CN210800070U - Sealing device on pull rod of roller disc type coal mill, pull rod of roller disc type coal mill and roller disc type coal mill - Google Patents
Sealing device on pull rod of roller disc type coal mill, pull rod of roller disc type coal mill and roller disc type coal mill Download PDFInfo
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- CN210800070U CN210800070U CN201921873735.XU CN201921873735U CN210800070U CN 210800070 U CN210800070 U CN 210800070U CN 201921873735 U CN201921873735 U CN 201921873735U CN 210800070 U CN210800070 U CN 210800070U
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- pull rod
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- roller disc
- coal mill
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Abstract
The utility model relates to a sealing device technical field provides a sealing device, roller disc coal pulverizer pull rod and roller disc coal pulverizer on roller disc coal pulverizer pull rod, sealing device includes along downward parallel arrangement's in proper order first board, second board and third board in the direction of height on the roller disc coal pulverizer pull rod, first board with the third board sets up to fixed, the second board respectively with first board with but third board sliding connection, first board with the third board all is equipped with spacing hole, the second board be equipped with pull rod clearance fit's draw rod hole, the aperture of draw rod hole is less than the aperture of spacing hole, the upper surface of second board is equipped with annular lug. The utility model discloses a sealing device on roller disc formula coal pulverizer pull rod is through setting up annular lug on the second plate, avoids debris direct and pull rod contact, avoids debris card between the sealing device on pull rod and roller disc formula coal pulverizer pull rod to it dies to cause the part card.
Description
Technical Field
The utility model relates to a sealing device technical field, in particular to sealing device, roller disc coal pulverizer pull rod and roller disc coal pulverizer on roller disc coal pulverizer pull rod.
Background
The roller disc type coal mill has the advantages of wide coal type adaptability, high milling efficiency, low power consumption, safety, reliability and the like, and is widely applied to industrial and mining enterprises such as thermal power generation, cement, coal and the like.
The grinding of the roller disc type coal mill consists of a rotating grinding disc and three grinding rollers, and the grinding loading force is transmitted by taking a pull rod as a medium. As an important part of the loading device, the pull rod is required to rotate along the axis while moving up, down, left and right freely, and the coal powder in the coal mill is ensured not to leak and pollute between the irregular movement of the pull rod and the static shell, so that the important environmental protection problem required to be solved by equipment manufacturers is solved.
At present, a pull rod sealing device commonly applied to a roller disc type coal mill is filled with sealing air in an internal cavity (also called a sealing cavity) so as to isolate coal dust from entering the cavity by clean high-pressure sealing air and prevent the coal dust at the position where a pull rod penetrates through a shaft from leaking. The two parts are arranged according to different functions, the pull rod lower sealing device is used for externally preventing pulverized coal and sealing wind from leaking, the pull rod upper sealing device is used for internally preventing pulverized coal from flowing backwards into a sealing cavity and is used as a first air sealing device contacting the pulverized coal, and the pull rod upper sealing device is particularly important.
When the existing upper sealing device of the pull rod is used, the upper sealing device is easy to accumulate sundries such as crushed coal, crushed stone and metal blocks to cause abrasion between the pull rod and a plane sliding block and block of the part, after the abrasion of a radial gap of the pull rod is increased, the high-speed scouring effect of sealing wind at the position is weakened, once the air seal isolation fails, the abrasion is intensified, the upper sealing device fails to cause pulverized coal and incidental sundries to enter a sealing cavity, the pulverized coal is scoured with dust, the lower seal damage is gradually caused, and finally the pulverized coal leaks out.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims at providing a sealing device, roller disc coal pulverizer pull rod and roller disc coal pulverizer on roller disc coal pulverizer pull rod to solve present sealing device and pile up debris easily on the pull rod, arouse wearing and tearing, the problem of part bite between pull rod and plane smooth block.
In order to achieve the above object, one aspect of the present invention provides a sealing device on a pull rod of a roller disc coal mill, comprising a first plate, a second plate and a third plate which are arranged in parallel in sequence along a height direction,
the first plate and the third plate are arranged to be stationary, the second plate is slidably connected to the first plate and the third plate, respectively,
the first plate and the third plate are both provided with limiting holes, the second plate is provided with pull rod holes in clearance fit with the pull rods, the aperture of each pull rod hole is smaller than that of each limiting hole, the projection of each pull rod hole on the third plate is positioned in each limiting hole,
the upper surface of the second plate is provided with an annular bump, the annular bump and the pull rod hole are coaxially arranged, the inner diameter of the annular bump is not larger than the aperture of the pull rod hole, and the outer diameter of the annular bump is gradually reduced downwards along the height direction.
