CN111514988A - Grinding roller of Raymond mill and manufacturing method thereof - Google Patents
Grinding roller of Raymond mill and manufacturing method thereof Download PDFInfo
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- CN111514988A CN111514988A CN202010352574.0A CN202010352574A CN111514988A CN 111514988 A CN111514988 A CN 111514988A CN 202010352574 A CN202010352574 A CN 202010352574A CN 111514988 A CN111514988 A CN 111514988A
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- grinding roller
- end cover
- wear
- boss
- grinding
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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
- B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
- B02C15/08—Mills with balls or rollers centrifugally forced against the inner surface of a ring, the balls or rollers of which are driven by a centrally arranged member
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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
- B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
- B02C15/004—Shape or construction of rollers or balls
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
- B22F7/06—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools
- B22F7/08—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools with one or more parts not made from powder
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- 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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y10/00—Processes of additive manufacturing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y80/00—Products made by additive manufacturing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Food Science & Technology (AREA)
- Composite Materials (AREA)
- Crushing And Grinding (AREA)
Abstract
The invention discloses a grinding roller of a Raymond grinding machine and a manufacturing method thereof. The surface of the grinding roller body is provided with the wear-resistant alloy layer, the wear-resistant alloy layer is printed on the surface of the grinding roller body and the surface of the wear-resistant wires through 3D, the hardness and the wear resistance of the outer surface layer of the grinding roller can be effectively improved, the service life of the grinding roller is further prolonged, meanwhile, when the wear-resistant alloy layer is worn, the grinding roller can be repaired and put into use again through the 3D printing of the wear-resistant alloy layer, and the maintenance cost in the maintenance process is further reduced; secondly, through dividing into grinding roller, first end cover and second end cover with the grinding roller body, make the inside of grinding roller have hollow portion, for integrated into one piece's among the prior art grinding roller, the effectual self weight that reduces the grinding roller reduces the intensity of labour of grinding roller when installation, dismantlement.
Description
Technical Field
The invention relates to the technical field of wear-resistant parts of a grinding equipment, in particular to a grinding roller of a Raymond mill and a manufacturing method thereof.
Background
At present, a Raymond mill is a typical powder making device, a grinding roller assembly of the Raymond mill is suspended on a grinding roller hanger through a cross arm shaft, a grinding roller is tightly rolled on a grinding ring under the action of centrifugal force, and the grinding roller rotates around a self shaft while rolling in an inner circle of the grinding ring. The grinding roller continuously extrudes and impacts material particles between the grinding roller and the grinding ring in the rolling process, so that the material is refined. The material of the outer surface layer of the grinding roller requires high hardness and wear resistance so as to prolong the grinding life. The grinding roller inner layer metal is connected on the cross arm shaft through a bearing, and high toughness, strength and impact resistance are required. When the toughness and the strength of the grinding roller are insufficient, the phenomenon of fracture is easy to occur, the whole equipment is damaged, and huge loss is caused.
However, the existing grinding roller is made of high manganese or high chromium, so that the service life is short, the use effect is low, the manufacturing cost is high and the repair is difficult due to the fact that the self weight is large and is generally about 100 kilograms, and the loading and unloading are difficult and the labor intensity is high during the loading and unloading.
Therefore, how to provide a grinding roller of a Raymond mill, which has high abrasion resistance, reduces the maintenance cost in the maintenance process, reduces the cost, improves the efficiency and prolongs the service life of the product, is a problem to be solved by technical personnel in the field.
Disclosure of Invention
In view of the above, the invention provides the grinding roller of the Raymond mill, which has high abrasion resistance, reduces the maintenance cost in the maintenance process, achieves the purposes of cost reduction and efficiency improvement and further prolongs the service life of the product.
In order to achieve the purpose, the invention adopts the following technical scheme:
on one hand, the invention provides a grinding roller of a Raymond grinding machine, which comprises a grinding roller body, wherein a wear-resistant alloy layer is arranged on the surface of the grinding roller body, and a wear-resistant wire is wound on one side, close to the grinding roller body, of the wear-resistant alloy layer.
