JPS62266147A - Nozzle apparatus of 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 (Industrial Application Field) The present invention relates to a nozzle device for a roller mill for pulverizing cement clinker, slag, cement raw materials, coal, and the like.

(Prior art) Conventionally, roller mills have been used to finely grind objects to be ground.
This roller mill includes, for example, those constructed as shown in Japanese Patent Publication No. 60-51851 and as shown in FIGS. 5 to 8.

That is, in FIG. 5, l is a roller mill, and its base 2
A pedestal 3 is provided above, and a casing 4 is mounted on this pedestal 3.
is supported. In addition, the same casing 4 is placed on the base 2.
A pulverizing table 5 is supported at the bottom thereof so as to be rotatable about a vertical axis, and this pulverizing table 5 is rotationally driven by an electric motor 7 (indicated by an arrow R in the figure).

Further, a space surrounded by the inner surface of the casing 4 and the upper surface of the crushing table 5 is a crushing chamber 8, and the crushing table 5 has a table liner 9 on its upper surface that comes into contact with the material to be crushed in the crushing chamber 8. are doing.

This table liner 9 is arranged along the circumferential direction of the crushing table 5 and is divided into equal intervals in the circumferential direction.

On the other hand, a plurality of crushing rollers 10 are provided which pressurize and crush the object to be crushed on the table liner 9. These pulverizing rollers 10 are arranged at equal intervals in the circumferential direction with respect to the pulverizing table 5, and each pulverizing roller 10 is a roller supported by a pivot shaft 12 supported on the pedestal 3 side so as to be freely movable downward. It is composed of a shaft 14 and a roller body 15 that is freely rotatably supported at the rotating end of the roller shaft 14. Further, one end of an interlocking link 16 is connected to the roller shaft 14, and the other end of the interlocking link 16 is connected to a cylinder rod of the hydraulic cylinder 11.

When the electric motor 7 rotates the crushing table 5 and the hydraulic cylinder 11 is retracted, the roller shaft 14 is rotated downward, and the roller body 15 is rotated downward.
The lower blade rotates. Then, the object to be crushed on the table liner 91- is sandwiched between the rotating table liner 9 and the roller main body 15, and crushed and crushed by the pressure thereof, and is pulverized.

Further, a nozzle 17 is provided that guides an air flow generated by a fan (not shown) from the lower side of the grinding table 5 into the grinding chamber 8 . The airflow blows the crushed material spilling from the crushing table 57 into the crushing chamber 8L due to the centrifugal force of the crushing table 5, and pulverizes the blown up crushed material to below a predetermined particle size. The roller mill 1
Transport outside of. The air volume and speed of the air flow in the nozzle 17115n are determined by the amount of pulverization of the object to be pulverized and its properties such as particle size and specific gravity.

The nozzle 17 will be explained with reference to FIGS. 6 to 8. This nozzle 17 includes a conical cylindrical outer cylindrical member 20 provided on the same axis I- as the center of rotation of the crushing table 5, an inner cylindrical member 21 fitted into this, and the outer cylindrical member 20 and the inner cylindrical member 21. It is formed by a partition plate 22 which is provided between the grinding chamber B and makes the air flow G jet out at a predetermined angle into the grinding chamber B and swirl the air flow G. These outer cylinder member 20 and inner cylinder member 2
1. The partition plates 22 are each formed by welding or body casting.

A support piece 23 is provided protrudingly on the inner peripheral surface of the L casing 4,
The outer cylinder member 2 of the nozzle 17 marked 1- is attached to this support piece 23-1-.
The lower end of 0 is placed. Also, the mounting plate 24 attached to the nozzle 17 is attached to the casing 4 by bolts 25.
is screwed to. Thereby, the nozzle 17 is attached to the casing 4.

The airflow G generated by the fan passes through the nozzle 17 and is ejected into the grinding chamber 8 at a predetermined angle (indicated by the symbol θ in FIG. H and is guided to the outside of the roller mill l from the exhaust pipe 18. At this time, the pulverized material to be pulverized (indicated by reference numeral B in the figure) is moved into the pulverizing chamber 8 by the airflow G ejected from the nozzle 17.
The inside was blown off in the -L direction (as shown by arrow B in Figure 6),
Among the blown up materials to be crushed, those having a particle size smaller than a predetermined particle size are transported from the exhaust pipe 18 to the outside of the roller mill l along with the flow of the air flow G.

(Problems to be Solved by the Invention) By the way, when the same roller mill changes the amount of crushed material each time it is operated, there is a method to prevent the operating efficiency of the fan and roller mill 1 from decreasing. In order to ensure reliable transportation of the material to be crushed, it is necessary to increase or decrease the volume of the air flow G. However, in the conventional configuration described above, since the opening area of the nozzle 17 is constant, when the air volume of the air flow G is increased or decreased, the wind speed in the nozzle 17 changes, resulting in the following inconvenience.

