Intelligent mine intrinsic safety type LED lighting lamp strip and lighting system

Abstract

The present application relates to the technical field of mine lighting, and more particularly to an intelligent mine-used intrinsically safe LED lighting strip and a lighting system, the lighting strip comprising an insulation assembly, a plug-in assembly and a lighting assembly, and the system comprising a production determination module, a light attenuation determination module, a lighting regulation module, a regulation detection module, a shadow determination module and a shadow compensation module; the system predicts high dust working conditions through vibration analysis, and evaluates light attenuation by combining dust concentration and coal rock light absorption rate; the system regulates the brightness and spectrum of the lighting strip according to the evaluation results; the regulation effect is verified through closed-loop detection; dynamic shadow areas are identified based on the device pose and light field distribution; finally, in combination with the safety constraint of gas concentration, the safety priority local compensation or the brightness priority overall brightening is performed on the shadow area. The present application solves the problems that the instantaneous light attenuation caused by the cooperation of the instantaneous dust explosion and the strong light absorption of the coal wall during cutting cannot be effectively responded, and the dynamic shielding shadow caused by the movement of the large body of the mining equipment cannot be effectively responded.

Description

Technical Field

[0001] This invention relates to the field of mine lighting technology, and in particular to an intelligent intrinsically safe LED lighting strip and lighting system for mining applications. Background Technology

[0002] The underground mining face in a coal mine is the core area of ​​coal production, and also one of the areas with the harshest environment and the highest safety risks. Sufficient, uniform, and reliable lighting plays an irreplaceable role in ensuring the safety of workers, improving the precision of equipment operation, and preventing safety accidents.

[0003] Existing mining lighting technologies, due to their inherent limitations of being static, isolated, and passively responsive, are unable to solve the complex and temporal optical challenges posed by "instantaneous high dust levels - strong light absorption from coal walls" and "dynamic obstruction by large equipment" at the mining face. Furthermore, their operation is completely detached from the gas safety monitoring system. This means that in the most critical frontline of safe production, the lighting system itself may become a source of blind spots, safety hazards, and energy waste. Therefore, there is an urgent need for an active intelligent lighting system that can deeply integrate multi-source sensing, intelligently determine working conditions, and dynamically and accurately reconstruct the light field within an inherently safe framework, in order to fundamentally ensure visual safety and operational efficiency in the extreme dynamic environment underground.

[0004] Chinese Patent Publication No. CN119397761A discloses an adaptive intelligent explosion-proof lighting system for mines, comprising: a positioning base station, a lighting network, personnel identification cards, a 3D GIS module, an environmental monitoring module, and a central processing module. This system constructs a visibility compensation component based on empirical formulas for visibility and smoke, enabling it to compensate for changes in visibility when adjusting the luminous power, without requiring additional light or motion sensors. Furthermore, it proposes a simulated K-shortest path algorithm, which organically combines the Yen algorithm, fire simulation, particle swarm optimization, and hazard assessment to achieve dynamic and comprehensive intelligent escape route planning. Finally, the central processing module controls the luminous units along the escape route to flash sequentially from farthest to closest relative to the escape route endpoint, indicating the escape route.

[0005] Therefore, the aforementioned adaptive intelligent explosion-proof lighting system for mining has the following problems:

[0006] 1. This scheme is designed based on the static or slowly changing environment of the main roadway. The passive response mode that relies on video to infer brightness has inherent hysteresis. Moreover, the adjustment is based only on empirical formulas for brightness and smoke, which makes it completely unable to effectively cope with the instantaneous light decay caused by the combination of "dust burst at the moment of cutting" and "strong light absorption of the coal wall", as well as the dynamic occlusion shadows caused by "the movement of the huge body of the mining equipment". It has the problem of insufficient adaptability to the extreme dynamic environment of the mining face.

[0007] 2. The lighting decision-making logic of this scheme is independent of the mine gas monitoring system and completely ignores the local visual blind spots caused by the movement of large equipment. As a result, the system cannot incorporate the most fatal safety risk of gas concentration as a core constraint into the control strategy, nor can it identify and compensate for dynamic shadow areas. There is a problem of deep disconnect between the lighting system and the core safety elements of the production process. Summary of the Invention

[0008] To address this, the present invention provides an intelligent intrinsically safe LED lighting strip and lighting system for mining, which overcomes the problems in the prior art that cannot effectively cope with the instantaneous light decay caused by the combined effect of dust bursts during cutting and strong light absorption by the coal wall, as well as the dynamic shading caused by the movement of the large mining equipment.

[0009] To achieve the above objectives, the present invention provides an intelligent intrinsically safe LED lighting system for mining, comprising:

[0010] The data acquisition module is used to acquire the pose vector and vibration spectrum characteristics of the mining equipment, the transient dust mass concentration value, gas volume concentration value and light field distribution of the mining face;

[0011] The production determination module is used to extract the effective value of time-domain acceleration and the cumulative energy value of vibration from the vibration spectrum characteristics, and to determine the cutting load characteristic coefficient. Based on the cutting load characteristic coefficient, it determines whether the large mining equipment has entered the transient high dust operation period.

[0012] The light decay determination module is used to obtain the comprehensive light flux attenuation coefficient based on the transient dust mass concentration value and the coal and rock light absorption rate, so as to determine whether the current light intensity is qualified.

[0013] The lighting control module is used to determine the driving duty cycle and color temperature current ratio of the light strip based on the ratio of the comprehensive luminous flux attenuation coefficient to the preset comprehensive luminous flux attenuation coefficient.

[0014] The control and detection module is used to reacquire the light field distribution of the mining face to determine the effective illuminance achievement rate, so as to determine whether the initial control of the brightness of the light strip is qualified.

[0015] The shadow determination module is used to obtain the projection coverage of the device outline on the illumination surface and the measured illuminance attenuation coefficient of the projection area based on the pose vector and the light field distribution, and to determine the comprehensive evaluation value of shadow influence, so as to determine whether the projection coverage area is a dynamic shadow compensation area that needs to be compensated.

