RU210680U1 - ELECTRIC ROLLING FURNACE FOR HOLIDAYING SPRING TERMINALS OF RAIL FASTENERS - Google Patents

Abstract

The utility model relates to a rotary electric furnace for tempering spring terminals of rail fasteners. The rotary electric furnace contains a welded body, a vault, an annular heating chamber made integral with the hearth, a hatch for loading and unloading, guide screens, an annular groove is made in the hearth, for introducing driving rods placed on the annular electric drive under the hearth of the furnace, four windows are made in the vault , located evenly around the circumference, covered with heat-shielding covers, in which heating blocks are mounted, guide screens separating the heating blocks from the annular chamber, driving rods are connected in the heating chamber to each other by an annular suspension made in the form of a plate, in the upper part of which grooves are made with a pitch providing an air gap between the terminals. EFFECT: improved quality of heat treatment of products due to faster uniform heating of each terminal and more accurate maintenance of the set temperature. 4 ill.

Description

The utility model relates to the field of mechanical engineering and can be used for tempering spring terminals of rail fasteners and other similar products.

Known rotary electric furnace containing an annular heating chamber with a movable hearth mounted on a platform with a rotation drive (ac. No. 658386, class F27B 13/06, 9/16 "rotary electric furnace" authors Shterman S. M. and others, RU, 1979).

Also known is a rotary furnace for use in ferrous metallurgy, which has a ring-shaped plan and is closed from below by a rotating hearth (patent RU 2293269 C2, class F27B 9/16, B65G 29/00, C21C 5/52, ... "Carousel furnace used in the iron and steel industry” by BONCI Paolo (IT) and Facco Giuseppe (US), 2002).

The disadvantage of these rotary electric furnaces are significant heat losses through the movable joint of the rotating hearth and the annular heating chamber.

Also known is an annular conveyor electric furnace "PRETTI" containing a metal welded frame, an annular heating chamber made integral with the hearth, electric heaters on the side walls of the chamber, in the central part of the hearth an annular groove is made for entering the driving rods connected to the electric drive into the heating chamber (patent No. 2131569 C1, class F27B 13/00, 9/16, authors V. A. Petrov and A. B. Petrov, RU, 1999).

The disadvantage of such furnaces is the difficulty of replacing the electric heating elements when they fail and, accordingly, a decrease in the overall productivity of the furnace.

Closest to the proposed utility model, taken as a prototype, is a rotary electric furnace for tempering spring terminals of rail fasteners, containing a welded body, a roof, an annular heating chamber made integral with the hearth, a hatch for loading and unloading, guide screens, an annular groove is made in the hearth , for inserting drive rods placed on a ring electric drive under the furnace bottom and connected in the heating chamber to each other by an annular plate for installing spring terminals, four windows are made in the roof, spaced evenly around the circumference of the roof, closed with heat-shielding covers, in which heating blocks are mounted (patent No. 114136 F27B 9/16, authors Ivanov A.V., Mishunin V.M. et al., 2011).

The disadvantage of such furnaces is the decrease in the quality of heat treatment of spring terminals, due to the uneven heat flow in each of the four heating zones and the density of loading terminals on the annular plate.

The technical result (purpose) of the utility model is to improve the quality of heat treatment of products.

The technical result is achieved by the fact that the rotary electric furnace contains a welded body, a roof, an annular heating chamber made integral with the hearth, a hatch for loading and unloading, guide screens, an annular groove is made in the hearth for inserting driving rods placed on the annular electric drive under the hearth of the furnace , four windows are made in the vault, evenly spaced around the circumference, closed with heat-shielding covers, in which heating blocks are mounted, guide screens in four heating zones have a special shape of a truncated rhombus, and driving rods are connected in the heating chamber to each other by an annular suspension, made in the form of one or two plates, in the upper part of which grooves are made with a pitch that provides an air gap between the terminals.

In FIG. 1 shows a rotary electric furnace (transverse vertical section); in fig. 2 - rotary electric furnace top view; in fig. 3 - a fragment of one (out of four) furnace heating zone and a guide screen; in fig. 4 - types of suspensions with installed spring terminals.

The rotary electric furnace contains a welded body 1, an annular heating chamber 2, made integral with the hearth 3, a hatch for loading and unloading 4, a vault 5 with four windows 6, four heating blocks 7, an annular groove 8, driving rods 9, an annular electric drive 10, heat-shielding removable covers 11. Heating blocks 7 consist of electric heaters 12 and fans 13, mounted on covers 11 and placed in chamber 14. Chamber 14 is divided by a horizontal partition 15 and separated from the annular chamber 2 by a vertical guide screen 16. Power is supplied to the electric heaters through rods passing through through removable covers 11.

The driving rods 9 are fixed on the annular electric drive 10 under the hearth of the furnace 3. The spring terminals 17 are located on the annular suspension 18, which connects the driving rods 9. The annular suspension is made in the form of one or two plates, in the upper part of which grooves are made with a pitch equal to 1.5-2.0 diameter of the bar from which the terminals are made.

To protect against leakage of hot air into the atmosphere, the annular groove 11 is closed with a sand seal 19.

Rotary furnace works as follows.

With the help of heating blocks 7 in the annular heating chamber 2, a stream of hot air is created, directed from top to bottom. Spring terminals 17 are heated by convection to the temperature set by the technical process, which is maintained constant in four heating zones. Through the loading and unloading hatch 4, spring terminals 17 are installed in the grooves of the annular suspension 18. Using the annular electric drive 10, the driving rods 9 are rotated together with the annular suspension 18 and the spring terminals 20. After passing a full circle, the spring terminals enter the loading and unloading hatch 4 s the other side and removed from the electric furnace.

The essence of the proposed method is as follows.

The guiding screen separating the heating block from the annular chamber ensures, due to the geometry (truncated rhombus), the uniform distribution of hot air along the length of the annular chamber in each zone. Placing the spring terminals on a ring suspension with the specified air gap between them guarantees good transparency for the flow of hot air washing around each terminal. These measures provide faster uniform heating of each terminal and more accurate maintenance of the set temperature, which improves the quality of heat treatment of products.

Claims (1)

Rotary electric furnace for dispensing spring terminals of rail fasteners, containing a welded body, a roof, an annular heating chamber made integral with the hearth, a hatch for loading and unloading, guide screens, while in the hearth there is an annular groove for inserting driving rods placed on the annular electric drive under furnace bottom, in the vault there are four windows, evenly spaced around the circumference, closed with heat-shielding covers, in which heating blocks are mounted, characterized in that the guide screens in the four heating zones have the shape of a truncated rhombus, and the driving rods are connected in the heating chamber to each other by an annular suspension , made in the form of a plate, in the upper part of which grooves are made with a pitch that provides an air gap between the terminals.

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