CN103542725B - Method for prolonging service life of guide chute of sintering machine - Google Patents
Method for prolonging service life of guide chute of sintering machine Download PDFInfo
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- CN103542725B CN103542725B CN201310476382.0A CN201310476382A CN103542725B CN 103542725 B CN103542725 B CN 103542725B CN 201310476382 A CN201310476382 A CN 201310476382A CN 103542725 B CN103542725 B CN 103542725B
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Abstract
The invention discloses a method for prolonging the service life of a guide chute of a sintering machine, and belongs to the field of technologies for sintering metallurgical iron ore powder. The method includes welding an anchoring part on a chute bottom plate of the guide chute of the sintering machine; laying prefabricated bricks on an extending end surface of a discharge end of the chute bottom plate of the guide chute of the sintering machine; performing dry mixing on castables in a stirrer, adding water into the castables, stirring the water and the castables, conveying the castables to an area, which is located within the range of the prefabricated bricks, of the chute bottom plate, casting the castables and fastening the castables by the anchoring part. The method has the advantages that a body, which bears impact of sinter cakes, of the guide chute is made of the high-strength refractory castables instead of metal, and accordingly the impact resistance, the abrasion resistance and the corrosion resistance of the guide chute at a high temperature can be greatly improved.
Description
Technical field
The invention belongs to metallurgy iron sintering mineral powder technical field, particularly a kind of method improving the gathering sill of sintering device life-span.
Background technology
The operation principle of sintering machine is that iron-bearing material is equipped with flux, fuel etc. through mixing granulation formation compound, by distribution device on sintering machine compound cloth on the chassis of sintering machine, light a fire through ignition furnace, under exhausting condition, compound sinters from top to bottom, and when sintering pallet runs to the afterbody of sintering machine, compound becomes thermal sintering cake, the temperature of material layer lower part sintering deposit cake is mostly between 700-900 DEG C, and part red beds temperature even can reach 1100 DEG C.
Gathering sill of sintering device is between the afterbody and the feeder of single roll crusher of sintering machine, it is the visual plant on whole sintering process production line, to fall from eminence with the sintering deposit cake of red piece and pound deflector chute and cushion, what then thermal sintering cake was fed to that single roll crusher is rotating carries out fragmentation between roller tooth and grate plate, is finally supplied to the cooling that central cooler carries out sintering deposit.The effect of tail gathering sill of sintering machine is used to the powerful impact produced when the sinter cake absorbed on chassis falls.For preventing sinter cake from directly impacting single roller and the destruction that produces single roller, deflector chute is generally designed to inclined-plane, and requires certain length, after the material on sintering pallet gets off, by expecting that the mode of material extrusion is material feeding single roll crusher.
But because deflector chute is subject to the impact of thermal sintering cake for a long time under the high temperature conditions and washes away, traditional structure of material guiding chute easily produces wear and corrosion at high temperature and lost efficacy, and causes faults frequent in production process.And the integral replacing of deflector chute is more difficult, therefore maintenance load and consume material spare part amount greatly, have had a strong impact on the operating rate of sintering plant.
At present, the project organization of domestic tail gathering sill of sintering machine is almost identical, and whole deflector chute comprises base, cell body, scraper block, material blocking block and side plate.The impact of sinter cake when deflector chute cell body is mainly subject to sintering pallet blanking, cell body is at long-term high temperature with under impacting, and the steel plate of cell body can produce distortion and wearing and tearing, until damage to be repaired.Typical damageable zone has: the charging and discharging end of deflector chute and cell body connecting bolt.The middle part of tradition deflector chute is provided with material lining, material lining general employing steel plate is welded into the version that grid adds little square steel, and in use, material lining is constantly subject to the impact of thermal sintering cake to deflector chute, the material lining in service life not reaching expection toward contact is just smashed, and needs stop production to overhaul.Because material lining cannot be dismantled, be in most cases the cell body of integral replacing deflector chute, both consuming timely affect manufacturing schedule, also increased substantially production cost.
