Intelligent linkage dust removal method and device of mine monitoring camera and broadcasting system

Abstract

The application discloses a kind of intelligent linkage dust removal device and method of mine monitoring camera and broadcast system, belong to mine video monitoring technical field.It includes: obtaining dust concentration data and / or image definition data, when any data exceeds threshold value, generate cleaning trigger signal;Response to signal control broadcast system to play voice prompt;Subsequently control air jet device to lens is pulsed blowoff.The device includes dust monitoring module, video definition analysis module, control unit, broadcast linkage module and cleaning execution module.The application realizes on-demand automatic cleaning, reduces artificial maintenance cost by more than 80%, ensures personnel safety through broadcast linkage, and makes full use of existing pressure air pipeline and monitoring system in mine, is convenient to transform, applicable to high dust underground environment.

Description

Technical Field

[0001] This invention relates to the field of mine video surveillance technology, and in particular to an intelligent linkage dust removal method and device for mine surveillance cameras and broadcasting systems. Background Technology

[0002] In underground mining operations, large amounts of dust are generated during extraction, transportation, and crushing. Surveillance cameras, acting as "electronic eyes" underground, play a crucial role in safety management, personnel scheduling, and accident tracing. However, the following problems exist in practical applications: Severe dust accumulation on camera lenses: The high dust concentration in underground tunnels makes it easy for dust to adhere to the camera lens, resulting in blurry, distorted, or even completely malfunctioning monitoring images.

[0003] Manual cleaning is inefficient: Currently, maintenance personnel mainly rely on regular or irregular manual wiping of the cameras. Due to the wide distribution and large number of underground cameras, the workload of manual cleaning is enormous, and untimely cleaning can lead to blind spots in monitoring.

[0004] Inappropriate cleaning timing: Manual cleaning is often carried out only at fixed intervals or after a fault is discovered, rather than proactively cleaning when dust concentration increases, resulting in a lag.

[0005] Lack of linkage mechanism: The existing monitoring system is independent of the dust monitoring system and the broadcasting system, and has failed to achieve data sharing and collaborative control.

[0006] Therefore, there is an urgent need for a device and method that can automatically, intelligently, and collaboratively remove dust from cameras. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a method and device for intelligent linkage dust removal between mining monitoring cameras and broadcasting systems.

[0008] To solve the above technical problems, the technical solution of the present invention is as follows: A method for intelligently linking a mining surveillance camera with a broadcasting system for dust removal includes the following steps: Step S1: Obtain dust concentration data of the area corresponding to the lens of the downhole monitoring camera and image clarity data acquired by the monitoring camera; Step S2: When the dust concentration data exceeds a preset concentration threshold and the duration exceeds a first preset time, or when the image clarity data is lower than a preset clarity threshold, a cleaning trigger signal is generated; Step S3: Control the jet device installed on the surveillance camera to perform pulse-type blowing on the lens of the surveillance camera.

[0009] On the other hand, the present invention also provides an intelligent linkage dust removal device for a mining monitoring camera and a broadcasting system, used to implement the above-mentioned method, comprising: The dust monitoring module is used to acquire dust concentration data in the area corresponding to the lens of the underground monitoring camera; The sharpness analysis module is used to acquire image sharpness data captured by the surveillance camera; The control unit is connected to the dust monitoring module and the video clarity analysis module respectively, and is used to generate a cleaning trigger signal based on the dust concentration data and the image clarity data, and output a cleaning execution command in response to the cleaning trigger signal; The cleaning execution module, installed on the monitoring camera, includes a solenoid valve, a fan-shaped jet nozzle, and an interface for connecting to the downhole compressed air pipeline. The cleaning execution module is used to control the solenoid valve to open according to the cleaning execution command, and to perform pulse-style purging on the lens of the monitoring camera through the fan-shaped jet nozzle.

[0010] The beneficial effects of this invention are: (1) This invention, through the dual triggering conditions of "dust concentration data exceeding the threshold and the duration exceeding the preset time" and "image clarity data falling below the threshold", can simultaneously determine the cleaning needs based on the environmental dust concentration and the actual image quality. Compared with the existing technology of cleaning only after fixed periods or manual visual inspection, this invention can actively trigger cleaning as soon as the lens gets dirty, thereby avoiding blind spots caused by continuous blurring of the monitoring image and improving the real-time performance and reliability of underground safety monitoring.

[0011] (2) This invention employs pulse-type purging cleaning and an air curtain barrier mode, which can automatically complete the vast majority of cleaning tasks. According to calculations based on actual working conditions underground, it can reduce the frequency of manual cleaning of cameras by more than 80%. Maintenance personnel do not need to frequently enter high-dust, high-risk areas for wiping operations, thereby significantly reducing labor intensity and safety hazards.

