CN112594576A - Intelligent illuminating system for underground roadway of non-coal mine - Google Patents

Intelligent illuminating system for underground roadway of non-coal mine Download PDF

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Publication number
CN112594576A
CN112594576A CN202011514783.7A CN202011514783A CN112594576A CN 112594576 A CN112594576 A CN 112594576A CN 202011514783 A CN202011514783 A CN 202011514783A CN 112594576 A CN112594576 A CN 112594576A
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CN
China
Prior art keywords
lamp
pipeline
lamp holder
illuminating
lampshade
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202011514783.7A
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Chinese (zh)
Inventor
刘鲲
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nanjing Tanzheng Electronic Technology Co ltd
Original Assignee
Nanjing Tanzheng Electronic Technology Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nanjing Tanzheng Electronic Technology Co ltd filed Critical Nanjing Tanzheng Electronic Technology Co ltd
Priority to CN202011514783.7A priority Critical patent/CN112594576A/en
Publication of CN112594576A publication Critical patent/CN112594576A/en
Pending legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21SNON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S6/00Lighting devices intended to be free-standing
    • F21S6/005Lighting devices intended to be free-standing with a lamp housing maintained at a distance from the floor or ground via a support, e.g. standing lamp for ambient lighting
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V17/00Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages
    • F21V17/10Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages characterised by specific fastening means or way of fastening
    • F21V17/104Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages characterised by specific fastening means or way of fastening using feather joints, e.g. tongues and grooves, with or without friction
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V23/00Arrangement of electric circuit elements in or on lighting devices
    • F21V23/003Arrangement of electric circuit elements in or on lighting devices the elements being electronics drivers or controllers for operating the light source, e.g. for a LED array
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50Cooling arrangements
    • F21V29/70Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
    • F21V29/74Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades
    • F21V29/76Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical parallel planar fins or blades, e.g. with comb-like cross-section
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/85Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems characterised by the material
    • F21V29/89Metals
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V31/00Gas-tight or water-tight arrangements
    • F21V31/005Sealing arrangements therefor
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21WINDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2131/00Use or application of lighting devices or systems not provided for in codes F21W2102/00-F21W2121/00
    • F21W2131/40Lighting for industrial, commercial, recreational or military use
    • F21W2131/402Lighting for industrial, commercial, recreational or military use for working places

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)

Abstract

The invention relates to an intelligent illuminating system for underground tunnels of non-coal mines, which comprises a plurality of pipelines, wherein each pipeline is provided with a plurality of illuminating lamps, all pipelines are sequentially numbered, the illuminating lamps on each pipeline are sequentially numbered, a temperature sensor is arranged in a lampshade, the number of the temperature sensor is consistent with that of the illuminating lamps, the temperature sensor is connected with a power regulator, when the temperature sensor senses that the temperature in the lampshade is high, the power regulator is regulated to reduce the output power of a lamp holder, a luminous body becomes dark, the power regulator is turned off after the temperature in the lampshade is dissipated, the output power of the lamp holder is recovered, and the luminous body illuminates normally; all the temperature sensors are connected to a PCL controller, and according to the pipeline number and the illuminating lamp number, the PCL controller controls the adjacent pipelines and the adjacent illuminating lamps on each pipeline to be turned off at different times. The intelligent control system intelligently controls the power of the illuminating lamp, prevents the illuminating lamp from being overheated, ensures the service life of the illuminating lamp and also ensures the illumination brightness of the environment.