The life cycle of existing deflector chute is generally three months, and the time between overhauls(TBO) is then about 3 days.Although prior art discloses by using wear-resistant block to adopt rectangular block, being formed between its medial surface and last step caves in cheats, hole inner filling material can be utilized to form anti-wear-resisting and shock proof protection pile up, also have by having installed elastic device to deflector chute pedestal, impact when falling to sinter cake serves cushioning effect.But bear the main body of the impact of sinter cake still based on metal, potassium steel or high-chromium alloy are often selected in design.Potassium steel under the high temperature conditions military service antiwear property is low, and easily embrittlement; Although high-chromium alloy has excellent wear resistance, casting technique requires strict, and yield rate is low, and Technology for Heating Processing is complicated, and thus manufacturing cost is high.Moreover, the thermal conductivity factor of metal at 800 DEG C is general all at 30-40w/mk, and therefore metal base plate is in the process contacted with sinter cake, and heat can conduct to the key members such as cell body connecting bolt very soon, makes it because of metal fever fatigue failure.So the deflector chute in prior art after various improvement is still undesirable for service life.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of method improving the gathering sill of sintering device life-span, solves the sinter cake that is heated of deflector chute in prior art and impacts the technical problem of rapid wear.
For solving the problems of the technologies described above, the invention provides a kind of method improving the gathering sill of sintering device life-span, comprising the steps:
At the chute bottom plate weld anchor firmware of gathering sill of sintering device;
Then prolong end face at the discharging end of the chute bottom plate of described gathering sill of sintering device and build preformed bricks by laying bricks or stones;
Castable is dry mixed in agitator, and the stirring that adds water, then described castable be delivered in the chute bottom plate within the scope of described preformed bricks and pour into a mould, described anchoring piece is fastening to described castable.
Further, the root of described anchoring piece and the weld seam of described chute bottom plate all weld full.
Further, the brickwork joint of described preformed bricks is not more than 2mm.
Further, the anti-folding of described castable and withstand voltage properties as follows:
When temperature is 110 DEG C, the time, its fracture resistance was 19.20MPa after 24h, and its withstand voltage properties is 110.76MPa;
When temperature is 600 DEG C, the time, its fracture resistance was 23.15MPa after 3h, and its withstand voltage properties is 119.77MPa;
When temperature is 1000 DEG C, the time, its fracture resistance was 25.83MPa after 3h, and its withstand voltage properties is 192.70MPa.
Further, the thermal conductivity factor of described castable at 800 DEG C is 0.9-1w/mk.
Further, the ratio added water described in is the 6-7% of total castable weight.
Further, the instrument of described conveying castable is any one in dolly, hopper or pump.
Further, the construction method of described cast is sliding formwork mode or injection method.
Further, during described cast simultaneously to described castable vibration tamping.
Further, during described vibration tamping, vibrating head moves evenly by same direction, when slurry is returned on the surface of described castable, and after air pocket glows, is slowly extracted out by described vibrating head.
The method in raising gathering sill of sintering device life-span provided by the invention, the main body of deflector chute being born the impact of sinter cake has become the castable refractory of high strength from metal, greatly strengthen deflector chute shock-resistant, wear-resistant, corrosion resistance at high temperature, castable is not less than the compressive resistance of 110MPa, also can improve the toughness of castable further, strengthen wearability, the inventive method can make deflector chute at high temperature shock-resistant, wear-resistant, corrosion-resistant, and structure is simple, cost is not high, construction, easy to maintenance.
Accompanying drawing explanation
A kind of method step figure improving the gathering sill of sintering device life-span that Fig. 1 provides for the embodiment of the present invention;
The gathering sill of sintering device structural representation that Fig. 2 provides for the embodiment of the present invention;
Reference numeral:
1, deflector chute, 2, chute bottom plate, 3, preformed bricks, 4, anchoring hook, 5, castable.
Detailed description of the invention
See Fig. 1 and Fig. 2, a kind of method improving the gathering sill of sintering device life-span that the embodiment of the present invention provides, comprises the steps:
Step 101: at the chute bottom plate 2 weld anchor firmware 4 of gathering sill of sintering device 1;
Step 102: then prolong end face at the discharging end of the chute bottom plate of gathering sill of sintering device and build preformed bricks 3 by laying bricks or stones;
Step 103: castable 5 be dry mixed in agitator, and the stirring that adds water, then castable 5 be delivered in the chute bottom plate within the scope of preformed bricks and pour into a mould, anchoring piece 4 pairs of castables 5 are fastening.
