated independently, and the width of each divided grinding roller is narrowed to improve the surface area of the grinding table. By reducing the difference between the circumferential speed and the circumferential speed of the surface of each grinding roller, and by keeping the width of all the grinding rollers arranged in the axial direction sufficiently wide, a sufficiently wide clamping area is secured, and the production volume is reduced. This is a vertical roller mill that crushes raw materials by squeezing them between a rotary table that is actively rotated and a crushing roller that is rotatably supported on a roller shaft. The grinding roller is divided into a plurality of grinding rows in the axial direction of the roller shaft, and each of the divided grinding rollers is independently rotatably supported on the roller shaft.

Next, embodiments embodying the present invention will be described in detail with reference to the accompanying drawings starting from FIG. 3 to provide an understanding of the present invention. Here, FIG. 3 is a side sectional view of a crushing roller used in the vertical roller mill according to the first embodiment of the present invention, and FIG. 4 is a side sectional view of a crushing roller that can be used in the vertical roller mill according to the second embodiment of the invention This is a side cross section of the crushing roller.

In No. 3 and 1 showing the first embodiment, reference numeral 11 is a roller shaft, which is fixed to the tip of an arm 12 that is swingably supported by a support mechanism (not shown) provided outside the machine. It is inserted into the mill chamber 15 through an insertion hole 14 provided in the casing 13.

Tip part 1 of the shaft 11 inserted into the mill chamber 15
1. A substantially circular roller housing 17, which is coaxial with the tip portion 11a, is rotatably supported on the roller housing 17 via a bearing 16. On the outer periphery of this roller housing 17, a third
A plurality of annular bushings 18 (not shown in the figure) each having an 11-shaped side cross section are fitted in rows in the axial direction of the roller shaft 11, and each bushing 18 is divided into a plurality of bushings 18 in the axial direction of the roller shaft 11. The annular crushing roller pieces 19, 19, . . . are rotatably fitted.

In this way, the outer peripheral surface of the plurality of crushing roller pieces 19 arranged in the axial direction of the roller shaft 11 has a donut shape as a whole, and has a shape that follows the cross-sectional shape of the groove 2 of the rotary table 1 shown in FIG. In addition, there is a slight gap 20 between the adjacent crushing ports, which are adjacent to each other.
1 (ie, around the roller housing 17).

In addition, the crushing roller pieces 19, 19... arranged in the axial direction
The most extreme surface 19' of the crushed cola pieces 19. Due to the contact with the retainer 22, all the crushing roller pieces 19, 19... are sandwiched between both retainers 21, 22, and the roller shaft 11 is not moved in the axial direction .23 is bearing 16
The retainer 22 is a sealing member to prevent dust from entering the roller shaft 11 from outside the machine.
The roller shaft 11 is covered with a cover 24 that connects the arm 12 with the insertion hole 14 on the casing 13 side, and prevents the rotating roller shaft 11 from coming into direct contact with the insertion hole 14 on the casing 13 side.

Therefore, in the case of this device, the grooves 2 of the rotary table 1 and the outer circumferential surfaces of the group of crushing ports 19, 19, etc. face each other, and each crushing roller piece 1
9 is rotated, but since the circumferential speed of the surface of the groove 2 of the rotary table 1 is proportional to the distance from the central axis 3 as shown in FIG. 2, for example, the leftmost grinding shown in FIG. The roller piece 198 is the distance from the center point 1a on the groove 2 facing it to the center axis 3! i! The second crushing roller piece 191 from the left rotates at a speed proportional to trl. rotates at a circumferential speed proportional to the distance r2 from the point 1+ of the groove 2 facing this to the central axis 3. In this way, each crushing roller piece 19c, 19. I is the distance r3. from the point of the groove 2, 1- facing each other to the central axis 3. It will rotate at a circumferential speed proportional to r, and each crushing roller piece 19 will rotate independently at a separate circumferential speed. The width β of each crushing roller j) 19 divided in this way is the total width I,
The difference between the circumferential speed of the crushing roller piece 19 and the circumferential speed of the surface of the groove 2 of the table 1 is very small.
The displacement due to sliding friction between the surface of the crushing roller piece I9 and the surface of the groove 2 is minimized, and vibrations and the like caused by uneven wear and displacement of both surfaces are suppressed to a minimum.

In addition, in the embodiment shown in 1-, each crushing roller piece 19 is rotatably taken out via a housing 17 rotatably attached to the roller shaft 11, so that the crushing roller piece 1
9 rotates, the roller housing 17 rotates at a rotational speed that is approximately the average of the rotational speeds of the crushing roller pieces. The bushing 18 rotates at a speed slightly different from the rotational speed of the bushing 18, so that the sliding speed of the bushing 18 is small and wear of the bushing 18 is kept to a minimum.

