RU2237386C2 - Automatic coupler shank heating unit - Google Patents

Abstract

FIELD: process equipment of car repair shops.

SUBSTANCE: proposed unit designed for heating areas of coupler shanks prior to straightening them has its inductive coil secured so that its internal surface is equally spaced from heat insulation of housing on all four edges. Enclosed circular slit space formed in this way is used for forced passage of air flow designed to protect inductive coil from heat penetrating from coupler shank area heated to 800 - 850°C through housing and heat insulation and to discharge it into the atmosphere together with air. Proposed design solution enables heater connection to commercial-frequency 220 - 380 V supply mains.

EFFECT: greatly enhanced productivity of heating unit.

1 cl, 3 dwg

Description

Installation for heating shanks of automatic couplings refers to the technological equipment of car repair enterprises and is intended for heating for editing bent shanks of automatic couplings.

A device for the induction heating of the shanks of automatic couplings (Patent RU 2091987 C1, class N 05 B 6/36, published September 27, 1997), which can serve as a prototype.

The main disadvantages of this device are:

- low productivity of the device due to the limited power of the inductor:

- the impossibility of the device without a step-down transformer;

- insufficient durability of the inductor, heating during operation to a temperature of 500-600 ° C.

Inductors are known that are wound from a tubular section profile for passing coolant, such as water, through them. The heat absorbed from the heated object and the heat generated in the inductor itself, due to its ohmic resistance, are well removed in them.

However, such technical solutions are not applicable for multilayer induction coils with a large number of turns operating at mains voltage and frequency.

The aim of the invention are:

- increasing the productivity of the installation by increasing the power of the induction coil to the application paths for its power supply voltage;

- improving the reliability and durability of the induction coil;

- elimination of the intermediate link - step-down transformer.

This goal is achieved through the use of an air screen, which is a forced flow of air with an initial temperature of 15-30 ° C between the inner surface of the induction coil and the insulation of the housing, which removes heat into the atmosphere that has penetrated from the heated zone of the shank of the automatic coupler through the housing and thermal insulation and prevents heating the induction coil above the temperature allowed for this class of insulation.

The use of an air screen makes it possible to create favorable conditions for the induction coil in the temperature regime acceptable for its isolation at the supply voltage from the mains, to realize the necessary power for the desired installation performance, and also to ensure the durability of the induction coil and heating installation.

Figure 1 presents the described installation for heating the shanks of automatic couplings in a section along aa in figure 2; figure 2 is the same in section along BB in figure 1; figure 3 is the same view along arrow B in figure 1.

Installation for heating shanks of automatic couplings includes a housing 1, a lower flange 2, an upper flange 3, an induction coil 4, four magnetic cores 5. The lower flange is connected to the housing by welding, the upper flange is worn on the housing of the mounting base. The outer surface of the housing (facing the coil) is thermally insulated with a layer of kaolin wool 6. The induction coil is put on the housing with a slot gap 7 and fixed between the flanges so that its inner surface is equidistant from the insulation of the housing along all four faces. The slotted annular space thus formed is intended for forced passage of an air stream that removes heat penetrating from the hot zone of the shank. To release the heated air into the atmosphere, holes 8 in the upper flange are used. Fastening of the induction coil between the flanges is done by the tie rods 9. To limit the tightening of the induction coil by the flanges, spacer tubes 10 are installed between them. Between the ends of the induction coil and the flanges there are gaskets 11 made of heat-insulating material.

U-shaped magnetic circuits encircle the induction coil from the ends and have the possibility of limited movement in the direction perpendicular to the longitudinal axis of the installation. The movement to the axis is limited by the flanges, and from the axis by stop angles 12 fixed by the tie rods. The freedom of movement of the magnetic cores ensures the fit of the end surfaces of their racks to the shank of the automatic coupler. An annular air collector 13 with an inlet pipe 14 and four taps 15. is fastened to the lower flange. The air distribution boxes 16 are hermetically connected to the lower flange. They are fastened with the help of caps 17, supports 18 and bolts 19. Connection of the air distribution boxes with taps made by pieces of flexible hoses 20. Cooling air is supplied by a fan through a pipe to the manifold, from where it enters the air junction boxes through the taps and, passing through the holes in the lower flange 21, olnyaet space between the inducing coil and the housing. Having passed through the annular space between the induction coil and the tapol insulation, heated air is discharged into the atmosphere through drilling in the upper flange.

A terminal block 22 with copper studs 23 is fixed on the upper flange. The terminals 24 from the induction coil are attached to them. The terminal block is closed externally by terminal box 25 with sleeve 26 for supplying the power cable. The ends of the wires of the supply cable are fixed on copper studs on the opposite side from the terminals of the induction coil.

To prevent the effect of a short-circuited turn, the body and both flanges have a continuous cut 27 of a width of 2-3 mm lying in the same plane. The flanges at the cut points are fastened on both sides by steel plates 28 using bolts 29. The steel plates are insulated from the flanges by electrical insulating gaskets.

The ground wire is connected to the upper flange with a bolt 30 with nut and washer.

Transport loops 31 are fixed to the upper flange.

The heating of the shank portion of the automatic coupler occurs due to the eddy currents arising in it under the influence of an alternating magnetic flux during the passage of current through the turns of the induction coil.

The described heating installation can be fixed stationary on a special rack in an inverted 180 ° position. In this case, the body of the automatic coupler is grabbed by the lifting mechanism behind the head and inserted by the shank into the heating installation.

Sources of information

1. Device for induction heating of shanks of automatic couplings. Patent RU 2091987 C1 class H 05 B 6/36 of 09/27/97

2. A.E. Sukhotsky, S.E. Ryskin. Inductors for induction heating. Energy, Leningrad branch, 1974

3. M.G. Lozinsky. Industrial application of induction heating. M., Publishing House of the Academy of Sciences of the USSR, 1958

Claims (1)

Installation for heating shanks of automatic couplings, comprising a housing with a thermally insulated outer surface and rectangular windows, a multi-turn multi-layer induction coil of rectangular cross section, fixed between the flanges of the housing, designed to connect to an alternating current source of industrial frequency and voltage, four magnetic cores located along the side faces of the coil, characterized the fact that the induction coil is fixed so that its inner surface is equidistant from the heat insulated hydrochloric surface of the housing to form therebetween a closed space slit, four edges of which are designed for the forced passage of air stream delivered from the annular collector four air distribution boxes through hole in the lower flange and discharged into the atmosphere through the hole in the upper flange, and serving the air screen.

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