CN110076323B - Preparation method of medium-speed coal mill grinding roller sleeve - Google Patents
Preparation method of medium-speed coal mill grinding roller sleeve Download PDFInfo
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- CN110076323B CN110076323B CN201910370824.0A CN201910370824A CN110076323B CN 110076323 B CN110076323 B CN 110076323B CN 201910370824 A CN201910370824 A CN 201910370824A CN 110076323 B CN110076323 B CN 110076323B
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- zirconia ceramic
- roller sleeve
- aluminum tank
- base body
- pouring
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C4/00—Crushing or disintegrating by roller mills
- B02C4/28—Details
- B02C4/30—Shape or construction of rollers
- B02C4/305—Wear resistant rollers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D19/00—Casting in, on, or around objects which form part of the product
- B22D19/0081—Casting in, on, or around objects which form part of the product pretreatment of the insert, e.g. for enhancing the bonding between insert and surrounding cast metal
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D19/00—Casting in, on, or around objects which form part of the product
- B22D19/08—Casting in, on, or around objects which form part of the product for building-up linings or coverings, e.g. of anti-frictional metal
- B22D19/085—Casting in, on, or around objects which form part of the product for building-up linings or coverings, e.g. of anti-frictional metal of anti-frictional metal
Abstract
The invention relates to the technical field of coal mills, in particular to a preparation method of a grinding roller sleeve of a medium-speed coal mill. According to the invention, zirconia ceramic micro powder is granulated by using viscose to form zirconia ceramic particles, an aluminum tank is used as a container for drying and forming, the obtained zirconia ceramic-aluminum tank forming body is fixed on the outer surface of a roller sleeve base body, an anti-overflow cover is arranged on the edge of the roller sleeve base body, then pouring liquid is adopted for pouring, in the pouring process, the aluminum tank in the zirconia ceramic-aluminum tank forming body is melted, the zirconia ceramic particles are cracked, the released zirconia ceramic micro powder is fully mixed with the pouring liquid, and finally the zirconia ceramic micro powder is uniformly distributed in a wear-resistant composite layer formed on the outer surface of the roller sleeve base body, so that the wear resistance of the roller sleeve is improved; meanwhile, glue which has an adhesive effect in the zirconia ceramic particles is carbonized and remained in the wear-resistant composite layer, so that the control force on the diffusion of the zirconia ceramic micro powder is improved.
Description
Technical Field
The invention relates to the technical field of coal mills, in particular to a preparation method of a grinding roller sleeve of a medium-speed coal mill.
Background
The coal mill is an important auxiliary device of the coal powder furnace, and can crush and mill coal blocks into coal powder. The medium-speed coal mill is a coal mill with the working rotating speed of 50-300 r/min, and belongs to special equipment for preparing and processing boiler pulverized coal. Common medium speed coal mills include pan mills, bowl mills, E-mills and roller mills, wherein the roller sleeves of the rollers of conventional roller mills are susceptible to wear and short in service life, which can interrupt production when the roller sleeves of the rollers are replaced, affecting production efficiency and production cost.
Disclosure of Invention
The invention aims to provide a method for preparing a grinding roller sleeve of a medium-speed coal mill.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a method for preparing a grinding roller sleeve of a medium-speed coal mill, which comprises the following steps:
mixing the zirconia ceramic micro powder with the viscose, and granulating to obtain zirconia ceramic particles;
placing the zirconia ceramic particles in an aluminum tank for drying and forming to obtain a zirconia ceramic-aluminum tank forming body;
and fixing a plurality of zirconia ceramic-aluminum tank forming bodies on the outer surface of the roller sleeve base body, arranging an anti-overflow cover at the edge of the roller sleeve base body, then pouring by adopting pouring liquid, and forming a wear-resistant composite layer on the outer surface of the roller sleeve base body to obtain the grinding roller sleeve of the medium-speed coal mill.
Preferably, the granularity of the zirconia ceramic micro powder is 0.5-1.5 mm.
