CN2184180Y - High temperature anti-scorching strip for sinter machine - Google Patents

Abstract

The utility model relates to a refractory burning loss preventing abnormity code steel grate strip used for sintering machines, which belongs to the technical field of the device of the sintering machine. The utility model is characterized in that both ends of a grate strip are hung with legs and are thickened; the cross section of the grate strip is of wedge shape; the middle segment of the grate strip is of a concave shape; the material of the grate strip contains traces of bismuth; the processed grate strip is strictly heated and annealed. The structure of the utility model not only has reasonable heat transfer, but also has high durability by thickened hanging legs on both ends. The grate strip has high temperature resistant and good burning preventing performance by the traces of bismuth and the heating annealing treatment, and then the service life of the grate strip is enhanced. The utility model can ensure a sintering machine to better run and can enhance production rate and production benefit.

Description

High temperature anti-scorching strip for sinter machine

The utility model relates to the grid section of a kind of sinter machine with the special-shaped malleable iron of high temperature resistant anti-scorching, belongs to the equipment and spare part field that sinter machine is used.

Used grid section has plain cast iron grid section and High-Chromium Cast-Iron Grate Bars on the existing sintering pallet.The main structure body of plain cast iron grid section is a strip, and it is rectangle that its two ends hang the legs break face up and down, and upper leg-hanging is very thin.Hanging leg up and down is fixed on the chassis beam, the grid section of plurality of fixed forms the material bed and bears the sinter mixture with ventilation property, with between the adjacent grid section of row even slit being arranged, the adjacent grid section of two rows end hangs between leg also the slit, during the ignition of sintering process burning, because the effect of vacuum fan, zone of combustion moves down the arrival grid section gradually from charge level, burn in the place that air-flow is big, and the grid section scaling loss is big; Grid section periodically bears the high temperature oxidation effect in sintering process, the surface constantly produces the squamous iron scale and peels off gradually, and the less grid section two ends upper leg-hanging that contacts with the bed of material flakes off at iron scale grid section is come off from the chassis beam automatically.So plain cast iron grid section scaling loss is serious, have only 3～6 months work-ing life.Plain cast iron grid section poor toughness also is easy to fracture in the transportation installation process.Though anti-scorching better performances that High-Chromium Cast-Iron Grate Bars is high temperature resistant, costing an arm and a leg of chromium improves the sintering cost greatly; And existing High-Chromium Cast-Iron Grate Bars two ends upper leg-hanging is equally very thin, section is rectangular, is still come off by scaling loss in sintering process, and work-ing life is still undesirable.

The purpose of this utility model is to provide a kind of sinter machine with the special-shaped malleable iron grid section of high temperature resistant anti-scorching, and its structure is beneficial to anti-scorching and heat transfer; Add trace bismuth, and grid section is carried out the heating anneal processing, its metallographic structure is changed, improve the high temperature resistant anti-scorching performance and the toughness of grid section, thereby improve the work-ing life of grid section, guarantee the constantly continuous ordinary production of sinter machine.

The utility model is realized its purpose by following technology contents.

Described sinter machine is to make mould by design requirements earlier with the special-shaped malleable iron grid section of high temperature resistant anti-scorching, this mould can guarantee to water to cast out thickeies grid section two ends upper leg-hanging, and make and hang the legs break face and be the grid section that wedge shape, stage casing are spill, delay iron scale with this and peel off the phenomenon that caused grid section breaks away from the chassis beam automatically, and help the grid section heat radiation and prevent the distortion of chassis beam; The smelting iron liquid that to prepare on request then carries out cast molding, and the composition of iron liquid is: C is 2.4～2.7%, Si is 1.4～1.7%, Mn is 0.4～0.7%, S＜0.2%, P＜0.15%, Cr≤0.06%, Bi trace, Fe surplus.The trace bismuth that adds in the iron liquid, the greying when in casting, hindering the foundry goods crystallization, and promote white pig iron to generate; Wherein the carbon major part is with Fe ₃C exists; The grid section that casting is good carries out heating anneal again in airtight process furnace handles, make cementite in the foundry goods be converted into ferrite and temper carbon to improve the toughness of grid section, meanwhile the grid section surface forms the half steel tissue of one millimeter, thereby improves the high temperature resistant anti-scorching performance of grid section.

The utility model has the advantages that: malleable iron grid section two ends upper leg-hanging thickness is big, extension legs break face is wedge shape, makes its prolonged anti-burning and has improved radiating condition; The trace bismuth element is arranged in the material of malleable iron grid section, and the greying when it hinders the foundry goods crystallization also promotes white pig iron to generate; Grid section is handled through heating anneal, make cementite be converted into ferrite and temper carbon changes metallographic structure, the grid section surface forms the half steel tissue of one millimeter in the while heat treatment process, institute is so that this grid section not only has high temperature resistant anti-scorching and antioxidant property, and has toughness preferably, therefore improved greatly grid section work-ing life, reduced consumption, thereby production cost is reduced greatly.

Further specify the utility model in conjunction with the accompanying drawings and embodiments.

Fig. 1 for sinter machine with the special-shaped malleable iron grid section of high temperature resistant anti-scorching longitudinal diagram.

Piece number among Fig. 1 (1) is grid section two ends upper leg-hangings, and piece number (2) is hung leg down for the grid section two ends, and piece number (3) is stage casing, a grid section top concave portions.

Sinter machine is produced as follows with the special-shaped malleable iron grid section of high temperature resistant anti-scorching: at first produce according to design requirements and guarantee that the upper leg-hanging thickening of grid section two ends, its section are that wedge shape, grid section stage casing are the mould of spill; With C be 2.4～2.7% then, Si is 1.4～1.7%, Mn is 0.4～0.7%, the cast iron liquid of S＜0.2%, P＜0.15%, Cr≤0.06%, Bi trace, Fe surplus is cast in the mould; The grid section of cast molding carries out heating anneal again in airtight process furnace handles, and so far makes sinter machine with high temperature resistant anti-scorching abnormal shape malleable iron grid section.

Claims (1)

1, a kind of sinter machine is with the special-shaped malleable iron grid section of high temperature resistant anti-scorching, and it is characterized in that: described grid section structure is that top, grid section two ends hangs the leg thickening, its section is wedge shape; The grid section stage casing is spill; The material of grid section is that C is 2.4～2.7%, Si is 1.4～1.7%, Mn is 0.4～0.7%, S＜0.2%, P＜0.15%, Cr≤0.06%, Bi trace, Fe surplus; Grid section after the cast molding carries out heating anneal in airtight process furnace handles.

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