CN220514331U - Millstone seat and medium-speed coal mill - Google Patents
Millstone seat and medium-speed coal mill Download PDFInfo
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- CN220514331U CN220514331U CN202322033816.1U CN202322033816U CN220514331U CN 220514331 U CN220514331 U CN 220514331U CN 202322033816 U CN202322033816 U CN 202322033816U CN 220514331 U CN220514331 U CN 220514331U
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- Prior art keywords
- cap
- millstone
- air guide
- guide pipe
- air
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- 239000003245 coal Substances 0.000 title claims abstract description 37
- 239000002817 coal dust Substances 0.000 abstract description 8
- 230000008878 coupling Effects 0.000 abstract description 2
- 238000010168 coupling process Methods 0.000 abstract description 2
- 238000005859 coupling reaction Methods 0.000 abstract description 2
- 238000005243 fluidization Methods 0.000 description 6
- 239000003638 chemical reducing agent Substances 0.000 description 4
- 239000000428 dust Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
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- Crushing And Grinding (AREA)
Abstract
The utility model provides a mill seat and medium speed coal mill, includes mill seat body, and the top cap is installed to mill seat body upside, a plurality of air intakes have been seted up on the circumference wall of mill seat body, and the middle part of top cap is equipped with the through-hole, and the top cap upside is in corresponding the position of through-hole is installed the wind-guiding cap, the wind-guiding cap includes the cap body and support ring, and support ring upper end and cap body coupling, lower extreme and the through-hole intercommunication of top cap have been seted up on the circumference wall of support ring, form the wind-guiding passageway between the downside of the cap body and the upside of top cap. The air inlet is formed in the circumferential wall of the millstone seat body, the top cover is provided with the air guide cap, pressure hot air in the primary air chamber at the lower part of the coal mill is led out to the top cover, and coal dust in the inert area is blown away, so that the inert area in the center of the millstone seat is eliminated.
Description
Technical Field
The utility model relates to the technical field of medium-speed coal mills, in particular to a millstone seat and a medium-speed coal mill.
Background
And in the third period of a certain power plant, a direct-blowing positive pressure pulverizing system of a medium-speed coal pulverizer is adopted, hot primary air of the coal pulverizer is blown into the mill from a nozzle annular gap around the mill base, and pulverized coal carrying the edge of the mill base flows upwards to enter a powder conveying pipeline. Because the grinding roller is obliquely arranged, a weak wind area is formed right above the center of the grinding disc seat and below the grinding roller, only a small part of coal dust in the weak wind area can be smoothly carried by hot primary wind, a large amount of coal dust in the weak wind area is detained and repeatedly excessively ground due to incapability of being blown away, an inert area is formed in the middle of the upper side of the grinding disc, and hot wind is difficult to blow to reach the inert area on the grinding disc.
Chinese patent document CN109395837a, publication date: 2019.03.01 discloses a millstone fluidization device of a medium-speed coal mill, wherein a branch is upwards emitted from a hot primary air inlet pipe to form a fluidization air pipe, the other end of the fluidization air pipe extends to the inside of the medium-speed coal mill, and pressure hot air is introduced into an inert area on the upper side of the millstone through the fluidization air pipe. However, in the actual operation process, raw coal falls onto the millstone through a pipeline in the center of the coal mill, and impact damage is caused to the fluidization air pipe in the falling process of the raw coal, so that the fluidization air pipe cannot be used.
Disclosure of Invention
The utility model aims to solve the technical problems that: the problem that exists among the above-mentioned background art is solved, provides a mill seat, through seting up the air intake at mill seat body circumference wall to install the wind cap on the top cap, draw forth the hot-blast top cap of pressure in the primary air chamber of coal pulverizer lower part, blow away the buggy in the inertia region, thereby eliminate the inertia region in mill seat center.
Another technical problem to be solved by the utility model is: the medium-speed coal mill adopting the millstone seat is provided.
