CN103486859B - A kind of interior thorax lining casting method of induction heater - Google Patents

Abstract

The invention belongs to induction heater field, specifically a kind of interior thorax lining casting method of induction heater.To casting quartz sand process, remove block, magnetic foreign material and other non-quartz sand foreign material and meet granularity and mass percent standard, after oven dry, adding AL ₂o ₃and water, be made into casting raw material to feeling that heating furnace carries out furnace bottom and cast in furnace wall, tamping is repeatedly carried out in casting, crucible core is wanted to be placed on the hearth center tied when carrying out furnace wall casting, finally carry out fire door casting, will add waterglass or clay in the feed during fire door casting, the present invention makes thorax lining heat-insulating material in induction heater double service life, brings up to 12 months by 6 months.

Description

A kind of interior thorax lining casting method of induction heater

Technical field

The invention belongs to induction heater field, specifically a kind of interior thorax lining casting method of induction heater.

Background technology

Induction heater is located by the pressure strip at two ends by water-cooled copper coil winding, by an insulation cross beam support, makes it form a firm frame for movement, for installing on the vertical plane.Coil liner internal diameter 210mm-310mm; in coil, thorax is lined with layer of insulation material; its outside is the protection of quadrant hull shape stainless steel liner plate; enter in coil because blank is vertical top; so the liner wearing and tearing of coil, high temperature dress state heat-insulating material life expectancy are main bugbears, present situation is under normal running conditions the most multiplex 6 months.

Summary of the invention

Technical problem to be solved by this invention is: how to promote in induction heater thorax lining heat-insulating material service life.

The technical solution adopted in the present invention is: a kind of interior thorax lining casting method of induction heater, carries out according to following step:

Step one, use quartz sand process to casting, remove block, magnetic foreign material and other non-quartz sand foreign material, carry out slow drying and processing, bake out temperature is 200 DEG C ~ 300 DEG C, and insulation more than 6h, quartz sand composition used is according to mass percent: SiO ₂>99%, CaO<0.5%, MgO<0.5%, FeO<0.5%, Al ₂o ₃<0.5%, H ₂o<0.5%, quartz sand composition used according to granule size proportioning is: particle be 1.70mm ~ 0.85mm account for 35% ~ 40%, particle be 0.85mm ~ 0.425mm account for that 25% ~ 30% particle is less than 0.053mm account for 25% ~ 30%;

In step 2, the quartz sand material that configures in step one, add the AL accounting for quartz sand quality of materials 5% ~ 10% ₂o ₃, add the water accounting for quartz sand quality of materials 1% ~ 2%, mix rear placement 1h ~ 2h;

Step 3, cover induction heater inner surface with asbestos cloth, the compound that step 2 proportioning is good is inserted furnace bottom tamping repeatedly, and then add tamping again, filling number of times is 4 ~ 5 times, last gross thickness is 30mm ~ 50mm, crucible core is placed on the hearth center tied, and compound good for step 2 proportioning is inserted the tamping repeatedly of crucible core surrounding, and then add tamping again, thickness reach from induction heater from top to bottom several second induction coil position time stop;

Step 4, in the compound that step 2 proportioning is good, add the waterglass accounting for mixture quality 10%-15% or the clay accounting for mixture quality 10%-15%, mix, on the basis that step 3 completes, insert the tamping repeatedly of crucible core surrounding, and then add tamping again, finally reach induction heater fire door concordant till.

The present invention builds respectively according to furnace bottom, furnace wall, fire door order, adopts the baking of science and sintering specification when building.

The invention has the beneficial effects as follows: in induction heater, thorax lining heat-insulating material doubles service life, 12 months are brought up to by 6 months, for cost budgeting problem, the expense of refractory material depot repair is in the past about 150,000, after independently improveing exploitation, the maintenance of refractory material can be carried out in this locality, and expense is about 50,000 yuan, greatly reduces cost.

