WO1999059932A1

WO1999059932A1 - Cement grinder

Info

Publication number: WO1999059932A1
Application number: PCT/JP1998/002238
Authority: WO
Inventors: Hiromi Yamamoto
Original assignee: Hiromi Yamamoto
Priority date: 1998-05-21
Filing date: 1998-05-21
Publication date: 1999-11-25
Also published as: AU7449798A

Abstract

A cement grinder used for grinding raw cement so as to obtain ground cement used as a material for the production of concrete of a high fluidity, comprising a rotary grinding plate (2) joined to a rotary driving unit (21a), a stationary grinding plate (1) fixed to a machine frame (40) and opposed to the rotary grinding plate (2) in the axial direction thereof with a clearance (3) kept therebetween, a raw cement supply port (10) formed in one (stationary grinding plate (1)) of the grinding plates and communicating with the clearance (3), and protrusions (reticulum (50)) provided on an opposed surface (24) of at least the rotary grinding plate (2), wherein the raw cement supplied to the clearance (3) is ground by the relative frictional movements of the grinding plates and pulverized by the collision of raw cement particles, thus enabling the cement grinder of a simple construction to carry out the rounding of the cement particles and the manufacturing of micronized ground cement.

Description

Cement grinding equipment

Technical field

TECHNICAL FIELD The present invention relates to a cement grinding apparatus used for grinding raw material cement in order to obtain ground cement used as a concrete material when producing highly fluid concrete. Background art

Concrete with high fluidity can be easily and reliably filled into every corner of the formwork due to the fluidity of the concrete at the time of placing work, so simplification of the placing work and improvement of the reliability of concrete structures, etc. It has many advantages and is expected to increase in demand in the future. Conventionally, as cement used for fluid concrete, for example, ordinary cement (Portland cement, etc.) is used alone as admixture (fly ash, blast furnace slag fine powder, limestone fine powder, silica fume, etc.). Known are two-component cements and three-component cements that are mixed or mixed with admixtures from the beginning. These admixtures have improved fluidity and are capable of producing concrete with high density and high durability.

As described above, conventionally, in order to produce a concrete having fluidity, it is indispensable to mix an admixture, so that there has been a problem in that it is disadvantageous in terms of price and mixing time.

To cope with this problem, for example, as disclosed in Japanese Patent Application Laid-Open Publication No. Hei 2-3-111338, the raw material cement is finely divided into spherical particles, and the resulting cement is baked. Focus on increasing liquidity through effects

Replacement form (Rule 26) A high-speed airflow impact device “Nara High Pretizer I” (produced by Nara Machinery Co., Ltd.) has been proposed.

When supplied to the raw material cement colliding collision chamber, the high-speed airflow impact device scatters while rotating in the raw material culling collision chamber due to the rotation of the rotating plate and the blade attached thereto. The blades were configured to repeatedly collide between the blades and a large number of grooves provided on the surface of the stay. Therefore, by using this apparatus, it was possible to obtain cement fine particles which became spherical due to the angular force of the outer peripheral surface being 5. However, this high-speed airflow impact device has a structure in which the ring-shaped stay holds the ring-shaped collision chamber and surrounds the rotating plate. For this reason, it is necessary to machine the ring-shaped stator into an annular shape, which increases the size of the device and increases the manufacturing cost. Also, since the raw material cement is scattered and made spherical by the impact of the collision between the groove and the blade, it is difficult to obtain a polishing action by rubbing of the raw material cement there. For this reason, the raw material cement must be scattered at a high speed and the processing time needs to be long, so that there has been a problem that working efficiency cannot be improved.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and the raw cement is ground between a pair of grinding plates arranged axially facing each other. In other words, by combining the grinding action of the raw cement with the rubbing action of the raw cement and the crushing action of the raw cement, the grinding cement has a simple structure, but is efficient, and the cement particles are rounded and miniaturized. The purpose is to provide a cement grinding device that can be processed into a single piece. Disclosure of the invention

In the cement grinding apparatus of the present invention, the rotating grinding plate connected to the rotary driving device and the fixed grinding plate fixed to the machine frame keep a gap therebetween in the axial direction of the rotating grinding plate.

