Multi-mode full-view spark detector based on photoelectric sensor

Abstract

The invention provides a multimode full-view spark detector based on a photoelectric sensor, and belongs to the technical field of dust explosion-proof safety. The device comprises a detector shell provided with an end cover and a window, a plurality of photoelectric sensors, a signal function board card, a power supply function board card and a single chip microcomputer, the plurality of photoelectric sensors are sensitive to wave bands of 800-1700nm, and when a monitored area generates a photosensitive signal, the photoelectric conversion circuit is triggered to realize signal access; the signal enters a data acquisition port of the single chip microcomputer after being processed by an internal board card, and data acquisition, data processing, data judgment and output control are completed in the single chip microcomputer through an RT-Tread real-time operating system; the outer shell is mainly composed of spherical glass, a shielding cover, a shell body, an end cover and the like, the two photoelectric sensors are placed in a spherical window according to a certain angle, detection areas of the two photoelectric sensors are interwoven to form a detection net, the detection net covers the whole cross section direction in a pipeline, and a full-view-angle detection area is formed in the pipeline.

Description

Technical Field

[0001] The invention belongs to the technical field of dust explosion-proof safety, and in particular relates to a multi-mode full-viewing angle spark detector based on a photoelectric sensor. Background Art

[0002] In industrial production, sparks often cause fires and explosions, resulting in significant loss of life and property. In the production or handling of flammable materials, fires and explosions often occur in air ducts, bags, sanding, planing machines, drying, lifting hoppers and spiral conveyor belts. Sparks that cause most fires are most likely to be generated in automated production processes and dust transportation processes. As an active fire and explosion protection device, the spark detection and extinguishing system is the best solution to the above safety issues. It can detect sparks in process equipment or pipelines and extinguish them in time, thereby eliminating potential fire and explosion hazards.

[0003] Most spark detectors in the industry currently have blind spots, and detectors need to be installed in multiple directions to compensate for the lack of detection angles. This not only increases costs, but also causes abnormal phenomena such as false alarms and missed alarms in information processing due to information feedback from multiple detectors. At the same time, the sensitivity and response speed of the detectors are also the shortcomings of existing products. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a multi-mode full-viewing angle spark detector based on photoelectric sensors in view of the deficiencies in the prior art. The multi-mode full-viewing angle spark detector adopts multiple photoelectric sensors to realize full-viewing angle detection of 180° of the pipeline cross section. While expanding the viewing angle, it also improves the shortcoming of low sensitivity of a single sensor at a large angle. At the same time, redundant verification can be performed between the photoelectric sensors to make the detection accuracy and reliability higher, thereby solving the problems existing in the existing spark detection method.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a multi-mode full-view spark detector based on photoelectric sensors, including a detector housing provided with an end cover and a window, multiple photoelectric sensors, a signal function board, a power function board and a single-chip microcomputer; the end cover is a tail end sealing cover of the multi-mode full-view spark detector; the power function board is arranged on the inner side of the end cover of the detector housing, the signal function board and multiple photoelectric sensors are arranged in the detector housing, and the multiple photoelectric sensors are vertically welded on the signal function board with a bevel angle of 30°; the photoelectric sensor is an optical signal acquisition device, and the spark is converted into a current signal after passing through the photoelectric sensor and enters the signal function board, and then the single-chip microcomputer welded on the signal function board performs data acquisition and processing; the power function board supplies power to the signal function board and multiple photoelectric sensors through an external power supply.

[0006] Preferably, the multi-mode full-view spark detector further comprises a sealing gasket, a shielding cover, a spherical glass, a clamping ring, a front sealing gasket, a board fixing screw, and a connecting plug; the sealing gasket is placed between the end cover and the detector housing and is locked by a hexagon socket screw; the shielding cover is a fixing device for the signal function board and is fixed to the detector housing by the shielding cover fastening screw; the spherical glass is the detector housing window, i.e., the information receiving entrance of the photoelectric sensor, and is connected to the detector housing by a clamping ring; the clamping ring is used to fix the spherical glass, and the inner side is a curved surface design and is in contact with the glass The glass sphere is fixedly fitted, and the outer side is connected to the detector shell by gluing; the front end sealing gasket is fitted to the front end of the clamping ring, and is used to seal with the pipeline wall to prevent dust leakage when the spark detector is installed in a pipeline environment; the shielding cover fastening screws and the hexagon socket screws are both fastening components; the signal function board and the power function board are locked and fixed by the board fixing screws; the connecting plug is used for the external electrical interface of the multi-mode full-viewing angle spark detector, and the connecting plug is connected to the power function board through the wiring terminal, and the external power supply enters the power function board through the connecting plug.

