CN86205750U - Well type annealing furnace of wire stock - Google Patents

Abstract

The utility model discloses a well type annealing furnace of wire material, which is mainly used for the metallothermic processing, particularly for the annealing processing of the wire material and the band material. The well type annealing furnace of wire material adopts the integral installation seal and the vacuum annealing and thus a series of indirect loss caused by oxidation is reduced. The wire material is directly heated in the furnace and thus the direct heat energy loss of the heat transfer of the tank wall can be reduced. A metallic reflection screen is simultaneously adopted in the tank to use the secondary radiation energy and the function of an electric heating body can be sufficiently displayed. The utility model also adopts the power matching circuit with accurate temperature control, temperature increase time reduction, heat efficiency improvement and great amount of energy saving and the optimum annealing quality of the wire material is obtained.

Description

Well type annealing furnace of wire stock

The utility model belongs to metal heat treatmet, is specially adapted to annealing processing such as wire rod, band.

Present normally used resistance annealing stove, major part is made up of tank body and body of heater two portions.During operation, earlier with in the wire rod tank filling.Cover and seal up (sand seal or water seal).Then tank body is hung in the stove, be heated to the processing requirement temperature, after the insulation, hang out tank body.Naturally cooling outside stove is finished annealing.

This annealing furnace has following shortcoming:

1, tank body heating: during annealing, tank body always with the annealing wire rod together, tank body weight is suitable wire rod weight almost, tank body is along with wire rod heats, loss is nearly half, and prolongs heat-up time.Reduced production efficiency;

2, tank body damages: when tank body cools off outside stove internal heating or stove, its jar face directly contacts with air, produce oxidation, make the tank skin attenuation and damage, particularly when tank body by stove in on when hanging out, tank body need bear own wt and wire rod weight simultaneously, under hot situation, tank body is owing to stressed overweight be elongated or tank body lands accidentally, and pot bottom is impacted and deformation takes place, the tank body damage has been quickened in this kind deformation.

3, excessive gas radiation loss: overflow gas and radiation loss mainly are to produce in annealing, tank body hangs in or when hanging out body of heater, fire door always opens wide fully, exposes in air, at this moment a large amount of gas and radiation losses of overflowing are arranged, this loss is decided by that fire door opens wide the length of time, crane working time, workman's operating time, as a whole, the unlatching rate is high more, and it is long more that fire door opens wide the time, and calorific loss is big more;

4, indirect loss: present employed annealing furnace, wire rod are in jar, and with sand seal or water seal, purpose is to prevent that extraneous air from entering tank interior, prevent wire rod oxidation in annealing process, but under antivacuum state, still have in jar to contain the oxygen air, at high temperature can make the wire rod oxidation, after annealing, there is oxide skin to exist, before the next procedure, the peeling process certainly will be arranged, chemical peeling particularly, consume a large amount of acids industrial chemicals, in acid cleaning process, produce industrial waste, polluted source, need purifying treatment, cause indirect energy loss, old-fashioned in a word annealing furnace, efficient is low, it is big to waste energy, the cost height, the annealing wire quality is not good.

The purpose of this utility model is that on structure, change on the technology increases new functional component, to reach the purpose of high energy saving with former annealing furnace redesign.

The utility model design is as follows:

1, on the structure: replace hot tank body with cold tank body, cancellation is to the direct heating of tank body, not only reduced nearly half calorific loss, prolonged the tank body life-span again, overcome the disadvantage that tank body often damages, reduced indirect energy loss simultaneously, the wire rod heating is direct by indirect variable, has significantly reduced conduction loss;

2, on the technology: adopt rough vacuum, the remaining space that has replaced entire equipment, can prevent the oxidation of wire rod, electric heating element, radiation shield etc., because the cold tank body that this device is employing to be sealed and the cold hearth body case of sealing are formed the annealing device of one, overcome former hot tank body and be difficult to bear pressure, so that the difficult problem of distortion.This device provides simple and reliable for the wire rod vacuum annealing, easily processing condition.

3, on the furnace lining: the stove internal reflection screen that adopts stainless steel to be welded into, it is a cylindrical metal furnace lining that has top opening only, replaced the furnace lining that light body refractory brick is built into, because radiation shield can be heating at the infrared rays opposite with wire direction, reflect back equably, realized orientation, the direct radiation heating has effectively utilized the secondary rays energy.

Radiation shield is after 800 ℃ of oxidations, and radiation coefficient ε t reaches 0.85; And general light body refractory brick radiation coefficient ε t is below 0.3, during the every increase by 0.1 of the radiation coefficient of furnace lining, fractional energy savings can improve about 5%, so the radiation shield fractional energy savings can improve more than 20%, improve the utilization of secondary rays energy so greatly, improved thermo-efficiency significantly.

Evenly whether furnace temperature is resistance furnace important technology index, and the furnace temperature inequality is not fully utilized the total heating efficiency of equipment, must prolong heat-up time, also influences annealing quality, requires furnace lining that bigger thermal conductivity is arranged for this reason, to reach the uniform purpose of furnace temperature.The thermal conductivity of radiation shield is greater than 73～244 times of light body refractory brick thermal conductivity, utilize the metallic reflection screen to do furnace lining, give full play to electric heating element under working condition, radiating capacity maximizes the use, and the metal furnace lining has kept the advantage of light body refractory brick, has improved the thermal conductivity and the radiation coefficient of furnace lining simultaneously, overcome light body refractory brick temperature of furnace lining inequality, physical strength is low, and is high temperature resistant poor, disadvantages such as furnace lining structure slit.