In the embodiment shown in FIG.
is omitted, and the 9 pieces 19. of the crushed I cube are divided into a plurality of pieces in the axial direction of the roller shaft 11a. is an annular roller tire housing 17. through each roller tire housing 17a
the roller shaft 11. 16. It is supported so that it can be rotated by China and Germany respectively.

That is, in this case, the crushing roller piece 19. is fitted into the dovetail groove 25 on the outer periphery of the roller tire housing 17a, and is secured by the bolt 26 to the roller tire housing 17. It is fixed to the roller tire housing 17a by a roller tire presser 27 fixed to the roller tire housing 17a.

In this case, each crushing roller piece 19a, 191. Because the roller tire housings 17a also rotate separately due to the relative rotation of..., each crushing roller piece 19□.

Gap 20 provided between 19i, , 19c...
．． bearing 16. passes between adjacent roller tire housings. This gap 20a communicates with the space 28 where the bearing 16. Since there is a possibility that dust etc. may enter the gap 20. of the roller tire housing 17a. It is desirable to have a labyrinth packing structure 29 and an oil seal 30 interposed between the opposing portions that communicate with each other to prevent the intrusion of dust and the like.

Furthermore, the first stage (handle 1) of a series of roller tire housings 178
°((X(17, 1') is equipped with a lid-shaped bearing retainer 31 to prevent dust from entering the bearing 16. area, and the rear end roller tire housing 17.'' Attach the hair ring holder 32, and insert the oil seal 3 between the hair ring holder 32 and the [1-RA axis 11°].
3 to prevent dust and the like from entering the bearing 16□ portion.

As described above, the present invention provides a vertical roller mill that crushes raw materials by squeezing them between a rotary table that is actively rotationally driven and a crushing roller that is rotatably supported on a roller shaft. It is a vertical roller mill that is divided into a plurality of crushing rows in the axial direction of the roller shaft, and each of the divided crushing rollers is independently rotatably supported on the roller shaft. Each crushing roller can independently rotate at a rotation speed corresponding to the surface speed of the rotary table with which it comes into contact via the raw material, and the width of each divided crushing roller is made much smaller than the width of the entire crushing roller. Therefore, the difference between the surface speed of each divided grinding roller and the surface speed of the groove of the roller table can be made small, and the difference in surface speed between the grinding roller and the groove of the rotary table can be minimized. Uneven wear and vibration caused by the difference can be minimized, and the width of the entire crushing roller can be maintained as wide as before or wider.
We have succeeded in obtaining a vertical roller mill that is durable and has little grinding unevenness without reducing production.

[Brief explanation of drawings]

Figure 1 shows a side cross-section of a crushing roller that can be used in a conventional vertical roller mill, and Figure 2 shows the speed distribution of kJ at the contact area between the conventional crushing roller and the grooves on the surface of the rotary table. 3 and 4 are side sectional views of a crushing roller mill that can be used in a vertical roller mill according to an embodiment of the present invention. (Explanation of notes) 11...Roller shaft, 13...Casing 1
5... Mill chamber, 17... Mouth = Ra housing 19... Grinding roller piece (divided pulverizer 1-R)
17.1...Roller tight housing 17...Roller housing. Applicant: Kobe Steel, Ltd. (1 person) Agent
Patent Attorney Takeo Honjo] What if it's 15 years old? , ', i, -E 凋: (Spontaneous) 9/21/1980'' Pa.j, 1 Special ``1 Director-General 1, Incident Indication 1988 Patent Application No. 753geq2
, Name of the invention Vertical roller mill 3, Relationship with the person making the amendment ('l) Patent applicant address 1-3-18 Wakihama, Chuo-ku, Kobe, 651 Name (119) NriI Co., Ltd. y= Ml @Oka ＞
'Jr Representative 1 Female Fuyuhiko 4, Agent 530 6, [Detailed description of the invention column] of the specification subject to amendment, and '1
figure. Figures 2, 3, and 4 7. Delete the content of corrections. 11. Supplement to the drawings 11) j1 group of streets [Fig. 1, Fig. 2], Do It: (l
Replace the fork 11° [-Fig. 4]. Figure 2 Figure 3\3

Claims (1)

[Claims] 1. In a vertical roller mill that crushes raw materials by pinching them between a rotary table that is actively rotationally driven and a crushing roller that is rotatably supported on a roller shaft, the crushing roller A vertical roller mill characterized in that it is divided into a plurality of pulverizing rollers in the axial direction of a roller shaft, and each of the divided pulverizing rollers is independently supported on the roller shaft so as to be rotatable. 2. The vertical shaft according to claim 1, wherein the divided crushing rollers are supported on the roller shaft L via roller housings which are rotatably installed on the roller shaft L. Type roller mill. 3. The divided crushing rollers are individually connected to the L through bearings.
A vertical roller mill according to claim 1, which is supported on an l-ra shaft.