CN2182971Y

CN2182971Y - Box type electric resistance furnace

Info

Publication number: CN2182971Y
Application number: CN 93214729
Authority: CN
Inventors: 高明淮; 高东岭
Original assignee: ZIBO ELECTRIC RESISTANCE FACTORY
Current assignee: ZIBO ELECTRIC RESISTANCE FACTORY
Priority date: 1993-06-05
Filing date: 1993-06-05
Publication date: 1994-11-16
Anticipated expiration: 2003-06-05

Abstract

The utility model relates to a box type electric resistance furnace, which belongs to the class of box type electric resistance furnaces. The utility model comprises a rectangle box type furnace casing, firebricks and a fibre felt layer which are lined on the inner wall of the furnace, hangers on both lateral walls, and a ribbon screw flat tubular heating element which is laid at the bottom of the furnace. The utility model is provided with a turnover type worktable and an open and close device of a furnace door, and the open and close device of a furnace door makes the furnace door elastically contacted and pressurized to seal. The utility model has the advantages of high thermal efficiency and uniform temperature in furnace, the service life of the furnace can be prolonged by more than 4 times, and the weight of the furnace body can be reduced by 1/3 to 1/2; the heating element has the advantages of easy production, easy installation, convenient maintenance, no decoupling and short circuit and low possibility of burnout; because of the adoption of the turnover type worktable, the operation is convenient and labor-saving. The utility model can be widely used for heat treatment, drying, thermal insulation, etc. for metal materials.

Description

Box type electric resistance furnace

This resistance furnace belongs to the chamber type electric resistance furnace class in the industrial electroheat equipment.

The chamber type electric resistance furnace that prior art provided has following weak point: furnace sealing is not tight, builds furnace lining by laying bricks or stones with refractory brick and fire clay, and heat radiation, accumulation of heat loss are greatly; Full in the fire door with refractory brick and fireclay lining, weight is big, during keying and the firedoor frame sliding friction, and the rigidity contact, there is big gap, furnace heat is overflowed, reduce the thermal efficiency, cold air is got into burner hearth, quicken heating element heater and be heated the oxidation of workpiece, and furnace temperature is inhomogeneous, fire door easy fracture, the service life of reducing stove; Heating element heater generally adopts the round kiln filament winding to become helix, with the slotting internal protecting wall that is hung on of refractory rod, or adopt the inflection of bandlet shape stove silk to become snakelike rectangular shape, make resistance bandwidth face parallel with internal protecting wall, all reverse 90 ° on inflection place both sides, contact with inserting the excellent face of extension, this two kinds of form heating element heaters radiation is overflow disorderly, and self produces barrier, hang trouble, easily come off, blow or short circuit, produce easy wiping of warpage and bump workpiece; Operating desk is plug-type, heavy, effort.

The object of the present invention is to provide a kind of body of heater that adopts the MULTILAYER COMPOSITE furnace lining, the fire door that Elastic Contact is airtight, convertible workbench is easily carried out the chamber type electric resistance furnace of the ribbon-type heating element of hanging.

Technical solution of the present invention in conjunction with the accompanying drawings 1, chamber type electric resistance furnace structural representation, Fig. 2. chamber type electric resistance furnace front view, Fig. 3. fire door hold-down mechanism schematic diagram, Fig. 4. the alumina silicate fiber felt piece is described further.

This chamber type electric resistance furnace as shown in Figure 1 and Figure 2, it by rectangle with iron plate, angle bar, The box furnace shell 8 that band iron is welded, two madial walls, rear wall, firedoor frame and furnace bottom are built refractory brick heat-insulation layer 15 by laying bricks or stones with high-alumina lightening refractory brick and fire clay, two side, rear wall, firedoor frame both sides attach alumina silicate fibre carpet veneer 9 with alumina silicate fiber felt piece as shown in Figure 4, furnace roof is hung, the full fibre felt layer 9 of door lining, the felt piece is that both sides add heat-resisting steel sheet and plate 37 and clamp compression with heat resisting steel pull bar 36 series connection alumina silicate fiber felts 38, and the spot welding of pull bar two ends is given jack panel and made. Heating element heater 11,14 is band shape spiral flat drum shape, the coated change radiance of appearance infra-red paint, high-alumina ceramic tube 10 with two heat-resistant steel cores struts, give in the hole of staying with the L shaped heat resisting steel hook 12 tight fire brick layers that insert again, the hook of upper porcelain tube head-up, lower porcelain tube is suspended to fibre felt layer 9 with heating element heater and gives in the rectangular recess of staying down, and its two ends pass rear furnace wall and connect power-line terminal. The heating element heater 14 coiling shapes of furnace bottom are with the furnace wall heating element heater, strut with two heat-resistant steel core high-alumina ceramic tubes to be placed in the groove that furnace bottom refractory brick gives staying, and by putting drop-bottom 13, electric sensor 7 is vertically buried at the furnace roof middle part underground above it. Establish support 3 above the furnace shell at fire door place, horizontal support rotating shaft 27, its left end key dress rope sheave 1, in the race around steel wire rope 24, one end is fixed on the rope sheave, other end suspention counterweight block 25, middle key fills two rope sheaves 1, is fixed on the rope sheave around steel wire rope 24 1 ends in the race, and the other end suspends respectively the middle part of fire door 28 left and right sides in midair, fire door central authorities establish peep-hole, its both sides are welded with handle 29, and rotating shaft 27 right-hand member keys dress hinge wheel 2 connects the minor sprocket 6 of installing on the furnace shell side through chain 4, minor sprocket patches crank 5 alive, vertically is welded two on the furnace shell 8 of fire door 28 both sides