In order to achieve the technical characteristics, the aim of the utility model is realized in the following way: the utility model provides a mill seat, includes mill seat body, and the top cap is installed to mill seat body upside, a plurality of air intakes have been seted up on the circumference wall of mill seat body, and the middle part of top cap is equipped with the through-hole, and the top cap upside is corresponding the position of through-hole is installed the wind-guiding cap, the wind-guiding cap includes the cap body and support ring, and support ring upper end and cap body coupling, lower extreme and the through-hole intercommunication of top cap have been seted up a plurality of air outlets on the circumference wall of support ring, form the wind-guiding passageway between the downside of the cap body and the upside of top cap.
The cap body is of a cone structure.
The middle part of top cap upside is equipped with upwards conical surface, and the through-hole sets up the middle part at conical surface.
The lower side of the wind guide cap is a concave surface, and an inclined downward wind guide channel is formed between the lower side of the cap body and the conical surface.
The through hole is provided with internal threads, the lower end of the supporting ring is provided with an extending ring, the extending ring is provided with external threads, and the air guide cap is in threaded connection with the through hole through the extending ring.
The top of the cap body is provided with a disassembly blind hole for screwing and disassembling the wind guide cap.
The grinding disc seat is characterized in that a transverse air guide pipe and a vertical air guide pipe are arranged in the grinding disc seat body, one end of the transverse air guide pipe is connected with the inner wall of the grinding disc seat body and communicated with the air inlet, the other end of the transverse air guide pipe is communicated with the lower end of the vertical air guide pipe, and the upper end of the vertical air guide pipe is communicated with the through hole of the top cover.
The upper end of the vertical air guide pipe is inserted into the through hole.
The lower extreme of vertical guide duct is installed and is assembled bellows, and the horizontal guide duct other end and collection bellows intercommunication.
A medium speed coal mill is provided with a millstone seat.
The utility model has the following beneficial effects:
1. the air inlet is formed in the circumferential wall of the millstone seat body, the top cover is provided with the air guide cap, pressure hot air in the primary air chamber at the lower part of the coal mill is led out to the top cover, and coal dust in the inert area is blown away, so that the inert area in the center of the millstone seat is eliminated.
2. The cap body is of a cone structure, raw coal cannot fall on the cap body due to the cap body of the cone structure, and impact of the raw coal can be reduced. The upper side surface of the top cover is provided with an upward conical surface, so that raw coal particles can roll outwards conveniently. The lower side of the wind guide cap is a concave surface, and a downward inclined wind guide channel is formed between the lower side of the cap body and the conical surface, so that the air flow blows off the coal dust on the surface of the top cover.
3. The transverse air guide pipe and the vertical air guide pipe are arranged in the millstone seat body, so that dust and hot air are prevented from affecting the speed reducer below the millstone seat body.
4. The high-pressure primary air is properly split, so that the scouring of the high-pressure primary air to the grinding roller and accessories is weakened, and the service life of the grinding roller of the coal mill is prolonged.
Drawings
Fig. 1 is a schematic cross-sectional structure of a millstone seat installed in a medium speed coal mill.
Fig. 2 is an enlarged schematic view of the structure at a in fig. 1.
Fig. 3 is a schematic perspective view of the hood of the present utility model.
Fig. 4 is a schematic view of a perspective view of the bottom of the hood according to the present utility model.
In the figure: the grinding disc seat comprises a grinding disc seat body 1, an air inlet 11, a transverse air guide pipe 12, an air collecting box 13, a vertical air guide pipe 14, a top cover 2, a conical surface 21, a through hole 22, an air guide cap 3, a cap body 31, a support ring 32, an air outlet 33, an extension ring 34, a dismounting blind hole 35, an air guide channel 4 and a medium-speed coal mill 100.
Detailed Description
Embodiments of the present utility model will be further described with reference to the accompanying drawings.
