CN108579921B - Novel wear-resisting tower mill - Google Patents

Novel wear-resisting tower mill Download PDF

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Publication number
CN108579921B
CN108579921B CN201810258817.7A CN201810258817A CN108579921B CN 108579921 B CN108579921 B CN 108579921B CN 201810258817 A CN201810258817 A CN 201810258817A CN 108579921 B CN108579921 B CN 108579921B
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lining plate
ceramic
protective lining
blade
welt
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CN108579921A (en
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蒋业华
薛达
张孝足
王楠
韦鸿铭
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Kunming University of Science and Technology
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Kunming University of Science and Technology
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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
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/16—Mills in which a fixed container houses stirring means tumbling the charge
    • B02C17/163—Stirring means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/18—Details
    • B02C17/22—Lining for containers
    • 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
    • B22D19/02—Casting in, on, or around objects which form part of the product for making reinforced articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B1/00—Producing shaped prefabricated articles from the material
    • B28B1/14—Producing shaped prefabricated articles from the material by simple casting, the material being neither forcibly fed nor positively compacted
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    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
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    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
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    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
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Abstract

The invention discloses a novel wear-resistant tower mill, which comprises a transmission system, a tower body, a spiral stirrer and a protective lining plate, wherein the transmission system and the tower body are of a conventional structure, the protective lining plate comprises a side protective lining plate and a bottom protective lining plate, the side protective lining plate is formed by splicing more than two right-angled trapezoids, the right-angled trapezoids are in clearance fit, the bottom circular protective lining plate is in a circular shape by splicing more than two fan rings, the fan rings are in clearance fit, and the protective lining plate is a composite material lining plate; the protective lining plate is made of ceramic/metal matrix composite, and due to the existence of ceramic particles, austenite crystal grains in a matrix of the composite are reduced, crystal boundaries are increased, the interface energy is increased, dislocation movement is blocked, the hardness of the material is improved, the wear resistance is improved, the service life of the tower mill can be obviously prolonged, the maintenance cost is reduced, and the production efficiency is improved.

Description

Novel wear-resisting tower mill
Technical Field
The invention relates to a novel wear-resistant tower mill, and belongs to the field of mechanical equipment of tower mills.
Background
The tower mill is widely applied to industries such as cement building materials and the like as a high-efficiency and energy-saving crushing device. In recent years, with rapid national development, demands for raw materials such as minerals have been increasing, and the consumption of tower mills has been increasing year by year. However, the conventional tower mill has short service life, high maintenance cost, long repair time, high repair cost and low production efficiency, and is difficult to meet the requirements of the current market. In order to solve the problems faced by the reality, a new wear-resistant tower mill is produced. The high toughness of the metal material is utilized to improve the impact resistance and the shearing resistance, and the ceramic particles in the composite material area are wear-resistant media. The tower mill has good wear resistance, pressure resistance and impact resistance, has certain high temperature resistance, and is suitable for more severe working conditions.
Chinese patent CN104549661A discloses a tower mill, in which the supporting system is a closed structure, and the bottom ends of the first and second helical blade sets are connected to a double-head material taking blade fixed on a screw shaft. Thereby improving the grinding efficiency of the tower mill. However, this method is too cumbersome to install and replace the protective liner. The chinese invention patent CN 104174467A discloses a tower mill, in which a wear-resistant plate is welded with the side wall of the housing of the tower mill through a rib plate to prolong the service life of the equipment, but the method does not consider the wear of the helical blade, and when the service life of the helical blade is low, the frequency is increased to replace the helical blade, thereby increasing the manufacturing cost of the tower mill and reducing the mechanical efficiency of the tower mill.
Disclosure of Invention
The invention aims to solve the problems of poor wear resistance, short service life, trouble in replacement of a protective lining plate and the like of a spiral stirrer blade and the protective lining plate of a traditional tower mill, and provides a novel wear-resistant tower mill.
The invention provides a novel wear-resistant tower mill which comprises a transmission system, a tower body, a spiral stirrer and a protective lining plate, wherein the transmission system and the tower body are of conventional structures, the protective lining plate comprises a side protective lining plate and a bottom protective lining plate, the spiral stirrer is arranged in the middle of the tower body, the side protective lining plate is arranged on the side surface of the inner wall of the tower body, the bottom protective lining plate is arranged on the bottom surface of the inner wall of the tower body, the side protective lining plate is formed by splicing more than two right-angled trapezoids, the right-angled trapezoids are in clearance fit, the bottom circular protective lining plate is formed by splicing more than two fan rings into a circle, the fan rings are in clearance fit, the protective lining plate is a composite material lining plate.