Preferably, the particle size of the zirconia ceramic particles is 5-8 mm.
Preferably, the aluminum tank is cylindrical, the height of the aluminum tank is 30-40 mm, the inner diameter of the aluminum tank is 25-30 mm, and the thickness of the aluminum tank is 1.5-2.5 mm.
Preferably, the drying and forming temperature is 80-120 ℃, and the time is 3-5 h.
Preferably, the density of the zirconia ceramic-aluminum can forming body on the outer surface of the roller sleeve base body is 800-1100/m2。
Preferably, the fixing mode is mechanical fixing of the heat-resistant steel bars.
Preferably, the material of the anti-overflow cover is heat-resistant steel.
Preferably, the casting temperature is 1350-1450 ℃, and the flow rate of the casting liquid is 40-60 mm/min.
Preferably, the thickness of the wear-resistant composite layer is 22-28 mm.
The invention provides a method for preparing a grinding roller sleeve of a medium-speed coal mill, which comprises the following steps: mixing the zirconia ceramic micro powder with the viscose, and granulating to obtain zirconia ceramic particles; placing the zirconia ceramic particles in an aluminum tank for drying and forming to obtain a zirconia ceramic-aluminum tank forming body; and fixing a plurality of zirconia ceramic-aluminum tank forming bodies on the outer surface of the roller sleeve base body, arranging an anti-overflow cover at the edge of the roller sleeve base body, then pouring by adopting pouring liquid, and forming a wear-resistant composite layer on the outer surface of the roller sleeve base body to obtain the grinding roller sleeve of the medium-speed coal mill. The method comprises the steps of granulating zirconia ceramic micro powder by using viscose, drying and forming by using an aluminum tank as a container, fixing an obtained zirconia ceramic-aluminum tank forming body on the outer surface of a roller sleeve base body, arranging an anti-overflow cover at the edge of the roller sleeve base body, then pouring by using pouring liquid, wherein in the pouring process, the aluminum tank in the zirconia ceramic-aluminum tank forming body is melted, zirconia ceramic particles are cracked, the released zirconia ceramic micro powder is fully mixed with the pouring liquid, and finally, the zirconia ceramic micro powder is uniformly distributed in a wear-resistant composite layer formed on the outer surface of the roller sleeve base body, so that the wear resistance of the roller sleeve is improved; meanwhile, glue which has an adhesive effect in the zirconia ceramic particles is carbonized and remained in the wear-resistant composite layer, so that the control force on the diffusion of the zirconia ceramic micro powder is improved. The results of the embodiment show that the wear resistance of the grinding roller sleeve of the medium-speed coal mill provided by the invention is greatly improved, and the actual operation time can exceed 30000 h.
Detailed Description
The invention provides a method for preparing a grinding roller sleeve of a medium-speed coal mill, which comprises the following steps:
mixing the zirconia ceramic micro powder with the viscose, and granulating to obtain zirconia ceramic particles;
placing the zirconia ceramic particles in an aluminum tank for drying and forming to obtain a zirconia ceramic-aluminum tank forming body;
and fixing a plurality of zirconia ceramic-aluminum tank forming bodies on the outer surface of the roller sleeve base body, arranging an anti-overflow cover at the edge of the roller sleeve base body, then pouring by adopting pouring liquid, and forming a wear-resistant composite layer on the outer surface of the roller sleeve base body to obtain the grinding roller sleeve of the medium-speed coal mill.
In the present invention, unless otherwise specified, all the starting materials required for the preparation are commercially available products well known to those skilled in the art.
The zirconia ceramic particles are obtained by mixing zirconia ceramic micro powder and viscose and then granulating. In the invention, the granularity of the zirconia ceramic micro powder is preferably 0.5-1.5 mm, and more preferably 0.8-1.2 mm; the granularity of the zirconia ceramic particles is preferably 5-8 mm, and more preferably 6-7 mm. The specific type or dosage of the viscose is not particularly limited, and the high-temperature-resistant glue well known to those skilled in the art is used as the viscose, so that the zirconia ceramic micro powder can be bonded together to form zirconia ceramic particles with required particle size. The specific operation mode of the granulation is not specially limited, and the granulation can be extrusion, rubbing and screening granulation and rolling granulation, or extrusion, rubbing and screening-rolling composite granulation.
