Light curtain fault detection method and system

Abstract

The invention provides a light curtain fault detection method and system, and relates to the technical field of light curtain fault detection, and the method comprises the steps: detecting the first signal intensity of a light beam emitted by an emitter end of a light curtain in real time, and the second signal intensity of the light beam received by a receiver end; if it is detected that the second signal intensity is smaller than or equal to the first signal intensity, and the difference between the second signal intensity and the first signal intensity exceeds a first preset threshold value, the calibration tool is controlled to conduct offset detection on the light curtain, and offset is obtained; if it is detected that the offset exceeds a second preset threshold value, light curtain fault early warning is carried out; and if it is detected that the second signal intensity is greater than the first signal intensity and the difference between the two is greater than or equal to the first signal intensity, performing light curtain fault early warning. By implementing the method, fault detection can be carried out in real time in the working process of the light curtain, the fault detection efficiency is improved, and potential safety hazards are reduced.

Description

Technical Field

[0001] The present application relates to the technical field of light curtain fault detection, and in particular to a light curtain fault detection method and system. Background Art

[0002] A light curtain is a safety device that is often used in industrial environments to protect people from mechanical equipment. It consists of a series of closely spaced light beams that form an invisible barrier. When any object - especially human body parts - passes through these beams, the machine will automatically stop running, thus preventing possible accidents or injuries.

[0003] During long-term use, the light curtain may have faults such as damage to the light-emitting or light-receiving elements, resulting in failure of safety protection. In the related art, the light-emitting and light-receiving states of the light curtain are usually checked manually and periodically, or special testing equipment is used to detect the light curtain point by point.

[0004] However, the fault detection method in the related art is not only cumbersome to operate, but also difficult to achieve real-time detection of the light curtain status, making it difficult for related technicians to discover and handle faults in a timely manner. Summary of the invention

[0005] The present application provides a light curtain fault detection method and system for detecting the state of the light curtain in real time without affecting the normal operation of the light curtain.

[0006] In a first aspect, the present application provides a light curtain fault detection method, which is applied to a light curtain fault detection system, and the method comprises: Real-time detection of a first signal strength of a light beam emitted by a transmitter end of the light curtain and a second signal strength of the light beam received by a receiver end; Determining whether the second signal strength is less than or equal to the first signal strength; If it is detected that the second signal strength is less than or equal to the first signal strength, and the difference between the two exceeds a first preset threshold, the calibration tool is controlled to perform an offset detection on the light curtain to obtain an offset; If it is detected that the offset exceeds the second preset threshold, a light curtain fault warning is issued; If it is detected that the second signal strength is greater than the first signal strength, determining whether the difference is greater than or equal to the first signal strength; If it is detected that the difference is greater than or equal to the first signal strength, a light curtain fault warning is issued.

[0007] Through the above embodiment, the light curtain fault detection system detects the first signal strength of the light beam emitted by the transmitter end and the second signal strength of the light beam received by the receiver end in real time, and further detects the light curtain offset or the difference between the first and second signal strengths according to the magnitude relationship between the two to determine whether the light curtain has a fault. Real-time fault detection is achieved during the operation of the light curtain, which improves fault detection efficiency and reduces safety hazards.

[0008] In some embodiments, after the step of determining whether the second signal strength is less than or equal to the first signal strength, the method further includes: If it is detected that the second signal strength is less than or equal to the first signal strength, and the difference between the two does not exceed the first preset threshold, the concentration of suspended particulate matter in the air is obtained through the sensor; If it is detected that the concentration of the suspended particulate matter exceeds the preset concentration threshold, a light curtain fault warning will be issued.

[0009] Through the above embodiments, the light curtain fault detection system incorporates the concentration of suspended particulate matter in the light curtain working environment into the monitoring index, which can eliminate the interference of environmental factors, improve the accuracy of fault judgment, and avoid underreporting.

