SU1631443A1 - Device for identifying direction of movement - Google Patents

Abstract

The invention relates to the automation of production processes, to devices that provide information on the direction of movement in the horizontal direction of various ferromagnetic objects. The aim of the invention is to improve noise immunity. An analysis of the direction of movement of the object being monitored occurs by the polarity of the first emerging EMF pulse, and the first pulse is synchronized by a signal from the output of the imaging unit 13 when magnet 1 is triggered. When a sync pulse is applied, one of the outputs of the device appears corresponding to the direction of motion of the object. 3 il.

Description

The invention relates to the automation of production processes, to devices that provide information on the direction of movement in the horizontal direction of various ferromagnetic objects.

The purpose of the invention is to improve noise immunity.

Fig. 1 is a schematic diagram of an apparatus for determining the direction of movement of objects; FIG. 2 shows a node for rotating and moving a magnet in isometry; Fig. 3 shows the charts of EMF pulses and voltages arising at the output of the measuring winding (EC), at the output of the generator (Unp), at the output of the imager (UV) with different variants of the object's movement: A - movement of the object on the left, B - repeated run on the left, B - movement of the object on the right, D - repeated entry on the right.

The device comprises a permanent magnet 1 mounted inside the measuring winding 2 on an axis 3, perpendicular to the plane passing through the magnetic axis of the magnet and the line of movement of the object. The axis 3 is movably mounted in the supports 4 and passes through an opening inside the magnet 1. The inner opening of the support 4 is made in the form of an ellipse, with the result that the axis 3 has the ability to move vertically along the major axis of the elliptical opening of the support 4. Both supports 4 are fixed on racks 5. For Restrictions of the angle of rotation and the course of the magnet 1 at the levels of the upper and lower edges of the measuring winding 2 are set to limiters (not shown). One of the supports 4 is installed between the radiator 6 and the infrared radiation receiver 7, and in this support 4 there are two holes 8 coaxial with the radiator and receiver, one of which is located opposite the radiator 6, and the other against the receiver 7. As radiator 6 is used LED, as receiver SL

with

with with

S

CJ

photodiode. The output of the measuring winding 2 is connected to the inputs of the waiting multivibrators 9 and 10. The output of the multivibrator 9 is connected to one of the inputs of the AND 11 logic unit, and the output of the multivibrator 10 is connected to one of the inputs of the logical block I. The output of the receiver 7 is connected through the driver 13 to the second inputs logical blocks 11 and 12. Block output

11 is the informational output of the device corresponding to the direction of movement of the object Left, and the output of the block

12 according to the movement of the object Right. Multivibrator 9 is triggered by pulses of negative polarity, multivibrator 10 by pulses of positive polarity.

Shaper 13 is a differentiating chain, the output of which appears only with a positive voltage jump at its input. Blocks 11 and 12 are positive signal matching circuits at both inputs.

The device works as follows.

Suppose that in the initial state the left pole of the magnet N (Fig. 1) is omitted and the right pole S is raised. When the ferromagnetic object approaches the device on the left, the permanent magnet 1 rotates in the direction of clockwise rotation, i.e. the left end of magnet 1 (pole N) rises towards the object, and pole S descends, in addition, magnet 1 rises, axis 3 at the same time moves inside support 4 to the upper position and blocks holes 8. During movement of magnet 1, pole N force lines intersect the turns of the left (figure 1) sector of the winding 2 from the bottom up, and the lines of force of the pole S intersect the turns of the right sector of the winding 2 from top to bottom. Taking into account the principle of relativity, i.e. Considering that the turns of the winding 2 move relative to the stationary magnetic field lines, according to the rule of the right hand, we find that in the left sector of the winding 2 an emf arises from us (+), and in the right part to us (). The resulting EMF is added from the EMF in the left and right parts of the winding 2, the polarity of the resulting EMF is positive, then the multivibrator 10 is triggered, from the output of which a positive impulse is fed to one of the inputs of the I 12 unit (Fig. 3, first positive pulse Ек, I movement option). At the same time, a positive impulse also arrives at the second input of the AND 12 block from the output of the receiver 7 via the imager 13 (FIG. 3, impulse UV, I variant). The AND 12 block is triggered, issuing from its output a signal corresponding to the direction of movement of the object to the right. Further movement of the object over the device at some point will force the magnet 1 to sharply reorient - the left pole N will go down and the right S will turn up. The polarity of the EMF detected by turning the magnet 1 in the direction opposite to the black arrow will be opposite to the polarity of the previous pulse (Fig. 3, the second pulse Ek, I variant). Magnet axis 3