Replacement form (Rule 26) A supply hole for the raw material cement communicating with the gap is formed in one of the grinding plates, and at least a protruding portion is provided on the facing surface of the rotary grinding plate. In this case, the fixed grinding plate can also be provided with a protruding portion.

Further, in the cement grinding apparatus of the present invention, the rotary grinding plates connected to the rotary driving device are arranged so as to oppose each other in the axial direction of the rotary grinding plate so as to keep the gap so that the rotation direction is reversed. A supply hole for the raw material cement communicating with the gap is formed in one of the milling plates, and a protruding portion is provided on at least one of the rotating milling plates in a facing surface. In this case, a projection can be provided on each of the rotary grinding plates.

Therefore, when using this cement grinding device, the raw material cement is supplied from the supply hole while the rotary grinding plate is rotated by the rotary driving device. The raw material cement flows into the gap, where it is swirled by the projections provided on the rotary milling plate, moves in the circumferential direction, and is ground by the centrifugal force while moving in the outer circumferential direction. That is, during this movement, the cement particles are polished by the rubbing of the cement particles due to the rotation of the crushing plate, and are crushed by the impact by colliding with the protrusions. It is discharged from the outer periphery of the gap as crushed cement.

In the milled cement thus obtained, the cement particles have rounded corners. In addition, the cement particles are miniaturized by the angular force of the cement particles, and are further miniaturized by the removed corners and cracks of the cement particles. Therefore, since the cement particles are rounded, the fluidity can be improved by the bearing effect. In addition, since the particle diameter of the cement particles is reduced as a whole, the voids between the particles are reduced, and the actual volume ratio is improved. As a result, it is possible to reduce the unit water volume, improve the specificity of the concrete, and obtain a high-density, fine, highly durable concrete.

In addition, in the present invention, a pair of grinding plates are arranged to face each other in the axial direction.

Replacement form (Rule 26) Although it is simple, it can combine the grinding action due to the rubbing of the raw material cement and the crushing action due to the collision of the raw material cement, efficiently processing cement particles that are rounded and miniaturized. can do.

Here, as the raw material cement, a portland cement system containing a cement clinker having a specific surface area of more than 2000 cm ² Zg (ordinary portland cement, early-strength portland cement, ultra-high-strength portland cement, moderate heat Portland cement, including the sulfate resistance por Bok land cement), in addition, the specific surface area of ^{2 0 0 0 cm 2 / gl} ^ mixed cementitious containing the cement clinker Lh (blast furnace cement, fly ash cement, silica Special cement (including alumina cement and ultra-hard cement) can be used. Further, the ground cement obtained by grinding the raw material cement once or a plurality of times may be used alone, or a mixture of the above-mentioned cements may be used again as the raw material cement. In addition, the raw material cement can be used after being heated to 150 ° C. to 140 ° C., and in this case, the grinding of the raw material cement is promoted, and efficient processing can be performed.

As for the orientation of the two grinding plates, there are a mode in which the plates are vertically opposed, a mode in which the plates are horizontally opposed, and a mode in which the plates are obliquely arranged.

In addition, there is a mode in which the position of the supply hole for the raw material cement is formed at the center of the milling plate, or in a position eccentric from the center of the milling plate.

The gap formed between the two grinding plates may be formed in a flat shape, a conical shape, or a spherical shape.

In addition, there is a mode in which the gap is gradually narrowed from the central portion to the outer peripheral portion, and a mode in which a protruding edge projects toward the gap along the outer circumference of at least one of the grinding plates. . This protruding edge can be provided on both grinding plates

Replacement form (Rule 26) You. Since the peripheral speed and centrifugal force of the rotating milling plate are higher on the outer peripheral side, the moving speed of the raw material cement flowing into the gap increases as it moves to the outer peripheral side, and the raw material cement power becomes less sparse. This reduces the friction between the cement particles. On the other hand, if the gap is formed gradually narrower from the center to the outer periphery, or if a protruding edge is protruded along the outer periphery of the grinding plate, the outlet of the cement becomes narrower, so that the amount of cement discharge is reduced. Is suppressed. This will cause the feed cement to move closer in the gap; I will move in a dog-like manner and will stay in the gap longer. Therefore, the rubbing between the cement particles becomes thicker and the rubbing time becomes longer. As a result, the raw material cement can be efficiently and effectively ground.

