SU374915A1 - Method of orientation of nonmagnetic conductive parts - Google Patents

Description

one

Methods are known for orienting non-magnetic conductive parts fed through a tray through a pulsing non-uniform magnetic field with the direction of its gradient from the part towards the tray. In order to reduce the frictional force of the details of the tray in the known methods, a partial de-suspension of the oriented parts is created.

The proposed method is characterized in that the direction of the magnetic field gradient non-periodically reverses.

This ensures that the vibrations of the oriented parts are rapidly damped and, therefore, the orientation time is reduced.

With a sufficient amount of electrodynamic clamping, the component can be rapidly braked periodically. This ensures aperiodic movement of the part to an oriented position with a short orientation time. Periodic electrodynamic de-objectification of a part leads to a rapid rotation of the part (since the moment of frictional forces during the unbalancing of the part is absent or very small) and to greater accuracy of orientation.

FIG. 1 shows a possible scheme for making a periodic change in the direction of the gradient of an alternating magnetic field in the orientation zone; in fig. 2-forces acting on the part, with different directions of the gradient of the field, and the corresponding movement of the part; in fig. 3 - dependence of the angle of rotation of the orientable part on the time t with a variable direction of the magnetic field gradient and in a uniform magnetic field.

Part 1 of the tray moves into the space between the poles 2 of the electromagnet, i.e., in the orientation zone.

In the orientation zone are coils 3 and 4 (above and below the part) connected in series with phase-shifting chains containing, for example, adjustable capacitances 5 and 6 and inductances 7 and 8. This allows tuning coils 3 and 4 as the frequency changes.

In the coils penetrated by an alternating magnetic field of an electromagnet, when contacts 9 or 10 are closed, currents induce magnetic fields, which add up to a uniform (close to uniform) field of the electromagnet in the orientation zone and form in the orientation zone a magnetic field with a pronounced gradient. The direction of the gradient depends on which of the contacts (9 or 10) are closed at the moment.

Pins 9 and 10 are closed and open, but by a certain program with the help of the switching device 11. The part is affected by the moment of the electrodynamic forces M and the force F pushing out of the floor (see Fig. 2), which is added or subtracted with the weight of the part P depending on addition, as of the coils (3 or 4) is closed at the moment. By periodically closing and opening the contacts 9 and 10 (see FIG. 1), the magnitude and direction of the force F is changed, thereby changing the magnitude of the moment of friction forces. (see Fig. 2), which results in braking or acceleration of the angular movement of the oriented part. With an appropriate selection of the magnitude and duration of the forces of the pressing and unbalancing, it is possible to ensure the rapid movement (rotation) of the part to the equilibrium position, oriented without passing through this position (see Fig. 3). The proposed method can be used in the radio electronic and instrument-making industry when orienting nonmagnetic conductive parts. The subject of the invention is a method for orienting non-magnetic conductive parts supplied through a tray through a pulsing non-uniform magnetic field with the direction of its gradient from the part towards the tray, characterized in that, in order to reduce the orientation time by providing a fast decay of the oscillations of the oriented part, the gradient of the magnetic zero periodically change to anti-full.

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Fig 2