SU909518A1 - Roller-conveyer type electric furnace for bright annealing of elongated articles - Google Patents

Description

The invention relates to the design of electrothermal equipment; It can also be used in the metallurgical industry, for example, in roller conveyor furnaces for bright annealing of long products made of stainless steel, nonferrous metals and alloys.

A roller table electric furnace is known, comprising a loading chamber, a heating chamber, a cooling chamber and an unloading chamber 1.

The disadvantage of this design of the roller-type furnace is the impossibility of providing high quality heat treatment due to the absence of vacuum gateways at the beginning and end of the heat treatment process, which does not allow for more stringent requirements for a protective atmosphere.

Closest to the proposal is a roller-type electric furnace containing a loading vacuum gateway, a heating chamber and a discharge vacuum gateway with a fan and a gas pipeline 2 located therein.

The disadvantage of this design is that the cooling of the product does not provide an Effective cooling of the heated products.

The purpose of the invention is to increase the efficiency of cooling products.

This goal is achieved by the fact that the known electric roller-type furnace for bright annealing of long products containing a loading vacuum gateway, a heating chamber, a discharge vacuum gateway with a fan and a gas pipeline placed in It, is equipped with caissons located on the outer side surface of the discharge vacuum gateway. heat exchanger installed in its lower part.

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FIG. 1 schematically shows an electric furnace, a general view; in FIG. 2, node I in FIG. one; in fig. 3 shows section A-A in FIG. 2

Electric roller table contains

20 conveyor 1 loading, vacuum gas chute 2 from the loading side, heating chamber 3, vacuum gateway 4 from the unloading side and rolling table 5 unloading. Vacuum gateways 2 and 4 are made in the form of a cylindrical casing, the end projects of which are closed by vacuum valves 6. The heating chamber 3 has dampers.

Claims (2)

In the upper part of the gateway 4, a centrifugal fan 7 is installed, enclosed in a vacuum cap 8, and in its lower part - a heat exchanger 9 with a sealed cover 10 connected by a gas pipeline Not a fan Inside the vacuum interface 4 between the fan 7 and the heat exchanger 9 is installed driven roller table 12 with the possibility of longitudinal movement The outer side of the cylindrical surface of the vacuum gateway 4, while lying to the fan, is equipped with at least two cooling caissons 13. The electric furnace of the roller table is as follows . Before starting work, the electric furnaces of the product are loaded onto the roller table 1 and fed to the vacuum gateway where vacuuming takes place (pumping out atmospheric air into gateway 2 together with the product. Then nitrogen is fed to gateway 2 until the pressure of the controlled atmosphere of the heating chamber 3 is obtained. the exit gate of the vacuum sluice 2 and the inlet flap of the heating chamber 3 and the product moves into the heating chamber 3 where it is heated to the desired temperature. Then the exit damper of the heating chamber 3 and in One damper of the vacuum sluice 4 and the product moves to the vacuum lumen 4, in which the products are cooled, the flow of the controlled atmosphere after the fan, washing the side surface of the sluice, heats it, and the water circulating in the caisson cools this surface. The flow of the heated atmosphere is cooled in the heat exchanger. Thus, part of the heat of the flow of the atmosphere under control is absorbed by the caissons and the flow is already cooler. After the end of the unloading of products from Ilyuz 4, atmospheric air is pumped out, and then the gateway is filled with nitrogen to obtain the pressure of the controlled atmosphere of the heating chamber 3. The next batch is loaded after the first batch arrives from the vacuum gateway 2 into the heating chamber 3. The use of the proposed construction makes it possible to more efficiently cool the flow of the controlled atmosphere as it leaves the fan. As a result, more efficient cooling is achieved. Claims of the invention A roller-type electric furnace for bright annealing of lengthy products containing a vacuum 11SHOOS vacuum chamber, a heating chamber and a vacuum discharge gateway with a fan and a gas pipeline in it, equipped with a cooling duct and equipped with a chassis, installed in order to increase the cooling efficiency of the products. bo- the surface of the discharge vacuum gateway, and the heat exchanger located in its lower part. Sources of information taken into account in the examination 1. Electrothermal equipment. Directory. Under. Red A.P. Althausen. M., Energie, 1967, p. 176. 2. Leykavd MS; Vacuum electric furnaces. M., Energie, 1968, p. 194-195.