Optical beam smoke detection apparatus and method of controlling the same

Abstract

The present application relates to the technical field of fire detection, in particular to a light beam smoke detection device and a control method thereof, which monitors the power supply current of a target device in real time through a current detection module, determines the running state according to the current signal by a control unit, and outputs a lock control signal when the running state continuously meets the preset condition, so that the linear light beam smoke detector is switched to the lock mode to suppress the alarm output, thus avoiding false alarms caused by physical obstruction of the light path during the movement of the bridge crane; when the target device stops running, the control unit outputs a reset control signal to make the detector instantly restore the fire detection mode, ensuring that the fire monitoring sensitivity is not affected. The above linkage mechanism takes the accurate identification of the device running state as the premise, realizes the consideration of false alarm prevention and fire detection function, and effectively improves the system reliability.

Description

Technical Field

[0001] This invention relates to the field of fire detection technology, and in particular to a beam smoke detection device and its control method. Background Technology

[0002] Linear beam smoke detectors are fire detection devices based on the principle of light attenuation. They utilize the absorption and scattering of infrared light beams by smoke particles. By placing a transmitter and a receiver (or reflector) at opposite ends of the detection area, the system monitors changes in light intensity at the receiver in real time to determine if a fire has occurred. When smoke is present in the detector's optical path, the smoke particles cause the infrared beam to attenuate. When the light intensity at the receiver drops below a preset threshold, the system triggers a fire alarm. This type of detector offers advantages such as a wide protection range and easy installation, making it particularly suitable for fire detection in large spaces.

[0003] Pumped-storage power plants typically employ linear beam smoke detectors with transmitters and receivers arranged along a span above the generator floor to form a linear detection optical path covering the entire area, serving as the primary means of smoke detection. However, the generator floor of a pumped-storage power plant is usually equipped with bridge cranes for generator installation, maintenance, and the lifting of large equipment. As large mobile equipment, these bridge cranes reciprocate along the longitudinal tracks of the power plant. During operation, the metal bridges, trolleys, and lifting devices periodically and physically obstruct the beam detection optical path. According to the working principle of linear beam smoke detectors, when the optical path is completely or partially blocked, the light intensity received by the receiver drops sharply. The system cannot distinguish whether the light intensity attenuation is caused by smoke or physical obstruction, thus misinterpreting it as smoke and triggering a fire alarm, disrupting the normal operation and maintenance of the power plant.

[0004] To address the aforementioned issues, there is an urgent need for a technical solution that can effectively identify the type of obstruction and adjust the detector's operating mode accordingly during the operation of a bridge crane, thereby eliminating false alarms caused by the crane's operation while ensuring that the fire detection sensitivity remains unaffected. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a beam smoke detection device and its control method.

[0006] In a first aspect, embodiments of the present invention provide a beam smoke detection device, comprising: The current detection module is used to detect the power supply current of the target device and output a current detection signal; The control unit, connected to the current detection module, is used to determine whether the target device is in a running state based on the current detection signal. When the target device is determined to be in a running state and the duration of the running state meets a preset condition, a lockout control signal is output. When the target device is determined to be in a stopped state, a reset control signal is output. A linear beam smoke detector, connected to the control unit, is used to switch to a locked mode in response to the lockout control signal and to switch to a fire detection mode in response to the reset control signal; the linear beam smoke detector suppresses alarm output in the locked mode.

[0007] In conjunction with the first aspect, the control unit includes: The comparison and judgment module is used to compare the current value corresponding to the current detection signal with a preset reference threshold, and determine whether the target device is in a running state or a stopped state based on the comparison result.

[0008] In conjunction with the first aspect, the control unit further includes: The delay determination module is used to determine whether the duration of the state reaches a preset time threshold when the current value is greater than or equal to the preset reference threshold. If it does, the target device is determined to be in operation.

[0009] In conjunction with the first aspect, the current detection module includes a non-contact Hall current sensor, which is installed in the power distribution box of the target device to sense and detect the current in the power supply line.

[0010] In conjunction with the first aspect, the Hall current sensor has an openable / closing structure and is snapped onto the outside of the live wire of the main power supply line of the power distribution box.

[0011] In conjunction with the first aspect, the control unit includes: The first microcontroller control unit is connected to the current detection module and is used to receive the current detection signal and perform analog-to-digital conversion processing. The second microcontroller control unit is communicatively connected to the first microcontroller control unit. It is used to receive the converted signal, determine the status, and output the lockout control signal or the reset control signal.

[0012] In conjunction with the first aspect, the first microcontroller control unit includes: an ADC digital-to-analog conversion interface and a filtering module; The analog signal of the current detection signal is converted into a digital signal by the ADC digital-to-analog converter interface, and the interference signal is filtered out by the filtering module.

[0013] In conjunction with the first aspect, the locking control signal is a low-level signal, the reset control signal is a high-level signal, and the linear beam smoke detector receives the low-level signal or the high-level signal through its control port.

[0014] Secondly, this application provides a control method for a beam smoke detection device, applied to the device described above; the method includes: Detect the power supply current of the target device and obtain the current detection signal; Based on the current detection signal, it is determined whether the target device is in operation. When it is determined that the target device is in operation, a lockout control signal is output to the linear beam smoke detector to control the linear beam smoke detector to switch to the lockout mode. In the lockout mode, the linear beam smoke detector suppresses the alarm output. When the target device is determined to be in a stopped state, a reset control signal is output to the linear beam smoke detector to control the linear beam smoke detector to switch to fire detection mode.

