SU56603A1 - Electromagnetic Vibrator - Google Patents

Description

Modern solenoidal vibrators, when operating at a current of 50 Hertz, give 6000 or 3000 vibrations per minute, which is too much for heavy objects.

The proposed solenoidal vibrator, when supplied with a current of 50 Hertz, gives 1500 vibrations per minute and can be used to vibrate large objects (sieves in the mining industry, construction, grain and milling industry, etc.).

The essence of the invention, consisting in a special structural form of the electromagnetic vibrator, is illustrated in the schematic drawing, in fig. 1-5 of which five variants of the proposed vibrator are shown, and in FIG. 6 is a diagram illustrating the effect of the vibrator;

In the vibrator on fpg. 1 measles is composed of two iron plates / connected mechanically, for example with staples 2; 3 is designated. mag and pipeline, 4 - its middle part, 5-solenoid winding, adventure to the AC network.

One of the parts of the magnetic circuit is somehow magnetized. This can be done, for example, by removing from a permanent magnet or

the middle part of the magnetic core (which is most convenient), or the magnetic core 3 (magnetizing it from the middle to the ends) or measles / - /, or making the entire magnetic core of a magnet.

It is also possible to magnetize the vibrator with the help of a second separate coil mounted on the middle part 4 and fed with a direct current. Finally, leaving only one solenoid coil, feed it through a rectifier (for example, cuprox or selenium), and make the entire magnetic circuit iron.

Consider the operation of the vibrator of FIG. 1. In this vibrator, the middle part 4 of the magnetic circuit is made magnetized. The power of the winding 5 is directly supplied from the AC mains (i.e., without a rectifier). In the diagram of FIG. The 6 lines of the magnetomotive force of a constant bias is denoted by L. The curve T of the resulting ppm, due to the bias, will be raised above the x-axis OX, i.e. the maximum ppm. will not be twice during the current period, s once. Similarly, the force of attraction of the core to magnetically generated 3 will reach a maximum once per period. Parts 1 core will be drawn in opposite directions; the direction of the resultant force will depend on which gap is larger: b or b.,. Let, for example, by the moment of maximum ppm. the gap 6i will be smaller. Then, under the action of the resulting force of attraction, measles will move to the left. After that, let, for example, under the action of a spring, measles in the period of minimum, ppm. will move to the right and will move to the middle position at the moment when the current of the solenoid changes its direction. Now at the time of the second maximum of the m. D. measles will be attracted to the right. Then, under the action of the elasticity of the spring in the period of minimum ppm. the turn to the left begins, after which the cycle repeats. The striker movement is shown in FIG. b curve R.

As can be seen from the diagram, the time of one period of oscillations of the core is equal to two periods of the current, i.e., the number of oscillations will be equal to 1500 per minute at a current frequency of 50 hertz. In the site diagram, the intake forces corresponding to the useful work (indicated by vertical hatching) will be larger than the brake work areas (indicated by horizontal shading); due to this, oscillatory motion is maintained,

The proposed vibrator can be structurally modified by one of the options shown in FIG. 2-5.

In the embodiment of FIG. 2, the magnetic core has no parts with a magnetizing, but the winding is fed through a rectifier.

In the vibrator of FIG. 3 magnetic circuit compared to the main variant of FIG. 1- made double.

In the vibrator of FIG. 4, the measles / is located inside the magnetic circuit and the pole protrusions of the latter are polarized (in all the figures the polarity of the magnetised parts of the magnet is indicated by the letters N

and S). In this embodiment, the magnetic flux F meets only one axial air gap. Therefore, this design of the vibrator is especially applicable at large amplitudes of oscillations.

The vibrator of FIG. 5 differs from the previous one only in the arrangement of the coil and its powering through the rectifier 6, which eliminates the need for extraneous constant biasing.

The subject matter of the invention.

Claims (4)

1. Electromagnetic vibrator with a spring loaded moving part (korom or rm) having a frequency of vibrations half the frequency of the supplying alternating current electromagnet, characterized in that when the magnetic circuit is biased to a value at which the magnetic flux pulses, the measles are made that it closes at least two branches of the magnetic circuit of the rome through unequal in the initial position air gaps located at the ends of the fixed part of the vibrator and so commensurate that, with a maximum of itnogo flow givals armature attracted to a corresponding end of the yoke, at a minimum - and was returned back by inertia passed over center position by a spring, and the next maximum givals attracted to the other end of the yoke. 2. In the vibrator according to claim 1, use a permanent magnet constituting the magnetic circuit or a part thereof to bias the magnetic circuit. 3. In the vibrator of claim 1, use an additional winding fed by direct current to bias the magnetic circuit. 4. In the vibrator according to claim 1, use a rectifier in the winding circuit of the working electromagnet to effect the magnetic bias of the magnetic circuit. Y. author's certificate A. 56603 I. Moskvitina 2. S -ffit Figl. Fig5. Figz.