CN108837890B - Vertical roller mill millstone structure and manufacturing method - Google Patents
Vertical roller mill millstone structure and manufacturing method Download PDFInfo
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- CN108837890B CN108837890B CN201810948111.3A CN201810948111A CN108837890B CN 108837890 B CN108837890 B CN 108837890B CN 201810948111 A CN201810948111 A CN 201810948111A CN 108837890 B CN108837890 B CN 108837890B
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 25
- 210000000883 ear external Anatomy 0.000 claims abstract description 26
- 210000003027 ear inner Anatomy 0.000 claims abstract description 23
- 239000000463 material Substances 0.000 claims abstract description 15
- 238000005266 casting Methods 0.000 claims abstract description 9
- 238000007790 scraping Methods 0.000 claims abstract description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 16
- 239000010959 steel Substances 0.000 claims description 16
- 239000004576 sand Substances 0.000 claims description 12
- 238000003466 welding Methods 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 9
- 238000012545 processing Methods 0.000 claims description 9
- 239000003638 chemical reducing agent Substances 0.000 claims description 8
- 238000007528 sand casting Methods 0.000 claims description 7
- 230000000903 blocking effect Effects 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 6
- 238000000465 moulding Methods 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 4
- 229910052739 hydrogen Inorganic materials 0.000 claims description 3
- 239000001257 hydrogen Substances 0.000 claims description 3
- 238000010583 slow cooling Methods 0.000 claims description 3
- 238000005496 tempering Methods 0.000 claims description 3
- 230000009471 action Effects 0.000 abstract description 5
- 238000003754 machining Methods 0.000 abstract description 4
- 230000007774 longterm Effects 0.000 abstract description 3
- 239000013585 weight reducing agent Substances 0.000 abstract description 3
- 230000035882 stress Effects 0.000 description 3
- 229910001018 Cast iron Inorganic materials 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000009659 non-destructive testing Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
- B02C15/003—Shape or construction of discs or rings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Mechanical Engineering (AREA)
- Crushing And Grinding (AREA)
Abstract
The invention relates to a grinding disc structure of a vertical roller mill, which comprises an upper grinding disc body, a scraping plate positioning ring, a middle supporting body and a lower grinding disc body; the upper millstone body, the middle supporting body and the lower millstone body are welded into a whole; the centers of the upper millstone body, the middle supporting body and the lower millstone body are positioned on the same axis; the outer circumferential wall of the middle support body is welded with a scraping plate positioning ring, and an external ear plate is welded at the joint of the upper grinding disc body and the middle support body; an inner ear plate is welded at the joint of the middle support body and the upper grinding disc body. The invention also discloses a manufacturing method of the vertical roller mill disc structure, and the weight reduction can be realized under the condition that the bearing capacity of the mill disc is not reduced, so that the cost input of vertical mill equipment is reduced; the whole manufacturing process is not limited by casting and machining capacity any more, so that the phenomena that the grinding disc is easy to generate fatigue damage and crack under the action of alternating load and impact are effectively avoided, the stable material layer formed on the grinding disc by materials is well ensured, and the long-term stable normal operation of the vertical mill is ensured.
Description
Technical Field
The invention belongs to the technical field of vertical roller mill manufacturing, and particularly relates to a grinding disc structure of a vertical roller mill and a manufacturing method.
Background
The vertical mill is an energy-saving grinding device widely applied to the industries of nonmetallic ores, electric power, steel and the like at present. The vertical mill generally uses a flat grinding disc and a conical grinding roller, raw material grinding is carried out in a gap between the rotating grinding disc and the grinding roller, and the grinding disc of the vertical roller mill is one of the parts which mainly participate in grinding; the grinding roller applies downward positive pressure to the materials on the grinding disc under the action of the crank arm connecting rod mechanism, and grinds the materials; the grinding disc bears all grinding force from the grinding roller, and the grinding force is transmitted to the speed reducer through the grinding disc and then is transmitted to the concrete foundation; meanwhile, the grinding disc also bears the output torque of the speed reducer, so the grinding disc is a key stress and working part in the vertical roller mill.
The working principle and the complex working condition of the vertical mill determine that the millstone mainly bears the grinding force of low-speed alternating heavy load and the thermal stress of hot air from the fluidized bed furnace, wherein the fluidized bed furnace is a heat source for providing hot air for drying raw materials; the structure of the prior grinding disc mainly adopts an inner cavity flat disc with an inclined angle of a middle supporting body, and adopts high-chromium cast iron for one-time sand casting molding.