Furthermore, the wear-resistant wire is spirally wound on the surface of the grinding roller body, and the thread pitch is 2-7 mm.
Further, the grinding roller body comprises a grinding roller barrel, a first end cover and a second end cover, and the first end cover and the second end cover are fixedly connected with two ends of the grinding roller barrel respectively.
Furthermore, a first conical shaft hole matched with the conical shaft is formed in the center of the first end cover, and a second conical shaft hole matched with the conical shaft is formed in the center of the second end cover.
Furthermore, a first boss for installing the first end cover and a second boss for installing the second end cover are respectively arranged at two ends of the grinding roller.
Furthermore, a plurality of through holes arranged in an array manner are arranged on the side walls of the grinding roller barrel corresponding to the first bosses and the second bosses.
Furthermore, a plurality of blind holes are formed in the side walls of the first end cover and the second end cover, and the blind holes correspond to the through holes in a one-to-one mode.
Further, the thickness of the first end cover is equal to the height of the first boss side wall, and the thickness of the second end cover is equal to the height of the second boss side wall.
On the other hand, the invention also provides a manufacturing method of the grinding roller of the Raymond mill, which comprises the following steps:
manufacturing a grinding roller, namely respectively processing a first boss and a second boss at two ends of a cylindrical steel pipe through machining;
manufacturing a first end cover and a second end cover, wherein the outer diameters of the first end cover and the second end cover are matched with the calibers of a first boss and a second boss of the grinding roller, and a first conical shaft hole and a second conical shaft hole are processed in the centers of the first end cover and the second end cover through a drilling machine, so that after the first end cover and the second end cover are arranged on the first boss and the second boss, the inner hole surface of the first conical shaft hole and the inner hole surface of the second conical shaft hole are in the same conical surface;
step three: respectively welding a first end cover and a second end cover to a first boss and a second boss at two ends of a grinding roller barrel to form a grinding roller body;
winding wear-resistant wires on the outer surface of the grinding roller body, wherein the wear-resistant wires are spiral;
and fifthly, printing the wear-resistant alloy on the surfaces of the grinding roller body and the wear-resistant wires through 3D to form a wear-resistant alloy layer.
According to the technical scheme, compared with the prior art, the invention discloses the grinding roller of the Raymond mill, which has the following beneficial effects:
the wear-resistant alloy layer is arranged on the surface of the grinding roller body, and the wear-resistant alloy layer is printed on the surface of the grinding roller body and the surface of the wear-resistant wires through 3D, so that the hardness and the wear resistance of the outer surface layer of the grinding roller can be effectively improved, the service life of the grinding roller is further prolonged, meanwhile, when the wear-resistant alloy layer is worn, the grinding roller can be repaired and put into use again through the 3D printing of the wear-resistant alloy layer, and the maintenance cost in the maintenance process is further reduced; the wear-resistant wires with a certain pitch are wound on one side of the wear-resistant alloy layer close to the grinding roller body, so that the wear resistance of the wear-resistant alloy layer of the grinding roller is further improved; secondly, through dividing into grinding roller, first end cover and second end cover with the grinding roller body, make the inside of grinding roller have hollow portion, for integrated into one piece's among the prior art grinding roller, the effectual self weight that reduces the grinding roller reduces the intensity of labour of grinding roller when installation, dismantlement.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic view of an exploded structure of a grinding roller of a Raymond mill roller according to the present invention;
FIG. 2 is a schematic view of an exploded view of a grinding roll body according to the present invention;
FIG. 3 is a schematic cross-sectional view of a grinding roll cartridge according to the present invention;
FIG. 4 is a schematic cross-sectional view of a grinding roll cartridge for providing a grinding roll body according to the present invention;
FIG. 5 is a schematic cross-sectional view of a first end cap according to the present invention;
fig. 6 is a schematic cross-sectional view of a second end cap according to the present invention.
