CN201166509Y - Supercharging jet current type hot air meter dried furnace - Google Patents

Abstract

The utility model provides a pressure boost jet flow type hot air surface drying furnace, which mainly comprises a furnace body (1), a heating part, a hot air circulating part and workpieces, a material tray actuating mechanism and an exhaust part, wherein an electric heater of the heating part and a hot air circulating fan of the hot air circulating part are arranged in a heating chamber (2) on the top of the furnace body, the hot air circulating part mainly comprises a circulating fan, air-induced channels (3), a top air box, a bottom air box (5), return air boxes (6) and a return air channel, wherein the air-induced channels which are communicated with the heating chamber are symmetrically arranged on two sides of the furnace body and are respectively communicated with the top air box and the bottom air box, tuyeres are arranged on both the top air box and the bottom air box in the furnace body, and the return air boxes are arranged on two sides in the furnace body. A hot air forcible convective heat transfer mode and a hot air circulating design which are provided by the utility model enable heating elements not to radiate dried pieces directly, simultaneously, the temperature of hot air in the furnace is controlled accurately, the function of automatically powering off electric heating elements due to excessive temperature is provided, and thereby the pressure boost jet flow type hot air surface drying furnace can not generate the phenomenon that inner cone overburning or overheating lowers the intensity and even produces waste products.

Description

Supercharging jet flow hot blast surface drying stove

Technical field

The utility model belongs to drying plant, proposes a kind of supercharging jet flow hot blast surface drying stove, is mainly used in cold core---the oven dry of resin bonded sand mould of casting industry.

Background technology

Resin bonded sand mould (core) surface drying technology and clay sand mold drying process are different, resin bonded sand mould (core) water content is lower, be generally 0.2-0.3%, its water content adopts the moisture of the surperficial water based paint infiltration of just sand mold (core) of the required drying of water based paint surface drying technology to not influence of casting quality.Simultaneously, because the restriction of resin sand technology, baking temperature generally is no more than 200 ℃, according to practical experience, the moisture depth of penetration is generally 6-8mm behind the applying coatings, therefore under the situation that satisfies manufacturing technique requirent (10-12mm place, top layer, dry back residual moisture content), should shorten drying time as far as possible.In the actual production of coremaking line and foudry line line; temperature is lower than 50 ℃ when requiring cold core to enter casting and molding; as surpassing this temperature; the vacuum protection film will soften and damages and gas leakage and can't operate as normal; require core accumulation of heat when the surface drying stove comes out minimum thus, the core self-temperature is also lowered.Existing drying mode has: 1, direct baking formula, and be about to core and be placed on oven dry in the baking box, skin drying and core body inside can't be dried, and the core amount of stored heat is very big.2, directly core is put in the baking box of the agitating heating that stirs blower fan and toasted, though utilize brushing and add heat energy the core surface being dried as early as possible of wind,, be difficult to make the core surface to be heated evenly because sand mold itself is irregular, so have dead angle, the core quality that is difficult to obtain.

Summary of the invention

The purpose of this utility model promptly is to propose a kind of supercharging jet flow hot blast surface drying stove.

The technology that the utility model proposes supercharging jet flow surface drying stove constitutes: this drying oven mainly comprises body of heater, heating part, hot air circulation part and workpiece, charging tray transmission mechanism and discharge portion; The hot air circulation blower of the electric heater of heating part and hot air circulation part is arranged in the heating clamber at body of heater top, and the hot air circulation part mainly comprises circulating fan, wind channel, top, bottom bellows and air-intaking box, air-return duct; The wind channel that is communicated with heating clamber is symmetricly set on the body of heater both sides and is communicated with top, bottom bellows respectively, makes hot blast enter the temperature unanimity that guarantees each position hot blast of bellows simultaneously from the bellows two ends; On top in body of heater, the bottom bellows tuyere is set all, reaches the bottom downwards from the stove inner top and upwards directly blow to the core surface thereby make hot blast be jet-like through tuyere; Both sides in body of heater all are provided with air-intaking box and the air-intaking box of both sides are communicated with heating clamber by air-return duct respectively; To concentrate on to reheat in the heating clamber by the hot blast that returns by air-intaking box, air-return duct in the body of heater and then send in the stove, and make hot blast form circulation by the high temperature circulation blower fan.Sub-fraction is that the steam vent that furnace body wall sets discharges out of the furnace by exhaust apparatus, carries out hydrofuge.

