CN114321374B - Sealing device for grinding roller of vertical mill - Google Patents
Sealing device for grinding roller of vertical mill Download PDFInfo
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- CN114321374B CN114321374B CN202111671430.2A CN202111671430A CN114321374B CN 114321374 B CN114321374 B CN 114321374B CN 202111671430 A CN202111671430 A CN 202111671430A CN 114321374 B CN114321374 B CN 114321374B
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Abstract
The invention discloses a grinding roller sealing device of a vertical grinding mill, and belongs to the technical field of vertical grinding hermetic sealing. The rocker arm shaft, the grinding roller and the air sealing device are arranged between the rocker arm shaft and the grinding roller and surround to form a sealed first air chamber, the air sealing device comprises a sealing outer ring and a sealing inner ring, the sealing outer ring is arranged on the rocker arm shaft, the sealing inner ring is arranged on the grinding roller, a first annular gas jet opening which is communicated with the first air chamber and is in an annular long slit is formed between the sealing inner ring and the sealing outer ring, and gas is jetted outwards through the first annular gas jet opening so that external dust cannot enter the first air chamber; a first air inlet channel communicated with the first air chamber is arranged in the rocker arm shaft along the axial direction of the rocker arm shaft. The invention can increase a gap structure on the original air seal structure to form double-gap seal with the original air seal gap, thereby greatly improving the sealing effect.
Description
Technical Field
The invention relates to the technical field of vertical mill air sealing, in particular to a vertical mill grinding roller sealing device.
Background
The vertical mill is a drying and grinding device with excellent technical performance. When the vertical mill operates, because the grinding roller of the vertical mill operates in a high-temperature environment in which dust-containing gas and powder are in contact, the vertical mill is easy to damage, the workload of replacement and maintenance is large, the maintenance cost is high, the maintenance time is long, the grinding roller leaks oil, the bearing is damaged due to ash entering, the service life of the bearing of the grinding roller is prolonged, and the production of enterprises is directly influenced.
In the existing cement vertical mill, in order to protect the oil seal of the grinding roller from being polluted by high-temperature dust to damage the oil seal, an air cavity is generally constructed on the grinding roller and the rocker arm shaft, filtered air is pumped into the air cavity from an air passage in the rocker arm shaft, the air is sprayed out through an air gap between the grinding roller and the rocker arm shaft, and the high-temperature dust cannot enter to form air seal. The existing air seal also has a plurality of defects, firstly, irregular vibration is caused when the grinding roller of the vertical mill rolls, the size of a gap of an air gap can be changed when the irregular vibration is reflected to an air seal structure, low-pressure high-temperature dust is filled in the vertical mill, the change of the local area of the air gap is caused when the size of the gap of the air gap can be changed, the dust can enter, and the dust is gradually accumulated in a cavity to influence an oil seal between the grinding roller and a rocker arm shaft. Secondly, the dust can enter the air cavity due to unstable air pressure in the air cavity or unsmooth entering air. Therefore, how to enhance the existing airtight structure needs to be considered.
Disclosure of Invention
The invention aims to solve the problems and provides a sealing device for a grinding roller of a vertical mill, which can greatly improve the sealing effect by adding an air jet port with a gap structure which is not influenced by the vibration of the grinding roller on the original air sealing structure and forming double-gap sealing with the original air sealing gap.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a sealing device for a grinding roller of a vertical mill comprises a rocker arm shaft, the grinding roller and an air sealing device, wherein the air sealing device is arranged between the rocker arm shaft and the grinding roller and surrounds a first air chamber for forming sealing; a first air inlet channel communicated with the first air chamber is arranged in the rocker arm shaft along the axial direction of the rocker arm shaft; the method is characterized in that: the sealing outer ring is of a hollow structure and forms a second air chamber, the second air chamber is communicated with a second air inlet channel which is arranged on the rocker shaft and is arranged along the axial direction of the rocker shaft, a second annular air nozzle is arranged on the sealing outer ring at the position of the first annular air nozzle along the circumferential direction, the second annular air nozzle is arranged in a long slit which forms the first annular air nozzle, and the air injection direction of the second annular air nozzle is inclined to the air injection direction of the first annular air nozzle and forms an included angle of 5-30 degrees;
a heat exchange tube is arranged in a second air chamber in the sealed outer ring, the heat exchange tube is communicated with an air inlet end of the sealed outer ring, the air inlet end is connected with tertiary air of a rotary kiln grate cooler in the cement clinker calcining system through a pipeline, and a one-way circulation valve is arranged at a position where the second air chamber of the sealed outer ring is connected with a second air inlet channel; the space size of the second air chamber is reduced from large to small along the direction of the second annular air nozzle.
