SU453242A1 - - Google Patents

Description

one

The invention relates to the field of powder metallurgy, in particular to furnaces for the production of powders of refractory materials.

A well-known kiln for the production of high-temperature powder materials, consisting of a rotary tube, a tube, a heater, a metering device, a feeder for the charge, a discharger with windows for unloading the product and a refrigerator. In this case, the pipe is made of heat-resistant material and is uncooled.

The proposed furnace differs from that known in order to increase productivity and reliability in operation, the rotating tube is made of series-connected sections heated-and cooled, and the heated section is cantilevered in a cooled section located on supports.

The drawing shows the proposed tsek.

The furnace consists of a heated pipe 1 connected in series with the cooled section 2. The pipe 1 is made of heat-resistant material, such as graphite, and section 2 is made of steel. The pipe with the additional section is fixed on the roller support 3 and in the sliding bearing 4. Support 3 comprises a band 5 and roller 6. The pipe is driven from the sprocket 7 connected by a chain with a drive 8 located on the frame 9. The frame 9 has the ability installation at an angle of up to 10 ° in the direction of product alignment due to rotation on the hinge 10 with screws 11. Powder mixture is fed into the pipe using a drum metering device 12 and a screw feeder 13, which is sealed in the furnace body 14 with a stuffing box 15 and 3 pipe 1 with ring vym clearance. In the housing there is a lining 16 of refractory charge, for example boron nitride or zirconium dioxide, and a muffle 17 of zirconia. As a heating device 18, any of the known heaters can be used.

On the inner surface of the pipe 1 and section 2 there are spiral grooves (not marked in the drawing). Section 2 is sealed at the point of entry into the liner 16 by means of a gland 19. Pre-assignment bin 20 for unloading the product through the windows 21 and feeding it to the exhausters 22.

The cooled section 2 is welded and consists of an inner pipe 23. a water jacket 24 and a welded pipe 25, connected by channels for supplying and discharging water through sleeve 26. In the sleeve there are cavities sealed with rubber rings 27. Pipe 1 is cantilevered into the cooled section and connected to it with the help of flats and fixed key 28, which is placed in the cross section on the wall of section 2. The key is sealed by a gasket and retained with the iioMOHUi screw (the pin and pad of the drawing are not shown).

The furnace works in the following way.

The charge in the form of poron1 or granules is supplied by the dispenser 12 and the additional feeder 13 to the heating pipe 1. Inclination of the furnace and spiraling viyutri tpy6i, i spirals facilitate the movement of the product with thermotherapeutic processes. After that, the product enters the cooled section 2, through which it moves to the windows 21, where it is unloaded. Further cooling of the product occurs in the bupker 20, from where the product enters the container or the processing line with the help of chuck 22.

Before starting work, the inner space of the nets is filled with an inert gas or vacuum.

four

The furnace is designed to operate at temperatures from 1200 to 2500 ° C and can be used both in flow-through automated lines and in the production of pilot batches of high-temperature powders.

Subject invention

A furnace for powder and high-temperature powdered materials containing an anti-ribbed pipe, an heater, a dosing device, and a niteleg. for the charge, the discharge device and the refrigerating device, characterized in that, in order to improve performance and reliability in operation, the rotating pipe is made of series-connected sections - heated and cooled, with the heated section cantilevered in the cooled section located on the supports.

-13 28 S 23 6 22 f / 7, 8 2526 27