[0010] In some embodiments, after the step of obtaining the concentration of suspended particulate matter in the air through a sensor if it is detected that the second signal strength is less than or equal to the first signal strength and the difference between the two exceeds a first preset threshold, the method further includes: Constructing a curve of the concentration of the suspended particulate matter over time, and determining the change trend of the concentration of the suspended particulate matter, the change trend including an increasing trend, a decreasing trend and a fluctuating trend; If it is detected that the change trend is an increasing trend within the preset time period, a light curtain fault warning is issued.

[0011] Through the above embodiments, the light curtain fault detection system can predict the fault risk and issue an early warning before the fault occurs by analyzing the dynamic change curve of the concentration.

[0012] In some embodiments, after the step of detecting the first signal strength of the light beam emitted by the transmitter end of the light curtain in real time and the second signal strength of the light beam received by the receiver end, the method further includes: The control circuit sequentially turns off the light beam emission sources of the transmitter end, the transmitter end includes a plurality of light beam emission sources, each emission source corresponds to a light beam receiving device of the receiver end; If one or more light beam emitting sources are turned off and the corresponding light beam receiving device still receives the light beam, a fault warning is issued for the one or more light beam emitting sources.

[0013] Through the above embodiments, the light curtain fault detection system controls the transmitting end to turn off the light beam in sequence, determines whether the receiving end can still receive the signal, and detects whether there is an uncontrolled abnormal emission source in the transmitter, so as to facilitate the subsequent positioning and processing of the light curtain fault.

[0014] In some embodiments, after the step of determining whether the difference is greater than or equal to the first signal strength if the second signal strength is detected to be greater than the first signal strength, the method further includes: If it is detected that the difference is smaller than the first signal strength, a light source interference warning is issued.

[0015] Through the above embodiments, the light curtain fault detection system defines the situation where the second signal strength is greater than the first signal strength but the difference is not large as light source interference rather than a serious fault. It can distinguish signal strength abnormalities caused by different reasons, facilitate subsequent targeted early warning or maintenance measures, and improve the precision of fault diagnosis.

[0016] In some embodiments, after the step of performing a light curtain fault warning if it is detected that the difference is greater than or equal to the first signal strength, the method further includes: Determine the cause of the fault based on the triggering conditions of the light curtain fault warning; The cause of the fault is displayed on the terminal display.

[0017] Through the above-mentioned embodiments, the light curtain fault detection system can guide the operator to quickly identify the problem and shorten the troubleshooting time by displaying the cause of the fault on the terminal screen.

[0018] In some embodiments, the light curtain fault warning includes sound and light warning and information warning.

[0019] Through the above embodiments, the light curtain fault detection system can select appropriate early warning means according to environmental conditions and the severity of the fault, thereby improving the humanization level of early warning.

[0020] In a second aspect, the present application provides a light curtain fault detection system, the light curtain fault detection system comprising: one or more processors and a memory; The memory is coupled to the one or more processors, and the memory is used to store computer program code, which includes computer instructions. The one or more processors call the computer instructions so that the light curtain fault detection system can implement a light curtain fault detection method provided in the above embodiment, which will not be repeated here.

[0021] In a third aspect, the present application provides a computer-readable storage medium, including instructions. When the instructions are executed on a light curtain fault detection system, the light curtain fault detection system can implement a light curtain fault detection method provided in the above embodiment, which will not be repeated here.

[0022] In a fourth aspect, the present application provides a computer program product. When the computer program product runs on a light curtain fault detection system, the light curtain fault detection system can implement a light curtain fault detection method provided in the above embodiment, which will not be repeated here.

[0023] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages: 1. The light curtain fault detection system can comprehensively and dynamically evaluate the working status of the light curtain by real-time detection of multiple parameters such as the signal strength and its difference at the transmitter and receiver ends, the light curtain offset, and comprehensive analysis of the changes in these parameters. Including multiple factors that may affect the performance of the light curtain in the monitoring scope not only avoids the one-sidedness of single indicator judgment, but also overcomes the lag of regular manual inspection. This real-time dynamic multi-parameter comprehensive detection method improves the timeliness and accuracy of fault detection, can detect problems as soon as they occur, and reduce safety hazards.

