A synchronous pulse generating device based on infrared photoelectric sensor

Abstract

The present invention discloses a synchronous pulse generating device based on an infrared photoelectric sensor, comprising a photoelectric converter and a photoelectric probe connected to the photoelectric converter. The photoelectric probe is installed inside the device, and the cable of the photoelectric probe is connected to the photoelectric converter installed outside the device via an adapter plug. The device is then started, and the power module of the photoelectric converter outputs a 5V voltage level to the infrared transmitting tube of the photoelectric probe. The infrared receiving tube of the photoelectric probe senses the surface mark of the rotating component being detected and generates a corresponding photocurrent signal. The photocurrent signal is sent to an operational amplifier, which converts the photocurrent signal into a corresponding voltage signal. The voltage signal is then converted into a pulse signal synchronized with the mark through a voltage comparator and finally output through an optocoupler. A sensitivity adjustment knob is provided in the conversion circuit for adjusting the sensitivity of the infrared receiving tube. The present invention can identify the surface mark of the rotating component inside the device and convert the surface mark of the rotating component into a synchronous pulse output.

Description

Technical Field

[0001] The invention belongs to the technical field of sensors and pulse generating devices, and in particular relates to a synchronous pulse generating device based on an infrared photoelectric sensor. Background Art

[0002] A wide variety of photoelectric detection devices are currently available on the international and domestic markets for marking detection. However, none of these devices meet the requirements for surface marking detection in specialized equipment. This is due to the limited internal installation space of specialized equipment. The detection device's probe must be separated from the conversion circuit, and the entire detection device must not affect the vacuum operating environment of the specialized equipment. No single product on the market meets these requirements.

[0003] The present invention is proposed to solve the problem of separation between the probe and the circuit of the detection device. The ultimate goal is to provide a device that can be installed inside a dedicated device, can identify the surface markings of rotating parts inside the device, and convert the surface markings of the rotating parts into synchronous pulses. Summary of the Invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a synchronization pulse generating device based on an infrared photoelectric sensor, which is used to identify the surface markings of rotating parts inside the equipment and convert the surface markings of the rotating parts into synchronization pulses.

[0005] The present invention is achieved through the following technical solutions:

[0006] A synchronous pulse generating device based on an infrared photoelectric sensor includes a photoelectric converter and a photoelectric probe connected to the photoelectric converter;

[0007] The housing of the photoelectric converter is provided with a sensitivity adjustment knob, a first terminal for connecting power supply and pulse output, and a second terminal for connecting the photoelectric probe. The housing of the photoelectric converter is provided with a conversion circuit.

[0008] The photoelectric probe includes an infrared emitting tube and an infrared receiving tube, the cathode of the infrared emitting tube is electrically connected to the anode of the infrared receiving tube, serving as a common terminal of the transmitting and receiving devices, the common terminal and the anode of the infrared emitting tube and the cathode of the infrared receiving tube are respectively connected to cables, and the cables are connected to the second terminal on the photoelectric converter through an adapter plug; the second terminal includes three connection points, the first connection point is a DC5V terminal for connecting to the anode of the infrared emitting tube of the photoelectric probe, the second connection point is a DC5V ground terminal for connecting to the common terminal of the photoelectric probe, and the third connection point is a detection signal input terminal of the photoelectric probe, for connecting to the cathode of the infrared receiving tube of the photoelectric probe;