Preferably, the speed of the air ejected by the second annular air nozzle is not less than the speed of the air ejected by the first annular air nozzle.
Preferably, the air injection direction of the second annular air injection port is inclined to the air injection direction of the first annular air injection port and forms an included angle of 10-20 °.
Preferably, a third air chamber which is annularly arranged is further arranged on the sealing outer ring; the third air chamber and the second annular air nozzle are coaxially arranged and are respectively positioned between the second air chamber and the second annular air nozzle; one end of the third air chamber is communicated with one end of the second annular air jet; the other end of the third air chamber is communicated with the second air chamber.
Preferably, the second air chamber is spirally arranged, the heat exchange tubes are spirally arranged along the second air chamber, and the smaller end of the second air chamber is tangent to the third air chamber; the air inlet direction of the heat exchange tube is opposite to the air inlet direction of the second air chamber.
Preferably, a heat insulation layer is arranged at the position, close to the inner ring, of the sealing outer ring.
Preferably, a sliding seal formed by a graphite packing is arranged between the sealing inner ring and the rocker shaft.
Preferably, the sealing outer ring comprises a first sealing body and a second sealing body, and the first sealing body and the second sealing body are symmetrically arranged and can be correspondingly clamped into a whole; a sealing material is coated on a gap between the first sealing body and the second sealing body; the first sealing body and the second sealing body are respectively connected with the rocker shaft through bolts.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
1. according to the invention, the outer layer of the existing first annular air nozzle is also provided with a second annular air nozzle, specifically, the second annular air nozzle is arranged on the sealing outer ring, the direction of the second annular air nozzle forms an angle with the first annular air nozzle, so that the second annular air nozzle sprays air to form protection for the first annular air nozzle connected with the first air chamber, specifically, the second annular air nozzle sprays air which is larger than that of the first annular air nozzle, and negative pressure is formed at the first annular air nozzle, so that the first annular air nozzle can stably spray air when the air pressure is unstable, and the condition that dust enters from the first annular air nozzle due to the change of the air pressure is reduced.
2. In the invention, the tertiary air of the rotary kiln grate cooler in the cement clinker calcination system is introduced, so that the air is heated at high temperature before entering the second annular air jet, and is expanded; and utilize the second air chamber to follow the structure that second annular jet orifice direction is by diminishing greatly for the air can be compressed when passing through the second air chamber, and then makes and can spray high-speed air at second annular jet orifice, can greatly reduced dust take place because of the condition that atmospheric pressure changes and get into from first annular jet orifice with the cooperation of first annular jet orifice like this.
3. The invention provides a novel air sealing structure which can better protect an oil seal of a grinding roller.
Drawings
FIG. 1 is a block diagram of the functional module architecture of the system of the present invention.
Fig. 2 is a partially enlarged view a of fig. 1.
In the attached drawing, 1-rocker shaft, 2-grinding roller, 3-sealing outer ring, 4-sealing inner ring, 5-first air inlet channel, 6-second air inlet channel, 7-first air chamber, 8-first annular air jet, 9-second annular air jet, 10-second air chamber and 11-heat exchange tube.
Detailed Description
The following further describes the embodiments of the present invention with reference to the drawings.
As shown in figure 1, the invention discloses a sealing device for a grinding roller 2 of a vertical mill, which comprises a rocker shaft 1, the grinding roller 2 and an air sealing device. An air sealing device is arranged between the rocker shaft 1 and the grinding roller 2 and surrounds a first air chamber 7 forming a seal. The air sealing device comprises a sealing outer ring 3 and a sealing inner ring 4, wherein the sealing outer ring 3 is arranged on the rocker shaft 1, and the sealing inner ring 4 is arranged on the grinding roller 2; and a first annular gas nozzle 8 which is communicated with the first gas chamber 7 and is an annular long slit is formed between the sealing inner ring 4 and the sealing outer ring 3, and gas is jetted outwards through the first annular gas nozzle 8 so that external dust cannot enter the first gas chamber 7. A first air inlet channel 5 communicated with a first air chamber 7 is arranged in the rocker arm shaft 1 along the axial direction. The sealing outer ring 3 is of a hollow structure and forms a second air chamber 10, the second air chamber 10 is communicated with a second air inlet channel 6 which is arranged on the rocker arm shaft 1 and is arranged along the axial direction of the rocker arm shaft 1, a second annular air jet 9 is arranged on the sealing outer ring 3 and is positioned at the first annular air jet 8 along the circumferential direction, the second annular air jet 9 is positioned in a long slit which forms the first annular air jet 8, and the air jet direction of the second annular air jet 9 inclines towards the air jet direction of the first annular air jet 8 and forms an included angle of 5-30 degrees.