[0024] 2. The light curtain fault detection system uses the concentration of suspended particulate matter in the environment as an important monitoring indicator, and predicts the risk of faults by analyzing the dynamic change curve of its concentration. The system can automatically distinguish whether the abnormality of the light curtain performance is caused by a fault or environmental interference, avoiding false alarms or missed alarms. In addition, the system can also judge whether it is a serious fault or a slight light source interference based on the size of the signal strength difference, further improving the precision of fault diagnosis, making the light curtain fault detection system have good environmental adaptability.

[0025] 3. The light curtain fault detection system selects appropriate methods such as sound and light warning and information warning according to environmental conditions and the severity of the fault, which improves the humanization level of the warning. Once a fault is confirmed, the system will also intuitively display the cause of the fault on the terminal screen to guide the operator to quickly locate the problem. The response processing time of the fault is shortened and the burden of manual diagnosis is reduced. In addition, the system can also detect abnormal emission sources by controlling the transmitting end to turn off the light beam in sequence, further assisting in fault location. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a flow chart of a light curtain fault detection method in an embodiment of the present application; Figure 2 is another flow chart of a light curtain fault detection method in an embodiment of the present application; Figure 3 It is a schematic diagram of the structure of a physical device of the light curtain fault detection system in the embodiment of the present application. DETAILED DESCRIPTION

[0027] The terms used in the following embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to be used as limitations to the present application. As used in the specification and appended claims of the present application, the singular expressions "one", "a kind of", "said", "above", "the" and "this" are intended to also include plural expressions, unless there is a clear indication to the contrary in the context. It should also be understood that the term "and / or" used in the present application refers to any or all possible combinations comprising one or more listed items.

[0028] In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as suggesting or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features, and in the description of the embodiments of the present application, unless otherwise specified, "plurality" means two or more.

[0029] A light curtain is a safety device that is often used in industrial environments to protect people from mechanical equipment. It consists of a series of closely spaced light beams that form an invisible barrier. When any object—especially human body parts—passes through these light beams, the machine will automatically stop running, thereby preventing possible accidents or injuries. During long-term use, light curtains may experience failures such as damage to the light-emitting or light-receiving elements, resulting in failure of safety protection. In related technologies, the light-emitting and light-receiving states of light curtains are usually checked manually and regularly, or special test equipment is used to perform point-by-point inspections of light curtains.

[0030] However, the fault detection method in the related art is not only cumbersome to operate, but also difficult to achieve real-time detection of the light curtain status, making it difficult for related technicians to discover and handle faults in a timely manner.

[0031] In this regard, the present application provides a light curtain fault detection method and system, which detects the first signal strength of the light beam emitted by the transmitter end and the second signal strength of the light beam received by the receiver end in real time, and further detects the light curtain offset or the difference between the first and second signal strengths according to the magnitude relationship between the two to determine whether the light curtain has a fault. This achieves real-time detection of the light curtain status without affecting the normal operation of the light curtain.

[0032] For ease of understanding, the following is a flow chart of the method provided in this implementation. Figure 1 The figure is a flow chart of a light curtain fault detection method in an embodiment of the present application.

[0033] S101, detecting in real time a first signal strength of a light beam emitted by a transmitter end of a light curtain and a second signal strength of a light beam received by a receiver end.

[0034] Specifically, technicians can install high-precision photoelectric sensors on the transmitter and receiver of the light curtain to collect light intensity data in real time. The light curtain fault detection system continuously monitors the light signal intensity at the transmitter and receiver of the light curtain through sensors, namely the first signal intensity and the second signal intensity. Among them, the light intensity at the transmitter is used as a reference value, and the light intensity at the receiver reflects the actual working status of the light curtain. By comparing the difference between the two signal intensities, the system can preliminarily determine whether the light curtain is abnormal.