[0009] The conversion circuit includes a power module, a sensitivity adjustment knob, an operational amplifier, a voltage comparator and an optocoupler. The DC5V output end of the power module is connected to the first point of the second terminal, and the DC5V ground end of the power module is connected to the second point of the second terminal; the - end of the operational amplifier is connected to the middle connection point of the adjustable resistor R2, and the two end connections of the adjustable resistor R2 are respectively connected to the DC5V and DC5V ground ends. The adjustment knob of the adjustable resistor R2 is the sensitivity adjustment knob set on the housing of the photoelectric converter. The + end of the operational amplifier is connected to the resistor R3. The resistor R3 The other end of the voltage comparator is connected to the third point of the second terminal and the adjustable resistor R1, and the other end of the adjustable resistor R1 is connected to DC5V; the output end of the operational amplifier is connected to the + end of the voltage comparator, and a resistor R4 is connected in series between the output end and the + end of the operational amplifier, the - end of the voltage comparator is connected to the resistor R5 and then to DC5V, and the - end of the voltage comparator is connected to the resistor R6 and then to the DC5V ground, the output end of the voltage comparator is connected to the cathode input end of the optocoupler through the resistor R8, the anode input end of the optocoupler is connected to DC5V, and the two output ends of the optocoupler are correspondingly connected to the first terminal;

[0010] When in use, install the photoelectric probe inside the device, connect the cable of the photoelectric probe to the photoelectric converter installed outside the device through an adapter plug, and connect the first terminal for power supply and pulse output on the photoelectric converter. Start the device, and the power module of the photoelectric converter outputs a DC5V level to the infrared emitting tube of the photoelectric probe. The infrared emitting tube remains always on, and the infrared receiving tube of the photoelectric probe senses the surface mark of the rotating part to be detected and generates a corresponding photocurrent signal. The photocurrent signal will be sent to the operational amplifier, and the photocurrent signal will be converted into a corresponding voltage signal. The voltage signal is then converted into a pulse signal synchronized with the mark through a voltage comparator and finally output through an optocoupler; the sensitivity adjustment knob in the conversion circuit is used to adjust the sensitivity of the infrared receiving tube. By adjusting the sensitivity of the receiving tube, the voltage generated by the background of the rotating part to be detected is adjusted to below the trigger threshold voltage, and the voltage generated by the mark is higher than the trigger threshold.

[0011] In the above technical solution, the wavelength of the infrared emitting tube is 940nm, the diameter is Φ5mm, and the half-power angle is 20°.

[0012] In the above technical solution, the infrared receiving tube has a central wavelength of 940nm, is Φ5mm black, and has a photosensitive current of 85uA.

[0013] In the above technical solution, the infrared emitting tube and the infrared receiving tube are fixedly installed side by side in the cylindrical probe base.

[0014] In the above technical solution, the power supply module is used to convert the input DC24V into a stable DC5V, and its DC24V input end is connected to the first point of the first terminal, and its DC24V ground end is connected to the second point of the first terminal, so that an external DC24V input power supply is connected through the first and second points of the first terminal, and DC5V is output through the power supply module.

[0015] In the above technical solution, the two output ends of the optocoupler are correspondingly connected to the third point and the fourth point of the first wiring terminal.

[0016] In the above technical solution, the power module model is the Nengda B2405-1W isolated power module.

[0017] In the above technical solution, the background of the detected rotating component is white and the mark is a black bar.

[0018] The advantages and beneficial effects of the present invention are:

[0019] The present invention provides a synchronous pulse generating device based on an infrared photoelectric sensor. The device includes two separate parts: a photoelectric converter and a photoelectric probe. The photoelectric probe is small in size and simple in structure and can be installed in the vacuum equipment to be detected. The cable of the photoelectric probe is connected to the photoelectric converter outside the equipment through an adapter plug, which does not affect the vacuum operating environment of the equipment.

[0020] The invention can identify the surface identification of the rotating component inside the equipment and convert the surface identification of the rotating component into a synchronous pulse output.

[0021] The technical indicators of the present invention are as follows:

[0022] Rotating part identification shape: bar

[0023] Rotating parts identification type: black and white

[0024] Detection distance: 10mm-50mm

[0025] Response speed: 80us

[0026] Signal conversion method: convert the bar logo into a synchronous pulse signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 Schematic diagram of the appearance of the photoelectric converter body in the present invention;

[0028] Figure 2 It is a schematic diagram of the connection structure of the photoelectric probe in the present invention;

[0029] Figure 3 is a circuit diagram of a power module of a conversion circuit in the present invention;

[0030] Figure 4 1 is a circuit diagram of the conversion circuit in the present invention.

