Grinding roller sleeve and manufacturing method thereof
阅读说明：本技术 一种磨辊辊套及其制造方法 (Grinding roller sleeve and manufacturing method thereof ) 是由 沈光明 李志强 蒋理想 高梦珂 吴正华 周钢群 王杰 楼慧卉 于 2019-10-31 设计创作，主要内容包括：一种磨辊辊套及其制造方法,其中,一种磨辊辊套,包括磨辊辊芯、金属辊套、金属陶瓷块以及调整垫片,所述磨辊辊芯和所述金属辊套的轴向截面均为中空圆台结构,所述磨辊辊芯设置于所述金属辊套的内侧,于所述金属辊套上间隔均匀地设置有多个嵌槽,于多个所述嵌槽内分别嵌入与所述嵌槽形状和大小相适配的金属陶瓷块,于所述金属陶瓷块和所述磨辊辊芯的间隙中插入所述调整垫片,通过调整垫片调整金属陶瓷块与磨辊辊芯的抵紧状况。通过机械结合的方式获得的磨辊辊套,该磨辊辊套耐磨材料占磨损表面积大、抗脱落且陶瓷颗粒分布均匀,有效改善现有方法制造的磨辊辊套所具有的缺陷。(The grinding roller sleeve comprises a grinding roller core, a metal roller sleeve, a metal ceramic block and an adjusting gasket, wherein the axial sections of the grinding roller core and the metal roller sleeve are both of a hollow round platform structure, the grinding roller core is arranged on the inner side of the metal roller sleeve, a plurality of caulking grooves are uniformly arranged on the metal roller sleeve at intervals, the metal ceramic block matched with the caulking grooves in shape and size is respectively embedded into the plurality of caulking grooves, the adjusting gasket is inserted into a gap between the metal ceramic block and the grinding roller core, and the abutting condition of the metal ceramic block and the grinding roller core is adjusted through the adjusting gasket. The grinding roller sleeve obtained by a mechanical combination mode has the advantages that the wear-resistant material of the grinding roller sleeve occupies a large wear surface area, is resistant to falling off, is uniform in ceramic particle distribution, and effectively overcomes the defects of the grinding roller sleeve manufactured by the existing method.)
1. The manufacturing method of the grinding roller sleeve is characterized by comprising the following steps:
1) manufacturing a metal ceramic block with a mechanical clamping shape, manufacturing a metal roller sleeve with an embedded groove, manufacturing a roller core of a grinding roller and a plurality of steel adjusting gaskets, and ensuring that the shape and the size of the embedded groove in the metal roller sleeve are matched with the shape and the size of the metal ceramic block;
2) arranging a metal ceramic block in an embedding groove of a metal roller sleeve;
3) the roller core of the grinding roller is conveyed into the inner side of the metal roller sleeve, and the abutting condition of the metal ceramic block and the roller core of the grinding roller is adjusted by an adjusting gasket to ensure that the roller core of the grinding roller, the metal ceramic block and the metal roller sleeve are abutted in the radial direction;
4) and axially pre-tightening the grinding roller sleeve and the metal roller core.
2. A method of manufacturing a grinding roll sleeve according to claim 1, wherein in step 1), the cermet block is manufactured by a bulk vacuum sintering process.
3. A method of manufacturing a grinding roll shell according to claim 1, wherein in step 1), the metal roll shell and the grinding roll core are separately manufactured by an integral sand casting method.
4. A method of manufacturing a grinding roll sleeve according to claim 1, wherein in step 4), the axial pretension factor against the grinding roll sleeve and the metal roll core is greater than or equal to 1.1.
5. The grinding roller sleeve of any one of claims 1 to 4, which comprises a grinding roller core, a metal roller sleeve, a metal ceramic block and an adjusting shim, wherein the axial sections of the grinding roller core and the metal roller sleeve are both in a hollow round platform structure, the grinding roller core is arranged on the inner side of the metal roller sleeve, a plurality of caulking grooves are uniformly arranged on the metal roller sleeve at intervals, the metal ceramic block matched with the shape and the size of the caulking grooves is respectively embedded in the plurality of caulking grooves, the adjusting shim is inserted into a gap between the metal ceramic block and the grinding roller core, and the abutting condition of the metal ceramic block and the grinding roller core is adjusted through the adjusting shim.
6. A grinding roll shell according to claim 5, wherein the radial cross-sections of the inner and outer side surfaces of the grinding roll core are circular and regular polygonal, respectively.
7. A grinding roll shell according to claim 5, wherein the outer side of the grinding roll core, the inner side of the metal roll shell and the outer side of the grinding roll shell are each provided with a taper in the axial direction thereof, and the taper of the outer side of the grinding roll core is the same as the taper of the inner side of the metal roll shell and the outer side thereof.
8. A grinding roll sleeve according to claim 5, wherein said cermet block has a "convex" configuration comprising a top layer configuration and a bottom layer configuration, said top layer configuration having a width less than a width of said bottom layer configuration.
