CN2499794Y - Angle measurer - Google Patents

Abstract

An angle measuring instrument belongs to the field of measuring instrument. On account of inconvenience for installation and use of the prior angle measuring instrument, the utility model is characterized in that the rotary encoder can be arranged on the other shaft which is inline and keeps optional meshing ratio with the measured shaft. The utility model is composed of a rotary encoder, a singlechip, a phase discriminator, a counter, a register, a photoelectric sensor, and a monostable trigger, wherein the phase discriminator, the counter, and the register are connected between the rotary encoder and the singlechip; the UP output terminal and the DN output terminal of the phase discriminator are respectively connected with the UP input terminal and the DN input terminal of the 74LS192 counter array; the 74LS192 counter arrays keep parallel output and are connected with two 74LS374 registers; the two 74LS374 are connected with the singlechip unit in parallel port; the other end of the singlechip is connected with the photoelectric sensor used for detecting zero cursor and the monostable trigger used for generating fixed width pulse. The utility model has the advantages of reading and rating at any time, easy control, well stability, and convenient use.

Description

A kind of angel measuring instrument

(1) technical field: the utility model belongs to the measurement instrument field;

(2) background technology: present domestic and international existing angel measuring instrument, have plenty of and use the logic digital circuits chip to realize, also have plenty of and make of single-chip microcomputer that core devices realizes, no matter that is a kind of, they exist and install and inconvenient problem with use, because the zero degree pulse signal of measured axis and rotational pulse signal are all taken from same rotary encoder, the recurrent pulse number needs to set in advance, require rotation partially the sign indicating number device must be installed on the measured axis or be installed in engagement than being on other of 1: 1.

(3) summary of the invention: the purpose of this utility model provides a kind of angel measuring instrument easy to use.The utility model solved rotary encoder can be installed in measured axis have inside-connecting relation and the engagement than arbitrarily other the axle on.The utility model is made up of rotary encoder, single-chip microcomputer, phase detector, counter, register, photoelectric sensor and monostable trigger.In the middle of rotary encoder and single-chip microcomputer, be connected with the phase detector that changes pulse signal, the counter of cumulative encoder umber of pulse, the register of latch pulse number, the other end at single-chip microcomputer links with photoelectric sensor that detects the zero degree cursor and the monostable trigger that produces the Fixed width pulse, wherein phase detector by four Schmidt triggers, four different formula doors, three d type flip flops, two or and a not gate form, utilize R-C to form delay circuit, judge sense of rotation with the two-way time delayed signal again, thereby produce UP direct impulse signal and DN reverse impulse signal.Owing to adopted said structure, the utility model has the advantages that: 1. the umber of pulse n of reflection angle is stored in the 74LS192 array, can read at any time, and the single-chip microcomputer burden is little, easily control and good stability.2. instrument can record all umber of pulse N in good time, calibrates at any time.3. when work, rotary encoder can be installed in measured axis has inside-connecting relation and engagement than on other axle arbitrarily, uses very convenient.

(4) description of drawings

Fig. 1 is a fundamental diagram of the present utility model,

Fig. 2 is the utility model phase detector circuit schematic diagram,

Fig. 3 is the utility model phase detector circuit timing waveform,

Fig. 4 is the utility model monostable trigger line graph,

Fig. 5 is the utility model work synoptic diagram.

1 is rotary encoder among Fig. 1; 2 is phase detector, and with A, the B phase pulse signal becomes the directivity pulse signal, during forward, pulse signal DN is arranged for high on the UP, in the time of oppositely, pulse signal UP is arranged for high on the DN; 3 is 74LS192 counter array (4), is used for cumulative encoder device umber of pulse; 4 is 74LS374 register array (2), is used for the latch pulse number; 5 is the 80196KC single machine unit, is used for calibration, calculating and demonstration and takes measurement of an angle; 6 is photoelectric sensor, is used to detect the zero degree cursor; 7 is monostable trigger, is used to produce Fixed width pulse (10 μ s), and wherein Q1 is used to control the data that 74LS374 latchs 74LS192, and Q2 is used for interrupting to the single-chip microcomputer application, and Q2 is used for the zero clearing to 74LS192.

U among Fig. 2 _1A, U _1B, U _1C, U _1DBe Schmidt trigger, model is 74HC14; U _2A, U _2B, U _2C, U _2DBe XOR gate, model is 74LS136; U _3A, U _3B, U _3CBe d type flip flop, model is 74LS74; U _4A, U _4BFor or the door, model is 74LS02; U5 is a reverser, and model is 74LS04; R-C delay circuit parameter (R=10K Ω, C=1Nf).