Shape is contained the track 18 of interior square groove, and fire door two sides fill four guide wheels 26 and are embedded in the track slot, and the guide wheel below the fire door is in track

During lower end upper/lower positions, top guide wheel can enter in the race 19 of track convex, in track 18 outside furnace shells installings by three connecting rods 22, pitman shaft 23, welding handgrip 21 on the intermediate connecting rod, the fixing fire door hold-down mechanism 20 as shown in Figure 3 of small rod axle head, this mechanism is by nut 31, spring 32 sliding bars 33 pinch rollers 34, Xiao's axle 35 consists of, with above-mentioned rotating shaft 27, rope sheave 1, steel wire rope 24 counterweight blocks 25, sprocket wheel, chain

Shape track 18 consists of door open and close device, has in this deviceShape track 18. Welding bench support on the furnace shell 8 below the fire door, horizontal installation platform rotating shaft 17 on it, workbench 16 is welded in the rotating shaft 17, workbench 16 be can be around the shaft the rectangular slabs of 17 upsets. The workbench right flank leaves rotating shaft one segment distance parallel shaft welding bench crank 30 and forms with the electrical control cabinet that the instrument formations such as electric power meter, electric current, voltage, temperature control are housed.

Operation of this chamber type electric resistance furnace and industry operation:

1, at first connect power supply, when fire door is in uppermost position in fig-ure, push down travel switch, heating element heater is an off-position;

2, rotate counterclockwise crank 5 alive, through minor sprocket, chain, hinge wheel drives rotating shaft 27 and rotates counterclockwise, and then to be parallel to firedoor frame along track 18 with fire door descending for the guide wheel on the fire door, and counterweight block 25 is up, this moment, fire door just left travel switch, heating element heater is connected power supply, and when fire door during near upper/lower positions, the guide wheel 26 below it enters

Shape track hypomere inclined-plane, make the fire door downside gradually near firedoor frame, just be adjacent to stove gate bottom during to upper/lower positions, make fire door be in outward-dipping state, then clockwise pushing hands 21, make the pinch roller 34 of hold-down mechanism push away door upper part through three-link mechanism, guide wheel above the fire door enters race 19, makes a just individual fire door be close to firedoor frame, and spring 32 is compressed energy storage, this space-time stove heats up, or heated parts.

3, heating finishes, shake hands counterclockwise earlier 21, pinch roller leaves fire door, fire door is because of the deadweight flare, and top guide wheel withdraws from race 19, clockwise rotates crank 5 again, go upward to the extreme higher position through the transmission system fire door along track, bump travel switch, cut off the electricity supply, counterweight block drops to extreme lower position balance fire door weight.

4, during the loading, unloading workpiece, lift workbench crank 30, workbench 17 rotates 270 ° to snap into stove gate concordant with drop-bottom around the shaft, and workpiece loading and unloading finishes, and reverses 270 °, makes workbench sagging naturally, is convenient to the fire door keying.

This chamber type electric resistance furnace has following advantage:

1, adopt the infrared coating heating element heater of being with shape spiral flat drum shape and scribbling high radiant rate, swept area doubles many, improves its surperficial blackness, directed radiation conducts heat, and the heat release condition is good, and thermal discharge is big, thermal efficiency height, improve more than 14% than the existing band shape snake shape heating element heater thermal efficiency, temperature is even in the stove, and this heating element heater is easy to manufacture, it is convenient to install, change, can not take off extension, short circuit is difficult for blowing.

2, fire door is in light weight, during keying not with the firedoor frame friction, be not worn, do not rupture, with the firedoor frame Elastic Contact, pressurization, furnace heat can not scatter and disappear from the fire door gap, and cold air does not advance burner hearth, heating element heater and be heated workpiece and air isolated, can be not oxidized, can make furnace life prolong more than 3 times;

3, body of heater adopts the MULTILAYER COMPOSITE furnace lining, and overall tightness is good, weight saving 1/3～1/2, and heat radiation, accumulation of heat are lost little, and good heat insulating can increase the burner hearth dischargeable capacity.

4, adopt convertible workbench, easy to operate, save working space and be convenient to the fire door keying.

This chamber type electric resistance furnace can extensively be adapted to the annealing of metal material, and tempering, normalizing, carburizing, nitrogenize, charcoal nitrogen ooze altogether, aluminising, and the baking vanish of boronising heat treatment and every profession and trade, oven dry, insulation etc. are a kind of desirable industrial electroheat equipment.

Embodiment:

Claims

1, a kind of chamber type electric resistance furnace, it is by the box furnace shell 8 of rectangle, interior wall liner fire brick layer 15 attaches refractory fibre carpet veneer 9 again, and furnace roof is hung, the full fibre felt layer of door lining, the stove madial wall is hung, furnace bottom is laid stratie 11, establish door open and close device on 14 fire doors top and the both sides furnace shell, stove gate is made up of workbench 16 and electrical control cubicles, it is characterized in that, heating element heater 11,14 is band shape spiral flat drum shape, and door open and close device has

Shape track 18.

2,, it is characterized in that described workbench 16 is the rectangular slabs of 17 upsets around the shaft by the described chamber type electric resistance furnace of claim 1.

3, by the described chamber type electric resistance furnace of claim 1, it is characterized in that said heating element heater 11,14 surperficial coated infra-red paints.