CN101780430B - Method for preparing high-strength porcelain insulator blank by agitating type sanding - Google Patents
Method for preparing high-strength porcelain insulator blank by agitating type sanding Download PDFInfo
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- CN101780430B CN101780430B CN2010101146892A CN201010114689A CN101780430B CN 101780430 B CN101780430 B CN 101780430B CN 2010101146892 A CN2010101146892 A CN 2010101146892A CN 201010114689 A CN201010114689 A CN 201010114689A CN 101780430 B CN101780430 B CN 101780430B
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Abstract
The invention relates to a method for preparing high-strength porcelain insulator blank by agitating type sanding, belonging to a continuous grinding process, and comprising the steps of high efficiency quick grinding by agitating type sanding, hydrocyclone separation and regrinding of coarse particles. In the invention, according to the requirements for hardness and fineness of raw materials, high efficiency quick grinding is carried out by agitating type sanding, thereby greatly improving the grinding efficiency, shortening the grinding time, reducing the scope of particle size distribution, and reducing the energy consumption of grinding. The hydrocyclone separation technology is adopted, particles achieving the fineness requirement are separated in time, and coarse particles which do not achieve the fineness requirement are returned to be reground, thereby preventing the raw materials from being overground, and eliminating the harmful coarse particles. The invention is suitable for grinding a single raw material and mixture of a plurality of raw materials, can effectively reduce the preparation cost of the high-strength porcelain insulator blank, and improves the mechanical strength, electrical insulation strength and operation reliability in a high-voltage fence of porcelain insulator products.
Description
Technical field
The present invention relates to material preparation technology, further be meant to prepare high-strength porcelain insulator blank, be fit to preparation various high-strength suspension porcelain insulators, bar-shaped porcelain insulator and hollow porcelain insulator etc. with agitating type sanding.
Background technology
High-strength porcelain insulator is the key components of high voltage power transmission and transforming circuit and equipment, and the effect of edge and support fixation of drawing last breath mainly electrifies.Along with the development of China's super-pressure and extra-high voltage electric transmission and transformation engineering, more and more higher to the requirement of the mechanical strength of porcelain insulating material and reliability.In order to improve the mechanical strength of porcelain insulator, introducing high-intensity corundum in granules with the form of bauxite strengthens the porcelain insulating material usually.At present the method for domestic production high-strength porcelain insulator blank is, natural minerals such as bauxite, kaolin and feldspar are mixed in ball mill after by the prescription weighing and is ground to required fineness.Yet it is more many than raw material difficulties such as traditional feldspar and clays that the corundum in granules of high strength and high hardness is ground to required fineness.Therefore, when the preparation high-strength porcelain insulator, the general ball-milling technology that feeds in raw material at twice that adopts after promptly elder generation is ground to certain fineness with hard raw materials such as alumina, feldspars, adds the easily raw clay of mill again.Though this technology helps the refinement of alumina, feldspar particle, grinding efficiency is low, needed ball milling usually 15 hours-20 hours, and particle distribution range is wide.Ball milling increases the abrasion of abrasive body for a long time, and when particularly being abrasive body with siliceous ballstones such as flint or extra large cobbles, the wearing and tearing of ballstone account for the 1%-3% of grinding charge material in the mechanical milling process, promptly cause the SiO in the blank
2Content has improved 1%-3%, and this mechanical strength and reliability to high-strength porcelain insulator is very disadvantageous.
Although high-efficient grinding equipment that some are novel and technology obtain to use in the powder technology technology, for example, airflow milling can prepare average grain diameter at the powder below 3 microns by the high velocity impact of storeroom self, and the pollution to material in the process of lapping is very little, but equipment investment is bigger, running noises is big, and dedusting requires high.Vibratory milling has been quickened collision frequency between material and the ballstone by dither, thereby grinding efficiency is 10 times of roller milling even higher, but exist equally the equipment running noises big, because of vibrating the problems such as fatigue damage that easily cause parts.All mainly by the collision fragmentation of storeroom, the resulting granules corner angle are many for above-mentioned two kinds of Ginding process, and are mobile poor, and all only are fit to the dry grinding of single material, to many components and have different hardness and the grinding of the porcelain insulator raw material of density also improper.