That is, when the amount of pulverization of the object to be pulverized as described in item 2 increases, it is necessary to increase the volume of the airflow G, but when the volume of the airflow G is increased, the wind speed at the nozzle 17 increases accordingly. . However, this causes the inconvenience that the pressure loss of the air flow G in the nozzle 17 increases, and
Dust contained in the air flow G accelerates wear of the nozzle 17, resulting in a disadvantage that the life of the nozzle 17 is reduced and the operating efficiency of the roller mill I is reduced.

On the other hand, when the amount of grinding is small, the air volume is reduced.
Along with this, the wind speed in the nozzle 17 becomes slower. Therefore, the airflow G in the nozzle 17 moves the material to be crushed into the crushing chamber 8.
This results in a loss of energy for blowing it up to one side, and a large amount of the material to be crushed falls into this nozzle 17, resulting in a disadvantage that the operating efficiency of the roller mill 1 is reduced.

Further, the same inconvenience as described above occurs when the material to be crushed is changed from one with a certain property to one with different properties.

Therefore, even if IIM (of airflow G) is increased or decreased, nozzle 17
Conventionally, in order to keep the wind speed constant or to match the wind speed to the properties of the material to be crushed, a steel plate is attached to the top of the nozzle 17 by welding, and the opening area of the nozzle 17 can be adjusted using this iron plate. It is being said. However, in this case, it is necessary to cut and weld a steel plate each time the opening area of the nozzle 17 is adjusted, and this adjustment work is not only complicated, but also extremely difficult to finely adjust the opening area. be.

(Object of the Invention) This invention was made in view of the above-mentioned circumstances, and it is possible to adjust the airflow ejected from the nozzle to a predetermined wind speed that matches the amount and properties of the material to be crushed, and It is an object of the present invention to make it possible to easily adjust the wind speed, and to prevent the ability to blow up objects to be crushed to be reduced even when the wind speed at the nozzle is adjusted in this way.

(Structure of the Invention) The present invention for achieving the above object is characterized by the provision of an opening adjustment plate which is movably attached to the inner surface of the casing and which adjusts the opening and closing of the upper end opening of the nozzle by this movement. be.

(Example) Hereinafter, an example of the present invention will be described with reference to FIGS. 1 to 4. The basic configuration of each of these embodiments is the same as that of the prior art described above. Therefore, the same components are given the same reference numerals, and the explanation thereof will be omitted.

1 to 3 show a first embodiment.

In the figure, the nozzle 17 has an outer cylindrical member 20 provided on the inner surface side of the casing 4 and an inner cylindrical member 21 provided on the outer circumferential surface side of the crushing table 5.
It is considered to be 4. Further, the outer cylindrical member 20 has a partition plate 22 attached to its inner circumferential surface, and the gap between the radially inner end of the partition plate 22 and the outer circumferential surface of the inner cylindrical member 21 allows the inner The cylindrical member 21 and the partition plate 22 are in a non-contact state.

The outer cylindrical member 20 includes a conical cylindrical body 37 whose lower end is placed on the support piece 23, and an outer flange 38 projecting from the two ends of the cylindrical body 37 and extending toward the inner surface of the casing 4.
It consists of A notch 39 is formed on the outer periphery of the outer flange 38, and a wedge 41 is driven into the space formed by the notch 39 and the inner surface of the casing 4, whereby the outer cylinder member 20 is pushed into the inner surface of the casing 4. Positioned.

On the other hand, the inner chisel member 21 is divided at equal intervals in the circumferential direction and has an inverted shape in cross section, and its upper piece 21a is screwed to the outer peripheral upper surface 5a of the crushing table 5 by a port 42.

In the above configuration, a plurality of aperture adjustment plates 43 for adjusting opening and closing of the upper end opening of the nozzle 17 are provided at equal intervals in the circumferential direction of the nozzle 17. Each of these opening adjustment plates 43 is slidable on the outer flange 38 of the outer cylinder member 20 in the radial direction of the nozzle 17, and the upper end opening of the nozzle 17 is adjusted to open or close by sliding. In addition, the aperture adjustment plates 43 adjacent to each other
, 43 are formed with stepped surfaces 44, and by overlapping these stepped surfaces 44.44, it is possible to prevent a gap from forming between the adjacent aperture adjustment plates 43.43.

Furthermore, a notch groove 46 extending in the radial direction is formed on the radially outer end edge of each of the aperture adjustment plates 43.
This opening adjustment plate 43 is connected to the outer flange 38 of the outer cylinder member 20 on the inner surface side of the casing 4 by the port 47 passing through the opening adjustment plate 43.
is screwed onto the top surface of the

When adjusting the upper end opening area of the nozzle hole 34 using the opening adjustment plate 43, first loosen the port 47, then move the opening adjustment plate 43 in the radial direction so that the desired upper end opening area is obtained, and then Tighten 47. Then, the opening adjustment plate 43 is fixed to the outer flange 38 again, and this adjustment work is completed.

