JPH051063B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is mainly used as a device for crushing raw materials and clinker in cement manufacturing equipment, and is also used for crushing blast furnace water slag and food raw materials. This article relates to horizontal roller mills that are also used in equipment, etc.

[Conventional technology]

A vertical roller mill as shown in FIG. 6 is often used in conventional crushing devices of this type.

This vertical roller mill has a cylindrical casing 42
It is equipped with a rotary table 2 rotatably supported within the rotary table 2 and crushing rollers 3 disposed on the rotary table 2 at appropriate intervals along the rotation direction of the rotary table 2. In such a vertical roller mill, as shown in FIG. 7, the center of the crushing roller 3 rotates in a direction tangential to the circular orbit diameter of the rotary table 2.

[Problem that the invention seeks to solve]

However, in the above vertical roller mill, considering the width d of the roller 3, the inner and outer surfaces of the roller 3,
A speed difference between the rotation speed of the rotary table 2,
That is, rotational deviation occurs, and since the circumferential direction of the roller 3 on the crushing operation surface 43 deviates from the orbital circle of the rotary table 2, the crushing efficiency by crushing is reduced, and at the same time, the above-mentioned This causes abnormal wear of the roller 3 and table 2, and further increases vibration.

The present invention was made to solve the problems of the conventional technology, and aims to improve the efficiency of crushing objects to be crushed, prevent abnormal wear of the rollers and table, and further reduce vibration of the machine body. The purpose is to provide a new horizontal roller mill that can.

[Means for solving problems]

In order to achieve the above object, the first invention has a shaft that is supported substantially horizontally and is driven to rotate, a material to be crushed is supplied to the bottom of the inner circumferential wall, and the pulverized powder is discharged through an opening at one end. A cylindrical table is formed at the discharge port for pulverizing, a roller that is pressed against the inner circumferential wall of the bottom of the table and rotates following the rotation of the table to pulverize the material to be pulverized, and hot gas is introduced into the table. a hot gas introducing means for blowing up and transferring the pulverized powder to the above-mentioned discharge port; connected to the discharge port and a separation plate for guiding the unpulverized material downstream of the discharge port and returning the unpulverized material to the table;
The gas containing powder discharged from this is sucked,
It is equipped with a gas classification section for classifying gas and powder.

Further, in the second invention, the shaft center is supported substantially horizontally and rotationally driven, and the material to be crushed is supplied to the bottom of the inner peripheral wall, and one end opening is used as a discharge port for discharging the crushed powdered material. a cylindrical table forming;
A roller that is pressed against the inner circumferential wall of the bottom of the table and rotates following the rotation of the table to crush the material to be crushed; and a roller that introduces hot gas into the table to send the crushed powder to the discharge port. A means for introducing hot gas to blow up and transfer the powder is provided at the outlet of the table, which guides the desired granular powder among the powder blown up by the hot gas to the downstream of the outlet and recycles the unpulverized powder. a classification plate for returning the gas to the table; a gas classification unit connected to the above-mentioned discharge port for sucking the gas containing powder discharged from it and classifying the gas into gas and powder; It is installed between the classification section and the discharge port of the table, is rotatably supported in synchronization with the table, and has a ball inside, which converts the powdered material transferred from the discharge port to the gas classification section into fine particles. The ball part is configured to include a ball part for pulverization processing.

[Effect]

According to the configuration of the first aspect of the present invention, the raw material to be crushed that is supplied into the cylindrical table is caught between the rollers that rotate following the rotation of this table, and is subjected to a crushing action. Move to the discharge port side.

The raw material to be crushed moves to the discharge port side under the crushing action, and the hot gas introduced into the table from the outside blows up the crushed powder toward the axis of the table. Next, while being subjected to the first classification action, in the process of being scraped up and falling by the rotation of the table, the first grain is supplied to the classification plate surface and is sieved into unpulverized material and crushed material (including powdered material). After undergoing the secondary classification action, the unpulverized material is returned to the table again and subjected to the pulverization action together with the new raw material, while the powdered material is transferred together with the gas to the gas classification section downstream of the outlet.

The powder and gas transferred to the gas classification section are
The third part is separated into refined powder and fine powder containing gas.
It undergoes the next classification action.

Further, according to the second aspect of the invention, in the first configuration, the pulverized bodies are subjected to a second classification action in which the pulverized bodies are sieved by the classification plate into unpulverized bodies and pulverized bodies, and the pulverized bodies are passed through the ball mill. supplied to the department.

When the ball mill rotates in synchronization with the table, the pulverized material supplied to the ball mill is mixed with the balls and pulverized into fine particles.
Then, it is transferred together with the gas to the downstream gas classification section.