Summary of the invention
The technical problem to be solved in the present invention is, deficiencies such as the grinding efficiency that exists at traditional ball grinding method is low, particle distribution range is wide, a kind of method for preparing high-strength porcelain insulator blank with agitating type sanding is proposed, it is under the prerequisite of guaranteeing porcelain insulator blank processing performance, can improve grinding efficiency to greatest extent, and the distribution of dwindling particle, the grain shape of gained powder is subsphaeroidal, good fluidity helps improving the microstructure of porcelain insulator product; By improving the uniformity of porcelain insulator blank, reach the purpose that improves porcelain insulator product mechanical strength, electric insulation intensity and operational reliability; Also can promote the energy-saving and cost-reducing and cleaner production in the porcelain insulator preparation process, effectively reduce the manufacturing cost of high-strength porcelain insulator product.
Technical scheme of the present invention is, the described method for preparing high-strength porcelain insulator blank with agitating type sanding has following steps:
(1) hard bauxite raw material, feldspar are ground to the following fineness of 100 μ m with Raymond mill or other existing disintegrating apparatus earlier, are mixed with flowability and the suspension good slurry of water content then at 40%-60%;
If raw material has reached fineness requirement, then directly prepare slurry;
(2) bottom that described slurry is sent into the agitating type sanding machine continuously with pneumatic diaphragm pump enters the mouth; Wall liner corundum ceramic or polyurethane in the sand mill mill chamber, the agitator appearance coats with polyurethane, fills middle aluminium corundum porcelain sand or the high alumina corundum porcelain sand of φ 2.5mm-3.5mm in the mill chamber, when treating that sand mill mill chamber body is expired in the slurry filling, starts agitator;
(3) slurry produces high efficiency abrasive action with corundum porcelain sand under agitator drives with 500 rev/mins-1000 rev/mins run up, simultaneously, what enter the mouth in the bottom makes slurry progressively upwards flow for starching under the pressure effect, finish a milling cycle during outlet of arrival top; The time of finishing a milling cycle is different with desired fineness according to material hardness, regulates in 3 minutes-30 minutes;
(4) send into hydrocyclone under the pressure effect of slurry after grinding at 0.3MPa-0.8MPa, the particle separation that reaches fineness requirement is gone out, the a small amount of coarse granule that does not reach fineness requirement as yet then is returned to agitating type sanding machine inlet and carries out the grinding of second period, until reaching fineness requirement.
Below the present invention made further specify.
Other existing disintegrating apparatus described in the step of the present invention (1) can be ball mill, air-flow grinding machine or vibrating mill etc.; Be ground to the following fineness of 100 μ m and be meant that raw material can all be the analysis sieve of 100 μ m by the aperture.
The original depth of wall liner corundum ceramic or polyurethane should be not less than 10mm in the sand mill mill chamber described in the step of the present invention (2), should in time change when wearing up to thickness less than 5mm.
Aluminium corundum porcelain sand can be that alumina content is not less than 60% abrasion-resistant corundum matter porcelain ball in described in the step of the present invention (2), and high alumina corundum porcelain sand can be that alumina content is not less than 90% abrasion-resistant corundum matter porcelain ball.
Regulating a milling cycle time method described in the step of the present invention (3) can be to regulate grout absorption and advance to starch pressure by the operating frequency of regulating pneumatic diaphragm pump, thus the control time of staying of slurry in the sand mill cavity.
Separate the particle that reaches fineness requirement with hydrocyclone described in the step of the present invention (4), be meant the particle of particle diameter less than 20 μ m.Viscosity according to the real density of raw material and slurry is different, enters the particle that method that hydrocyclone advances to starch pressure is separated different-grain diameter by adjusting.