[0031] In the figure: 1 is the first terminal, 2 is the second terminal, 3 is the infrared transmitting tube, 4 is the infrared receiving tube, 5 is the power module, 6 is the sensitivity adjustment knob, 7 is the operational amplifier, 8 is the comparator, and 9 is the optocoupler.

[0032] For ordinary technicians in this field, other relevant drawings can be obtained based on the above drawings without any creative work. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions of the present invention are further described below with reference to specific embodiments.

[0034] A synchronous pulse generating device based on an infrared photoelectric sensor comprises a photoelectric converter and a photoelectric probe connected to the photoelectric converter.

[0035] See attached Figure 1 , is a schematic diagram of the appearance of the photoelectric converter. The housing of the photoelectric converter is provided with a sensitivity adjustment knob 6, a first terminal 1 for connecting the power supply and pulse output, and a second terminal 2 for connecting the photoelectric probe. A conversion circuit is provided inside the housing of the photoelectric converter.

[0036] See attached Figure 2 , is a schematic diagram of the structure of a photoelectric probe. The photoelectric probe includes an infrared emitting tube 3 and an infrared receiving tube 4. The infrared emitting tube 3 has a wavelength of 940 nm, a diameter of 5 mm, and a half-power angle of 20°. The infrared receiving tube 4 has a center wavelength of 940 nm, is 5 mm black, and has a photosensitive current of 85 uA. The infrared emitting tube 3 and the infrared receiving tube 4 are fixed side by side in the cylindrical probe base. The cathode of the infrared emitting tube 3 is electrically connected to the anode of the infrared receiving tube 4, serving as the common terminal for the transmitting and receiving devices. This common terminal, as well as the anode of the infrared emitting tube 3 and the cathode of the infrared receiving tube 4, are connected to cables. The cables are connected to the second terminal 2 on the photoelectric converter via an adapter plug. The second terminal 2 has three connection points: the first is a DC5V terminal for connecting to the anode of the infrared emitting tube 3 of the photoelectric probe; the second is a DC5V ground terminal for connecting to the common terminal of the photoelectric probe; and the third is the detection signal input terminal for the photoelectric probe, which is connected to the cathode of the infrared receiving tube 4 of the photoelectric probe.

[0037] See attached Figure 3 and 4 , is a circuit diagram of a conversion circuit, which includes a power supply module 5, a sensitivity adjustment knob 6, an operational amplifier 7, a voltage comparator 8 and an optocoupler 9.

[0038] The power module 5, whose model is Nengda B2405-1W isolated power module, is used to convert the input DC24V into a stable DC5V. Its DC24V input end is connected to the first point of the first terminal 1 of the photoelectric converter, and its DC24V ground end is connected to the second point of the first terminal 1, so that an external DC24V input power supply is connected through the first and second points of the first terminal, and DC5V is output through the power module 5. The DC5V output end of the power module 5 is connected to the first point of the second terminal 2, and the DC5V ground end of the power module 5 is connected to the second point of the second terminal 2.

[0039] The - end of the operational amplifier 7 is connected to the middle connection point of the adjustable resistor R2, and the two end connections of the adjustable resistor R2 are respectively connected to DC5V and DC5V ground. The adjustment knob of the adjustable resistor R2 is the sensitivity adjustment knob 6 set on the housing of the photoelectric converter; the + end of the operational amplifier 7 is connected to the resistor R3, and the other end of the resistor R3 is connected to the third point of the second terminal 2 and the adjustable resistor R1 (as mentioned above, the third point of the second terminal 2 is the detection signal input end of the photoelectric probe, thereby inputting the detection signal into the conversion circuit). The other end of resistor R1 is connected to DC5V; the output end of the operational amplifier 7 is connected to the + end of the voltage comparator 8, and a resistor R4 is connected in series between the output end and the + end of the operational amplifier 7. The - end of the voltage comparator 8 is connected to the resistor R5 and then to DC5V, and the - end of the voltage comparator 8 is connected to the resistor R6 and then to the DC5V ground. The output end of the voltage comparator 8 is connected to the cathode input end of the optocoupler 9 through the resistor R8, and the anode input end of the optocoupler 9 is connected to DC5V. The two output ends of the optocoupler 9 are correspondingly connected to the third point and the fourth point of the first terminal 1.