Embodiment one:
referring to fig. 1-4, a millstone seat comprises a millstone seat body 1, a top cover 2 is installed on the upper side of the millstone seat body 1, a plurality of air inlets 11 are formed in the circumferential wall of the millstone seat body 1, a through hole 22 is formed in the middle of the top cover 2, a wind guide cap 3 is installed on the upper side of the top cover 2 at a position corresponding to the through hole 22, the wind guide cap 3 comprises a cap body 31 and a support ring 32, the upper end of the support ring 32 is connected with the cap body 31, the lower end of the support ring is communicated with the through hole 22 of the top cover 2, a plurality of air outlets 33 are formed in the circumferential wall of the support ring 32, and a wind guide channel 4 is formed between the lower side surface of the cap body 31 and the upper side surface of the top cover 2. The air inlet 11 is formed in the circumferential wall of the millstone seat body 1, the top cover 2 is provided with the air guide cap 3, pressure hot air in the primary air chamber at the lower part of the coal mill is led out to the top cover, and coal dust in the inert area is blown away, so that the inert area in the center of the millstone seat is eliminated.
Specifically, referring to fig. 1, the pressurized hot air enters the medium speed coal mill 100 from the air inlet at the bottom, a primary air chamber is formed at the millstone seat of the medium speed coal mill 100, most of the pressurized hot air is blown into the mill from the nozzle annular gap around the millstone seat, the other part of the pressurized hot air enters the millstone seat body 1 through the air inlet 11 and is discharged through the air outlet 33 on the air guide cap 3, so that an airflow flowing outwards from the center of the millstone seat is formed, and the pulverized coal in the inert area is blown away.
Referring to fig. 2-3, the cap 31 is of a conical configuration. Because coal can fall on the planar cap body 31, the cap body 31 with the cone structure can not lead raw coal to fall on the cap body 31, and the impact of the raw coal can be reduced.
Referring to fig. 3, the upper side of the top cover 2 is provided at the middle thereof with an upward tapered surface 21, and a through hole 22 is provided at the middle of the tapered surface 21. The upper side surface of the top cover 2 is provided with an upward conical surface 21, so that raw coal particles can conveniently roll outwards.
Further, the lower side surface of the wind cap 3 is a concave surface, and a downward inclined wind guide channel 4 is formed between the lower side surface of the cap body 31 and the conical surface 21, so that the air flow blows the coal dust on the surface of the top cover 2.
Referring to fig. 2 and 4, the through hole 22 is provided with an internal thread, the lower end of the supporting ring 32 is provided with an extending ring 34, the extending ring 34 is provided with an external thread, and the hood 3 is in threaded connection with the through hole 22 through the extending ring 34. The structure is convenient for the installation of the wind cap and the maintenance and the replacement. Of course, the hood 3 may be welded directly to the top cover 2.
Referring to fig. 2 and 3, a disassembly blind hole 35 for screwing and disassembling the wind cap 3 is formed in the top of the cap body 31, so that disassembly and assembly are facilitated. The dismounting blind hole 35 can be a hexagonal blind hole and is dismounted through an inner hexagonal wrench; and the two symmetrical round blind holes are assembled and disassembled through a spanner with two fixing columns.
Further, in order to prevent dust and hot air from affecting the speed reducer below the millstone seat body 1, referring to fig. 2, a horizontal air guide pipe 12 and a vertical air guide pipe 14 are arranged in the millstone seat body 1, one end of the horizontal air guide pipe 12 is connected with the inner wall of the millstone seat body 1 and is communicated with the air inlet 11, the other end of the horizontal air guide pipe 12 is communicated with the lower end of the vertical air guide pipe 14, and the upper end of the vertical air guide pipe 14 is communicated with the through hole 22 of the top cover 2.
For easy installation, the connection between the vertical air guide pipe 14 and the top cover 2 is not welded, and the upper end of the vertical air guide pipe 14 is inserted into the through hole 22.
Further, in order to facilitate the connection of the vertical air guide pipe 14 and the plurality of horizontal air guide pipes 12, a wind collecting box 13 is installed at the lower end of the vertical air guide pipe 14, and the other end of the horizontal air guide pipe 12 is communicated with the wind collecting box 13.
Embodiment two:
referring to fig. 1, a medium speed coal pulverizer 100 is provided with a millstone base. Specifically, the millstone seat body 1 grinds and installs on the speed reducer output shaft of below through the bolt, is used for installing the millstone groove on the millstone seat body 1, and the grinding roller grinds the raw coal in the millstone groove. The connection of the millstone seat body 1 and the speed reducer is in the prior art, the millstone groove and the millstone roller are in the prior art, and the millstone groove is connected with the millstone seat body 1.
