CN208109153U - Photoelectric shaft encoder detector - Google Patents

Abstract

The utility model discloses a detector for a photoelectric shaft angle encoder, which comprises a signal processing module connected with the photoelectric encoder to be tested for processing the signal output by the photoelectric encoder into a signal suitable for detection; an interface module; and a signal conditioning module , connected with the interface module, used for shaping and filtering the different coded signals output by the photoelectric encoder; the control and detection module, connected with the signal conditioning module and the interface module, used for processing by the signal conditioning module The encoded signal and the signal transmitted by the interface module are discriminated and angular velocity is measured. The detector of the photoelectric shaft-angle encoder of the utility model can detect the output performance of the equipped photoelectric shaft-angle encoder, detect whether the output pulse number of the encoder is normal, and measure the angular velocity of the encoder; , Reverse the two pulse signals for discrimination; measure the amplitude of the pulse signal, and display the detected waveform in real time through the display module.

Description

A Photoelectric Shaft Angle Encoder Detector

technical field

The utility model relates to the technical field of weapon equipment detection, in particular to a photoelectric shaft angle encoder detector.

Background technique

The photoelectric shaft encoder used in the equipment is mainly used to detect the rotation direction, rotation angle and rotation speed of the rotary parts, and it is widely used in this series of equipment. A photoelectric shaft encoder is a device used to generate angular position signals and convert angular displacement or linear displacement into electrical signals. In the process of use, the failure rate of the photoelectric shaft encoder in the equipment is relatively high. When repairing, it is often impossible to accurately locate the fault and judge whether the photoelectric shaft encoder is good or bad. Therefore, there is an urgent need to develop a set of photoelectric shaft encoder detectors that can accurately and quickly locate faults, which can effectively reduce maintenance costs.

Utility model content

The technical problem to be solved by the utility model is to provide a photoelectric shaft angle encoder detector capable of accurate and rapid fault location, which can effectively reduce the maintenance cost.

The technical solution of the utility model can be realized through the following technical measures: a photoelectric shaft angle encoder detector, including a signal processing module, connected with the photoelectric encoder to be tested, and used to process the signal output by the photoelectric encoder to be suitable for detection Signals, including photoelectric encoder signal processing unit, data conversion unit, digital signal processing unit;

The interface module is connected with the signal processing module, and is used to realize that the detector detects different types of photoelectric encoders;

The signal conditioning module is connected with the interface module, and is used for shaping and filtering the different encoded signals output by the photoelectric encoder, and sending them to the control and detection module;

The control and detection module is connected with the signal conditioning module and the interface module, and is used for distinguishing and measuring the angular velocity of the coded signal processed by the signal conditioning module and the signal transmitted by the interface module.

Further, the photoelectric encoder signal processing unit includes a digital signal extraction circuit, a conversion circuit and an amplification circuit;

The photoelectric encoder signal processing unit is used to convert the optical signal output by the photoelectric encoder into an electrical signal, process the electrical signal and output it to the data conversion unit;

The data conversion unit is used to receive the electrical signal processed by the photoelectric encoder signal processing unit and convert it into a digital signal;

The digital signal processing unit is used to receive the digital signal and convert it into a detection signal and send it to the interface module.

Preferably, the signal conditioning module includes a pulse unit and a direction discrimination unit;

The pulsating unit is connected to the direction discriminating unit, and is used for shaping the two-way sine waves output by the photoelectric encoder to generate a square wave signal;

The direction judging unit is used to process the square wave signal, and send the obtained counting square wave signal and direction signal to the control and detection module for measurement.

Preferably, the control and detection module includes an Arduino Due microcontroller, and the Arduino Due microcontroller adopts a microcontroller board modeled as Atmel SAM3X8E CPU.

The utility model also includes a self-inspection module connected with the interface module, the self-inspection module includes a single-chip microcomputer, which is used to generate a self-inspection signal through the single-chip microcomputer, and sends it to the control and detection module for pulse counting, so as to realize the Judgment of work performance.

Preferably, the utility model also includes a power supply module, which is used for stepping down and stabilizing the power supply for the detector, and providing a working voltage for the photoelectric encoder to be tested.

Preferably, the utility model also includes a display module connected with the control and detection module; the display module includes an LCD display screen, an LCD controller, a touch screen, a communication interface and an interface processing unit, and the communication interface is used for communicating with the external The control unit is connected to realize the human-computer interaction interface of the system; the LCD display is used to display the pulse number of the control and detection module in real time.

