CN105422864B - The sealing structure and coal pulverizer of coal pulverizer - Google Patents
The sealing structure and coal pulverizer of coal pulverizer Download PDFInfo
- Publication number
- CN105422864B CN105422864B CN201511024591.7A CN201511024591A CN105422864B CN 105422864 B CN105422864 B CN 105422864B CN 201511024591 A CN201511024591 A CN 201511024591A CN 105422864 B CN105422864 B CN 105422864B
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- sealing
- coal
- main shaft
- coal pulverizer
- sealing air
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/40—Sealings between relatively-moving surfaces by means of fluid
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/44—Free-space packings
- F16J15/447—Labyrinth packings
- F16J15/4472—Labyrinth packings with axial path
Abstract
The present invention relates to coal pulverizer technical field, the sealing structure and coal pulverizer of a kind of coal pulverizer are disclosed.The sealing structure of the coal pulverizer includes coal pulverizer housing, main shaft and the mill being arranged on the main shaft, the sealing structure also includes the annular canister and gear coal cylinder around main shaft arrangement, the annular canister is connected to the lower surface of mill, the gear coal cylinder is arranged on the coal pulverizer housing, the upper end of the gear coal cylinder is extend into the annular canister so that form sealing air gap between two barrel superpositions and two barrels；The sealing air chamber that can be communicated with outside sealing wind regime is formed between the gear coal cylinder and the main shaft; so that the sealing air in the sealing air chamber is flowed out by the sealing air gap; pebble coal and coal dust can thoroughly be prevented near main shaft; so as to protect the sealing device of coal pulverizer from the abrasion of pebble coal and coal dust, sealing effectiveness is improve.
Description
Technical field
The present invention relates to coal pulverizer technical field, in particular it relates to a kind of sealing structure of coal pulverizer, and a kind of coal-grinding
Machine.
Background technology
Current thermal power plant configuration medium-speed pulverizer is relatively more, and wherein MPS medium-speed pulverizers occupation rate is more.MPS grinds
The mill of coal machine is sealed with two kinds of patterns, and one kind is labyrinth sealing, a kind of for carbon ring is sealed.
For example, in the labyrinth mechanical seal structure of MPS200 coal pulverizers, there is sealing between labyrinth seal and main shaft
Air channel, ideally, the labyrinth seal can reach the life-span very long.But in actual motion, due to by sealing blast
Power, coal pulverizer return the influence of water etc., and inevitably labyrinth seal inside can enter pebble coal etc..And with the increasing of run time
Plus, there is different degrees of abrasion in labyrinth seal so that sealing air flue increases, when sealing air flue cannot set up sealing wind pressure
When, one side coal dust is leaked outside pollution environment by sealing air flue, on the other hand more aggravation pebble coal into sealing air flue leading
Cause abrasion faster.Labyrinth seal must be changed when serious wear.For MPS coal pulverizers, labyrinth seal workload is changed non-
Chang Ju great could install labyrinth seal, it is necessary to reductor is all removed with upper-part, equal to reinstalling a coal pulverizer,
Cause the construction period more long.
In addition, the base sealing that MPS coal pulverizers also have a kind of other sealing structures, i.e. MPS coal pulverizers is generally used
The ZGM medium-speed pulverizers of carbon ring seal, such as Beijing electric power instrument factory production.This sealing structure maintenance gets up more convenient,
General replacement carbocyclic ring is or so 8 hours.But, carbocyclic ring is consumable accessory, installs careless, is easily caused fracture.In addition, carbocyclic ring is
Vulnerable part, needs to change once for 1 year, and a set of carbocyclic ring probably needs 40,000 or so, and operating cost is higher.
The content of the invention
It is an object of the invention to provide a kind of sealing structure of coal pulverizer, the sealing structure of the coal pulverizer can be prevented thoroughly
Pebble coal and coal dust, so as to protect the sealing device of coal pulverizer from the abrasion of pebble coal and coal dust, improve close near main shaft
Envelope effect.