9. The grinding roll shell according to claim 8, wherein the top surface of the top layer structure is arcuate and the curvature of the arcuate surface conforms to the curvature of the outer circumference of the metal roll shell, and the bottom surface of the bottom layer structure is planar and is adapted to be positioned in abutting engagement with the polygonal outer surface of the grinding roll core.
10. A grinding roller sleeve according to claim 8, characterized in that said cermet block has a length of 200-400mm, a width of 50-150mm and a thickness of 30-50mm, and the difference in width between said underlying structure and said overlying structure is greater than or equal to 40 mm.
Technical Field
The invention relates to the field of coal mills, in particular to a grinding roller sleeve for a coal mill and a manufacturing method thereof.
Background
The grinding roller sleeve of the coal mill is a key wearing part in powder making equipment of a power station, and is generally short in service life due to the fact that the service environment is severe, and metal ceramics are mostly adopted as wear-resistant materials of the roller sleeve at present for prolonging the service life of the grinding roller sleeve of the coal mill.
The manufacturing method of the metal ceramic composite grinding roller sleeve for the existing coal mill comprises the following steps:
1) the grinding roller sleeve is made of a prefabricated ceramic-metal matrix composite material. According to the method, a strip-shaped metal wear-resistant plate with good toughness and low hardness is used as a base body, holes are punched in the metal wear-resistant plate (such as a steel plate), then wear-resistant ceramic materials with poor toughness and high hardness are embedded in the holes of the metal wear-resistant plate in an interference fit mode, for example, honeycomb holes are formed in the wear-resistant plate, the wear-resistant ceramic materials are radially pressed into the holes, and therefore the wear-resistant plate made of a ceramic-metal matrix composite material is prefabricated and then embedded on the surface of a grinding roller. Compared with the grinding roller sleeve which is made of high-chromium cast iron as a wear-resistant material, the grinding roller sleeve manufactured by the method has better wear-resistant effect and longer service life. However, the service life of the wear-resistant ceramic material is improved limitedly because the area of the whole roll surface occupied by the wear-resistant ceramic material is smaller, and the wear-resistant ceramic material and the metal wear-resistant plate have larger difference in physical properties such as elastic modulus, thermal expansion coefficient and the like, so that the wear-resistant ceramic material embedded in the hole of the metal wear-resistant plate falls off and cannot be repaired under the dual actions of the working temperature rise of the coal mill and the coal briquette extrusion force;
2) the ceramic-metal composite material grinding roller sleeve is integrally cast by adopting a mechanical stirring mode. The method comprises the steps of putting fine ceramic particles into molten metal of molten wear-resistant cast iron, adopting a mechanical stirring mode to force the ceramic particles with different densities to be fully mixed with the molten metal and enable the ceramic particles to be uniformly dispersed in the molten metal as much as possible, then pouring the molten metal mixed with the ceramic particles into a prefabricated model, cooling and solidifying the prefabricated model to obtain a casting blank of the roller sleeve of the grinding roller, cleaning the casting blank, and then installing the casting blank on the surface of the grinding roller to form the grinding roller. The manufacturing method has simple process and low cost. However, the density difference between the ceramic particles and the molten metal is very large, the ceramic particles can only suspend on the surface of the molten metal, and interface wetting reaction is not easy to occur, so that the defects of air holes, shrinkage cavities, interface debonding, particle shedding and the like are easily caused in the preparation of the composite material;
3) the roll sleeve of the grinding roll made of the ceramic-metal composite material is manufactured by adopting an infiltration casting method. The method needs to prefabricate a strip-shaped ceramic framework, then fixes the ceramic framework in a casting cavity, pours molten wear-resistant cast iron into the cavity, and obtains the grinding roller sleeve made of the ceramic-metal composite material after the ceramic framework is cooled and solidified. The method has the problems of incomplete penetration, small dispersion degree of ceramic particles, easy collapse of the prefabricated body by molten metal, poor process stability and the like.
4) The ceramic-metal composite material grinding roller sleeve is manufactured by a centrifugal casting method. The method solves the problems of incomplete penetration, small ceramic particle dispersion degree and the like caused by the traditional gravity casting, but because the density of the ceramic particles is greatly different from that of the iron-based metal melt, the ceramic particles can only be suspended on the surface of the metal melt and are not easy to generate interface wetting reaction, so that the defects of interface debonding, particle shedding and the like still exist. In summary, the existing methods for manufacturing various grinding roller sleeves made of ceramic-metal composite materials have some problems, and cannot meet the requirements of large wear surface area, falling resistance and uniform distribution of ceramic particles of wear-resistant materials of grinding rollers of coal mills, and effective innovation needs to be carried out on the prior art aiming at the defects.
Disclosure of Invention
The invention aims to provide a grinding roller sleeve and a manufacturing method thereof, and the grinding roller sleeve obtained by a mechanical combination mode can be manufactured by the method, the wear-resistant material of the grinding roller sleeve occupies a large wear surface area, is anti-shedding, has uniform ceramic particle distribution, and effectively overcomes the defects of the grinding roller sleeve manufactured by the existing method.