A kind of method improving the gathering sill of sintering device life-span that the embodiment of the present invention provides, specifically comprises the steps:
Step: 201: draw grid line (requirement according to drawing) in the chute bottom plate of gathering sill of sintering device, at the contact place weld anchor firmware of grid lines, the root of anchoring piece and the weld seam of chute bottom plate all weld full, the effect of anchoring piece is to castable grasp, be fixed on deflector chute base plate, so in use, can not there is the danger of slippage easily in the resistance to material of castable;
Step 202: for ensureing that castable, under impacting by sintering nugget, slump and convenient construction does not occur, then prolong end face at the discharging end of the bottom land of gathering sill of sintering device and build preformed bricks by laying bricks or stones, the brickwork joint of preformed bricks is not more than 2mm, in brickwork joint, mud all should be full, jointing is answered on its surface, and the effect of preformed bricks mainly comprises two aspects; The first, because deflector chute base plate is an inclined-plane, and castable is the material with certain fluidity, and therefore first build row's brick by laying bricks or stones in the bottom on inclined-plane, from brick, carry out the construction of castable, such brick has undertaking power, convenient construction to castable.The second, deflector chute in use, and end face discharging position is damageable zone, if end face well damage, the danger of slump may occur castable above, and therefore laying bricks at end face serves protective effect to the overall structure of deflector chute.
Step 203: castable is dry mixed 2-3 minutes in agitator, and the stirring that adds water, the ratio added water is the 6-7% of total castable weight, and mixing time is 3-5 minute, then castable poured into a mould to the chute bottom plate within the scope of preformed bricks by cart transport, anchoring piece is fastening to castable.In embodiments of the present invention, also can by carrying in hopper or pump, in embodiments of the present invention, the anti-folding of castable and withstand voltage properties as follows:
When temperature is 110 DEG C, the time, its fracture resistance was 19.20MPa after 24h, and its withstand voltage properties is 110.76MPa;
When temperature is 600 DEG C, the time, its fracture resistance was 23.15MPa after 3h, and its withstand voltage properties is 119.77MPa;
When temperature is 1000 DEG C, the time, its fracture resistance was 25.83MPa after 3h, and its withstand voltage properties is 192.70MPa;
In embodiments of the present invention, the castable refractory of high strength, greatly strengthen deflector chute at high temperature shock-resistant, wear-resistant, corrosion resistance, thus significantly improve the service life of gathering sill of sintering device, save frequent maintain and replace cost, improve the operating rate of sintering plant, in addition, high-strength castable has the lasting compressive resistance being not less than 110MPa at 110-1100 DEG C, also can improve the toughness of castable further, strengthen wearability, the service condition of the large-type sinterer deflector chutes such as 550m2 can be met, and adopt slding form operation method can ensure speed of application and casting quality.
Wherein, the thermal conductivity factor of castable at 800 DEG C is 0.9-1w/m 〃 k; owing to only having the 2-3% of Thermal Conductivity by Using 30 ~ 40w/m 〃 k; greatly slow down the heat transfer of sintering deposit heat to hardwares such as deflector chute connecting bolts; reduce key position thermal fatigue failure probability, thus the available protecting overall structure of deflector chute.
Concrete pouring procedure is:
The time of cast is 30-40 minute, and that is, the material be stirred must be poured in 30-40 minute;
Wherein, the construction method of cast is sliding formwork mode or injection method, and concrete using method is:
Construction first adopts synovial membrane method, and simultaneously to castable vibration tamping during cast, sleiding form rises, until castable reaches the height of design.Must not shake for a long time on same position or regenerate during vibration, avoid the cast bed of material to produce segregation phenomenon.Must not vibrate disorderly in a jumble, during vibration tamping, vibrating head moves evenly by same direction, when slurry is returned on the surface of castable, and after air pocket glows, is slowly extracted out by vibrating head, avoids causing the cast bed of material because extracting excessive velocities and occurs cavity.Pour mass after casting and constructing completes, must not stand outer force-disturbance again before solidifying.
Finally, the deflector chute poured into a mould is placed in maintenance under normal temperature, curing time generally needs 48-72 hour.Carry out baking according to baking curve before use can come into operation.
After deflector chute uses a period of time, if the castable generation local damage on cell body, fall the phenomenons such as material, just need safeguard, described high-strength castable can be adopted to carry out spray repair construction in the mode of spraying to damage position, deflector chute overall pulling down, greatly need not save maintenance cost.
The method in the raising gathering sill of sintering device life-span that the embodiment of the present invention provides, the main body of deflector chute being born the impact of sinter cake has become the castable refractory of high strength from metal, greatly strengthen deflector chute shock-resistant, wear-resistant, corrosion resistance at high temperature, castable is not less than the compressive resistance of 110MPa, also can improve the toughness of castable further, strengthen wearability, the inventive method can make deflector chute at high temperature shock-resistant, wear-resistant, corrosion-resistant, and structure is simple, cost is not high, construction, easy to maintenance.