[0016] The shadow compensation module is used to obtain a comprehensive brightness compensation coefficient based on the gas volume concentration value and the measured illuminance attenuation coefficient, so as to determine the edge gain module around the dynamic shadow area, improve the local beam brightness and improve the overall light strip brightness of the tunnel face.

[0017] Furthermore, the production determination module responds to the vibration spectrum characteristics of the mining equipment acquired by the data acquisition module, and determines that the large mining equipment has entered a transient high-dust operation period based on the cutting load characteristic coefficient being greater than or equal to a preset cutting load characteristic coefficient.

[0018] Furthermore, in response to the large mining equipment entering a transient high-dust operation period, the light attenuation determination module determines that the current light intensity is unqualified based on the fact that the comprehensive light flux attenuation coefficient is greater than the preset comprehensive light flux attenuation coefficient.

[0019] Furthermore, in response to the current light intensity being unqualified, the lighting control module determines the driving duty cycle of the lifting light strip in the target area of ​​the mining face based on the fact that the ratio of the comprehensive luminous flux attenuation coefficient to the preset comprehensive luminous flux attenuation coefficient is less than or equal to a preset ratio.

[0020] Furthermore, the lighting control module determines to simultaneously increase the driving duty cycle of the light strip in the target area of ​​the mining face and the current ratio of the low color temperature LED chip group based on the fact that the ratio of the comprehensive luminous flux attenuation coefficient to the preset comprehensive luminous flux attenuation coefficient is greater than a preset ratio.

[0021] Furthermore, in response to the lighting control module performing control, the control detection module determines that the initial control of the light strip brightness is unqualified based on the effective illuminance achievement rate being less than the preset effective illuminance achievement rate.

[0022] Furthermore, in response to the initial adjustment failing, the shadow determination module determines the projected coverage area as the dynamic shadow compensation area that needs compensation, based on the fact that the comprehensive evaluation value of the shadow impact is greater than the preset evaluation value.

[0023] Furthermore, in response to the projection coverage area being a dynamic shadow area requiring dynamic compensation, the shadow compensation module determines and identifies the edge gain module around the dynamic shadow area based on the fact that the comprehensive brightness compensation coefficient is less than the preset comprehensive brightness compensation coefficient. The product of the driving duty cycle of the edge gain module and the comprehensive brightness compensation coefficient is used as the first target duty cycle to improve the edge driving duty cycle of the edge gain module.

[0024] Furthermore, in response to the projection coverage area being a dynamic shadow area requiring dynamic compensation, the shadow compensation module determines the product of the driving duty cycle of all LED light strips in the working area of ​​the mining face and the comprehensive brightness compensation coefficient as the second target duty cycle, based on the comprehensive brightness compensation coefficient being greater than or equal to the preset comprehensive brightness compensation coefficient, thereby improving the overall brightness.

[0025] On the other hand, the present invention also provides an intelligent intrinsically safe LED lighting strip for mining, comprising:

[0026] An insulating component, comprising a lightweight insulating sleeve disposed on the outside of the light strip for insulating purposes;

[0027] The plug assembly includes an aviation plug for connecting an intrinsically safe DC regulated power supply to the end of the light strip.

[0028] An illumination assembly comprising an array of LED beads disposed inside the lightweight insulating sleeve for illumination;

[0029] The integrated monitoring component includes an intrinsically safe illuminance sensor disposed inside the light strip to obtain the light field distribution of the mining face and an intrinsically safe photosensor to obtain the light intensity of the light emitted by the LED array after reflection by the working face environment.

[0030] An independent monitoring component includes an independent sensing unit that is independently installed outside the light strip and communicates with the light strip via an intrinsically safe digital bus to obtain the pose vector of the mining equipment, vibration spectrum characteristics, and transient dust mass concentration and gas volume concentration values ​​of the mining face.

[0031] Compared with existing technologies, the beneficial effects of this invention are as follows: Through the coordinated operation of a data acquisition module, a production judgment module, a light decay judgment module, a lighting control module, a control detection module, a shadow judgment module, and a shadow compensation module, this invention achieves intelligent, dynamic, and safe adaptation to the complex lighting environment of mine working faces; the system can provide early warnings based on the vibration characteristics of mining equipment and proactively respond to instantaneous high dust conditions, solving the problem of delayed response of traditional lighting systems to high dust conditions; by fusing transient dust mass concentration values ​​and coal and rock absorbance to obtain a comprehensive luminous flux attenuation coefficient, it determines whether the current illuminance intensity is qualified; and under unqualified conditions, it further determines whether the comprehensive luminous flux attenuation coefficient is qualified based on a preset comprehensive luminous flux attenuation coefficient. The ratio of the combined light flux attenuation coefficient determines the initial control of the light strip brightness, effectively overcoming the inability of traditional lighting systems to effectively cope with the instantaneous light decay caused by the combined effect of dust bursts during cutting and strong light absorption by the coal wall. By calculating the comprehensive evaluation value of shadow impact through projection coverage and measured illuminance attenuation coefficient, it is determined whether the projection coverage area is a dynamic shadow compensation area that needs compensation. For the shadow compensation area, a comprehensive brightness compensation coefficient is obtained based on the gas volume concentration value and the measured illuminance attenuation coefficient, determining the implementation of safety-first local beam brightness compensation and brightness-first brightening compensation. This can effectively solve the problem that traditional lighting systems cannot cope with the dynamic shading shadows caused by the movement of the large mining equipment.

[0032] Furthermore, this invention utilizes a production judgment module to analyze vibration spectrum, enabling non-contact, real-time identification of mining equipment transitioning from idling to heavy-load cutting conditions. By extracting the effective value of temporal acceleration and the cumulative energy value of vibration, and then weighted and fused to determine the cutting load characteristic coefficient, it can provide early warning before dust outbreaks, gaining crucial processing time for adjusting the light intensity of the lighting system and changing the passive response of traditional lighting in the face of sudden high dust levels. The light decay judgment module determines the comprehensive luminous flux attenuation coefficient by using dust transmittance and coal and rock absorbance, quantifying the synergistic interference effect of dust scattering and coal wall absorption on light intensity. This enables accurate measurement of the actual light loss at the mining face, avoiding deviations caused by single-factor measurements and providing a precise and reliable basis for subsequent lighting compensation.

