US1027471A - Annealing-furnace. - Google Patents

Description

H. GKRTNER.

ANN BALING FURNACE.

APPLIOATION FILED JAN. 23, 1912 Patented May 28, 1912.

3 SHEETS-SHEET 1.

H. GKRTNER.

ANNEALING FURNACE. APPLICATION FILED JAN. 23, 1912.

Patented May'28, 1912.

3 SHEETS-SHEET 2.

V firm EITGKRTNER. ANNEALING FURNACE.

AP PLIGATION FILED JAN. 23, 1912.

Patented May 28, 1912.

3 SHEETSSHEET 3 Q Ja UNITED .aEBMAnN' GARTNER, or LINTOR-F, NEAR DUSSELDORF, GERMANY.

ANNnALmG-rURNacE.

Specification of Letters Patent.

, Patented May 28,1912.

Application and January 23, 1912. Serial 11'... 672,899. j

To all whom it may concern:

Be it known that I, HERMan-N GX TNER. a subject of the German Emperor, and re-' siding at Lintorf, near Dusseldorf, Kingdom of Prussia, Germany, have invented certain new and useful Improvements in Annealing-Furnaces, of which the following is a specification. I a

The present invention relates .to an arrangement for annealing bright metallic articles .1n mdiiferent gases, the entrance and outlet openings being arranged below the filled annealing chamber or cooling down chamber respectively. The subject-invention differs from other known arrangements for this purpose by that at the outer ends of the annealing chamber and cooling down chamber arranged in .a straight line behind each other and closable against other by means of a damper, vertical shafts are provided, which can be closed below, and that in these shafts elevators are arranged, with which the charge to be annealed can be continuously introduced in large quantities and discharged respectively on trucks and the like fitting into the-annealing and cool ing down chamber.

In the accompanying drawing a constructional form of the furnace is exemplified, Figure 1 being a longitudinal section; .Fig. 2 is a transverse section alOng'lA-B-in Fig. 1 and Fig. 3 is a plan section along C-D in Fig. 1. Fig. 4 is an elevation of another constructional form of the charging device.

The furnace, which is fitted with a recuperator 1", consists essentially of a. horizontal shaft, which can be divided by a damper 8 into an annealing chamber 9 fitted with the annealing muffle m, and a cooling down chamber is respectively, and at its two ends two vertical shafts 'v and u respectively, in which elevators a and b are arranged for introducing and discharging the trucks w. Theseelevators have insulating tops (Z, for preventing the heat from penetrating downward into the elevator. These trucks w are provided at their ends with vertical walls 0 of refractory bricks, which will just fill out the width of the mufile so that when a truck is conveyed from. the annealing chamber, it will be impossible for all the hot gases to pass from the annealing chamber into the cooling chamber. The latter is free on all sides and is therefore well cooled by the air; besides it may be provided with a separate water cooling arrangement. In order to protect the vertical guides of elevator a against distortion 'by heat, which might interfere with the proper operation of the elevator, these guides at are .made'tubular so as to be cooled by water,

which may be supplied thereto in any suitable manner. The rods of the damper s and the elevators a, b are guided in known manner in sand cups 25 thereby affording tight joints. 1.

Into the upper part of elevator shaft 1) opens a pipe 0 for admitting an inert gas into the annealing'ch'amber, while a valve controlled burner pipe 29 is provided below the sole of said chamber, so that by lighting said burner the nature of the flame will indicate the character of the gas charge within the annealing chamber.

Through the'head wall of the shaft 0; is passed'in a stufiing box a rod f, which can be pushed by means of a driving device 2' into the shaft 2;, and will thereby push the trucks off the elevator into the annealing chamber. The elevator shaft M has on its walls a plurality of gutters Z, through which a continuous stream of cooling water flows and thus assists in cooling the cooling down chamber. The vertical shafts have in their lower part doors 6 and n for allowing of the trucks enteringand leaving the elevators.

These elevators may be operated either from above, preferably by means of hoisting gears attached to the roof-work of the building, or also from below by means of a. hydraulic lifting gear h, as shown in Fig. 4. i

The operation is as follows: After the annealing muflle and the extension mufile have been filled with an inert gas, which can be ascertained by means of the controlling flame lighted at the pipe p the truck laden with the material to be annealed is rolled through the opened door eon the elevator and the door is closed again. As soon as the elevator is raised by means of the hoisting or lifting gear the truck laden with the material will act as an insulation against. the heat rushing out. When the elevator, which is fitted with a striking gear operating at always the same level, has reached this level, the'truck is pushed by nealing process, for the heat not to escape into the cooling down mufile. After the ma: terial has been annealed the damper s is raised and the truck is pushed by the following trucks or the ejector into the cooling down mufiie; While the door 6 is being raised, the walls 0 of the trucks will prevent the heat from rushing into the cooling down muflie. After the truck has been moved into the cooling mufiie the damper is closed down again. From the cooling downmufile, the length of which depends likewise on the respective circumstances the truck is moved into the second elevator 12, being pushed onto the same by the following cars. A device may, however, also be provided by means of which the operator can draw the truck from the cooling down muffle on to the elevator by meansof a rod with a hook passed through a stuffing box into the interior. Windows with mica panes allow of an observation of the process within the mu-flie. After the elevator 6 charged with a truck w has arrived at its lower level, door n is opened and the truck ,-'is drawn out by hand. As the annealing mufitle is constantly under heat, the charge is very quickly in a glowing heat and can be rolled at any time into the cooling down mufiie, whether there is a fresh charge ready to be introduced or not. In the same manner material may be fetched out or introduced at any time. If for instance the annealing mufile is occupied, and the first truck is not yet thoroughly annealed, the freshly introduced truck can remain standing in the elevator after having been raised, and is preliminarily heated in this position.

As the introducing and removing of the trucks may be carried out at any moment bers filled with gas.

and these two operations are independent of each other one man will be sufiicient for operating the plant, so much the more, as the mechanical outfit is so designed, that the parts will automatically return into their initial position after the work has been completed.

The material is removed from the furnace in as bright a state as it was introduced into it, as it is entirely out of question for the heavy air below to rise into the higher cham- At the same time all draft is avoided, as the doors are opened alternately only and while the door is closed, will further serve as a tight closure. The arrangement may also be made that it is impossible to open the door while'the elevator is raised.

I claim:

In an annealing furnace of the character described, an annealing chamber, an adjacent horizontally alined cooling chamber, a damper intermediate said chambers, elevator shafts communicating with the outer ends of said chambers and extending downwardly therefrom, elevators reciprocable withinsaid shafts, and charge-receiving trucks adapted to travel through the annealing and cooling chambers, said trucks being provided with end walls that closely fit into the profile of the chambers, so as to separate the annealing chamber from the the elevator rising cooling chamber, while the damper is opened and while a truck is passed from the annealing chamber into the cooling chamber.

HERMANN GARTNER. [L. 5.]

Witnesses:

- CHAS. J. WRIGHT,

'HELEN NUFEB.

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