Wherein: 1 is a grinding roller body; 11 is a grinding roller; 111 is a first boss; 112 is a second boss; 113 is a through hole; 12 is a first end cover; 13 is a second end cap; 2 is a wear-resistant alloy layer; 3 is wear-resistant wire; 4 is a first conical shaft hole; 5 is a second conical shaft hole; and 6, blind holes.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
On one hand, referring to the attached drawings 1-6, the embodiment of the invention discloses a grinding roller of a Raymond grinding machine, which comprises a grinding roller body 1, wherein a wear-resistant alloy layer 2 is arranged on the surface of the grinding roller body 1, and wear-resistant wires 3 are wound on one side, close to the grinding roller body 1, of the wear-resistant alloy layer 2. In the embodiment, the grinding roller body 1 is made of 45# steel, the wear-resistant wires 3 are firstly wound on the grinding roller body 1, the wear-resistant wires 3 are high-hardness wear-resistant wires with the HRC of 65-68, in the embodiment, HD65 wear-resistant welding wires are specifically used, the wear-resistant wires 3 are spirally wound on the surface of the grinding roller body 1, the thread pitch is 2-7 mm, preferably 5mm, then the wear-resistant alloy layer 2 is printed on the surfaces of the grinding roller body 1 and the wear-resistant wires 3 through 3D, the HRC of the wear-resistant alloy layer 2 is 65-68, and in the embodiment, the thickness of the wear-resistant alloy layer 2 is specifically 6 mm.
Specifically, the grinding roller body comprises a grinding roller barrel 11, a first end cover 12 and a second end cover 13, wherein the first end cover 11 and the second end cover 12 are fixedly connected with two ends of the grinding roller barrel 11 respectively. In this embodiment, the first end cap 11 and the second end cap 12 are fixedly connected to both ends of the grinding roller barrel 11 by welding.
Specifically, the center of the first end cap 12 is provided with a first conical shaft hole 4 matched with the conical shaft, and the center of the second end cap 13 is provided with a second conical shaft hole 5 matched with the conical shaft.
Specifically, the grinding roller 11 is provided at both ends thereof with a first boss 111 for mounting the first end cap 12 and a second boss 112 for mounting the second end cap 13, respectively.
After the first end cover 12 and the second end cover 13 are installed on the first boss 111 and the second boss 112 at the two ends of the grinding roller 11, the inner hole surface of the first conical shaft hole 4 and the inner hole surface of the second conical shaft hole 5 are in the same conical surface for installing the conical shaft.
Specifically, the side walls of the grinding roller barrel 11 corresponding to the first bosses 111 and the second bosses 112 are provided with a plurality of through holes 113 arranged in an array.
Specifically, all be equipped with a plurality of blind holes 6 on the lateral wall of first end cap 12 and second end cap 13, a plurality of blind holes 6 and a plurality of through-hole 113 one-to-one, can utilize the jackscrew to pass through-hole 113 and bury the jackscrew head in blind hole 6, further with first end cap 12 and second end cap 13 and grinding roller 11 fixed, also can insert 3 heads of wear-resisting silk in through-hole 113 and a blind hole 6 one-hole that form, as the starting point of wear-resisting silk 3, be convenient for wear-resisting silk 3 twines on the surface of grinding roller body 1.
Specifically, the thickness of the first end cap 12 is equal to the height of the sidewall of the first boss 111, and the thickness of the second end cap 13 is equal to the height of the sidewall of the second boss 112.