[0007] Preferably, the multiple photoelectric sensors are placed crosswise to perform multi-mode and full-view detection of sparks, wherein the effective detection area of ​​a single photoelectric sensor is a 120° cone, and the multiple photoelectric sensors are placed symmetrically so that their detection areas are interwoven to form a detection network, covering the entire cross-sectional direction in the pipeline, that is, achieving a lateral detection angle of 180°. When a spark appears, the photoelectric sensor can convert the light signal into a current signal, and the signal function board amplifies, filters and shapes the current signal, and finally enters the single-chip microcomputer for data processing.

[0008] Preferably, the signal function board includes a signal processing circuit, a single-chip minimum system circuit, a signal trigger circuit and an output control circuit; the signal processing circuit performs response signal processing on the current signal output by the photoelectric sensor, that is, the voltage signal obtained after amplification, filtering and shaping by the signal processing circuit enters the analog quantity reading interface of the single-chip microcomputer welded on the signal function board, and the signal trigger circuit and the single-chip microcomputer make a joint judgment to make a corresponding signal output control; the signal trigger circuit inputs a low level voltage or a high level voltage to the single-chip microcomputer minimum system circuit interface according to the voltage signal value processed by the signal processing circuit; The system inside the single-chip microcomputer will choose whether to parse the voltage signal data by judging the high and low level voltages received at the single-chip microcomputer minimum system circuit interface; the output control circuit is the circuit for the external output signal of the spark detector, which is controlled by the single-chip microcomputer minimum system circuit, and the default is a no-spark state. The single-chip microcomputer minimum system output interface outputs a low level, and the output control circuit outputs a high level voltage; when the single-chip microcomputer determines that the signal received by the photoelectric sensor and processed by the signal processing circuit and entering the single-chip microcomputer input port is in a spark state, the single-chip microcomputer minimum system interface outputs a high level, and the output control circuit outputs a low level voltage.

[0009] Preferably, the single-chip microcomputer minimum system circuit is the data processing center of the signal function board. The light signal received by the photoelectric sensor enters the input port of the single-chip microcomputer minimum system circuit after being processed by the signal processing circuit. The real-time operating system inside the single-chip microcomputer minimum system circuit collects, processes and judges the current signal, and makes corresponding voltage signal output control based on the judgment result.

[0010] Preferably, the signal trigger circuit is composed of a comparator and peripheral capacitors and resistors, the positive input of the comparator is a voltage signal processed by the signal processing circuit, and the negative input of the comparator is a trigger threshold set by the single-chip microcomputer minimum system circuit. When the voltage signal value processed by the signal processing circuit is higher than the trigger threshold, the comparator outputs a high-level voltage to the single-chip microcomputer minimum system circuit interface; when the voltage signal value processed by the signal processing circuit is lower than the trigger threshold, the comparator outputs a low-level voltage to the single-chip microcomputer minimum system circuit interface.

[0011] Preferably, the signal processing circuit is composed of three operational amplifiers and peripheral capacitors and resistors. The current signal output by the photoelectric sensor is converted into a voltage signal by the first operational amplifier after being DC-isolated and filtered by the capacitor. The second operational amplifier amplifies the voltage signal, and the third operational amplifier adjusts the positive and negative voltage signals to positive voltage signals. The positive voltage signal passes through a resistor divider and a low-pass filter circuit composed of capacitors and resistors, and then a voltage signal that does not exceed the power supply voltage of the microcontroller is selected to enter the analog quantity reading interface of the microcontroller.

