PL189455B1 - Vacuum-type heat-treatment furnace - Google Patents

Abstract

The vacuum furnace for thermal processing has a cylindrical chamber equipped with gas flow nozzles. The nozzle openings are closed with sealing plugs, mounted with articulated joints on axles. The latter rotate on bearings mounted in circumferential reinforcements of the heating chamber structure. It is characterised in that a ring (3) is fixed to the circumferential reinforcements (1) in the heating chamber structure (2), so that it can rotate. The ring has toothed racks (4) on its side surface, near the axes of gas flow nozzles (5). The number of toothed racks corresponds to the number of nozzles (5). The racks are in gear with the toothed wheels (6) joined to the plugs (7). The ring (3) rotates by the angle &alpha that is indispensable to close or open the nozzles (5).

Description

The subject of the invention is a vacuum furnace for heat treatment, in particular with convection-vacuum heating of tool steel products. It is also possible to carry out annealing, brazing and heat treatment processes for steel products and its alloys.

There are known furnaces that enable heat treatment with combined convection-vacuum heating. One of such solutions is described in "Harterei - Technische Mitteilungen" No. 5 of 1987 on pages 244 and 248. The furnace described therein, with a rectangular heating chamber and a one-way or two-way flow of cooling gas during cooling, has a fan forcing the circulation of inert gas in during the convective heating of the load. A similar solution of a furnace with convection-vacuum heating is known from the Polish patent No. 156 092, where the charge was placed in a rectangular heating chamber adapted to cool the charge from both sides. A slightly different problem of combining both heating possibilities is presented in "Harterei - Technische Mitteilungen" No. 519 (1996) 2 on page 127, where the cooling gas cools the charge from three sides. Charge cooling, in a rectangular chamber, with gas flowing from four sides, was designed in the solution described in Polish patent No. 166,232.

In the solution described in the German patent No. 3 736 501, the convection-vacuum heating furnace has a cylindrical chamber in which the charge is cooled with gas flowing from four sides, evenly around the circumference of the chamber.

Also known is the solution described in patent 179 906, in which a vacuum furnace for heat treatment having a cylindrical chamber is equipped with gas flow nozzles with closing the nozzle openings with sealing plugs articulated on the axles. These axes are mounted and bearing on the circumferential reinforcements of the heating chamber structure.

The vacuum heat treatment furnace having a cylindrical chamber equipped with heating elements and gas flow nozzles and sealing plugs closing the nozzle openings has a ring rotatably attached to the circumferential reinforcements of the heating chamber structure. On its side surface, this ring has gears arranged in such a way that they are located next to the axis of the gas flow nozzle and in an equal number of nozzles. Each of the racks cooperates with a toothed wheel connected with a plug allowing for tight closing of the nozzle opening.

The ring is rotated by the angle α necessary to close or open the gas flow nozzles by a known drive.

This design is simple and easy to operate, allowing the cooling gas flow to be controlled.

The vacuum furnace for heat treatment in the exemplary embodiment is shown in the attached drawing, in which Fig. 1 shows a cross-section of the chamber and Fig. 2 shows a detail showing the connection of the rack with the gear and the plug of the gas flow nozzle.

189 455

In an exemplary embodiment, the vacuum furnace for heat treatment has a ring 3 attached to the circumferential reinforcements 1 of the structure 2 of the heating chamber. The ring 3 has, on the side side, racks 4 mounted so that they are located next to the axis of the gas flow nozzles 5. Each of the racks 4 cooperates with a toothed wheel 6, to which a plug 7 is attached to seal the opening of the nozzle 5.

The ring 3 is set in motion by a known drive 8 rotating it through an angle of 60 ° necessary to seal or open the opening of the nozzle 5.

fig 2

189 455

fig 1

Publishing Department of the UP RP. Circulation of 50 copies. Price PLN 2.00.

Claims (1)

Patent claim A heat treatment furnace, having a cylindrical chamber equipped with gas flow nozzles with closing the nozzle openings with sealing plugs articulated on the axes, which are mounted and bearing on the circumferential reinforcements of the heating chamber structure, characterized in that it is rotatably attached to the heating chamber structure (2) to its circumferential reinforcements (1) a ring (3) having on the side surface of the racks (4) arranged next to the nozzle axis (5) for gas flow and in the number of equal number of nozzles (5), cooperating with toothed wheels (6) connected with plugs (7) , wherein the ring (3) is rotated by the angle α necessary to close or open the nozzles (5).