SU1241472A1 - Shift-to-digital converter - Google Patents

Abstract

The invention relates to the field of automation and can be intended to measure the large displacements of the working bodies of measuring machines and numerical control machines. The aim of the invention is to improve the accuracy of the conversion. The implementation of this goal is achieved by the fact that the photodetectors are mounted stationary relative to each other and have the possibility of moving relative to the line 7 light sources. Their movement is carried out by the organ 3, kinematically connected to the electric actuator 2, which is controlled by software device 1. The position of the photoreceivers 4-6 relative to the ruler 7 is fixed by the counter 8. The generator 25 generates polling pulses that go to the modulators 22-24. In the case of pairing a photodetector 6 with a ruler 7, the signal through modulator 24 passes multiplexer 21, integrator 44, null organ 45 and enters trigger inputs 36 and 37. In the absence of movement of photodetectors 4-6, the signal shift I (Phase 4 h tC

Description

there is no catch at the output of the modulator 24 and the output of the counter 28, and as it moves, it appears. The inputs to the input of the counter 28, the phase shift signals increase the shift and, in the absence of further movement, result in a zero phase shift of the counter 28 and the zero body 45. At the same time, the pulses go to the counter 49 where they form a number proportional to the displacement of the mobile organ 3. In the case position of line 7

The invention relates to automation and computing and can be used to accurately measure the large movements of the working bodies of measuring machines and CNC machines.

The aim of the invention is to increase the accuracy of the converter.

FIG. 1 shows a functional diagram of the converter; in fig. 2 is a diagram of a software device.

 The converter contains software device 1, electric drive 2, mobile unit 3, photodetectors 4-6, ruler 7, counter 8, decoders 9-1 1, elements 12 and 13, trigger 14, elements 15-18, elements 15-18 , elements OR 19 and 20, multiplexer 21, modulators 22-24, generator of 25 pulses, counter 26, decoder 27, counters 28 and 29, elements OR 30 and 31, elements 32-35, delays, triggers 36-39, elements 40-43, integrator 44, null-organ 45, integrator 46, null-organ 47, element 48, counter 49, software device 1 contains generators 50 and 51, pulses, switches .52 and 53, counter to 54, multiplication unit 55 or 56 and a switch.

The Converter operates as follows.

Before the measurements are started using the software device 1 and the electric drive 2, the mobile unit 3 is set to its initial position, in which the optical detector 6 is in optical conjugation with the ruler 7. And between the photocontrollers 5 and 6 or 5 and 4 the signal through the element 48 and 48 paet for trigger 14, which forms a prohibition signal for passing information to the counter 49. When the organ 3 with photolines 4-6 moves to the other side, the operation of the transducer is similar to that described. In this case, triggers 38 and 39 with elements And 42 and 43 are involved in the formation of information signals. f-ly, 2 ill.

the reversing position is fixed by the reversible counter 8. The decoder 11 at this position is connected to the input of the integrator 46 by the multiplexer 21, the modulator 23 of the head 5, and to the input of the integrator 44 - the modulator 24,

In the initial position, a four-cycle polling pulse sequence is generated by the generator 25, the counter 26 and the decoder 27, which act on the modulators 22-24. However, since the photodetector 6 is in conjunction with the ruler 7, the signal will be only at the output of the modulator 24, which through multiplexer 21, integrator 44, null-organ 45 acts on triggers 36 and 37. In the absence of movement in the initial position The phase shifts of the zero-body signal 45 and the signal from the output of counter 28 with respect to the reference signal from the output of counter 26 are the same and the triggers 36 and 37 are not included. When moving the moving unit 3, the photodetector 6 moves relative to the ruler 7. At the same time, when moving in one direction, the phase shift of the signal from the output of the zero-body 45 is greater than the shift of the signal from the output of counter 28, while moving in the other direction it is smaller. In the first case, the difference in phase shifts is detected by trigger 37, while using element 40 through element 33 at the input of Subtracting the counter 28, pulses arrive, the number of which is determined by the difference of the phase shift of the signals from the output of counter 28 and the zero of the organ 45. These pulses increase

the phase shift of the signal from the output of the counter 28 and, if by the moment following the next polling pulse from the output of the counter 26, the moving organ was no longer present, then the phase difference of the signals from the outputs of the counter Z8 and the zero organ 45 will be zero and the pulses adjustment with zyhoda element And 40 do not come.

When moving the rolling element 3 in the other direction - the converter works in a similar way. The only difference is that the phase difference is fixed by the trigger 36, and the pulses from the output of the element AND 4 through the element 32 and the element OR 30 will be sent to the input of the element AND 16 or 15,

In the range of movement of the movable organ 3, in which the ruler 7 with the photodetector 6 is in optical conjugation, a counter signal 8 is sent to the element 12 and an input signal from the element 12 to the second input of the element 12 using the counter 8 and the decoder 9 And 48.

When the signals at the inputs of the element I 12 coincide, a signal appears at its output, which leads the trigger 14 to the state in which

Prescriptions the signal goes to the elements - ,,. for the purpose of

increase the accuracy of the conversion, it introduced software devices

You are both 15 and 16, and the enabling signal is to elements of And 17 and 18.