To achieve these goals, the present invention provides a kind of sealing structure of coal pulverizer, the sealing structure bag of the coal pulverizer
Coal pulverizer housing, main shaft and the mill being arranged on the main shaft are included, the sealing structure is also included around main shaft arrangement
Annular canister and gear coal cylinder, wherein, the annular canister is connected to the lower surface of mill, and the gear coal cylinder is arranged on the coal pulverizer
On housing, the upper end of the gear coal cylinder is extend into the annular canister so that shape between two barrel superpositions and two barrels
Into sealing air gap；The sealing air that can be communicated with outside sealing wind regime is formed between the gear coal cylinder and the main shaft
Chamber so that the sealing air in the sealing air chamber is flowed out by the sealing air gap.
By the technical scheme, the lower surface of mill is connected to due to annular canister, and keeps off coal cylinder and be arranged on coal pulverizer housing
On, and keep off the upper end of coal cylinder and extend into annular canister so that it is formed with sealing between the superposition of two barrels and two barrels
Wind gap so that the sealing air in sealing air chamber between gear coal cylinder and main shaft can be flowed out by the sealing air gap, so,
By annular canister and gear coal cylinder, first, pebble coal and coal dust can't move up through sealing air under self gravitation effect,
Gap is entered into sealing air chamber, simultaneously as the sealing air in sealing air chamber is flowed out by the sealing air gap, so as at this
In the presence of sealing air-flow, pebble coal and coal dust will not be more entered into sealing air chamber, so, in pebble coal and the gravity of coal dust
Under effect and the double effect of sealing air, pebble coal and coal dust can't be entered into sealing air chamber such that it is able to thoroughly anti-
Only pebble coal and coal dust, to protect the sealing device of coal pulverizer from the abrasion of pebble coal and coal dust, improve close near main shaft
Envelope effect.
Further, it is formed with the gear coal cylinder and extends close to the main shaft and form annular space and the main shaft between
Ring baffle, the inner space of the gear coal cylinder is divided into the sealing air chamber and the appearance of bottom on top by the ring baffle
Receive chamber.
Further, the lip ring around the main shaft, the lip ring are provided with the ring baffle
Inner peripheral surface and the outer peripheral face of the main shaft between formed contact sealing.
Further, the lip ring is made up of multiple fan-shaped seal sections.
Further, each described seal section can radially adjust position on the ring baffle relative to the main shaft
Put.
Further or selectively, the sealing structure also includes labyrinth seal, and the labyrinth seal is located at
In the accommodating chamber and be fixedly connected on the coal pulverizer housing, be formed with and the outer peripheral face of the main shaft between can with it is outer
The labyrinth seal passage that the sealing wind regime in portion is communicated；The sealing air chamber is by the annular space and the labyrinth seal passage
Communicate.
Further or selectively, the sealing structure also includes labyrinth seal, and the labyrinth seal is located at
In the accommodating chamber and be fixedly connected on the coal pulverizer housing, be formed with and the outer peripheral face of the main shaft between can with it is outer
The labyrinth seal passage that the sealing wind regime in portion is communicated；By the lip ring and the annular space, the sealing air chamber
Communicated with the labyrinth seal passage.
Further, be formed with cushion chamber in the labyrinth seal, the cushion chamber can by the opening of itself with
Outside sealing wind regime is communicated；The labyrinth seal passage is divided into upper sealing passage and lower sealing passage by the cushion chamber, wherein,
The upper sealing passage and the sealing air chamber communicate.
Further or selectively, the lower end of the gear coal cylinder is connected in the coal pulverizer housing bottom surface so that institute
State coal pulverizer housing, the annular canister and the gear coal cylinder and be collectively forming coal breakage chamber.
In addition, the present invention also provides a kind of coal pulverizer, the coal pulverizer includes the sealing knot of above-described coal pulverizer
Structure.
Other features and advantages of the present invention will be described in detail in subsequent specific embodiment part.
