The device for heating of bearings

In this article it will be a question of such useful device as the transformer for heating of bearings, semi-couplings, pulleys which allows without problems and efforts it is easy to put on them the shaft. It heats decently and, in comparison with the hot oil bathroom, undoubtedly more conveniently, quicker and more effectively.

Приспособления для нагрева подшипников качения при посадке их на вал

Devices for heating of rolling bearings at their landing to the shaft: and — the oil bathtub — the device for induction heating of bearings; 1 — the reservoir, 2 — the lifting basket, 3 — the heater, 4 — insulating stuffing, 5 — the plate, 6 — the bearing, 7 — the core, 8 — the hinge, 9 — clips, 10 — primary winding.

The principle of work is simple. It is the normal transformer which has one network winding, and the bearing carries out the role of secondary winding, in the mode of the short-circuited round. Availability of the short-circuited round in the winding also causes its heating. For example, if the winding of the electric motor has turn-to-turn fault, then this engine will quickly heat up and will burn down with such fault. Here on the basis of this phenomenon the device for heating of the listed above parts was also constructed.

Heating on time can be the miscellaneous and there is from this what area of the magnetic conductor, quantity of rounds on the network winding, the section of the wire of the winding and what crossing point of the magnetic conductor (cross-sectional area).

Now it is a little about technical aspect. Do the size of calculation what bearings, semi-couplings and pulleys on your equipment. The set of the package S-50 of cm at me / 2. By simple calculation 1 round on volt, so turns out 220 rounds. But we have the sectional area of crossing points much less, than the section of the main magnetic conductor as it is necessary to heat 205, 204 sizes of bearings. It is possible to wind rounds 300-320 safely, here big it is not necessary to accuracy. This transformer is reeled up by the aluminum wire, the section of 2.5 mm / 2, the section of the magnetic conductor of 50 cm / 2, quantity of rounds-310.

Эквивалентная схема нагрузки для индукционного нагрева

Dual circuit of loading for induction heating.

Package P-shaped, it is possible to varnish each plate, I used furniture. But at first we do the good coil of textolite or the micarta, 2-4 mm thick. Further we collect the package from prolachenny iron. If there is the iron with openings on four coupling bolts at once, then it will be fine. At me on this transformer lower existing were, and here upper it was necessary to drill. Having collected the P-shaped package, we pull together it with bolts in four points via insulators that bolts did not concern iron.

Now still few times it is necessary to pass varnish on all collected design. Further we begin to wind the winding. If on the coil two pieces, it does not matter, can be made twist and if also to bring her outside, then all it will be fine. The wire needs to be prepared: we cut off native isolation and we wind with tapes from cotton, it is possible to let the old sheet to this business.

Схема простейшего трансформатора

Scheme of the elementary transformer.

I did ribbons 1 m long, and 2-3 cm wide, fixed the junction of ribbons the insulating tape piece, then few times we varnish, it is well absorbed. When new isolation dries, it is possible to start winding of the winding, in addition from above impregnating each layer with varnish. Having reeled up the last row, we do the bandage on all width of the coil. Again we put the varnish coat which will fix all winding.

We connect the available two conclusions to the starting automatic machine fixed by the row on the site with protection face value, having measured by clamp-on meters at the first trial start-up. It is better to make measurement on current on the thinnest crossing point. Crossing points it is possible to make a little, under different numbers of bearings. It is possible to make them of normal roofing iron, to pull together with aluminum rivets. Surely the planes of contact should be ground in well that there were no gaps, otherwise there will be the jingle during the operating time.

What does all this give us? First, quality of today's bearings, frankly speaking, very bad, and if we get the part the hammer, though through mandrels, there is the high probability because of the tightness that the working layer, "racetrack", can give the microcrack which will result in fast wear of the bearing, but it can happen also to bearings of high quality.

Having summed up the result of the article, I want to tell the following. If you have the decent number of units and mechanisms and you worry about their work, give day three-four for here such simple adaptation, and I assure you that you will be satisfied with the design. If all of you make correctly, then during the most heavy load your device for heating of bearings will quietly work.

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