After the zirconia ceramic particles are obtained, the zirconia ceramic particles are placed in an aluminum tank for drying and forming, and a zirconia ceramic-aluminum tank forming body is obtained. In the present invention, the aluminum can is preferably cylindrical; the height of the aluminum tank is preferably 30-40 mm, and more preferably 35-40 mm; the inner diameter is preferably 25-30 mm, and more preferably 28-30 mm; the thickness is preferably 1.5 to 2.5mm, more preferably 1.5 to 2.0 mm. In the invention, in order to facilitate the subsequent fixing of a plurality of zirconia ceramic-aluminum can forming bodies on the outer surface of the roller sleeve matrix, a fixing hole is preferably arranged at the center of a circle at the bottom of the aluminum can; the diameter of the fixing hole is preferably 4-5 mm (the specific fixing mode is described in detail later). In the invention, the drying and forming temperature is preferably 80-120 ℃, and more preferably 90-110 ℃; the time is preferably 3 to 5 hours, and more preferably 3 to 4 hours.
In the invention, in the drying and forming process, the solvent of the viscose in the zirconia ceramic particles volatilizes to form spheres with the granularity of 3-5 mm, and the fusing of zirconia ceramic micro powder and a roller sleeve substrate is promoted in the subsequent pouring process; meanwhile, the roller sleeve is beneficial to uniform diffusion of the zirconia ceramic micro powder, segregation and aggregation are avoided, and finally a wear-resistant composite layer with the zirconia ceramic micro powder uniformly distributed is formed on the outer surface of the roller sleeve substrate.
After the zirconia ceramic-aluminum can forming bodies are obtained, a plurality of the zirconia ceramic-aluminum can forming bodies are fixed on the outer surface of a roller sleeve base body, an anti-overflow cover is arranged on the edge of the roller sleeve base body, then pouring is carried out by adopting pouring liquid, a wear-resistant composite layer is formed on the outer surface of the roller sleeve base body, and the roller sleeve of the grinding roller of the medium-speed coal mill is obtained. In the invention, the material of the roller sleeve base body preferably comprises high-chromium cast iron or medium-chromium cast iron; the specific grade of the high-chromium cast iron and the medium-chromium cast iron is not particularly limited, and the high-chromium cast iron and the medium-chromium cast iron which are well known to those skilled in the art can be adopted. The preparation method of the roller sleeve matrix is not particularly limited, and the method well known by the technical personnel in the field can be adopted; in the invention, the preparation method of the roller sleeve matrix is preferably sand casting; the specific operation steps and parameters of the sand casting are not particularly limited, and the technical scheme of sand casting known to those skilled in the art can be adopted.
After the roller sleeve matrix is obtained, a plurality of zirconia ceramic-aluminum can forming bodies are fixed on the outer surface of the roller sleeve matrix, and an anti-overflow cover is arranged on the edge of the roller sleeve matrix. In the present invention, the zirconia ceramic-aluminum can compact preferably has a density of 800 to 1100/m on the outer surface of the roll shell base2More preferably 900 to 1000 pieces/m2(ii) a The distribution mode of the zirconia ceramic-aluminum can forming body on the outer surface of the roller sleeve base body is not specially limited, and the zirconia ceramic-aluminum can forming body can be uniformly distributed. In the invention, the fixing mode is preferably that the heat-resistant steel bar is mechanically fixed, namely, one end of the heat-resistant steel bar penetrates into a fixing hole at the bottom of the aluminum can, and the other end of the heat-resistant steel bar is mechanically embedded on the outer surface of the roller sleeve base body; in the invention, the diameter of the heat-resistant steel bar is preferably 4-5 mm; the specific grade of the heat-resistant reinforcing steel bar is not particularly limited, and the heat-resistant reinforcing steel bar known by the person skilled in the art can be adopted. In the invention, when the subsequent pouring is carried out, the heat-resistant steel bar and the pouring liquid are fused together, and a wear-resistant composite layer is formed on the outer surface of the roller sleeve substrate; the main components of the heat-resistant reinforcing steel bar are iron and carbon, so that the performance of the wear-resistant composite layer is not affected. The mechanical engagement method of the present invention is not particularly limited, and any method known to those skilled in the art may be used.