[0012] Preferably, the power function board includes a power filtering protection circuit, a step-down circuit and an isolation circuit; the external input voltage is connected to the plug and converted into a voltage that all chips in the power function board can operate, wherein the external input voltage enters the power function board through the electrical interface, is coupled, filtered and protected through inductors and capacitors, and is stepped down by the power management chip to provide power for the signal function board and multiple photoelectric sensors.

[0013] The beneficial effects of the above technical solution are as follows: the present invention provides a multi-mode full-view spark detector device based on a photoelectric sensor, which detects sparks in a multi-mode full-view by cross-placing two photoelectric sensors, wherein the photoelectric sensor is vertically welded on a signal function board with a bevel angle of 30°, and the effective window of a single photoelectric sensor is a cone with a 120° angle. The two photoelectric sensors are symmetrically placed so that their detection areas are interwoven to form a detection network, covering the entire cross-sectional direction in the pipeline, that is, reaching a horizontal detection angle of 180°, covering the full view in the cross section; the photoelectric sensor converts the optical signal into a current signal, and then the signal processing circuit in the signal function board processes the current signal, and the RT-Tread real-time operation device in the single-chip microcomputer performs data analysis, determines and gives a voltage signal output control, and the power function board connects an external DC24V through the 12V, ±8V and 3.3V step-down circuits in the power function board to provide power support for all components of the multi-mode full-view spark detector.

[0014] This device uses a multi-mode full-view monitoring structure to achieve 180° full-view detection of the cross-section inside the pipeline, so that the response time of the multi-mode full-view spark detector is less than 1ms and the current signal output control speed is less than 1ms; the function of this device is realized by the sparks collected by the photoelectric sensor at the front end of the multi-mode full-view spark detector, after conversion, amplification and shaping by the signal processing circuit, the RT-Tread real-time operating system is used in the single-chip microcomputer to collect, process and judge the data, and the linkage output is controlled according to the judgment result. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of the structure of a multi-mode full-viewing angle spark detector provided by an embodiment of the present invention;

[0016] Figure 2 A schematic diagram of a photoelectric sensor of a multi-mode full-viewing angle spark detector provided by an embodiment of the present invention;

[0017] Figure 3 Circuit diagram of a signal processing circuit and a signal triggering circuit provided by an embodiment of the present invention; wherein (a) is a signal processing circuit; (b) is a signal triggering circuit;

[0018] Figure 4A circuit diagram of a step-down circuit provided by an embodiment of the present invention; wherein (a) is a power supply filtering protection circuit; (b) is a step-down circuit;

[0019] Figure 5 A circuit diagram of an output control circuit provided by an embodiment of the present invention;

[0020] Figure 6 A circuit diagram of a single-chip computer minimum system circuit provided by an embodiment of the present invention;

[0021] In the figure: 1. end cover; 2. sealing gasket; 3. detector housing; 4. shielding cover; 5. spherical glass; 6. clamping ring; 7. front end sealing gasket; 8. shielding cover fastening screw; 9. signal function board; 10. board fixing screw; 11. hexagon socket screw; 12. connecting plug; 13. photoelectric sensor; 14. power supply function board; 15. pipeline. DETAILED DESCRIPTION

[0022] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0023] In this embodiment, a multi-mode full-view spark detector device based on a photoelectric sensor, such as Figure 1 As shown, it includes a detector housing 3 provided with an end cover 1 and a window, multiple photoelectric sensors 13, a signal function board 9, a power function board 14 and a single-chip microcomputer; the end cover 1 is a tail end sealing cover of the spark detector; the power function board 14 is arranged on the inner side of the end cover 1 of the detector housing 3, the signal function board 9 and multiple photoelectric sensors 13 are arranged in the detector housing 3, and the multiple photoelectric sensors 13 are vertically welded on the signal function board 9 with a bevel angle of 30°; the photoelectric sensor 13 is an optical signal acquisition device, and the spark is converted into a current signal after passing through the photoelectric sensor 13 and enters the signal function board 9, and then the single-chip microcomputer welded on the signal function board 9 performs data acquisition and processing; the power function board 14 supplies power to the signal function board 9 and multiple photoelectric sensors 13 through an external power supply.