The preparation method of the spiral stirrer blade and the protective lining plate comprises the following specific steps:
uniformly mixing ceramic micro powder, adding absolute ethyl alcohol, wherein the absolute ethyl alcohol accounts for 6-10% of the mass of the ceramic micro powder, performing ball milling for 2-4 hours to obtain mixed ceramic micro powder, mixing the mixed ceramic micro powder with ceramic particles, the mixed ceramic micro powder accounts for 3-11% of the mass of the ceramic particles, adding a binder accounting for 4-6% of the mass of the ceramic particles, uniformly stirring, filling the mixture into a honeycomb-shaped die, sintering, and demolding to obtain a honeycomb-shaped ceramic preform;
when the spiral stirrer blade is prepared, fixing the prepared ceramic preform on the position of the working surface of the spiral stirrer blade in the cavity, casting metal liquid with the mass 8-10 times that of the ceramic preform, enabling the metal liquid to react with ceramic particles in the preform, cooling, demoulding, and performing heat treatment to obtain the spiral stirrer blade;
when the protective lining plate is prepared, the prepared ceramic preform is fixed on the position of the working surface of the protective lining plate in the cavity for casting, metal liquid with the mass 8-10 times that of the ceramic preform is cast, the metal liquid reacts with ceramic differential in the preform, and the protective lining plate is obtained after cooling, demolding and heat treatment.
The ceramic micro powder is TiO2、TiC、TiB2、Si3N4、BN、TiN、Al2O3、ZrO 24 or more than 4 of CaO, WC and AlN, and the granularity of each ceramic micro powder is 1200-1500 meshes.
The ceramic particles are alumina, zirconia corundum, silicon carbide, tungsten carbide or boron nitride particles, and the particle size of the ceramic particles is 30-150 meshes.
The binder is water glass, silica sol, aluminum dihydrogen phosphate, polyvinyl alcohol or polyvinyl butyral.
The sintering process comprises the following steps: heating to 530-570 ℃ at the heating rate of 5-7 ℃/min, preserving heat for 2-4 hours, and cooling along with the furnace.
The metal of the molten metal is high manganese steel or medium chromium alloy wear-resistant steel.
The casting is pressureless infiltration sand casting, and the molding sand is sodium silicate sand.
The heat treatment process comprises the following steps: the heat treatment process when the molten metal is high manganese steel molten metal comprises the following steps: heating to 650-750 ℃ at a speed of 3 ℃/min, preserving heat for 1.5-2.5h, heating to 1100-1200 ℃ at a speed of 2 ℃/min, preserving heat for 2-3h, and then water quenching until the temperature is cooled to room temperature; the heat treatment process when the molten metal is medium chromium alloy wear-resistant steel molten metal comprises the following steps: heating to 980-1200 ℃ at the speed of 3 ℃/min, quenching until the temperature is cooled to the room temperature, and then tempering at the temperature of 500-600 ℃.
Compared with the prior art, the invention has the beneficial effects that:
1. the spliced protective lining plate is more convenient to replace, and the working efficiency of the tower mill is improved.
2. According to the invention, the composite material is adopted to prepare the helical stirrer blade and the protective lining plate, so that the helical stirrer blade and the protective lining plate not only have the toughness and plasticity of metal, but also have the hardness and wear resistance of ceramic material, the wear resistance of the helical stirrer blade and the protective lining plate is greatly improved, and the service life is prolonged.
3. The present invention uses a honeycomb preform to achieve a thicker composite zone.
4. The invention adopts a simple gravity casting process, simplifies the production process and saves the production cost.
5. According to the invention, the ceramic micro powder coated on the surface of the ceramic particle reacts with the metal liquid, so that the infiltration of the metal liquid into the ceramic particle prefabricated body is promoted, the composite effect of the ceramic particle and the metal liquid is improved, and the service lives of the spiral stirrer and the protective lining plate are prolonged.
Drawings
FIG. 1 is a schematic view of a tower mill according to example 1 of the present invention;
FIG. 2 is a schematic view of a helical agitator according to example 1 of the present invention;
FIG. 3 is a schematic view of a bottom protective liner of example 1 of the present invention;
FIG. 4 is a working surface of a blade of a zircon corundum particle/high manganese steel-based helical agitator according to example 1 of the present invention;
in the figure, 1-a transmission system, 2-a tower body, 3-a spiral stirrer, 4-a side protective lining plate and 5-a bottom protective lining plate.
Detailed Description
The invention is described in further detail below with reference to the figures and the specific embodiments.