[0035] For example, in a specific embodiment, the transmitter end of the light curtain fault detection system has 100 infrared light emitting diodes, and the receiving end has 100 corresponding phototransistors. The light curtain fault detection system reads the light intensity values ​​of all transmitters and receivers every 0.01 seconds, and records them as two 100-dimensional data vectors. Under normal circumstances, each component of the transmitted light intensity vector should be much greater than the ambient light intensity, and each component of the received light intensity vector should also maintain a high consistency with the transmitting end. If it is found that the light intensity difference between the two ends is too large, or some abnormal component values ​​appear, it means that the light curtain may have a fault.

[0036] S102: The second signal strength is less than or equal to the first signal strength.

[0037] It is understandable that, ideally, since light will have a certain amount of energy loss during propagation, the second signal strength detected by the receiving end should be slightly lower than the first signal strength detected by the transmitting end. If the second signal strength detected at the receiving end is greater than or much greater than the first signal strength at the transmitting end, it indicates that the receiving end is interfered by an external light source, and further light curtain fault judgment is required, such as step S103. On the contrary, if the second signal strength at the receiving end is significantly lower than the first signal strength at the transmitting end, it may be caused by an obstruction of the optical path or a decrease in the sensitivity of the receiver, and further fault judgment is also required, such as step S107. Through this step of judgment, the light curtain fault detection system can further narrow the scope of the cause of the fault.

[0038] Specifically, after the light curtain fault detection system obtains the first signal strength and the second signal strength in step S101, the two are compared. If it is detected that the second signal strength is less than or equal to the first signal strength, step S103 is executed. Otherwise, if it is detected that the second signal strength is greater than the first signal strength, step S107 is entered.

[0039] S103: The difference exceeds a first preset threshold.

[0040] When the second signal strength at the receiving end is lower than the first signal strength at the transmitting end, and the difference between the two exceeds the preset threshold, the light curtain fault detection system determines that the light curtain has a serious abnormality and needs to further confirm the fault point. Among them, the first preset threshold represents the upper limit of the light intensity loss that can be tolerated during the propagation of the light beam from the transmitter end to the receiver end. Exceeding this upper limit means that the light path may be blocked or the receiver sensitivity is significantly reduced.

[0041] Specifically, after detecting that the second signal strength is less than or equal to the first signal strength, the light curtain fault detection system calculates the difference between the second signal strength and the first signal strength. If it is detected that the difference exceeds the first preset threshold, step S104 is executed to perform light curtain offset detection to determine whether the abnormal phenomenon is caused by the light curtain offset. Otherwise, if it is detected that the difference does not exceed the first preset threshold, it means that the difference between the second signal strength and the first signal strength is within a reasonable range, and step S108 is executed without fault warning.

[0042] It should be noted that the first preset threshold can be adjusted by relevant technical personnel according to actual needs and is not limited here.

[0043] S104, controlling the calibration tool to perform offset detection on the light curtain to obtain an offset amount.

[0044] After confirming that the light intensity at the receiving end is seriously low (i.e. the difference exceeds the first preset threshold), the light curtain fault detection system starts the calibration tool through instructions to measure the actual offset of the light curtain. The offset reflects the difference between the current position of the light curtain and the standard installation position. If the offset is detected to be beyond a certain range, the system determines that a light curtain fault has occurred, otherwise it is determined to be a temporary light path obstruction.

[0045] It should be noted that the calibration tool usually uses a high-precision displacement sensor, such as a laser rangefinder, a capacitive displacement meter, etc. Among them, the sensor and the light curtain maintain a relatively fixed position relationship to ensure the consistency of the measurement. During the specific measurement, the sensor collects the spatial coordinate data of the light curtain surface from multiple angles, and then compares it with the initial calibration data to calculate the offset of the light curtain in each direction.

[0046] For example, in a specific embodiment, the light curtain fault detection system detects a serious attenuation of light intensity at a location, and then starts the laser rangefinder to detect the position of the light curtain at that location. The rangefinder collects data from the front, side, and upper directions, and repeats each direction three times. Finally, it is concluded that the light curtain is offset by 3mm in the vertical direction and 5mm in the horizontal direction.

[0047] S105: The offset exceeds a second preset threshold.