In addition, guide plates 49 are provided at the radially inner ends of the adjustment plates 43 to project upwardly into the crushing chamber 8, and these guide plates 49 crush the airflow G ejected from the nozzle holes 34. Guide the room 8 upwards. Furthermore, the opposing ends 50.50 of each of these guide plates 49 are formed substantially parallel to each other, and these opposing ends 50.50 are located on a line substantially parallel to the upward extension line of the partition plate 22. There is. In this case, each guide plate 49 also moves along with each aperture adjusting plate 43, and the opposing ends 50 of each guide plate 49 move.
Even if a gap is created between the nozzle holes 34 and 50, this gap is located on a line substantially parallel to the extension line of the partition plate 22, so that the airflow G ejected from the nozzle hole 34 is prevented from being disturbed by the gap. can.

FIG. 4 shows a second embodiment, in which the nozzle 17 is integrally molded as in the conventional example. In this case as well, the same effects as in the first embodiment can be obtained.

(Effects of the Invention) According to the present invention, since the opening rIR adjustment plate is provided which is movably attached to the inner surface of the casing and adjusts the opening and closing of the upper end opening of the nozzle by this movement, the opening adjustment plate can be moved in the radial direction. By doing so, it is possible to increase or decrease the -L end opening area of the nozzle. Therefore, for example, when the amount of pulverization of the material to be pulverized increases and it becomes necessary to increase the air volume, the air speed at the nozzle can be maintained at a predetermined speed by increasing the opening area. Therefore, firstly, the pressure loss of the nozzle is prevented from becoming excessive due to the wind speed indicated by L becoming excessively large. Secondly, the acceleration of wear on the nozzle due to dust in the airflow passing through the nozzle is prevented, thereby extending the life of the nozzle, thereby achieving five improvements in the operating efficiency of the roller mill. be done.

Further, when it becomes necessary to reduce the air volume due to the reduction in the amount of pulverization, the opening area can be reduced, so that the air speed at the nozzle outlet can be maintained at a predetermined speed in this case as well. Therefore, the loss of energy for blowing the crushed material to one side of the crushing chamber is prevented, and a large amount of the material to be crushed falls into the nozzle, reducing the operating efficiency of the roller mill. is prevented from doing so.

Furthermore, even when changing the material to be crushed from one having a certain property to one having different properties, the wind speed in the nozzle can be adjusted to a predetermined wind speed in the same manner as in Section 2.

Moreover, since the opening area of the nozzle can be adjusted by moving the opening adjustment plate in the radial direction and screwing it, this adjustment work can be made easy.

Moreover, since the adjustment plate 1 is provided on the inner surface side of the casing, the airflow is blown out from the interface between the periphery of the crushing table and the extending end of the opening adjustment plate. That is, when opening and closing the opening at the 1st end of the nozzle mentioned above, the airflow always blows out from the periphery of the grinding table. The material to be ground is moved to the periphery of the grinding table, and the material to be ground is immediately blown away by the air flow. Therefore, the inconvenience of the material to be crushed remaining on the peripheral edge of the crushing table after being crushed on the crushing table is prevented, and the crushing ability is prevented from decreasing.

[Brief explanation of the drawing]

1 to 4 show embodiments of the present invention, FIGS. 1 to 3 show the first embodiment, FIG. 1 is a partially enlarged sectional view of a roller mill, and FIG. -■■ line arrow view, Figure 3 is a ■-■ line arrow view of Figure 1, Figure 4 is the second embodiment and corresponds to Figure 1, Figures 5 to 8 are conventional For example, Fig. 5 is a partial cross-sectional side view of the entire roller mill, Fig. 6 is a partially enlarged cross-sectional view of Fig. 5, Fig. 7 is a view taken along the line ■-■ in Fig. 6, and Fig. 8 is the same. 6 is a view taken along the line ■-VW in FIG. 6; FIG. l @ Roller mill, 4 Φ casing, 5 Grinding table, 8 Grinding chamber, 17 Nozzle, 34 Nozzle hole, 43 Opening adjustment plate, G Air flow.

Claims (1)

[Claims] 1. A grinding table is provided inside the casing so as to be rotatable about the vertical axis, the space surrounded by the inner surface of the casing and the top surface of the grinding table is used as a grinding chamber, and airflow is guided into the grinding chamber from the lower side of the grinding table. In a roller mill in which a nozzle is formed between the outer circumferential surface of the grinding table and the inner surface of the casing facing the outer circumferential surface, the nozzle is movably attached to the inner surface of the casing, and this movement adjusts the opening and closing of the upper end opening of the nozzle. A roller mill nozzle device characterized by being provided with an aperture adjustment plate.