CN2492327Y

CN2492327Y - Three-phase arc heater for intermediate ladle of horizontal conticaster

Info

Publication number: CN2492327Y
Application number: CN 01249827
Authority: CN
Inventors: 雷森田; 庄斌星
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-06-13
Filing date: 2001-06-13
Publication date: 2002-05-22
Anticipated expiration: 2011-06-13

Abstract

The utility model disclose a three-phase voltaic arc heating device for a horizontal continuous caster tundish, which mainly can restore the heat loss of the tundish during the continuous casting process, and further develops the advantage of the level continuous casting. The lower portion of the tundish of the utility model is held by a hydraulic system hydro cylinder, three electrode holes are opened on a top cap, and the bottom portion of tundish body is provided with an argon-blowing hole, the outlet of the tundish body is provided with a sliding nozzle, the outside of the tundish body is provided with a rotation elevating system, the end is provided with a heating electrode. The utility model has the advantages of simple structure, low energy-consuming, thereby the quality of the product is better.

Description

Horizontal caster tundish three-phase electric arc heater

The utility model relates to the tundish three-phase electric arc heater of metallurgy industry continuous casting installation for casting, particularly a kind of horizontal caster.

Along with DEVELOPMENT OF CONTINUOUS STEEL CASTING TECHNOLOGY, horizontal casting is very promising.Existing horizontal casting, molten steel inject tundish from ladle and begin continuous casting, up to having cast, do not have heater.Liquid steel temperature is up to 1500-1600 ℃, the continuous casting of molten steel (second-rate) of one bag 30t needs 70-80 minute, owing to will remedy the radiation loss of ladle and tundish, the initial temperature that must improve molten steel could finish by continuous casting morely, so just brought adverse consequences: one, steel-smelting electric furnace tapping temperature want high, the duration of heat is long, and lining durability is short, makes molten steel production cost height; It is excessive that two, continuous casting plays last temperature difference, strand internal crystallization poor quality; Three, molten steel long period in tundish remains static, and alloy composition is easy to generate segregation; Even four, liquid steel temperature is enough high, " freezing the mouth of a river " fault often takes place when producing the light section strand, make the continuous casting failure; When five, continuous casting is ended for some reason, do not damage, must pour the molten steel in the tundish into the slag basin rapidly, waste very big in order to protect tundish.In a word, because the problem of tundish molten steel cooling, the popularization of horizontal casting has run into serious hindrance.

The purpose of this utility model is to provide a kind of tundish three-phase electric arc heater of horizontal caster, and the thermal loss of the tundish in the casting process is replenished, and further brings into play the advantage of horizontal casting.

The purpose of this utility model is achieved in that

Its tundish 21 bottoms have three electrode holes by 18 clampings of hydraulic system oil cylinder on the top cover 19, the inclusion bottom is provided with argon blowing hole, and the inclusion outlet is provided with slide gate nozzle 22; Inclusion is provided with rotation and lifting mechanism outward, and the end is provided with heating electrode 15.

Above-mentioned said rotation and lifting mechanism, its platform 5 belows are provided with the amount of passing through motor 1, reductor 2, gear ring 4 for a short time; Gear ring 4 and 5 fastening linking to each other of platform, platform 5 tops are provided with the interchange amount of passing through motor 6, reductor 9 for a short time, and steel cable 12 is walked around reductor 9, assembly pulley 11, connect counter weight 10 and electrode dolly and support arm 13; Electrode dolly and support arm 13 ends are provided with electrode dop 14 and electrode 15, and electrode dolly and support arm 13 can move on column 3.

Advantage of the present utility model is that heating system is simple in structure, makes easily, and the operational reliability height, Operation and Maintenance is simple.Owing to have heating measure, electric furnace steel tapping temperature can reduce 30-40 ℃ (for example, grade of steel 20Mnsi can drop to 1610-1620 ℃ by 1650-1660 ℃), saved melting electric consumption 20-30KWh/t, lining durability improves 10-15%; Because the thermal agitation of adding measure is arranged, continuous casting billet quality improves, and the molten steel billet yield also improves; Because the heating measure is arranged, the many continuous casting of molten steel that suffer defeat after defeat in the past, the production of light section steel billet are realized smoothly.

Below in conjunction with accompanying drawing the utility model is further described.