[0048] The light curtain fault detection system compares the offset measured in step S104 with the second preset threshold value to determine whether the offset of the light curtain exceeds the allowable range. If the offset exceeds the second preset threshold value, it is determined that the offset of the light curtain exceeds the allowable range, and step S106 is executed to issue a light curtain fault warning to relevant technical personnel. On the contrary, if the offset does not exceed the second preset threshold value, step S108 is executed, that is, no warning operation is performed.

[0049] It should be noted that, similar to the first threshold, the second threshold represents the maximum tolerance limit of the light curtain position deviation from the standard value. The size of the threshold mainly depends on the size and resolution of the light curtain and the safety level of the device where it is located. The specific value can be set by relevant technicians on the light curtain fault detection system and is not limited here.

[0050] S106. Perform a light curtain fault warning.

[0051] When the excess value of the second signal strength and the first signal strength is greater than or equal to the first signal strength, the light curtain fault detection system will send a fault warning signal to the host computer or operator. In addition, when the offset exceeds the second threshold, or other serious abnormalities occur, the light curtain fault detection system will also send a fault warning signal to the host computer or operator, so that the operator can find the fault of the light curtain in time and reduce safety hazards.

[0052] It should be noted that the warning signal can be in various forms, such as sound and light alarms, text messages, voice broadcasts, etc., and should be flexibly selected according to the on-site environment and personnel configuration. At the same time, the warning information should also include preliminary fault judgment results, such as fault type and fault location, to guide subsequent maintenance work, which is not limited here.

[0053] In addition, to improve the reliability of early warning, the system can also take a series of linkage measures while issuing an alarm, such as automatically cutting off the power supply of the equipment controlled by the light curtain to prevent it from continuing to operate, or calling the surveillance camera to record the fault scene for evidence, etc., which are not limited here.

[0054] S107: Whether the difference is greater than or equal to the first signal strength.

[0055] After comparing the light intensity at the transmitting end and the receiving end, if the light curtain fault detection system does not detect serious light intensity attenuation, it will further determine whether the light intensity at the receiving end is significantly higher than that at the transmitting end. This situation is usually because the light curtain is seriously interfered by external light sources, the signal is distorted, and may cause false triggering or failure. The stronger the interfering light intensity, the higher the potential risk. Therefore, the system compares the difference in light intensity of the receiving end exceeding that of the transmitting end with the light intensity of the transmitting end itself, and evaluates the severity of the interference accordingly. Further, if the difference is greater than or equal to the first signal strength, step S106 is executed to issue a light curtain fault warning. Conversely, if the difference is less than the first signal strength, S108 is executed and no light curtain fault warning is issued.

[0056] S108: No light curtain fault warning is performed.

[0057] If the system does not detect severe light intensity attenuation or excessive external interference in the above steps, it is considered that the light curtain is operating normally and there is no need to issue a fault warning signal, and the light curtain status continues to be monitored.

[0058] In the above embodiment, the light curtain fault detection system detects the first signal strength of the light beam emitted by the transmitter end and the second signal strength of the light beam received by the receiver end in real time, and further detects the light curtain offset or the difference between the first and second signal strengths based on the magnitude relationship between the two to determine whether the light curtain has a fault. Real-time fault detection is achieved during the operation of the light curtain, which improves fault detection efficiency and reduces safety hazards.

[0059] The following is a more detailed description of the process of the method provided by this embodiment. Figure 2 As shown, it is another flow chart of a light curtain fault detection method according to an embodiment of the present application.

[0060] S201, detecting in real time a first signal strength of a light beam emitted by a transmitter end of the light curtain and a second signal strength of a light beam received by a receiver end.

[0061] This step is the same as step S101 and will not be repeated here.

[0062] S202, the control circuit turns off the light beam emission sources at the transmitter end in sequence.

[0063] After determining that the signal strength is abnormal, the light curtain fault detection system will automatically perform a series of diagnostic procedures, including checking the transmitters one by one. Specifically, the system control circuit cuts off the power supply to each transmitter in turn, turns off its light-emitting function, and monitors the signal changes of the corresponding receiver.