There is also a mode in which an air blowing hole for blowing air into the gap is formed in one of the grinding plates. The air blow hole may be used as a supply hole for raw cement, or may be formed on one of the grinding plates separately from the supply hole for raw cement. When the rotary milling plate is rotated at high speed, the crushing action by the impact increases, but on the other hand, the centrifugal force increases, so the residence time in the gap of the raw cement decreases, and the cement particles rub against each other. The polishing action by the sapphire is reduced. On the other hand, when the rotary grinding plate is rotated at a low speed, the crushing action due to the impact is reduced, but the centrifugal force is reduced, so that the residence time of the raw cement in the gap is prolonged and the cement particles rub against each other. The polishing action by the mating increases. Thus, the force that sets the number of rotations of the rotary grinding plate while considering the balance between the grinding action and the crushing action When the rotating grinding plate is rotated at a low speed, the movement of the raw material cement in the outer circumferential direction As a result, the amount of waste (the amount of processing) decreases by s. Therefore, if the raw material cement is forcibly moved in the outer peripheral direction by blowing air from the air blowing hole, the discharge amount can be adjusted by increasing or decreasing the blowing amount. Further, regarding the protruding portion, a mode in which this is a mesh body stretched on the opposing surface, a mode in which it is a number of protruding bodies protruding on the opposing surface, a combination of the net and the protruding body

Replacement form (Rule 26) There is an embodiment in which The protrusions include protrusions or ridges, and combinations of protrusions and ridges.

Further, there is a mode in which the protruding portion includes a protruding portion formed such that the protruding height H is equal to or less than half (H≤2L) of the valley interval L between the protruding portions. The projecting portion has a function of moving the raw material cement in the gap in the circumferential direction and a function of crushing the raw material cement by an impact caused by collision with the raw material cement. When the raw cement force is clogged in the valleys between the protrusions, the height of the protrusion decreases accordingly, and the effect of the protrusion decreases. Therefore, in order to prevent the raw cement from clogging the valleys between the protruding parts as much as possible, include a protruding part in which the relationship between the valley spacing L and the protruding height H is H≤2L. I decided that. If H> 2L, the valley interval L becomes too narrow, and the valley tends to be clogged with the raw material cement. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a schematic sectional view of a preferred cement grinding apparatus according to the present invention. FIG. 2 is a plan view of a rotary grinding plate provided in the cement grinding device, and FIG. 3 is an enlarged cross-sectional view showing a net as a projection provided in the rotary grinding plate. FIGS. 4 and 5 are schematic cross-sectional views showing a rotary driving form of a grinding plate provided in a cement grinding apparatus. FIGS. 6 and 7 are schematic cross-sectional views showing a facing arrangement form of the grinding plates. Fig. 8 is a schematic sectional view showing the position of the supply holes provided in the grinding plate, Figs. 9 to 11 are schematic sectional views showing the form of the gap formed between the grinding plates, and Figs. Figures 13 and 13 are schematic cross-sectional views showing the configuration of the air blow holes provided in the grinding plate, and Figs. 14 to 17 are the shapes of the protrusions provided on the opposing surface of the grinding plate. FIGS. 18 to 23 show cross-sectional shapes of the protruding portions, and are cross-sectional explanatory diagrams showing the relationship between the protruding height and the valley interval between the protruding portions, FIGS. 24 and Fig. 25 shows the protrusion

Replacement form (Rule 26) It is sectional explanatory drawing which shows the relationship between protruding height and the space | interval of a valley part between protrusion parts. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a schematic sectional view of a cement grinding apparatus according to one embodiment of the present invention, FIG. 2 is a plan view of a rotary grinding plate provided in the cement grinding apparatus, and FIG. It is an expanded sectional view of the protrusion provided in this rotary grinding plate. This cement grinding device includes a fixed grinding plate 1 and a rotating grinding plate 2 that are arranged vertically and opposed to each other, and a gap 3 is formed between the grinding plates 1 and 2.

