CN101658810B - Method for preventing wear of end cover of ball mill - Google Patents
Method for preventing wear of end cover of ball mill Download PDFInfo
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- CN101658810B CN101658810B CN 200910075511 CN200910075511A CN101658810B CN 101658810 B CN101658810 B CN 101658810B CN 200910075511 CN200910075511 CN 200910075511 CN 200910075511 A CN200910075511 A CN 200910075511A CN 101658810 B CN101658810 B CN 101658810B
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- ball mill
- welding
- wear
- end cover
- hollow end
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Abstract
A method for preventing wear of an end cover of a ball mill aims at prolonging the service life of the end cover of the ball mill; the method is characterized in that the hollow end cover of the ball mill is connected with a bush inside by welding and sealing; a magnet is filled in a welding seam, and the magnet is adhered to the bush by magnetic force, and when mineral pulp enters an inner cavity channel of the ball mill, mineral powder is adsorbed by the magnet to prevent the welding seam from being washed and worn by the mineral powder; high-strength anti-wear material is filled into a cavity of the hollow end cover by a high-pressure slag pulp pump to prevent the end cover from being washed and worn by the mineral pulp; and the cavity of the hollow end cover of the ball mill is provided with anti-wear plates at intervals which divide the mineral pulp into a plurality of sections and ensure the mineral pulp not to do relative rotating circular motion along the inner surface of the hollow end cover and the outer surface of the bush, thus reducing the washing and wear of the hollow end cover by the mineral pulp.
Description
Technical field
The present invention relates to a kind of wear of end cover of ball mill method that prevents.
Background technology
Ball mill is the capital equipment that Iron Ore Powder is produced, ball mill with bulk granularity iron ore roughly grind, middle mill and fine grinding, make the Iron Ore Powder granularity reach customer requirements.But in use; Ore pulp in the ball mill barrel is prone to get into the inner chamber of hollow end cap of ball mill and charging and discharging lining; Cause ore pulp wearing and tearing hollow end cover cavity; The major accident that ball mill barrel throws away, hollow end cap fractures cause end cover of ball mill and lining to be scrapped in early days, if will appear in untimely inspection and replacing; If the hollow end cap of ore pulp concentrated wear causes ore pulp to get into big watt of ball mill, will cause ball mill oil return pipe plug, even cause big watt of scaling loss of ball mill.Simultaneously, after ore pulp gets into hollow end cap, throw away from the hollow macro-axis of end cap, the ore pulp that throws away not only influences environmental sanitation, and gets into big pinion easily, constitutes dangerously to travelling gear is lubricated, causes the gear premature wear and loses efficacy.
Summary of the invention
The present invention seeks to overcoming the deficiency of above-mentioned prior art, a kind of end cover of ball mill wear of end cover of ball mill method that prevents in service life that improves is provided.
Ball mill mainly comprises feeder, barrel, discharging portion.Feeder and discharging portion are equipped with hollow end cap of charging and the hollow end cap of discharging respectively; Be referred to as hollow end cap; For reducing Iron Ore Powder washing away and wearing and tearing to end cover of ball mill; Cover in ball mill charging or discharging hollow end charging center bush and discharging center bush are installed respectively, charging and discharging center bush are referred to as lining.
The inventive method is:
(1) bind mode of hollow end cap of ball mill and bush inside adopts welded seal, improves the long periodicity and the reliability of sealing; Connecting mode in the past is the felt sealing;
(2) fill magnetic patch in welded joints, magnetic patch is adsorbed on the lining by magnetic force, and when ore pulp got into the ball mill bore passages, breeze was protected weld seam not receive washing away and wearing and tearing of breeze by magnetic patch absorption.Magnetic patch is the rectangle permanent magnet, is of a size of 40 * 40 * 120mm, the magnetic field intensity B=1700 Gauss of magnetic patch;
(3) utilize high pressure slag stock pump that high-strength wear-resistant material is fills up in the cavity of hollow end cap, the protection end cap is not washed away and wearing and tearing by ore pulp; High-strength wear-resistant material is epoxy resin or slag cement slurry, and meeting water can expand;
(4) wear strip is set at interval in the hollow end cap cavity of ball mill; Ore pulp is separated into plurality of sections; Make its outer surface that can not paste hollow end interior surface and lining do the motion of relative rotation round, alleviated ore pulp, thereby prolong the service life of hollow end cap the washing away and wearing and tearing of hollow end cap.Wear strip is of a size of 750 * 30mm, and the about 10mm of thickness is spaced apart 15 °, has 24.