[0015] In conjunction with the second aspect, the target equipment is a bridge crane; The step of determining whether the target device is in operation based on the current detection signal includes: The current detection signal is converted into a current value; Determine whether the current value is greater than or equal to a preset reference threshold; If not, the target device is determined to be in a stopped state; If so, determine whether the duration for which the current value is greater than or equal to the preset reference threshold has reached a preset time threshold; If so, the target device is determined to be in operation. If not, the target device is determined to be not in operation.

[0016] Thirdly, this application provides an electronic device, which includes a memory and a processor. The memory stores a computer program, and the processor runs the computer program to cause the electronic device to perform the methods described above.

[0017] Fourthly, this application provides a readable storage medium storing computer program instructions, which, when read and executed by a processor, perform the above-described method.

[0018] The embodiments of this invention bring the following beneficial effects: This application provides a beam smoke detector and its control method. A current detection module monitors the power supply current of the target equipment in real time. The control unit determines the operating status based on the current signal and outputs a lockout control signal when the operating status continuously meets preset conditions. This switches the linear beam smoke detector to lockout mode to suppress alarm output, fundamentally preventing false alarms caused by physical obstruction of the light path during the movement of the target equipment (such as a bridge crane). When the target equipment stops running, the control unit outputs a reset control signal to immediately restore the detector to fire detection mode, ensuring that the fire monitoring sensitivity is not affected. The above-mentioned linkage mechanism, based on the accurate identification of the equipment's operating status, achieves a balance between false alarm prevention and fire detection functions, effectively improving system reliability.

[0019] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention are realized and obtained in accordance with the structures particularly pointed out in the description, claims and drawings.

[0020] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0021] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the architecture of the beam smoke detection device provided in Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the architecture of the beam smoke detection device provided in Embodiment 2 of the present invention; Figure 3 A flowchart of the control method for the beam smoke detection device provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the principle of the beam smoke detection device provided in the embodiment of the present invention; Figure 5 This is a schematic diagram of the electronic device structure provided in an embodiment of the present invention.

[0023] Figure label: 10-Current detection module, 20-Control unit, 21-Comparison and judgment module, 22-Delay judgment module, 23-First microcontroller control unit, 231-ADC digital-to-analog conversion interface, 232-Filtering module, 24-Second microcontroller control unit, 30-Beam smoke detector; 130 - Processor, 131 - Memory, 132 - Bus, 133 - Communication interface. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] After introducing the technical terms used in this application, the application scenarios and design concepts of the embodiments of this application will be briefly described below.

[0026] Linear beam smoke detectors are suitable for large, open spaces, and are commonly used as a fire detection method in the main power generation layer of pumped storage power plants. However, the operation of bridge cranes on the power generation layer can physically block the detection beam, causing frequent false alarms due to a sudden drop in light intensity, which disrupts the normal operation and maintenance of the power plant.

[0027] Based on this, this application provides a beam smoke detection device and its control method.

[0028] Example 1 This application provides a beam smoke detection device, such as... Figure 1 As shown, the device includes: a current detection module 10, a control unit 20, and a linear beam smoke detector 30.

[0029] The current detection module 10 is used to detect the power supply current of the target device and output a current detection signal.

[0030] The control unit 20 is connected to the current detection module 10 and is used to determine whether the target device is in a running state based on the current detection signal. When it is determined that the target device is in a running state and the duration of the running state meets the preset conditions, it outputs a lockout control signal. When it is determined that the target device is in a stopped state, it outputs a reset control signal.

[0031] The linear beam smoke detector 30 is connected to the control unit 20 and is used to switch to the lockout mode in response to the lockout control signal and to switch to the fire detection mode in response to the reset control signal; the linear beam smoke detector 30 suppresses the alarm output in the lockout mode.

[0032] In this embodiment, the current detection module 10 monitors the power supply current of the target equipment in real time. The control unit 20 determines the operating status based on the current signal and outputs a lockout control signal when the operating status continuously meets preset conditions. This switches the linear beam smoke detector 30 to the lockout mode to suppress alarm output, fundamentally preventing false alarms caused by physical obstruction of the light path during the movement of the target equipment (such as a bridge crane). When the target equipment stops running, the control unit 20 outputs a reset control signal to immediately restore the linear beam smoke detector 30 to the fire detection mode, ensuring that the fire monitoring sensitivity is not affected. The above linkage mechanism, based on the accurate identification of the equipment's operating status, achieves a balance between preventing false alarms and fire detection functions, effectively improving system reliability.

[0033] In conjunction with the first aspect, the control unit 20 includes: a comparison and judgment module 21.

[0034] The comparison and judgment module 21 is used to compare the current value corresponding to the current detection signal with a preset reference threshold, and determine whether the target device is in a running state or a stopped state based on the comparison result.

[0035] Specifically, the input of the comparison and judgment module 21 is the current value corresponding to the current detection signal, and the output is the judgment result of the target device's state. The comparison and judgment module 21 has a built-in preset reference threshold, which is a critical current value that distinguishes whether the target device is in a running state or a stopped state. It can be preset and stored in the control unit 20 according to the rated power, starting current and other parameters of the target device (e.g., a bridge crane).