The present invention prepares high-strength porcelain insulator blank with agitating type sanding, can effectively overcome the deficiency with airflow milling and vibromill, and the efficient wet that is fit to high-strength porcelain insulator blank grinds, and can significantly remove the above coarse granule of 20 μ m.
Technical contribution of the present invention is, in the process of lapping of high-strength porcelain insulator blank, can carry out respectively efficiently grinding fast to different material according to raw material hardness and fineness requirement, and the particle that will reach fineness requirement in time separates with hydrocyclone.Like this, avoided increasing the consumption of energy consumption and equipment on the one hand because of overgrinding, on the other hand, to there be the coarse granule greater than 20 μ m of adverse effect to separate to the porcelain insulator material property, the granularity of each raw material is controlled at comparatively ideal distribution in the blank thereby make, when shortening milling time, reducing the grinding energy consumption, improved the mechanical strength and the electric insulation intensity of high-strength porcelain insulator product, guaranteed product reliability of operation in high-voltage fence.
The present invention compares with traditional ball-milling technology, at first is significantly to improve grinding efficiency, shortens milling time, grinds energy consumption thereby significantly reduce.Secondly, the abrasive body diameter that the present invention adopts is φ 3 ± 0.5mm, is that the abrasive body of 30mm-60mm is little 10 times-20 times than diameter in the ball mill, material can be ground to more tiny size fast, and particle size distribution range is narrow.The 3rd, adopt technology of Hydrocyclone Scperation, the particle that will reach fineness requirement in time separates, and the coarse granule greater than 20 μ m then returns the continuation grinding on a small quantity, has both avoided raw material by overgrinding, has realized again harmful coarse grained rejecting.The 4th, the agitating type sanding technology that the present invention adopts is that a kind of continous way is ground new technology, can adapt to the grinding of single raw material and plurality of raw materials mixture, to the adjusting of blank fineness with control convenient, flexible.
As known from the above, the present invention is a kind of method for preparing high-strength porcelain insulator blank with agitating type sanding, this method can significantly improve grinding efficiency, shorten milling time, the grain shape of gained powder is subsphaeroidal, good fluidity has dwindled the particle size distribution range of blank, helps improving the microstructure of porcelain insulator product; Also reduce the process of lapping energy consumption significantly, thereby effectively reduce the high-strength porcelain insulator production cost of products, improve mechanical strength, electric insulation intensity and the reliability of operation in high-voltage fence of porcelain insulator product.
The specific embodiment
Embodiment 1: the described method for preparing the high-strength suspension porcelain insulator blank with agitating type sanding is:
(1) bauxite, the feldspar of fineness below 100 μ m is mixed with flowability and the suspension good slurry of water content about 50%.
(2) bottom that this slurry is sent into the agitating type sanding machine continuously with pneumatic diaphragm pump enters the mouth; Wall liner corundum ceramic piece in the sand mill mill chamber, the agitator appearance coats with polyurethane, fills the middle aluminium corundum porcelain sand of φ 3 ± 0.5mm in the mill chamber; When treating that the sand mill cavity is expired in the slurry filling, start agitator;
The agitating type sanding machine can adopt prior art products.
(3) with frequency converter with the rotational speed regulation to 800 of agitator rev/mins-1000 rev/mins, make slurry and corundum porcelain sand produce relative motion and realize high efficiency grinding; Slurry enters the mouth when progressively flowing to the exit, top from the sand mill bottom in process of lapping, promptly finishes a milling cycle.Regulate the milling time of material in sand mill by the pressure that advances to starch of regulating pneumatic diaphragm pump,, generally in 15 minutes～30 minutes, regulate according to the initial fineness difference of raw material.