From the above, the detector of the photoelectric shaft angle encoder of the utility model can detect the output performance of the equipped photoelectric shaft angle encoder, detect whether the output pulse number of the encoder is normal, and measure the angular velocity of the encoder; Discriminate the forward and reverse pulse signals of the device; measure the amplitude of the pulse signal, and display the detected waveform in real time through the display module. Through different interface modules, the test of photoelectric shaft-angle encoders of various equipments can be realized, and it can also be extended to detect the shaft-angle encoders of other series of equipments.

Description of drawings

The utility model is further described by using the accompanying drawings, but the embodiments in the accompanying drawings do not constitute any limitation to the present utility model.

Fig. 1 is the structural block diagram of the photoelectric shaft angle encoder detector of preferred embodiment of the present utility model;

Fig. 2 is the structural block diagram of the signal conditioning module of the photoelectric shaft angle encoder detector of the preferred embodiment of the present invention;

Fig. 3 is the circuit diagram of the signal conditioning module of the photoelectric shaft angle encoder detector of the preferred embodiment of the present invention;

Fig. 4 is a detection interface diagram of the photoelectric shaft angle encoder detector in the preferred embodiment of the present invention.

Detailed ways

In order to make the utility model easier to understand, specific embodiments of the utility model will be further described below.

As shown in Figure 1, the photoelectric shaft angle encoder tester of the present invention is mainly composed of a battery 10, a power supply module 20, an interface module 30, a self-test module 40, a signal conditioning module 50, a control and detection module 60, a display module 70, The signal processing module 80 is composed, and the dotted line part is the photoelectric encoder to be tested, which does not belong to the detector.

The detector of the utility model is powered by a 9V battery 10, and the power supply module 20 performs step-down and stable voltage processing on the 9V power supply to provide working 5V voltage for each module and the photoelectric encoder to be tested. The signal processing module 80 is connected with the photoelectric encoder to be tested, and is used to process the signal output by the photoelectric encoder into a signal suitable for detection, including a photoelectric encoder signal processing unit 81, a data conversion unit 82, and a digital signal processing unit 83. The photoelectric encoder signal processing unit 81 is used to convert the optical signal output by the photoelectric encoder into an electrical signal and process the electrical signal and output it to the data conversion unit 82. The photoelectric encoder signal processing unit 81 includes digital A signal extraction circuit, a conversion circuit and an amplification circuit, wherein the conversion circuit converts the optical signal into an electrical signal, the digital signal extraction circuit is used for extracting the fine code and the rough code of the electrical signal, and the amplification circuit The fine code and the coarse code are enlarged and processed. The data conversion unit 82 receives the electrical signal processed by the photoelectric encoder signal processing unit 81 and converts it into a digital signal. The data conversion unit 82 includes a voltage comparator circuit and a signal fluctuation compensation circuit, and the voltage comparator circuit converts the The rough code and the fine code output by the photoelectric encoder signal processing unit 81 are transformed into digital signals, and converted into high-quality digital signals in conjunction with the compensation circuit, and the signal fluctuation compensation circuit compensates for the fluctuation of the digital signal, so as to Make up for data changes caused by temperature transformation and voltage transformation; finally, the data conversion unit 82 sends the high-quality digital signal to the digital signal processing unit 83 . The digital signal processing unit 83 is composed of an FPGA chip and its peripheral circuits. The digital signal processing unit 83 receives the digital signal and converts it into a detection signal and sends it to the interface module 30 .

The interface module 30 is connected with the signal processing module 80, which can realize the detection of photoelectric encoders equipped with different models by the real tester. CLKA and CLKB are two coded signals with a phase difference of 90° output by the photoelectric encoder processed by the signal processing module, and the signal conditioning module 50 is connected to the interface module 30 for shaping and filtering the two signals. processing, and finally sent to the control and detection module 60. The control and detection module 60 is connected with the signal conditioning module 50 and the interface module 30, and is used to realize the counting of the number of optical encoder pulses, the measurement of the amplitude, the discrimination of the forward and reverse pulse signals, and the determination of the angular velocity. The measurement is used to distinguish and measure the angular velocity between the coded signal processed by the signal conditioning module 50 and the signal transmitted by the interface module 30 .

