Projection lamp and method for underground coal mine

Abstract

The invention relates to a projection lamp and method for an underground coal mine, and belongs to the technical field of intelligent illumination and information projection for the underground coal mine. The technical problems that traditional underground lighting equipment can only provide environment floodlight and cannot dynamically project graphical information, and a universal projector is poor in adaptability, low in safety and prone to causing image blurring in the underground high-dust, humid and vibration environment are solved. According to the technical scheme, the projection lamp is provided, the projection lamp is provided with an anti-explosion shell, an optical projection module, an image generation and control module, an environment sensing module and a power supply and communication module, image parameters are dynamically optimized through environment sensing data, and clear projection is achieved. The technical effects are that the underground information transmission mode is innovated, the environmental adaptability and intrinsic safety are improved, the intelligent integration capability is enhanced, and the long-term operation and maintenance cost is reduced.

Description

Technical Field

[0001] This invention belongs to the field of intelligent lighting and information projection technology in underground coal mines, and relates to projection lamps and methods used in underground coal mines. Background Technology

[0002] The underground working environment in coal mines is unique, making safe production the top priority. Basic lighting is a key condition for ensuring safety in underground operations. Traditional underground lighting equipment in coal mines mainly provides ambient floodlighting, such as explosion-proof LED roadway lights and intrinsically safe miners' headlamps. These devices focus on increasing the brightness of the area, but their function is limited; they can only illuminate and do not have the ability to project information patterns.

[0003] However, with the advancement of intelligent coal mine construction, the demand for real-time and accurate information acquisition and transmission in underground operations is increasing, such as equipment operation instructions, hazardous area markings, evacuation route guidance, and real-time parameter displays. Traditional information transmission methods heavily rely on fixed signs, verbal communication, or paper documents carried by workers. In the dark, damp, and dusty environment underground, these traditional methods have the following significant shortcomings: 1. Poor visibility and inconvenient updates: Physical signs are easily soiled and worn in dusty and humid environments, and information updates are inflexible and untimely.

[0004] 2. Inaccurate information delivery: It cannot meet the needs of intelligent mines for displaying dynamic and variable graphical information.

[0005] In recent years, although some sectors have begun to explore the use of projection technology for industrial assistance, specialized projection lighting devices for the extreme environments of underground coal mines are still lacking. Currently, general-purpose industrial projectors or laser pointers are being used to project simple lines or patterns. However, these general-purpose devices have serious problems and are unsuitable for the harsh working conditions in underground coal mines: Poor environmental adaptability: The structure of general-purpose equipment is neither explosion-proof nor dustproof. In environments with high concentrations of coal dust, the light path will be severely scattered and blocked, resulting in a sharp decrease in the contrast of the projected image or even complete invisibility, and blurry imaging.

[0006] High safety risks: Projection equipment that is not designed to be explosion-proof poses a safety risk of causing an explosion when used in underground gas environments such as methane, which does not comply with coal mine safety regulations.

[0007] Insufficient intelligence: It lacks the ability to link with underground monitoring systems, positioning systems, etc., and cannot realize dynamic information projection based on location or work tasks.

[0008] Therefore, existing underground lighting equipment has limited functionality, while general-purpose projection equipment suffers from poor environmental adaptability and high safety risks. This invention aims to address the technical problems of existing underground lighting equipment's inability to dynamically project graphic information, and the poor adaptability, low safety, and image blurring issues of general-purpose projectors in high-dust, humid, and vibrating underground environments. The invention provides a projection lamp and method for use in coal mines. Summary of the Invention

[0009] In view of the limitations of existing underground lighting equipment, such as its limited functionality, inability to dynamically project graphic information, and the poor adaptability and low safety of general-purpose projectors in the high-dust, humid, and vibrating environments of underground mines, the present invention aims to provide a projection lamp and method for use in coal mines, with the following objectives: 1. Achieve information visualization projection: Project key operational information (such as equipment operation procedures, safety warnings, and evacuation route arrows) directly onto the work surface, tunnel walls, or equipment in a clear graphic or text format.

[0010] 2. Ensure inherent safety and high environmental adaptability: The entire device meets the requirements of coal mine explosion prevention, high dust prevention, moisture prevention and impact and vibration resistance, and can work stably underground for a long time.

[0011] 5. Improved projection clarity and anti-interference capability: Through special optical design, light source selection and image processing algorithms, the scattering and absorption of light path by underground dust are overcome, ensuring that the projected image remains clear and discernible even in harsh environments.

[0012] 4. Achieve intelligent linkage and control: It can receive instructions from ground or underground monitoring systems, dynamically change the projected content, and link with systems such as personnel positioning and equipment status to achieve intelligent information projection on demand and at any location.

