RU161187U1 - RING HEATING ROLLER FOR ROLLING ROLLERS FOR HARDENING - Google Patents

Abstract

1. An annular inductor for heating the rolling rolls for quenching, containing located between the upper and lower plates of the coil winding with a C-shaped magnetic circuits, powered by a current of industrial frequency, characterized in that under the bottom plate it contains an additional coil of the coil with a C-shaped magnetic circuits, fed high frequency current of 500 Hz, which is located between the additional upper and lower plates, both windings of coils that are made of a copper tube of rectangular cross section and equipped with terminals at the ends for supplying current and nipples for supplying and discharging cooling water, they are equipped with clamps for their position in the radial and vertical directions, while the coil winding, powered by a current of industrial frequency, is multilayer, and the coil winding, fed by an increased frequency current of 500 Hz, is made single-layer. 2 . The ring inductor according to claim 1, characterized in that the turns of the coil windings are made isolated from each other and parallel to the upper and lower plates of the inductor. The ring inductor according to claim 1, characterized in that the lower plate and the additional upper plate are connected by bushings. The ring inductor according to claim 1, characterized in that the clamps of the coil windings in the radial direction include racks located between the lower and upper plates opposite the winding and isolated from them, and the racks are provided in the center with threaded holes or welded nuts for passage of pressure bolts pressing on bars made of dielectric placed on the lateral outer surface of the fixed winding. 5. The ring inductor according to claim 1, characterized in that the latches of the coil windings in the vertical direction include p

Description

RING HEATING ROLLER FOR ROLLING ROLLERS FOR HARDENING

The utility model relates to heat treatment, in particular, to ring inducers for heating large-sized rolls of rolling mills for quenching, and can find application in mechanical engineering.

A device is known for induction heating of rolling rolls for hardening, including three ring inductors placed one below the other, fed by currents of different frequencies, the distance between the upper inductor and the second inductor located below being 10-15 mm, and between the second inductor and the third inductor located even lower - 75-100 mm. The height of the ring inductors was 150-200 mm, the diameter of 500-600 mm. Before induction heating, the rolls are preheated in an oven to a temperature of 250-350 ° C.

(CN 203 846072, C21D 1/10, C21D 9/38, published 09.24.2014)

The disadvantages of the known device, which is described schematically, is the impossibility of its use for induction heating for quenching of large rolls with a diameter of 700 to 1600 mm and a mass of 20-60 tons, since in order to ensure the required speed and temperature of heating the roll, there must be a specific design solution of the ring inductor.

The closest in technical essence is a device for induction heating, including a frame enclosed between the upper and lower flanges in the form of plates, a coil of an inductor with electrical leads wound around the frame, equipped with C-shaped magnetic circuits, which are pulled together by guiding brackets.

(RU 2091987, C21D 9/00, published 09/27/1997)

The disadvantages of the known device is the inability to use it for induction heating for quenching of large-sized rolls with a diameter of 700 to 1600 mm and a mass of 20-60 tons, since the known design cannot provide the required heating speeds and temperatures and at the same time maintain operability for a long time.

The objective and technical result of the utility model is to increase the rate at which the required heating temperatures for the surface of large rolls are achieved, increase the depth of heating of the rolls, and reduce energy losses during heating.

The technical result is achieved by the fact that the annular inductor for heating the rolling rolls for quenching includes a coil winding located between the upper and lower plates with a C-shaped magnetic circuits, powered by a current of industrial frequency, and under the lower plate contains an additional coil winding with a C-shaped magnetic circuits, fed by an increased current frequency of 500 Hz, which is located between the additional upper and lower plates, both windings of coils that are made of a copper tube of rectangular cross section and are equipped with and at the ends with terminals for supplying current and fittings for supplying and discharging cooling water, and also equipped with clamps for their position in the radial and vertical directions, while the coil winding, powered by a current of industrial frequency, is multilayer, and the coil winding, fed by a current of increased frequency of 500 Hz made single layer.

The technical result is also achieved by the fact that the turns of the coil windings are made isolated from each other and parallel to the upper and lower plates of the inductor; the bottom plate and the additional top plate are connected by bushings; the latches of the coil windings in the radial direction include racks located between the lower and upper plates opposite the winding and isolated from them, and provided with threaded holes or welded nuts in the center for the passage of clamping bolts pressing on the dielectric bars placed on the lateral outer surface of the fixed winding; the latches of the coil windings in the vertical direction include threaded holes or welded nuts placed on the upper and / or lower plates for the passage of pressure bolts pressing on the bars of the dielectric placed on the upper and / or lower surface of the fixed winding; nipples for supplying and draining cooling water are connected by hoses to the inlet and outlet manifolds of the circulating water system located on an additional bottom plate; C-shaped magnetic cores are made of prefabricated 90-120 mm thick from sheets of electrical steel 0.35 mm thick; the outermost sheets of prefabricated magnetic circuits are equipped with tabs, which are bolted to the upper and lower plates of the inductor.

The utility model may be illustrated by examples using FIG. 1-4, where:

1 - additional bottom plate;

2 - additional winding of the coil, fed by a current of increased frequency of 500 Hz;

3 - C-shaped magnetic cores;

4 - a rack of a clamp;

5 - additional top plate;

6 - a nut;

7 - clamping bolt;

8 - terminal;

9 - fitting;

10 - input manifold of the circulating water system;

11 - coil winding, powered by a current of industrial frequency;

12 - the top plate of the coil, powered by a current of industrial frequency;

13 - the bottom plate of the coil, powered by a current of industrial frequency;

14 - sleeve.