In the invention, the material of the anti-overflow cover is preferably heat-resistant steel; the specific grade of the heat-resistant steel is not specially limited, and the heat-resistant steel well known by the technical personnel in the field can be adopted; the aperture of the anti-overflow cover is preferably less than or equal to 1.5 mm. In the invention, the anti-overflow cover is arranged at the edge of the roller sleeve base body; the specific arrangement of the present invention is not particularly limited, and may be any arrangement known to those skilled in the art. According to the invention, the anti-overflow cover is arranged, so that zirconia ceramic micro powder is prevented from flowing to the side surface of the roller sleeve substrate along with the pouring liquid after zirconia ceramic particles burst in the subsequent pouring process.
After a zirconia ceramic-aluminum pot forming body is fixed on the outer surface of the roller sleeve base body and an anti-overflow cover is arranged on the edge of the zirconia ceramic-aluminum pot forming body, the roller sleeve is poured by adopting pouring liquid, and a wear-resistant composite layer is formed on the outer surface of the roller sleeve base body, so that the roller sleeve of the grinding roller of the medium-speed coal mill is obtained. In the present invention, the casting liquid preferably includes molten iron or steel.
In the invention, a multi-pouring channel and a U-shaped pouring channel are preferably adopted during pouring; the specific arrangement of the multi-pouring channel and the U-shaped pouring channel is not particularly limited in the present invention, and the method known to those skilled in the art can be adopted. In the invention, the casting temperature is preferably 1350-1450 ℃, and more preferably 1380-1420 ℃; the flow rate of the casting liquid is preferably 40-60 mm/min, and more preferably 45-55 mm/min; the thickness of the wear-resistant composite layer is preferably 22-28 mm, and more preferably 25 mm.
In the invention, in the casting process, an aluminum tank (with the melting point of about 660 ℃) in a zirconia ceramic-aluminum tank forming body is firstly melted, zirconia ceramic particles can burst, released zirconia ceramic micro powder is fully mixed with casting liquid, and a wear-resistant composite layer is formed on the outer surface of the roller sleeve base body, wherein the flow rate of the casting liquid is limited to 40-60 mm/min by adopting a multi-runner and U-shaped runner casting mode and controlling the casting temperature, so that a uniform wear-resistant composite layer is favorably formed, the problem of uneven distribution of the zirconia ceramic micro powder in the wear-resistant composite layer due to scouring of the casting liquid on the zirconia ceramic micro powder is avoided, and the wear resistance of the roller sleeve of the medium-speed coal mill is improved.
The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Mixing zirconia ceramic micro powder with the granularity of 0.5-1.0 mm with high-temperature resistant glue, extruding, rubbing, screening and granulating to obtain zirconia ceramic particles with the granularity of 5-6 mm;
placing the zirconia ceramic particles in a cylindrical aluminum tank (the height is 40mm, the inner diameter is 30mm, the thickness is 1.5mm, and a fixing hole with the diameter of 5mm is arranged at the center of the bottom circle), and drying and molding for 4h at the temperature of 110 ℃ to obtain a zirconia ceramic-aluminum tank molded body;
a plurality of the zirconia ceramic-aluminum can forming bodies are mechanically fixed on the outer surface of a roller sleeve base body by using heat-resistant steel bars with the diameter of 5mm (one end of each heat-resistant steel bar penetrates through a fixing hole at the bottom of an aluminum can, and the other end of each heat-resistant steel bar is mechanically embedded on the outer surface of the roller sleeve base body), and the heat-resistant steel bars are uniformly distributed and have the density of 1100/m2And arranging a heat-resistant steel anti-overflow cover (the aperture is 1.5mm) at the edge of the roller sleeve base body, and then pouring by using molten iron as pouring liquid, wherein the pouring is carried out by adopting a multi-pouring gate and U-shaped pouring gate design, the pouring temperature is 1380 ℃, the flow rate of the pouring liquid is 45mm/min, and after the pouring is finished, a wear-resistant composite layer with the thickness of 26mm is formed on the outer surface of the roller sleeve base body, so that the grinding roller sleeve of the medium-speed coal mill is obtained.