On the other hand, the invention also provides a manufacturing method of the grinding roller of the Raymond mill, which comprises the following steps:
manufacturing a grinding roller, namely respectively processing a first boss and a second boss at two ends of a cylindrical steel pipe through machining;
manufacturing a first end cover and a second end cover, wherein the outer diameters of the first end cover and the second end cover are matched with the calibers of a first boss and a second boss of the grinding roller, a first conical shaft hole and a second conical shaft hole are processed in the centers of the first end cover and the second end cover through a drilling machine, so that after the first end cover and the second end cover are installed on the first boss and the second boss, the inner hole surface of the first conical shaft hole and the inner hole surface of the second conical shaft hole are positioned on the same conical surface;
step three: respectively welding a first end cover and a second end cover to a first boss and a second boss at two ends of a grinding roller barrel to form a grinding roller body;
winding wear-resistant wires on the outer surface of the grinding roller body, wherein the wear-resistant wires are spiral, and the screw pitch is 2-7 mm, preferably 5 mm;
and fifthly, printing the wear-resistant alloy on the surfaces of the grinding roller body and the wear-resistant wires through 3D to form a wear-resistant alloy layer.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. The grinding roller of the Raymond grinding machine is characterized by comprising a grinding roller body (1), wherein a wear-resistant alloy layer (2) is arranged on the surface of the grinding roller body (1), and wear-resistant wires (3) are wound on one side, close to the grinding roller body (1), of the wear-resistant alloy layer (2).
2. The grinding roller of Raymond mill according to claim 1, characterized in that the wear resistant wires (3) are spirally wound on the surface of the grinding roller body (1) and the thread pitch is 2mm-7 mm.
3. A grinding roller of a raymond mill according to claim 1, characterized in that the grinding roller body (1) comprises a grinding roller cylinder (11), a first end cover (12) and a second end cover (13), the first end cover (11) and the second end cover (12) being fixedly connected with two ends of the grinding roller cylinder (11), respectively.
4. A grinding roller for a raymond mill according to claim 3, characterized in that the first end cap (12) is provided with a first conical shaft hole (4) in the centre for cooperation with a conical shaft, and the second end cap (13) is provided with a second conical shaft hole (5) in the centre for cooperation with a conical shaft.
5. A grinding roller of a raymond mill according to claim 3, characterized in that both ends of said roller barrel (11) are provided with a first boss (111) for mounting said first end cap (12) and a second boss (112) for mounting said second end cap (13), respectively.
6. A Raymond mill roller according to claim 5, characterised in that a plurality of through holes (113) arranged in an array are provided in the side walls of the mill roller barrel (11) corresponding to the first bosses (111) and the second bosses (112).
7. A Raymond mill grinding roller according to claim 6, characterised in that the side walls of the first end cover (12) and the second end cover (13) are provided with a plurality of blind holes (6), the blind holes (6) corresponding to the through holes (113) one to one.
8. A Raymond mill roller according to claim 7, characterised in that said first end cap (12) has a thickness equal to the height of the side wall of said first boss (111) and said second end cap (13) has a thickness equal to the height of the side wall of said second boss (112).
9. The manufacturing method of the grinding roller of the Raymond mill is characterized by comprising the following steps:
manufacturing a grinding roller, namely machining a first boss and a second boss at two ends of a cylindrical steel pipe through machining;