When preparing an annular heating inductor for heating rolls with a diameter of 180-1600 mm for quenching according to a utility model, an additional winding 2 of the inductor coil with C-shaped magnetic circuits 3, powered by an increased frequency current, is installed on the upper surface of the additional lower plate 1 along the perimeter of the central hole.

The coil winding 2 (Fig. 2, 3) is made of a single-layer rectangular copper tube and is provided at the ends with terminals for supplying current and fittings for supplying and draining cooling water. The turns of the coil winding 2 are made isolated from each other and parallel to the upper and lower boards of the inductor.

The magnetic cores of 3 C-shaped are made of prefabricated 90-120 mm thick sheets of electrical steel 0.35 mm thick, while the outermost sheets of prefabricated magnetic cores are equipped with tabs that are bolted to the upper and lower plates of the inductor (not shown). This ensures a rigid fixation of both the magnetic cores and the turns of the coil winding, which reduces electrical losses during operation of the inductor. The use of an additional coil 2, powered by an increased frequency current, provides a higher speed of heating the roll to the desired temperature, a greater depth of heating and, as a result, higher quality of the subsequent quenching of the roll.

On the upper additional plate 5, a winding 11 of the inductor coil with C-shaped magnetic circuits 3, fed by an industrial frequency current, is placed around the perimeter of the central hole. The coil 11 is also placed between the upper 12 and lower plates 13 provided with central holes. In this case, the lower plate 13 and the additional upper plate 5 are connected by bushings 14.

The design solution of the coil unit of the inductor fed by the industrial frequency current (50 Hz) is similar to the design solution of the inductor coil fed by the current of high frequency (500 Hz). The difference lies in the fact that the winding of the coil 11, powered by a current of industrial frequency, is multilayer. In this case, the winding of the coil 11 can be made integral of several coils placed one above the other and connected electrically in series (Fig. 4). In this case, the gaps between the turns of different windings are filled with a dielectric.

To further reduce electrical losses and increase the durability of the coil windings are equipped with clamps for their position in the radial and vertical directions. The clamps of the coil windings in the radial direction include racks 4 mounted on the lower plates 1 and 13. Racks 4 connect the lower 1, 13 and upper 5, 12 plates, isolated from them and placed opposite the windings 2, 11. Threaded holes are made in the centers of the racks 4 (or nuts 6 are welded) for the passage of clamping bolts 7, pressing on the bars of dielectric 8, placed on the lateral outer surface of the fixed windings 2, 11. The latches of the coil windings in the vertical direction also include threaded holes or welded nuts 6 ', placed on the 5, 12 and / or lower plates 1, 13 for passage of clamping bolts 7 ', pressing on the bars of the dielectric, placed on the upper and / or lower surfaces of the fixed windings 2.

The fitting 9 for supplying and discharging cooling water to the windings 2, 11 is connected by hoses (not shown) to the input 10 and output (not shown) collectors of the circulating water system, located on the additional bottom plate 1.

The constructive solution of the annular inductor for heating the rolling rolls for quenching according to a utility model ensures the achievement of the set technical result: an increase in the rate of achievement of the required heating temperatures for the surface of large rolls, an increase in the depth of heating of the rolls, and a reduction in energy losses during heating.

Claims (8)

1. An annular inductor for heating the rolling rolls for quenching, containing located between the upper and lower plates of the coil winding with a C-shaped magnetic circuits, powered by a current of industrial frequency, characterized in that under the bottom plate it contains an additional coil of the coil with a C-shaped magnetic circuits, fed high frequency current of 500 Hz, which is located between the additional upper and lower plates, both windings of coils that are made of a copper tube of rectangular cross section and equipped with terminals at the ends for supplying current and nipples for supplying and discharging cooling water, they are equipped with clamps for their position in the radial and vertical directions, while the coil winding, powered by an industrial frequency current, is multilayer, and the coil winding, fed by an increased frequency current of 500 Hz, is single-layer. 2. The ring inductor according to claim 1, characterized in that the turns of the coil windings are made isolated from each other and parallel to the upper and lower plates of the inductor. 3. The ring inductor according to claim 1, characterized in that the lower plate and the additional upper plate are connected by bushings. 4. The annular inductor according to claim 1, characterized in that the clamps of the coil windings in the radial direction include racks located between the lower and upper plates opposite the winding and isolated from them, and the racks are provided with threaded holes or welded nuts in the center for passage of the clamping bolts, pressing on dielectric bars placed on the lateral outer surface of the fixed winding. 5. The annular inductor according to claim 1, characterized in that the clamps of the coil windings in the vertical direction include threaded holes or welded nuts placed on the upper and / or lower plates for the passage of clamping bolts pressing on the dielectric bars placed on the upper and / or bottom surface of a fixed winding. 6. The ring inductor according to claim 1, characterized in that the fittings for supplying and discharging cooling water are connected by hoses to the inlet and outlet manifolds of the circulating water system located on an additional lower board. 7. The ring inductor according to claim 1, characterized in that the C-shaped magnetic cores are prefabricated 90-120 mm thick from 0.35 mm thick electrical steel sheets. 8. The ring inductor according to claim 1, characterized in that the end sheets of the prefabricated magnetic circuits are equipped with tabs, which are bolted to the upper and lower plates of the inductor.

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