Example 1
A novel wear-resistant tower mill is shown in figures 1-3 and comprises a transmission system 1, a tower body 2, a spiral stirrer 3 and a protection lining plate, wherein the transmission system and the tower body are of a conventional structure, the protection lining plate comprises a side protection lining plate 5 and a bottom protection lining plate 4, the spiral stirrer 3 is arranged in the middle of the tower body 1, the side protection lining plate 5 is arranged on the side surface of the inner wall of the tower body 1, the bottom protection lining plate 4 is arranged on the bottom surface of the inner wall of the tower body 2, the side protection lining plate of each side is formed by splicing two right trapezoid bodies, in addition, the two right trapezoid bodies are in clearance fit, the bottom circular protection lining plate is spliced into a circular ring by four same fan rings, in addition, the fan rings are in clearance fit, the protection lining plate is a composite material lining.
The preparation method of the spiral stirrer blade and the protective lining plate comprises the following steps:
TiO of 1200 mesh2、TiC、TiB2、TiN、ZrO2After mixing according to the mass ratio of 1:1:1:1:1, adding absolute ethyl alcohol with the mass fraction of the mixed micro powder being 6% to perform ball milling for 2 hours to obtain mixed ceramic micro powder, mixing the mixed ceramic micro powder with 30-mesh zirconium corundum ceramic particles, wherein the mixed ceramic micro powder accounts for 3% of the mass of the zirconium corundum ceramic particles, after uniform mixing, adding water glass with the mass fraction of 6% of the mass of the zirconium corundum ceramic particles as a binder, uniformly stirring to obtain uniform slurry, filling the slurry into a honeycomb mold, drying and demolding to obtain a honeycomb preform, putting the preform into a box furnace, heating to 530 ℃ at the heating rate of 5 ℃/min, keeping the temperature for 2 hours, cooling along with the furnace, and demolding to obtain the honeycomb ceramic preform;
when the spiral stirrer blade is prepared, the prepared ceramic preform is fixed on the position of the working surface of the spiral stirrer blade in the cavity for casting, the casting is non-pressure infiltration sand casting, the molding sand is sodium silicate sand, high manganese steel molten metal with the mass 8 times that of the ceramic preform is cast, and the high manganese steel molten metal comprises the following components: 1.2%, Mn: 12%, Si: 0.5 percent of S is less than or equal to 0.05 percent of P, less than or equal to 0.10 percent of P, the balance of Fe, the high manganese steel metal liquid reacts with the ceramic differential in the prefabricated body, a blank body is obtained after cooling and demoulding, the blank body is subjected to heat treatment, and the heat treatment process comprises the following steps: heating to 650 ℃ at a speed of 3 ℃/min, preserving heat for 1.5h, heating to 1100 ℃ at a speed of 2 ℃/min, preserving heat for 2h, and performing water quenching until the temperature is cooled to room temperature to obtain a spiral stirrer blade;
when the protective lining plate is prepared, the prepared ceramic preform is fixed in a cavity of a working surface of the protective lining plate for casting, the casting is non-pressure infiltration sand casting, the molding sand is sodium silicate sand, high manganese steel molten metal with the mass 9 times that of the ceramic preform is cast, and the high manganese steel molten metal comprises the following components: 1.2%, Mn: 12%, Si: 0.5 percent of S is less than or equal to 0.05 percent of P, less than or equal to 0.10 percent of P, the balance of Fe, the high manganese steel metal liquid reacts with the ceramic differential in the prefabricated body, a blank body is obtained after cooling and demoulding, the blank body is subjected to heat treatment, and the heat treatment process comprises the following steps: heating to 650 ℃ at a speed of 3 ℃/min, preserving heat for 1.5h, heating to 1100 ℃ at a speed of 2 ℃/min, preserving heat for 2h, and quenching with water until the temperature is cooled to room temperature to obtain the protective lining plate.
The working surface of the spiral stirrer blade prepared in the embodiment is shown in fig. 4, the base metal of the spiral stirrer blade has better toughness and can bear certain impact force, the composite material on the surface layer is uniformly distributed with the corundum-zirconia particles, the wear resistance of the spiral stirrer blade and the protective lining plate is improved by 2.5 times compared with that of the conventional metal material, and the service life of the spiral stirrer blade is prolonged by 3 times.
Example 2
The utility model provides a novel wear-resisting tower mill, including transmission system, the tower body, the helical agitator, the protection welt, transmission system, the tower body is conventional structure, the protection welt includes side protection welt and bottom surface protection welt, the helical agitator sets up in the middle of the tower body, the side protection welt sets up in tower body inner wall side, the bottom surface protection welt sets up in tower body inner wall bottom surface, the side protection welt is formed by two right trapezoid concatenations, and be clearance fit between two right trapezoid, the circular protection welt in bottom surface is the ring by two the concatenation of the same fan ring, and be clearance fit between the fan ring, the protection welt is the combined material welt, the helical agitator blade is the combined material blade.