[0036] In practical operation, the comparison and judgment module 21 compares the received current value with a preset reference threshold: When the current value is greater than or equal to the preset reference threshold, the comparison and judgment module 21 determines that the target device is in operation (or may have been started). When the current value is less than the preset reference threshold, the comparison and judgment module 21 determines that the target device is in a stopped state.

[0037] The comparison and judgment module 21 outputs the above judgment result as an intermediate judgment signal to other functional modules of the control unit 20 for subsequent delay judgment and output decision of the lockout control signal or reset control signal.

[0038] By setting up the comparison and judgment module 21, the control unit 20 can accurately identify whether the target device is powered on and running based on the current detection signal, thereby providing a reliable basis for the linkage control between the target device's operating status and the detector's working mode. This solution does not require additional position sensors or limit switches; it can achieve status sensing using only the target device's existing power supply line, and has the advantages of simple structure, low cost, and ease of engineering implementation.

[0039] In conjunction with the first aspect, the control unit 20 further includes a delay determination module 22.

[0040] The delay determination module 22 is used to determine whether the duration of the state reaches the preset time threshold when the current value is greater than or equal to the preset reference threshold. If it does, the target device is determined to be in operation.

[0041] Specifically, the delay determination module 22 is connected to the comparison determination module 21 and the control port of the linear beam smoke detector 30, respectively. The input terminal of the delay determination module 22 receives the intermediate determination signal (i.e., the determination result of whether the current value is greater than or equal to the preset reference threshold) output by the comparison determination module 21, and the output terminal outputs the final operating status determination result, and generates corresponding control signals accordingly.

[0042] In practical operation, when the comparison and judgment module 21 determines that the current value is greater than or equal to the preset reference threshold, it indicates that the target device may have started operating. However, at this time, it does not directly determine that the target device is in an operating state. Instead, it uses the current value meeting the threshold as a prerequisite for triggering the delay judgment process. The delay judgment module 22 then starts timing to determine whether the duration of this state (i.e., the state in which the current value is continuously greater than or equal to the preset reference threshold) reaches the preset time threshold. If it does, the delay judgment module 22 ultimately determines that the target device is in an operating state and immediately outputs a blocking control signal to the linear beam smoke detector 30, switching it to the blocking mode. If it does not reach the blocking mode, it does not determine that the target device is in an operating state, does not output a blocking control signal, and the linear beam smoke detector 30 remains in fire detection mode.

[0043] When the comparison and judgment module 21 determines that the current value is less than the preset reference threshold, it indicates that the target device has stopped operating. The delay judgment module 22 then stops outputting the interlocking control signal and instead outputs a reset control signal to restore the linear beam smoke detector 30 to the fire detection mode.

[0044] By setting the delay judgment module 22, the control unit 20 can effectively distinguish between "long-term obstruction caused by continuous operation of the target device" and "short-term current surge caused by instantaneous start-up of the target device or electromagnetic interference", avoiding unnecessary blocking operations triggered by instantaneous current fluctuations, thereby ensuring that the linear beam smoke detector 30 maintains normal fire detection capability during non-target device obstruction, and further improving the system's operational stability and judgment accuracy.

[0045] It is understandable that the preset time threshold can be flexibly set according to factors such as the startup characteristics of the target equipment and the electromagnetic environment to adapt to the actual working conditions of different application scenarios; the aforementioned preset benchmark threshold can be flexibly adjusted according to the electrical characteristics of different types of target equipment to adapt to the needs of different application scenarios. For example, in the generator layer of a pumped storage power station, a corresponding benchmark threshold can be set for the actual power supply parameters of the bridge crane.

[0046] In conjunction with the first aspect, the current detection module 10 includes a non-contact Hall current sensor, which is installed in the power distribution box of the target device to sense and detect the current in the power supply line.

[0047] Specifically, a Hall current sensor is a current detection element based on the Hall effect. When the current being measured flows through a conductor, a magnetic field is generated around the conductor. The Hall element converts this magnetic field into a voltage signal output that is proportional to the magnitude of the current, thereby realizing non-contact current detection.

[0048] The output of the current detection module 10 is connected to the signal input of the control unit 20, transmitting the sensed analog current signal to the ADC digital-to-analog converter interface of the control unit 20 for subsequent signal processing and status determination. By employing a non-contact Hall current sensor, this application achieves accurate detection of the power supply current of the target device while avoiding the need to modify existing power supply lines as required by traditional contact detection schemes (such as series resistors or current transformers that need to be connected to the line). This reduces installation difficulty and safety risks, making it particularly suitable for the renovation and upgrading of existing industrial sites such as pumped storage power stations.

[0049] It is understood that the non-contact Hall current sensor can be an open-close type Hall current sensor, or other current sensing elements with non-contact detection function. Its range and accuracy can be adapted and selected according to the rated current and detection requirements of the target equipment.

[0050] In conjunction with the first aspect, the Hall current sensor has an openable / closing structure and is snapped onto the outside of the live wire of the main power supply line of the power distribution box.