The fixed grinding plate 1 is made of metal (iron, iron, stainless steel, etc.), synthetic resin, ceramic, other materials having excellent wear resistance, and the like, and is formed in a circular shape. A cement supply hole is formed. The fixed grinding plate 1 is fixed to the casing 4 via a machine frame 40. The casing 4 is formed of stainless steel in a cylindrical shape, and is formed at its upper end with a loading hopper 41 s communicating with the supply hole 10 and at its lower end with a discharge square 42 force.

The rotary grinding plate 2 is formed in a circular shape with the same material as the fixed grinding plate 1, and a rotation driving device 20a is connected to a central portion of the lower surface thereof. In this rotary drive device 20a, a rotary shaft 21 pivotally supported by a casing 4 is connected to the center of the lower surface of the rotary grinding plate 2, and a pulley 22 is attached to the rotary shaft 21. The belt 2 is wound around the belt 2 ³ times ³ times, and the rotating force from a drive motor (not shown) is transmitted to the rotary grinding plate 2 via the rotating shaft 21.

The gap 3 is formed in a planar shape, and protruding edges 30 and 30 are protruded toward the gap 3 along the outer circumferences of the grinding plates 1 and 2. The protruding edge 30 is not always necessary, and the protruding edge 30 is

Replacement form (Rule 26) In some cases.

On the opposing surfaces 11 and 24 of the grinding plates 1 and 2, reticulated bodies 50 and 50 are respectively provided as projections. The mesh 50 of the rotary milling plate 2 will be described. As shown in FIGS. 2 and 3, a metal wire rod 51 having a circular cross section is woven in a lattice shape. It is manufactured separately and attached to the opposing surface 24 of the rotary grinding plate 2 by welding. In addition, this net-like body 50 has a protruding portion formed such that the protruding height H of the metal wire 51 constituting the net is less than half (H≤2 L) of the valley interval L between the metal wires 51. Contains. The mesh 50 of the fixed grinding plate 1 is formed in the same manner. It is sufficient that the mesh body 50 (projection) is provided at least on the facing surface 24 of the rotary grinding plate 2.

When using the cement grinding apparatus according to this embodiment, the raw cement is supplied from the supply hole 10 while the rotary grinding plate 2 is rotated by the rotary drive device 20a. This raw material cement flows into the gap 3, where it is swirled by the mesh 50 provided on the rotary milling plate 2, moves in the circumferential direction, and is ground by the centrifugal force while moving in the outer circumferential direction. . That is, during this movement, the cement particles are polished by the rubbing of the cement particles due to the rotation of the rotary grinding plate 2, and are crushed by the impact by colliding with the nets 50, 50. The milled raw cement is discharged from the outer periphery of the gap 3 as milled cement.

As described above, the raw material cement supplied from the supply hole 10 flows into the gap 3, is ground there, and then discharged from the outer periphery of the gap 3. Milled cement can be produced continuously.

Further, in this embodiment, since the protruding edges 30, 30 are protruded along the outer peripheries of the both grinding plates 1, 2, the outlet of the cement is narrow. As a result, the amount of cement discharged is suppressed, so that the raw material cement

Replacement form (Rule 26) 3 will move in a dense state, and the residence time in the gap 3 will increase. Therefore, the friction between the cement particles is increased, and the time for the friction is prolonged. As a result, the raw material cement can be efficiently and effectively ground.

Further, the mesh 50 of the rotary milling plate 2 has a function of moving the raw material cement in the circumferential direction in the gap 3, and the meshes 50, 50 of the milling plates 1, 2 However, the impact of the collision with the raw material cement has the effect of crushing the raw material cement. However, if the raw material cement is clogged in the valley between the metal wires 51 and 51, the protruding height becomes lower. The effect of the network 50 is reduced. Therefore, in order to prevent the raw material cement from clogging the valley between the metal wires 51 and 51 as much as possible, the relationship between the valley interval L and the protrusion height H should be H≤2L. We decided to include the protruding part of

In addition, the present applicant shows an example of a test result when a fluid cement is manufactured using this cement grinding device.

Ordinary Portland cement was used as the raw material cement, and the diameter of fixed milling plate 1 and rotating milling plate 2 was set to 80 cm, and rotating milling plate 2 was rotated at 300 O rpm to produce milled cement. .