In production practice, the inventors found that the above method has major drawbacks: on one hand, due to the grinding disc structure, the grinding area is easy to generate fatigue damage and crack under the action of alternating load and impact; on the other hand, the high-chromium cast iron is easy to cause casting defects due to the dimensional factors such as the diameter, the wall thickness and the like of the grinding disc in the casting process, and the disc body is easier to crack after machining. Therefore, after the vertical roller mill is enlarged, how the grinding disc structure is optimized on the basis that the bearing of the grinding disc is not affected, so that the weight of the equipment is reduced. Meanwhile, on the basis of being beneficial to processing and manufacturing of the grinding disc, the grinding disc material is selected and the manufacturing process is improved, so that the processing is more convenient, the manufacturing period is shortened, and production delay caused by damage of the grinding disc is avoided as much as possible. This problem has been an urgent problem to be solved in industrial production.
Disclosure of Invention
The invention provides a grinding disc structure of a vertical roller mill and a manufacturing method thereof for solving the technical problems in the prior art.
The invention adopts the technical proposal for solving the technical problems in the prior art that:
a vertical roller mill millstone structure which is characterized in that: comprises an upper millstone body, a scraping plate positioning ring, a middle supporting body and a lower millstone body; the upper surface of the upper millstone body is provided with an upper millstone body central hole for sand removal, an annular groove for placing a millstone lining plate is formed in the bottom of the annular groove, close to the central hole side, a pressing block mounting hole for fixing the lining plate is formed in the side, and a stop ring group mounting hole for blocking materials is formed in the edge of the annular groove; the lower grinding disc body is provided with a lower disc body center hole for sand removal, a stud through hole for connecting a speed reducer, a cover plate mounting hole for plugging the bottom and an arch key mounting hole for connecting an arch key; the middle support body is of a cylindrical structure; the lower end face of the upper grinding disc body is welded with the upper end face of the middle support body into a whole; the lower end face of the middle support body and the upper end face of the lower grinding disc body are welded into a whole; the centers of the upper grinding disc body, the middle supporting body and the lower grinding disc body are positioned on the same axis; a scraper positioning ring is welded at the half height of the outer circumferential wall of the middle support body, and a scraper mounting hole for connecting a scraper is formed in the scraper positioning ring along the radial direction; an outer ear plate is welded at the joint of the lower end surface of the upper millstone body and the middle support body, and an outer ear lifting hole for millstone lifting is formed in the outer ear plate; an inner ear plate is welded at the joint of the inner wall of the middle support body and the upper grinding disc body, an inner ear lifting hole for overturning the grinding disc is formed in the inner ear plate, and the inner ear plate and the outer ear plate are arranged in a 360-degree staggered mode in the circumferential direction.
The invention can also adopt the following technical measures:
the external auditory plate is provided with 4, and 4 external auditory plates are uniformly welded at the joint of the outer sides of the upper millstone body and the middle support body.
The outer ear plates are provided with 4, and 4 inner ear plates are uniformly welded at the joint of the inner sides of the upper grinding disc body and the middle support body.
The invention also discloses a manufacturing method of the vertical roller mill disc structure, which comprises the following steps:
firstly, carrying out sand casting molding on the upper grinding disc body by adopting No. 35 steel once, and ensuring that the wall thickness of the middle annular groove is not less than 80mm; sequentially processing upper disc body center holes for sand removal on the cast upper disc bodies, annular grooves for placing disc lining plates, press block mounting holes for fixing the lining plates and stop ring group mounting holes for blocking materials;
step two, the lower grinding disc body is formed by adopting 35 # steel through one-time sand casting, and the wall thickness of the arch key mounting hole is ensured to be not less than 80mm; sequentially processing center holes of a lower disc body for sand removal on the lower disc body formed by casting, and connecting stud through holes of a speed reducer, cover plate mounting holes for plugging the bottom and arch key mounting holes for connecting arch keys;
step three, the middle support body adopts a Q235-B steel plate with the thickness of 80mm, is rolled and welded into a cylindrical shape, and is respectively welded with the upper millstone body and the lower millstone body into a whole;
fourthly, a scraper positioning ring adopts a Q235-A steel plate with the thickness of 60mm, is welded at one half of the height of the middle support body after being integrally manufactured, and is provided with a scraper mounting hole for connecting a scraper along the radial direction;
fifthly, the outer ear plate and the inner ear plate are respectively welded with the upper grinding disc body and the middle supporting body into a whole by adopting Q235-A steel plates with the thickness of 60 mm;
and step six, the whole millstone processed in the step five is placed into a heating furnace for heat treatment and high-temperature tempering, and the welding residual stress is eliminated.
