CN2144284Y - Resistance furnace for annealing aluminium material - Google Patents

Abstract

The utility model provides a box type framework resistance furnace for annealing aluminium material with a greater loading capacity, which is characterized in that the draught fan is both-way reversible axial flow fan, the furnace pressure sampling tube is a closed conduit which connects the hearth and the furnace pressure indicating device. The utility model concurrently adopts multiterm technical characteristics: a both-way axial flow fan, a collecting and distributing type temperature control system, a direct cooling furnace door sealing cutter, and an indicating and alarming device which can monitor the furnace pressure in the practice cases. The utility model has the advantages of enhancing the controlling temperature precision obviously, ensuring the homogeneity of the furnace gas, shortening the time to counterbalance the temperature, and meanwhile, improving the sealing performance of the furnace door, extending the service life of the sealing materials, and more safety fume exhaust system.

Description

Resistance furnace for annealing aluminium material

The utility model relates to is the aluminium blank after rolling or the relatively large chamber type electric resistance furnace of finished product aluminium foil annealing usefulness, belongs to non-ferrous metal process equipment or Equipment for Heating Processing.

Because the aluminum metal physical characteristic determines that aluminium annealing can only be taked the mode of low-temperature heat and convection heat transfer' heat-transfer by convection, and is very strict for the uniformity requirement of furnace gas temperature.In 150～550 ℃ setting warm area, in the certain hour behind the arrival insulation point, the each point temperature difference is answered≤3 ℃～5 ℃ in the stove, to prevent hot-spot, influences material property.Annealing furnace in big useful load manufactures and designs in the process, realize that this point is the comparison difficulty, and major influence factors is the air quantity of blower fan, the precision of temperature controlling instruments, body of heater air-tightness etc.

At present, the relatively large box annealing electric furnace of domestic production, basic comprising is similar.Constitute the stove casing as all-metal framework fill insulant material; Bayonet type heating element heater correspondence is hung in the upper furnace both sides, by guiding device itself and labor and materials shallow storage space is separated, and forms the heat exchange air channel; Be positioned at the blower fan of furnace roof central authorities, force the furnace gas folk prescription to give heat to circulation; For preventing that fire door distortion from leaking and oven door sealing material too fast aging, the inboard of sealing with the tabular envelope cutter of fire door at firedoor frame is provided with the indirect water-cooling passage; Generally there is not the furnace pressure indicating device.Temperature controlling instruments adopts monomer decentralized method control power supply executing agency more.In sum, prior art adopts the circulation of one-way shaft flow fan to conduct heat, and air quantity is less, and samming speed is slow, and annealing process is prolonged; Monomer distributing temperature control, poor reliability, temperature-controlled precision is lower, can't manage concentratedly or the multiple devices team control, has both just selected smart instrumentation for use, can not work out process curve easily, and monitors whole annealing process, operates more loaded down with trivial details; The indirect water-cooling mode of fire door envelope cutter, radiating effect is undesirable, makes expensive encapsulant comparatively fast aging, has increased the maintenance cost of producing; Do not have the furnace pressure indication, can't observe furnace pressure at any time and change, can only set the smoke evacuation cycle with temperature, safety coefficient is low.

The purpose of this utility model is to improve the above-mentioned deficiency of prior art, comprehensively domestic and international in recent years aluminum industrial new technology and equipment, and the aluminium that is suitable for 15～50 tons of batches of releasing a kind of excellent performance is rolled up, sheet material annealing electric furnace.After tested, the interior each point temperature difference of burner hearth is below ± 3 ℃.The scheme that realizes is to adopt the bidirectional reversible axial flow blower simultaneously, concentrates-the distributing temperature-controlling system, integrated direct-cooling type fire door envelope cutter and multinomial technology such as furnace pressure indication, warning device, and its characteristic is as follows:

1. bidirectional reversible blower fan, can force furnace gas reciprocally from the labor and materials upper and lower to giving heat, average temperature performance obviously improves, and has offset some irrational furnace gas distribution factor, has reduced the unidirectional chance of protection network under the aluminium foil clogged with fragments blower fan when giving wind.Because two-way blower fan flabellum inclination angle big (about 60～65 °), air quantity increases, the heat exchange efficiency height, thus shorten the heating-up time, save power consumption.

2. concentrate-the distributing temperature-controlling system, make host computer with microcomputer, expansion is easy, but the multimachine team control.Guaranteed the uniformity of annealing aluminium quality.System hardware selection standard universal component, easy to maintenance, mix hanzi system, operate very simple.Slave computer is selected separate intelligent temperature control instrument for use, and constitutes communication network.Prepare different sensor and executing agency, this system can control process variables such as temperature, pressure, flow, liquid level, and its temperature-controlled precision can reach ± and 1 ℃, screen shows and printer has made things convenient for monitoring and record.