[0013] To achieve the above objectives, the present invention provides the following technical solution: A projection light for use in underground coal mines includes an explosion-proof housing for intrinsic safety, an optical projection module for image projection, an image generation and control module for running algorithms and control, an environmental sensing module for real-time environmental monitoring, and a power supply and communication module for power supply and data transmission; wherein: The explosion-proof enclosure consists of an explosion-proof cavity and an intrinsically safe cavity; the explosion-proof cavity is made of high-strength alloy steel and houses the heat-generating part of the optical projection module; the intrinsically safe cavity is made of engineering plastic and houses the circuit parts of the image generation and control module, the environmental sensing module, and the power supply and communication module; the explosion-proof cavity and the intrinsically safe cavity are connected by an explosion-proof mating surface and through-wall optical fiber or electrical connector to achieve energy isolation. The environmental sensing module includes a dust concentration sensor for detecting real-time environmental data and has an external interface for receiving gas concentration data or personnel location information. The image generation and control module includes an embedded processor and an image memory, which are used to dynamically adjust the contrast, brightness and sharpening parameters of the image projected by the optical projection module based on the real-time dust concentration data obtained by the environmental perception module. The optical projection module includes, in sequence along the optical path, a high-brightness monochromatic or laser light source, a digital micromirror device (DMD) or a liquid crystal light valve, and a projection lens assembly. The projection lens assembly adopts a large depth-of-field fixed focal length design and has a dust-repellent coating, and the front end is equipped with a dustproof protective lens cover that can be pneumatically or electrically extended.

[0014] Furthermore, the high-brightness monochromatic or laser light source is a white light source formed by blue laser excitation of a fluorescent ceramic sheet or a monochromatic laser of a specific wavelength.

[0015] Furthermore, the power and communication module provides intrinsically safe power conversion and integrates industrial Ethernet and CAN bus interfaces for remote power supply and communication.

[0016] Furthermore, the power supply and communication module also integrates an intrinsically safe wireless module for near-field communication with mobile devices.

[0017] Furthermore, the light source of the optical projection module is a monochromatic laser of a specific wavelength, and the image generation and control module automatically selects a high-contrast monochromatic outline mode when the dust concentration is higher than a threshold.

[0018] A projection method for underground coal mines, the method comprising the following steps: Step 1: Receive commands and projected content from the control center via the power and communication module; Step 2: Obtain real-time dust concentration data of the work area through the environmental sensing module; Step 3: The image generation and control module dynamically adjusts the contrast, brightness, and sharpening parameters of the image to be projected based on the real-time dust concentration data. Step 4: Project the optimized image onto the target area using an optical projection module; Step 5: By linking the environmental sensing module with the external monitoring system, when dangerous signals such as excessive gas concentration or roof pressure are detected, the projected content is switched to safety warning information.

[0019] Furthermore, the parameters for dynamically adjusting the image include automatically selecting a high-contrast monochrome outline mode when the dust concentration is higher than a threshold.

[0020] Furthermore, the method also includes automatically closing the dustproof protective lens cover when in standby mode or when abnormal vibration is detected, via an image generation and control module; The method also includes using an environmental sensing module to cut off or reduce the light source power of the optical projection module when a gas over-limit signal is received.

[0021] Furthermore, the method also includes uploading the operation log to the control center via the power and communication module, wherein the operation log includes the switching time points of key steps, environmental data, and early warning trigger records.

[0022] The beneficial effects of this invention are as follows: (1) Upgrading static and passive physical signs to dynamic and active graphic projections greatly improves the accuracy and intuitiveness of information transmission and effectively reduces the risk of misoperation.

[0023] (2) Through the explosion-proof, dustproof and vibration-resistant hardware design, combined with the image adaptive optimization algorithm based on real-time environmental data, the adverse effects of beam scattering caused by high concentration of dust are effectively overcome, ensuring that the projected image remains clear and reliable.

[0024] (3) The device as a whole meets the strict coal mine explosion prevention standards, can project eye-catching safety warning information, and can be linked with the environmental monitoring system to realize real-time visual early warning of safety risks.

[0025] (4) It can serve as a key intelligent node in the underground Internet of Things, and can be deeply linked with centralized control systems, personnel positioning systems, etc. to realize personalized and scenario-based information push based on geographical location and task.

[0026] (5) Information can be updated instantly without contact by remotely updating the projected content, saving material and labor costs. The modular design and long-life light source also reduce the maintenance frequency.

[0027] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0028] To make the objectives, technical solutions, and advantages of the present invention clearer, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein: Figure 1 This is a schematic diagram of the invention; Figure 2 This is a structural diagram of the present invention. Detailed Implementation

[0029] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0030] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the invention. To better illustrate the embodiments of the invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0031] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present invention and 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, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0032] Figure 1 This is a system schematic diagram of the projection lamp used in underground coal mines according to the present invention, showing the information flow and energy flow relationship between the internal module of the projection lamp and the external system.