A heat exchange tube 11 is arranged in a second air chamber 10 in the sealed outer ring 3, the heat exchange tube 11 is communicated with an air inlet end of the sealed outer ring 3, the air inlet end is connected with tertiary air of a rotary kiln grate cooler in the cement clinker calcining system through a pipeline, and a one-way circulation valve is arranged at a position where the second air chamber 10 of the sealed outer ring 3 is connected with a second air inlet 6; the size of the space of the second air chamber 10 is reduced from large to small along the direction of the second annular air nozzle 9. Here, the tertiary air temperature is preferably not lower than 200 ℃ but may be maintained at 400 to 600 ℃. After the air enters the second air chamber 10, the air is subjected to heat exchange, so that the air is expanded and compressed by the second air chamber 10, and the speed of the air sprayed along the second annular air nozzle 9 is not less than that of the air sprayed by the first annular air nozzle 8.
In an advantageous embodiment, the direction of the gas injection from the second annular gas injection opening 9 is inclined to the direction of the gas injection from the first annular gas injection opening 8 and forms an angle of 10 to 20 °.
In order to ensure that the air flow is better transited between the second air chamber 10 and the second annular air jet opening 9, the second annular air jet opening 9 can uniformly jet air, and a third air chamber which is annularly arranged is arranged on the sealing outer ring 3; the third air chamber and the second annular air jet 9 are coaxially arranged and are respectively positioned between the second air chamber 10 and the second annular air jet 9; one end of the third air chamber is communicated with one end of the second annular air jet 9; the other end of the third air chamber is communicated with a second air chamber 10.
On the basis, the second air chamber 10 can be spirally arranged, the heat exchange tubes 11 are spirally arranged along the second air chamber 10, and the smaller end of the second air chamber 10 is tangent to the third air chamber; the air inlet direction of the heat exchange tube 11 is opposite to the air inlet direction of the second air chamber 10. So that the gas after heating in the spiral can be collected in the third gas chamber and ejected uniformly from the second annular gas ejection opening 9.
In order to reduce the thermal influence of the heat exchange of the second air chamber 10 on the sealing of the grinding roller 2, a heat insulation layer is arranged at the position, close to the inner ring, of the sealing outer ring 3.
Furthermore, a sliding seal formed by a graphite packing is arranged between the sealing inner ring 4 and the rocker arm shaft 1.
In order to improve the convenience of installation, the sealing outer ring 3 can comprise a first sealing body and a second sealing body which are symmetrically arranged and can be correspondingly clamped into a whole; a sealing material is coated on a gap between the first sealing body and the second sealing body; the first sealing body and the second sealing body are respectively connected with the rocker shaft 1 through bolts.
The above description is intended to describe in detail the preferred embodiments of the present invention, but the embodiments are not intended to limit the scope of the claims of the present invention, and all equivalent changes and modifications made within the technical spirit of the present invention should fall within the scope of the claims of the present invention.
Claims (8)
1. A sealing device for a grinding roller of a vertical mill comprises a rocker arm shaft, the grinding roller and an air sealing device, wherein the air sealing device is arranged between the rocker arm shaft and the grinding roller and surrounds a first air chamber for forming sealing; a first air inlet channel communicated with a first air chamber is arranged in the rocker arm shaft along the axial direction of the rocker arm shaft; the method is characterized in that: the sealing outer ring is of a hollow structure and forms a second air chamber, the second air chamber is communicated with a second air inlet channel which is arranged on the rocker shaft and is arranged along the axial direction of the rocker shaft, a second annular air nozzle is arranged on the sealing outer ring at the position of the first annular air nozzle along the circumferential direction, the second annular air nozzle is arranged in a long slit which forms the first annular air nozzle, and the air injection direction of the second annular air nozzle is inclined to the air injection direction of the first annular air nozzle and forms an included angle of 5-30 degrees;
a heat exchange tube is arranged in a second air chamber in the sealed outer ring, the heat exchange tube is communicated with an air inlet end of the sealed outer ring, the air inlet end is connected with tertiary air of a rotary kiln grate cooler in the cement clinker calcining system through a pipeline, and a one-way circulation valve is arranged at a position where the second air chamber of the sealed outer ring is connected with a second air inlet channel; the space size of the second air chamber is reduced along the direction of the second annular air jet.
2. A grinding roll sealing device for a vertical mill according to claim 1, wherein: the speed of the air ejected by the second annular air nozzle is not less than that of the air ejected by the first annular air nozzle.