[0024] In this embodiment, the multi-mode full-view spark detector is made of aluminum alloy, which is easy to process and shape. The overall structure is a variable cylinder, which is easy to use and maintain in actual working conditions. Its metal material also has a good shielding and protection effect on the photoelectric sensor 13 and the functional signal board 9. The signal function board 9 is placed inside the multi-mode full-view spark detector and fixed by a card slot.

[0025] In this embodiment, the multi-mode full-view spark detector also includes a sealing gasket 2, a shielding cover 4, a spherical glass 5, a clamping ring 6, a front sealing gasket 7, a shielding cover fastening screw 8, a board fixing screw 10, a hexagon socket screw 11 and a connecting plug 12; the end cover 1 is a sealing cover at the tail end of the spark detector, which is made of aluminum alloy and has a power function board 14 fixed on it; the sealing gasket 2 is placed between the end cover 1 and the detector housing 3 and is locked by the hexagon socket screw 11; the shielding cover 4 is a fixing device for the signal function board 9, and is fixed to the detector housing 3 by the shielding cover fastening screw 8; the spherical glass 5 is a window of the detector housing 3, that is, the information receiving entrance of the photoelectric sensor 13, and is connected to the detector housing through the clamping ring 6 3 are connected; the clamping ring 6 is used to fix the spherical glass 5, the inner side is a curved surface design and fixedly fitted with the spherical glass 5, and the outer side is connected to the detector housing 3 by gluing; the front end sealing gasket 7 is fitted on the front end of the clamping ring 6 and is used to seal with the wall of the pipe 15 to prevent dust leakage when the multi-mode full-viewing angle detector is installed in the pipeline 15 environment; the shielding cover fastening screws 8 and the hexagon socket screws 11 are both fastening components; the signal function board and the power function board are locked and fixed by the board fixing screws; the connecting plug 12 is used for the external electrical interface of the multi-mode full-viewing angle spark detector, the connecting plug 12 is connected to the power function board 14 through the wiring terminal, and the external power supply enters the power function board 14 through the connecting plug.

[0026] In this embodiment, the plurality of photoelectric sensors 13, such as Figure 2 As shown, it is an optical signal acquisition device. After passing through multiple photoelectric sensors 13, the spark is converted into a current signal and enters the signal function board 9, and then the single chip microcomputer performs data acquisition and processing; a cross-placement method is adopted to perform multi-mode full-view detection of the spark, wherein multiple photoelectric sensors 13 are vertically welded on the signal function board 9 with a bevel angle of 30°, wherein the effective detection area of ​​a single photoelectric sensor is a cone of 120°, and multiple photoelectric sensors 13 are symmetrically placed so that their detection areas are interwoven to form a detection network, covering the entire cross-sectional direction in the pipeline 15, that is, reaching a lateral detection angle of 180°, so as to achieve a full-view detection effect. The specific schematic diagram of the photoelectric sensor 13 is as follows Figure 2 As shown, the photoelectric sensor 13 is sensitive to sparks of 800 to 1700 nm. When a spark occurs, the photoelectric sensor 13 can convert the optical signal into a current signal, and the signal function board 9 amplifies, filters and shapes the current signal, and finally enters the single-chip microcomputer for data processing.

[0027] In this embodiment, the signal function board 9 includes: Figure 3 (a) The signal processing circuit shown in Figure 3 (b) The signal trigger circuit shown in Figure 5The output control circuit shown and Figure 6 The single-chip microcomputer minimum system circuit shown in the figure; when the photoelectric sensor 13 detects the passage of sparks, it will generate a current signal. The current signal will pass through the signal processing circuit and the signal trigger circuit will judge whether it meets the requirements and then enter the single-chip microcomputer. The single-chip microcomputer uses a real-time operating system to collect, process and judge the signal, and make corresponding voltage signal output control based on the judgment result; the signal trigger circuit inputs a low-level voltage or a high-level voltage to the single-chip microcomputer minimum system circuit interface according to the voltage signal value processed by the signal processing circuit; the system in the single-chip microcomputer will choose whether to parse the voltage signal data by judging the high and low-level voltages received at the single-chip microcomputer minimum system circuit interface; the output control circuit is the circuit for the external output signal of the spark detector, which is controlled by the single-chip microcomputer minimum system circuit, and is in a spark-free state by default. The single-chip microcomputer minimum system output interface outputs a low level, and the output control circuit outputs a high level voltage (24V); when the single-chip microcomputer determines that the signal received by the photoelectric sensor 13 and processed by the signal processing circuit and entering the single-chip microcomputer input port is in a spark state, the single-chip microcomputer minimum system interface outputs a high level, and the output control circuit outputs a low level voltage (0V).

