CN103486859A - Method for casting inner chamber lining of induction heating furnace - Google Patents

Abstract

The invention belongs to the field of induction heating furnaces, and particularly relates to a method for casting an inner chamber lining of an induction heating furnace. The method includes: processing quartz sand used for casting, eliminating lumps, magnetic impurities and other non-quartz-sand impurities for meeting the standards of particle size and mass percentage, adding AL2o3 (Alumina) and water after drying for manufacturing casting raw materials, casting the furnace bottom and the furnace wall of the induction heating furnace, tamping repeatedly during casting, placing a crucible core at the center of the knotted furnace bottom during the casting of the furnace wall, and finally, casting a furnace mouth and adding water glass or clay in the raw materials during the casting of the furnace mouth. By the aid of the method, the service life of thermal insulating materials of the inner chamber lining of the induction heating furnace is improved one time from 6 months to 12 months.

Description

A kind of interior thorax lining casting method of induction heater

Technical field

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

Background technology

Induction heater, be to be to be 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 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; because being vertical top, blank enters in coil; so the liner of coil wearing and tearing, 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, carry out according to following step:

Step 1, quartz sand for casting is processed, removed block, magnetic foreign material and other non-quartz sand foreign material, carry out slow drying and processing, bake out temperature is 200 ℃～300 ℃, and more than insulation 6h, quartz sand composition used is according to mass percent: SiO ₂99%, CaO<0.5%, MgO<0.5%, FeO<0.5%, Al ₂o ₃<0.5%, H ₂o<0.5%, quartz sand composition used according to the granule size proportioning is: what particle was 1.70mm～0.85mm accounts for 35%～40%, particle is 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 1, add the AL that accounts for quartz sand quality of materials 5%～10% ₂o ₃, add the water that accounts for quartz sand quality of materials 1%～2%, mix rear placement 1h～2h;

Step 3, with asbestos cloth, cover the induction heater inner surface, step 2 proportioning, good compound 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, the crucible core is placed on to the furnace bottom center tied, and the good compound of step 2 proportioning is inserted to the tamping repeatedly of crucible core surrounding, and then add tamping again, thickness to reach from induction heater to stop during several the second induction coil position from top to bottom;

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

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

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

The specific embodiment

A kind of interior thorax lining casting method of induction heater, carry out according to following step:

Step 1, quartz sand for casting is processed, removed block, magnetic foreign material and other non-quartz sand foreign material, carry out slow drying and processing, bake out temperature is 200 ℃～300 ℃, and more than insulation 6h, quartz sand composition used is according to mass percent: SiO ₂99%, CaO<0.5%, MgO<0.5%, FeO<0.5%, Al ₂o ₃<0.5%, H ₂o<0.5%, quartz sand composition used according to the 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 1, add the AL that accounts for quartz sand quality of materials 5%～10% ₂o ₃(can use the rare powder of high-quality high alumina, AL ₂o ₃proportion will meet the demands), add the water that accounts for quartz sand quality of materials 1%～2%, mix rear placement 1h～2h;

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

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

During knotting, (tamping process repeatedly is 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 descends, the service life that is conducive to improve the induction furnace furnace lining.

Press the internal diameter 230mm induction heater of above-mentioned material, formula reparation, after coming into operation, the life-span was brought up to 12 months by 6 months.

Claims (1)

1. the interior thorax of an induction heater serves as a contrast casting method, it is characterized in that carrying out according to following step:

Step 1, quartz sand for casting is processed, removed block, magnetic foreign material and other non-quartz sand foreign material, carry out slow drying and processing, bake out temperature is 200 ℃～300 ℃, and more than insulation 6h, quartz sand composition used is according to mass percent: SiO ₂99%, CaO<0.5%, MgO<0.5%, FeO<0.5%, Al ₂o ₃<0.5%, H ₂o<0.5%, quartz sand composition used according to the granule size proportioning is: what particle was 1.70mm～0.85mm accounts for 35%～40%, particle is 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 1, add the AL that accounts for quartz sand quality of materials 5%～10% ₂o ₃, add the water that accounts for quartz sand quality of materials 1%～2%, mix rear placement 1h～2h;

Step 3, with asbestos cloth, cover the induction heater inner surface, step 2 proportioning, good compound 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, the crucible core is placed on to the furnace bottom center tied, and the good compound of step 2 proportioning is inserted to the tamping repeatedly of crucible core surrounding, and then add tamping again, thickness to reach from induction heater to stop during several the second induction coil position from top to bottom;

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