As shown in Figure 2, the signal conditioning module 50 includes a pulse unit 51 and a direction discrimination unit 52, the pulse unit 51 is connected to the direction discrimination unit 52, and the CLKA output by the photoelectric encoder, the CLKB two-way sine wave signal Carry out shaping processing to become a square wave signal, and send it to the direction discrimination unit 52 for processing. After being processed by the direction judging unit 52, the counting square wave signal and the direction signal are respectively sent to the control and detection module 60 for measurement, and finally sent to the display module 70 for display. The signal conditioning module 50 is used for the conditioning of the detection signal. It mainly processes the sine wave signal to be tested in shaping and becomes a square wave signal, then sends it to the direction discrimination unit 52 for processing, and obtains the counting square wave signal (NUM) and the direction signal ( DIR) is sent to the control and detection module 60 for measurement. Figure 3 is a circuit diagram of the signal conditioning module, in which GAL20V8 is a general-purpose array logic device and a field programmable device. It can have up to 20 input pins and up to 8 output pins. It can not only realize the logic function of combinational logic, but also realize the logic function of sequential logic.

The control and detection module 60 of the photoelectric shaft angle encoder detector of the present utility model includes the newly developed Arduino Due microcontroller in Italy, and adopts a microcontroller board whose model is Atmel SAM3X8E CPU, which is the first 32-bit ARM core-based Arduino. Due with 32-bit ARM core is more powerful than other arduinos with 8-bit AVR core: 32-bit core can process 32-bit data in one clock. The microcontroller board includes 54 digital I/O pins (including 12 PWM outputs), 12 analog input channels, 2 analog output channels (DAC), and the total output current of the IO port is 130mA. 3.3V port output capacity is 800mA, 5V port output capacity is 800mA, Flash 512KB (all space can store user program), SRAM 96KB (two parts: 64KB and 32KB), clock rate 84MHz[4-5]. Since the working voltage of arduinodue is 3.3V. The loadable voltage of the IO port is also 3.3V, so the 5V pulse generated by the conditioning circuit cannot be directly processed. The detector shapes the 5V pulse into a 3.3V pulse through the sn74lvc4245 chip.

The utility model also includes a self-inspection module 40 connected with the interface module 30, and the self-inspection module 40 includes a single-chip microcomputer, which is used to generate a self-inspection signal by the single-chip microcomputer, and sends it to the control and detection module 50 for pulse counting , to realize the judgment of the working performance of the detector.

As shown in Figure 4, the utility model also includes a display module 70 connected to the control and detection module 60, and the display module 70 adopts a domestically developed programmable smart LCD (Programmable Smart LCD, PS-LCD for short). PS-LCD display module comprises LCD display screen, LCD controller, touch screen, communication interface and interface processing unit, the intelligent display module that interface processing unit and communication interface are formed in one, and described communication interface is used for and external control unit (such as : 51 single-chip microcomputers, ARM, DSP, PC, PLC, bus equipment, etc.) are connected to realize the human-computer interaction interface of the system; the LCD display is used to display the pulse number of the control and detection module in real time. PS-LCD uses JavaScript scripting language. JavaScript is the most popular scripting language on the Internet. It exists in all Web browsers in the world and can enhance the interaction between users and Web sites and Web applications. The display module 70 of the present invention displays the number of pulses collected and sent by the microcontroller in real time through script writing, and makes judgments. Use the LCD simulator to verify the interface effect and communication process, and repeat the previous steps until you are satisfied. As an advanced intelligent human-machine interface product, PS-LCD can easily and flexibly realize data interaction with an external control unit through a communication interface. Currently, PS-LCD supports two communication protocols: CTP (Cooky Talking Protocol) protocol and user-defined (UserDefine) protocol. The first communication protocol CTP protocol adopted by the detector of the utility model. In CTP communication mode, PS-LCD will execute immediately after receiving the communication command, and will return the result to the main controller after completion. Because the serial port communication protocol of PS-LCD is inconsistent with the communication protocol of microcontroller Arduino Due, it needs to be converted and controlled during the communication process. In order to cancel the automatic reply message of the PS-LCD command execution result, in the CTP communication mode, cancel the automatic reply of the PS-LCD by calling the ctpSet(“reply”, 0) function. At the same time, PS-LCD controls the work of the microcontroller through the serial port signal generated by the communication protocol, and truly realizes the effect of human-computer interaction. Generate the interface output file spf, and then download the spf file to the PS-LCD through the PS-LCD special software tool Flex to verify the final interface effect.