The crushed bodies and gas transferred to the gas classification section are
It is separated into refined powder and fine powder containing gas.

〔Example〕

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the drawings. Note that the same reference numerals are used for components common to the conventional one.

FIG. 1 is a longitudinal sectional view of a horizontal roller mill according to the first invention, FIG. 2 is a sectional view taken along the line of FIG. 1, and FIG. 3 is a schematic diagram of a milling process incorporating the same horizontal roller mill.

As shown in the figure, the horizontal roller mill 1 according to the first invention is mainly composed of a cylindrical table 2, rollers 3, hot gas introduction means 4, a classification plate 5, and a gas classification section 6.

Specifically, the cylindrical table 2 is supported and rotated with its axis substantially horizontal, and the inner circumferential wall bottom 2
The material to be crushed 7 is supplied to a, and one end opening is a discharge port 2b for discharging the crushed powder 7a.
The opening at the other end forms an insertion port 2c into which a roller 3 and a raw material chute 8, which will be described later, are introduced.

Further, as shown in FIGS. 1 and 2, the cylindrical table 2 is provided with a hydraulic pad 9 at its lower part, and is configured to be rotatably supported from a fixed base around an axis.

Further, the roller 3 is pivotally supported by a roller shaft 10, is pressed against the inner circumferential wall bottom 2a of the table 2 by its own weight, and is configured to rotate following the rotation of the table 2 and crush the object 7 to be crushed. ing. Also,
The roller shaft 10 is connected to the insertion opening 2 of the cylindrical table 2.
c is inserted into the table 2, and its base end is pivotally supported on an externally provided support shaft 10a, and an arm 11 is connected via the support shaft 10a, and this arm 11 is equipped with a hydraulic cylinder. 12 are provided.

Therefore, when the hydraulic cylinder 12 is expanded and contracted, the roller shaft 10 is expanded and moved from the cylindrical table 2 via the support shaft 10a, so that the roller 3 can be easily taken out from the table 2. ing.

As shown in FIG. 2, the raw material chute 8 is provided with its discharge end 8a positioned in front of the table 2 and the roller 3. Further, the discharge end 8a is positioned so as to face the center of the width of the roller 3, as shown in FIG.

An air feeder 13 is provided on the input side of the raw material chute 8 to control the amount of material to be crushed.

A cylindrical portion 14 extending a predetermined length in the axial direction is integrally provided on the outlet 2b side of the table. This cylindrical portion 14 is provided with a large number of nozzle holes 14a for introducing hot gas into the interior. Furthermore, rake blades 14b are provided on the inner peripheral portion of the cylindrical portion 14 at predetermined intervals in the circumferential direction.

A casing 14d is provided on the outer periphery of the cylindrical portion 14 to surround the cylindrical portion 14 and supported from the fixed side so as to allow rotation of the cylindrical portion 14. This casing 14d is provided with a hot gas introduction means 4 at its bottom for introducing hot gas G, and therefore the hot gas G introduced into the casing 14d is rotated integrally with the table 2. The air is blown upward from a nozzle hole 14a located at the lower part of the cylindrical portion 14.

Opening 14 on the downstream side or discharge side of the cylindrical portion 14
A classification plate 5 is integrally attached to the periphery of c through a flange 5a. This classification board 5
is formed from a ring body coaxial with the opening 14c, and has an inclined surface portion 5b whose outer circumferential portion faces the table 2 side and is gradually reduced in diameter and extends, and whose inner circumferential portion faces the axis portion. The cone 5c is folded back to form a cone 5c whose diameter is gradually reduced, thereby closing the opening of the cylindrical portion 14. In addition, the inclined surface portion 5 of the outer peripheral portion
A large number of small holes 5d are formed in b. The inner diameter of these small holes 5d is set so that only powder having a desired particle size passes through them. In addition, classification board 5
is formed in an annular shape along the periphery of the opening 14c, but at least the table 2
It will be provided at a predetermined height position from the inner circumferential bottom of.

Further, a trunnion 15 is connected to the discharge side or the downstream side of the classification plate 5, which is overlapped and integrally joined to the flange 5a. A bearing 16 is interposed in the body portion of the trunnion 15, and the trunnion 15 is rotatably supported by an underframe 17 serving as a fixed side, and is configured to rotate integrally with the table 2. A bearing housing 18 is attached to the bearing 16 so as to cover it.