Preferably, the first plate is fixedly connected with the third plate through a spacer block, and the height of the spacer block is greater than that of the second plate.
Preferably, the second plate is formed by detachably connecting at least two snap rings.
Preferably, the snap ring is rotationally symmetric.
Preferably, the aperture of the limiting hole on the first plate is larger than the aperture of the limiting hole on the third plate.
Preferably, the cross-sectional shape of the annular projection is a right triangle.
On the other hand, the utility model provides a roller disc coal pulverizer pull rod, including the pull rod with roller disc coal pulverizer pull rod on sealing device, the pull rod runs through spacing hole with draw bar hole and with draw bar hole clearance fit, the pull rod is close to one side of first board is equipped with the dust cover, dust cover detachably installs the periphery of pull rod.
Preferably, the dust cover is composed of at least two covers which are detachably connected.
Preferably, the dust cover is connected with the pull rod through the clamp.
Furthermore, the utility model provides a roller disc coal pulverizer pull rod, including the casing with the roller disc coal pulverizer pull rod, be equipped with on the casing with the airtight chamber of casing intercommunication, first board and/or the third board with airtight chamber fixed connection, the pull rod runs through the casing with airtight chamber.
Compared with the prior art, the upper sealing device of the pull rod of the roller disc type coal mill of the utility model has the advantages that the annular convex block is arranged on the second plate, so that sundries are prevented from directly contacting the pull rod, the abrasion of the pull rod or the upper sealing device of the pull rod of the roller disc type coal mill is avoided, and meanwhile, the sundries are prevented from being clamped between the pull rod and the upper sealing device of the pull rod of the roller disc type coal mill, so that the parts are prevented from being clamped; through setting up the external diameter of annular lug to reduce gradually along direction of height downwards, avoid the debris of annular lug upper surface to get into pull rod and roller disc coal pulverizer pull rod sealing device's clearance to improve pull rod and roller disc coal pulverizer pull rod sealing device's life.
Other features and advantages of the present invention will be described in detail in the detailed description which follows.
Drawings
The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. In the drawings:
fig. 1 is a cross-sectional view of the sealing device on the pull rod of the roller disc type coal mill of the present invention;
FIG. 2 is an exploded view of the sealing device on the pull rod of the roller disc type coal mill of the present invention;
fig. 3 is a perspective view of an embodiment of the snap ring of the present invention.
Description of reference numerals:
1 first plate 2 second plate
3 third plate 4 spacer
5 pull rod 6 dust cover
7 casing 8 airtight chamber
11 limiting hole 21 pull rod hole
22 annular projection 23 snap ring
61 hoop
Detailed Description
The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings. It is to be understood that the description of the embodiments herein is for purposes of illustration and explanation only and is not intended to limit the invention.
In the present invention, unless otherwise specified, the use of directional terms such as "upper, lower, left, and right" generally means upper, lower, left, and right as illustrated with reference to the accompanying drawings; "inner and outer" refer to the inner and outer relative to the profile of the components themselves. The present invention will be described in detail with reference to the accompanying drawings 1-2 in conjunction with embodiments.
According to one aspect of the present invention, there is provided a sealing device on a pull rod of a roller disc coal mill, as shown in fig. 1, the sealing device on a pull rod of a roller disc coal mill comprises a first plate 1, a second plate 2 and a third plate 3 which are arranged in parallel in sequence along a height direction, and the lower direction along the height direction means along a gravity direction,
the first plate 1 and the third plate 3 are arranged to be fixed, the first plate 1 and the third plate 3 are provided with a distance, and the second plate 2 is slidably connected with the first plate 1 and the third plate 3 respectively, preferably, the distance between the upper surface of the second plate 2 and the first plate 1 and the third plate 3 is 1mm-4mm, preferably, the distance between the upper surface of the second plate 2 and the first plate 1 and the third plate 3 is 2mm,
the first plate 1 and the third plate 3 are both provided with limiting holes 11, the second plate 2 is provided with pull rod holes 21 in clearance fit with the pull rods 5, the aperture of the pull rod hole 21 is smaller than that of the limiting hole 11, the projection of the pull rod hole 21 on the third plate 3 is positioned in the limiting hole 11,
the upper surface of the second plate 2 is provided with an annular bump 22, the annular bump 22 and the pull rod hole 21 are coaxially arranged, the inner diameter of the annular bump 22 is not greater than the aperture of the pull rod hole 21, preferably, the inner diameter of the annular bump 22 is equal to the aperture of the pull rod hole 21, and the outer diameter of the annular bump 22 is gradually reduced downwards along the height direction.