The working principle of the utility model is as follows:
the pressure hot air enters the medium-speed coal mill 100 from the air inlet at the bottom, a primary air chamber is formed at the millstone seat body 1 of the medium-speed coal mill 100, most of the pressure hot air is blown into the mill from the nozzle ring gaps around the millstone seat body 1, the other part of the pressure hot air enters the transverse air guide pipe 12 through the air inlet 11, then flows to the air guide cap 3 from the vertical air guide pipe 14, is discharged through the air outlet 33 on the air guide cap 3, and forms an inclined downward air guide channel 4 between the lower side surface of the cap body 31 and the conical surface 21, so that air flow flowing outwards from the center of the top cover 2 is formed, and coal dust in an inert area is blown away.
Claims (10)
1. The utility model provides a mill seat, includes mill seat body (1), top cap (2), its characterized in that are installed to mill seat body (1) upside: a plurality of air inlets (11) are formed in the circumferential wall of the millstone seat body (1), through holes (22) are formed in the middle of the top cover (2), an air guide cap (3) is arranged on the upper side of the top cover (2) at the position corresponding to the through holes (22), the air guide cap (3) comprises a cap body (31) and a supporting ring (32), the upper end of the supporting ring (32) is connected with the cap body (31), the lower end of the supporting ring is communicated with the through holes (22) of the top cover (2), a plurality of air outlets (33) are formed in the circumferential wall of the supporting ring (32), and an air guide channel (4) is formed between the lower side surface of the cap body (31) and the upper side surface of the top cover (2).
2. The millstone holder of claim 1, wherein: the cap body (31) is of a cone structure.
3. A millstone seat according to claim 1 or 2, characterized in that: the middle part of the upper side surface of the top cover (2) is provided with an upward conical surface (21), and the through hole (22) is arranged in the middle of the conical surface (21).
4. A millstone holder according to claim 3, characterized in that: the lower side surface of the wind guide cap (3) is a concave surface, and a downward inclined wind guide channel (4) is formed between the lower side surface of the cap body (31) and the conical surface (21).
5. The millstone holder of claim 1, wherein: the through hole (22) is provided with internal threads, the lower end of the supporting ring (32) is provided with an extending ring (34), the extending ring (34) is provided with external threads, and the air guide cap (3) is in threaded connection with the through hole (22) through the extending ring (34).
6. The millstone holder of claim 4, wherein: the top of the cap body (31) is provided with a disassembly blind hole (35) for screwing and disassembling the wind guide cap (3).
7. The millstone holder of claim 1, wherein: the grinding disc seat is characterized in that a transverse air guide pipe (12) and a vertical air guide pipe (14) are arranged in the grinding disc seat body (1), one end of the transverse air guide pipe (12) is connected with the inner wall of the grinding disc seat body (1) and communicated with the air inlet (11), the other end of the transverse air guide pipe (12) is communicated with the lower end of the vertical air guide pipe (14), and the upper end of the vertical air guide pipe (14) is communicated with a through hole (22) of the top cover (2).
8. The millstone holder of claim 7, wherein: the upper end of the vertical air guide pipe (14) is inserted into the through hole (22).
9. The millstone holder of claim 7, wherein: the air collecting box (13) is arranged at the lower end of the vertical air guide pipe (14), and the other end of the horizontal air guide pipe (12) is communicated with the air collecting box (13).
10. A medium speed coal mill (100), characterized by: a millstone holder according to claim 1 is provided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322033816.1U CN220514331U (en) | 2023-07-31 | 2023-07-31 | Millstone seat and medium-speed coal mill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322033816.1U CN220514331U (en) | 2023-07-31 | 2023-07-31 | Millstone seat and medium-speed coal mill |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220514331U true CN220514331U (en) | 2024-02-23 |
Family
ID=89936366
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322033816.1U Active CN220514331U (en) | 2023-07-31 | 2023-07-31 | Millstone seat and medium-speed coal mill |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220514331U (en) |
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2023
- 2023-07-31 CN CN202322033816.1U patent/CN220514331U/en active Active
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