[0028] The signal processing circuit 9 in this embodiment performs response signal processing on the current signal output by the photoelectric sensor 13, that is, after amplification, filtering and shaping by the signal processing circuit, it enters the analog quantity reading interface of the single-chip microcomputer welded on the signal function board 9, and the signal trigger circuit and the single-chip microcomputer make a joint judgment to make a corresponding signal output control; the signal processing circuit, such as Figure 3 As shown, it is composed of three operational amplifiers OP27GSZ and CA3130 and peripheral capacitors and resistors. The current signal output by the photoelectric sensor 13 is converted into a voltage signal by the first operational amplifier OP27GSZ after being DC-blocked and filtered by the capacitor. The voltage signal is amplified by the second operational amplifier OP27GSZ, and then the positive and negative voltage signals are adjusted to positive voltage signals by the third operational amplifier CA3130. The positive voltage signal is selected to enter the single-chip microcomputer system after passing through a resistor voltage divider and a low-pass filter circuit composed of capacitors and resistors. The single-chip microcomputer in this embodiment includes a control program for digital quantity input and output inside the single-chip microcomputer and a data acquisition and processing program. The digital quantity input control program inside the single-chip microcomputer reads the signal trigger circuit state, the data acquisition and processing program inside the single-chip microcomputer receives data through the analog quantity reading interface of the single-chip microcomputer, and the digital quantity output control program inside the single-chip microcomputer controls the output signal of the output control circuit.

[0029] The single-chip microcomputer minimum system circuit described in this embodiment is the data processing center of the signal function board 9. The optical signal received by the photoelectric sensor 13 enters the input port of the single-chip microcomputer minimum system circuit after being processed by the signal processing circuit. The real-time operating system inside the single-chip microcomputer minimum system circuit collects, processes and judges the current signal, and makes corresponding current signal output control based on the judgment result.

[0030] The signal trigger circuit described in this embodiment is composed of a comparator LM2903 and peripheral capacitors and resistors. The positive input of the comparator LM2903 is the current signal processed by the signal processing circuit, and the negative input of the comparator LM2903 is the trigger threshold set by the single-chip microcomputer minimum system circuit. When the current signal value processed by the signal processing circuit is higher than the trigger threshold, the comparator outputs a high-level voltage to the single-chip microcomputer minimum system circuit interface; when the current signal value processed by the signal processing circuit is lower than the trigger threshold, the comparator outputs a low-level voltage to the single-chip microcomputer minimum system circuit interface.

[0031] In this embodiment, the power function board 14 includes: Figure 4 (a) The power filter protection circuit shown in Figure 4 (b) The step-down circuit and isolation circuit shown; the multi-mode full-view spark detector is connected to the external input voltage DC24V through the connecting plug 12 and converted into a voltage that all chips in the power function board 14 can operate, wherein the external input voltage enters the power function board 14 through the electrical interface, and is coupled, filtered and protected by inductors and capacitors. The TPS54232 power management chip steps down the DC24V to DC12V, providing a 12V / 2A power supply for the signal function board 9 and multiple photoelectric sensors 13; including a power supply filtering protection circuit, a step-down circuit and an isolation circuit; the multi-mode full-view spark detector is connected to the DC24V power supply through the electrical interface, and enters the multi-mode full-view spark detector power supply device through current processing circuits such as filtering, shaping and protection, and the voltage is reduced to 12V, ±8V and 3.3V power by the step-down circuit to power different circuits in the multi-mode full-view spark detector. The specific circuit diagram is as follows Figure 4 (a) shows that the DC12V power supply passes through the B1212XT power isolation circuit and the MC78L08 step-down chip to provide ±8V power supply for the chip in the signal processing power supply of the signal function board 9, and also provides 3.3V power supply for the single-chip system through the LM117-3.3 chip. The specific circuit diagram is shown in Figure 4 (b) as shown.