The upper sealing device of the roller disc type coal mill pull rod of the utility model avoids the sundries from directly contacting with the pull rod 5 by arranging the annular convex block 22 on the second plate 2, so as to cause the abrasion of the pull rod 5 or the upper sealing device of the roller disc type coal mill pull rod, and simultaneously, avoids the sundries from being clamped between the pull rod 5 and the upper sealing device of the roller disc type coal mill pull rod, thereby causing the blocking of parts; the outer diameter of the annular convex block 22 is set to be gradually reduced downwards along the height direction, so that sundries on the upper surface of the annular convex block 22 are prevented from entering a gap between the pull rod 5 and the sealing device on the pull rod of the roller disc type coal mill, and the service life of the pull rod 5 and the sealing device on the pull rod of the roller disc type coal mill is prolonged; but through second board 2 with first board 1 and third board 3 sliding connection respectively for pull rod 5 can drive the motion of second board 2, avoids pull rod 5 crooked.
In order to keep the distance between the first plate 1 and the third plate 3 fixed, the first plate 1 is fixedly connected with the third plate 3 through a spacer 4, the height of the spacer 4 is greater than the height of the second plate 2, preferably, the spacer 4 is detachably connected with the first plate 1 and the third plate 3, further, the spacer 4 is connected with the first plate 1 and the third plate 3 through bolts, preferably, the number of the spacers 4 is multiple, and the multiple spacers 4 are rotationally symmetrically arranged by taking a limiting hole 11 as an axis.
In order to facilitate the replacement of the second plate 2, said second plate 2 is composed of at least two snap rings 23 detachably connected, preferably bolted, as shown in fig. 3. Preferably, the number of the snap rings 23 is two.
In the above, the snap ring 23 is rotationally symmetrical, and this arrangement facilitates manufacture and installation of the snap ring 23.
In order to increase the radial movement amplitude of the pull rod 5, the aperture of the limiting hole 11 on the first plate 1 is larger than that of the limiting hole 11 on the third plate 3. This arrangement is such that the annular projection 22 does not interfere with the radial movement of the tie rod 5, preventing the tie rod 5 from bending and thus avoiding excessive wear of the tie rod 5.
In order to avoid the abrasion of the first plate 1 and the second plate 2, a plurality of soot blowing holes penetrating through the second plate 2 are formed in the second plate 2, the plurality of soot blowing holes are arranged around the pull rod hole 21, one end of each soot blowing hole is communicated with the limiting hole 11 in the third plate 3, and the other end of each soot blowing hole is communicated with the gap between the first plate 1 and the second plate 2, so that airtight air blown out of the airtight chamber 8 can pass through the soot blowing holes from the limiting holes 11 in the third plate 3 to reach the gap between the first plate 1 and the second plate 2, and therefore dust between the first plate 1 and the second plate 2 is removed, the abrasion of the first plate 1 and the second plate 2 is avoided, and the service life of the first plate 1 and the service life of the second plate 2 are prolonged.
In order to avoid the accumulation of impurities on the upper surface of the annular protrusion 22, the sectional shape of the annular protrusion 22 includes a right trapezoid or a right triangle, and preferably, the sectional shape of the annular protrusion 22 is a right triangle. Due to the arrangement, sundries are not easy to accumulate on the upper surface of the annular bump 22, so that the sundries are prevented from falling between the sealing device on the pull rod of the roller disc type coal mill and the pull rod 5, and the sealing device on the pull rod of the roller disc type coal mill is prevented from being abraded with the pull rod 5.
On the other hand, the utility model provides a roller disc coal pulverizer pull rod, including pull rod 5 with roller disc coal pulverizer pull rod on sealing device, pull rod 5 runs through spacing hole 11 with draw rod hole 21 and with draw rod hole 21 clearance fit, pull rod 5 is close to one side of first board 1 is equipped with conical dust cover 6, the one end detachably of dust cover 6 is installed the periphery of pull rod 5, the other end are the open end and towards first board 1, dust cover 6 sets up first board 1 the top and with there is the determining deviation in first board 1. In the above, the gap between the draw rod hole 21 and the outer periphery of the draw rod 5 is 0.3mm-1mm, and preferably, the gap between the draw rod hole 21 and the outer periphery of the draw rod 5 is 0.5mm, so that the flow velocity of the airtight air passing between the sealing device on the draw rod of the roller disc type coal mill and the draw rod 5 is increased, thereby improving the working quality of the airtight air.
