CN114178000A

CN114178000A - Fine grinding machine

Info

Publication number: CN114178000A
Application number: CN202111314328.7A
Authority: CN
Inventors: 苏鑫; 纪任山; 王志星; 张保华; 张红顺; 王实朴; 裘星; 蔡洪涛; 罗伟; 于海鹏; 柳冠青; 李小炯; 崔豫泓; 李晓娇; 刘刚; 张鑫; 刘振宇; 孟长芳; 贾东亮; 杜伯犀
Original assignee: China Coal Research Institute Ccri Energy Saving Technology Co ltd
Current assignee: China Coal Research Institute Ccri Energy Saving Technology Co ltd
Priority date: 2021-11-08
Filing date: 2021-11-08
Publication date: 2022-03-15

Abstract

The invention discloses a fine grinding machine which comprises a horizontal cylinder and a grinding assembly, wherein a feed port and a discharge port are formed in the horizontal cylinder, the feed port and the discharge port are arranged at intervals along the axial direction of the horizontal cylinder, the grinding assembly comprises a plurality of grinding discs, the grinding discs are arranged in the horizontal cylinder, the plurality of grinding discs are arranged at intervals along the axial direction of the horizontal cylinder, and the distance between every two adjacent grinding discs in the plurality of grinding discs is gradually reduced along the direction from the discharge port to the feed port. The fine grinding machine has the advantages of good grinding effect and high production efficiency.

Description

Fine grinding machine

Technical Field

The invention relates to the technical field of coal slurry grinding, in particular to a fine grinding machine.

Background

The coal water slurry is a coal-based liquid fuel and gasification raw material which are prepared by coal, water and additives according to a certain proportion, can be used for coal substitution and oil substitution combustion of industrial and power station boilers as the liquid fuel, can be used for coal water slurry gasification to prepare synthesis gas as the gasification raw material, and then is used for synthesizing chemical products such as ammonia, methanol, olefin, oil products, natural gas and the like through a subsequent process. The coal water slurry needs to be ground by a fine grinding machine in the preparation process, but the fine grinding machine in the related technology has poor grinding effect and low production efficiency.

Disclosure of Invention

The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.

Therefore, the embodiment of the invention provides the fine grinding machine which is good in grinding effect and high in production efficiency.

A fine grinding machine according to an embodiment of the present invention includes: the horizontal barrel is provided with a feed inlet and a discharge outlet which are arranged at intervals along the axial direction of the horizontal barrel; the grinding assembly comprises a plurality of grinding discs, the grinding discs are arranged in the horizontal cylinder body at intervals along the axial direction of the horizontal cylinder body, and the distance between every two adjacent grinding discs in the plurality of grinding discs is gradually reduced along the direction from the discharge port to the feed port.

According to the fine grinding machine provided by the embodiment of the invention, when the fine grinding machine works, the coal water slurry enters the horizontal cylinder from the feeding hole and flows out from the discharging hole after being ground by the grinding discs, and the gap between the adjacent grinding discs close to the feeding hole is smaller than the gap between the adjacent grinding discs close to the discharging hole, so that the grinding frequency of the coal water slurry initially entering the horizontal cylinder is higher, the grinding effect of the fine grinding machine is better, and the production efficiency is improved.

In some embodiments, the distance between two adjacent grinding disks is L1, the radius of the peripheral contour of the grinding disks is R, wherein L1/R is more than or equal to 0.15.

In some embodiments, the grinding assembly further includes a driving component and a cantilever shaft, the grinding disc is disposed on the cantilever shaft, a first end of the cantilever shaft is connected to the driving component, a second end of the cantilever shaft extends into the horizontal cylinder, and the driving component is configured to drive the cantilever shaft to rotate relative to the horizontal cylinder.

In some embodiments, the pulverizer further comprises a separation assembly located in the horizontal cylinder and at the second end of the cantilever shaft, wherein the separation assembly is used for separating coal water slurry from grinding media and discharging the coal water slurry from the discharge port.

In some embodiments, the plurality of abrasive disks comprises an outermost abrasive disk adjacent to the separation assembly at a distance L2 from the separation assembly, the abrasive disk having a radius R, wherein L2/R ≦ 0.15.