Example 2
Mixing zirconia ceramic micro powder with the granularity of 1.0-1.5 mm with high-temperature glue, and then carrying out rolling granulation to obtain zirconia ceramic particles with the granularity of 5-6 mm;
placing the zirconia ceramic particles in a cylindrical aluminum tank (the height is 40mm, the inner diameter is 30mm, the thickness is 1.5mm, and a fixing hole with the diameter of 5mm is arranged at the center of the bottom circle), and drying and molding for 3h at the temperature of 90 ℃ to obtain a zirconia ceramic-aluminum tank molded body;
a plurality of the zirconia ceramic-aluminum can forming bodies are mechanically fixed on the outer surface of a roller sleeve base body by using heat-resistant reinforcing steel bars with the diameter of 5mm (one end of each heat-resistant reinforcing steel bar penetrates through a fixing hole at the bottom of an aluminum can, and the other end of each heat-resistant reinforcing steel bar is mechanically embedded on the outer surface of the roller sleeve base body), are uniformly distributed, and have the density of 800 pieces/m2Arranging a heat-resistant steel anti-overflow cover (with the aperture of 1.5mm) at the edge of the roller sleeve base body, and then pouring by using molten iron as pouring liquid, wherein the pouring adopts a multi-pouring gate and U-shaped pouring gate design, the pouring temperature is 1420 ℃,and (3) the flow rate of the casting liquid is 55mm/min, and after casting is finished, a wear-resistant composite layer with the thickness of 24mm is formed on the outer surface of the roller sleeve substrate, so that the roller sleeve of the grinding roller of the medium-speed coal mill is obtained.
Example 3
Mixing zirconia ceramic micro powder with the granularity of 0.8-1.2 mm with high-temperature glue, and then extruding, screening and rolling for composite granulation to obtain zirconia ceramic particles with the granularity of 5-6 mm;
placing the zirconia ceramic particles in a cylindrical aluminum tank (the height is 40mm, the inner diameter is 30mm, the thickness is 1.5mm, and a fixing hole with the diameter of 5mm is arranged at the center of the bottom circle), and drying and molding for 4h at the temperature of 100 ℃ to obtain a zirconia ceramic-aluminum tank molded body;
fixing a plurality of the zirconia ceramic-aluminum can forming bodies on the outer surface of the roller sleeve base body by using heat-resistant reinforcing steel bars with the diameter of 5mm (one end of each heat-resistant reinforcing steel bar penetrates through a fixing hole at the bottom of the aluminum can, and the other end of each heat-resistant reinforcing steel bar is mechanically embedded on the outer surface of the roller sleeve base body), uniformly distributing the heat-resistant reinforcing steel bars, and ensuring that the density of the heat-resistant reinforcing steel2And arranging a heat-resistant steel anti-overflow cover (the aperture is 1.5mm) at the edge of the roller sleeve base body, and then pouring by using molten iron as pouring liquid, wherein the pouring is carried out by adopting a multi-pouring gate and U-shaped pouring gate design, the pouring temperature is 1400 ℃, the flow rate of the pouring liquid is 50mm/min, and after the pouring is finished, a wear-resistant composite layer with the thickness of 25mm is formed on the outer surface of the roller sleeve base body, so that the grinding roller sleeve of the medium speed coal mill is obtained.