3. integrated direct-cooling type fire door envelope cutter is to replace tabular band steel with seamless steel pipe, and continuous welding forms closed water circulation system in the position of the corresponding doorframe strip of paper used for sealing of fire door periphery with circulating water pipeline.Collection compresses and dispels the heat and is one, and radiating condition obviously improves, and has effectively prevented fire door distortion, leakage, has prolonged the service life of encapsulant (especially silicone rubber kinds), and processing is also simplified more.

4. furnace pressure detects indicating device, pipeline by sealing is communicated with the capsule pressure gauge of burner hearth with the band warning function, can show intuitively that furnace gas pressure changes, when aluminium rolling lubricating oil in the stove is met a large amount of volatilization of heat, furnace pressure rises, the prompting smoke evacuation, safe in utilization to ensure stove, the furnace pressure numerical value change also can show the air-tight state of body of heater, fire door simultaneously.

Concrete formation of the present utility model is provided by following embodiment and accompanying drawing.

Fig. 1 is that generalized section is looked in 45 tons of aluminum foil finished products furnace sides.

Fig. 2 is this embodiment elevation cross-sectional view.

Fig. 3 is an oven door sealing mode partial enlarged drawing.

Fig. 4 is a collecting and distributing type temperature-controlling system schematic diagram.

Further specify the concrete structure and the operation principle of present embodiment below in conjunction with accompanying drawing.

This embodiment adopts box metal structure to contain the airtight body of heater [1] of heat insulation layer, and 1 or many bidirectional reversible axial flow blowers [2] subregion are installed on furnace roof central authorities.Guiding device [5] is divided into two parts with burner hearth, and the mesozone is labor and materials [3] shallow storage space, and two lateral areas are the furnace atmosphere circulation heat exchanger channels, and bayonet type electric heater [6] equidistantly is hung on two wing passages top.Fig. 2 arrow is represented furnace atmosphere circulation direction and path, and when blower fan [2] when being rotated in the forward, furnace gas passes through passage and labor and materials [3] again through heater [6] heat exchange, gets back to blower fan [2] inlet, finishes once circulation; Behind the certain hour of interval, the controlled reverse rotation of blower fan [2], furnace gas by labor and materials [3], passes through passage, heater [6] earlier again, gets back to blower fan [2] outlet.Forward and reverse rotation of blower fan is finished by automatic control system.Furnace pressure probe tube [4] stretches out from burner hearth, is connected with the control room capsule pressure gauge through closed circuit pipeline, and this Pressure gauge has alarm settings mechanism.The elevator oven door sealing structure of Fig. 3 for amplifying, the tubulose envelope cutter [7] of fire door periphery, be closed circuit water circulating pipe, when fire door compresses, tubulose envelope cutter [7] correspondence is pressed on elaxtic seal strip of paper used for sealing [8] surface around the firedoor frame, forms the water-cooled heat-exchange system of fire door and encapsulant thereof jointly with firedoor frame water-cooling groove [9].When the temperature-controlling system that Fig. 4 shows is worked, set the process curve of respectively controlling object, send each the next instrument to by network by up-computer.The setting value that the next instrument is sent here according to host computer and the measured value of controlled device relatively constitute the control loop of a closed loop.Simultaneously, host computer is respectively controlled the parameters of object and the next instrument itself by network collection, handles through data, shows on monitor with forms such as chart, literal.When arts demand or host computer fault, the next instrument can also independently be finished monomer temperature control process.Host computer can be selected the microcomputer more than 286 grades, and the next instrument can be one or more intelligent digital temperature controller, and executing agency is the silicon controlled power modulation device, and sensor is adaptive thermocouple.The quantity of executing agency and sensor can be selected type and quantity according to specification requirement, during temperature control and the next instrument be complementary.

Mechanical, electrical control of other of present embodiment and interlock alarm system are finished by other automatic control system.

Claims (1)

1, a kind of aluminium resistance annealing stove, particularly a kind of relatively large box metal structure aluminium resistance annealing stove.Its composition is, the center of top that contains the airtight body of heater [1] of heat insulation layer in box metal structure is installed one or more blower fan [2] and by guiding device [5] burner hearth is divided into labor and materials [3] shallow storage space and furnace atmosphere circulation heat exchanger channels, bayonet type electric heater [6] equidistantly is hung on the passage top, furnace roof is equipped with furnace pressure probe tube [4], and the elevator fire door adopts tubulose envelope cutter [7] sealing.By microcomputer and temperature controller control furnace temperature, it is characterized in that: blower fan [2] is the bidirectional reversible axial flow blower; Furnace pressure probe tube [4] is for being communicated with the closed conduit of burner hearth and furnace pressure indicating device; The closed circuit water circulating pipe of the fire door tubulose envelope integrated direct-cooling type of cutter [7]; The microcomputer temperature control system makes host computer by microcomputer, and the intelligent digital temperature controller is made the next instrument, constitutes the distributing microcomputer temperature control system of concentrating.

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