The upper grinding disc body, the lower grinding disc body, the scraping plate positioning ring, the outer ear plate and the inner ear plate are welded by alkaline low-hydrogen welding rods in the welding process; preheating and slow cooling treatment are carried out in the welding process.
The invention has the advantages and positive effects that: the invention has reasonable structural design and simple and convenient processing and manufacturing, and can realize weight reduction under the condition of not reducing the bearing capacity of the grinding disc, thereby reducing the cost input of the vertical mill equipment; the whole manufacturing process is not limited by casting and machining capacity any more, so that the phenomena that the grinding disc is easy to generate fatigue damage and crack under the action of alternating load and impact are effectively avoided, the stable material layer formed on the grinding disc by materials is well ensured, and the long-term stable normal operation of the vertical mill is ensured. Under the trend of upsizing of the vertical mill, the difficulty of processing, manufacturing and nondestructive testing is effectively reduced, and great convenience is brought to transportation and field installation.
Drawings
Fig. 1 is a schematic structural view of the present invention.
In the figure: 1. an upper millstone body; 1-1, a central hole of an upper disc body; 1-2, an annular groove; 1-3, briquetting mounting holes; 1-4, mounting holes of a striker ring group; 2. a scraper positioning ring; 2-1, a scraper mounting hole; 3. an intermediate support; 4. a lower millstone body; 4-1, a central hole of the lower disc body; 4-2, a double-end stud through hole; 4-3, cover plate mounting holes; 4-4, arch key mounting holes; 5. an outer ear plate; 5-1, outer ear lifting holes; 6. an inner ear plate; 6-1, lifting holes of inner lugs.
Detailed Description
For a further understanding of the invention, its features and advantages, reference is now made to the following examples, which are illustrated in the accompanying drawings in which:
referring to fig. 1, a grinding disc structure of a vertical roller mill comprises an upper grinding disc body 1, a scraping plate positioning ring 2, a middle supporting body 3 and a lower grinding disc body 4; the upper surface of the upper millstone body 1 is provided with an upper millstone body central hole 1-1 for sand removal, an annular groove 1-2 for placing millstone lining plates, a pressing block mounting hole 1-3 for fixing the lining plates is arranged at the bottom of the annular groove close to the central hole side, and a stop ring group mounting hole 1-4 for blocking materials is arranged at the edge;
the lower grinding disc body 4 is provided with a lower disc body center hole 4-1 for sand removal, a stud through hole 4-2 for connecting a speed reducer, a cover plate mounting hole 4-3 for plugging the bottom and an arch key mounting hole 4-4 for connecting an arch key;
the middle supporting body 3 is of a cylindrical structure;
the lower end face of the upper grinding disc body 1 and the upper end face of the middle supporting body 3 are welded into a whole; the lower end face of the middle support body 3 and the upper end face of the lower grinding disc body 4 are welded into a whole; the centers of the upper grinding disc body 1, the middle supporting body 3 and the lower grinding disc body 4 are positioned on the same axis;
a scraper positioning ring 2 is welded at the half height of the outer circumferential wall of the middle support body 3, and a scraper mounting hole 2-1 for connecting a scraper is arranged on the scraper positioning ring along the radial direction;
an outer ear plate 5 is welded at the joint of the lower end surface of the upper millstone body 1 and the middle supporting body 3, and an outer ear lifting hole 5-1 for millstone lifting is formed in the outer ear plate; an inner ear plate 6 is welded at the joint of the inner wall of the middle support body and the upper grinding disc body, an inner ear lifting hole 6-1 for turning over the grinding disc is formed in the inner ear plate 6, and the inner ear plate and the outer ear plate are staggered at 360 degrees in the circumferential direction;
the number of the outer ear plates is 4, and the 4 outer ear plates are uniformly welded at the joint of the outer sides of the upper grinding disc body and the middle support body;
the number of the outer ear plates is 4, and the 4 inner ear plates are uniformly welded at the joint of the inner sides of the upper grinding disc body and the middle support body.