Thus, the pulses from the outputs of the elements And 40 and 41 through the elements And 15 and 16 and the elements OR 19 and 20, electric, the mobile body, second, third, fourth and fifth counters, two integrators, five trig e -

step on the inputs of the counter 49. Devices, eight elements AND, four

The device works in this way until the moment when the photodetectors 5 and 6 are simultaneously in conjunction with the ruler 7. In this position, elements 6, 24, 44, 45, 25, 26, 27, 36, 37, 40, 41 continue to operate. , 30, 32, 33, and 28 begin to parallelly form signals from the output of the modulator 23 through the multiplexer 21, which are fed to the integrator 46.

The signals from the output of the null organ 47 are compared in phase with the signals from the channel 1 output on elements 38, 39, 42, 43, 34, 35, 31, and 29, as described. The adjustment pulses from the outputs of the And 42 and 43 elements are fed to the inputs of the And 17 and 18 elements. The switching positions of the photoreceivers 4-6 are recorded by a counter 8 and a decipher; Ratios 9 and 10. The signals from the output of the decoders 9 and 10 disable the element And 12 and allow the operation of the element 13, to the second input of which do

,

d

five

five

0

signal Pause from the output of the element And 48, The signal from the output of the element 13 causes the trigger 14 in the opposite state and connects the outputs of the elements 42 and 43 to the counter 49.

Software device 1 (Fig. 2) works in the following way.

The generators 50 and 5I form pulse sequences by the switches 52 and 53, the output of the generator 50 is connected to the Addition or Subtraction inputs of the counter 54, which controls the block 55. From the output of the block 55, the sequence of pulses goes to the inputs + or - of the counter 8 and the decoders 9 and 10 through switch 56. At the same time, the same sequence of pulses is fed to the input of the electric drive 2.

Claims (2)

Invention Formula . The displacement transducer to the code containing the emitter optically connected to the ruler on which the raster track is applied, three photodetectors, the first, second and third elements AND, the first counter, the first and second zero-organs, the terminal, the electric wiring, the mobile unit , second, third, fourth and fifth counters, two integrators, five trig - - 0 five 0 the OR element, four decoders, four delay elements, a multiplexer, a pulse generator and three modulators, the first output of the software device is connected to the input of the electric drive, the output of which is connected to the input of the movable element, which is kinematically connected to the first, second and the third photodetectors, the outputs of which are connected to the first inputs, corresponding to nwx modulators, the outputs of which are connected to the corresponding information inputs of the multiplexer, whose outputs connected to the inputs of the first and second integrators, the output of the first integrator through the first null-organ is connected to the first inputs of the first and second triggers, the output of the second integrator is connected via the second null-organ to the first inputs of the third and fourth triggers, The first outputs of the first, second, third and fourth flip-flops are connected to the first inputs of the same elements And, the outputs of which are connected to the first inputs of the fifth, sixth, seventh and eighth elements And, respectively, the outputs of the fifth and seventh elements. And connected to the inputs of the first element OR, the outputs of the sixth and eighth elements L are connected to the inputs of the second element OR, the outputs of the first and second elements OR are connected to the inputs of the first counter, the second and third outputs of the software device are connected to the first and second inputs of the second counter, first and the second decoder, the output of the second counter is connected to the third inputs of the first and second decoders and to the input of the third decoder, the output of which is connected to the control input of the multiplexer, the outputs of the first first and second decoders connected to the first inputs of the ninth and tenth elements And, respectively, the outputs of which are connected to the first and second inputs of the fifth trigger, the first output of which is connected to the second inputs of the fifth and sixth elements And, and the second output is connected to the second the inputs of the seventh and eighth elements And, the output of the pulse generator is connected to the input of the third counter, with the second inputs of the first, second, third, fourth elements X and the first inputs of the third and fourth elements OR, the outputs of which are connected with the first inputs of the fourth and fifth counters, respectively, the outputs of which are connected to the second inputs of the third and fourth, first and second triggers, respectively. The first output of the third counter is connected to the input of the fourth decoder, the outputs of which are connected to the second inputs of the respective modulators, the second output of the third counter is connected to the third inputs of the first, second, third and fourth triggers, the second outputs of which are connected to the inputs of the eleventh element And whose output is connected to the second inputs of the ninth and tenth elements And, the outputs of the first, second, third and fourth elements I. Are connected to the inputs of the delay elements of the same name, the outputs of the first Delayed third elements connected c- ki second and third inputs of fourth OR elements, respectively, the outputs of the second and fourth delay elements compound with the second inputs of said fifth and chetverto-; th counter respectively, and line optically coupled to the photodetectors. - 2. The transducer according to claim 1, t - which is pro-, gram; The device contains two impulse generators, two switches, a counter, a switch and a smart, power supply, the output of the first pulse generator connected to the first and second terminals of the first switch, the third and fourth terminals of which are connected to the counter inputs, the output of which is connected to the first input of the block multiplication, the second input of which is connected to the output of the second pulse generator, and vpsod is the first output of the software device and connected to the first output of the second switch, the second and third outputs of which are homonymous outlets {n) ogrammnogo device. 56 (Reg. 2 Order 3614/56 Edition 816 Subscription floor gr. pr-tie, Uzhgorod, st. Project, 4 Subscription