manufacturing a first end cover and a second end cover, wherein the outer diameters of the first end cover and the second end cover are matched with the calibers of a first boss and a second boss of the grinding roller, and a first conical shaft hole and a second conical shaft hole are processed in the centers of the first end cover and the second end cover through a drilling machine, so that after the first end cover and the second end cover are installed on the first boss and the second boss, the inner hole surface of the first conical shaft hole and the inner hole surface of the second conical shaft hole are in the same conical surface;
step three: respectively welding a first end cover and a second end cover to a first boss and a second boss at two ends of a grinding roller cylinder to form a grinding roller body;
winding wear-resistant wires on the outer surface of the grinding roller body, wherein the wear-resistant wires are spiral;
and fifthly, printing the wear-resistant alloy on the surfaces of the grinding roller body and the wear-resistant wires through 3D to form a wear-resistant alloy layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010352574.0A CN111514988B (en) | 2020-04-26 | 2020-04-26 | Raymond mill grinding roller and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010352574.0A CN111514988B (en) | 2020-04-26 | 2020-04-26 | Raymond mill grinding roller and manufacturing method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN111514988A true CN111514988A (en) | 2020-08-11 |
| CN111514988B CN111514988B (en) | 2023-08-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010352574.0A Active CN111514988B (en) | 2020-04-26 | 2020-04-26 | Raymond mill grinding roller and manufacturing method thereof |
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|---|---|---|---|---|
| CN2351199Y (en) * | 1998-09-13 | 1999-12-01 | 王应昂 | Water-cooling roller device for flour mill |
| CN2451224Y (en) * | 2000-09-28 | 2001-10-03 | 杨志俊 | Mill roller |
| CN201441929U (en) * | 2009-07-15 | 2010-04-28 | 济南万方炭素有限责任公司 | Composite wear-resistant grinding roller |
| CN102389851A (en) * | 2011-11-15 | 2012-03-28 | 吉林大学 | High toughness bionic wear resistant grinding roller |
| CN202387508U (en) * | 2011-12-07 | 2012-08-22 | 广州乾鼎焊接科技有限公司 | Wear-resistant grinding roll for vertical coal grinder |
| CN202460715U (en) * | 2012-03-02 | 2012-10-03 | 李晓明 | Grinding roller for intermediate-speed mill |
| CN202590853U (en) * | 2012-03-09 | 2012-12-12 | 甘肃农业大学 | Grinding roller |
| CN205667873U (en) * | 2016-06-06 | 2016-11-02 | 方大特钢科技股份有限公司 | Medium-speed pulverizer grinding roller seal combination mechanism |
| CN107236952A (en) * | 2017-06-15 | 2017-10-10 | 宝志坚 | A kind of laser melting coating nanometer metal ceramic grinding roller |
| CN208098214U (en) * | 2017-12-22 | 2018-11-16 | 江苏双发机械有限公司 | A kind of vertical mill roller sheet |
| CN212791222U (en) * | 2020-04-26 | 2021-03-26 | 四川宇广能科技有限公司 | Grinding roller of Raymond mill |
-
2020
- 2020-04-26 CN CN202010352574.0A patent/CN111514988B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2351199Y (en) * | 1998-09-13 | 1999-12-01 | 王应昂 | Water-cooling roller device for flour mill |
| CN2451224Y (en) * | 2000-09-28 | 2001-10-03 | 杨志俊 | Mill roller |
| CN201441929U (en) * | 2009-07-15 | 2010-04-28 | 济南万方炭素有限责任公司 | Composite wear-resistant grinding roller |
| CN102389851A (en) * | 2011-11-15 | 2012-03-28 | 吉林大学 | High toughness bionic wear resistant grinding roller |
| CN202387508U (en) * | 2011-12-07 | 2012-08-22 | 广州乾鼎焊接科技有限公司 | Wear-resistant grinding roll for vertical coal grinder |
| CN202460715U (en) * | 2012-03-02 | 2012-10-03 | 李晓明 | Grinding roller for intermediate-speed mill |
| CN202590853U (en) * | 2012-03-09 | 2012-12-12 | 甘肃农业大学 | Grinding roller |
| CN205667873U (en) * | 2016-06-06 | 2016-11-02 | 方大特钢科技股份有限公司 | Medium-speed pulverizer grinding roller seal combination mechanism |
| CN107236952A (en) * | 2017-06-15 | 2017-10-10 | 宝志坚 | A kind of laser melting coating nanometer metal ceramic grinding roller |
| CN208098214U (en) * | 2017-12-22 | 2018-11-16 | 江苏双发机械有限公司 | A kind of vertical mill roller sheet |
| CN212791222U (en) * | 2020-04-26 | 2021-03-26 | 四川宇广能科技有限公司 | Grinding roller of Raymond mill |
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| Publication number | Publication date |
|---|---|
| CN111514988B (en) | 2023-08-15 |
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