[0033] Figure 2 This is a schematic diagram of the structure of the projection lamp used in underground coal mines according to the present invention, showing the structural relationship of the main components such as the explosion-proof housing (including the explosion-proof cavity and the intrinsically safe cavity), the heat sink, the lens module, and the lens dust cover.

[0034] I. Detailed Description of the Structure and Key Modules of the Projector Lamp The projection lamp for underground coal mines provided by this invention mainly includes: an explosion-proof shell, an optical projection module, an image generation and control module, an environmental sensing module, and a power supply and communication module.

[0035] 1. Explosion-proof enclosure and safety isolation Explosion-proof cavity: Made of high-strength alloy steel, it houses the heat-generating parts of the optical projection module (such as laser light source, driver board and heat sink), ensuring that the heat source is isolated.

[0036] Intrinsically safe cavity: Made of engineering plastic, it houses the circuitry of the image generation and control module, the environmental perception module, and the power and communication module.

[0037] Connection mechanism: The explosion-proof cavity and the intrinsically safe cavity are connected through an explosion-proof joint surface and through-wall optical fiber or intrinsically safe electrical connector to achieve strict energy isolation and meet the intrinsic safety (Ex ib I Mb) or explosion-proof (Ex d I Mb) level requirements of coal mines.

[0038] 2. Optical projection module Light source: A high-brightness monochromatic or laser light source is configured along the optical path. It is preferred to use a high-brightness white light source formed by exciting a fluorescent ceramic sheet with a blue laser, or a monochromatic laser of a specific wavelength (such as green 520nm) to improve the penetration in dusty environments.

[0039] Imaging device: Digital micromirror device (DMD) or liquid crystal light valve.

[0040] Projection lens assembly: Utilizing a large depth-of-field fixed focal length design, it eliminates the need for frequent refocusing under complex underground working conditions. The lens features a dust-repellent coating to prevent coal dust adhesion.

[0041] Dust protection: The front end is equipped with a pneumatically or electrically retractable dustproof protective cover that can automatically close when not in use or when abnormal vibration is detected, protecting the core optical components.

[0042] 3. Environmental perception module It mainly includes a dust concentration sensor, which is used to detect dust concentration data in the work area in real time.

[0043] External interface: Used to receive data from external systems such as gas monitoring systems, personnel positioning systems, and roof pressure sensors, including real-time gas concentration, personnel location information, and environmental data.

[0044] 4. Image generation and control module This includes an embedded processor and image memory. The processor is the core component for implementing adaptive projection and is responsible for: Receive and parse instructions from the monitoring center.

[0045] The image processing algorithm is run to dynamically adjust the image parameters based on the dust concentration data.

[0046] Control the DMD or light valve of the optical projection module to generate the projected image.

[0047] Control the opening and closing of the dustproof protective lens cover.

[0048] II. Implementation and Adaptive Optimization of Projection Methods The key to the method of this invention lies in adaptive image optimization based on environmental data and multi-system linkage.

[0049] 1. Environment-Adaptive Image Optimization Process 1.1 Data Acquisition: The environmental sensing module acquires dust concentration data in real time.

[0050] 1.2 Concentration Determination: The image generation and control module divides the environment into categories based on dust concentration: Low concentration range: Use standard color or high-contrast white light mode.

[0051] High concentration range (e.g., ≥150 mg / m³) 3 ).

[0052] 1.3 Dynamic Adjustment: When the dust concentration is detected to be in the high concentration range: Mode switching: The system automatically selects a high-contrast monochrome outline mode. For example, complex color animations can be processed into simplified paths and outlines drawn with green or red highlighted lines.

[0053] Parameter enhancement: Significantly enhances image contrast, brightness, and sharpening parameters to counteract the scattering and absorption of light beams by dust, ensuring that the guide map remains clearly legible at a distance of 5 meters.

[0054] 2. Intelligent linkage and risk warning 2.1 Receiving Early Warnings: The environmental sensing module receives danger signals from the gas monitoring system and the roof monitoring system through the external interface, such as gas exceeding the limit (gas concentration > 1.0%) or a sudden increase in roof pressure.

[0055] 2.2 Content Switching: The processor immediately interrupts the current work instruction content and prioritizes switching the projected content to a flashing large yellow exclamation mark and text warnings such as "Top plate is pressing down, suspend hoisting, personnel take shelter".

[0056] 2.3 Safety Cut-off: If a gas over-limit signal is received, in order to comply with the coal mine safety regulations, the image generation and control module sends a command to the optical projection module through the environmental perception module to cut off or reduce the power of the light source.

[0057] 2.4 Status Feedback: The safety warning information is uploaded to the monitoring center through the power supply and communication module, and a local audible and visual alarm is triggered.