[0051] Specifically, the open-close Hall current sensor, also known as a clamp-on current sensor, has a magnetic circuit structure consisting of a fixed part and a movable part, which are hinged together by a pivot. Normally, they can open to a certain angle. During installation, the operator presses the movable part to open the sensor jaws, inserts the conductor to be measured (i.e., the live wire of the main power supply line) into the center of the jaws, and releases it. The movable part automatically closes under the action of a return spring, causing the sensor's magnetic circuit to form a complete closed magnetic circuit around the conductor being measured, thus achieving non-contact inductive measurement of the current. The entire installation process requires no disconnection of the power supply line, no stripping of the conductor insulation, and no welding or wiring modifications to complete the sensor installation.

[0052] The signal output terminal of the Hall current sensor is connected to the ADC digital-to-analog converter interface of the control unit 20 via a shielded signal cable. After being snapped in place, the sensor enters a continuous working state, converting the current signal in the main power supply line into an analog voltage signal in real time and outputting it to the control unit 20 for subsequent signal processing and status determination.

[0053] By adopting a snap-fit ​​structure, the current detection module 10 of this application can be installed without interrupting power supply to the line or interrupting equipment operation. This is particularly suitable for retrofitting in already operational locations such as pumped storage power stations, avoiding the wiring disconnection and power outage work required by traditional current detection schemes (such as current transformers requiring through-hole installation and shunts requiring series connection to the line), significantly reducing construction difficulty and safety risks. At the same time, the snap-fit ​​structure allows the sensor to be flexibly disassembled or relocated as needed, facilitating later maintenance and replacement.

[0054] Example 2 Compared with Embodiment 1, the difference in this application lies in that the control unit 20 in this device includes: a first microcontroller control unit 23 and a second microcontroller control unit 24, such as... Figure 2 As shown.

[0055] The first microcontroller control unit 23 is connected to the current detection module 10 and is used to receive the current detection signal and perform analog-to-digital conversion processing.

[0056] The second microcontroller control unit 24 is communicatively connected to the first microcontroller control unit 23, and is used to receive the converted signal, determine the status, and output the lockout control signal or the reset control signal.

[0057] Specifically, the first microcontroller control unit 23 has a built-in ADC (Analog-to-Digital Converter) interface. This interface receives the analog current signal output by the current detection module 10 and converts it into a digital signal for subsequent digital domain processing. The digital signal after analog-to-digital conversion can be further filtered by the software filtering algorithms (such as median filtering and mean filtering) built into the first microcontroller control unit 23 to eliminate signal distortion caused by electromagnetic interference and other factors, thereby obtaining stable and reliable current value data.

[0058] The second microcontroller control unit 24 receives the digital current signal sent by the first microcontroller control unit 23 through a communication interface (such as UART serial port, I²C bus, SPI bus, or custom IO protocol, etc.) and performs state determination based on the signal, including: comparing the current value with a preset reference threshold, and determining whether the duration of the current value meeting the standard has reached a preset time threshold, etc. Based on the determination result, the second microcontroller control unit 24 outputs a corresponding interlocking control signal or reset control signal to the control port of the linear beam smoke detector 30, controlling the linear beam smoke detector 30 to switch between interlocking mode and fire detection mode.

[0059] By dividing the functions of the first microcontroller control unit 23 and the second microcontroller control unit 24, this application achieves the physical separation of the signal acquisition front-end and the logic control back-end: the first microcontroller control unit 23 is dedicated to signal conditioning and data acquisition, and is located close to the current detection module 10, which helps to shorten the analog signal transmission path and reduce signal attenuation and interference introduction; the second microcontroller control unit 24 is dedicated to logic judgment and control output, and can be flexibly arranged on the side of the linear beam smoke detector 30 or other locations that are easy to maintain. The dual microcontroller architecture decouples the signal acquisition and control logic at the physical level, which reduces the computational burden of a single control unit and improves the system's anti-interference capability and deployment flexibility, especially suitable for engineering scenarios where there is a certain physical distance between the distribution box and the detector installation location in a pumped storage power station.

[0060] It should be noted that the comparison and judgment module 21 and the delay judgment module 22 in Embodiment 1 are logic modules based on functional division. Their physical carriers can be the same microcontroller, two microcontrollers, or other control chips or logic circuits with data processing capabilities. For example, in a specific implementation of the dual-microcontroller architecture, the functions corresponding to the comparison and judgment module and the delay judgment module are both implemented by the second microcontroller control unit 24 through software programs, while the first microcontroller control unit 23 is specifically used for analog signal acquisition and digital preprocessing. Those skilled in the art should understand that the above division of functional modules is only used to describe the technical concept of this application and does not constitute any limitation on the physical implementation of the control unit 20.

[0061] In conjunction with the first aspect, the first microcontroller control unit 23 includes: an ADC digital-to-analog conversion interface 231 and a filtering module 232; The analog signal of the current detection signal is converted into a digital signal by the ADC digital-to-analog converter interface 231, and the interference signal is filtered out by the filter module 232.

[0062] Specifically, the ADC (Analog-to-Digital Converter) interface 231 is an analog signal acquisition port built into or external to the first microcontroller control unit 23. It is used to receive the analog current signal output by the current detection module 10 (i.e., the non-contact Hall current sensor) and convert it into a digital signal for subsequent processing in the digital domain. The signal output by the Hall current sensor is an analog voltage signal, the amplitude of which is proportional to the magnitude of the power supply current of the target device. After the signal is transmitted to the first microcontroller control unit 23 via the signal line, the ADC interface 231 performs analog-to-digital conversion according to a preset sampling frequency and quantization accuracy (e.g., 12-bit resolution), converting the continuously changing analog voltage into a discrete digital quantity, thereby facilitating numerical calculations and logical judgments by the microcontroller.