[0012] (3) The present invention adds an "air curtain barrier mode". During periods when pulse purging is not performed, compressed air is continuously released at a low flow rate of 0.5-1 L / min by controlling the jet device to form a fan-shaped air curtain in front of the lens. This air curtain can actively blow the dust particles suspended in the air away from the lens surface, making it difficult for dust to adhere, thereby reducing the dust accumulation rate from the source, further extending the deep cleaning cycle, reducing system energy consumption and valve operation frequency, and improving the overall lifespan. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 A flowchart illustrating the intelligent linkage dust removal method between a mining monitoring camera and a broadcasting system provided by the present invention; Figure 2 A schematic diagram of the framework of the intelligent linkage dust removal device for mining monitoring cameras and broadcasting systems provided by the present invention. Detailed Implementation

[0015] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0016] Example 1: This example provides an intelligent linkage dust removal method between a mine monitoring camera and a broadcasting system. See [link to example]. Figure 1 This includes the following steps: Step S1: Obtain dust concentration data and image clarity data of the area corresponding to the lens of the downhole monitoring camera.

[0017] Specifically, the control unit (which can be the host computer software in the well dispatch center, or an explosion-proof PLC or embedded controller installed near the camera) receives two types of data in real time: one type comes from the dust concentration sensor deployed in the downhole monitoring system, which transmits the dust concentration data of the area where the camera is located to the control unit via RS485 or Ethernet; the other type comes from the video clarity analysis module, which runs in the intelligent chip built into the control unit or camera and uses an image clarity evaluation algorithm based on edge detection to calculate the clarity value of the current monitoring image in real time.

[0018] Step S2: When the dust concentration data exceeds the preset concentration threshold and the duration exceeds the first preset time, or when the image clarity data is lower than the preset clarity threshold, a cleaning trigger signal is generated.

[0019] Specifically, the control unit has two judgment conditions set inside: Condition A (Dust Concentration Trigger): If the dust concentration data exceeds the preset concentration threshold (e.g., 10 mg / m³) and the duration of this state exceeds the first preset time (e.g., 5 minutes), it is determined that the dust environment has posed a threat to the lens cleanliness.

[0020] Condition B (Image Blur Trigger): If the image clarity data is lower than the preset clarity threshold (for example, according to laboratory calibration, the clarity score is lower than 0.6), the image is determined to be obviously blurry, which directly affects the monitoring effect.

[0021] When either condition A or condition B is met, the control unit immediately generates a cleaning trigger signal. This dual trigger mechanism ensures that the system can intervene in advance in high-dust environments, and also clean in a timely manner when the image is blurred due to other reasons (such as mud on the lens) even in low-dust environments.

[0022] Step S3: Control the jet device installed on the surveillance camera to perform pulsed blowing on the lens of the surveillance camera.

[0023] Specifically, the control unit outputs a cleaning execution command. This command directly or via a relay controls the solenoid valve in the cleaning execution module mounted on the camera. The solenoid valve is normally closed, opening when energized and closing when de-energized. Compressed air (typically 0.5-0.8 MPa) from the downhole compressed air pipeline enters the solenoid valve through the pipeline interface and is then ejected through a fan-shaped nozzle. The fan-shaped nozzle is mounted on the side or top of the lens, with its spray direction aligned with the center of the lens surface. The spray angle is adjustable to cover the entire lens surface.

[0024] The control unit performs pulse-type control of the solenoid valve: first, the solenoid valve is opened for 2-5 seconds (e.g., 3 seconds) to perform one purging cycle; then it is closed for 1 second; it is opened again for 2-5 seconds to perform a second purging cycle; this can be repeated 2-3 times as needed. Compared to continuous purging, this pulse-type purging generates a stronger instantaneous impact force each time it is opened, effectively removing firmly attached dust while saving compressed air consumption. During the purging process, compressed air forms a high-speed airflow on the lens surface, blowing dust off the lens surface and dispersing it into the air in the channel.

[0025] Preferably, after generating the cleaning trigger signal, the control unit sends a command to the IP broadcast terminal in the area where the camera is located via the broadcast linkage module. This command includes a preset voice prompt file name or text content. Upon receiving the command, the broadcast terminal immediately plays the voice prompt, such as: "The surveillance cameras in this area are about to undergo automatic cleaning. Please give way. The cleaning process will last approximately 5 seconds." The playback priority of this voice prompt can be set higher than regular broadcasts to ensure clear visibility in noisy underground environments. The playback volume can be adjusted according to the noise level at the site. The prompt clearly indicates the cleaning duration to facilitate safe maneuvering. After issuing the broadcast command, the control unit waits for a short delay (e.g., 1-2 seconds) to ensure that the voice prompt has been played completely or at least the critical warning portion has been played before executing the cleaning steps.