In some embodiments, the grinding disc is provided with a shaft hole and a hollow hole, the axis of the shaft hole coincides with the axis of the grinding disc, the hollow hole has a first wall surface and a second wall surface, the first wall surface and the second wall surface are opposite and spaced along the circumferential direction of the grinding disc, and in a cross section orthogonal to the axial direction of the grinding disc, the curvature radius of the projection of the first wall surface is greater than the curvature radius of the projection of the second wall surface.

In some embodiments, the first wall surface is a circular arc surface, and/or the second wall surface is a circular arc surface.

In some embodiments, in a cross section orthogonal to the axial direction of the grinding disc, the radius of a circle on which the first wall surface projects is R1, and the radius of a circle on which the second wall surface projects is R2, wherein R2/R1 is 0.5 ≦ R2/R1 ≦ 0.7.

In some embodiments, the hollow hole further has a third wall surface and a fourth wall surface, the third wall surface and the fourth wall surface are arranged opposite to each other in a radial direction of the grinding disc, the third wall surface is closer to a rotation center of the grinding disc than the fourth wall surface, and the third wall surface and the fourth wall surface are both arc-shaped surfaces protruding in a direction away from the rotation center of the grinding disc.

In some embodiments, the plurality of hollow holes are arranged at intervals along the axis of the shaft hole.

Drawings

FIG. 1 is a schematic view of a refiner of an embodiment of the present invention.

FIG. 2 is a schematic internal view of a refiner of an embodiment of the present invention.

FIG. 3 is a cross-sectional view of a refiner of an embodiment of the present invention.

FIG. 4 is a schematic view of the grinding disk of the refiner of an embodiment of the present invention.

Fig. 5 is a cross-sectional view a-a in fig. 4.

Reference numerals:

1. a horizontal cylinder; 11. a feed inlet; 12. a discharge port;

2. a grinding assembly; 21. a grinding disk; 211. hollowing out holes; 2111. a first wall surface; 2112. a second wall surface; 2113. a third wall surface; 2114. a fourth wall surface; 212. a shaft hole; 22. a drive member; 23. a cantilever shaft;

3. and (4) separating the components.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

A fine grinding machine according to an embodiment of the present invention is described below with reference to the drawings.

As shown in fig. 1 to 5, a fine grinding machine according to an embodiment of the present invention includes: the horizontal type barrel comprises a horizontal barrel 1 and a grinding assembly 2, wherein a feed inlet 11 and a discharge outlet 12 are arranged on the horizontal barrel 1, and the feed inlet 11 and the discharge outlet 12 are arranged at intervals along the axial direction (such as the left and right direction of figure 3) of the horizontal barrel 1. Grinding unit 2 includes abrasive disc 21, and in abrasive disc 21 located horizontal barrel 1, abrasive disc 21 was a plurality of, and a plurality of abrasive discs 21 arranged along horizontal barrel 1's axial interval, and the distance between the adjacent abrasive disc 21 in a plurality of abrasive discs 21 reduces along the direction from discharge gate 12 to feed inlet 11 gradually.

According to the fine grinding machine provided by the embodiment of the invention, when the fine grinding machine works, the coal water slurry enters the horizontal cylinder body 1 from the feeding hole 11 and flows out from the discharging hole 12 after being ground by the grinding discs 21, and because the gap between the adjacent grinding discs 21 close to the feeding hole 11 is smaller than the gap between the adjacent grinding discs 21 close to the discharging hole 12, the grinding frequency of the coal water slurry initially entering the horizontal cylinder body 1 is higher, the grinding effect of the fine grinding machine is better, and the production efficiency is improved.

It can be understood that the fine grinding machine of the embodiment of the invention can improve the grinding efficiency of the fine grinding machine without increasing the number of the grinding discs 21 by optimizing the position arrangement of the grinding discs 21, so that the fine grinding machine has reasonable structural design and better practicability.