3. A grinding roll sealing device for a vertical mill according to claim 1, wherein: the air injection direction of the second annular air injection port is inclined to the air injection direction of the first annular air injection port and forms an included angle of 10-20 degrees.
4. A grinding roll sealing device for a vertical mill according to claim 1, wherein: a third air chamber which is annularly arranged is also arranged on the sealing outer ring; the third air chamber and the second annular air nozzle are coaxially arranged and are respectively positioned between the second air chamber and the second annular air nozzle; one end of the third air chamber is communicated with one end of the second annular air jet; the other end of the third air chamber is communicated with the second air chamber.
5. A grinding roll sealing device for a vertical mill according to claim 4, wherein: the second air chamber is spirally arranged, the heat exchange tubes are spirally arranged along the second air chamber, and the smaller end of the second air chamber is tangent to the third air chamber; the air inlet direction of the heat exchange tube is opposite to the air inlet direction of the second air chamber.
6. A vertical grinding roll sealing apparatus according to claim 4, wherein: and a heat insulation layer is arranged at the position of the sealed outer ring close to the inner ring of the sealed outer ring.
7. A vertical grinding roll sealing apparatus according to claim 1, wherein: and a sliding seal formed by a graphite packing is arranged between the sealing inner ring and the rocker shaft.
8. A vertical grinding roll sealing apparatus according to claim 1, wherein: the sealing outer ring comprises a first sealing body and a second sealing body, and the first sealing body and the second sealing body are symmetrically arranged and can be correspondingly clamped into a whole; a sealing material is coated on a gap between the first sealing body and the second sealing body; the first sealing body and the second sealing body are respectively connected with the rocker shaft through bolts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111671430.2A CN114321374B (en) | 2021-12-31 | 2021-12-31 | Sealing device for grinding roller of vertical mill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111671430.2A CN114321374B (en) | 2021-12-31 | 2021-12-31 | Sealing device for grinding roller of vertical mill |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114321374A CN114321374A (en) | 2022-04-12 |
| CN114321374B true CN114321374B (en) | 2022-10-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111671430.2A Active CN114321374B (en) | 2021-12-31 | 2021-12-31 | Sealing device for grinding roller of vertical mill |
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| Country | Link |
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| CN (1) | CN114321374B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010144875A (en) * | 2008-12-19 | 2010-07-01 | Tanken Seal Seiko Co Ltd | Seal device for bearing |
| CN106246924A (en) * | 2016-08-29 | 2016-12-21 | 北京超同步伺服股份有限公司 | Split type air curtain protection device for machine tool chief axis |
| CN107366745A (en) * | 2016-05-12 | 2017-11-21 | 南京凯盛国际工程有限公司 | Novel vertical mill grinding-roll sealing device |
| CN207316129U (en) * | 2017-10-18 | 2018-05-04 | 西安昱昌环境科技有限公司 | A kind of self sealss RTO rotary valves |
| CN207454036U (en) * | 2017-11-29 | 2018-06-05 | 郑州荣奇热电能源有限公司 | Steam Turbine cylinder sream check device |
| CN109506298A (en) * | 2019-01-21 | 2019-03-22 | 广东美的制冷设备有限公司 | Heat exchanger assembly, air conditioner indoor unit and air conditioner |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102014100651B4 (en) * | 2014-01-21 | 2015-08-13 | Paperchine Gmbh | Air sealing device for a spraying apparatus in a papermaking machine |
-
2021
- 2021-12-31 CN CN202111671430.2A patent/CN114321374B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010144875A (en) * | 2008-12-19 | 2010-07-01 | Tanken Seal Seiko Co Ltd | Seal device for bearing |
| CN107366745A (en) * | 2016-05-12 | 2017-11-21 | 南京凯盛国际工程有限公司 | Novel vertical mill grinding-roll sealing device |
| CN106246924A (en) * | 2016-08-29 | 2016-12-21 | 北京超同步伺服股份有限公司 | Split type air curtain protection device for machine tool chief axis |
| CN207316129U (en) * | 2017-10-18 | 2018-05-04 | 西安昱昌环境科技有限公司 | A kind of self sealss RTO rotary valves |
| CN207454036U (en) * | 2017-11-29 | 2018-06-05 | 郑州荣奇热电能源有限公司 | Steam Turbine cylinder sream check device |
| CN109506298A (en) * | 2019-01-21 | 2019-03-22 | 广东美的制冷设备有限公司 | Heat exchanger assembly, air conditioner indoor unit and air conditioner |
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| CN114321374A (en) | 2022-04-12 |
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