[0058] 3. Interaction and Log Management 3.1 Interactive guidance: On-site operators (such as team leaders) can use an intrinsically safe handheld terminal to communicate with the projector via a wireless module to calibrate the projection area and advance the work steps (e.g., clicking "Step Complete" will immediately update the guidance content on the projector).

[0059] 3.2 Log Upload: After the operation is completed, the projector automatically uploads an electronic operation log to the control center via the power supply and communication module (such as industrial Ethernet), which includes the key step switching time points, environmental dust data, and early warning trigger records. This log is used for safety retrospective and efficiency analysis.

[0060] III. Data Support for Implementation Results Taking the replacement of the cutting drum in a fully mechanized mining face as an example: High dust environment: When the dust concentration is as high as 180mg / m³ 3 In this environment, the green outline guide map, optimized by the algorithm, can still be clearly identified by workers within a distance of 5 meters.

[0061] Efficiency Improvement: With the help of projection guidance, the total time to complete the left roller replacement was reduced from an average of 4.5 hours to 3.2 hours, an efficiency improvement of approximately 28%.

[0062] Improved accuracy: The rate of missing key bolts or accidental disconnection of hydraulic lines is 0%.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A projection light for use in underground coal mines, characterized in that: This includes an explosion-proof enclosure for intrinsic safety, an optical projection module for image projection, an image generation and control module for running algorithms and control, an environmental sensing module for real-time environmental monitoring, and a power supply and communication module for power supply and data transmission; wherein: The explosion-proof enclosure consists of an explosion-proof cavity and an intrinsically safe cavity; the explosion-proof cavity is made of high-strength alloy steel and houses the heat-generating part of the optical projection module; the intrinsically safe cavity is made of engineering plastic and houses the circuit parts of the image generation and control module, the environmental sensing module, and the power supply and communication module; the explosion-proof cavity and the intrinsically safe cavity are connected by an explosion-proof mating surface and through-wall optical fiber or electrical connector to achieve energy isolation. The environmental sensing module includes a dust concentration sensor for detecting real-time environmental data and has an external interface for receiving gas concentration data or personnel location information. The image generation and control module includes an embedded processor and an image memory, which are used to dynamically adjust the contrast, brightness and sharpening parameters of the image projected by the optical projection module based on the real-time dust concentration data obtained by the environmental perception module. The optical projection module includes, in sequence along the optical path, a high-brightness monochromatic or laser light source, a digital micromirror device (DMD) or a liquid crystal light valve, and a projection lens assembly. The projection lens assembly adopts a large depth-of-field fixed focal length design and has a dust-repellent coating, and the front end is equipped with a dustproof protective lens cover that can be pneumatically or electrically extended.

2. The projection lamp for underground coal mines according to claim 1, characterized in that: The high-brightness monochromatic or laser light source is a white light source formed by blue laser excitation of a fluorescent ceramic sheet or a monochromatic laser of a specific wavelength.

3. The projection lamp for underground coal mines according to claim 1, characterized in that: The power and communication module provides intrinsically safe power conversion and integrates industrial Ethernet and CAN bus interfaces for remote power supply and communication.

4. The projection lamp for underground coal mines according to claim 1, characterized in that: The power and communication module also integrates an intrinsically safe wireless module for near-field communication with mobile devices.

5. The projection lamp for underground coal mines according to claim 1, characterized in that: The light source of the optical projection module is a monochromatic laser of a specific wavelength. When the dust concentration is higher than the threshold, the image generation and control module automatically selects a high-contrast monochromatic outline mode.

6. A projection method for use in underground coal mines, characterized in that: The method includes the following steps: Step 1: Receive commands and projected content from the control center via the power and communication module; Step 2: Obtain real-time dust concentration data of the work area through the environmental sensing module; Step 3: The image generation and control module dynamically adjusts the contrast, brightness, and sharpening parameters of the image to be projected based on the real-time dust concentration data. Step 4: Project the optimized image onto the target area using an optical projection module; Step 5: By linking the environmental sensing module with the external monitoring system, when dangerous signals such as excessive gas concentration or roof pressure are detected, the projected content is switched to safety warning information.

7. The projection method for underground coal mines according to claim 6, characterized in that: The parameters for dynamically adjusting the image include automatically selecting a high-contrast monochrome outline mode when the dust concentration is higher than a threshold.

8. The projection method for underground coal mines according to claim 6, characterized in that: The method also includes automatically closing the dustproof protective lens cover when in standby mode or when abnormal vibration is detected, through an image generation and control module; The method also includes using an environmental sensing module to cut off or reduce the light source power of the optical projection module when a gas over-limit signal is received.

9. The projection method for underground coal mines according to claim 6, characterized in that: The method also includes uploading operation logs to the control center via a power and communication module. The operation logs include key step switching times, environmental data, and early warning trigger records.

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