[0063] The filtering module 232 can be a digital filtering module implemented by software algorithms, or a composite filtering module combining hardware filtering circuits and software filtering. In this application, the filtering module 232 is used to filter the digital signal converted by the ADC digital-to-analog converter interface 231. Because the main building of the pumped storage power station contains a large number of electrical devices, the electromagnetic environment is complex. The power supply line of the target equipment (bridge crane) may contain interference components such as harmonics, surges, and high-frequency noise, causing instantaneous fluctuations in the detected current signal. After receiving the digital signal output by the ADC digital-to-analog converter interface 231, the filtering module 232 smooths the digital signal sequence using a preset digital filtering algorithm (such as median filtering, arithmetic mean filtering, moving average filtering, or Kalman filtering), filtering out high-frequency noise and abnormal spikes caused by electromagnetic interference and other factors, obtaining stable and reliable current value data, and then transmitting this current value data to the second microcontroller control unit 24 for status determination. The filter module 232 effectively avoids the interference of instantaneous current fluctuations caused by external factors such as electromagnetic interference on the determination results of the target equipment's operating status, thereby improving the system's anti-interference capability and determination accuracy.

[0064] By setting up the ADC digital-to-analog conversion interface 231 and the filtering module 232, this application realizes the accurate digital acquisition and noise filtering of the current detection analog signal, providing a reliable data foundation for the subsequent control unit 20 to accurately determine the operating status of the target device.

[0065] Understandably, the filter module 232 can employ software filtering, hardware filtering circuits (such as RC low-pass filtering, active filtering, etc.), or a multi-stage filtering architecture combining software and hardware, which can be adapted and selected according to the actual electromagnetic environment and accuracy requirements. The type and parameters of the filtering algorithm can also be flexibly adjusted based on the on-site debugging results to obtain a stable current detection signal under different operating conditions.

[0066] In conjunction with the first aspect, the interlocking control signal is a low-level signal, the reset control signal is a high-level signal, and the linear beam smoke detector receives the low-level signal or the high-level signal through its control port.

[0067] Specifically, the output port of the second microcontroller control unit 24 is connected to the control port of the linear beam smoke detector 30 via a signal line. The second microcontroller control unit 24 has a built-in general-purpose input / output interface, which can be programmed to output high-level (e.g., +3.3V or +5V, depending on the microcontroller's power supply voltage) or low-level (0V or near 0V) signals. In this application, the second microcontroller control unit 24 uses the high or low level of the signal as the carrier of control commands to transmit control commands to the linear beam smoke detector 30.

[0068] In practical operation, when the second microcontroller control unit 24 determines that the target device is in operation, it pulls the level of the designated output I / O port low. This low-level signal is transmitted to the control port of the linear beam smoke detector 30 through the signal line. The internal control circuit (such as a transistor or optocoupler isolation circuit) of the linear beam smoke detector 30 continuously monitors the level status of its control port: when the control port detects a low level, the internal logic circuit of the linear beam smoke detector 30 determines that a lockout command has been received, and then switches to the lockout mode to suppress the alarm output and prevent false alarm signals from being uploaded to the fire alarm control panel.

[0069] When the second microcontroller control unit 24 determines that the target device is in a stopped state, it pulls the output I / O port level high, and this high-level signal is transmitted to the control port of the beam smoke detector 30. After detecting the high level, the beam smoke detector 30 determines that a reset command has been received, immediately releases the lockout state, switches back to fire detection mode, and restores normal fire monitoring functions.

[0070] By employing high or low level signals as the carrier of control commands, this application achieves simple, reliable, and real-time communication between the control unit 20 and the linear beam smoke detector 30. Level signal control has the following advantages: First, the signal form is simple, and the detector end does not require complex communication protocol parsing circuits; commands can be recognized simply through ordinary input I / O ports, facilitating low-cost interface modification of existing detectors. Second, level signals have strong anti-interference capabilities, possessing ample noise margin between high and low level states, enabling reliable transmission in the complex electromagnetic environment of pumped storage power stations and avoiding misinterpretation of control commands due to signal distortion.

[0071] It is understood that the above-described level polarity correspondence (low-level latching, high-level reset) is only an exemplary implementation. In some embodiments, if the control port of the linear beam smoke detector 30 is configured to be high-level active trigger (i.e., high-level trigger latching mode), the polarity of the control signal can be interchanged accordingly. That is, the latching control signal is a high-level signal and the reset control signal is a low-level signal, and the same latching and reset functions can still be achieved. The specific configuration of the level polarity depends on the input logic definition of the detector control port, and this application does not limit it.

[0072] Secondly, embodiments of this application provide a control method for a beam smoke detection device, which is applied to the device as described in Embodiment 1. Combined with Figure 3 As shown, the method includes: S110 detects the power supply current of the target device and obtains a current detection signal.

[0073] S120 determines whether the target device is in operation based on the current detection signal.

[0074] S130: When it is determined that the target device is in operation, an interlock control signal is output to the linear beam smoke detector to control the linear beam smoke detector to switch to the interlock mode. In the interlock mode, the linear beam smoke detector suppresses the alarm output.