The preparation method of the spiral stirrer and the protective lining plate comprises the following specific steps:
adding 1500 mesh TiO2、TiC、TiB2Mixing TiN according to the mass ratio of 1:1:1:1, adding absolute ethyl alcohol with the mass fraction of the mixed micro powder being 10% to perform ball milling for 4 hours to obtain mixed ceramic micro powder, mixing the mixed ceramic micro powder with 150-mesh alumina ceramic particles, adding silica sol with the mass fraction of the mixed ceramic micro powder being 11% of that of the alumina ceramic particles to perform uniform mixing, adding silica sol with the mass fraction of the alumina ceramic particles being 6% of that of the alumina ceramic particles to perform uniform stirring to obtain uniform slurry, filling the slurry into a honeycomb mold, performing drying and demolding to obtain a honeycomb preform, putting the preform into a box furnace, heating to 570 ℃ at the heating rate of 7 ℃/min, performing heat preservation for 4 hours, performing furnace cooling, and performing demolding to obtain the honeycomb ceramic preform;
when the spiral stirrer blade is prepared, a plurality of prepared ceramic preforms are fixed on the position of the working surface of the spiral stirrer blade in the cavity for casting, the casting is non-pressure infiltration sand casting, the molding sand is sodium silicate sand, high manganese steel molten metal with the mass 9 times that of the ceramic preforms is cast, and the high manganese steel molten metal comprises the following components: 1.5%, Mn: 15%, Si: 0.3 percent of S is less than or equal to 0.05 percent of P, less than or equal to 0.10 percent of P and the balance of iron, the molten metal reacts with the ceramic differential in the prefabricated body, a blank is obtained after cooling and demoulding, the blank is subjected to heat treatment, and the heat treatment process comprises the following steps: heating to 750 ℃ at a speed of 3 ℃/min, preserving heat for 2.5h, heating to 1200 ℃ at a speed of 2 ℃/min, preserving heat for 3h, and performing water quenching until the temperature is cooled to room temperature to obtain a spiral stirrer blade;
when the protective lining plate is prepared, the prepared ceramic preform is fixed in a cavity of a working surface of the protective lining plate for casting, the casting is non-pressure infiltration sand casting, the molding sand is high manganese steel molten metal with the mass 8 times that of the ceramic preform cast by sodium silicate sand, and the high manganese steel molten metal comprises the following components: 1.5%, Mn: 15%, Si: 0.3 percent of S is less than or equal to 0.05 percent of P, less than or equal to 0.10 percent of P, the balance of Fe, the molten high manganese steel reacts with the ceramic differential in the prefabricated body, a blank body is obtained after cooling and demoulding, the blank body is subjected to heat treatment, and the heat treatment process comprises the following steps: heating to 750 ℃ at a speed of 3 ℃/min, preserving heat for 2.5h, heating to 1200 ℃ at a speed of 2 ℃/min, preserving heat for 3h, and then quenching with water until the temperature is cooled to room temperature to obtain the protective lining plate.
The base metal of the blade and the protective lining plate of the spiral stirrer prepared by the embodiment has better toughness and can bear certain impact force, the alumina ceramic particles are uniformly distributed on the surface layer composite material, the wear resistance of the blade and the protective lining plate of the spiral stirrer is improved by 3 times compared with that of the blade and the protective lining plate of the conventional metal material, and the service life of the blade and the protective lining plate of the spiral stirrer is prolonged by 3.5 times.
Example 3
The utility model provides a novel wear-resisting tower mill, including transmission system, the tower body, the helical agitator, the protection welt, transmission system, the tower body is conventional structure, the protection welt includes side protection welt and bottom surface protection welt, the helical agitator sets up in the middle of the tower body, the side protection welt sets up in tower body inner wall side, the bottom surface protection welt sets up in tower body inner wall bottom surface, single face side protection welt is formed by two right trapezoid concatenations, and be clearance fit between two right trapezoid, the circular protection welt in bottom surface is the ring by 4 the concatenation of the same fan ring, and be clearance fit between the fan ring, the protection welt is the combined material welt, the helical agitator blade is the combined material blade.