Fig. 1 is overall structure signal and the flow chart with horizontal caster of tundish three-phase electric arc heater.Molten steel in the tundish 21 forms the base shell of band liquid core by slide gate nozzle 22 and crystallizer 23, on front roller-way 27, move, the pulling of strand is by Blank drawing machine 28, through behind last Blank drawing machine, cut into scale strand 29 by synchronous shearing machine or flame cutter 24, be transported to cold bed by back roller-way 30 then.

Fig. 2 is the structural representation of tundish 21 among Fig. 1.

Fig. 3 is the vertical view of Fig. 2 tundish inclusion 21.

Fig. 4 is the system diagram of rise fall of electrodes automatic regulator.

Fig. 5 is the rotor structure figure of motor 6 among Fig. 4.

Fig. 6 is the schematic diagram of three-phase heating power supply.

The utility model is by forming with the lower part: three-phase heating power supply system (), electrode automatic lifting system (two), column rotary system (three), tundish clamping system (four), tundish BOTTOM ARGON BLOWING system (five).

Described three-phase heating power supply system (one) is as Fig. 6 and shown in Figure 4, the high voltage source of 6-10KV bus 45 is powered to furnace transformer 48 through isolating switch 46 and vacuum switch 47, the low-tension supply of appropriate numerical value arrives graphite electrode 15 through copper bar 49, flexible cable 38, contact tube 50, electrode dop 14, three electrodes that are arranged in equilateral triangle insulated from each other insert in the tundish, produce arc light between electrode and the molten steel, tundish has obtained supplemental heat source.

Electrode diameter D1 of the present utility model, electrode pitch circle diameter D2, tundish inside diameter D 3 is rationally supporting with heating voltage numerical value, just makes tundish three-phase electric arc heating technique have practicality and economy.According to the size of tundish capacity, electrode diameter D1 gets Φ 150mm or 200mm; Electrode pitch circle diameter D2 gets Φ 350-Φ 400mm; Tundish inside diameter D 3 is got Φ 1200mm-Φ 1600mm.Heating voltage is got 80-120V (line voltage), and the thickness L2 of tundish slag 32 remains on 30-40mm, and the tundish that capacity is little takes off limit, and tundish capacious is capping then.Middle clad 19 is to make insulation usefulness, is knotted into arch, and the tundish cylinder-packing is quoted the calcium magnesia brick.

Described electrode automatic lifting system (two) is as Fig. 4 and shown in Figure 1, the size of heating power is sent into comparator 41 after handling by current transformer 37 detections and through arc current processor 39, the height of heating voltage is sent into comparator 41 after handling through arc voltage, when the given heating power of actual heating power and operator is close, comparator 41 no-outputs, frequency converter 42 is no-output also, motor 6 is not charged, gear 7, reductor 9, reel 8, steel wire rope 12, electrode dolly 13 all remain static, and this device is kept given power and continued heating.When actual heating power departs from given heating power, if bigger than normal, electrode dolly 13 contains along fluctuating orbit 16 and promotes, to reduce power; If less than normal, electrode dolly 13 can descend along track 16, and is high-power to add.The speed that electrode dolly 13 moves according to the size of deviation by the frequency converter stepless time adjustment.Counter weight 10 is connected with electrode dolly 13 with assembly pulley 11 by steel cable 12, its gross mass balance is followed the tracks of the continuous variation of going up liquid steel level in the casting process fast to realize rise fall of electrodes, and string is not moving up and down to guarantee electrode, do not contact molten steel (if contact molten steel meeting carburetting destroys slab quality).

The parts of rise fall of electrodes most critical of the present utility model--motor 6 (also comprising electric rotating machine 1) is the special interchange amount of passing through motor for a short time, as shown in Figure 5, its stator winding 43 is similar to common squirrel-cage motor, and rotor 44 is hollow steel, material 10#-45# steel, wall thickness 10-12mm, its rotary inertia GD ²Very little, starting torque is big, and starting current only is the 35-40% of squirrel-cage motor, and the starting heating only is 1/6-1/8, can satisfy the requirement of following the tracks of fast, for example moves 2-3 time each second, and each electrode moves 1-2mm.This motor does not have fan blade, and full-closed structure only depends on casing heat radiation, be big at EAF dust, temperature is high, the optimal motor of operation under the environment harsh conditions.