[0032] Through experimental analysis, it can be known that a multi-mode full-view spark detector device based on a photoelectric sensor provided in this embodiment can realize the full-view spark detection function in the cross-sectional direction of the pipeline 15. The device is powered by an external DC24V. The power supply is provided through the electrical interface on the end cover 1 and the power function board 14 to provide a stable power supply for each component in the device. When a spark appears in the detection area of ​​the device, the photoelectric sensor in the glass window receives the spark light signal and generates a photoelectric signal change. The current signal passes through the signal processing circuit in the signal function board 9, amplifies, filters and shapes the current signal to obtain a voltage signal, and finally enters the data acquisition port of the single-chip microcomputer. The RT-Tread real-time operating system performs data analysis on the signal of the data acquisition port according to the judgment result of the signal trigger circuit. If the judgment result is a spark alarm information, the system will output a linkage signal or a communication signal; if the judgment result is not a spark alarm information, the system will clear the record and continue monitoring.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope defined by the claims of the present invention.

Claims

1. A multi-mode full-view spark detector based on a photoelectric sensor, characterized in that: The invention comprises a detector housing (3) provided with an end cover (1) and a window, a plurality of photoelectric sensors, a signal function board (9), a power function board (14) and a single chip microcomputer; the end cover (1) is a tail end sealing cover of a multi-mode full-view spark detector; the power function board (14) is arranged on the inner side of the end cover (1) of the detector housing (3); the signal function board (9) and the plurality of photoelectric sensors are arranged in the detector housing (3); the plurality of photoelectric sensors are vertically welded on the signal function board with a bevel angle of 30°; the photoelectric sensor is an optical signal acquisition device; after passing through the photoelectric sensor, the spark is converted into a current signal and enters the signal function board, and then the single chip microcomputer welded on the signal function board performs data acquisition and processing; the power function board (14) supplies power to the signal function board and the plurality of photoelectric sensors through an external power supply.

2. The multi-mode full-viewing angle spark detector based on a photoelectric sensor according to claim 1, characterized in that: The multi-mode full-view spark detector further comprises a sealing gasket (2), a shielding cover (4), a spherical glass (5), a clamping ring, a front sealing gasket (7), a board fixing screw (10), and a connecting plug (12); the sealing gasket (2) is placed between the end cover (1) and the detector housing (3), and is locked by a hexagon socket screw (11); the shielding cover (4) is a fixing device for the signal function board (9), and is fixed to the detector housing (3) by the shielding cover fastening screw (8); the spherical glass (5) is a window of the detector housing (3), that is, an information receiving entrance of the photoelectric sensor, and is connected to the detector housing (3) by a clamping ring (6); the clamping ring (6) is used to fix the spherical glass (5), and the inner side is a curved surface. The front end of the spark detector is fixedly fitted with the glass spherical surface, and the outer side is connected to the detector housing (3) by gluing; the front end sealing gasket (7) is fitted on the front end of the clamping ring (6) and is used to seal with the wall of the pipeline (15) to prevent dust leakage when the spark detector is installed in the pipeline (15) environment; the shield cover fastening screw (8) and the hexagon socket screw (11) are both fastening components; the signal function board and the power function board (14) are locked and fixed by the board fixing screws (10); the connecting plug (12) is used for the external electrical interface of the multi-mode full-view spark detector, and the connecting plug (12) is connected to the power function board (14) through the wiring terminal, and the external power supply enters the power function board (14) through the connecting plug (12).

3. The multi-mode full-viewing angle spark detector based on a photoelectric sensor according to claim 1, characterized in that: The multiple photoelectric sensors are arranged crosswise to detect sparks in a multi-mode and full-angle manner, wherein the effective detection area of ​​a single photoelectric sensor (13) is a 120° cone, and the multiple photoelectric sensors are arranged symmetrically so that their detection areas are interwoven to form a detection network, covering the entire cross-sectional direction in the pipeline (15), that is, achieving a lateral detection angle of 180°. When a spark appears, the photoelectric sensor (13) can convert the optical signal into a current signal, and the signal function board (9) amplifies, filters and shapes the current signal, and finally enters the single-chip microcomputer for data processing.

