SU714125A1 - Elevator-type clean tempering furnace - Google Patents

Description

(54) ELEVATOR FURNACE FOR LIGHT HOLIDAY

 - - -, The invention relates to heat treatment and can be used in machine building for processes requiring heating to 200-700 ° C and cooling in a protective gas medium. ; Furnaces known for light tempering and other heat treatment processes are known, consisting of a heating chamber with a heater and a fan, a device closing the heating chamber (cover, lid), and a tambour (not in all furnaces) adjacent to the heating chamber. Chamber 1 and 2. Such furnaces include a shaft furnace of the type CW3. However, the need to cool the cage with the oven to obtain a bright surface dramatically lengthens. duty cycle. Depending on the load, the cooling time of such a furnace from to 150 is 20-40 hours. Because of the large storage capacity of the furnace, the transition from operating temperature to another (especially from high to low) takes a long time. In the chamber mechanized electric furnaces of a universal purpose, in front of the heating chamber there is a loading vestibule, in which the atmospheric change and cooling of the Cladder are performed. the auger enters the outside air, which is oxidizingly cooling the charge there. Therefore, in order to obtain the Light surface of the parts during tempering or annealing, the furnace must operate in a full heating-cooling cycle for one charge, THAT reduces the possible productivity of the furnace. A known elevator furnace containing ps5d heating chamber with a cooling kaMepa heater, connected to a vestibule in which a device for moving cage 3 is housed. The entire heat treatment cycle is extended for a long time, and a quick transition from one heat treatment temperature to another is almost impossible.,. The purpose of the invention is the time mixing of the processes of heating and cooling a a f

NII cages and ensuring rapid transition from one temperature to another.

The goal is achieved by supplying a heating chamber installed in a subdivision of its part with a fan and a refrigerator, and the device for moving the load is made as. trolleys with a reinforcement mounted on it for closing the openings between the cooling chamber and the vestibule. The refrigerator is made in the form of a bundle of pipes.

FIG. 1 is shown pop. river section; in fig. 2 / - section A-A in FIG. one.

The furnace has a heating chamber i with a circulation fan 2, .. located in its upper part. The heater 3 and the refrigerator 4 are located in the lowering (during the movement of the circulating furnace atmosphere) heating kayer shaft. In the lifting shaft of the heating chamber are located 5, 5 more than the container 6 with heated products, the heating heater is located: the heater lEKpSciaets the flap 7, under the heating The camera has a vestibule 8 with a trolley 9 with a damper 10 and a drive 11 fixed on it, the Tambour 8 is connected to the chambers ryazh, price 12, and the fans 13. The tambour 8 is closed by the doors 14. Under the vestibule 8 there is a lift 15, yvakschy (functionally) tambour 8 works with heating -Pech leduyuschim Obra Zoom.

In the heating chamber 1, the container 6 with the charge is heated. The other container, the heat treatment of which is buried, stands on the trolley 9, located on the right and the right cooling chamber 12 in the compartment 10 and the damper 10. Here the cooling down of the charge takes place with the help of the fan 13. At the end of the bladder after 14 sections are unloaded, B the seat is put on a yueug, the door 14 is closed and the section is pre-filled with nitrogen.

At the end of the heating, the container in the heating chamber 1 opens the shutter 7, lifts container 15 above holder 5, the last 5 of them slide, pick 6 tons of battery 15, set the container with cage on hedgehog 9 (shown in dotted lines).

With water 11, the trolley 9 is moved to the left, the left 10 cooling chamber 12 is cut off with the flap 10, and already there the cooling takes place. Container loaded into the Yaraguy chamber

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passes into the vestibule section 8, lifts it into the heating chamber 1 with a lift 15, holders 5 slide in, lift 15 down, leave the container on the holders 5, close the flap 7 and begin the heating process. ..

Further operation of the furnace is similar. Unloading, loading of containers is carried out alternately in

cooling chamber 12. The cooling time of the container corresponds to the heating time, which makes it possible to use the heating chamber almost completely in time.

When moving from a higher temperature

the smaller one is switched off to the heater 3, the air npocqc is turned on through the refrigerator 4, and the circulation of gas, ocymeJT by the fan 2, contributes

rapid cooling of the heating

cameras 1,

The use of this furnace allows simultaneous cooling of the cage in a protective atmosphere and heating of the loaded cage, eliminating the ingress of outside air into the furnace during the process of loading and unloading, to produce accelerated cooling of the furnace.

Claims (1)

1. Electrotherms, M., 1971, 107, p. 3, Fig. one. 2, Electrotherms, M., 1967, No. 63, p. 6, fig. one. .3. USSR author's certificate 209511, cl. From 21 D 9/00, 06.06.66.