Described column rotary system (three) is to be provided with for tundish (or ladle) can both heat in several position.The utility model can rotate three electrodes, heats with interior a plurality of positions at the hexagonal angle degree.As shown in Figure 1, three electrodes 15 stretch out column 3 center line 2500mm-3000mm, sufficiently long support arm is arranged, when needs change heating location, see Fig. 1 and Fig. 4, be transferred on the motor 1 with the output of switch on the operating desk frequency converter 42, by reductor 2 gear ring 4 is rotated on column 3, gear ring 4 connects together with the platform 5 of support electrode automatic lifting system, so the entire electrode jacking system just turns to new position.In order to make the steady and accurate positioning of rotation, motor 1 also adopts the frequency conversion stepless time adjustment.This feature of the present utility model has satisfied the following operating procedure of horizontal casting fully: the first, can heat the ladle that fills molten steel, and wait for that the second stove steel can be connected to such an extent that come up just with the injection of the molten steel in ladle tundish continuous casting; The second, heating is just at the tundish of continuous casting; Three, before tundish replenishes molten steel, this device must rotate and leave; Four, when the handling tundish was wanted in the unexpected termination of generation continuous casting, this device can be outwarded winding rapidly.

The flat clamping system of described tundish (four) is provided with for the quick handling of tundish.The horizontal casting tundish is to use several bolting on dolly, can not dismantle rapidly.The utility model tundish is controlled by the solenoid directional control valve of Hydraulic Station with oil cylinder 18 (see figure 1) that is fixedly clamped, the clamping of oil cylinder with unclamping; Before the continuous casting, tundish 21 hangs the relevant position of dolly 25, and the left-hand direction is by the link stopper location, location of dolly, the throwing axis direction is by oil cylinder 18 location, tundish starts dolly and moves oil cylinder 17 after clamping, and dolly 25 moves toward crystallizer 23 directions on rail 26, after tundish 21, slide gate nozzle 22 and crystallizer 23 all are adjacent to, reduce the pressure of oil cylinder 17, can not exceed by bleed-out water, this moment, preparation finished, can inject molten steel to tundish, the beginning continuous casting.When the unexpected termination of continuous casting takes place when, at first close slide gate nozzle 22 (magnetic valve one oil cylinder actuating), unclamp oil cylinder 18 then, rotatable heater, gantry hook of crane can hook 20 handlings of tundish gudgeon goes out.

The utility model is provided with suitable blowing argon gas device at the bottom of the continuous casting tundish.As shown in Figure 2, argon gas enters the pocket block passage that is full of molten steel by Argon pipe 34 and air brick 35, about channel diameter Φ 60mm, pressure with 0.2-0.3Mpa is blown, molten steel 33 obtains appropriateness and stirs, convection current is realized through electric arc heated temperature higher molten steel and bottom molten steel in top, and temperature is even, the uniform purpose of alloy composition thereby reach.Simultaneously, the molten steel in the pocket block passage can not solidify yet.If continuous casting is ended because of link fault such as Blank drawing machine, crystallizer, chilled(cooling) water supply (CWS), so, timely handling tundish is to the ingot casting district or return electric furnace, opens slide gate nozzle 36, can or melt down the molten steel ingot casting in the tundish fully, not exist liquid steel temperature to be forced to the problem of outwelling inadequately.

Claims

1, a kind of horizontal caster tundish three-phase electric arc heater, it is characterized in that: the bottom of tundish (21) is by hydraulic system oil cylinder (18) clamping, have three electrode holes on the top cover (19), the inclusion bottom is provided with argon blowing hole, and the inclusion outlet is provided with slide gate nozzle (22); Inclusion is provided with rotation and lifting mechanism outward, and the end is provided with heating electrode (15).

2, horizontal caster tundish three-phase electric arc heater according to claim 1 is characterized in that: above-mentioned said rotation and lifting mechanism, and its platform (5) below is provided with the amount of passing through motor (1), reductor (2), gear ring (4) for a short time; Gear ring (4) and fastening linking to each other of platform (5), platform (5) top is provided with the interchange amount of passing through motor (6), reductor (9) for a short time, and steel cable (12) is walked around reductor (9), assembly pulley (11), connects counter weight (10) and electrode dolly and support arm (13); Electrode dolly and support arm (13) end is provided with electrode dop (14) and electrode (15), and electrode dolly and support arm (13) can be gone up at column (3) and move.