The preparation method of the spiral stirrer blade and the protective lining plate comprises the following steps:
TiO of 1350 mesh2、TiC、TiB2Mixing TiN, WC and AlN according to a mass ratio of 1:1:1:1:1:1, adding absolute ethyl alcohol with a mass fraction of 8% of the mixed micro powder, performing ball milling for 3 hours to obtain mixed ceramic micro powder, mixing the mixed ceramic micro powder with 90-mesh silicon carbide ceramic particles, adding aluminum dihydrogen phosphate with a mass fraction of 5% of the silicon carbide ceramic particles as a binder after uniformly mixing, uniformly stirring to obtain uniform slurry, filling the slurry into a honeycomb mold, drying and demolding to obtain a honeycomb preform, putting the preform into a box furnace, heating to 550 ℃ at a heating rate of 6 ℃/min, preserving heat for 3 hours, then cooling with the furnace, and demolding to obtain the honeycomb ceramic preform;
when the spiral stirrer blade is prepared, a plurality of prepared ceramic preforms are fixed on the position of the working surface of the spiral stirrer blade in the cavity for casting, the casting is non-pressure infiltration sand casting, the molding sand is sodium silicate sand, high manganese steel molten metal with 10 times of the mass of the ceramic preforms is cast, and the high manganese steel molten metal comprises the following components: 0.9%, Mn: 10%, Si: 1.0 percent of S is less than or equal to 0.05 percent of P is less than or equal to 0.10 percent of P, the balance is iron, the molten metal reacts with the ceramic differential in the prefabricated body, a blank is obtained after cooling and demoulding, the blank is subjected to heat treatment, and the heat treatment process comprises the following steps: heating to 700 ℃ at a speed of 3 ℃/min, preserving heat for 2h, heating to 1150 ℃ at a speed of 2 ℃/min, preserving heat for 2.5h, and quenching with water until cooling to room temperature to obtain a spiral stirrer blade;
when the protective lining plate is prepared, the prepared ceramic preform is fixed in a cavity of a working surface of the protective lining plate for casting, the casting is non-pressure infiltration sand casting, the molding sand is sodium silicate sand, high manganese steel molten metal with the mass 8 times that of the ceramic preform is cast, and the high manganese steel molten metal comprises the following components: 0.9%, Mn: 10%, Si: 1.0 percent of S is less than or equal to 0.05 percent of P, less than or equal to 0.10 percent of P, the balance of Fe, the high manganese steel metal liquid reacts with the ceramic differential in the prefabricated body, a blank body is obtained after cooling and demoulding, the blank body is subjected to heat treatment, and the heat treatment process comprises the following steps: heating to 700 ℃ at a speed of 3 ℃/min, preserving heat for 2h, heating to 1150 ℃ at a speed of 2 ℃/min, preserving heat for 2.5h, and quenching with water until the temperature is cooled to room temperature to obtain the protective lining plate.
The matrix metal of the spiral stirrer blade and the protective lining plate prepared by the embodiment has better toughness and can bear certain impact force, the silicon carbide ceramic particles are uniformly distributed on the surface layer composite material, the wear resistance of the spiral stirrer blade and the protective lining plate is improved by 2 times compared with that of the conventional metal material, and the service life of the spiral stirrer blade and the protective lining plate is prolonged by 3 times.
Example 4
The utility model provides a novel wear-resisting tower mill, including transmission system, the tower body, the helical agitator, the protection welt, transmission system, the tower body is conventional structure, the protection welt includes side protection welt and bottom surface protection welt, the helical agitator sets up in the middle of the tower body, the side protection welt sets up in tower body inner wall side, the bottom surface protection welt sets up in tower body inner wall bottom surface, single face side protection welt is formed by eight right trapezoid concatenations, and be clearance fit between two right trapezoid, the circular protection welt in bottom surface is the ring by 4 the concatenation of the same fan ring, and be clearance fit between the fan ring, the protection welt is the combined material welt, the helical agitator blade is the combined material blade.