Comparative example 1
The grinding roller sleeve of the medium-speed coal mill is prepared according to the method disclosed in the patent CN 207254424U.
The performance tests of the medium speed coal mill grinding roller sleeves prepared in examples 1-3 and comparative example 1 and the conventional roller sleeve (i.e., the roller sleeve substrate, which does not contain the wear-resistant layer) are performed, and the results are specifically shown in table 1.
TABLE 1 results of performance test of grinding roller sleeve of medium speed coal mill prepared in examples 1-3 and comparative example 1
As can be seen from Table 1, compared with the traditional roller sleeve and the roller sleeve of the grinding roller of the medium-speed coal mill disclosed in patent CN207254424U, the wear resistance of the roller sleeve of the grinding roller of the medium-speed coal mill provided by the invention is greatly improved, and the actual operation time exceeds 30000 h.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (8)
1. A preparation method of a grinding roller sleeve of a medium-speed coal mill comprises the following steps:
mixing the zirconia ceramic micro powder with the viscose, and granulating to obtain zirconia ceramic particles;
placing the zirconia ceramic particles in an aluminum tank for drying and forming to obtain a zirconia ceramic-aluminum tank forming body;
fixing a plurality of zirconia ceramic-aluminum tank forming bodies on the outer surface of a roller sleeve base body, arranging an anti-overflow cover on the edge of the roller sleeve base body, then pouring by adopting pouring liquid, and forming a wear-resistant composite layer on the outer surface of the roller sleeve base body to obtain a grinding roller sleeve of a medium-speed coal mill;
the aluminum tank is cylindrical, the height of the aluminum tank is 30-40 mm, the inner diameter of the aluminum tank is 25-30 mm, and the thickness of the aluminum tank is 1.5-2.5 mm;
the density of the zirconia ceramic-aluminum can forming body on the outer surface of the roller sleeve matrix is 800-1100/m2。
2. The method according to claim 1, wherein the zirconia ceramic fine powder has a particle size of 0.5 to 1.5 mm.
3. The method according to claim 1 or 2, wherein the zirconia ceramic particles have a particle size of 5 to 8 mm.
4. The preparation method according to claim 1, wherein the temperature for drying and forming is 80-120 ℃ and the time is 3-5 h.
5. The method for preparing the heat-resistant steel bar, according to claim 1, wherein the fixing mode is mechanical fixing of the heat-resistant steel bar.
6. The preparation method according to claim 1, wherein the material of the anti-overflow cover is heat-resistant steel.
7. The method according to claim 1, wherein the casting temperature is 1350 to 1450 ℃ and the flow rate of the casting liquid is 40 to 60 mm/min.
8. The preparation method according to claim 1, wherein the thickness of the wear-resistant composite layer is 22-28 mm.
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| JP2007224355A (en) * | 2006-02-23 | 2007-09-06 | Taiheiyo Cement Corp | Roller and its manufacturing method |
| CN102921925B (en) * | 2012-10-29 | 2015-06-10 | 江苏大学 | Method for reducing pouring temperature of iron-based surface composite material |
| CN103203428B (en) * | 2013-04-27 | 2015-08-12 | 北京电力设备总厂有限公司 | Lost foam casting composite wear-resistant part and casting method thereof |
| CN105126959B (en) * | 2015-08-28 | 2018-05-29 | 南通高欣耐磨科技股份有限公司 | A kind of manufacturing method of detachable ceramal composite grinding roll |
| CN105382243B (en) * | 2015-11-06 | 2017-07-07 | 洛阳鹏飞耐磨材料股份有限公司 | The preparation method of wear-resisting mill |
| CN106111946A (en) * | 2016-06-28 | 2016-11-16 | 王俊 | A kind of composite ceramics abrasion-resistant metal blank preparation method and goods thereof |
| CN207254424U (en) * | 2017-09-05 | 2018-04-20 | 国家电投集团重庆合川发电有限公司 | A kind of medium-speed coal mill roller roller set |
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