[0075] S140: When the target device is determined to be in a stopped state, a reset control signal is output to the linear beam smoke detector to control the linear beam smoke detector to switch to fire detection mode.

[0076] Specifically, step S110 is executed by the current detection module 10. The current detection module 10 employs a non-contact, open-close Hall current sensor, installed inside the power distribution box of the target equipment (e.g., a bridge crane), and snapped onto the outside of the live wire of the main power supply line. Based on the Hall effect principle, when the target equipment is powered on, the power supply current generates a magnetic field around the live wire. The Hall element converts this magnetic field into an analog voltage signal proportional to the current magnitude, thereby achieving non-contact real-time detection of the power supply current. The current detection module 10 uses the detected analog current signal as a current detection signal and transmits it to the control unit 20 via a signal line for subsequent processing and judgment. This detection process is continuous and unaffected by the start / stop status of the target equipment, ensuring that the control unit 20 can obtain the power supply current information of the target equipment in real time.

[0077] Step S120 is executed by control unit 20. After receiving the analog current signal sent by current detection module 10, control unit 20 first converts the analog signal into a digital signal through the ADC digital-to-analog converter interface 231 built into the first microcontroller control unit 23. Then, the signal noise caused by electromagnetic interference and other factors is filtered out by the filtering module 232 to obtain stable and reliable current value data. Subsequently, the first microcontroller control unit 23 transmits the processed current value data to the second microcontroller control unit 24.

[0078] After receiving the current value data, the second microcontroller control unit 24 starts the status determination process, which includes two stages: comparison and determination stage and delay determination stage.

[0079] Combination Figure 4 As shown, in the comparison and judgment phase, the obtained current value is compared with a preset reference threshold. The preset reference threshold is a critical current value that distinguishes whether the target device is in a running state or a stopped state. It is preset and stored in the control unit 20 based on the rated power and starting current characteristics of the target device. When the current value is less than the preset reference threshold, it is directly determined that the target device is in a stopped state; when the current value is greater than or equal to the preset reference threshold, it indicates that the target device may have started running, and then the delay judgment phase begins.

[0080] During the delay determination phase, the second microcontroller control unit 24 immediately starts timing to determine whether the duration of the current value being greater than or equal to a preset reference threshold has reached a preset time threshold. If it has, the target device is determined to be in operation; if it has not, the target device is determined not to be in operation, and subsequent interlocking operations are not triggered to avoid misjudgments caused by instantaneous current surges or electromagnetic interference.

[0081] Through the dual verification mechanism combining the above-mentioned comparison judgment and delay judgment, the control unit 20 can accurately identify the actual operating status of the target device, providing a reliable basis for subsequent mode switching of the detector.

[0082] In step S130, when the second microcontroller control unit 24 determines in step S120 that the target device is in operation, it pulls the level of the designated output I / O port low through its built-in general-purpose input / output interface, outputting a low-level latching control signal. This latching control signal is transmitted to the control port of the linear beam smoke detector 30 via a signal line. The linear beam smoke detector 30 continuously monitors the level status of its control port. When a low-level signal is detected, its internal logic circuit determines that a latching command has been received and immediately switches to latching mode.

[0083] In the interlocked mode, the alarm output of the linear beam smoke detector 30 is suppressed: specifically, the linear beam smoke detector 30 suspends its response to infrared beam obstruction signals, maintaining only basic functions such as beam transmission and reception, and does not output any alarm signals to the fire alarm control panel. Since the mechanical structure of the target equipment (such as the metal bridge frame, trolley, and lifting gear of a bridge crane) physically obstructs the detection optical path during operation, a false alarm would inevitably be triggered if the linear beam smoke detector 30 were to operate normally. Through the aforementioned interlocked control, false alarm signals can be effectively shielded during the period when the target equipment continuously obstructs the optical path, fundamentally avoiding fire alarm false alarm events caused by physical obstruction.

[0084] When the second microcontroller control unit 24 determines in step S120 that the target device is in a stopped state (i.e., the current value is less than the preset reference threshold), step S140 pulls the level of the specified output IO port high through the built-in general-purpose input or output interface, outputting a high-level reset control signal. This reset control signal is transmitted to the control port of the linear beam smoke detector 30 through the signal line. After the linear beam smoke detector 30 detects that the level of the control port changes from low to high, its internal logic circuit determines that a reset command has been received, immediately releases the lockout state, and switches back to the fire detection mode.

[0085] In fire detection mode, the linear beam smoke detector 30 resumes normal operation, monitoring the attenuation of the infrared beam by smoke particles in the area in real time. Once the infrared light intensity is detected to have attenuated below the alarm threshold, it is determined that there is fire smoke, and a fire alarm signal is promptly output to the fire alarm control panel to ensure that the fire monitoring function is not affected. When the target device restarts, the steps S110 to S140 will be repeated, realizing real-time linkage closed-loop control between the target device's operating status and the detector's working mode. Through the above method, this application realizes adaptive switching of the detector's working mode based on the detection of the target device's power supply current: automatic locking to prevent false alarms during target device operation, and immediate reset to resume fire detection after the target device stops. It takes into account both false alarm prevention and fire monitoring functions, requires no manual intervention, and is fully automated, effectively improving the reliability and intelligence level of the system operation.