(4) slurry after grinding is sent into hydrocyclone under the effect of 0.3MPa-0.6MPa pressure, separates the particle that reaches fineness requirement.The a small amount of coarse granule greater than 20 microns that does not reach fineness requirement as yet then is returned to agitating type sanding machine inlet and carries out the grinding of second period, until reaching fineness requirement.
Hydrocyclone can adopt prior art products.
Embodiment 2: the described method for preparing high strength bar-shaped porcelain insulator blank with agitating type sanding is:
(1) the hard raw material of bauxite, feldspar is pulverized the following fineness of 320 orders (about 50 μ m) with Raymond mill respectively, various raw materials in the prescription are mixed with flowability and the good slurry of suspension that water content is 40%-50%;
(2) bottom that this slurry is sent into the agitating type sanding machine continuously with pneumatic diaphragm pump enters the mouth; Sand mill mill chamber liner corundum ceramic piece, the agitator appearance coats with polyurethane, fills the high alumina corundum porcelain sand of φ 3 ± 0.5mm in the mill chamber; When treating that the sand mill cavity is expired in the slurry filling, start agitator;
(3) rotating speed of adjusting agitator reaches 500 rev/mins-800 rev/mins, makes the generation relative motion of slurry and corundum porcelain sand and realizes high efficiency grinding; Slurry enters the mouth when progressively flowing to the top outlet from the sand mill bottom in process of lapping, promptly finishes a milling cycle; Regulate the milling time of material in sand mill by the pressure that advances to starch of regulating pneumatic diaphragm pump, generally regulated in the scope at 5 minutes-15 minutes;
(4) slurry after grinding is sent into hydrocyclone under the effect of 0.5MPa-0.8MPa pressure, separates the particle that reaches fineness requirement.The a small amount of coarse granule greater than 20 microns that does not reach fineness requirement as yet then is returned to agitating type sanding machine inlet and carries out the grinding of second period, until reaching fineness requirement.
Embodiment 3: the described method for preparing the hollow porcelain insulator blank of high strength with agitating type sanding is:
(1) the hard raw material of bauxite, feldspar etc. is pulverized the following fineness of 250 orders (about 60 μ m) with Raymond mill respectively, various raw materials in the prescription are mixed with flowability and the good slurry of suspension that water content is 40%-50%;
(2) bottom that this slurry is sent into the agitating type sanding machine continuously with pneumatic diaphragm pump enters the mouth.The above polyurethane of wall liner 10mm in the sand mill mill chamber, the agitator appearance coats with polyurethane, fills the middle aluminium corundum porcelain sand of φ 3 ± 0.5mm in the mill chamber; When treating that the sand mill cavity is expired in the slurry filling, start agitator;
(3) rotating speed of adjusting agitator is 600 rev/mins-800 rev/mins, makes the generation relative motion of slurry and corundum porcelain sand and realizes high efficiency grinding; Slurry enters the mouth when progressively flowing to the exit, top from the sand mill bottom in process of lapping, promptly finishes a milling cycle; Regulate the milling time of material in sand mill by the pressure that advances to starch of regulating pneumatic diaphragm pump, generally be controlled in 10 minutes-30 minutes scopes:
(4) slurry after grinding is sent into hydrocyclone under the effect of 0.4MPa-0.6MPa pressure, separates the particle that reaches fineness requirement; The a small amount of coarse granule greater than 20 μ m that does not reach fineness requirement as yet then is returned to agitating type sanding machine inlet and carries out the grinding of second period, until reaching fineness requirement.