A gas classification section 6 is formed on the discharge side of the trunnion 15. This gas division plate 6 is mainly constituted by a hollow cylinder 19 coaxially connected to the trunnion 15. This hollow cylindrical body 19 has a predetermined length in the axial direction, and through holes 19a are formed along the circumferential direction at predetermined intervals. In addition, the hollow cylindrical body 19 has a trunnion 15.
A lid body 20 is provided for closing the opposite side. This hollow cylindrical body 19 is provided with an outlet housing 21 that surrounds the hollow cylindrical body 19 and allows the hollow cylindrical body 19 to rotate. The upper part of the housing 21 forms a gas trapping part for trapping gas and fine particle powder contained therein, and the lower part forms a powder trapping part for trapping powder. That is, a gas duct 21a is connected to the upper part of the housing for suctioning the inside and exhausting gas, and a lower part is connected to a fine powder for collecting the powder that falls by gravity from the through hole 19a and is classified. A chute 21b is connected.

A girth gear 23 is fixed to the outer periphery of the end of the hollow cylindrical body 19, and this gear 23 meshes with a pinion gear 24, and the shaft of this pinion gear 24 serves as a transmission shaft 25. 26 is this transmission shaft 2
5 bearings.

Further, as shown in FIG. 3, the gas classification plate 6
A ball mill 27 for further refining the powder into fine particles is connected to the fine powder chute 21b of the second part via an air feeder 22. A classifier 28 is connected to the discharge port of the ball mill 27 for classifying the processed powder into desired fine particle powder and coarse powder for reprocessing.

As shown in FIG. 3, the fine particle delivery system of the classifier 28 is merged with the gas duct 21 and connected to a dust collector 29. This dust collector 29 has a function of finally classifying the desired granular powder material transferred from the gas duct 21 and the discharge system. The dust collector 29 exhausts the gas to the outside via the blower 30, and the classified desired powder is taken out from the refined powder outlet 29b.

On the other hand, a reprocessing system is connected to the classifier 28, and this reprocessing system is provided with a storage hopper 28 and the bottom of this hopper 28, and collects the reprocessed powder and a return for returning to the table 2 again. line 28a
and a reclassifier 28b. A transfer line is connected to this reclassifier 28b for making the powder having a desired particle size merge with the refined powder outlet 29b.

Next, the operation of the embodiment of the first invention described above will be explained.

By rotationally driving the transmission shaft 25 by a rotational driving means (not shown), the pinion gear 24,
Girth gear 23, hollow cylinder 19, trunnion 1
5. The cylindrical portion 14 and the cylindrical table 2 are rotated together around the axis. Cylindrical table 2
When the roller 3 provided in the table 2 is rotated around the axis, the roller 3 provided in the table 2 rotates around the table 2 as shown in FIG.
It comes into pressure contact with the inner circumferential wall and rotates in the same direction as the table 2, in the direction of the arrow in the figure.

Therefore, from the raw material chute 8 to the cylindrical table 2
When the material to be crushed 7 is fed into the cylindrical table 2
and the rollers 3, and are then caught between them to be pulverized. The object to be crushed 7 is placed between the table 2 and the rollers 3.
When the powder is pulverized into a predetermined granular powder, it is scattered upward.

In this way, the scattered powder material flows to the discharge port on the downstream side because the inside of the table 2 is sucked by the gas duct 21a. The powder that scatters and flows toward the discharge port is further blown upward by the hot gas G introduced from the hot gas introducing means 4 through the nozzle holes 14, and is blown to the classification plate 5. By being blown up by hot gas in this manner, primary classification is performed. Small holes 5d are formed in the classification plate 5, and secondary classification is achieved by the powder passing through these small holes 5d. Powder having a diameter larger than the small hole 5d falls downward and returns to the roller 3.
and the table 2 to be pulverized.

In addition, since scraper blades 14b are provided in the cylindrical portion 14 surrounding the outer circumference of the classification plate 5, the powder remaining at the bottom is scraped up by the rotation of the cylindrical portion 14 and blown upward. become.

The powder that has been secondarily classified by the classification plate 5 passes through the trunnion 15 and is introduced into the gas classification section 6. The powder introduced into the gas classification section 6 is finally suction-classified by the gas duct 21a into a gas component 7c containing powder of desired particles (ultra-fine powder), and is then classified into powder with a large specific gravity. The body 7d is classified through the through hole 19a, collected at the lower part of the outlet housing 21, and subjected to tertiary classification. Powder with large specific gravity (refined powder) 7d
is transferred to a ball mill 27, where it is further pulverized into a powder of desired ultrafine particles.

The powder processed by the ball mill 27 is classified by the classifier 31, and the powder with desired particles is transferred to the dust collector 29, and the powder is transferred to the dust collector 29, and the powder is transferred to the dust collector 29, and the powder is transferred to the dust collector 29.
The gas is combined with the powder transferred from the gas and the powder is finally classified, and the desired granular powder, ie, ultrafine powder, can be extracted as a gas.