[0086] In conjunction with the first aspect, the target equipment is a bridge crane. Step S120 includes: S121, convert the current detection signal into a current value; S122, determine whether the current value is greater than or equal to a preset reference threshold; If not, proceed to step S123; if yes, proceed to step S124.

[0087] S123, determine that the target device is in a stopped state; S124, determine whether the duration for which the current value is greater than or equal to the preset reference threshold has reached the preset time threshold.

[0088] If yes, proceed to step S125; otherwise, proceed to step S126.

[0089] S125, it is determined that the target device is in operation.

[0090] S126, It is determined that the target device is not in operation.

[0091] Step S121 is executed by the first microcontroller control unit 23. The first microcontroller control unit 23 receives the analog current signal output from the current detection module 10 (i.e., the non-contact Hall current sensor) through its ADC digital-to-analog conversion interface 231, performs analog-to-digital conversion according to a preset sampling frequency and quantization precision (e.g., 12-bit resolution), converting the continuously changing analog voltage into a discrete digital quantity. The digital signal after analog-to-digital conversion is further processed by the filtering module 232. The filtering module 232 uses a preset digital filtering algorithm (e.g., median filtering, moving average filtering, etc.) to filter out high-frequency noise and abnormal spikes caused by electromagnetic interference and other factors, obtaining stable and reliable current value data.

[0092] Step S122 is executed by the comparison and judgment module 21 in the second microcontroller control unit 24. The comparison and judgment module 21 receives the current value data sent by the first microcontroller control unit 23 and compares the current value with a preset reference threshold. The preset reference threshold is a critical current value that distinguishes between the running state and the stopped state of the bridge crane. It is preset and stored in the storage unit of the second microcontroller control unit 24 based on the rated power, starting current, and standby current of the bridge crane. After the preset reference threshold is set, it can be adjusted according to the actual working conditions to adapt to the electrical characteristics of different models of bridge cranes.

[0093] When the comparison and judgment module 21 determines that the current value is less than the preset benchmark threshold in step S122, it indicates that the bridge crane is not powered on or its power supply current has not reached the operating characteristic value (e.g., it is in standby or power-off state). The comparison and judgment module 21 then outputs the judgment result of "stop state". At this time, the second microcontroller control unit 24 does not output the interlocking control signal, but instead outputs a high-level reset control signal to the control port of the linear beam smoke detector 30, so that the linear beam smoke detector 30 remains in the fire detection mode or switches back to the fire detection mode, ensuring the continuous effectiveness of the fire monitoring function.

[0094] When the comparison and judgment module 21 determines in step S122 that the current value is greater than or equal to the preset reference threshold, it indicates that the bridge crane may have started operation. However, it has not yet been directly determined to be in operation. Instead, it triggers the delay judgment module 22 to enter the delay judgment process. The delay judgment module 22 then starts timing, continuously monitoring the duration of the current value being greater than or equal to the preset reference threshold, and comparing this duration with the preset time threshold. The preset time threshold is a pre-set time length (e.g., 3 seconds, 5 seconds, or 10 seconds, which can be flexibly configured according to the starting characteristics of the bridge crane and the on-site electromagnetic environment). It is used to distinguish between long-term obstruction caused by the continuous operation of the bridge crane and short-term current impact caused by the instantaneous start of the bridge crane, electromagnetic interference, or surge current.

[0095] When the delay determination module 22 determines in step S124 that the duration for which the current value is greater than or equal to the preset reference threshold reaches the preset time threshold, it confirms that the current compliance state is not caused by a momentary disturbance, but rather is a manifestation of the bridge crane's actual continuous operation. The delay determination module 22 then determines that the bridge crane is in operation and outputs the determination result to the control signal output terminal of the control unit 20. The second microcontroller control unit 24 then outputs a low-level interlocking control signal to the control port of the linear beam smoke detector 30, controlling the beam smoke detector 30 to switch to the interlocking mode, thereby effectively suppressing alarm output and avoiding false alarms during the period when the bridge crane continuously blocks the detection light path.

[0096] When the delay judgment module 22 determines in step S124 that the duration for which the current value is greater than or equal to the preset reference threshold has not reached the preset time threshold, it indicates that the current compliance state is a brief current fluctuation (such as a momentary current surge caused by the instantaneous start and stop of the bridge crane, electromagnetic interference, or power grid voltage fluctuations), rather than a true continuous operating state. At this time, the delay judgment module 22 determines that the bridge crane is not in operation and does not output a lockout control signal, and the linear beam smoke detector 30 continues to operate normally in fire detection mode. Through the above-mentioned delay judgment mechanism, unnecessary lockout operations triggered by instantaneous current surges caused by external factors can be effectively avoided, further improving the system's judgment accuracy and operational stability.

[0097] Through the above steps S121~S126, this application realizes accurate determination of the operating status of a bridge crane based on current detection signals. Based on a dual verification mechanism (threshold comparison and delay determination coordination), it takes into account both the accuracy of status identification and anti-interference ability, and provides a reliable basis for the correct switching of the subsequent detector working mode.

[0098] Thirdly, embodiments of this application provide an electronic device, combined with Figure 5As shown, the electronic device includes a memory 131 and a processor 130. The memory 131 stores a computer program, and the processor 130 runs the computer program to make the electronic device perform the above-described method.

[0099] Furthermore, combined Figure 5 The electronic device shown also includes a bus 132 and a communication interface 133, with the processor 130, the communication interface 133 and the memory 131 connected via the bus 132.