Brief description of the drawings
Accompanying drawing is, for providing a further understanding of the present invention, and to constitute the part of specification, with following tool
Body implementation method is used to explain the present invention together, but is not construed as limiting the invention.In the accompanying drawings：
Fig. 1 is the partial structural diagram of the coal pulverizer that the specific embodiment of the invention is provided, wherein, it is shown that the present invention
Coal pulverizer sealing structure；
Fig. 2 is the mplifying structure schematic diagram of the circle III in Fig. 1；
Fig. 3 is the mplifying structure schematic diagram of the circle II in Fig. 1；
Fig. 4 is a kind of structural representation of the lip ring in Fig. 3；
Fig. 5 is the mplifying structure schematic diagram of the seal section in Fig. 4；
Fig. 6 is the mplifying structure schematic diagram of the circle I in Fig. 1.
Description of reference numerals
1- coal pulverizer housings, 2- main shafts, 3- mills, 4- annular canisters, 5- gear coal cylinders, 6- sealing airs gap, 7- sealing airs chamber,
8- annular spaces, 9- ring baffles, 10- accommodating chambers, 11- lip rings, 12- seal sections, 13- labyrinth seals, 14- labyrinths
Sealing passage, seals on 14a- and seal under passage, 14b- passage, 15- cushion chambers, 16- openings, 17- coal breakage chambers, 18- regulations
Hole.
Specific embodiment
Specific embodiment of the invention is described in detail below in conjunction with accompanying drawing.It should be appreciated that this place is retouched
The specific embodiment stated is merely to illustrate and explain the present invention, and is not intended to limit the invention.
As illustrated in fig. 1 and 2, the sealing structure of coal pulverizer of the invention includes coal pulverizer housing 1, main shaft 2 and mill 3, its
In, mill 3 is arranged on main shaft 2, also, the sealing structure of coal pulverizer of the invention also includes annular canister 4 and gear coal cylinder 5, ring
Shape cylinder 4 and gear coal cylinder 5 surround main shaft 2 and arrange, wherein, annular canister 4 is connected to the lower surface of mill 3, and gear coal cylinder 5 is arranged on coal-grinding
On casing body 1, the upper end of gear coal cylinder 5 is extend into annular canister 4 so that form close between two barrel superpositions and two barrels
Envelope wind gap 6；The sealing air chamber 7 that can be communicated with outside sealing wind regime is formed between gear coal cylinder 5 and main shaft 2 so that close
Sealing air in envelope wind chamber 7 is flowed out by sealing air gap 6.
Sealing air gap 6 is preferably 3mm gaps.
In the technical scheme, the lower surface of mill 3 is connected to due to annular canister 4, and keeps off coal cylinder 5 and be arranged on coal pulverizer housing
On 1, and keep off the upper end of coal cylinder 5 and extend into annular canister 4 so that be formed between the superposition of two barrels and two barrels close
Envelope wind gap 6, such as Fig. 2 is clearly illustrated so that the sealing air in sealing air chamber 7 between gear coal cylinder 5 and main shaft 2 can pass through
The sealing air gap 6 is flowed out, and so, by annular canister 4 and gear coal cylinder 5, first, pebble coal and coal dust are under self gravitation effect,
Sealing air gap 6 can't be moved up through to enter into sealing air chamber 7, simultaneously as the sealing air in sealing air chamber 7 leads to
Cross the sealing air gap 6 to flow out, so as in the presence of the sealing air-flow, pebble coal and coal dust will not more enter into sealing air chamber
In 7, so, under the double effect of the Action of Gravity Field and sealing air of pebble coal and coal dust, pebble coal and coal dust can't enter
Enter in sealing air chamber such that it is able to thoroughly prevent pebble coal and coal dust near main shaft, exempted from the sealing device for protecting coal pulverizer
Worn and torn by pebble coal and coal dust, improve sealing effectiveness.
Further, as illustrated in fig. 1 and 2, it is formed with gear coal cylinder 5 and extends close to main shaft 2 and formed and the main shaft 2 between
The ring baffle 9 of annular space 8, the ring baffle 9 will keep off coal cylinder 5 inner space be divided into the sealing air chamber 7 on top and under
The accommodating chamber 10 in portion.Now, sealing air chamber 7 directly can communicate with outside sealing wind regime, for example, the sealing wind regime of outside leads to
Piping is passed directly in sealing air chamber 7 so that a part of sealing air flows out from sealing air gap 6 upwards, and another part is close
Flowed out from annular space 8 under envelope wind direction.Or, sealing air chamber 7 can be by annular space 8 and outside sealing wind regime phase
Logical, for example, sealing air can be passed through to accommodating chamber 10, now, sealing air flows upwards through annular space 8 and enters sealing air chamber
In 7, and continue up flowing flowed out from sealing air gap 6.
