SU1146802A1 - Photoelectric converter of shaft turn angle to electric pulse sequence - Google Patents

Abstract

1. A PHOTO-ELECTRIC CONVERTER OF TURNING ANGLE OF A SHAFT INTO THE SEQUENCE OF ELECTRIC IMPULSES, containing a disk mounted on the shaft, optically connected through the apertures of the disk, the first and second emitter and photoreceiver, the output of the first photo-receiver is connected to the i-ray, and I can use the i-ray and I-I-I-I-I-I-I-I-I-I-I-PULSES , in order to increase the reliability of the converter, a controllable coupling, a counter, a second RS flip-flop, a delay element, and a disk are made with two rows of shifted ones relative to the other half-pitch holes, the first emitter and the photodetector are installed against the holes of the first row of disk, and the second emitter and photoreceiver are installed against the holes of the second row of disk, the output of the second photodetector is connected via an appropriate comparator to the R input of the first RS trigger, the first output the first RS trigger is connected to the first output of the second radiator and the first input of the counter, the second output of the first RS trigger is connected to the first output of the first radiator, the second outputs of the first and second radiators are connected A zero-potential cable, the output of the delay element is connected to the second input of the counter, the output of which is connected to the R input of the second RS flip-flop, to the information input of the delay element and is the output of the converter, the input of the delay element i is the first control input of the converter. The S-input of the second RS-flip-flop in (L is the second control input of the converter, and the output of the second RS-flip-flop is connected to the control input of the controllable coupling, which is kinematically connected to the shaft of the object being monitored and to the shaft of the disk. 2. The converter according to claim 1 , characterized in that the first emitter and photodetector are installed diametrically counter-O5 positively by the second emitter and photodetector.

Description

The invention relates to automation, information measuring and computing techniques and can be used to convert angular displacements into a number of pulses proportional to the magnitude of the displacement.

A photoelectric converter for the angle of rotation of the shaft into a code containing illuminators optically coupled through corresponding tracks of the coding disc with reflectors attached to the input shaft, optically coupled to the photodetectors displaced along the displacement direction of the photodetectors, an anvil and a movable bracket that is frictionally connected to the hub are known encoding disk 1.

The disadvantage of this converter is low reliability due to the possibility of the oscillatory movement of the coding element when the rotation of the shaft is stopped.

The closest in technical essence. g; The invention is a photoelectric converter of rotation angle. The code contains a disk mounted on a shaft, optically connected first and second emitter and photodetector through disk apertures. The output of the first photodetector is connected through an appropriate comparator with the S input of the first RS trigger 2.

The disadvantage of the known converter is that the pulse at its output is very short with uncontrolled duration, since it is determined only by the switching time of the memory trigger. The reliability of the transmission of such pulses over a circuit with a capacitive component of the resistance even for an insignificant distance is very low.

The purpose of the invention is to improve the reliability of the formation of pulses of a photoelectric converter of the angle of rotation of the shaft into a sequence of electrical pulses.

The goal is achieved by the fact that in a photoelectric converter, the angle of rotation of the shaft into a sequence of electric pulses containing a disk mounted on the shaft, the first and second radiator and photodetector optically connected through the disk holes, the output of the first photodetector is connected through an appropriate comparator to the S input of the first RS trigger, a controlled clutch, a counter, a second RS trigger, a delay element, a disc are made with two rows of holes shifted one relative to the other by half a step, The second emitter and photodetector are installed against the holes of the first row of disc, and the second emitter and photoreceiver are installed against the second row openings, the output of the second photodetector is connected via an appropriate comparator to the R input of the first RS trigger, the first output of the first RS trigger the output of the second radiator and the first input of the counter, the second output of the first RS flip-flop is connected to the first output of the first radiator, the second outputs of the first and second radiators are connected to the zero potential bus, the output of the element the delay is connected to the second input of the counter, the output of which is connected to the R input of the second RS flip-flop, to the information input of the element, the delay and is the output of the converter, the input of the delay element is the first control input of the converter, the S input of the second RS flip-flop is the second control input of the converter, and the output of the second RS flip-flop is connected to the control input of the controllable clutch, which is kinematically connected to the shaft of the object being monitored and to the disk shaft.

The first emitter and photodetector are installed diametrically opposed to the second emitter and photodetector.

FIG. 1 shows a functional diagram of a photovoltaic converter; in fig. 2 - disk with holes; in fig. 3 - time diagram of the converter operation.