When the slamb values of the concrete produced using the raw cement before processing and the concrete produced using the ground cement after processing were measured, the concrete using the raw cement was 15.5 cm. On the other hand, concrete with milled cement was 18.5 cm. In addition, when the raw cement was heated to 800 ° C. to produce a milled cement, the slump value was 20 cm. If the temperature is less than 15 (TC, the grinding process cannot be accelerated, and if the temperature exceeds 140 ° C, the raw material cement will be melted. C ~ 140 ° C. As is evident from the test results, it is necessary to grind the raw material cement.

Replacement form (Rule 26) Thus, fluidity can be improved, and if the raw material cement is heated, grinding is further promoted and efficient processing can be performed.

Hereinafter, other embodiments of the present invention will be described. In the following embodiments, the same components as those in the embodiment shown in FIG. 1 have the same reference numerals in the drawings, and a description thereof will be omitted.

First, a description will be given of a rotation driving mode of the grinding plate.

Fig. 4 shows the case where the rotating grinding plate 2 is placed on the upper side and the fixed grinding plate 1 is placed on the lower side and opposed to each other. Drive 2 ◦ b is connected. In this rotary drive device 20b, a cylindrical rotary shaft 25 supported by a casing is connected to the center of the upper surface of the rotary grinding plate 2, and a pulley 26 force is attached to the cylindrical rotary shaft 25. The belt 27 is rotated by the pulley 26, and the rotational force of a drive motor (not shown) is transmitted to the rotary grinding plate 2 via the cylindrical rotary shaft 25. It has become. A supply hole 28 communicating with the inside of the cylindrical rotary shaft 25 is formed at the center of the rotary milling plate 2, and the raw material cement passes through the inside of the cylindrical rotary shaft 25 and is supplied with the supply hole 28. From the gap 3 to the gap 3.

Fig. 5 shows a case where the rotary grinding plates 2, 2 connected to the rotary drive units 20a, 20b are opposed to each other while maintaining a gap 3 so that the rotation direction is reversed. A supply hole 28 for the raw material cement communicating with the gap 3 is formed in the upper rotary milling plate 2. In this case, the protruding portion may be provided on each of the rotary grinding plates 2, 2, or may be provided on at least one of the rotary grinding plates 2.

Next, the direction of the grinding plate will be described. In each of the following embodiments, a force indicating a case where the fixed milling plate 1 and the rotary milling plate 2 are arranged opposite to each other is used to connect the rotary milling plates 2 and 2 as shown in FIG. It can also be applied to the case of facing. Further, a cement grinding apparatus may be configured by combining the following embodiments.

Replacement form (Rule 26) Fig. 6 shows a case where both grinding plates 1 and 2 are arranged to face each other in the left and right direction, and Fig. 7 shows a case where both grinding plates 1 and 2 are arranged to face each other diagonally.

Further, the position of the feed hole 10 for the raw cement may be formed at a position eccentric from the center of the milling plate 1 as shown in FIG.

Next, the gap 3 formed between the two grinding plates 1 and 2 will be described. FIG. 9 shows a case where the gap 3 is formed in an upward conical shape, and FIG. 10 shows a case where the gap 3 is formed in an upward spherical shape. The gap 3 may be formed in a downward conical shape or a downward spherical shape.

Fig. 11 shows the case where the gap 3 is gradually narrowed from the center to the outer periphery.The opposing surface 11 of the fixed grinding plate 1 is formed as a flat surface, and the rotary grinding is performed. The opposing surface 24 of the crushing plate 2 is formed as an inclined surface that gradually becomes deeper from the outer periphery toward the center. Contrary to this, the opposed surface 11 of the fixed grinding plate 1 may be formed as an inclined surface, and the opposed surface 24 of the rotary grinding plate 2 may be formed as a flat surface. The opposing surfaces 11 and 24 of the plate 1 and the rotary milling plate 2 may be formed on inclined surfaces, respectively.

Next, the case where an air blowing hole is formed in the grinding plate will be described.