Further, in order to ensure by the sealing wind pressure of annular space 8, and further prevent coal dust from passing through annular
Interval 8, it is preferable that as shown in figs. 1 and 3, the lip ring 11 around main shaft 2, the ring packing are provided with ring baffle 9
Between the inner peripheral surface of part 11 and the outer peripheral face of main shaft 2 formed contact sealing, so, sealing air chamber 7 can directly and outside
In the case of sealing wind regime is communicated, outside sealing wind regime is passed directly in sealing air chamber 7 by pipeline so that a part of close
Flowed out from sealing air gap 6 on envelope wind direction, contact sealing of another part sealing air between lip ring 11 and main shaft 2 is logical
Cross and flowed out from annular space 8 downwards.Or, can be communicated with the sealing wind regime of outside by annular space 8 in sealing air chamber 7
In the case of, sealing air can be passed through to accommodating chamber 10, now, sealing air flows upwards through annular space 8 and by described
Contact sealing enter in sealing air chamber 7, and continue up flowing and flowed out from sealing air gap 6.
Further, for the ease of the assembling and replacing of lip ring 11, it is preferable that as shown in Figures 4 and 5, annular is close
Sealing 11 is made up of multiple fan-shaped seal sections 12, for example, in assembling, can cause the inner peripheral surface of each seal section 12 with
The outer peripheral face contact of main shaft 2, and gap can be remained between seal section 12, to be adjusted.Further, in reality
When using, the seal section 12 of lip ring 11 will wear and tear and main shaft 2 between so that gap enlargement between the two, because
This, in order to keep the contact between lip ring 11 and main shaft 2 to seal, as shown in Figures 4 and 5, each seal section 12 is in annular
Can be relative to the radial direction adjustment position of main shaft 2, for example, being formed with the groove profile for radially extending on each seal section 12 on baffle plate 9
Adjustment hole 18, so, each seal section 12 by connector such as screw or can be bolted on ring baffle 9, such as Fig. 3
It is shown, when adjustment is needed, screw or bolt are unclamped, and position needed for seal section 12 is arrived is moved radially inwardly, and then tighten
Screw or bolt are fastened.
Further, in order to protect main shaft 2 not to be worn, it is preferable that lip ring 11 is formed as copper ring, more preferably
Manufactured using red copper, so, due to the hardness of the hardness less than main shaft of red copper, can well ensure the durability of main shaft 2, and
Copper ring can carry out radiai adjustment after there is abrasion.When the regulation remaining that copper ring may wear to adjustment hole 18 is not enough, you can change
New copper ring, and other apparatus structures need not then be changed.
In addition, in the structure type with annular space 8, the sealing structure of coal pulverizer of the invention also includes labyrinth
Seal 13, wherein, as shown in figure 1, labyrinth seal 13 is located in accommodating chamber 10 and is fixedly connected on coal pulverizer housing 1, with
The labyrinth seal passage 14 that can be communicated with outside sealing wind regime is formed with and the outer peripheral face of main shaft 2 between；Meanwhile, sealing air
Chamber 7 is communicated by annular space 8 and labyrinth seal passage 14, so, as shown in figure 1, the sealing that the sealing wind regime of outside is provided
Wind first passes through labyrinth seal passage 14 and flows up and down, to keep the clean of the outer peripheral face of main shaft 2, prevents coal dust from sticking to
On the outer peripheral face of main shaft 2, meanwhile, the sealing air for flowing up is entered into sealing air chamber 7 by annular space 8, and continue to
Upper flowing, finally flows out from sealing air gap 6, prevents the coal dust outside sealing air chamber 7 from entering into sealing air chamber 7.