[0026] Step S4: Verify the cleaning effect.

[0027] Specifically, after the final pulse purging is completed, the control unit again retrieves the cleaned image sharpness data from the video sharpness analysis module. This data is then compared with a sharpness threshold. If the clarity data after cleaning is higher than the first clarity threshold, the cleaning is considered successful, and the cleaning process ends. The control unit can record a "success" log.

[0028] If the clarity data remains below the clarity threshold after cleaning, the cleaning is deemed incomplete, and the control unit automatically repeats step three (another pulse purging). The system is set to a maximum of N=2 repetitions (i.e., a maximum of 2 repetitions, for a total of 3 cleaning rounds). A broadcast prompt will be given before each repetition to ensure continued safety.

[0029] If the resolution data remains below the threshold after N repetitions, the control unit generates a maintenance alarm signal and sends it to the host computer (ground dispatch center) via Ethernet or other communication methods. Upon receiving the alarm, dispatch center personnel can arrange for someone to go down into the well to check for physical damage to the camera (such as lens wear, nozzle blockage, etc.).

[0030] In addition, during normal periods when pulse purging is not performed, the control unit keeps the solenoid valve in a "micro-open" state. This state can be achieved through PWM (Pulse Width Modulation) control or by using a throttle valve in series with a low-flow solenoid valve. In micro-open mode, the compressed air flow rate is limited to 0.5-1 L / min (adjustable), far lower than the flow rate during pulse purging (which can reach hundreds of liters per minute). A small amount of airflow is continuously ejected from the fan-shaped nozzle, forming a thin and stable fan-shaped air curtain in front of the lens. This air curtain acts as an invisible "wind wall," blowing away dust particles approaching the lens and preventing them from directly depositing on the lens surface. This air curtain barrier significantly reduces the rate of dust accumulation on the lens, extending the pulse purging interval from several hours to several days or even weeks, effectively reducing system operation frequency and air consumption.

[0031] Example 2: This example provides an intelligent linkage dust removal device for a mining monitoring camera and a broadcasting system, used to implement the method provided in Example 1. The device includes: a dust monitoring module 201, a clarity analysis module 202, a control unit 203, a broadcast linkage module 204, and a cleaning execution module 205.

[0032] Specifically, the dust monitoring module 201 is used to acquire dust concentration data in the area corresponding to the lens of the underground monitoring camera. This module utilizes dust concentration sensors already deployed in the existing monitoring system in the mine. The sensor type can be light scattering or electrostatic induction, and the explosion-proof level meets the requirements of underground coal mines. The sensor uploads real-time concentration data in digital signal form via RS485 bus or Ethernet. If the control unit is located underground, the sensor can be directly connected to the communication interface of the control unit; if the control unit is located above ground, the sensor data is first uploaded to the underground ring network, and then forwarded by the host computer or actively read by the control unit.

[0033] The sharpness analysis module 202 is used to acquire image sharpness data captured by the surveillance camera. This module can be a software module running in the control unit (such as an embedded controller) or on the internal chip of the camera with intelligent analysis capabilities. This module implements a classic image sharpness evaluation algorithm, such as edge detection-based sharpness evaluation: using Sobel or Canny operators to extract image edges, and counting the number of edge pixels or the sum of gradient magnitudes as a sharpness score. The sharpness analysis module continuously outputs sharpness values ​​at a certain frame rate (e.g., 1 frame / second) and sends them to the decision logic of the control unit via inter-process communication or network protocols.

[0034] The control unit 203 is connected to the dust monitoring module and the video clarity analysis module respectively. It is used to generate a cleaning trigger signal based on dust concentration data and image clarity data, and output broadcast control commands and cleaning execution commands in response to the cleaning trigger signal.

[0035] The broadcast linkage module 204 is used to convert cleaning commands from the control unit into a command format recognizable by the underground IP broadcast system. The underground IP broadcast system typically consists of a broadcast server, a network switch, and explosion-proof broadcast terminals (speakers). The broadcast linkage module uses UDP or TCP / IP protocols, following the broadcast system's SDK or open protocols (such as SIP, ONVIF, etc.), to send HTTP requests or custom commands to broadcast terminals in a designated area or at a designated IP address, triggering voice playback. The module can be integrated within the control unit (e.g., the host computer software directly calls the broadcast system API), or it can be a standalone network protocol converter.

[0036] The cleaning execution module 205 is mounted on the monitoring camera and includes a solenoid valve, a fan-shaped jet nozzle, and an interface for connecting to the downhole compressed air pipeline. The cleaning execution module controls the solenoid valve to open according to cleaning execution commands, and uses the fan-shaped jet nozzle to perform pulse-style purging of the monitoring camera lens.