[0040] When using, Figure 2The photoelectric sensor is installed inside the device. Connect the sensor cable to the photoelectric converter via an adapter plug, and connect the first terminal on the converter for power supply and pulse output. The device is then powered on. Under normal operating conditions, the power module in the conversion circuit outputs a 5V DC voltage to the photoelectric sensor's infrared emitting diode 3, which remains lit. The infrared receiving diode 4 in the photoelectric sensor senses the surface mark on the rotating component being detected, generating a corresponding photocurrent signal. This photocurrent signal is then transmitted to an operational amplifier 7, which converts the photocurrent signal into a corresponding voltage signal. A voltage comparator 8 then converts the voltage signal into a pulse signal synchronized with the mark, which is then output through an optocoupler 9. The sensitivity adjustment knob 6 in the conversion circuit is primarily used to adjust the sensitivity of the infrared receiving diode. In actual use, the background brightness of the detected mark varies, resulting in varying photocurrent levels. Therefore, the sensitivity of the receiving diode must be adjusted to keep the voltage generated by the background below the trigger threshold voltage and the voltage generated by the mark above the trigger threshold. Typically, the mark background is white and the mark is a black bar. For backgrounds of the same material and color, the sensitivity is fixed.

[0041] Furthermore, the value of the adjustable resistor R1 depends on the background (the stronger the background reflected light, the more appropriately the value of the adjustable resistor R1 needs to be lowered). Generally, once the background is determined, the value of the adjustable resistor R1 is determined, so there is no need to set its adjustment knob on the housing of the photoelectric converter. The adjustable resistor R1 is pre-adjusted and determined directly on the internal circuit board of the photoelectric converter.

[0042] For ease of explanation, spatial relative terms such as "upper", "lower", "left", and "right" are used in the embodiments to illustrate the relationship between one element or feature shown in the figures and another element or feature. It should be understood that, in addition to the orientation shown in the figures, spatial terms are intended to include different orientations of the device in use or operation. For example, if the device in the figure is inverted, the element described as being "under" other elements or features will be positioned "above" other elements or features. Therefore, the exemplary term "under" can include both upper and lower orientations. The device can be positioned in other ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used here can be interpreted accordingly.

[0043] Moreover, relational terms such as “first” and “second” are merely used to distinguish one component from another having the same name, but do not necessarily require or imply any actual relationship or order between these components.

[0044] The above is an exemplary description of the present invention. It should be noted that, without departing from the core of the present invention, any simple deformation, modification or other equivalent replacement that can be made by other skilled in the art without expending creative labor falls within the scope of protection of the present invention.