It should be noted last that, above detailed description of the invention is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to example to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not departing from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (10)
1. improve the method in gathering sill of sintering device life-span, it is characterized in that, comprise the steps:
At the chute bottom plate weld anchor firmware of gathering sill of sintering device;
Then prolong end face at the discharging end of the chute bottom plate of described gathering sill of sintering device and build preformed bricks by laying bricks or stones;
Castable is dry mixed in agitator, and the stirring that adds water, then described castable be delivered in the chute bottom plate within the scope of described preformed bricks and pour into a mould, described anchoring piece is fastening to described castable.
2. method according to claim 1, is characterized in that, the root of described anchoring piece and the weld seam of described chute bottom plate all weld full.
3. method according to claim 1, is characterized in that, the brickwork joint of described preformed bricks is not more than 2mm.
4. method according to claim 1, is characterized in that, the anti-folding of described castable and compressive resistance as follows:
When temperature is 110 DEG C, the time, its rupture strength was 19.20MPa after 24h, and its compressive resistance is 110.76MPa;
When temperature is 600 DEG C, the time, its rupture strength was 23.15MPa after 3h, and its compressive resistance is 119.77MPa;
When temperature is 1000 DEG C, the time, its rupture strength was 25.83MPa after 3h, and its compressive resistance is 192.70MPa.
5. method according to claim 4, is characterized in that, the thermal conductivity factor of described castable at 800 DEG C is 0.9-1w/ (mk).
6. method according to claim 1, is characterized in that, described in the ratio that adds water be the 6-7% of total castable weight.
7. method according to claim 1, is characterized in that, the instrument of conveying castable is any one in dolly, hopper or pump.
8. method according to claim 1, is characterized in that, the construction method of described cast is sliding formwork mode or injection method.
9. method according to claim 8, is characterized in that, simultaneously to described castable vibration tamping during described cast.
10. method according to claim 9, is characterized in that, during described vibration tamping, vibrating head moves evenly by same direction, when slurry is returned on the surface of described castable, and after air pocket glows, is slowly extracted out by described vibrating head.
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| CN201310476382.0A CN103542725B (en) | 2013-10-12 | 2013-10-12 | Method for prolonging service life of guide chute of sintering machine |
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| CN103542725B true CN103542725B (en) | 2015-05-27 |
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| CN109957650B (en) * | 2019-04-02 | 2021-05-04 | 中天钢铁集团有限公司 | Method and device for sintering divided surface layer |
| CN115057694B (en) * | 2022-07-08 | 2023-03-14 | 河南正杰新材料科技有限公司 | Corundum-mullite castable for sintering machine air box and precast block prepared from corundum-mullite castable |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN200979371Y (en) * | 2006-11-29 | 2007-11-21 | 中冶长天国际工程有限责任公司 | A stopping and cooling beam of a material guide groove at a sintering machine tail |
| CN201218659Y (en) * | 2008-04-18 | 2009-04-08 | 邯郸钢铁股份有限公司 | Gathering sill of sintering device |
| CN201397045Y (en) * | 2009-03-31 | 2010-02-03 | 高密市东冶机械制造有限公司 | Sintering machine side inlet hot blast interface |
| JP5263200B2 (en) * | 2010-03-01 | 2013-08-14 | 新日鐵住金株式会社 | Crushing guide |
| CN201731764U (en) * | 2010-06-11 | 2011-02-02 | 辽宁科技大学 | Sintering machine tail guide trough |
| CN201876125U (en) * | 2010-12-01 | 2011-06-22 | 中冶北方工程技术有限公司 | Buffering guide chute of sintering machine |
| CN203068968U (en) * | 2013-01-17 | 2013-07-17 | 辽宁科技大学 | Rear guide chute for sintering machine |
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Address after: 100041 Shijingshan Road, Beijing, No. 68, No. Co-patentee after: Shougang Jingtang Steel & Iron United Co., Ltd. Patentee after: Shougang Group Co. Ltd. Address before: 100041 Shijingshan Road, Beijing, No. 68, No. Co-patentee before: Shougang Jingtang Steel & Iron United Co., Ltd. Patentee before: Capital Iron & Steel General Company |
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