4, insulation measure: use water seal between cold tank body footing and the bell body, inner fire door, the material frame, electric heating element, whole annealing device such as radiation shield, all operations under rough vacuum is hedged off from the outer world state, the loam cake of fire door and the sand seal of cold tank body base, suitable again one outer field " big well lid " so just formed the combination " bell " of novel annealing furnace, and its function is to reduce the gas that overflows, convection current and conduction loss, because stove top case has self adiabatic measure,, reduced radiation loss widely so have suitable envrionment temperature heat transfer temperature difference little again in the jar.

5, accurately automatically controlled: as to use the automated power matching circuit, replace temperature-adjusting circuit commonly used, after wire rod is gone into stove, in order to overcome thermal inertia,, promptly carry out high-power heating so strengthen heating, so as to rapid raising temperature of furnace lining, the temperature difference between increase and the wire rod shortens retardation time, the raising of temperature of furnace lining, making its radiating capacity be index curve by the furnace lining surface temperature increases, therefore after wire rod is gone into stove, adopt and strengthen heating, obvious energy-saving effect is arranged.(as shown in Figure 3).

When temperature rises, method with the break make ratio that changes circuit, become power control, debug out the Best Times constant T of resistance furnace, satisfy the requirement of processing requirement and maximum output, so as to overcoming since when design power match not good, when perhaps producing, change material, specifications etc. cause the unmatched result of power, for reaching this purpose, the main weight break point of common intensification index curve, with the temperature is detection signal, carry out automatic sequence control, make this curve become approximate intensification straight line, and shorten retardation time, move after order makes the intensification straight line, reach whole process best power coupling.With existing annealing furnace relatively, the utility model has following advantage, flexible and convenient operation, thermo-efficiency height, significantly save energy, and can obtain best wire annealing quality.

Accompanying drawings the utility model embodiment: well formula wire annealing stove, structurally divide two portions up and down, top is cold tank body (2), cold tank body top is provided with the lifting telpher of lifting, this telpher is made up of motor (33), speed reduction unit (34), scroll (35) and wireline (36), and the travelling block (4) in jar is linked to be a lifting with material frame (10).

The bottom is annealing furnace main part (27), be provided with stainless steel radiation shield (15) in the stove, electric heating element (13) is installed in the screen, be connected with extraneous by node (14), screen is outer to be the backing (9) that is built into ultralight body refractory brick, shell is to adopt the continuous seal welding cylinder of steel plate (8), bell body (19) top is provided with water seal arrangement, in order to overhaul and convenient transportation, the bell body separates with body of heater, is provided with installation work weld seam (18), and bell body middle part is provided with air inlet and cuts down (31), air-breathing cutting down (25), (30) are cut down in water inlet, (26) are cut down in water outlet, for water seal recirculated water usefulness, thermometric device thermopair (6), vacuum is inhaled hole (17), the bell body props up dish (16), electric heating element connection terminal (7), two fixing electric heating element terminals (12), cold tank body slide rail (32).So that material frame (10) lifting arbitrarily.

Working process:

1, when filling with substance: cold tank body (2), by large crane coupling hook (20), transport to the charging place, start telpher the material frame in the jar is fallen on the charging ground, feed, after finishing, start telpher, go back up in the jar, wait for annealing, material frame (10) rises or descends in jar, is with manual control, put in place stop up and down two lead limit switches (21) (23) automatically control finish;

2, during annealing: the cold tank body that has installed by the large crane handling, to the body of heater of well formula wire annealing stove, aiming at safety falls, starting vacuum pump bleeds, start telpher simultaneously, to the material frame in the jar, slowly fall in the stove, carry out rough vacuum annealing, integral body equipment between cold tank body (2) and the bell body (19) seals, it is footing (5) by tank body, ring-like rubber packing (1), the tanks above the bell body (24) etc. are formed the water seal link, and the breach (11) of base of cold tank body (29) and material frame loam cake (22) or material frame base (28) is formed the sand seal link;

When 3, coming out of the stove: start telpher, with the wire rod of annealing and finishing.Get back in the cold tank body together with material frame (10), carry out sand seal (as Fig. 2) equally between material frame base (28) and the cold tank body base (29), must air will be squeezed in the stove in advance, cold tank body just possesses the condition of slinging, otherwise negative pressure can't be sling, by large crane cold tank body is hung the cooling place, slowly cool off, finish annealing.

Description of drawings:

Structure iron when Fig. 1 is well formula wire annealing furnace annealing;

Fig. 2 is before the well formula wire annealing furnace annealing or the structure iron after the annealing.

Claims (2)

1, a kind of well formula wire annealing stove, it is made up of hot tank body and body of heater two portions, and feature of the present utility model is:

1) there is liftable material frame (10) its inside of cold tank body (2);

2) (15) are shielded in the metallic reflection that has stainless steel to be welded in the body of heater (27), and have the sealed cylindrical of upper opening only;

2,, it is characterized in that at bell body middle part air inlet being housed cuts down (31), air-breathing cutting down (25) by the described well formula of claim 1 wire annealing stove.

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