In order to facilitate the installation and replacement of the dust cover 6, the dust cover 6 is formed by detachably connecting at least two cover bodies, and the detachable connection is a bolt connection.
Further, the dust cover 6 is connected to the tie bar 5 through the clamp 61.
Furthermore, the utility model provides a roller disc coal pulverizer, including casing 7 with the roller disc coal pulverizer pull rod, casing 7 be equipped with on with the airtight chamber 8 of casing 7 intercommunication, first board 1 and/or third board 3 with airtight chamber 8 fixed connection, pull rod 5 runs through casing 7 with airtight chamber 8. Preferably, the third plate 3 is fixedly connected to the airtight chamber 8.
Use during sealing device on roller disc coal pulverizer pull rod, airtight wind blows off through airtight chamber 8 to spacing hole 11 through third plate 3 is blown off by the clearance of second plate 2 and third plate 3, draw rod hole 21 and pull rod 5 respectively and the soot blowing hole, thereby reaches the purpose of atmoseal.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A sealing device on a pull rod of a roller disc type coal mill is characterized by comprising a first plate (1), a second plate (2) and a third plate (3) which are sequentially arranged in parallel downwards along the height direction,
the first plate (1) and the third plate (3) are arranged to be fixed, the second plate (2) is slidably connected with the first plate (1) and the third plate (3), respectively,
the first plate (1) and the third plate (3) are both provided with limiting holes (11), the second plate (2) is provided with pull rod holes (21) in clearance fit with the pull rods (5), the aperture of each pull rod hole (21) is smaller than that of each limiting hole (11), the projection of each pull rod hole (21) on the third plate (3) is positioned in each limiting hole (11),
the upper surface of the second plate (2) is provided with an annular bump (22), the annular bump (22) and the pull rod hole (21) are coaxially arranged, the inner diameter of the annular bump (22) is not larger than the aperture of the pull rod hole (21), and the outer diameter of the annular bump (22) is gradually reduced downwards along the height direction.
2. The sealing device on the pull rod of the roller disc type coal mill according to claim 1, characterized in that the first plate (1) is fixedly connected with the third plate (3) through a spacing block (4), and the height of the spacing block (4) is larger than that of the second plate (2).
3. The sealing device on the pull rod of the roller disc type coal mill according to claim 1, characterized in that the second plate (2) is formed by detachably connecting at least two snap rings.
4. The sealing device on a pull rod of a roller disc type coal mill as claimed in claim 3, wherein the snap ring is rotationally symmetric.
5. The sealing device on the pull rod of the roller disc type coal mill according to claim 1, characterized in that the aperture of the limiting hole (11) on the first plate (1) is larger than the aperture of the limiting hole (11) on the third plate (3).
6. The sealing device on the pull rod of the roller disc type coal mill as claimed in claim 1, wherein the cross-sectional shape of the annular projection (22) is a right triangle.
7. The roller disc type coal mill pull rod is characterized by comprising a pull rod (5) and the sealing device on the roller disc type coal mill pull rod of any one of claims 1 to 6, wherein the pull rod (5) penetrates through the limiting hole (11) and the pull rod hole (21) and is in clearance fit with the pull rod hole (21), a dust cover (6) is arranged on one side, close to the first plate (1), of the pull rod (5), and the dust cover (6) is detachably mounted on the periphery of the pull rod (5).
8. The roller disc coal mill pull rod according to claim 7, characterized in that the dust shield (6) is composed of at least two shields which are detachably connected.
9. The roller disc coal mill pull rod according to claim 7, characterized in that the dust shield (6) is connected with the pull rod (5) by a clamp.
10. A roller mill coal mill characterized by comprising a housing and a pull rod of the roller mill coal mill.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921873735.XU CN210800070U (en) | 2019-11-01 | 2019-11-01 | Sealing device on pull rod of roller disc type coal mill, pull rod of roller disc type coal mill and roller disc type coal mill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921873735.XU CN210800070U (en) | 2019-11-01 | 2019-11-01 | Sealing device on pull rod of roller disc type coal mill, pull rod of roller disc type coal mill and roller disc type coal mill |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210800070U true CN210800070U (en) | 2020-06-19 |
Family
ID=71230343
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921873735.XU Active CN210800070U (en) | 2019-11-01 | 2019-11-01 | Sealing device on pull rod of roller disc type coal mill, pull rod of roller disc type coal mill and roller disc type coal mill |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210800070U (en) |
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2019
- 2019-11-01 CN CN201921873735.XU patent/CN210800070U/en active Active
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