1 is still elevated and blocks the flow between the radiator 6 and the receiver 7.

5 At the outputs of blocks 11 and 12, there are no signals, since there is no signal from the receiver 7 When the object is removed further, the interaction of the S pole with the object ceases, and the magnet 1 is lowered to its initial state 0, the N pole is below, the S pole is on the top. The resulting EMF bursts in both sectors of the winding 2 have one-a-polarity and are mutually destroyed. Axis 3 is lowered onto the lower surface of the support

5 4, the radiation flux through the holes 8 is restored. novils, at the output of the receiver the potential is O.

The II variant of the movement of the object in FIG. 3 corresponds to the repeated passage of the object.

0 from left to right.

Consider the third variant, when the object changes the direction of movement and moves from the device from right to left. The initial state of the moving magnet 1:

5 pole N below, pole S above. When the object approaches from the pole side S, a full-fledged rotation of the magnet 1 around the axis 3 does not occur. In this case, the right part of the magnet (pole S) is raised to a height determined by the movement of the movable axis 3 in support 4. The left part of magnet 1 (pole N) is practically stationary. In the right side of the measuring winding 2, an EMF pulse arises, directed in figure 1 away from us (+). The resulting value of the emf at the outputs of the winding

2 will be determined by the amplitude of this pulse (Fig. 3, option III, the first negative pulse). The amplitude of this pulse is somewhat lower, since in this

0 case, only one half of the measuring winding 2 worked. A negative EMF pulse triggers the multivibrator 9, a positive pulse arrives from its output to the input of the AND 11 block. At this moment the receiver 7 is bathed, from the output of the imaging unit 13, a second impulse arrives at the second input of the AND 11 unit, opening the AND 11 block, the output of which is a signal corresponding to the movement of the object to the Left. The second positive pulse at the output of the measuring winding 2 arising in it when the magnet 1 is transferred, when the N pole jumps up and the S pole falls, does not cause a response of blocks 11 and 12, since the pulse not coming from the generator 13 output blocks 11 or 12.

The device works in a similar way when the object passes from right to left (FIG. 3, IV variant). The amplitude of the first negative pulse is now higher than the amplitude of the same pulse in the previous case, because after the first pass of the object from right to left, the pole S remains at the bottom and when the object appears, the magnet 1 again turns around axis 3 against the direction of the clockwise direction, exciting EMF pulses consonant in both sectors of the winding 2.

In the proposed device, an analysis of the direction of movement of the object occurs according to the polarity of the first EMF pulse that occurs, while the first pulse is synchronized by a signal from the output of the former 13 when magnet 1 is triggered. 5 When a sync pulse is issued, one of the outputs of the device appears corresponding to the direction of motion of the object.

Claims (1)

Invention Formula 0 Device for determining the direction of movement, containing a permanent magnet, installed with the possibility of rotation, measuring winding, optical sensor with a movable damper, unit 5 registration, characterized in that, in order to improve the noise immunity, the permanent magnet is mounted on a rotary axis, perpendicular to the plane passing through the magnetic axis line 0 of the magnet, and the rotatable axis of the magnet itself is mounted in supports with openings with the possibility of vertical movement, Line movement of the object. / / / / FIG. 2