The preparation method of the spiral stirrer blade and the protective lining plate comprises the following steps:
mixing 1300 mesh TiO2、TiC、TiB2Mixing TiN and WC according to the mass ratio of 1:1:1:1:1, adding absolute ethyl alcohol with the mass fraction of 7% of the mixed micro powder, performing ball milling for 3.5 hours to obtain mixed ceramic micro powder, mixing the mixed ceramic micro powder with 80-mesh silicon carbide ceramic particles, adding polyvinyl alcohol with the mass fraction of 4.5% of the silicon carbide ceramic particles as a binder after uniform mixing, uniformly stirring to obtain uniform slurry, filling the slurry into a honeycomb mold, drying and demolding to obtain a honeycomb preform, putting the preform into a box furnace, heating to 555 ℃ at the heating rate of 7 ℃/min, preserving heat for 2.5 hours, then cooling along with the furnace, and demolding to obtain the honeycomb ceramic preform;
when the spiral stirrer blade is prepared, a plurality of prepared ceramic preforms are fixed on the position of the working surface of the spiral stirrer blade in a cavity for casting, the casting is non-pressure infiltration sand casting, the molding sand is sodium silicate sand, medium-chromium alloy wear-resistant steel molten metal with the mass 8.5 times of that of the ceramic preforms is cast, and the medium-chromium alloy wear-resistant steel molten metal comprises the following components: 0.5%, Cr 5%, Mn: 1%, Si: 1.0%, Mo: 0.6 percent of Ni is less than or equal to 1.0 percent, P is less than or equal to 0.04 percent, S is less than or equal to 0.04 percent, the balance is iron, the molten metal reacts with the ceramic differential in the prefabricated body, the prefabricated body is cooled and demoulded to obtain a blank body, the blank body is subjected to heat treatment, and the heat treatment process comprises the following steps: heating to 980 ℃ at the speed of 3 ℃/min, quenching, cooling to room temperature, and tempering at 500 ℃ to obtain a spiral stirrer blade;
when the protective lining plate is prepared, the prepared ceramic preform is fixed on the position of the working surface of the protective lining plate in the cavity for casting, the casting is pressureless infiltration sand casting, the molding sand is sodium silicate sand, medium-chromium alloy wear-resistant steel molten metal with the mass 8.5 times of that of the ceramic preform is cast, and the medium-chromium alloy wear-resistant steel molten metal comprises the following components: 0.5%, Cr 5%, Mn: 1%, Si: 1.0%, Mo: 0.6 percent of Ni is less than or equal to 1.0 percent, P is less than or equal to 0.04 percent, S is less than or equal to 0.04 percent, the balance is iron, the molten metal reacts with the ceramic differential in the prefabricated body, the prefabricated body is cooled and demoulded to obtain a blank body, the blank body is subjected to heat treatment, and the heat treatment process comprises the following steps: heating to 980 ℃ at the speed of 3 ℃/min, quenching, cooling to room temperature, and tempering at 500 ℃ to obtain the protective lining plate.
The matrix metal of the spiral stirrer blade and the protective lining plate prepared by the embodiment has better toughness and can bear certain impact force, the silicon carbide ceramic particles are uniformly distributed on the surface layer composite material, the wear resistance of the spiral stirrer blade and the protective lining plate is improved by 3 times compared with that of the conventional metal material, and the service life of the spiral stirrer blade and the protective lining plate is prolonged by 4 times.
Example 5
The utility model provides a novel wear-resisting tower mill, including transmission system, the tower body, the helical agitator, the protection welt, transmission system, the tower body is conventional structure, the protection welt includes side protection welt and bottom surface protection welt, the helical agitator sets up in the middle of the tower body, the side protection welt sets up in tower body inner wall side, the bottom surface protection welt sets up in tower body inner wall bottom surface, single face side protection welt is formed by four right trapezoid concatenations, and be clearance fit between two right trapezoid, the circular protection welt in bottom surface is the ring by 8 the concatenation of the same fan ring, and be clearance fit between the fan ring, the protection welt is the combined material welt, the helical agitator blade is the combined material blade.
The preparation method of the spiral stirrer blade and the protective lining plate comprises the following steps:
mixing 1300 mesh TiN, Al2O3、ZrO2Mixing CaO, WC and AlN according to the mass ratio of 1:1:1:1:1:1, adding absolute ethyl alcohol with the mass fraction of the mixed micro powder of 8 percent to perform ball milling for 3 hours to obtain mixed ceramic micro powder, mixing the mixed ceramic micro powder with 60-mesh boron nitride ceramic particles, adding polyvinyl alcohol with the mass fraction of 4.5 percent of the boron nitride ceramic particles as a binder after uniformly mixing the mixed ceramic micro powder and the boron nitride ceramic particles to obtain uniform slurry, filling the slurry into a honeycomb mouldDrying and demoulding to obtain a honeycomb-shaped prefabricated body, putting the prefabricated body into a box-type furnace, heating to 570 ℃ at the heating rate of 7 ℃/min, preserving heat for 2.5 hours, cooling along with the furnace, and demoulding to obtain a honeycomb-shaped ceramic prefabricated body;
when the spiral stirrer blade is prepared, a plurality of prepared ceramic preforms are fixed on the position of the working surface of the spiral stirrer blade in a cavity for casting, the casting is non-pressure infiltration sand casting, the molding sand is sodium silicate sand, medium-chromium alloy wear-resistant steel molten metal with the mass 9.5 times of that of the ceramic preforms is cast, and the medium-chromium alloy wear-resistant steel molten metal comprises the following components: 0.55%, Cr:4%, Mn: 1.2%, Si: 0.4%, Mo: 0.2 percent of Ni, less than or equal to 1.0 percent of Ni, less than or equal to 0.04 percent of P, less than or equal to 0.04 percent of S and the balance of iron, the molten metal reacts with the ceramic differential in the prefabricated body, the prefabricated body is cooled and demoulded to obtain a blank body, the blank body is subjected to heat treatment, and the heat treatment process comprises the following steps: heating to 1200 ℃ at the speed of 3 ℃/min, quenching, cooling to room temperature, and tempering at the temperature of 600 ℃ to obtain a spiral stirrer blade;
when the protective lining plate is prepared, the prepared ceramic preform is fixed in a cavity at the position of the working surface of the protective lining plate for casting, and medium-chromium alloy wear-resistant steel molten metal with the mass 9.5 times that of the ceramic preform is cast, wherein the medium-chromium alloy wear-resistant steel molten metal comprises the following components: 0.55%, Cr:4%, Mn: 1.2%, Si: 0.4%, Mo: 0.2 percent of Ni, less than or equal to 1.0 percent of Ni, less than or equal to 0.04 percent of P, less than or equal to 0.04 percent of S and the balance of iron, the molten metal reacts with the ceramic differential in the prefabricated body, the prefabricated body is cooled and demoulded to obtain a blank body, the blank body is subjected to heat treatment, and the heat treatment process comprises the following steps: heating to 1200 ℃ at the speed of 3 ℃/min, quenching, cooling to room temperature, and tempering at the temperature of 600 ℃ to obtain the protective lining plate.