Fig. 12 shows the case where the supply hole 10 formed in the upper fixed grinding plate 1 is also used as the air blowing hole 6〇, and Fig. 13 shows the case where the upper rotating grinding plate 2 is formed. This shows a case where an air blow hole 61 is formed in the lower fixed grinding plate 1 separately from the feed hole 28 for the raw material cement. In the case of FIG. 13, the air blowing hole 61 has its outlet formed by a large number of small holes 62, and the small holes 62 are opened obliquely from the center toward the outer periphery. In the figure, reference numeral 63 denotes an air introducing cylinder. The operation of the air blowing holes 60 and 61 described above has been described in the section of the disclosure of the present invention, and will not be described.

Next, the protrusion will be described with reference to FIGS. 14 to 25. FIG.

Fig. 14 shows a number of protrusions with protrusions projecting from the facing surface 24.

Replacement form (Rule 26) The case where the projection 52 is formed is shown. The planar shape of the projection 52 can be arbitrarily determined, such as a circle, a square, or a cross.

FIG. 15 shows a case where the projecting portion is formed by a large number of projecting ridges 53 which are a large number of projecting bodies projecting radially from the facing surface 24. The planar shape of the ridge 53 is formed in an arc shape in which the surface of the rotary grinding plate 2 in the rotation direction (the direction of the arrow) is concave. The plane shape of the ridge 53 can be arbitrarily determined, such as a force, a linear shape, a wavy shape, a net shape, a spider web shape, or the like.

FIG. 16 shows a case where the projections are formed by a combination of a number of projections 52 projecting from the facing surface 24 and a number of projections 53 formed in a spider web shape.

FIG. 17 shows a case where the protruding portion is formed by a combination of the net 50, the protrusion 52, and the protrusion 53.

Regarding the cross-sectional shape of the protruding portion 5, a rectangular cross-section as shown in Fig. 18, a triangular cross-section as shown in Fig. 19, a circular cross-section as shown in Fig. 20, and a trapezoidal cross-section as shown in Fig. 21 In addition, it may be formed in a semicircle or the like.

Regarding the cross-sectional shape of the protruding portion 5, for example, as shown in FIG. 22, the cross-sectional shape may be the same circular cross-section, and the size may be different. Alternatively, as shown in FIG. Different cross-sectional shapes may be combined, such as combining cross-sections.

Regarding the relationship between the protruding height H of the protruding portion 5 and the valley interval L, when the protruding portion has a rectangular cross section or a trapezoidal cross section as shown in FIGS. 18 and 21, the valley interval L is The distance from the upper edge 54 of the protruding portion 5. When the protruding portion has a triangular cross section or a circular cross section as shown in FIGS. 19 and 20, the top of the protruding portion 5 The distance from Also, as shown in Fig. 22 and Fig. 23, when the protruding height force ^{s is} different, it is expressed by the relational expression with the valley interval L (H≤2L)

Replacement paper (Kaikai IJ26) The protrusion height H refers to the protrusion height of the lower protrusion 5a. In the case where the protruding portion is formed of the mesh body 50, at the intersection of the metal wires 51, the protruding height is twice as large as that of the metal wire 5] due to the overlap of the metal wires 51. The protruding height is different between the intersection and the portion other than the intersection. Also in this case, the protrusion height H refers to the height of the protrusion having the lower height.

For reference, FIGS. 24 and 25 show examples of the case where H> 2 L in the relationship between the protrusion height H and the valley interval L. In this example, the valley becomes narrower, which causes a problem that the raw material cement tends to cause clogging.

In addition, it is desirable that the protruding portion in which the relationship between the protruding height H and the valley interval L satisfies H≤2 includes 20% or more of the entire protruding portion. In a preferred form, the force formed when including 80% lil ± of the entire protruding portion is at least 20% or more of the entire protruding portion. A crushing effect is obtained.

If it is less than 20%, the grinding efficiency is too high and it can be said that it is not suitable for practical use. In addition, the material of the attrition plate, the diameter of the attrition plate, the rotation speed, the clearance of the gap, and the like are appropriately determined according to the degree of attrition, the throughput, and the like. Also, the rotary drive device may have any structure as long as the rotary force from the drive source can be transmitted to the grinding plate by a transmission means such as a belt, a chain, and a gear. Industrial applicability

As described above, in the cement grinding apparatus according to the present invention, the ground cement thus processed is used as a raw material for concrete buildings in the construction industry, concrete structures in the civil engineering industry, and other concrete products. Can be used as In particular, the use of the milled cement processed by this cement milling equipment makes it possible to reduce the fluidity of concrete and to increase the power of concrete.