Claims (5)
1. one kind prepares the method for high-strength porcelain insulator blank with agitating type sanding, and its processing step is:
(1) hard bauxite raw material, feldspar are ground to the following fineness of 100 μ m with Raymond mill or other existing disintegrating apparatus earlier, are mixed with flowability and the suspension good slurry of water content then at 40%-60%; Described other existing disintegrating apparatus are ball mill, air-flow grinding machine or vibrating mill;
(2) bottom that described slurry is sent into the agitating type sanding machine continuously with pneumatic diaphragm pump enters the mouth; Wall liner corundum ceramic or polyurethane in the sand mill mill chamber, the agitator appearance coats with polyurethane, fills middle aluminium corundum porcelain sand or the high alumina corundum porcelain sand of φ 2.5mm-3.5mm in the mill chamber, when treating that sand mill mill chamber body is expired in the slurry filling, starts agitator;
(3) slurry produces high efficiency abrasive action with corundum porcelain sand under agitator drives with 500 rev/mins-1000 rev/mins run up, simultaneously, what enter the mouth in the bottom makes slurry progressively upwards flow for starching under the pressure effect, finish a milling cycle during outlet of arrival top; The time of finishing a milling cycle is different with desired fineness according to material hardness, regulates in 3 minutes-30 minutes;
(4) send into hydrocyclone under the pressure effect of slurry after grinding at 0.3MPa-0.8MPa, the particle separation that reaches fineness requirement is gone out, the a small amount of coarse granule that does not reach fineness requirement as yet then is returned to agitating type sanding machine inlet and carries out the grinding of second period, until reaching fineness requirement.
2. prepare the method for high-strength porcelain insulator blank according to claim 1 is described with agitating type sanding, it is characterized in that the original depth of wall liner corundum ceramic or polyurethane is not less than 10mm in the sand mill mill chamber described in the step (2).
3. according to the described method for preparing high-strength porcelain insulator blank with agitating type sanding of claim 1, it is characterized in that, aluminium corundum porcelain sand is that alumina content is not less than 60% abrasion-resistant corundum matter porcelain ball in described in the step (2), and high alumina corundum porcelain sand is that alumina content is not less than 90% abrasion-resistant corundum matter porcelain ball.
4. according to the described method for preparing high-strength porcelain insulator blank with agitating type sanding of claim 1, it is characterized in that, regulating a milling cycle time method described in the step (3) is to regulate grout absorption and advance to starch pressure by the operating frequency of regulating pneumatic diaphragm pump, thus the control time of staying of slurry in the sand mill cavity.
5. prepare the method for high-strength porcelain insulator blank according to claim 1 is described with agitating type sanding, it is characterized in that, separate the particle that reaches fineness requirement with hydrocyclone described in the step (4), be meant the particle of particle diameter less than 20 μ m.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102872958A (en) * | 2012-09-26 | 2013-01-16 | 佛山市博晖机电有限公司 | Grinding process of ceramic raw material and ceramic raw material grinding production line |
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| CH712233A2 (en) * | 2016-03-15 | 2017-09-15 | Arcolor Ag | Process for the preparation of dispersions with a defined particle size. |
| CN111450944A (en) * | 2020-03-31 | 2020-07-28 | 佛山市恒益环保建材有限公司 | Grinding process of autoclaved aerated concrete slurry |
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| US6499680B2 (en) * | 2001-06-01 | 2002-12-31 | Saint-Gobain Ceramics And Plastics, Inc. | Grinding media |
| CN2721227Y (en) * | 2004-07-01 | 2005-08-31 | 冯余 | High-purity sand polisher |
| CN201002044Y (en) * | 2006-12-29 | 2008-01-09 | 徐文祥 | Rust-cleaning device for stone flour grinding machine |
| CN101301633A (en) * | 2008-07-04 | 2008-11-12 | 吕忠广 | Ore beater grinder with circulated wind and adjustable fineness |
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| CN102872958A (en) * | 2012-09-26 | 2013-01-16 | 佛山市博晖机电有限公司 | Grinding process of ceramic raw material and ceramic raw material grinding production line |
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Assignee: Hunan T-Center Technology Co., Ltd. Assignor: Hunan University Contract record no.: 2012430000021 Denomination of invention: Method for preparing high-strength porcelain insulator blank by agitating type sanding Granted publication date: 20110622 License type: Exclusive License Open date: 20100721 Record date: 20120326 |
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