When having provided measured axis forward rotation and backward rotation among Fig. 3, the voltage sequential that circuit is mainly put.During forward rotation, DIR is a low level, and pulse is arranged on the UP, and during backward rotation, DIR is a high level, and pulse is arranged on the DN.

Among Fig. 4 last two monostable triggers of a slice MC14538, R1=R3=10K Ω wherein, R2=R4=1K Ω, C1=C2=100PF.The pulse width that monostable trigger produces is 10 μ s.

1 rotary encoder among Fig. 5,8 angel measuring instruments, 9 display windows, 10 operating keys, 11 pilot lamp, 6 photoelectric sensors, 12 measured axises, 13 belts.

(5). embodiment

As shown in Figure 5:

Rotary encoder 1 is installed on the motor shaft, and motor shaft and measured axis (rotor) 12 is in transmission connection by belt 13.When motor shaft rotated, there was the fixed engagement ratio in rotary encoder with measured axis, and when measured axis rotated, rotary encoder produced the A of dutycycle 50%, B two-phase pulse, mutually leading 90 degree of A during forward rotation, mutually leading 90 degree of B during backward rotation.Paste a light mark in the zero degree position of measured axis, when the light mark turned over photoelectric sensor, a photoelectric sensor positive pulse of output also sent instrument to.

After (A, B) phase signals enters instrument, at first enter a phase detector circuit.The effect of phase detector circuit is a sense of rotation of distinguishing measured axis with time-delay and logical circuit.When the measured axis forward rotation, at the UP of phase detector end output pulse, DN end output high level; When the measured axis backward rotation, at the DN of phase detector output terminal output pulse signal, UP end output high level.Wherein phase detector by four Schmidt triggers, four XOR gate, three d type flip flops, two or and a not gate form.Utilize R-C to form, judge sense of rotation with the two-way time delayed signal again, thereby produce UP forward, DN reverse impulse signal.

The UP output terminal of phase detector is connected with UP, the DN input end of 74LS192 counter array with the DN output terminal.The 74LS192 counter array is that 4 74Ls192 are concatenated into 16 bit serial counters, can count the umber of pulse of 0-65535 scope.74LS192 counter array and line output are connected with two 74LS374 registers, and 74LS374 can latch the sixteen bit data of 74LS192 array at any time.Two 74LS374 are connected with single machine unit in the parallel port mode, and single machine unit can read the pulse data that 74LS374 latchs at any time, calculate and demonstration measured axis angle.

Single machine unit is to be core with 80196KC, and 1 6264 8K random memory, 1 27C64 8K memory under program, 1 28c16 2K electric erasable read-only memory are in addition with 8 peripheral hardware control of 74Ls138 expansion mouth.

Form two monostable triggers with 1 MC14538, the pulse that produces 10 μ s at the rising edge of input.The zero degree pulse signal of photoelectric sensor sense output inputs to monostable trigger 1, produce Fixed width pulse (10 μ s), trigger 74374 with Q1 and latch 74192 umber of pulse, trigger monostable trigger 2 simultaneously with Q1 again, produce Fixed width pulse (10 μ s), to the 74LS192 zero clearing, 80196KC is applied for interrupting (INT1) with Q2 with Q2.

80196KC is receiving interrupt INT 1, reads the 74LS374 latched data, and it circles for measured axis, the umber of pulse of rotary encoder output, and promptly all umber of pulse N, single-chip microcomputer reads N, and storage.Read pulse value later on when being n, then angle is $\mathrm{\φ}=\frac{360n}{N}$

After single-chip microcomputer calculates angle Φ, on the display window shown in Fig. 5, show.Among Fig. 5 on the instrument panel operating key 10 be used for calibration, measure operating key, pilot lamp 11 is used for calibration, measures indication.

Claims (2)

1. angel measuring instrument, it is characterized in that by rotary encoder, single-chip microcomputer, phase detector, counter, register, photoelectric sensor, monostable trigger is formed, in the middle of rotary encoder and single-chip microcomputer, be connected with phase detector, counter, register, the UP of the UP output terminal of phase detector and DN output terminal and 74LS192 counter array, the DN input end connects, 74LS192 counter array and line output, be connected with two 74LS374 registers, two 74LS374 link to each other with single machine unit in the parallel port mode, link with the monostable trigger that produces the Fixed width pulse at the other end of single-chip microcomputer and the photoelectric sensor of detection zero degree cursor.

2. angel measuring instrument according to claim 1, it is characterized in that said phase detector by four Schmidt triggers, four different formula doors, three d type flip flops, two or and a not gate form, utilize R-C to form delay circuit, judge sense of rotation with the two-way time delayed signal again, thereby produce UP direct impulse signal and DN reverse impulse signal.

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