Further, as shown in FIG. 3, the distance between two adjacent grinding disks 21 is L1, the radius of the outer peripheral profile of the grinding disks 21 is R, wherein L1/R ≧ 0.15, alternatively L1/R may be 0.15, 0.16, 0.17, 0.18, 0.19, 0.2. The inventor finds through experimental study that when L1/R satisfies the above range, it is possible to ensure that two adjacent grinding disks 21 have a larger space so that the grinding medium and the coal-water slurry pass through the hollow holes 211 of the grinding disks 21, thereby improving the grinding efficiency of the fine grinding machine.

In some embodiments, as shown in fig. 2 and 3, the grinding assembly 2 further includes a driving part 22 and a cantilever shaft 23, the grinding disc 21 is disposed on the cantilever shaft 23, a first end of the cantilever shaft 23 (e.g., a left end of the cantilever shaft 23 in fig. 3) is connected to the driving part 22, a second end of the cantilever shaft 23 (e.g., a right end of the cantilever shaft 23 in fig. 3) extends into the horizontal cylinder 1, and the driving part 22 is configured to drive the cantilever shaft 23 to rotate relative to the horizontal cylinder 1. For example, the drive member may be an electric motor.

Further, as shown in fig. 2 and fig. 3, the pulverizer further includes a separation assembly 3, the separation assembly 3 is located in the horizontal cylinder 1 and is disposed at the second end of the cantilever shaft 23, and the separation assembly 3 is configured to separate the coal water slurry from the grinding medium and discharge the coal water slurry from the discharge port 12. The fine grinding machine provided by the embodiment of the invention can carry out centrifugal separation on the coal water slurry and the grinding medium through the separation component 3, so that the grinding medium is prevented from being discharged from the discharge hole 12 along with the coal water slurry, and the separation effect of the coal water slurry is further improved.

Specifically, as shown in FIG. 3, the plurality of grinding disks 21 includes an outermost grinding disk 21 adjacent to the separating assembly 3, the outermost grinding disk 21 is at a distance L2 from the separating assembly 3, and the radius of the grinding disk 21 is R, wherein L2/R ≦ 0.15. It will be appreciated that the distance L2 between the outermost abrasive disc 21 and the separating assembly 3 is less than the distance L1 between two adjacent abrasive discs 21.

For example, L2/R may be 0.1, 0.11, 0.12. The inventors have found through experimental studies that when L2/R satisfies the above range, the accumulation of grinding media between the outermost grinding disks 21 and the separation module 3 can be reduced, and the separation effect of the separation module 3 can be improved.

In some embodiments, as shown in fig. 4, the grinding disc 21 is provided with a shaft hole 212 and a hollow hole 211, an axis of the shaft hole 212 coincides with an axis of the grinding disc 21, the hollow hole 211 has a first wall surface 2111 and a second wall surface 2112, the first wall surface 2111 and the second wall surface 2112 are opposite to each other and spaced apart from each other along a circumferential direction of the grinding disc 21, and in a cross section orthogonal to an axial direction of the grinding disc 21, a curvature radius of a projection of the first wall surface 2111 is greater than a curvature radius of a projection of the second wall surface 2112.

According to the grinding disc 21 of the fine grinding machine provided by the embodiment of the invention, the first wall surface 2111 and the second wall surface 2112 are opposite and arranged at intervals along the circumferential direction of the grinding disc 21, so that when the grinding disc 21 rotates, the first wall surface 2111 of the hollow hole 211 enters the material earlier than the second wall surface 2112, and the curvature radius of the projection of the first wall surface 2111 is larger than that of the projection of the second wall surface 2112, so that the speed of the material flowing out of the hollow hole 211 is larger than the speed of the material entering the hollow hole 211, the stirring and mixing efficiency of the coal water slurry and the grinding medium is increased, the coal water slurry is ground more fully, and the production efficiency is higher.

In some embodiments, as shown in fig. 4, in a cross section orthogonal to the axial direction of the abrasive disk 21, the projection of the first wall surface 2111 is a circular arc surface, and/or the projection of the second wall surface 2112 is a circular arc surface. Alternatively, only the first wall surface 2111 is an arc surface, and alternatively, only the second wall surface 2112 is an arc surface.