The base metal of the blade of the spiral stirrer and the protective lining plate prepared by the embodiment has better toughness and can bear certain impact force, the boron nitride ceramic particles are uniformly distributed on the surface layer composite material, the wear resistance of the blade of the spiral stirrer and the protective lining plate is improved by 3.5 times compared with that of the conventional metal material, and the service life of the blade of the spiral stirrer and the protective lining plate is prolonged by 4 times.
Example 6
The utility model provides a novel wear-resisting tower mill, including transmission system, the tower body, the helical agitator, the protection welt, transmission system, the tower body is conventional structure, the protection welt includes side protection welt and bottom surface protection welt, the helical agitator sets up in the middle of the tower body, the side protection welt sets up in tower body inner wall side, the bottom surface protection welt sets up in tower body inner wall bottom surface, single face side protection welt is formed by ten right trapezoid concatenations, and be clearance fit between two right trapezoid, the circular protection welt in bottom surface is the ring by 8 the concatenation of the same fan ring, and be clearance fit between the fan ring, the protection welt is the combined material welt, the helical agitator blade is the combined material blade.
The preparation method of the spiral stirrer blade and the protective lining plate comprises the following steps:
TiO of 1200 mesh2、TiC、TiB2After CaO, WC and AlN are mixed according to the mass ratio of 1:1:1:1:1:1, absolute ethyl alcohol with the mass fraction of 9% of the mixed micro powder is added for ball milling for 4 hours to obtain mixed ceramic micro powder, the mixed ceramic micro powder is mixed with 120-mesh zirconium corundum ceramic particles, the mixed ceramic micro powder accounts for 5% of the mass of the zirconium corundum ceramic particles, after uniform mixing, polyvinyl alcohol with the mass fraction of 4% of the mass of the zirconium corundum ceramic particles is added as a binder, uniform slurry is obtained by uniform stirring, the slurry is filled into a honeycomb-shaped mold, a honeycomb-shaped prefabricated body is obtained by drying and demolding, the prefabricated body is placed into a box-type furnace, the temperature is increased to 560 ℃ at the heating rate of 7 ℃/min, the temperature is preserved for 3 hours, the furnace cooling is carried out, and the;
when the spiral stirrer blade is prepared, a plurality of prepared ceramic preforms are fixed on the position of the working surface of the spiral stirrer blade in a cavity for casting, the casting is non-pressure infiltration sand casting, the molding sand is sodium silicate sand, medium-chromium alloy wear-resistant steel molten metal with the mass 10 times that of the ceramic preforms is cast, and the medium-chromium alloy wear-resistant steel molten metal comprises the following components: 0.45%, Cr 6%, Mn: 0.5%, Si: 1.2%, Mo: 0.8 percent of Ni, less than or equal to 1.0 percent of Ni, less than or equal to 0.04 percent of P, less than or equal to 0.04 percent of S and the balance of iron, the molten metal reacts with the ceramic differential in the prefabricated body, the prefabricated body is cooled and demoulded to obtain a blank body, the blank body is subjected to heat treatment, and the heat treatment process comprises the following steps: heating to 1090 ℃ at the speed of 3 ℃/min, quenching, cooling to room temperature, and tempering at 550 ℃ to obtain a spiral stirrer blade;
when the protection lining plate is prepared, the prepared ceramic preform is fixed on the position of the working surface of the protection lining plate in the cavity for casting, the casting is pressureless infiltration sand casting, the molding sand is sodium silicate sand, medium-chromium alloy wear-resistant steel molten metal with the mass 10 times that of the ceramic preform is cast, and the medium-chromium alloy wear-resistant steel molten metal comprises the following components: 0.45%, Cr 6%, Mn: 0.5%, Si: 1.2%, Mo: 0.8 percent of Ni, less than or equal to 1.0 percent of Ni, less than or equal to 0.04 percent of P, less than or equal to 0.04 percent of S and the balance of iron, the molten metal reacts with the ceramic differential in the prefabricated body, the prefabricated body is cooled and demoulded to obtain a blank body, the blank body is subjected to heat treatment, and the heat treatment process comprises the following steps: heating to 1090 ℃ at the speed of 3 ℃/min, quenching, cooling to room temperature, and tempering at 550 ℃ to obtain the protective lining plate.