Detailed description of the invention

An interior thorax lining casting method for induction heater, carries out according to following step:

Step one, use quartz sand process to casting, remove block, magnetic foreign material and other non-quartz sand foreign material, carry out slow drying and processing, bake out temperature is 200 DEG C ~ 300 DEG C, and insulation more than 6h, quartz sand composition used is according to mass percent: SiO ₂>99%, CaO<0.5%, MgO<0.5%, FeO<0.5%, Al ₂o ₃<0.5%, H ₂o<0.5%, quartz sand composition used according to granule size proportioning is: particle be 1.70mm ~ 0.85mm (10 ~ 20 order) account for 35% ~ 40%, particle be 0.85mm ~ 0.425mm (20 ~ 40 order) account for that 25% ~ 30% particle is less than 0.053mm (270 order) account for 25% ~ 30%;

In step 2, the quartz sand material that configures in step one, add the AL accounting for quartz sand quality of materials 5% ~ 10% ₂o ₃(the rare powder of the high alumina of high-quality can be used, AL ₂o ₃proportion will meet the demands), add the water accounting for quartz sand quality of materials 1% ~ 2%, mix rear placement 1h ~ 2h;

Step 3, cover induction heater inner surface with asbestos cloth, the compound that step 2 proportioning is good is inserted the tip drill rod tamping repeatedly that furnace bottom diameter is 12 ~ 14mm, and then add tamping again, filling number of times is 4 ~ 5 times, last gross thickness is 30mm ~ 50mm, crucible core is placed on the hearth center tied, the compound that step 2 proportioning is good is inserted the tamping repeatedly of crucible core surrounding, and then add tamping again, thickness reach from induction heater from top to bottom several second induction coil position time stop;

Step 4, in the compound that step 2 proportioning is good, add the waterglass accounting for mixture quality 10%-15% or the clay accounting for mixture quality 10%-15%, mix, on the basis that step 3 completes, insert the tamping repeatedly of crucible core surrounding, and then add tamping again, finally reach induction heater fire door concordant till.

During knotting, (tamping process is repeatedly also casting cycle) quartz sand size should must not be evenly distributed and produced segregation, and the layer of sand density after knotting is high, and the probability cracked after sintering declines, and is conducive to the service life of improving induction furnace furnace lining.

By the internal diameter 230mm induction heater that above-mentioned material, formula are repaired, after coming into operation, the life-span brought up to 12 months by 6 months.

Claims (1)

1. an interior thorax lining casting method for induction heater, is characterized in that carrying out according to following step:

Step one, use quartz sand process to casting, remove block, magnetic foreign material and other non-quartz sand foreign material, carry out slow drying and processing, bake out temperature is 200 DEG C ~ 300 DEG C, and insulation more than 6h, quartz sand composition used is according to mass percent: SiO ₂>99%, CaO<0.5%, MgO<0.5%, Fe ₂o ₃<0.5%, Al ₂o ₃<0.5%, H ₂o<0.5%, quartz sand composition used according to granule size proportioning is: particle be 1.70mm ~ 0.85mm account for 35% ~ 40%, particle be 0.85mm ~ 0.425mm account for 25% ~ 30%, what particle was less than 0.053mm accounts for 25% ~ 30%;

In step 2, the quartz sand material that configures in step one, add the AL accounting for quartz sand quality of materials 5% ~ 10% ₂o ₃, add the water accounting for quartz sand quality of materials 1% ~ 2%, mix rear placement 1h ~ 2h;

Step 3, cover induction heater inner surface with asbestos cloth, the compound that step 2 proportioning is good is inserted furnace bottom tamping repeatedly, and then add tamping again, filling number of times is 4 ~ 5 times, last gross thickness is 30mm ~ 50mm, crucible core is placed on the hearth center tied, and compound good for step 2 proportioning is inserted the tamping repeatedly of crucible core surrounding, and then add tamping again, thickness reach from induction heater from top to bottom several second induction coil position time stop;

Step 4, in the compound that step 2 proportioning is good, add the waterglass accounting for mixture quality 10%-15% or the clay accounting for mixture quality 10%-15%, mix, on the basis that step 3 completes, insert the tamping repeatedly of crucible core surrounding, and then add tamping again, finally reach induction heater fire door concordant till.