For prevent that hollow end cap of ball mill and lining from causing crackle, be mingled with in welding process, pore etc., at first should J506, J422 welding rod be placed on and be heated to 300 ℃ in the electric furnace, be incubated 2 hours.Then hollow end cap and charging and discharging lining weld are cleaned up with gasoline; Make a call to 30 degree grooves at hollow end cap inner face and lining outer face with acetylene or angle hand grinding tool, guarantee the weld seam through welding; Be soldered the surface to 300 ℃ with the acetylene burner preheating, avoid in welding process stress to concentrate and destroy parent part.Earlier with J506 welding rod prime coat, throat thickness is 7～9 millimeters, uses J422 welding rod built-up welding groove then during welding, adopts multiple-bead deposit, balanced welding, and stress is concentrated and distortion to reduce.Back one deck welding current should be more bigger than preceding one deck welding current, can melt away scarce limits such as last layer weld seam, slag inclusion; Welding rod is vertical with groove, and built-up welding top layer electric current is smaller, and the arc manipulation welding is wanted evenly to make weld seam mechanical and physical performance uniformity.This member is continuous welding, and weld bead height is greater than 45 millimeters.Be to guarantee weld strength and eliminate welding stress, weld seam is with the welding hammering, 15～20 millimeters of hammer points apart from the weld pool solidifies edge, and hammer force 600～700 newton, hammering frequency are 3 hertz.Painted (the PT)+ultrasonic examination of postwelding weld seam, weldquality reach the requirement of GB1134-89B class II level.To weld at last about local warming to 300 ℃, be incubated slowly cooling after a hour, carry out temper, eliminate internal stress.
The present invention is suitable for the transformation to existing end cover of ball mill.Can prevent effectively that the ball mill coupling bolt is loosening, guarantee that end cover of ball mill is not washed away and wearing and tearing, in the service life of improving end cover of ball mill, improves its hermetically-sealed construction and physical property.Can prevent that ore pulp from be prone to getting in the hollow end cap cavity of ball mill, flow and rotatablely move and rupture after causing wear of end cover of ball mill because of continuing exchange; Use welding protection, magnetic patch filling, the filling of wear-resistant material and wearing strip setting cleverly, solved the hollow end cap seal problem of difficult of ball mill, have good wear resistance and sealing.Can reach 160,000 hours service life～200,000 hours, or can use continuously 20～25 years, be more than two times of common end cap service life.Effectively reduce the grinding machine downtime, improved the ball mill operating rate.
The specific embodiment
When ball mill input and output material lining is installed; Earlier with the attachment bolt of hollow end cap and charging and discharging lining fastening after; Again the inner face of charging and discharging lining the inner with hollow end cap is welded, change the charging and discharging lining and bring difficulty, guaranteed the reliability of hollow end cap though give like this.Hollow end cap and lining belong to medium carbon steel and Nodular Iron Welding class, and solderability is poor; As: the material of Φ 3200 * 4500 end cover of ball mill is cast steel ZG35, weight 9200Kg, appearance and size is Φ 3600/ Φ 1200 * 1820; The material of lining is spheroidal graphite cast-iron QT45-5, weight 2700Kg, and appearance and size is Φ 1000/ Φ 700 * 1685.Therefore in the welding process, prevent the generation of scarce limits such as weld crack, pore and slag inclusion, in case take place and in time to take measures to eliminate.
In the cavity of ball mill charging and discharging portion, magnetic field intensity B=1700 Gauss's 40 * 40 * 120 rectangle permanent magnets is installed, promptly 24 magnetic patch are installed in the charging and discharging sleeve outer surface, lean on the magnetic patch suction adsorption on the charging and discharging lining.When the ore pulp in the ball mill barrel got into hollow end cap, the Iron Ore Powder in the ore pulp just can be adsorbed by magnetic patch, produced magnetic coagulation and more and more big, was full of the cavity of whole hollow end cap, formed cavity between hollow end cap and the lining by the breeze sealed solid.High-strength wear-resistant material adopts water-swellable and the material of high-strength wear-resistant character is arranged, like happy safe glue, epoxy resin, and slag cement slurry etc.
In hollow end cap cavity, set up wear strip along circumference, be of a size of 750 * 30 millimeters, thickness is 10 millimeters, whenever at a distance from one of 15 ° of welding, totally 24 blocks of wear strips.When in case ore pulp gets in the cavity; These wear strips will be separated into plurality of sections to ore pulp; Make its outer surface that can not paste hollow end interior surface and charging and discharging lining make relative circular motion; Alleviated the wearing and tearing of ore pulp, thereby prolonged the service life of hollow end cap the outer surface of the inner surface of hollow end cap and charging and discharging linings.
Processing three road O shape cannelures are bumped in the groove with O shape rubber seal on the charging and discharging lining, and after charging and discharging lining and the assembling of hollow end cap, both fit clearances just are closed by three road O shape rubber seal.The charging and discharging liner size is Φ 970-0.35; Length * diameter=960 * 10 of O shape rubber seal, GB3452.1-90; In O shape rubber seal outside, three roads, use welded seal again, welding and assembling height is greater than 45 * 45 millimeters; Fill simultaneously 40 * 40 * 120 rectangle permanent magnets that magnetic field intensity is B=1700 Gauss in welded joints, when ore pulp got into the ball mill bore passages, breeze was protected weld seam not receive washing away and wearing and tearing of breeze by magnetic patch absorption.Improved like this charging and discharging lining has the characteristics of triple seal, and promptly R5 O-ring cambered surface, three road O shape rubber seal and welded seal combine.