[0033] Furthermore, this invention initiates a preliminary control strategy for the brightness of the light strip based on the ratio of the comprehensive luminous flux attenuation coefficient through the lighting control module: when the ratio is less than or equal to a preset ratio, the basic illuminance is quickly restored by precisely increasing the drive duty cycle; when the ratio is greater than the preset ratio, a coordinated control of brightness enhancement and spectral shift to a lower color temperature is implemented simultaneously, which can effectively enhance the penetration of light in dense dust, solve the problem of traditional lighting having a single method and low efficiency in dealing with different degrees of light decay, reduce dark areas, and eliminate the problem of visual fatigue caused by alternating strong and weak light in the narrow space of the mining face; furthermore, the control detection module resamples the light field and calculates the effective illuminance achievement rate to verify whether the preliminary control has met the standard, which can ensure that the effectiveness of each control action can be accurately monitored, avoiding the waste of lighting energy caused by multiple ineffective controls.

[0034] Furthermore, this invention calculates a comprehensive evaluation value of shadow impact through normalization and weighted fusion to determine whether the projected coverage area is a dynamic shadow compensation area requiring compensation, thus solving the problem of misjudgment caused by the single shadow criterion in traditional methods. It further dynamically adjusts the safety limit factor based on real-time gas concentration and calculates a comprehensive brightness compensation coefficient, which integrates the severity of shadows with the safety allowance. When safety is limited, a safety-first compensation strategy is implemented, using changes in reflected light intensity to locate the shadow boundary and precisely increasing the gain of only a small number of LED modules at the outer edge of the boundary, improving visual transition with minimal power consumption and reducing lighting resource waste. When the safety margin is sufficient, a brightness-first compensation strategy is implemented to quickly increase the basic illuminance of the entire working face. This ensures the safety of the mine environment under any gas concentration conditions, reducing the probability of mine safety accidents. Attached Figure Description

[0035] Figure 1 This is a functional module connection diagram of an intelligent intrinsically safe LED lighting system for mining, according to an embodiment of the present invention.

[0036] Figure 2 This is a logic block diagram of an embodiment of the present invention for determining a preliminary control strategy for the brightness of a light strip based on the ratio of the comprehensive luminous flux attenuation coefficient to a preset comprehensive luminous flux attenuation coefficient.

[0037] Figure 3 This is a logic block diagram illustrating the strategy for determining the brightness compensation of the LED strip based on the comprehensive brightness compensation coefficient, according to an embodiment of the present invention.

[0038] Figure 4 This is a structural schematic diagram of an intelligent intrinsically safe LED lighting strip for mining, according to an embodiment of the present invention.

[0039] In the diagram, 1 is an LED lamp array, 2 is a lightweight insulating sleeve, 3 is an aviation plug, 4 is an intrinsically safe illuminance sensor, and 5 is an intrinsically safe photosensor. Detailed Implementation

[0040] To make the objectives and advantages of the present invention clearer, the present invention will be further described below with reference to embodiments; it should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention.

[0041] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0042] It should be noted that in the description of this invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc., which indicate directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and is not intended to indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0043] Please see Figure 1 The diagram shown is a functional module connection block diagram of an intelligent intrinsically safe LED lighting system for mining according to an embodiment of the present invention.

[0044] This invention provides an intelligent intrinsically safe LED lighting system for mining, comprising:

[0045] The data acquisition module is used to acquire the pose vector of the large mining equipment and the vibration spectrum characteristics from the start of idling to the moment of cutting, the dust mass concentration value and gas volume concentration value of the tunnel, and the light field distribution of the tunnel.

[0046] The production determination module, which is connected to the data acquisition module, is used to analyze the vibration spectrum characteristics, extract the effective value of time-domain acceleration and the cumulative energy value of vibration, and calculate the cutting load characteristic coefficient based on the effective value of time-domain acceleration and the cumulative energy value of vibration, so as to determine whether the large mining equipment has entered the transient high dust operation period according to the cutting load characteristic coefficient.

[0047] The light decay determination module, which is connected to the production determination module, is used to obtain the current transient dust mass concentration value when it is determined that the large mining equipment has entered the transient high dust operation period, and calculate the comprehensive light flux attenuation coefficient based on the transient dust mass concentration value and the coal and rock light absorption rate, so as to determine whether the current light intensity is qualified according to the comprehensive light flux attenuation coefficient.

[0048] The lighting control module, which is connected to the light decay determination module, is used to determine a preliminary control strategy for the brightness of the light strip based on the ratio of the comprehensive luminous flux attenuation coefficient to the preset comprehensive luminous flux attenuation coefficient when the current light intensity is determined to be unqualified.

[0049] The control and detection module is connected to the lighting control module and the data acquisition module respectively. In response to the lighting control module performing control, it reacquires the light field distribution data of the working surface and calculates the effective illuminance achievement rate. Based on the effective illuminance achievement rate, it determines whether the preliminary control strategy for the brightness of the light strip is qualified.

[0050] The shadow determination module is connected to the data acquisition module and the control detection module respectively. It is used to obtain the projection coverage of the device outline on the lighting surface according to the pose vector when the preliminary control strategy is determined to be unqualified, and to obtain the measured illuminance attenuation coefficient of the projection area according to the light field distribution. Based on the projection coverage and the measured illuminance attenuation coefficient, the shadow impact comprehensive evaluation value is calculated, so as to determine whether the projection coverage area is a dynamic shadow compensation area that needs to be compensated according to the shadow impact comprehensive evaluation value.

[0051] The shadow compensation module, which is connected to the shadow determination module, is used to obtain a comprehensive brightness compensation coefficient based on the gas volume concentration value and the measured illuminance attenuation coefficient when the projected coverage area is determined to be a dynamic shadow area that requires dynamic compensation. Based on the comprehensive brightness compensation coefficient, it determines to perform safety-first local beam brightness compensation and brightness-first brightening compensation.