[0064] For example, in a specific embodiment, if the system detects that the signal strength of the receiving end has dropped significantly for several consecutive days, the system will cut off the power supply circuit of each transmitter in the order of numbers from 1 to 60. Once the signal strength of a certain receiver is found to be normal after cutting off, it means that the transmitter with the corresponding number may be faulty. At this time, the system will send an alarm message to the host computer or the on-site operation panel, prompting the maintenance personnel to focus on checking the transmitter and its power supply circuit and eliminate the hidden danger in time.

[0065] S203: If one or more light beam emitting sources are turned off and the corresponding light beam receiving device still receives the light beam, a fault warning is issued for the one or more light beam emitting sources.

[0066] The transmitter and receiver of the light curtain should correspond one to one. In theory, when a transmitter stops supplying power, the paired receiver should immediately detect no light signal. However, if the system detects that the corresponding receiver can still receive the light beam after the transmitter power is cut off, it means that the light curtain may be interfered by an external light source, or the transmitter itself has leakage, backflow and other faults. Therefore, the system turns off the light beam emission source at the transmitter end in turn, and detects whether the corresponding receiver signal changes. If so, the light beam emission source continues to be turned on, and the next light beam emission source is turned off at the same time, and the next light beam emission source is detected for fault. After all the tests are completed, if one or more light beam emission sources are turned off, and the corresponding light beam receiving device still receives the light beam, a fault warning is issued for one or more light beam emission sources.

[0067] In the above embodiment, the light curtain fault detection system controls the transmitting end to turn off the light beam in sequence, determines whether the receiving end can still receive the signal, and detects whether there is an uncontrolled abnormal emission source in the transmitter, so as to facilitate the subsequent positioning and processing of the light curtain fault.

[0068] S204: If it is detected that the second signal strength is less than or equal to the first signal strength, and the difference between the two does not exceed the first preset threshold, the concentration of suspended particulate matter in the air is obtained through the sensor.

[0069] In addition to the failure of the transmitter and receiver themselves, environmental factors may also cause abnormal signal strength of the light curtain. Among them, suspended particles such as dust and fog in the air are the most common interference sources. When these particles gather in large quantities in the detection area of ​​the light curtain, they will absorb and scatter part of the light beam, causing the signal strength at the receiving end to decrease.

[0070] In response to this, relevant technicians now install air quality sensors on the light curtain to read the current suspended particle concentration data. When it is detected that the second signal strength at the receiving end is less than or equal to the first signal strength at the transmitting end, but the difference between the two does not exceed the threshold, the system controls the air quality sensor through instructions to read the current suspended particle concentration data.

[0071] S205: If it is detected that the concentration of suspended particulate matter exceeds a preset concentration threshold, a light curtain fault warning is issued.

[0072] Excessive dust, oil mist and other particles will accelerate the aging of optical components and shorten their service life. At the same time, they may cause crosstalk, reflection and other problems, disrupting the detection and judgment of the light curtain.

[0073] Therefore, the light curtain fault detection system has introduced a concentration warning mechanism based on environmental monitoring. The system will set a safety threshold for suspended particulate matter concentration according to the air quality requirements of the place where the light curtain is located. Once the actual concentration is detected to exceed the threshold, the system will issue a warning signal regardless of whether the light intensity fluctuation has reached the standard of equipment failure at that time.

[0074] In the above embodiment, the light curtain fault detection system incorporates the concentration of suspended particulate matter in the light curtain working environment into the monitoring index, which can eliminate the interference of environmental factors, improve the accuracy of fault judgment, and avoid underreporting.

[0075] S206. Construct a curve of the change of suspended particulate matter concentration over time to determine the change trend of the suspended particulate matter concentration.

[0076] After the light curtain fault detection system obtains the concentration of suspended particulate matter in the working environment, it constructs a change curve with time as the horizontal axis and concentration as the vertical axis. By analyzing the morphological characteristics of the curve, the dynamic trend of the particle concentration is determined. Specifically, the system can select a certain time window (such as 1 hour) and calculate the concentration difference between every two adjacent sampling points in the window. If these differences are all positive numbers and the average value exceeds a preset "significant growth" threshold (such as 10μg / m³), it can be preliminarily determined to be a continuous increase trend.