Claims (5)
1. one kind prevents the wear of end cover of ball mill method, it is characterized in that:
(1) bind mode of hollow end cap of ball mill and bush inside adopts welded seal;
(2) fill magnetic patch in welded joints, magnetic patch is adsorbed on the lining by magnetic force, and when ore pulp got into the ball mill bore passages, breeze was protected weld seam not receive washing away and wearing and tearing of breeze by magnetic patch absorption;
(3) utilize high pressure slag stock pump that high-strength wear-resistant material is fills up in the cavity of hollow end cap, the protection end cap is not washed away and wearing and tearing by ore pulp;
(4) in the hollow end cap cavity of ball mill, at interval wear strip is set, ore pulp is separated into plurality of sections, make its outer surface that can not paste hollow end interior surface and lining do relative rotation round motion, alleviate ore pulp washing away and wearing and tearing hollow end cap.
2. the wear of end cover of ball mill method that prevents as claimed in claim 1 is characterized in that magnetic patch is the rectangle permanent magnet, is of a size of 40 * 40 * 120mm, the magnetic field intensity B=1700 Gauss of magnetic patch.
3. the wear of end cover of ball mill method that prevents as claimed in claim 1 is characterized in that high-strength wear-resistant material is epoxy resin or slag cement slurry.
4. the wear of end cover of ball mill method that prevents as claimed in claim 1 is characterized in that wear strip is of a size of 750 * 30mm, and the about 10mm of thickness is spaced apart 15 °, has 24.
5. the wear of end cover of ball mill method that prevents as claimed in claim 1 is characterized in that hollow end cap of ball mill and lining adopt welded seal; At first should J506, J422 welding rod be placed on and be heated to 300 ℃ in the electric furnace, be incubated 2 hours; Then hollow end cap and charging and discharging lining weld are cleaned up with gasoline; Make a call to 30 degree grooves at hollow end cap inner face and lining outer face with acetylene or angle hand grinding tool, guarantee the weld seam through welding; Be soldered the surface to 300 ℃ with the acetylene burner preheating, avoid in welding process stress to concentrate and destroy parent part; Earlier with J506 welding rod prime coat, throat thickness is 7～9 millimeters, uses J422 welding rod built-up welding groove then during welding, adopts multiple-bead deposit, balanced welding, and stress is concentrated and distortion to reduce; Back one deck welding current should be more bigger than preceding one deck welding current, can melt away scarce limits such as last layer weld seam, slag inclusion; Welding rod is vertical with groove, and built-up welding top layer electric current is smaller, and the arc manipulation welding is wanted evenly to make weld seam mechanical and physical performance uniformity; Be to guarantee weld strength and eliminate welding stress, weld seam is with the welding hammering, 15～20 millimeters of hammer points apart from the weld pool solidifies edge, and hammer force 600～700 newton, hammering frequency are 3 hertz; To weld at last about local warming to 300 ℃, be incubated slowly cooling after a hour, carry out temper, eliminate internal stress.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910075511 CN101658810B (en) | 2009-09-19 | 2009-09-19 | Method for preventing wear of end cover of ball mill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910075511 CN101658810B (en) | 2009-09-19 | 2009-09-19 | Method for preventing wear of end cover of ball mill |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101658810A CN101658810A (en) | 2010-03-03 |
| CN101658810B true CN101658810B (en) | 2012-01-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200910075511 Expired - Fee Related CN101658810B (en) | 2009-09-19 | 2009-09-19 | Method for preventing wear of end cover of ball mill |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102658225A (en) * | 2012-04-25 | 2012-09-12 | 白银有色集团股份有限公司 | Method for repairing ball mill |
| CN109894718A (en) * | 2017-12-08 | 2019-06-18 | 中国石油天然气股份有限公司 | Repair method of water injection pipeline |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1724169A (en) * | 2005-07-08 | 2006-01-25 | 太原钢铁(集团)有限公司 | Protective unit for hollow axle of mill end cap and end cap of grate type mill thereof |
| CN2936425Y (en) * | 2006-08-25 | 2007-08-22 | 江西铜业集团公司德铜分公司 | Ball mill end lid |
| CN101234359A (en) * | 2007-01-31 | 2008-08-06 | 江西铜业集团公司 | Backfill method for end cap cavity and material inlet and outlet of ball mill |
-
2009
- 2009-09-19 CN CN 200910075511 patent/CN101658810B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1724169A (en) * | 2005-07-08 | 2006-01-25 | 太原钢铁(集团)有限公司 | Protective unit for hollow axle of mill end cap and end cap of grate type mill thereof |
| CN2936425Y (en) * | 2006-08-25 | 2007-08-22 | 江西铜业集团公司德铜分公司 | Ball mill end lid |
| CN101234359A (en) * | 2007-01-31 | 2008-08-06 | 江西铜业集团公司 | Backfill method for end cap cavity and material inlet and outlet of ball mill |
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| Publication number | Publication date |
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| CN101658810A (en) | 2010-03-03 |
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