[0100] The memory 131 may include high-speed random access memory (RAM) and may also include non-volatile memory, such as at least one disk storage device. Communication between this system network element and at least one other network element is achieved through at least one communication interface 133 (which can be wired or wireless), such as the Internet, wide area network, local area network, metropolitan area network, etc. The bus 132 may be an ISA bus, PCI bus, or EISA bus, etc. The bus can be divided into address bus, data bus, control bus, etc. For ease of representation, Figure 5 The symbol is represented by a single double-headed arrow, but this does not mean that there is only one bus or one type of bus.

[0101] Processor 130 may be an integrated circuit chip with signal processing capabilities. In implementation, each step of the above method can be completed by the integrated logic circuitry in the hardware of processor 130 or by instructions in software form. Processor 130 may be a general-purpose processor, including a Central Processing Unit (CPU), a Network Processor (NP), etc.; it may also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field-Programmable Gate Array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of this invention. The general-purpose processor may be a microprocessor or any conventional processor. The steps of the methods disclosed in the embodiments of this invention can be directly manifested as execution by a hardware decoding processor, or execution by a combination of hardware and software modules in the decoding processor. The software module can reside in a mature storage medium in the art, such as random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, or registers. This storage medium is located in memory 131, and processor 130 reads the information in memory 131 and, in conjunction with its hardware, completes the steps of the method described in the foregoing embodiments.

[0102] Fourthly, embodiments of this application provide a readable storage medium storing computer program instructions, which are read and executed by a processor to perform the above-described method.

[0103] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working process of the system and apparatus described above can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0104] Furthermore, in the description of the embodiments of the present invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention based on the specific circumstances.

[0105] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this invention, essentially, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0106] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0107] Finally, it should be noted that the above embodiments are merely specific implementations of the present invention, used to illustrate the technical solutions of the present invention, and not to limit it. The scope of protection of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments within the technical scope disclosed in the present invention, or make equivalent substitutions for some of the technical features; and these modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A beam-based smoke detection device, characterized in that, include: The current detection module is used to detect the power supply current of the target device and output a current detection signal; The control unit, connected to the current detection module, is used to determine whether the target device is in a running state based on the current detection signal. When the target device is determined to be in a running state and the duration of the running state meets a preset condition, a lockout control signal is output. When the target device is determined to be in a stopped state, a reset control signal is output. A linear beam smoke detector, connected to the control unit, is used to switch to a locked mode in response to the lockout control signal and to switch to a fire detection mode in response to the reset control signal; the linear beam smoke detector suppresses alarm output in the locked mode.

2. The apparatus according to claim 1, characterized in that, The control unit includes: The comparison and judgment module is used to compare the current value corresponding to the current detection signal with a preset reference threshold, and determine whether the target device is in a running state or a stopped state based on the comparison result.

3. The apparatus according to claim 2, characterized in that, The control unit further includes: The delay determination module is used to determine whether the duration of the state reaches a preset time threshold when the current value is greater than or equal to the preset reference threshold. If it does, the target device is determined to be in operation.

4. The apparatus according to claim 1, characterized in that, The current detection module includes a non-contact Hall current sensor, which is installed in the power distribution box of the target device to sense and detect the current in the power supply line.

5. The apparatus according to claim 4, characterized in that, The Hall current sensor has an openable / closing structure and is snapped onto the outside of the live wire of the main power supply line of the power distribution box.

6. The apparatus according to claim 1, characterized in that, The control unit includes: The first microcontroller control unit is connected to the current detection module and is used to receive the current detection signal and perform analog-to-digital conversion processing. The second microcontroller control unit is communicatively connected to the first microcontroller control unit. It is used to receive the converted signal, determine the status, and output the lockout control signal or the reset control signal.

7. The apparatus according to claim 6, characterized in that, The first microcontroller control unit includes: an ADC digital-to-analog converter interface and a filtering module; The analog signal of the current detection signal is converted into a digital signal by the ADC digital-to-analog converter interface, and the interference signal is filtered out by the filtering module.

8. The apparatus according to claim 1, characterized in that, The interlocking control signal is a low-level signal, the reset control signal is a high-level signal, and the linear beam smoke detector receives the low-level signal or the high-level signal through its control port.

9. A control method for a beam smoke detection device, characterized in that, The method is applied to the apparatus as described in any one of claims 1-8; the method includes: Detect the power supply current of the target device and obtain the current detection signal; Based on the current detection signal, it is determined whether the target device is in operation. When it is determined that the target device is in operation, a lockout control signal is output to the linear beam smoke detector to control the linear beam smoke detector to switch to the lockout mode. In the lockout mode, the linear beam smoke detector suppresses the alarm output. When the target device is determined to be in a stopped state, a reset control signal is output to the linear beam smoke detector to control the linear beam smoke detector to switch to fire detection mode.

10. The method according to claim 9, characterized in that, The target equipment is a bridge crane; The step of determining whether the target device is in operation based on the current detection signal includes: The current detection signal is converted into a current value; Determine whether the current value is greater than or equal to a preset reference threshold; If not, the target device is determined to be in a stopped state; If so, determine whether the duration for which the current value is greater than or equal to the preset reference threshold has reached a preset time threshold; If so, the target device is determined to be in operation. If not, the target device is determined to be not in operation.

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