SU68588A1 - Steel Products Hardening Furnace - Google Patents

Description

Furnaces for the hardening of steel products: With the pushing of the latter into the quenching bath and with the ejection of part of the exhaust gases in the nozzles are known.

In the proposed furnace for hardening steel products, in contrast to existing furnaces, a common ejector chamber is located at the nozzles and connected to the longitudinal gas collector by transverse channels.

FIG. 1, 2 show longitudinal and transverse sections of the furnace for hardening steel products; FIG. 3 - section of the furnace in plan, in FIG. 4 shows the arrangement of channels in the furnace and in FIG. 5 - laying of heated products in the furnace.

The furnace of the working chamber / (Fig. 1) with side furnaces 2 located along one side thereof. The fireboxes 2 (Fig. 2) are separated from the working chamber 7 by a transsal wall 3 connected by jumpers to the main wall of the chamber.

Columns 4, forming together with the wall of the furnace :; transverse channels 5 (Fig. 5), covered with supports b. The transverse channels 5 connect the ejector chambers 77 at the nozzles 16 (Fig. 3) with a longitudinal gas collector 7. On the front side of the chamber, in front of the loading door 14, a pneumatic pusher 8 is installed (Fig. 1), on the table of which round heat-resistant guides 9 are placed passing through the loading threshold into the cavity of the furnace together with the seats 13 (Fig. 5) and the products loaded on them. On the opposite side of the chamber there is a discharge port, which is covered by a shield 10 of a two-layer sheet. To the loading window inside the furnace, it connects the unloading chute 77 with a slope to the quenching bath embedded in the floor. In the wall above the discharge window there are two windows 72 for monitoring the burning.

The articles to be quenched are laid on the saddles in several rows in height, and the stacks are fed by the pusher 8 to the charging door 14 of the furnace. Then, the pusher 8 is retracted to its original position and a frame welded from the pipes is laid between it and the stack of products. At the moment of the next protalka61

Wahn the keeper switches on the lift (compressed air line valve) and opens the loading door 1-1. An unloading shield 10, which is installed when the elevator is turned on parallel to the discharge chute 7 /, is interlocked with this elevator. The pusher 8 advances with the help of the frame the last stack to the set in the chamber /, and then for the remaining part of the stroke moves the entire set to the furnace, to the quenching bath. Thus, the first in the course of the set, the stack, coming out of the guides 9, on an inclined discharge chute 7 7 with the open shield 10 falls into a quenching bath. At this time, the pusher 8 performs a return stroke, and by turning off the elevator the loading door 14 under the action of its weight is lowered into the lower position, the shield 10 with the help of the counterweight takes up again the vertical position, closing the discharge window.

On the table of the pusher 5, the next laying of products is performed, and in the chamber 7 at this time the heating and holding of the loaded products is performed until the next period of pushing.

Kiln in the furnace occupies almost a central position. Two rotations of the flame from nozzle 7 (5 to the metal allows complete completion of the combustion reaction. Only after this, the combustion products of the fuel, washing the cage, are lowered into the transverse channels 5 of the furnace and are assembled in longitudinal Mg %%

gas collectors 7, and from there about the vertical channels 75 (Fig. 3) approach the nozzles 16 diffusers and eject into the cavity of the working chamber 7 through the furnaces 2.

The transverse channels 5 (Fig. 4), only from the third to the eighth, inclusively, are connected to the ejector chambers 77 at the nozzles 16. Of these, the combustion products enter the furnaces 2 and dilute the combustible mixture from the nozzles to create a uniform temperature field. The last or ninth transverse channel has the purpose to prevent water vapor from the quenching bath and outside air, which can contribute to an increase in oxidation, into the working chamber 7 when the door 14 and shield 10 are open during the next pushing of the charge to the heated metal.

The first two transverse channels are reduced to the left corner chimney and are intended for the main exhaust of the combustion products from the furnace.

Subject invention

A furnace for the hardening of steel products with periodic pushing. In quenching them then a bath and with ejection of part of the exhaust gases in the nozzles, characterized in that the common ejector chamber located at the nozzles is connected to the longitudinal gas collector through the transverse channels.

FIG. one

FIG. 2

FIG. 3

FIG. four

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FIG. five