The invention also discloses a manufacturing method of the grinding disc structure of the vertical roller mill, which comprises the following steps:
firstly, carrying out sand casting molding on the upper grinding disc body by adopting No. 35 steel once, and ensuring that the wall thickness of the middle annular groove is not less than 80mm; an upper disc body central hole 1-1 for sand removal is processed on an upper disc body formed by casting, an annular groove 1-2 for placing a disc lining plate, a pressing block mounting hole 1-3 for fixing the lining plate and a stop ring group mounting hole 1-4 for blocking materials;
step two, the lower grinding disc body is formed by adopting 35 # steel through one-time sand casting, and the wall thickness of the arch key mounting hole is ensured to be not less than 80mm; sequentially processing a central hole 4-1 of a lower disc body for sand removal on the lower disc body formed by casting, and connecting a double-end stud through hole 4-2 of a speed reducer and a cover plate mounting hole 4-3 for plugging the bottom; an arch key mounting hole 4-4 for connecting an arch key;
step three, the middle support body adopts a Q235-B steel plate with the thickness of 80mm, is rolled and welded into a cylindrical shape, and is respectively welded with the upper millstone body and the lower millstone body into a whole;
fourthly, a scraper positioning ring adopts a Q235-A steel plate with the thickness of 60mm, is welded at the half height of the middle supporting body after being integrally manufactured, and is provided with a scraper mounting hole 2-1 for connecting a scraper along the radial direction;
fifthly, the outer ear plate and the inner ear plate are respectively welded with the upper grinding disc body and the middle supporting body into a whole by adopting Q235-A steel plates with the thickness of 60 mm;
and step six, the whole millstone processed in the step five is placed into a heating furnace for heat treatment and high-temperature tempering, and the welding residual stress is eliminated.
The upper grinding disc body, the lower grinding disc body, the scraping plate positioning ring, the outer ear plate and the inner ear plate are welded by alkaline low-hydrogen welding rods in the welding process; preheating and slow cooling treatment are carried out in the welding process.
The invention has reasonable structural design and simple and convenient processing and manufacturing, and can realize weight reduction under the condition of not reducing the bearing capacity of the grinding disc, thereby reducing the cost input of the vertical mill equipment; the whole manufacturing process is not limited by casting and machining capacity any more, so that the phenomena that the grinding disc is easy to generate fatigue damage and crack under the action of alternating load and impact are effectively avoided, the stable material layer formed on the grinding disc by materials is well ensured, and the long-term stable normal operation of the vertical mill is ensured. Under the trend of upsizing of the vertical mill, the difficulty of processing, manufacturing and nondestructive testing is effectively reduced, and great convenience is brought to transportation and field installation.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the invention in any way, but any simple modification, equivalent variation and modification of the above embodiments according to the technical principles of the present invention are within the scope of the technical solutions of the present invention.
Claims (4)
1. A manufacturing method of a grinding disc structure of a vertical roller mill is characterized by comprising the following steps: the vertical roller mill grinding disc structure comprises an upper grinding disc body, a scraping plate positioning ring, a middle supporting body and a lower grinding disc body; the upper surface of the upper millstone body is provided with an upper millstone body central hole for sand removal, an annular groove for placing a millstone lining plate is formed in the bottom of the annular groove, close to the central hole side, a pressing block mounting hole for fixing the lining plate is formed in the side, and a stop ring group mounting hole for blocking materials is formed in the edge of the annular groove; the lower grinding disc body is provided with a lower disc body center hole for sand removal, a stud through hole for connecting a speed reducer, a cover plate mounting hole for plugging the bottom and an arch key mounting hole for connecting an arch key; the middle support body is of a cylindrical structure; the lower end face of the upper grinding disc body is welded with the upper end face of the middle support body into a whole; the lower end face of the middle support body and the upper end face of the lower grinding disc body are welded into a whole; the centers of the upper grinding disc body, the middle supporting body and the lower grinding disc body are positioned on the same axis; a scraper positioning ring is welded at the half height of the outer circumferential wall of the middle support body, and a scraper mounting hole for connecting a scraper is formed in the scraper positioning ring along the radial direction; an outer ear plate is welded at the joint of the lower end surface of the upper millstone body and the middle support body, and an outer ear lifting hole for millstone lifting is formed in the outer ear plate; an inner ear plate is welded at the joint of the inner wall of the middle support body and the upper grinding disc body, an inner ear lifting hole for turning over the grinding disc is formed in the inner ear plate, and the inner ear plate and the outer ear plate are staggered at 360 degrees in the circumferential direction;
the manufacturing method of the vertical roller mill disc structure comprises the following steps:
firstly, carrying out sand casting molding on the upper grinding disc body by adopting No. 35 steel once, and ensuring that the wall thickness of the middle annular groove is not less than 80mm; sequentially processing upper disc body center holes for sand removal on the cast upper disc bodies, annular grooves for placing disc lining plates, press block mounting holes for fixing the lining plates and stop ring group mounting holes for blocking materials;
step two, the lower grinding disc body is formed by adopting 35 # steel through one-time sand casting, and the wall thickness of the arch key mounting hole is ensured to be not less than 80mm; sequentially processing center holes of lower disc bodies for sand removal on the lower disc bodies formed by casting, connecting stud through holes of a speed reducer, plugging cover plate mounting holes at the bottom and arch key mounting holes for connecting arch keys;
step three, the middle support body adopts a Q235-B steel plate with the thickness of 80mm, is rolled and welded into a cylindrical shape, and is respectively welded with the upper millstone body and the lower millstone body into a whole;
fourthly, a scraper positioning ring adopts a Q235-A steel plate with the thickness of 60mm, is welded at one half of the height of the middle support body after being integrally manufactured, and is provided with a scraper mounting hole for connecting a scraper along the radial direction;
fifthly, the outer ear plate and the inner ear plate are respectively welded with the upper grinding disc body and the middle supporting body into a whole by adopting Q235-A steel plates with the thickness of 60 mm;
and step six, the whole millstone processed in the step five is placed into a heating furnace for heat treatment and high-temperature tempering, and the welding residual stress is eliminated.