[0037] Therefore, the technical solution of this application realizes automatic cleaning on demand, reduces manual maintenance costs by more than 80%, ensures personnel safety through broadcast linkage, makes full use of existing underground compressed air pipelines and monitoring systems, is easy to modify, and is suitable for high dust underground environments.

[0038] In addition to the above embodiments, the present invention may have other implementation methods; all technical solutions formed by equivalent substitution or equivalent transformation fall within the protection scope claimed by the present invention.

Claims

1. A method for intelligent linkage dust removal between a mining monitoring camera and a broadcasting system, characterized in that: Includes the following steps: Step S1: Obtain dust concentration data of the area corresponding to the lens of the downhole monitoring camera and image clarity data acquired by the monitoring camera; Step S2: When the dust concentration data exceeds a preset concentration threshold and the duration exceeds a first preset time, or when the image clarity data is lower than a preset clarity threshold, a cleaning trigger signal is generated; Step S3: Control the jet device installed on the surveillance camera to perform pulse-type blowing on the lens of the surveillance camera.

2. The intelligent linkage dust removal method between a mining monitoring camera and a broadcasting system according to claim 1, characterized in that: The control of the jet device installed on the surveillance camera to perform pulse-style blowing on the lens of the surveillance camera includes: The solenoid valve is opened to allow compressed air from the downhole compressed air pipeline to blow through the fan-shaped nozzle onto the lens surface.

3. The intelligent linkage dust removal method between a mining monitoring camera and a broadcasting system according to claim 2, characterized in that: The process of blowing the lens surface includes: Control the duration of each purging cycle to 2-5 seconds, and repeat the purging 2-3 times, with a 1-second interval between each purging.

4. The intelligent linkage dust removal method between a mining monitoring camera and a broadcasting system according to claim 1, characterized in that: Before the jet device mounted on the surveillance camera performs pulsed blowing on the lens of the surveillance camera, the method further includes: In response to the cleaning trigger signal, the broadcast system corresponding to the area where the surveillance camera is located is controlled to play a preset voice prompt.

5. The intelligent linkage dust removal method between a mining monitoring camera and a broadcasting system according to claim 1, characterized in that: After the air jet device installed on the surveillance camera performs pulsed blowing on the lens of the surveillance camera, the process further includes verifying the cleaning effect, which includes: After completing the pulsed purging, the image sharpness data is acquired again. If the image sharpness data is restored to a level higher than the sharpness threshold, the cleaning process ends. If the image sharpness data is still lower than the sharpness threshold, then repeat step S3; If the image clarity data is still lower than the clarity threshold after repeating the preset number of times, a maintenance alarm signal is generated and sent to the host computer.

6. The intelligent linkage dust removal method between a mining monitoring camera and a broadcasting system according to claim 1, characterized in that: Also includes: During periods when the pulsed purging is not performed, the jet device is controlled to continuously release compressed air at a set flow rate less than the purging flow rate, forming an air curtain barrier in front of the lens to block dust.

7. The intelligent linkage dust removal method between a mining monitoring camera and a broadcasting system according to claim 6, characterized in that: The preset flow rate is 0.5~1L / min.

8. A smart linkage dust removal device for a mining monitoring camera and broadcasting system, used to implement the method according to any one of claims 1 to 7, characterized in that, include: The dust monitoring module is used to acquire dust concentration data in the area corresponding to the lens of the underground monitoring camera; The sharpness analysis module is used to acquire image sharpness data captured by the surveillance camera; The control unit is connected to the dust monitoring module and the video clarity analysis module respectively, and is used to generate a cleaning trigger signal based on the dust concentration data and the image clarity data, and output a cleaning execution command in response to the cleaning trigger signal; The cleaning execution module, installed on the monitoring camera, includes a solenoid valve, a fan-shaped jet nozzle, and an interface for connecting to the downhole compressed air pipeline. The cleaning execution module is used to control the solenoid valve to open according to the cleaning execution command, and to perform pulse-style purging on the lens of the monitoring camera through the fan-shaped jet nozzle.

9. The intelligent linkage dust removal device for mining monitoring cameras and broadcasting systems according to claim 8, characterized in that: It also includes a broadcast linkage module, which is connected to the control unit and the underground broadcast system, and is used to control the playback of preset voice prompts according to the broadcast control instructions.

10. The intelligent linkage dust removal device for mining monitoring cameras and broadcasting systems according to claim 8, characterized in that: The control unit can be any one of a host computer, an explosion-proof PLC for underground mining, or an embedded controller.

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