Certainly, as described above, it is as shown in figs. 1 and 3, of the invention in the structure type with lip ring 11
Sealing structure also includes labyrinth seal 13, and now, labyrinth seal 13 is located in accommodating chamber 10 and is fixedly connected on coal-grinding
Casing body 1, to be formed with the labyrinth seal passage 14 that can be communicated with outside sealing wind regime and the outer peripheral face of main shaft 2 between；
Meanwhile, by lip ring 11 and annular space 8, sealing air chamber 7 and labyrinth seal passage 14 are communicated, so, such as Fig. 1 institutes
Show, the sealing air that outside sealing wind regime is provided first passes through labyrinth seal passage 14 and flows up and down, to keep main shaft 2
Outer peripheral face it is clean, prevent coal dust from sticking on the outer peripheral face of main shaft 2, meanwhile, the sealing air for flowing up pass through annular space
8th, the contact between the outer peripheral face of the inner peripheral surface of lip ring 11 and main shaft 2 is sealed and entered into sealing air chamber 7, and after
It is continuous to flow up, finally flowed out from sealing air gap 6, prevent the coal dust outside sealing air chamber 7 from entering into sealing air chamber 7, and
It is prevented from the case of meaning or just in case enters between lip ring 11 and main shaft 2 into the coal dust in sealing air chamber 7
Enter to abrasion is caused in labyrinth seal passage 14 to labyrinth seal 13, so, labyrinth seal 13 can't with pebble coal with
And coal dust contact, abrasion is reduced to minimum, meanwhile, vibration that coal pulverizer is produced in operation, returning water, also not affect labyrinth close
Labyrinth seal between sealing 13 and main shaft 2 such that it is able to significantly increase the durability of labyrinth seal 13.
In any structure of both the above structure, as shown in figure 1, being formed with cushion chamber 15 in labyrinth seal 13, delay
Rushing chamber 15 can be communicated by the opening 16 of itself with outside sealing wind regime, and cushion chamber 15 passes through open ports by labyrinth seal passage
14 points is upper sealing passage 14a and lower sealing passage 14b, wherein, upper sealing passage 14a and sealing air chamber 7 communicate, and so, delay
Rushing chamber 15 can accumulate a certain amount of sealing air, and be easier to be sent to sealing air towards the open ports of main shaft 2 by it
Sealing passage 14a and lower sealing passage 14b.
Additionally, as shown in figure 1, the lower end of gear coal cylinder 5 is connected on the bottom surface of coal pulverizer housing 1 so that coal pulverizer housing 1,
Annular canister 4 and gear coal cylinder 5 are collectively forming coal breakage chamber 17, so, existing coal pulverizer structure will not be changed substantially, are transported in production
There are a large amount of raw coal in row, on mill, coal dust is rolled into by grinding roller, as shown in the arrow in upper left in Fig. 1, First air leads to
Cross nozzle and flow up and coal dust is carried to separator carries out subsequent treatment, and be difficult to the pebble coal for grinding then such as upper left in Fig. 1
Shown in arrow under direction, drop into the coal breakage chamber 17, coal-grinding is then scraped by the scraper plate of the lower section of coal breakage chamber 17
Outside machine, in addition, then preventing coal dust from entering into sealing air chamber 7 by sealing air gap 6.
Additionally, the present invention also provides a kind of coal pulverizer, wherein, the coal pulverizer includes the close of above-described coal pulverizer
Seal structure.
The preferred embodiment of the present invention is described in detail above in association with accompanying drawing, but, the present invention is not limited to above-mentioned reality
The detail in mode is applied, in range of the technology design of the invention, various letters can be carried out to technical scheme
Monotropic type, these simple variants belong to protection scope of the present invention.
It is further to note that each particular technique feature described in above-mentioned specific embodiment, in not lance
In the case of shield, can be combined by any suitable means.In order to avoid unnecessary repetition, the present invention to it is various can
The combination of energy is no longer separately illustrated.
Additionally, can also be combined between a variety of implementation methods of the invention, as long as it is without prejudice to originally
The thought of invention, it should equally be considered as content disclosed in this invention.