Replacement form (Rule 26) It can be used for various concrete industries because it can produce high-quality concrete that is easy to apply and has a good finish because it can improve the density and provide high-density, fine-grained and highly durable concrete. Can be. In addition, the processing step using this cement grinding device can be usefully used for a cement production brand because it can be incorporated into a conventional cement production process.

Replacement form (Rule 26)

Claims

The scope of the claims

1. A rotating cement plate connected to a rotary drive and a fixed grinding plate fixed to the machine frame are arranged opposite to each other in the axial direction of the rotating grinding plate with a gap therebetween, and the raw material cement communicates with the gap. A cement grinding device characterized in that a supply hole force is formed on one of the grinding plates, and at least a protruding portion force ^{5 is} provided on a facing surface of the rotating grinding plate.

2-The rotating milling plates connected to the rotary driving device so that the rotating directions are opposite to each other, and are arranged opposite to each other in the axial direction of the rotary milling plate while maintaining a force gap therebetween, and the raw material cement communicating with the gap is formed. A cement grinding frame device formed on a grinding plate having a supply hole force, and a projection force provided on at least an opposing surface of the rotating grinding plate having a surface.

3-The cement grinding device according to claim 1 or 2, wherein the both grinding plate forces U: the cement grinding device arranged to face downward.

3. The cement grinding apparatus according to claim 1 or 2, wherein both grinding plate forces are opposed to each other in the left-right direction.

5. The cement grinding apparatus according to claim 1 or 2, wherein the both grinding plate forces are opposed to each other in the fourth direction.

6. The cement grinding apparatus according to claim 1 or 2, wherein a supply force of a raw material cement is provided at a center of the grinding plate.

7. The cement grinding apparatus according to claim 1, wherein the supply hole for the raw material cement is formed at a position eccentric from the center of the grinding plate.

8. The cement grinder according to claim 1 or 2, wherein the gap is formed in a plane.

9-Claim 1¾Χ is the cement grinding equipment S described in paragraph 2, A cement grinding device with a conical gap.

10. The cement grinding device according to claim 1 or 2, wherein the cement grinding device is formed in a gap-like surface.

11. The cement grinder according to claim 1 or 2, wherein the PB ¹ ] gap is gradually narrowed from the center to the outer periphery.

12. The cement grinding device according to claim 1 or 2, wherein a protruding edge projects toward a gap along an outer periphery of at least one of the grinding plates. .

13. The cement chrysler according to claim 1 or 2, wherein an air blowing hole for blowing air into the gap is formed in one of the grinding plates.

14. The cement grinding apparatus according to claim 13, wherein the air blowing hole also serves as a supply hole for the raw material cement.

15. The cement grinding apparatus according to claim 13, wherein the air blowing hole is formed in one of the grinding plates separately from the supply hole for the raw material cement.

16. The cement grinding apparatus according to claim 1 or 2, wherein a force of the projecting portion is << a mesh body stretched on the facing surface.

17. The cement grinding apparatus according to claim 1 or 2, wherein the projections are a number of protrusions projecting from the opposing surface.

18. The cement grinding apparatus according to claim 1 or 2, wherein the cement is a combination of a net-like body having a protruding portion stretched on the facing surface and a protruding body projecting from the facing surface. Trimming device.

19. The cement grinding apparatus according to claim 1 or 2, wherein the projecting portion has a projecting height Η of not more than half of a valley interval L between projecting portions (Η≤ 2 L) Cement milling device including a protruding part formed in it.

20. The cement grinder according to claim 1 or 2, wherein the cement churning is a Portland cement system containing a raw material cement power; a cement clean power of 2000 cm ² ZgJiLh. apparatus.

21-Claim 1 or 2 In the cement grinding apparatus described in R above, the cement cement is a mixed cement system in which the raw material cement has a specific surface area of 2,000 cm ² / giiU. Crusher.

22. The cement grinding apparatus according to claim 1 or 2, wherein the raw material cement is heated to 150 to 140 crc.