[0052] Specifically, this invention achieves intelligent, dynamic, and safe adaptation to the complex lighting environment of mine working faces through the coordinated operation of a data acquisition module, a production judgment module, a light decay judgment module, a lighting control module, a control detection module, a shadow judgment module, and a shadow compensation module. The system can provide early warnings based on the vibration characteristics of mining equipment and proactively respond to instantaneous high-dust conditions, solving the problem of delayed response in traditional lighting systems to high-dust conditions. By fusing transient dust mass concentration values ​​and coal and rock absorbance to obtain a comprehensive luminous flux attenuation coefficient, it determines whether the current illuminance intensity is qualified. If unqualified, it further determines whether the comprehensive luminous flux attenuation coefficient is acceptable based on a preset comprehensive luminous flux attenuation coefficient. The ratio determines the initial control of the light strip brightness, effectively overcoming the inability of traditional lighting systems to effectively cope with the instantaneous light decay caused by the combined effect of dust bursts during cutting and strong light absorption by the coal wall; by calculating the comprehensive evaluation value of shadow impact through projection coverage and measured illuminance attenuation coefficient, it is determined whether the projection coverage area is a dynamic shadow compensation area that needs compensation. For the shadow compensation area, a comprehensive brightness compensation coefficient is obtained based on the gas volume concentration value and the measured illuminance attenuation coefficient, and it is determined to perform safety-first local beam brightness compensation and brightness-first brightening compensation, which can effectively solve the problem that traditional lighting systems cannot cope with the dynamic shading shadows caused by the movement of the large body of mining equipment.

[0053] Specifically, the production determination module responds to the vibration spectrum characteristics acquired by the data acquisition module, analyzes and extracts the effective value of time-domain acceleration and the cumulative vibration energy value, and calculates the cutting load characteristic coefficient based on the effective value of time-domain acceleration and the cumulative vibration energy value. The module then determines whether the large mining equipment has entered a transient high-dust operation period based on the comparison result between the cutting load characteristic coefficient and a preset cutting load characteristic coefficient.

[0054] If the cutting load characteristic coefficient is less than the preset cutting load characteristic coefficient, it is determined that the large mining equipment has not entered the transient high dust operation period;

[0055] If the cutting load characteristic coefficient is greater than or equal to the preset cutting load characteristic coefficient, then it is determined that the large mining equipment has entered the transient high dust operation period.

[0056] In this embodiment of the invention, the specific method for obtaining the cutting load characteristic coefficient is as follows: First, the collected original vibration signal is preprocessed to filter out high-frequency noise and abnormal interference, and amplitude standardization is performed; then, within a fixed analysis period, the arithmetic mean of the squares of all vibration acceleration data points within the fixed analysis period is calculated, and then the square root of the arithmetic mean is performed to obtain the effective value of the time-domain acceleration of the vibration signal. The effective value of the time-domain acceleration reflects the average intensity of the vibration within the fixed analysis period; simultaneously, frequency component analysis is performed on the same vibration signal segment to decompose it into vibration energy corresponding to different frequencies; according to the mining equipment... The theoretical fundamental frequency of the cutting head is calculated by dividing the rated rotational speed of the cutting head by 60. A specific frequency range covering its key harmonic components is determined. For example, a specific frequency range from 0.8 times the fundamental frequency to 3 times the fundamental frequency is set around the theoretical fundamental frequency. The sum of the vibration energy within the specific frequency range is calculated to obtain the cumulative vibration energy value, which serves as a frequency domain index reflecting the intensity of the cutting action. Finally, the effective value of the time-domain acceleration and the cumulative vibration energy value within the specific frequency range are normalized and weighted summed to obtain the cutting load characteristic coefficient.

[0057] The fixed analysis period is 0.5s to 2s, preferably 1.5s.

[0058] The specific calculation method for the effective value of the time-domain acceleration is as follows: First, obtain the discrete vibration acceleration digital signal sequence within the analysis time window; then, calculate the square value of each data point in the signal sequence; next, calculate the arithmetic mean of all square values; finally, perform a square root operation on the arithmetic mean to obtain the effective value of the time-domain acceleration.

[0059] The weighting coefficient of the effective value of the time-domain acceleration ranges from 0.3 to 0.5, preferably 0.4, and the weighting coefficient of the cumulative vibration energy value ranges from 0.5 to 0.7, preferably 0.6.

[0060] In this embodiment of the invention, the preset severance load characteristic coefficient ranges from 0.8 to 1.2, preferably 1.0. The preferred range and preferred value can be determined according to the actual situation, and are not specifically limited here.

[0061] Specifically, the light decay determination module, in response to the production determination module determining that the large mining equipment has entered a transient high-dust operation period, obtains the current transient dust mass concentration value, and calculates a comprehensive luminous flux attenuation coefficient based on the transient dust mass concentration value and the coal and rock absorbance. The module then determines whether the current illuminance is qualified based on a comparison between the comprehensive luminous flux attenuation coefficient and a preset comprehensive luminous flux attenuation coefficient.

[0062] If the overall luminous flux attenuation coefficient is less than or equal to the preset overall luminous flux attenuation coefficient, then the current illuminance is determined to be qualified.

[0063] If the overall luminous flux attenuation coefficient is greater than the preset overall luminous flux attenuation coefficient, then the current illuminance is determined to be unqualified.

[0064] In this invention, the transient dust mass concentration value is directly obtained through an intrinsically safe dust concentration sensor built into the light strip.

[0065] In this embodiment of the invention, the coal and rock absorbance is obtained by querying a preset coal and rock type-absorbance mapping database; the database is pre-established by measuring the absorption spectrum data of different coal and rock samples to different wavelengths of light in the laboratory and taking the average value within the illumination spectrum range of the working face; the coal and rock type can be manually input by the operator based on the geological data of the working face, or automatically identified by the system by analyzing the video images of the working face.