Preferably, the first wall 2111 and the second wall 2112 are both arc surfaces. It can be understood that the first wall surface 2111 and the second wall surface 2112 both have a constant curvature radius, so that the speed of the coal water slurry and the grinding medium entering the hollow hole 211 and flowing out of the hollow hole 211 is uniform, which is beneficial to improving the grinding effect of the coal water slurry, and the first wall surface 2111 and the second wall surface 2112 are both arc surfaces, so that the structural design of the hollow hole 211 is reasonable, and the processing and manufacturing of the hollow hole 211 are facilitated.

Further, as shown in FIG. 4, in the cross section orthogonal to the axial direction of the abrasive disk 21, the radius of the circle on which the projection of the first wall surface 2111 is located is R1, and the radius of the circle on which the projection of the second wall surface 2112 is located is R2, wherein R2/R1 is 0.5. ltoreq.R 2/R1. ltoreq.0.7. Through experimental research, the inventor finds that when the ratio R2/R1 meets the ratio range, the stirring and mixing efficiency of the coal water slurry and the grinding medium can be further improved, so that the coal water slurry is ground more fully, and the production efficiency is higher. Alternatively, R2/R1 may be 0.5, 0.6, or 0.7. Preferably, when R2 is 40mm, R1 is 65mm, and R2/R1 are 0.6, the grinding effect of the grinding disk 21 is good.

In some embodiments, as shown in FIG. 4, in a cross section orthogonal to the axial direction of the abrasive disk 21, a line connecting the center of a circle on which the first wall surface 2111 is projected and the center of rotation of the abrasive disk 21 is a first line, a line connecting the center of a circle on which the second wall surface 2112 is projected and the center of rotation of the abrasive disk 21 is a second line, and an angle α between the first line and the second line is 60 ° or more and 80 ° or less. The inventor finds out through experimental research that when the included angle alpha meets the ratio range, the grinding disc 21 can be ensured to have higher structural strength, and the grinding effect of the grinding disc 21 can be ensured. Alternatively, α may be 60 °, 70 ° or 80 °, and preferably, α is 72 °, the grinding effect of the grinding disk 21 is better.

In some embodiments, as shown in FIG. 5, the axial direction of the holes 211 is at an angle β to the axial direction of the abrasive disk 21, wherein 0 ≦ β ≦ 35. Because the included angle beta is formed between the axial direction of the hollow hole 211 and the axial direction of the grinding disc 21, when the grinding disc 21 rotates, the hollow hole 211 of the grinding disc 21 can further drive the coal water slurry and the grinding medium to rotate, so that the coal water slurry is ground more fully, and the production efficiency of the coal water slurry is improved.

It can be understood that, because the inner wall surface of the hollow hole 211 has a certain inclination angle, when the grinding disc 21 rotates, the inner wall surface of the hollow hole 211 can gradually push the coal water slurry and the grinding media from the feeding end of the horizontal cylinder 1 to the discharging end of the horizontal cylinder 1, so that the grinding media are uniformly distributed in the horizontal cylinder 1, the problem that the grinding media are locally accumulated in the horizontal cylinder 1 is avoided, and the coal water slurry can be sufficiently ground.

The inventor finds that the grinding effect of the grinding disc 21 is better when the included angle beta is more than or equal to 0 degrees and less than or equal to 35 degrees. Optionally, when the included angle β is 10 °, 20 °, 30 ° or 35 °, the grinding effect of the grinding disc 21 is better, and the distribution of the grinding media in the horizontal cylinder 1 is more uniform.

In some embodiments, as shown in fig. 4, the hollowed-out hole 211 further has a third wall 2113 and a fourth wall 2114, the third wall 2113 and the fourth wall 2114 are arranged opposite and spaced apart in the radial direction of the abrasive disc 21, the third wall 2113 is closer to the center of rotation of the abrasive disc 21 than the fourth wall 2114, and the third wall 2113 and the fourth wall 2114 are both arc-shaped surfaces that are convex in a direction away from the center of rotation of the abrasive disc 21. It will be appreciated that the first, third, second, and

fourth walls

2111, 2113, 2112, 2114 are connected end to enclose the interior wall surfaces of the hollow bore 211. The grinding disc 21 of the fine grinding machine of the embodiment of the present invention can further improve the grinding effect of the grinding disc 21 by providing the third wall surface 2113 and the fourth wall surface 2114 as arc-shaped surfaces that are convex toward a direction away from the rotational center of the grinding disc 21.