[0077] The system can use the current time as the starting point and calculate the mean (center line) and standard deviation of the concentration value based on the historical data within the preset time period in the past. Then, based on the center line, set the upper control limit (UCL) and lower control limit (LCL) above and below it, generally at ±3 times the standard deviation of the center line. Next, the system performs real-time detection on the newly collected concentration value to determine whether it falls within the range of UCL and LCL. If the continuous data points are within the range and there is no out-of-control mode such as unilateral continuous 7-point rise / fall, it can be determined to be in a stable controlled state, that is, in a fluctuating trend. At the same time, the system can also regularly update the center line and control limit of the control curve. Generally, the sliding average method can be used, that is, as time goes by, the earliest n data are gradually eliminated, the latest n data are added, and the relevant parameters are recalculated to ensure the dynamic and adaptive nature of the judgment criteria and processes.

[0078] In addition, the system first divides the curve into several time periods (such as daily and weekly). Then, a first-order linear fit is performed on the data points in each time period to calculate the slope and intercept of the segment. If the slope of a time period is negative and the absolute value exceeds a preset "significant decrease" threshold (such as -5μg / m³ / day), it will be marked as a downward step. If multiple consecutive time periods (such as 3) are marked as downward steps, and the average concentration value of each step decreases in a step-like manner, it can be determined as a decreasing trend.

[0079] S207: If it is detected that the change trend within the preset time period is an increasing trend, a light curtain fault warning is issued.

[0080] Specifically, after the system detects that the change trend of the suspended particle concentration within a preset time period is an increasing trend, the system issues a light curtain fault warning indicating that the suspended particle concentration is too high.

[0081] In the above embodiment, the light curtain fault detection system can predict the fault risk and issue an early warning before the fault occurs by analyzing the dynamic change curve of the concentration.

[0082] The light curtain fault detection system of the embodiment of the present invention is applied to electronic equipment. Figure 3 A schematic diagram of the architecture of an electronic device suitable for implementing an embodiment of the present invention is shown.

[0083] It should be noted that Figure 3 The electronic device shown is only an example and should not bring any limitation to the functions and scope of use of the embodiments of the present invention.

[0084] Those skilled in the art will appreciate that all or part of the steps in the various methods of the above embodiments can be completed by instructions (computer programs), or by controlling related hardware through instructions (computer programs), and the instructions can be stored in a computer-readable storage medium and loaded and executed by a processor. The electronic device of this embodiment includes a storage medium and a processor, wherein a plurality of instructions are stored in the storage medium, and the instructions can be loaded by the processor to execute any step of the method provided in the embodiment of the present invention.

[0085] Specifically, the storage medium and the processor are electrically connected directly or indirectly to realize data transmission or interaction. For example, these elements can be electrically connected to each other through one or more signal lines. The storage medium stores computer execution instructions for implementing the data access control method, including at least one software function module that can be stored in the storage medium in the form of software or firmware. The processor executes various functional applications and data processing by running the software program and module stored in the storage medium. The storage medium can be, but is not limited to, random access storage medium (Random Access Memory, referred to as: RAM), read-only storage medium (Read Only Memory, referred to as: ROM), programmable read-only storage medium (Programmable Read-Only Memory, referred to as: PROM), erasable read-only storage medium (Erasable Programmable Read-Only Memory, referred to as: EPROM), electrically erasable read-only storage medium (Electric Erasable Programmable Read-Only Memory, referred to as: EEPROM), etc. Among them, the storage medium is used to store programs, and the processor executes the program after receiving the execution instruction.