The photoelectric converter of the angle of rotation of the shaft into a sequence of electric pulses contains a disk 1 with holes 2 and 3, emitters 4 and 5, photodetectors 6 and 7, comparators 8 and 9, trigger 10, counter 11, delay element 12, trigger 13, a controlled clutch 14, a controlled object 15 and a shaft 16.

The Converter operates as follows.

In the initial state, the shaft of the object to be monitored 15 rotates, but the rotation is not transmitted to the shaft 16, since the controllable clutch 14 is disconnected and the shaft 16 is braked. On signal 17 (FIG. 3), the start trigger 13 overturns and turns on the clutch 14, the shaft of the object to be monitored 15 articulates with the shaft 16 and the disk 1 begins to rotate. Holes 2 on disk 1 are offset with respect to holes 3 by a step equal to the angle (Fig. 2).

When the disk 1 rotates, the emitters 4 and 5 light up the photoreceivers 6 and 7 alternately, at the output of the comparators 8 and 9, pulses 18 and 19 spaced apart in time are formed, which alternately switch the trigger 10. Mode. operation of the converter is set by the counter 11 (pulses). Suppose that the counter 11 is prepared for operation in the counting mode up to 3, and a high potential at the single output of the trigger 10 and a current flows through the radiator 4, and at the zero output of the trigger 10 the low potential n the radiator 5 is de-energized. As disk 1 rotates, hole 2 passes between emitter 4 and photodetector 6. At the output of comparator 8 a pulse 18 is formed, on the leading edge of which trigger 10 changes its state, turns off emitter 4 and turns on emitter 5, excluding the possibility of generating false pulses due to fluctuations in the optical communication channel or due to micro-oscillatory movements of disk 1 caused by uneven movement of the shaft 16 or vibrations from working with a variety of mechanisms and machines. At the time of triggering the trigger 10 by the signal 20 on the leading edge, the counter 11 counts one pulse, but no changes occur at its output, since it is prepared for counting up to 3 pulses. As the disk rotates further, 1 the control process of the trigger 10 is cyclically repeated. After the end of each cycle, counter 11 reads one pulse. At the time of the completion of the third cycle, the output of the counter 11 is set to a low signal level, by which the delay element 12 is triggered and the flip-flop 13 overturns, with the result that the clutch is turned off, the shaft 16 is split with the shaft of the object 15 and is braked. By decelerating the shaft 16, the possibility of oscillating movement of the disk 1 backward by an angle greater than the angle dC at which the normal operation of the converter is disturbed is excluded. Upon expiration of the delay time T, which can be set within the required limits, a pulse is formed at the output of the delay element 12, which sets the counter 11 to the initial state. Thus, the duration of the information pulse at the output of the converter is determined by the delay time T and can vary within wide limits. The formation of the next information pulse at the converter output occurs only by the following external command “Start. In the case when the output of the converter requires not single information pulses, but a pulse sequence, then the S input of trigger 13 instead of the start signal is reached: a low level potential that holds it in a single state. Clutch 14 is engaged all the time, and disk 1 rotates continuously. For normal operation of the delay converter, the time f should be set less than the pulse period at the input of the counter I. The technical and economic effect of using the converter is determined by the indicated advantages.

2

Claims (2)

1. A PHOTOELECTRIC CONVERTER OF A SHAFT TURN ANGLE IN A SEQUENCE OF ELECTRICAL PULSES, containing a disk mounted on the shaft, optically connected through the holes of the disk, the first and second emitter and photodetector, the output of the first photodetector is connected through the corresponding comparator to the S-input of the first RS , in order to increase the reliability of the converter, a controlled coupling, a counter, a second RS-trigger, a delay element, and a disk are made with two rows of shifted one relative to the other about half the pitch of the holes, the first emitter and photodetector are installed against the holes of the disk of the first row ' The RS trigger is connected to the first output of the second emitter and the first input of the counter, the second output of the first RS trigger is connected to the first output of the first emitter, the second outputs of the first and second emitters are connected to the bus zero potential, the delay element output coupled to a second input of the counter, the output of which is connected to the R-input of the second RS-flip-flop, to the information input of the delay element is the output transducer, the input of delay element § is the first control input preob- "verters. The S-input of the second RS-flip-flop is the second control input of the converter, and the output of the second RS-flip-flop is connected to the control input of the controlled clutch, which is kinematically connected to the shaft of the controlled object and to the disk shaft. 2. The converter according to π. 1, characterized in that the first emitter and photodetector are installed diametrically opposite to the second emitter and photodetector. SU ... 1146802