Further, as shown in fig. 4, the plurality of hollow holes 211 are provided, and at least some of the plurality of hollow holes 211 are uniformly and alternately arranged along the axis of the shaft hole 212. For example, the number of the hollow holes 211 is three, and the three hollow holes 211 are uniformly and alternately arranged along the axis of the shaft hole 212. According to the grinding disc 21 of the fine grinding machine provided by the embodiment of the invention, the plurality of uniformly arranged hollow holes 211 are formed, so that the grinding media in the horizontal cylinder 1 are more uniformly distributed, and the grinding effect of the grinding disc 21 is further improved.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the present disclosure, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" and the like mean that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims

1. A refiner, characterized in that it comprises:

the horizontal barrel is provided with a feed inlet and a discharge outlet which are arranged at intervals along the axial direction of the horizontal barrel;

the grinding assembly comprises a plurality of grinding discs, the grinding discs are arranged in the horizontal cylinder body at intervals along the axial direction of the horizontal cylinder body, and the distance between every two adjacent grinding discs in the plurality of grinding discs is gradually reduced along the direction from the discharge port to the feed port.

2. A refiner as claimed in claim 1, wherein the distance between two adjacent grinding discs is L1, the radius of the outer peripheral profile of the grinding discs is R, wherein L1/R ≧ 0.15.

3. The refiner of claim 1 wherein the grinding assembly further comprises a drive member and a cantilevered shaft, the grinding disc is disposed on the cantilevered shaft, a first end of the cantilevered shaft is connected to the drive member, a second end of the cantilevered shaft extends into the horizontal barrel, and the drive member is configured to drive the cantilevered shaft to rotate relative to the horizontal barrel.

4. The pulverizer of claim 3, further comprising a separation assembly positioned within the horizontal barrel and at the second end of the cantilevered shaft, the separation assembly configured to separate the coal-water slurry from the grinding media and discharge the coal-water slurry from the discharge outlet.

5. A refiner as claimed in claim 4, wherein the plurality of grinding discs includes an outermost grinding disc adjacent to the separation assembly, the outermost grinding disc being at a distance L2 from the separation assembly, the grinding disc having a radius R, wherein L2/R ≦ 0.15.

6. The refiner of claim 1 wherein the grinding disc is provided with an axial hole and a hollow hole, the axial line of the axial hole coincides with the axial line of the grinding disc, the hollow hole has a first wall surface and a second wall surface, the first wall surface and the second wall surface are arranged oppositely and at intervals along the circumferential direction of the grinding disc, and the radius of curvature of the projection of the first wall surface is larger than that of the projection of the second wall surface in the cross section orthogonal to the axial direction of the grinding disc.

7. A refiner as claimed in claim 6, wherein the first wall surface is a circular arc surface and/or the second wall surface is a circular arc surface.

8. A refiner as claimed in claim 7, wherein, in a cross-section orthogonal to the axial direction of the grinding disc, the radius of the circle on which the first wall surface projects is R1, and the radius of the circle on which the second wall surface projects is R2, wherein 0.5. ltoreq.R 2/R1. ltoreq.0.7.

9. A refiner according to claim 6, wherein the bore further has a third wall surface and a fourth wall surface, the third wall surface and the fourth wall surface being arranged opposite to each other in a radial direction of the grinding disc, the third wall surface being adjacent to a rotation center of the grinding disc compared to the fourth wall surface, the third wall surface and the fourth wall surface each being an arc-shaped surface that is convex in a direction away from the rotation center of the grinding disc.

10. The fine grinding machine according to claim 6, wherein the hollow holes are plural, and at least some of the plural hollow holes are arranged uniformly and at intervals along the axis of the shaft hole.