Incidentally, the coarse powder separated from the classifier 31 is collected in the hopper 28 and transferred to the table 2 again.
It will be reprocessed.

FIG. 4 is a longitudinal sectional view of a horizontal roller mill according to the second invention, and FIG. 5 is a schematic diagram of a milling process incorporating the same horizontal roller mill.

As shown in the figure, the horizontal roller mill 1 according to the second invention has a main configuration in which a fine grinding section 32 is interposed between the classification plate 5 and the trunnion 15 of the first invention shown in FIG. do.

Specifically, the fine grinding section 32
The mill shell 3 has an inlet side open to be connected to a downstream side or a discharge port, an outlet side closed with a perforated plate 33, and a shell liner 34 provided on the inner peripheral surface.
5 and a ball 36 inserted therein.

Flange portions 35a and 35b are provided on the front end outer periphery and the rear end outer periphery of this mill shell 35, respectively, and the flange portion 35a on the front end outer periphery abuts and is fixed with the outer periphery flange 5a of the classification plate 5, and the rear end outer periphery The flange 5b of the trunnion 15 abuts against and is fixed to the outer periphery flange 15a of the trunnion 15.

A gear flange 35c is protruded from the outer circumference of this mill shell 35, and this gear flange 35
A girth gear 37 is fixed to c. A pinion gear 38 meshes with this girth gear 37, similar to the first invention, and the shaft of this pinion gear 38 serves as a transmission shaft 39. 40 is a bearing of the transmission shaft 39, and 41 is a coarse grinding section which is a pre-process of the fine grinding section 32.

The above-mentioned shell liner 34 adopts a so-called ball classification liner in order to effectively contribute to fine pulverization of balls 36 of various sizes in the range of 40 mm to 17 mm. The vertical and cross sections are serrated to facilitate alignment of the small diameter balls.

The perforated plate 33 on the outlet side has a central portion protruding in a truncated conical shape, and its protruding end surface 33a is positioned on the same plane as the rear end edge 35d of the mill shell 35. Projecting tapered portion 33b of this perforated plate 33
A large number of small holes 33c are opened in the entire area except for.

And, the mirciel 3 on the outer periphery of this perforated plate 33
A rake blade 35e is provided inwardly protruding from an inner peripheral wall portion between a portion fixed to the inner periphery of the mill shell 35 and an outlet side edge 35d of the mill shell 35.

Next, the operation of the above-mentioned embodiment of the second invention will be explained.

When the transmission shaft 39 is driven, the pinion gear 3
8. Girth gear 37 and Mirciel 35 rotate,
Together with this, the trunnion 15 and the hollow cylinder 1
9, the cylindrical portion 14, and the cylindrical table 2 rotate, and the roller 3 also rotates following this rotation.

Now, when the material to be crushed 7 is supplied to the raw material chute 8, the material to be crushed 7 is ejected to the front where the cylindrical table 2 and the rollers 3 engage, and as they rotate, it is fed between them and is bitten. The material is crushed and subjected to a pulverizing action, and then transferred to the cylindrical portion 14 on the table outlet 2b side.

The material 7 to be crushed that has moved to this cylindrical portion 14 is
The pulverized powder 7a is transferred to the cylindrical portion 1 by the hot gas G introduced from below through the
4 receives the action of being blown up toward the axis (first classification action), and in the process of being raked up by the raking blades 14b due to the rotation of the cylindrical part 14 and falling, it hits the inclined surface part 5b where the small hole 5d is located. Here, the unpulverized material 7 is subjected to the action of being sieved into the unpulverized material 7b and the powdered material 7a (secondary classification action).
b is returned to the table 2 and subjected to the pulverizing action together with the new raw material, while the pulverizer 7b is
The powder is transferred into the mill shell 35 together with the powder and gas floated up by the subsequent classification action.

During the process of rotation, the powder 7a that has moved into the mill shell 35 is finely pulverized while being subjected to an impact action or a grinding action by the balls 36, and is transported downstream, hits the perforated plate 33, and is crushed. It is extruded downstream from the small hole 33c of the perforated plate 33 (tertiary classification action).

The fine powder 7a that accumulates in the lower space between the perforated plate 33 and the flange portion 15a of the trunnion 15 is scraped up by the scraper blades 35e and dropped onto the protruding tapered portion 33b from above. It is guided into the cylindrical portion 15b of the trunnion 15 by the tapered portion 33b.