The surface drying stove that the utility model proposed adopts the principle of hot blast forced-convection heat transfer, the structural design of its hot air circulation part makes the hot blast that returns in the stove be heated by the electric heater of the electrical heating chamber of electrical heating chamber, pass through wind channel by circulating fan then, bellows are jet-like by tuyere and upwards directly blow to the core surface from downward the reaching of stove inner top by the bottom, because circulating air has enough speed, make hot blast have enough penetration powers, be convenient to hot blast formation turbulent condition in the stove simultaneously, core is heated evenly, the heat absorption of core surface is fast, after hot blast is passed to core to heat, through air-intaking box, air-return duct turns back in the heating clamber and reheats, move in circles thus, help energy savings.Hot blast forced-convection heat transfer mode and hot air circulation design, make the not direct radiation of heating be dried part, the localized hyperthermia district can not appear, hot blast temperature precise control in the stove simultaneously, and be provided with overtemperature and cut off the electrical heating elements function automatically, can not cause the core burning or overheatedly its intensity is reduced even the waste product phenomenon occurs.The dry tack free of core can be divided into three steps simply: carburation by evaporation after (1) surface moisture is heated; (2) surperficial steam passes through the hot blast of turbulent condition fast to diffusion all around; (3) moisture of sand mold inside moves to the top layer under diffusion power, temperature difference dynamic action.Because of the restriction of resin sand technology, hot blast temperature generally is no more than 200 ℃.Owing to the hot blast of high speed recurrent state is arranged in the stove, has accelerated the core top layer and heated up and water evaporates speed, and shortened drying time.

Description of drawings

Accompanying drawing is the utility model drying oven structural representation.

Among the figure, 1, body of heater, 2, heating clamber, 3, wind channel, 4, air-return duct, 5, top, bottom bellows, 6, air-intaking box, 7, workpiece transfer roller rod, 8, charging tray returns the roller rod, 9, charging tray.

The specific embodiment

In conjunction with the accompanying drawings the utility model embodiment is illustrated:

As shown in drawings, the utility model drying oven mainly comprises body of heater 1, heating part, hot air circulation part and workpiece, charging tray transmission mechanism and discharge portion; Body of heater 1 is welded into skeleton by shaped steel, the steel plate of on the skin of the corresponding position of skeleton, burn-oning, the close weldering galvanized steel plain sheet of internal layer is formed casing, in fill out heat-preservation cotton and form the drying oven body of heater, be furnished with the warm air curtain that blows downwards on stove gate top, two ends, wrap color steel, around furnace roof, be welded with guard rail in the both sides of whole body of heater, as inspection platform, there is the staircase can upper and lower people at the checkered steel plate of the shaped steel upper berth of furnace roof weldering one deck δ=3mm in a side.Body of heater is made up of preheating zone, baking zone, in the preheating zone, baking zone respectively has and overlap independently loop heating system.Each hot air circulation part mainly comprises circulating fan, wind channel 3, top, bottom bellows 5 and air-intaking box 6, air-return duct 4; The electric heater of heating part and hot air circulation blower are arranged in the heating clamber 2 at body of heater top, wind channel 3 is symmetricly set on the body of heater both sides, the one end is communicated with heating clamber 2, top, bottom bellows 5 in the other end and the stove are communicated with, makes hot blast enter the temperature unanimity of each position hot blast of assurance bellows simultaneously from the bellows two ends; Make the hot blast temperature of the surface of the work that blows to from tuyere identical.On top in stove, the bottom bellows 5 hot blast nozzle is set and makes tuyere become matrix form to arrange, make hot blast be jet-like and upwards directly blow to the core surface downwards and from the bottom from the stove inner top through tuyere.Both sides in body of heater all are provided with air-intaking box 6 and air-intaking box 6 are communicated with heating clamber 1 by air-return duct 4 respectively, to concentrate on to reheat in the electric heater by the hot blast that returns by air-intaking box 6, air-return duct 4 in the body of heater and then send into again in the stove, and make hot blast form circulation by circulating fan.

The charging tray 9 that core is housed is placed on the workpiece live-roller rod 7 and advances with required speed, be heated oven dry back after come out, core is taken away by manipulator, charging tray 9 returns roller rod 8 by charging tray and sends original position back to, use for loading and transporting core once more, wherein workpiece transfer roller rod 7 and charging tray return roller rod 8 transmission mechanism for the existing technical pattern that generally adopts, this is not done too much explanation.

Claims (1)

1, a kind of supercharging jet flow hot blast surface drying stove is characterized in that: drying oven mainly comprises body of heater (1), heating part, hot air circulation part and workpiece, charging tray transmission mechanism and discharge portion; The hot air circulation blower of the electric heater of heating part and hot air circulation part is arranged in the heating clamber (2) at body of heater (1) top, and the hot air circulation part mainly comprises circulating fan, wind channel (3), top, bottom bellows (5) and air-intaking box (6), air-return duct; The wind channel (3) that is communicated with heating clamber (2) is symmetricly set on body of heater (1) both sides and is communicated with top, bottom bellows (5) respectively; Top in body of heater (1), bottom bellows all are provided with tuyere on (5); Both sides in body of heater (1) all are provided with air-intaking box (6) and the air-intaking box of both sides are communicated with heating clamber (2) by air-return duct respectively.