In order to achieve the purpose, the invention adopts the following technical scheme:
a manufacturing method of a grinding roller sleeve comprises the following steps:
1) manufacturing a metal ceramic block with a mechanical clamping shape, manufacturing a metal roller sleeve with an embedded groove, manufacturing a roller core of a grinding roller and a plurality of steel adjusting gaskets, and ensuring that the shape and the size of the embedded groove in the metal roller sleeve are matched with the shape and the size of the metal ceramic block;
2) arranging a metal ceramic block in an embedding groove of a metal roller sleeve;
3) the roller core of the grinding roller is conveyed into the inner side of the metal roller sleeve, and the abutting condition of the metal ceramic block and the roller core of the grinding roller is adjusted by an adjusting gasket to ensure that the roller core of the grinding roller, the metal ceramic block and the metal roller sleeve are abutted in the radial direction;
4) axially pre-tightening a grinding roller sleeve and a metal roller core;
correspondingly, in the step 1), the cermet block is manufactured by adopting an integral vacuum sintering method;
correspondingly, in the step 1), a metal roller sleeve and a grinding roller core are respectively manufactured by adopting an integral sand casting method;
correspondingly, in the step 4), the axial pre-tightening coefficient of the roller sleeve of the grinding roller and the metal roller core is more than or equal to 1.1.
A grinding roller sleeve comprises a grinding roller core, a metal roller sleeve, a metal ceramic block and an adjusting gasket, wherein the axial sections of the grinding roller core and the metal roller sleeve are both in a hollow round platform structure, the grinding roller core is arranged on the inner side of the metal roller sleeve, a plurality of caulking grooves are uniformly arranged on the metal roller sleeve at intervals, the metal ceramic block matched with the shape and size of the caulking grooves is respectively embedded into the caulking grooves, the adjusting gasket is inserted into a gap between the metal ceramic block and the grinding roller core, and the abutting condition of the metal ceramic block and the grinding roller core is adjusted through the adjusting gasket;
correspondingly, the radial sections of the inner side surface and the outer side surface of the grinding roller core are respectively circular and regular polygons, and the outer side surface of the grinding roller core is set to be a regular polygon, so that the metal ceramic block is convenient to set and position on one hand, and the metal ceramic block is not easy to shift and move after being fixed on the other hand;
correspondingly, the outer side surface of the grinding roller core, the inner side surface and the outer side surface of the metal roller sleeve are provided with tapers in the axial direction, and the taper of the outer side surface of the grinding roller core is the same as the taper of the inner side surface and the outer side surface of the metal roller sleeve, so that the grinding roller core and the roller sleeve can be conveniently butted;
correspondingly, the metal ceramic block is a convex structure consisting of a top layer structure and a bottom layer structure, and the width of the top layer structure is smaller than that of the bottom layer structure;
correspondingly, the top surface of the top layer structure is an arc surface, the radian of the arc surface is matched with the radian of the outer circumference of the metal roller sleeve, and the bottom surface of the bottom layer structure is a plane structure and is convenient to be in butt joint with the polygonal outer side surface of the roller core of the grinding roller;
correspondingly, the length of the metal ceramic block is 200-400mm, the width is 50-150mm, the thickness is 30-50mm, and the width difference between the bottom layer structure and the top layer structure is more than or equal to 40mm, so that sufficient clamping force exists between the bottom layer and the metal roller sleeve.
The invention has the beneficial effects that: the cermet piece and the metal roller sleeve are mechanically combined, so that even if the cermet piece with a large volume is fixed in the metal roller sleeve, the firmness of the combination of the cermet piece and the metal roller sleeve can be ensured, the cermet piece occupies a large wear surface area, and the anti-shearing and anti-falling performance of the cermet piece is improved.
Drawings
FIG. 1 is a schematic view of a radial configuration of a grinding roll sleeve according to an embodiment of the present invention;
FIG. 2 is a schematic axial view of a grinding roll sleeve according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a cermet block according to an embodiment of the present invention;
FIG. 4 is a schematic illustration of a metal sleeve according to an embodiment of the present invention;
in the figure:
1. a grinding roller core;
2. a metal roller shell; 21. caulking grooves;
3. a cermet block; 31. a top layer structure; 32. a top surface; 33. a substructure; 34. a bottom surface;
4. and adjusting the gasket.
Detailed Description
As shown in fig. 1-4, in one embodiment of the present invention, a grinding roll sleeve comprises a
in the axial direction, the sections of the
in the radial direction, the sections of the inner side surface and the outer side surface of the
a plurality of
According to the tight abutting condition of the metal
In order to obtain the grinding roller sleeve, the following method is adopted in the embodiment:
1) the method comprises the following steps of manufacturing a metal
2) arranging a metal
3) the grinding
4) the
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
- 上一篇：一种医用注射器针头装配设备
- 下一篇：米粉加工磨盘及其加工设备