[0066] The light absorption rate of the coal varies within a wide range depending on the type of coal. For common coals such as bituminous coal and anthracite in mines, the light absorption rate is usually between 0.85 and 0.95, that is, the reflectance is between 0.15 and 0.05. For typical bright coals, the light absorption rate is preferably 0.90, that is, the reflectance is 0.10.

[0067] In this embodiment of the invention, the calculation process of the comprehensive luminous flux attenuation coefficient is as follows: First, based on the transient dust mass concentration value, and according to the physical law that light intensity decreases exponentially with propagation distance in a uniform dust medium, an extinction coefficient characterizing the optical properties of specific mine dust and a typical optical path of working face illumination are introduced. By calculating the product of the transient dust mass concentration value, the extinction coefficient, and the typical optical path, and then taking its negative exponential function value, the transmittance caused by dust is obtained. At the same time, based on the light absorption of coal and rock, the value 1 is subtracted from the light absorption of coal and rock to obtain the reflectance of the coal and rock wall surface. Finally, the calculated dust transmittance and the coal and rock reflectance are multiplied to obtain the comprehensive luminous flux attenuation coefficient.

[0068] The extinction coefficient is a physical constant related to the average particle size, composition and refractive index of the dust particles in the well. Its typical value can be obtained in advance by laboratory calibration or by consulting relevant optical manuals. The present invention preferably has a value of 0.5 m² / g.

[0069] The typical optical path can be determined based on the average distance between the light strip and the coal face at the working face, and in this embodiment of the invention, the value is 3m.

[0070] In this embodiment of the invention, the preset comprehensive luminous flux attenuation coefficient ranges from 0.4 to 0.6, preferably 0.5. The preferred range and preferred value can be determined according to the actual situation, and are not specifically limited here.

[0071] Specifically, this invention utilizes a production judgment module to analyze vibration spectrum, enabling non-contact, real-time identification of mining equipment transitioning from idle to heavy-load cutting conditions. By extracting the effective value of temporal acceleration and the cumulative energy value of vibration, and then weighted and fused to determine the cutting load characteristic coefficient, it can provide early warning before dust outbreaks, gaining crucial processing time for adjusting the light intensity of the lighting system and changing the passive response of traditional lighting in the face of sudden high dust levels. The light decay judgment module determines the comprehensive luminous flux attenuation coefficient by using dust transmittance and coal and rock absorbance, quantifying the synergistic interference effect of dust scattering and coal wall absorption on light intensity. This enables accurate measurement of the actual light loss at the mining face, avoiding deviations caused by single-factor measurements and providing a precise and reliable basis for subsequent lighting compensation.

[0072] Please see Figure 2 As shown, it is a logic block diagram of an embodiment of the present invention for determining the initial control strategy of the brightness of the light strip based on the ratio of the comprehensive luminous flux attenuation coefficient to the preset comprehensive luminous flux attenuation coefficient.

[0073] Specifically, in response to the light decay determination module determining that the current light intensity is unqualified, the lighting control module determines a preliminary control strategy for the brightness of the light strip based on a comparison between the ratio of the comprehensive luminous flux attenuation coefficient to a preset comprehensive luminous flux attenuation coefficient and a preset ratio.

[0074] If the ratio is less than or equal to the preset ratio, then the first control strategy is determined to be applied to the brightness of the light strip.

[0075] If the ratio is greater than the preset ratio, then the second control strategy for the brightness of the light strip is determined to be executed.

[0076] In this embodiment of the invention, the ratio is the ratio of the overall optical flux attenuation coefficient to the preset overall optical flux attenuation coefficient.

[0077] In this embodiment of the invention, the preset ratio ranges from 0.9 to 1.1, preferably 1.0. The preferred value and the preferred range can be determined according to the actual situation, and are not specifically limited here.

[0078] In this embodiment of the invention, the first control strategy is to increase the driving duty cycle of the light strip in the target area of ​​the mining face, and use the ratio as the duty cycle control coefficient. That is, the driving duty cycle is increased to the product of the reference driving duty cycle and the duty cycle control coefficient. The brightness of the light strip is increased by adjusting the duty cycle of the pulse width modulation driving signal of the light strip.

[0079] The reference drive duty cycle is a fixed drive duty cycle value that is pre-calibrated and set for the light strip to ensure that the illuminance of the working face reaches the minimum illuminance standard stipulated in the "Coal Mine Safety Regulations". The value range is 50% to 80%, preferably 60%.

[0080] In this embodiment of the invention, the second control strategy is to simultaneously increase the driving duty cycle of the light strip in the target area of ​​the mining face and the current ratio of the low color temperature LED chip group, that is, to increase the driving duty cycle to the product of the reference driving duty cycle and the duty cycle control coefficient, and control the current ratio of the high color temperature and low color temperature LED chip groups in the light strip, so that the current ratio of the low color temperature LED chip group is increased by 10% to 30%, preferably by 20%.

[0081] Specifically, in response to the lighting control module executing control, the control detection module reacquires the light field distribution data of the target area of ​​the mining face, calculates the effective illuminance achievement rate, and determines whether the initial control strategy for the light strip is qualified based on the comparison result between the effective illuminance achievement rate and the preset effective illuminance achievement rate.

[0082] If the effective illuminance achievement rate is less than the preset effective illuminance achievement rate, then the initial control strategy for the brightness of the light strip is determined to be unqualified.

[0083] If the effective illuminance achievement rate is greater than or equal to the preset effective illuminance achievement rate, then the preliminary control strategy for the brightness of the light strip is deemed qualified.

[0084] In this embodiment of the invention, the specific calculation process of the effective illuminance achievement rate is as follows: First, extract the actual illuminance measurement values ​​of multiple sampling points in the target area from the light field distribution data; then, calculate the average value of the actual illuminance measurement values ​​of all sampling points as the actual average illuminance value after adjustment of the target area; finally, calculate the ratio of the actual average illuminance value to the target illuminance value to obtain the effective illuminance achievement rate.