[0086] Furthermore, the software programs and modules in the above-mentioned storage medium may also include an operating system, which may include various software components and / or drivers for managing system tasks (such as memory management, storage device control, power management, etc.), and may communicate with various hardware or software components to provide an operating environment for other software components. The processor may be an integrated circuit chip having signal processing capabilities. The above-mentioned processor may be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc., which may implement or execute the various methods, steps, and logic flow diagrams disclosed in this embodiment. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0087] Since the instructions stored in the storage medium can execute the steps in any method provided in the embodiments of the present invention, the beneficial effects of any method provided in the embodiments of the present invention can be achieved. Please refer to the previous embodiments for details and will not be repeated here.

[0088] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A light curtain fault detection method, applied to a light curtain fault detection system, characterized in that: The method comprises: Real-time detection of a first signal strength of a light beam emitted by a transmitter end of the light curtain and a second signal strength of the light beam received by a receiver end; Determining whether the second signal strength is less than or equal to the first signal strength; If it is detected that the second signal strength is less than or equal to the first signal strength, and the difference between the two exceeds a first preset threshold, the calibration tool is controlled to perform an offset detection on the light curtain to obtain an offset; If it is detected that the offset exceeds a second preset threshold, a light curtain fault warning is issued; If it is detected that the second signal strength is greater than the first signal strength, determining whether the difference is greater than or equal to the first signal strength; If it is detected that the difference is greater than or equal to the first signal strength, a light curtain fault warning is performed.

2. The method according to claim 1, characterized in that After the step of determining whether the second signal strength is less than or equal to the first signal strength, the method further includes: If it is detected that the second signal strength is less than or equal to the first signal strength, and the difference between the two does not exceed a first preset threshold, the concentration of suspended particulate matter in the air is obtained through the sensor; If it is detected that the concentration of the suspended particulate matter exceeds a preset concentration threshold, a light curtain fault warning is issued.

3. The method according to claim 2, characterized in that After the step of obtaining the concentration of suspended particulate matter in the air through a sensor if it is detected that the second signal strength is less than or equal to the first signal strength and the difference between the two exceeds a first preset threshold, the method further includes: Constructing a curve of the concentration of the suspended particulate matter over time, and determining a change trend of the concentration of the suspended particulate matter, wherein the change trend includes an increasing trend, a decreasing trend, and a fluctuating trend; If it is detected that the change trend is an increasing trend within the preset time period, a light curtain fault warning is issued.

4. The method according to claim 1, characterized in that: After the step of real-time detecting the first signal strength of the light beam emitted by the transmitter end of the light curtain and the second signal strength of the light beam received by the receiver end, the method further includes: The control circuit sequentially turns off the light beam emission sources of the transmitter end, wherein the transmitter end includes a plurality of light beam emission sources, each emission source corresponding to a light beam receiving device of the receiver end; If one or more light beam emitting sources are turned off, but the corresponding light beam receiving device still receives the light beam, a fault warning is issued for the one or more light beam emitting sources.

5. The method according to claim 1, characterized in that After the step of determining whether the difference is greater than or equal to the first signal strength if the second signal strength is detected to be greater than the first signal strength, the method further includes: If it is detected that the difference is smaller than the first signal strength, a light source interference warning is issued.

6. The method according to claim 1, characterized in that After the step of performing a light curtain fault warning if it is detected that the difference is greater than or equal to the first signal strength, the method further includes: Determine the cause of the fault based on the triggering conditions of the light curtain fault warning; The cause of the fault is displayed on the terminal display.

7. The method according to claim 1, characterized in that The light curtain fault warning includes sound and light warning and information warning.

8. A light curtain fault detection system, characterized in that: The light curtain fault detection system includes: one or more processors and memory; The memory is coupled to the one or more processors, and the memory is used to store computer program codes, wherein the computer program codes include computer instructions, and the one or more processors call the computer instructions to enable the light curtain fault detection system to perform the method according to any one of claims 1 to 7.

9. A computer-readable storage medium comprising instructions, characterized in that: When the instruction is executed on the light curtain fault detection system, the light curtain fault detection system is caused to execute the method according to any one of claims 1 to 7.

10. A computer program product, characterized in that When the computer program product runs on a light curtain fault detection system, the light curtain fault detection system is enabled to perform the method according to any one of claims 1 to 7.

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