The utility model selects different models according to the photoelectric encoder to be tested, and different types of photoelectric encoders define different sending signals. Taking Type 1 photoelectric encoder as an example, the subroutine for selecting the script of the button is as follows:

pulse.text="";//Reset the number of pulse display//

result.text="";//clear pulse judgment result//

du.text="";//The angular velocity display result is cleared//

if(xinghao.currentIndex＝1)//select the first model//

sysCom0.write(0x43);//Send C control characters to the microcontroller//

else if(xinghao.currentIndex＝2)//select the second model//

sysCom0.write(0x44);//Send C control characters to the microcontroller//

………twenty two

Among them, sysCom0.write(0x43) is to write into the serial port sending buffer, and the serial port sends a byte of data 0x43 to the outside, which is the character 'C'. When the Arduino micro-control board receives the 'C' character sent from the serial port, it can determine the type I photoelectric encoder to be tested, and start the corresponding program for testing. Similarly, when the second type of test is selected, the Arduino micro-control board will receive the 'D' character sent from the serial port, then it can determine the type II photoelectric encoder to be tested, and start the corresponding program for testing.

In summary, the photoelectric shaft-angle encoder tester of the present utility model can detect the output performance of the equipped photoelectric shaft-angle encoder: 1. Detect whether the number of encoder output pulses is normal, and measure the Angular velocity; 2. Discriminate the forward and reverse pulse signals of the encoder; 3. Measure the amplitude of the pulse signal. 4. Display the detected waveform in real time through the display module. 5. Through different interface modules, the test of photoelectric shaft-angle encoders of various equipments can be realized, and it can also be extended to test the shaft-angle encoders of other series of equipment.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model rather than limiting the protection scope of the present utility model. Although the utility model has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art It should be understood that the technical solution of the utility model can be modified or equivalently replaced without departing from the essence and scope of the technical solution of the utility model.

Claims (8)

1. A photoelectric shaft angle encoder detector, characterized in that, comprising: The signal processing module is connected with the photoelectric encoder to be tested, and is used to process the signal output by the photoelectric encoder into a signal suitable for detection, including a photoelectric encoder signal processing unit, a data conversion unit, and a digital signal processing unit; The interface module is connected with the signal processing module, and is used to realize that the detector detects different types of photoelectric encoders; The signal conditioning module is connected with the interface module, and is used for shaping and filtering the different encoded signals output by the photoelectric encoder, and sending them to the control and detection module; The control and detection module is connected with the signal conditioning module and the interface module, and is used for distinguishing and measuring the angular velocity of the coded signal processed by the signal conditioning module and the signal transmitted by the interface module. 2. The photoelectric shaft angle encoder tester according to claim 1, wherein the photoelectric encoder signal processing unit comprises a digital signal extraction circuit, a conversion circuit and an amplification circuit; The photoelectric encoder signal processing unit is used to convert the optical signal output by the photoelectric encoder into an electrical signal, process the electrical signal and output it to the data conversion unit; The data conversion unit is used to receive the electrical signal processed by the photoelectric encoder signal processing unit and convert it into a digital signal; The digital signal processing unit is used to receive the digital signal and convert it into a detection signal and send it to the interface module. 3. The photoelectric shaft angle encoder tester according to claim 1, wherein the signal conditioning module includes a pulse unit and a direction discrimination unit; The pulsating unit is connected to the direction discriminating unit, and is used for shaping the two-way sine waves output by the photoelectric encoder to generate a square wave signal; The direction judging unit is used to process the square wave signal, and send the obtained counting square wave signal and direction signal to the control and detection module for measurement. 4. The photoelectric shaft angle encoder tester according to claim 1, wherein the control and detection module comprises an Arduino Due microcontroller. 5. The photoelectric shaft angle encoder detector according to claim 4, wherein the Arduino Due microcontroller adopts a microcontroller board that is an Atmel SAM3X8E CPU. 6. The photoelectric shaft angle encoder tester according to claim 1, further comprising a self-test module connected to the interface module, the self-test module comprising a single-chip microcomputer for generating self-test by the single-chip microcomputer The signal is sent to the control and detection module for pulse counting to realize the judgment of the working performance of the detector. 7. The photoelectric shaft angle encoder tester according to claim 1, further comprising a power supply module for stepping down and stabilizing the power supply for the tester to provide work for the photoelectric encoder to be tested Voltage. 8. The photoelectric shaft angle encoder tester according to claim 1, further comprising a display module connected to the control and detection module; The display module includes an LCD display screen, an LCD controller, a touch screen, a communication interface and an interface processing unit, and the communication interface is used to connect with an external control unit to realize a human-computer interaction interface of the system; the LCD display screen is used for real-time Display the number of pulses of the control and detection module.