4. The multi-mode full-viewing angle spark detector based on a photoelectric sensor according to claim 1, characterized in that: The signal function board (9) comprises a signal processing circuit, a single-chip computer minimum system circuit, a signal trigger circuit and an output control circuit; the signal processing circuit performs response signal processing on the current signal output by the photoelectric sensor (13), that is, the voltage signal obtained after amplification, filtering and shaping by the signal processing circuit enters the single-chip computer analog quantity reading interface welded on the signal function board (9), and the signal trigger circuit and the single-chip computer perform joint judgment to make corresponding signal output control; the signal trigger circuit inputs a low level voltage or a high level voltage to the single-chip computer minimum system circuit interface according to the voltage signal value processed by the signal processing circuit The system in the single-chip microcomputer will select whether to parse the voltage signal data by judging the high and low level voltages received at the single-chip microcomputer minimum system circuit interface; the output control circuit is a circuit for the external output signal of the spark detector, which is controlled by the single-chip microcomputer minimum system circuit, and is in a spark-free state by default, the single-chip microcomputer minimum system output interface outputs a low level, and the output control circuit outputs a high level voltage; when the single-chip microcomputer determines that the signal received by the photoelectric sensor (13) and processed by the signal processing circuit and entering the single-chip microcomputer input port is in a spark state, the single-chip microcomputer minimum system interface outputs a high level, and the output control circuit outputs a low level voltage.

5. The multi-mode full-viewing angle spark detector based on a photoelectric sensor according to claim 4, characterized in that: The single-chip microcomputer minimum system circuit is the data processing center of the signal function board (9). The light signal received by the photoelectric sensor (13) enters the input port of the single-chip microcomputer minimum system circuit after being processed by the signal processing circuit. The real-time operating system inside the single-chip microcomputer minimum system circuit collects, processes and judges the current signal, and makes corresponding current signal output control according to the judgment result.

6. The multi-mode full-viewing angle spark detector based on photoelectric sensor according to claim 4, characterized in that: The signal trigger circuit is composed of a comparator and peripheral capacitors and resistors. The positive input of the comparator is a voltage signal processed by the signal processing circuit, and the negative input of the comparator is a trigger threshold set by the single-chip microcomputer minimum system circuit. When the voltage signal value processed by the signal processing circuit is higher than the trigger threshold, the comparator outputs a high-level voltage to the single-chip microcomputer minimum system circuit interface; when the voltage signal value processed by the signal processing circuit is lower than the trigger threshold, the comparator outputs a low-level voltage to the single-chip microcomputer minimum system circuit interface.

7. The multi-mode full-viewing angle spark detector based on a photoelectric sensor according to claim 4, characterized in that: The signal processing circuit is composed of three operational amplifiers and peripheral capacitors and resistors. The current signal output by the photoelectric sensor (13) is converted into a voltage signal by the first operational amplifier after being DC-blocked and filtered by the capacitor. The voltage signal is amplified by the second operational amplifier. The positive and negative voltage signals are adjusted into positive voltage signals by the third operational amplifier. The positive voltage signal is passed through a resistor voltage divider and a low-pass filter circuit composed of capacitors and resistors, and a voltage signal that does not exceed the power supply voltage of the single-chip computer is selected to enter the analog quantity reading interface of the single-chip computer.

8. The multi-mode full-viewing angle spark detector based on photoelectric sensor according to claim 1, characterized in that: The power function board (14) comprises a power filter protection circuit, a voltage reduction circuit and an isolation circuit; an external input voltage is input through a connecting plug (12) and converted into a voltage that can operate all chips in the power function board (14), wherein the external input voltage enters the power function board (14) through an electrical interface, is coupled, filtered and protected through inductance and capacitance, and is reduced by a power management chip to provide power for the signal function board (9) and a plurality of photoelectric sensors (13).

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