[0085] The target illuminance value is the minimum illuminance requirement set according to the provisions of the Coal Mine Safety Regulations for artificial lighting in mining faces, and its typical range is 20 lux to 50 lux.

[0086] In this embodiment of the invention, the preset effective illuminance achievement rate ranges from 85% to 95%, preferably 90%. The preferred range and preferred value can be determined according to the actual situation, and are not specifically limited here.

[0087] Specifically, this invention initiates a preliminary control strategy for the brightness of the light strip based on the ratio of the comprehensive luminous flux attenuation coefficient through a lighting control module. When the ratio is less than or equal to a preset ratio, the basic illuminance is quickly restored by precisely increasing the drive duty cycle. When the ratio is greater than the preset ratio, a coordinated control of brightness enhancement and spectral shift to a lower color temperature is implemented simultaneously. This effectively enhances the penetration of light in dense dust, solving the problem of traditional lighting's single approach and low efficiency in dealing with different degrees of light decay. It can reduce dark areas and eliminate visual fatigue caused by alternating strong and weak light in the narrow space of the mining face. Furthermore, the control detection module resamples the light field and calculates the effective illuminance achievement rate to verify whether the preliminary control has met the standards. This ensures that the effectiveness of each control action can be accurately monitored, avoiding the waste of lighting energy caused by multiple ineffective controls.

[0088] Specifically, in response to the control and detection module determining that the initial control strategy for the light strip brightness is unqualified, the shadow determination module calculates the projection coverage of the device contour on the illumination surface based on the pose vector, and obtains the measured illuminance attenuation coefficient of the projection area based on the light field distribution data. Based on the projection coverage and the measured illuminance attenuation coefficient, a comprehensive shadow impact evaluation value is calculated. The module then determines whether the projection coverage area is a dynamic shadow compensation area requiring compensation based on the comparison between the comprehensive shadow impact evaluation value and a preset evaluation value.

[0089] If the comprehensive evaluation value of the shadow effect is less than or equal to the preset evaluation value, then it is determined that the projection coverage area does not need compensation.

[0090] If the comprehensive evaluation value of the shadow effect is greater than the preset evaluation value, then the projected coverage area is determined as the dynamic shadow compensation area that needs to be compensated.

[0091] In this embodiment of the invention, the specific calculation process of the projection coverage rate is as follows: First, based on the three-dimensional coordinates of the equipment outline in the pose vector and the posture of the mining equipment body, a two-dimensional projection graphic of the equipment on the working face lighting surface is obtained through geometric projection calculation; then, the ratio of the area of ​​the projection graphic to the total area of ​​the target area is calculated to obtain the projection coverage rate.

[0092] In this embodiment of the invention, the specific calculation process of the measured illuminance attenuation coefficient is as follows: from the light field distribution data, the average illuminance of the projection area of ​​each sampling point within the coverage area of ​​the projection pattern, and the average illuminance of the background area of ​​the adjacent background area outside the projection pattern are extracted respectively; the measured illuminance attenuation coefficient is 1 minus the ratio of the average illuminance of the projection area to the average illuminance of the background area; the larger the measured illuminance attenuation coefficient, the more severe the illuminance attenuation caused by device obstruction.

[0093] In this embodiment of the invention, the specific calculation process of the comprehensive evaluation value of shadow impact is as follows: First, the projection coverage and the measured illuminance attenuation coefficient are normalized to the range of 0 to 1. The normalization adopts the maximum-minimum value normalization method, that is, the two parameters are divided by their maximum values ​​that may occur in typical working scenarios. Then, the weighted sum of the normalized projection coverage and the measured illuminance attenuation coefficient is calculated to obtain the comprehensive evaluation value of shadow impact.

[0094] The weighting coefficient of the projection coverage rate ranges from 0.3 to 0.5, preferably 0.4, and the weighting coefficient of the measured illuminance attenuation coefficient ranges from 0.5 to 0.7, preferably 0.6.

[0095] In this embodiment of the invention, the preset evaluation value ranges from 0.6 to 0.8, preferably 0.7. The preferred range and preferred value can be determined according to the actual situation, and are not specifically limited here.

[0096] Please see Figure 3 As shown, it is a logic block diagram of the compensation strategy for the brightness of the light strip determined according to the comprehensive brightness compensation coefficient in an embodiment of the present invention.

[0097] Specifically, in response to the shadow determination module determining that the projected coverage area is a dynamic shadow compensation area requiring compensation, the shadow compensation module calculates a comprehensive brightness compensation coefficient based on the current environmental gas volume concentration value and the measured illuminance attenuation coefficient of the projected coverage area. Then, based on a comparison between the comprehensive brightness compensation coefficient and a preset comprehensive brightness compensation coefficient, a compensation strategy for the light strip brightness is determined.

[0098] If the overall brightness compensation coefficient is less than the preset overall brightness compensation coefficient, then the first compensation strategy prioritizing safety is determined to be implemented.

[0099] If the overall brightness compensation coefficient is greater than or equal to the preset overall brightness compensation coefficient, then the second compensation strategy prioritizing brightness is determined to be implemented.

[0100] In this embodiment of the invention, the specific calculation process of the comprehensive brightness compensation coefficient is as follows: First, the measured illuminance attenuation coefficient is used as the basic compensation requirement value. Then, a safety limit factor is determined based on the comparison between the current environmental gas volume concentration value and the first and second concentration thresholds. When the gas volume concentration value is lower than the first concentration threshold, the safety limit factor is 1, indicating a safe condition that allows full brightness compensation. When the gas volume concentration value is between the first and second concentration thresholds, the safety limit factor linearly decreases from 1 to 0.5. The specific value is determined by linear interpolation, that is, based on the specific position of the current gas volume concentration value within the numerical range formed by the first and second concentration thresholds, the value is linearly taken between 1 and 0.5 according to the proportion of that position. When the gas volume concentration value reaches or exceeds the second concentration threshold, the safety limit factor is 0.5, indicating that no matter how dark the shadow is, its maximum compensation intensity is limited to half of the basic requirement to ensure absolute safety. Finally, the comprehensive brightness compensation coefficient is obtained by multiplying the basic compensation requirement value and the safety limit factor.