Claims (7)
1. a kind of sealing structure of coal pulverizer, including coal pulverizer housing (1), main shaft (2) and the mill being arranged on the main shaft (2)
Disk (3), it is characterised in that the sealing structure also includes the annular canister (4) and gear coal cylinder (5) around the main shaft (2) arrangement,
Wherein, the annular canister (4) is connected to the lower surface of mill (3), and gear coal cylinder (5) is arranged on the coal pulverizer housing
(1) on, the upper end of gear coal cylinder (5) is extend into the annular canister (4) so that two barrels superpositions and two barrels it
Between formed sealing air gap (6)；
The sealing air chamber that can be communicated with outside sealing wind regime is formed between gear coal cylinder (5) and the main shaft (2)
(7) so that the sealing air in the sealing air chamber (7) is flowed out by the sealing air gap (6)；
Wherein, it is formed with gear coal cylinder (5) and extends close to the main shaft (2) and and the main shaft (2) between formation annular
Every the ring baffle (9) of (8), the inner space of gear coal cylinder (5) is divided into the ring baffle (9) sealing on top
Wind chamber (7) and the accommodating chamber (10) of bottom；
Also, the sealing structure also includes labyrinth seal (13),
The labyrinth seal (13) is in the accommodating chamber (10) and is fixedly connected on the coal pulverizer housing (1), with
The labyrinth seal passage (14) that can be communicated with outside sealing wind regime is formed between the outer peripheral face of the main shaft (2)；
The sealing air chamber (7) is communicated by the annular space (8) and the labyrinth seal passage (14).
2. the sealing structure of coal pulverizer according to claim 1, it is characterised in that be provided with the ring baffle (9)
Around the lip ring (11) of the main shaft (2), the inner peripheral surface of the lip ring (11) and the outer peripheral face of the main shaft (2)
Between formed contact sealing.
3. the sealing structure of coal pulverizer according to claim 2, it is characterised in that the lip ring (11) is by more
Individual fan-shaped seal section (12) composition.
4. the sealing structure of coal pulverizer according to claim 3, it is characterised in that each described seal section (12) is described
Can be relative to the main shaft (2) radial direction adjustment position on ring baffle (9).
5. the sealing structure of coal pulverizer according to claim 1, it is characterised in that formed in the labyrinth seal (13)
There is cushion chamber (15), the cushion chamber (15) can be communicated by the opening (16) of itself with outside sealing wind regime；
The labyrinth seal passage (14) is divided into upper sealing passage (14a) and lower sealing passage (14b) by the cushion chamber (15),
Wherein, upper sealing passage (14a) and the sealing air chamber (7) communicate.
6. the sealing structure of coal pulverizer according to claim 1, it is characterised in that the lower end connection of gear coal cylinder (5)
On coal pulverizer housing (1) bottom surface so that the coal pulverizer housing (1), the annular canister (4) and gear coal cylinder (5)
It is collectively forming coal breakage chamber (17).
7. a kind of coal pulverizer, it is characterised in that the coal pulverizer includes the mill according to any one in claim 1-6
The sealing structure of coal machine.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201511024591.7A CN105422864B (en) | 2015-12-30 | 2015-12-30 | The sealing structure and coal pulverizer of coal pulverizer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201511024591.7A CN105422864B (en) | 2015-12-30 | 2015-12-30 | The sealing structure and coal pulverizer of coal pulverizer |
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| CN105422864B true CN105422864B (en) | 2017-07-04 |
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| CN108339655B (en) * | 2018-02-23 | 2023-06-30 | 北京蓝爱迪电力技术有限公司 | Rotary nozzle structure of medium-speed coal mill |
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| CN205226380U (en) * | 2015-12-30 | 2016-05-11 | 神华集团有限责任公司 | Seal structure and coal pulverizer of coal pulverizer |
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|---|---|---|---|---|
| CN101125305A (en) * | 2007-09-21 | 2008-02-20 | 沈阳重型机械集团有限责任公司 | Vertical roller mill hot flow chamber sealing device |
| CN201510921U (en) * | 2009-09-04 | 2010-06-23 | 郭瑜 | Coal mill slag chamber dynamic sealing structure |
| CN201664626U (en) * | 2009-09-04 | 2010-12-08 | 郭瑜 | Sealing structure for cinder chamber of coal mill |
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| Publication number | Publication date |
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| CN105422864A (en) | 2016-03-23 |
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