Claims

1. A method for using a synchronous pulse generating device based on an infrared photoelectric sensor, characterized in that: including a photoelectric converter and a photoelectric probe connected to the photoelectric converter; The housing of the photoelectric converter is provided with a sensitivity adjustment knob, a first terminal for connecting power supply and pulse output, and a second terminal for connecting the photoelectric probe. The housing of the photoelectric converter is provided with a conversion circuit. The photoelectric probe includes an infrared emitting tube and an infrared receiving tube, the cathode of the infrared emitting tube is electrically connected to the anode of the infrared receiving tube, serving as a common terminal of the transmitting and receiving devices, the common terminal and the anode of the infrared emitting tube and the cathode of the infrared receiving tube are respectively connected to cables, and the cables are connected to the second terminal on the photoelectric converter through an adapter plug; the second terminal includes three connection points, the first connection point is a DC5V terminal for connecting to the anode of the infrared emitting tube of the photoelectric probe, the second connection point is a DC5V ground terminal for connecting to the common terminal of the photoelectric probe, and the third connection point is a detection signal input terminal of the photoelectric probe, for connecting to the cathode of the infrared receiving tube of the photoelectric probe; The conversion circuit includes a power module, a sensitivity adjustment knob, an operational amplifier, a voltage comparator and an optocoupler. The DC5V output end of the power module is connected to the first point of the second terminal, and the DC5V ground end of the power module is connected to the second point of the second terminal; the - end of the operational amplifier is connected to the middle connection point of the adjustable resistor R2, and the two end connections of the adjustable resistor R2 are respectively connected to the DC5V and DC5V ground ends. The adjustment knob of the adjustable resistor R2 is the sensitivity adjustment knob set on the housing of the photoelectric converter. The + end of the operational amplifier is connected to the resistor R3. The resistor R3 The other end of the voltage comparator is connected to the third point of the second terminal and the adjustable resistor R1, and the other end of the adjustable resistor R1 is connected to DC5V; the output end of the operational amplifier is connected to the + end of the voltage comparator, and a resistor R4 is connected in series between the output end and the + end of the operational amplifier, the - end of the voltage comparator is connected to the resistor R5 and then to DC5V, and the - end of the voltage comparator is connected to the resistor R6 and then to the DC5V ground, the output end of the voltage comparator is connected to the cathode input end of the optocoupler through the resistor R8, the anode input end of the optocoupler is connected to DC5V, and the two output ends of the optocoupler are correspondingly connected to the first terminal; When in use, install the photoelectric probe inside the device, connect the cable of the photoelectric probe to the photoelectric converter installed outside the device through an adapter plug, and connect the first terminal for power supply and pulse output on the photoelectric converter. Start the device, and the power module of the photoelectric converter outputs a DC5V level to the infrared emitting tube of the photoelectric probe. The infrared emitting tube remains always on, and the infrared receiving tube of the photoelectric probe senses the surface mark of the rotating part to be detected and generates a corresponding photocurrent signal. The photocurrent signal will be sent to the operational amplifier, and the photocurrent signal will be converted into a corresponding voltage signal. The voltage signal is then converted into a pulse signal synchronized with the mark through a voltage comparator and finally output through an optocoupler; the sensitivity adjustment knob in the conversion circuit is used to adjust the sensitivity of the infrared receiving tube. By adjusting the sensitivity of the receiving tube, the voltage generated by the background of the rotating part to be detected is adjusted to below the trigger threshold voltage, and the voltage generated by the mark is higher than the trigger threshold.

2. The method for using the synchronous pulse generating device based on the infrared photoelectric sensor according to claim 1, characterized in that: The infrared emitting tube has a wavelength of 940 nm, a diameter of Φ5 mm, and a half-power angle of 20°.

3. The method for using the synchronous pulse generating device based on the infrared photoelectric sensor according to claim 1, characterized in that: The infrared emitting tube and the infrared receiving tube are fixedly installed side by side in the cylindrical probe base.

4. The method for using the synchronous pulse generating device based on the infrared photoelectric sensor according to claim 1, characterized in that: The power supply module is used to convert the input DC24V into a stable DC5V. Its DC24V input end is connected to the first point of the first terminal, and its DC24V ground end is connected to the second point of the first terminal, so that an external DC24V input power supply is connected through the first and second points of the first terminal, and DC5V is output through the power supply module.

5. The method for using the synchronous pulse generating device based on the infrared photoelectric sensor according to claim 4, characterized in that: The two output ends of the optocoupler are correspondingly connected to the third point and the fourth point of the first wiring terminal.

6. The method for using the synchronous pulse generating device based on the infrared photoelectric sensor according to claim 1, characterized in that: The power module model is the Nengda B2405-1W isolated power module.

7. The method for using the synchronous pulse generating device based on the infrared photoelectric sensor according to claim 1, characterized in that: The background of the detected rotating part is white.

8. The method for using the synchronous pulse generating device based on the infrared photoelectric sensor according to claim 7, characterized in that: The symbol is a black bar.

Images