[0101] In this embodiment of the invention, the gas volume concentration value is directly measured and obtained by the intrinsically safe gas concentration sensor built into the light strip; the first concentration threshold is the warning concentration set according to the "Coal Mine Safety Regulations", and the value range is usually 0.8% to 1%; the second concentration threshold is the safety action concentration, and the value range is usually 1% to 1.5%.

[0102] In this embodiment of the invention, the preset comprehensive brightness compensation coefficient ranges from 1.2 to 1.8, preferably 1.5. The preferred range and preferred value can be determined according to the actual situation, and are not specifically limited here.

[0103] In this embodiment of the invention, the first compensation strategy is a safety-first local beam brightness compensation strategy, that is, under the premise of strictly maintaining the current total power consumption unchanged or allowing only a very small increase, the edge gain modules around the dynamic shadow area are identified, and the brightness of the edge LEDs in the shadow area is enhanced by increasing the edge drive duty cycle of the edge gain modules around the dynamic shadow area.

[0104] Specifically, the identification method of the edge gain module is as follows: First, a low-power intrinsically safe photosensitive sensor is integrated next to each LED module of the light strip or every few modules to monitor the light intensity of the light emitted by the module after reflection from the working surface environment; when the shadow determination module determines the dynamic shadow compensation area, the system analyzes the reflected light intensity data of all modules in and around the area; LED modules with significant jumps in reflected light intensity are defined as shading boundaries, for example, LED modules whose light intensity value drops to less than 50% of the average value of adjacent normal areas; 1 to 3 LED modules located outside the shading boundary and whose reflected light intensity is higher than the average value of adjacent normal areas are defined as edge gain modules that need to perform gain.

[0105] The gain execution method is as follows: the edge gain module performs gain based on the comprehensive brightness compensation coefficient, and the controller uses the product of the driving duty cycle of the edge gain module and the comprehensive brightness compensation coefficient as the first target duty cycle to increase the edge driving duty cycle of the edge gain module and achieve brightness enhancement.

[0106] In this embodiment of the invention, the second compensation strategy is a brightness-priority brightening compensation strategy, that is, to increase the brightness of all LED light strips in the current mining face working area. According to the comprehensive brightness compensation coefficient, the product of the driving duty cycle of all LED light strips and the comprehensive brightness compensation coefficient is directly used as the second target duty cycle to improve the brightness of the entire light strip and achieve brightness compensation for the shadow area.

[0107] Specifically, this invention calculates a comprehensive evaluation value of shadow impact through normalization and weighted fusion to determine whether the projected coverage area is a dynamic shadow compensation area requiring compensation, thus solving the problem of misjudgment caused by the single shadow criterion in traditional methods. Furthermore, it dynamically adjusts the safety limit factor based on real-time gas concentration and calculates a comprehensive brightness compensation coefficient, which integrates the severity of shadows with the safety allowance. When safety is limited, a safety-first compensation strategy is implemented, using changes in reflected light intensity to locate the shadow boundary and precisely increasing the gain of only a small number of LED modules at the outer edge of the boundary, improving visual transition with minimal power consumption and reducing lighting resource waste. When the safety margin is sufficient, a brightness-first compensation strategy is implemented to quickly increase the basic illuminance of the entire working face. This ensures the safety of the mine environment under any gas concentration conditions, reducing the probability of mine safety accidents.

[0108] Please see Figure 4 As shown, it is a structural schematic diagram of the intelligent intrinsically safe LED lighting strip for mining according to an embodiment of the present invention.

[0109] Specifically, embodiments of the present invention also provide an intelligent intrinsically safe LED lighting strip for mining, comprising,

[0110] An insulating component, comprising a lightweight insulating sleeve 2 disposed on the outside of the light strip for insulating purposes.

[0111] The plug assembly includes an aviation plug 3 for connecting an intrinsically safe DC regulated power supply at the end of the light strip.

[0112] The lighting assembly includes an array of LED beads 1 disposed inside the lightweight insulating sleeve 2 for illumination.

[0113] The integrated monitoring component includes an intrinsically safe illuminance sensor 4 disposed inside the light strip to obtain the light field distribution of the mining face, and an intrinsically safe photosensor 5 to obtain the light intensity of the light emitted by the LED array 1 after reflection by the working face environment.

[0114] An independent monitoring component includes an independent sensing unit that is independently installed outside the light strip and communicates with the light strip via an intrinsically safe digital bus to obtain the pose vector of the mining equipment, vibration spectrum characteristics, and transient dust mass concentration and gas volume concentration values ​​of the mining face.

[0115] In this embodiment of the invention, the independent sensing unit and the light strip communicate via an intrinsically safe digital bus, such as a CAN bus, to jointly constitute a complete lighting light strip, including:

[0116] Equipment pose sensing module: includes an intrinsically safe lidar (not shown in the figure) fixed to the tunnel wall, used to acquire the pose of the mining equipment.

[0117] Equipment operating condition sensing module: includes an intrinsically safe vibration acceleration sensor (not shown in the figure) directly installed on the body of the mining equipment, used to acquire the vibration spectrum characteristics of the mining equipment from idling start to the moment of cutting.

[0118] Environmental safety sensing module: includes intrinsically safe gas concentration sensor (not shown in the figure) and dust concentration sensor (not shown in the figure) that are strictly deployed in accordance with the requirements of the "Coal Mine Safety Regulations" at the mining face and return airflow.