The finely pulverized body 7e guided between the cylindrical portions 15b
is a guide protrusion 15c formed on its inner peripheral surface.
The gas is then transferred to the gas classification section 6.

The finely pulverized bodies 7e and the gas transferred to the gas classification section 6 are separated into fine powder and finely pulverized bodies containing gas (fourth classification action).

Incidentally, as shown in FIG. 5, the fine powder subjected to the fourth classification action may be further classified into fine particles through a classifier 28 to separate it into coarse fine powder and fine fine powder.

At that time, coarse refined powder is added to raw material shoot 8 along with new raw materials.
The refined powder is taken out as a finishing product.

On the other hand, the finely pulverized material containing the gas subjected to the fourth classification is sucked into the dust collector 29 by the blower 30, where it is separated into gas and refined powder, and the refined powder is used as a product. The gas is released into the atmosphere.

〔Effect of the invention〕

As described above, the horizontal roller mill of the present invention has the following effects.

Compared to a vertical roller mill, the crushing operation surface of the rollers and table covers the entire surface, there is no deviation in rotational speed, and the rolling force for crushing can be effectively applied from the rollers to the raw material to be crushed.

Therefore, grinding efficiency can be improved, abnormal wear of the rollers and table can be prevented, and vibration can be reduced.

By rotating the cylindrical table, only the coarse particles can be returned to the table surface, eliminating the need for an external circulation transport device.

Since it can be combined with a ball mill,
By using the roller mill of the first invention to perform pulverization (coarse pulverization) up to a particle size of approximately 1 mm, and by using the ball mill to perform fine pulverization, it is possible to efficiently obtain the desired fine powder particle size distribution.

In the pulverization process for manufacturing cement, the desired fine particle size distribution cannot be obtained using only roller mills with high pulverization efficiency, and ball mills with poor pulverization efficiency must be used. According to the present invention, the final pulverization By applying only a limited amount of pulverization in the process to a ball mill and using a roller mill to perform the first half of the pre-pulverization, the overall power consumption for pulverization can be significantly reduced.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of a horizontal roller mill according to the first invention, FIG. 2 is a cross-sectional view taken along the line shown in FIG.
The figure is a schematic system diagram of a milling process incorporating the same horizontal roller mill as above, Figure 4 is a vertical cross-sectional view of the horizontal roller mill according to the second invention, and Figure 5 is the milling process incorporating the horizontal roller mill of Figure 4. Schematic diagram of the process;
FIG. 6 is a partially cutaway side view of the main parts of a conventional vertical roller mill, and FIG. 7 is an explanatory diagram of the operation of the main parts of the same vertical roller mill. In the figure, 1 is a horizontal roller mill, 2 is a table, and 3
is a roller, 4 is a hot gas introduction means, 5 is a classification plate, 6
Reference numeral denotes a gas classification section, 7 a material to be crushed, 8 a raw material chute, 33 a perforated plate, 34 a shell liner, 35 a mill shell, and 36 a ball.

Claims (1)

[Scope of Claims] 1. A discharge port whose shaft center is supported substantially horizontally, is rotationally driven, supplies the material to be pulverized to the bottom of the inner peripheral wall, and has an opening at one end for discharging the pulverized powder. A cylindrical table formed in the table, a roller that is pressed against the inner circumferential wall of the bottom part of the table and rotates following the rotation of the table to crush the object to be crushed, and a hot gas is introduced into the table to crush the object. a hot gas introducing means for blowing up and transferring the powdered material to the discharge port; A classification plate is connected to the above-mentioned discharge port for guiding the unpulverized material downstream and returning it to the table, and the gas containing the powdery material discharged from this is sucked and classified into gas and powdery material. A horizontal roller mill characterized by being equipped with a gas classification section for 2. A cylindrical table whose shaft center is supported substantially horizontally and is rotationally driven, the material to be crushed is supplied to the bottom of the inner circumferential wall, and one end opening is formed as a discharge port for discharging the pulverized powder. , a roller that is pressed against the inner circumferential wall of the bottom of the table and rotates following the rotation of the table to crush the material to be crushed; and a roller that is in pressure contact with the inner circumferential wall of the bottom of the table to crush the material to be crushed; A hot gas introducing means is provided at the outlet of the table to blow up and transfer the powder to the hot gas. a classification plate for returning the gas to the table; a gas classification unit connected to the discharge port for sucking the gas containing the powder discharged from it and classifying it into gas and powder; It is provided between the gas classification section and the discharge port of the table, is rotatably supported in synchronization with the table, has a ball inside, and is used to transform the powder material transferred from the discharge port to the gas classification section into fine particles. A horizontal roller mill characterized by being equipped with a ball mill section for grinding.