SU579326A1 - Vacuum electric furnace - Google Patents

Description

one

The invention relates to electrothermal equipment. For heat treatment of non-ferrous and refractory metals; alloys, in particular pipes, profiles and rods in vacuum or inert gas environment. It can be used in the metallurgical, engineering, aviation and other industries of the country.

Horizontal heat transfer furnaces ij are widely used for heat treatment of long-length parts.

A vacuum electric furnace is known; it consists of muffles and a heating chamber, in which stationary muffles mounted on one axis one against the other, and the heating chamber, i5 located on the same axis as the muffles, first runs over one muffle and then on the other. The disadvantage of this design is the low productivity of 2J.

An electric furnace is also known, in which 20 vacuum muffles (more than two) are installed parallel to each other, and the heating chamber is stirred along the front of the muffles.

However, when such furnaces operate, large heat losses are observed through the shell in S?

there is no furnace and it is not possible to increase the working temperature in the muffle, because of the absence of vacuum in the heating chamber.

These drawbacks are eliminated in a vacuum electric furnace, in which the shell is removed, and the supporting device for the muffle is made in the form of tipping racks. The electric furnace consists of a movable heating chamber, stationary muffles and supporting devices made in the form of racks with the possibility; tipping over

The disadvantage is the need to install a large number of massive racks to hold the muffle and eliminate its deformation in a hot condition. The device for tipping the racks often

goes out of order, which leads to the DUTY of the furnace simply caused by the repair or replacement of devices, except for the massive support device that prevents the heating and cooling of the products from being evenly dimensioned.

In order to increase the reliability of the furnace, operation and to ensure uniform heating, supporting ycTpoficTBO mssfelr: expelled in the form of support carriages, placed

on a platform that can be reciprocated, and the platform is equipped with an automatic machine that is wii. connection to the heating chamber.

FIG. 1 shows the proposed furnace during heating of the product, general view; Fig 2 is the same during product cooling; in fig. 3 - section A-A of FIG. one; in fig. 4 is a sectional view of FIG. one.

The electric furnace contains a movable heating chamber 1, which strikes the muffle 2 located on the movable platform 3; which is connected by an automatic coupling 4 with a heating chamber. The heating chamber with a movable platform moves along rails 5, and the muffle mounted on a row of support carts 6 moves along the heating chamber and the movable platform along rails 7, the muffle is loaded and unloaded using a loading mechanism 8. The heating chamber is mixed along the muffle front using trolley 9.

The furnace works as follows

The products are placed on the pallet of the loading mechanism 8, then the pallet moves the pallet into the muffle 2. The muffle creates the required vacuum, after which the heating chamber 1, moving along the rails 5, hits the muffle 2. The movable platform 3 moves with the heating chamber and is installed under the loading mechanism 8. After heating and holding the products, the heating chamber, moving down from the muffle, rolls out the moving platform from under the loading mechanism, and support the trolley 6 muffle 2, moving along the 7 itself, located inside the heating chamber and, alternately slide onto platform 3. The heating chamber is disconnected from the mobile platform by means of an auto-acceptor, and the muffle remains on the platform for cooling. The heating chamber is then moved along the front of the muffles on the trolley 9 and

stops against the next muffle, etc.

At the end of the heating of the last coupling, the cooling, unloading and loading of the first muffle is completed and the cycle is repeated with.

Replacing the tipping racks with the platform allows:

to increase the cooling rate and the uniformity of heating and cooling of the products, which, in turn, reduces the waste after heat treatment by 95%;

five times increase the reliability of the design;

increase the capacity of the electric furnace by installing up to 4-5 muffles in one chamber, instead of one on a sheshtuk oven.

invention formula

E is an electric furnace containing a muffle mounted on the support of the device and having a heating chamber that can be moved, I differ from the fact that, in order to ensure uniform heating and increase the reliability of the furnace in operation, the muffle device is designed as supporting carts placed on a platform having the possibility of reciprocating mixing, and the platform is equipped with an automatic coupling for connection with the heating chamber.

Sources of information taken in BTIH-manie during examination:

1. Leikand MS. Vacuum electric furnaces, M., 1968, p. 2O6-2O8.

2. USSR author's certificate Ms 253843, С 21D9 / 00. 1968.

3. USSR author's certificate No. 398650, C 21D9 / OO.

"VJ

"

 f (

Fig.Z

7, 3

l

f

Fig