[0119] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A smart, intrinsically safe LED lighting system for mining, characterized in that, include, The data acquisition module is used to acquire the pose vector and vibration spectrum characteristics of the mining equipment, the transient dust mass concentration value, gas volume concentration value and light field distribution of the mining face; The production determination module is used to extract the effective value of time-domain acceleration and the cumulative energy value of vibration from the vibration spectrum characteristics, and to determine the cutting load characteristic coefficient. Based on the cutting load characteristic coefficient, it determines whether the large mining equipment has entered the transient high dust operation period. Specifically, the cutting load characteristic coefficient is based on the preprocessing of the acquired original vibration signal. The arithmetic mean of the squares of all vibration acceleration data points within a fixed analysis period is calculated, and then the square root of the arithmetic mean is performed to obtain the effective value of the time-domain acceleration of the vibration signal. The fixed analysis period is 0.5s to 2s. The same vibration signal is decomposed into vibration energy corresponding to different frequencies. The theoretical rotational fundamental frequency is calculated based on the rated rotational speed of the cutting head of the mining equipment, and a frequency range covering its key harmonic components is determined. The frequency range is 0.8 times the fundamental frequency to 3 times the fundamental frequency. The sum of the vibration energy within the frequency range is calculated to obtain the cumulative vibration energy value. The calculated effective value of the time-domain acceleration is weighted and summed with the cumulative vibration energy value within the frequency range to determine the value. The light decay determination module is used to obtain the comprehensive light flux attenuation coefficient based on the transient dust mass concentration value and the coal and rock light absorption rate, so as to determine whether the current light intensity is qualified. The lighting control module is used to determine the driving duty cycle and color temperature current ratio of the light strip based on the ratio of the comprehensive luminous flux attenuation coefficient to the preset comprehensive luminous flux attenuation coefficient. The control and detection module is used to reacquire the light field distribution of the mining face to determine the effective illuminance achievement rate, so as to determine whether the initial control of the brightness of the light strip is qualified. The shadow determination module is used to obtain the projection coverage of the device outline on the illumination surface and the measured illuminance attenuation coefficient of the projection area based on the pose vector and the light field distribution, and to determine the comprehensive evaluation value of shadow influence, so as to determine whether the projection coverage area is a dynamic shadow compensation area that needs to be compensated. The shadow compensation module is used to obtain a comprehensive brightness compensation coefficient based on the gas volume concentration value and the measured illuminance attenuation coefficient, so as to determine the edge gain module around the dynamic shadow area, improve the local beam brightness or improve the overall light strip brightness of the tunnel face. Specifically, the comprehensive brightness compensation coefficient is determined based on the product of the measured illuminance attenuation coefficient and the safety limit factor. The safety limit factor is determined based on the comparison between the current ambient gas volume concentration value and the first concentration threshold and the second concentration threshold. The larger the safety limit factor, the safer the safety condition. The shadow compensation module responds to the projection coverage area being a dynamic shadow area requiring dynamic compensation. Based on the fact that the comprehensive brightness compensation coefficient is less than the preset comprehensive brightness compensation coefficient, the edge gain module around the dynamic shadow area is identified. The product of the driving duty cycle of the edge gain module and the comprehensive brightness compensation coefficient is used as the first target duty cycle to improve the edge driving duty cycle of the edge gain module, thereby improving the local beam brightness. Based on the fact that the comprehensive brightness compensation coefficient is greater than or equal to the preset comprehensive brightness compensation coefficient, the product of the driving duty cycle of all LED light strips in the working area of ​​the mining face and the comprehensive brightness compensation coefficient is determined as the second target duty cycle to improve the overall brightness.

2. The intelligent intrinsically safe LED lighting system for mining as described in claim 1, characterized in that, The production determination module responds to the vibration spectrum characteristics of the mining equipment acquired by the data acquisition module, and determines that the large mining equipment has entered a transient high-dust operation period based on the cutting load characteristic coefficient being greater than or equal to the preset cutting load characteristic coefficient.

3. The intelligent intrinsically safe LED lighting system for mining according to claim 1, characterized in that, The light attenuation determination module responds to the large mining equipment entering a transient high-dust operation period by determining that the current light intensity is unqualified based on the fact that the comprehensive light flux attenuation coefficient is greater than the preset comprehensive light flux attenuation coefficient.

4. The intelligent intrinsically safe LED lighting system for mining according to claim 3, characterized in that, The lighting control module responds to the current light intensity being unqualified by determining the driving duty cycle of the lifting light strip in the target area of ​​the mining face based on the ratio of the comprehensive luminous flux attenuation coefficient to the preset comprehensive luminous flux attenuation coefficient being less than or equal to a preset ratio.

5. The intelligent intrinsically safe LED lighting system for mining according to claim 4, characterized in that, The lighting control module determines to simultaneously increase the driving duty cycle of the light strip in the target area of ​​the mining face and the current ratio of the low color temperature LED chip group based on the fact that the ratio of the comprehensive luminous flux attenuation coefficient to the preset comprehensive luminous flux attenuation coefficient is greater than the preset ratio.

6. The intelligent intrinsically safe LED lighting system for mining according to claim 1, characterized in that, The control and detection module responds to the lighting control module's control after it performs control, and determines that the initial control of the light strip brightness is unqualified based on the fact that the effective illuminance achievement rate is less than the preset effective illuminance achievement rate.

7. The intelligent intrinsically safe LED lighting system for mining according to claim 1, characterized in that, The shadow determination module responds to the initial adjustment failure by determining that the shadow impact comprehensive evaluation value is greater than the preset evaluation value, and determines the projection coverage area as the dynamic shadow compensation area that needs to be compensated.

8. A lighting strip suitable for the intelligent mining intrinsically safe LED lighting system according to any one of claims 1-7, characterized in that, include: An insulating component, comprising a lightweight insulating sleeve disposed on the outside of the light strip for insulating purposes; The plug assembly includes an aviation plug for connecting an intrinsically safe DC regulated power supply to the end of the light strip. An illumination assembly comprising an array of LED beads disposed inside the lightweight insulating sleeve for illumination; The integrated monitoring component includes an intrinsically safe illuminance sensor disposed inside the light strip to obtain the light field distribution of the mining face and an intrinsically safe photosensor to obtain the light intensity of the light emitted by the LED array after reflection by the working face environment. An independent monitoring component includes an independent sensing unit that is independently installed outside the light strip and communicates with the light strip via an intrinsically safe digital bus to obtain the pose vector of the mining equipment, vibration spectrum characteristics, and transient dust mass concentration and gas volume concentration values ​​of the mining face.

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