2. The method for manufacturing the grinding disc structure of the vertical roller mill according to claim 1, wherein: the external auditory plate is provided with 4, and 4 external auditory plates are uniformly welded at the joint of the outer sides of the upper millstone body and the middle support body.
3. The method for manufacturing the grinding disc structure of the vertical roller mill according to claim 1, wherein: the outer ear plates are provided with 4, and 4 inner ear plates are uniformly welded at the joint of the inner sides of the upper grinding disc body and the middle support body.
4. The method of manufacturing a grinding disc structure of a vertical roller mill according to claim 1, characterized in that; the upper grinding disc body, the lower grinding disc body, the scraping plate positioning ring, the outer ear plate and the inner ear plate are welded by alkaline low-hydrogen welding rods in the welding process; preheating and slow cooling treatment are carried out in the welding process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810948111.3A CN108837890B (en) | 2018-08-20 | 2018-08-20 | Vertical roller mill millstone structure and manufacturing method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810948111.3A CN108837890B (en) | 2018-08-20 | 2018-08-20 | Vertical roller mill millstone structure and manufacturing method |
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| Publication Number | Publication Date |
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| CN108837890A CN108837890A (en) | 2018-11-20 |
| CN108837890B true CN108837890B (en) | 2024-02-27 |
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| CN201810948111.3A Active CN108837890B (en) | 2018-08-20 | 2018-08-20 | Vertical roller mill millstone structure and manufacturing method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203342851U (en) * | 2013-05-24 | 2013-12-18 | 唐山冀东装备工程股份有限公司 | Millstone of vertical roller mill |
| CN203379932U (en) * | 2013-07-23 | 2014-01-08 | 中材（天津）粉体技术装备有限公司 | Split type millstone of vertical roller mill |
| CN105879975A (en) * | 2016-06-24 | 2016-08-24 | 中材（天津）粉体技术装备有限公司 | Vertical roller mill air guide ring device |
| CN207709189U (en) * | 2017-12-05 | 2018-08-10 | 新乡市长城机械有限公司 | A kind of arch key positioning device of vertical roll grinder |
| CN208771543U (en) * | 2018-08-20 | 2019-04-23 | 天津机电职业技术学院 | A kind of vertical roller grinder mill structure |
-
2018
- 2018-08-20 CN CN201810948111.3A patent/CN108837890B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203342851U (en) * | 2013-05-24 | 2013-12-18 | 唐山冀东装备工程股份有限公司 | Millstone of vertical roller mill |
| CN203379932U (en) * | 2013-07-23 | 2014-01-08 | 中材（天津）粉体技术装备有限公司 | Split type millstone of vertical roller mill |
| CN105879975A (en) * | 2016-06-24 | 2016-08-24 | 中材（天津）粉体技术装备有限公司 | Vertical roller mill air guide ring device |
| CN207709189U (en) * | 2017-12-05 | 2018-08-10 | 新乡市长城机械有限公司 | A kind of arch key positioning device of vertical roll grinder |
| CN208771543U (en) * | 2018-08-20 | 2019-04-23 | 天津机电职业技术学院 | A kind of vertical roller grinder mill structure |
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| CN108837890A (en) | 2018-11-20 |
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