SU979821A1 - Electric resistance furnace with suspended conveyer - Google Patents

Description

The invention relates to a device for heat treatment of materials and can be used in the manufacture of ceramics, in mechanical engineering and other industries for heat treatment of materials in a controlled atmosphere.

Known designs of pusher furnaces with controlled atmosphere. For example, for sintering pellets made of ceramic material, fuel rods in a reducing medium, a horizontal tube furnace with heaters along the chamber and with a hearth for moving boats is used. In the furnace, lock devices, systems for supplying reducing gas, and removal of products of ligament burning [1] are provided.

The disadvantages of pusher type furnaces are a large temperature difference in the working area, poor washing of the tablets with reducing gas and, therefore, the lack of stability of properties, quality of the products obtained and low productivity.

The closest in technical essence And the achieved result is a resistance electric furnace with an overhead conveyor containing (a heating chamber with a longitudinal vaulted slot ·, pendants with cradles, thermal * air pipes for supplying air into the chamber located at the inlet and outlet of the furnace. Such furnaces have devices for loading and unloading products and are most often used for firing enamel coatings in an oxidizing atmosphere (2]. <

²⁰ The main disadvantage of this furnace is the difficulty in creating a protective or controlled atmosphere due to the presence of a vault and openings at the loading and unloading sides.

The aim of the invention is to ensure the operation of the furnace in a controlled atmosphere jf. This goal is achieved by the fact that in an electric resistance furnace with an overhead conveyor containing a heating chamber with a longitudinal vault, pendants with cradles, pipes for gas supply to the chamber located at the inlet and outlet, the sealing of the vault gap is made of mating V-shaped elements from an elastic material, covering a pendant, which is equipped with screens. .

property 23, in which it is removed from the suspensions 9 by the mechanism 26, and through the camera 24 is brought out. The seal 12 of the vault slot from overheating by radiation is protected by screens 15, which slide along the rails 16 and recline, hinged when the direction of movement changes when turning the conveyor

Thus, the presence of gateway lips * in FIG. 3 in FIG. 4 heating on 25

Claims (2)

At the entrance and exit of the furnace are made lock devices. FIG. 1 shows a furnace, general view, longitudinal section; in fig. 2 section A-A in FIG. 1; in FIG. 3 section bb in fig. one; in fig. 4 node G in FIG. 3. The furnace has a heating chamber 1 including a steel hermetic casing 2, a heat insulating lining 3f 4, resistance metal heaters 5 located on the side walls b and bottom 7, a suspension conveyor 8 with suspensions 9 is installed in the furnace for transporting the material for cradles 10. Suspension brackets 9 pass through a roof opening 11 which has a seal .12, made of two V-shaped elastic members 13 of kaolin felt, covering the suspensions 9 with each other and mounted on brackets 14. The seal The bottom 12 is protected by screens 15 pivotally mounted on hangers 9 and sliding along rails 16 mounted on a metal substrate 17. At the entrance of the furnace there is a lock device 18 including chambers 19 and 20 and mechanisms 21 22 for moving and hanging the cradles 10 9, at the exit, a lock device 23 with chambers 24 and 25 and a mechanism 26 for removing cradles from the conveyor. In addition, pipes 27 and 28 are installed on both sides of the chamber, into which cold gas is fed from the controlled atmosphere of the furnace, and a refrigerator 29 is additionally installed at the outlet of the furnace. The device works as follows. In the cradle 10, the processed material is loaded outside the furnace and fed into the chamber 19 of the sluice device 18. With the entrance of the chamber 19 closed, the cradles 10 are moved by means of the mechanism 21 and the chamber 20, in which the suspension mechanism 9 is suspended by the mechanism 22. with the material is moved along chamber 1, where the heat treatment is performed and, at the end of the treatment, the treatments are placed in the refrigerator 29 of the furnace. The cooled material in the cradles from the refrigerator moves into the chamber 25 of the sluice device 23, which is removed from the suspensions 9 by the mechanism 26, and is brought out through the camara 24. The archway seal 12 is protected from overheating by radiation by screens 15, which slide along the rails 16 and fold out with hinges when changing the direction of motion at the turns of the conveyor. Thus, the presence of sluice devices at the entrance and exit of the furnace and compaction in the archway ensures the furnace operation in the required atmosphere, the design of the seal, namely, the implementation of the seal in the form of mating V-shaped elements of kaolin felt, provides movement of the suspensions along the camara and prevents gas leakage controls furnace environment. The design of the furnace is easy to manufacture, provides high performance required in mass production, for example, ceramic products. 1. Electric resistance furnace with an overhead conveyor containing a heating chamber with a longitudinal arch: rip hole, suspension with cradles, nozzles for gas supply to the chamber, located at the inlet and outlet, characterized in that the atmosphere, the seal of the ceiling slit is made of matching hex x L-shaped elements of elastic material, covering the suspension, which is equipped with screens. 2. Electric furnace according to claim 1, about 1 ton and so that the gateway devices are made at the entrance and exit of the furnace. Sources of information taken into account in the examination 1. German patent W 2039212, cl. 31 a 19/04, publ. 1972. 2. Manevich A.M. Resistance furnaces with overhead conveyor. Scientific and technical collection Electrotherms. Issue 38, M., VNIIEM, 1964, p. 12-14. v // GW) Z4 LL tr fS