The base metal of the blade of the spiral stirrer and the protective lining plate prepared by the embodiment has better toughness and can bear certain impact force, the composite material on the surface layer is uniformly distributed with the zirconia-corundum ceramic particles, the wear resistance of the blade of the spiral stirrer and the protective lining plate is improved by 3 times compared with that of the conventional metal material, and the service life of the blade of the spiral stirrer and the protective lining plate is prolonged by 4 times.

Claims (6)

1. The utility model provides a novel wear-resisting tower mill, includes transmission system, tower body, helical agitator, protection welt, and the protection welt includes side protection welt and bottom surface protection welt, and the helical agitator sets up in the middle of the tower body, and the side protection welt sets up in tower body inner wall side, and the bottom surface protection welt sets up in tower body inner wall bottom surface, its characterized in that, the side protection welt is formed by the right trapezoid concatenation more than two, and is clearance fit between the right trapezoid, and the bottom surface protection welt is circular by the concatenation of the fan ring more than two, and is clearance fit between the fan ring, and the protection welt is the combined material welt, and the helical agitator includes the helical agitator blade, and the helical agitator blade is the combined material blade, the concrete step of the preparation method of helical agitator blade and protection welt:
uniformly mixing ceramic micro powder, adding absolute ethyl alcohol with the mass fraction of the ceramic micro powder being 6% -10%, ball-milling for 2-4 hours to obtain mixed ceramic micro powder, mixing the mixed ceramic micro powder with ceramic particles, adding a binder with the mass fraction of the ceramic particles being 4% -6%, uniformly stirring, filling into a honeycomb-shaped die, sintering, and demoulding to obtain a honeycomb-shaped ceramic preform;
when the spiral stirrer blade is prepared, fixing the prepared ceramic preform on the position of the working surface of the spiral stirrer blade in the cavity, casting metal liquid with the mass 8-10 times that of the ceramic preform, demoulding after cooling, and performing heat treatment to obtain the spiral stirrer blade;
when the protective lining plate is prepared, fixing the prepared ceramic preform on the position of the working surface of the protective lining plate in the cavity, casting metal liquid with the mass 8-10 times that of the ceramic preform, cooling, demoulding and carrying out heat treatment to obtain the protective lining plate;
the metal of the molten metal is high manganese steel or medium chromium alloy wear-resistant steel;
the heat treatment process comprises the following steps: the heat treatment process when the molten metal is high manganese steel molten metal comprises the following steps: heating to 650-750 ℃ at a speed of 3 ℃/min, preserving heat for 1.5-2.5h, heating to 1100-1200 ℃ at a speed of 2 ℃/min, preserving heat for 2-3h, and then water quenching until the temperature is cooled to room temperature; the heat treatment process when the molten metal is medium chromium alloy wear-resistant steel molten metal comprises the following steps: heating to 980-1200 ℃ at the speed of 3 ℃/min, quenching until the temperature is cooled to the room temperature, and then tempering at the temperature of 500-600 ℃.
2. The new attrition resistant tower mill as claimed in claim 1, wherein the ceramic micropowder is TiO2、TiC、TiB2、Si3N4、BN、TiN、Al2O3、ZrO24 or more than 4 of CaO, WC and AlN, and the granularity of each ceramic micro powder is 1200-1500 meshes.
3. The new attrition resistant tower mill of claim 1 wherein the ceramic particles are alumina, zirconia alumina, silicon carbide, tungsten carbide or boron nitride particles having a particle size of 30-150 mesh.
4. The novel attrition resistant tower mill of claim 1 wherein the binder is water glass, silica sol, aluminum dihydrogen phosphate, polyvinyl alcohol, or polyvinyl butyral.
5. The novel wear resistant tower mill of claim 1, wherein the sintering process is: heating to 530 ℃ and 570 ℃ at the heating rate of 5-7 ℃/min, preserving the heat for 2-4 hours, and then cooling along with the furnace.
6. A novel abrasion resistant tower mill according to claim 1, wherein said casting is pressureless sand casting and said sand is water glass sand.
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