Description

Intelligent illuminating system for underground roadway of non-coal mine
Technical Field
The invention relates to an intelligent illuminating system for an underground roadway of a non-coal mine, belonging to the technical field of illuminating systems.
Background
The underground illumination of the non-coal mine is required to be normally clear within 24 hours, if the illuminating lamp is always in a high-intensity illumination state, the heating can be continuously carried out, the temperature in the lamp cover is increased, if the illuminating lamp cannot be adjusted, the heating is always in a state of being larger than the heat dissipation state, the damage of the illuminating lamp is inevitable, if the heat dissipation is larger than the illuminating lamp which continuously works to generate heat, the cost of the illuminating lamp is greatly increased, the size of the illuminating lamp is increased, the capital and the resources are also infeasible, therefore, how to adjust the illuminating lamp is realized, the illuminating lamp can continuously illuminate, the heat accumulation cannot be caused, the service life is well prolonged, and the underground illuminating lamp is a research direction for the underground operation.
Disclosure of Invention
In order to solve the technical problems, the invention provides an intelligent illuminating system for a non-coal mine underground roadway, which has the following specific technical scheme:
an intelligent illuminating system for underground tunnels of non-coal mines comprises a plurality of pipelines, wherein each pipeline is provided with a plurality of illuminating lamps, all pipelines are sequentially numbered, the illuminating lamps on each pipeline are sequentially numbered, each illuminating lamp comprises a lamp shade, a luminous body, a lamp holder and a lamp holder, a temperature sensor is arranged in the lamp shade, the number of the temperature sensor is consistent with that of the illuminating lamps, the temperature sensor is connected with a power regulator, the power regulator is positioned in the lamp holder,
the temperature sensor senses that the temperature in the lamp shade is higher than 60 ℃, the power regulator is regulated, the output power of the lamp holder is reduced, the luminous body becomes dark, after the temperature in the lamp shade is dissipated and is lower than 35 ℃, the power regulator is turned off, the output power of the lamp holder is recovered, and the luminous body illuminates normally;
all the temperature sensors are connected to a PCL controller, and according to the pipeline number and the illuminating lamp number, the PCL controller controls the adjacent pipelines and the adjacent illuminating lamps on each pipeline to be turned off at different times.
Furthermore, the numbers of the pipelines are numbered in the alphabetical sequence, the letters of the pipelines are added with the numbers for the lighting lamps on each pipeline, the letters are not changed, the numbers are increased in sequence,
the PCL controller is internally provided with pipelines which can only close nonadjacent letter numbers at each time, and on each pipeline, the last bit of the number of the illuminating lamp cannot be an odd number or an even number at the same time.
Further, the output power of the lamp holder is 40W, the adjusting power of the power adjuster is 30W, and the output power of the lamp holder is adjusted to 10W.
Furthermore, the luminous body sets up in the lamp shade, is connected with the lamp holder, the lamp holder is connected with the lamp stand, be provided with threaded connection pipe on the lamp stand, the lamp holder includes and is connected the lamp holder pole with threaded connection pipe, the outside of lamp holder pole is provided with the stand tube, the outside of threaded connection pipe is provided with the sealed tube, when lamp holder pole screw thread was screwed up in threaded connection pipe, the stand tube was inserted in the sealed tube.
Furthermore, the outer wall of the sealing pipe is also provided with a circle of plugging grooves, and the tail ends of the sealing pipe are inserted into the plugging grooves.
Furthermore, a radiator is arranged in the lampshade, extends out of the lampshade from the inside of the lampshade, and horizontally diffuses towards the periphery of the lampshade outside the lampshade.
Furthermore, an inwards concave groove is formed in the contact position of the heat radiation body and the lampshade, the lampshade is inserted into the groove, and a silica gel layer is paved on the inner wall of the groove.
Furthermore, the radiator is made of an aluminum sheet, the aluminum sheet surrounds the illuminant for a circle, and fins perpendicular to the aluminum sheet are uniformly distributed on two sides of the aluminum sheet.
The invention has the beneficial effects that:
according to the invention, the lighting pipelines in the system are numbered in sequence, and the lighting lamps on each pipeline are numbered in sequence, so that the adjacent pipelines and the adjacent lighting lamps on each pipeline can be controlled in the PLC according to the number adjusting setting conditions, and the adjacent lighting lamps on each pipeline are not required to be adjusted to low power at the same time, thereby ensuring the ambient brightness, adjusting part of the lighting lamps, ensuring that the heat dissipation of the lighting lamps is larger than the heat dissipation of the lighting lamps, and prolonging the service life.
According to the invention, by arranging the multilayer pipeline overlapping sleeves, mechanical sealing is realized, and the device is suitable for the humid environment of non-coal mines.
According to the invention, the heat radiation body is arranged in the lampshade and extends out of the lampshade, so that the heat radiation efficiency is improved.
Drawings
Figure 1 is a partial side cross-sectional view of the overall structure of the invention,
figure 2 is a schematic view of a heat sink of the present invention,
in the figure: the lamp comprises a lamp shade 1, a heat radiation body 2, a light emitting body 3, an isolation tube 4, a groove 5, a thread 6, a sealing tube 7, a lamp holder 8, a threaded connection tube 9, a lamp holder rod 10 and a fin 11.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.
As shown in fig. 1, the intelligent lighting system for the underground roadway of the non-coal mine comprises a plurality of pipelines, wherein a plurality of lighting lamps are arranged on each pipeline, all pipelines are sequentially numbered, the lighting lamps on each pipeline are sequentially numbered, each lighting lamp comprises a lamp shade 1, a luminous body 3, a lamp holder and a lamp holder 8, a temperature sensor is arranged in each lamp shade 1, the number of the temperature sensor is consistent with that of the lighting lamp, the temperature sensor is connected with a power regulator, the power regulator is positioned in each lamp holder 8, the temperature sensor senses that the temperature in each lamp shade 1 is higher than 60 ℃, the power regulator is regulated, the output power of each lamp holder 8 is reduced, the luminous bodies 3 are darkened, after the temperature in each lamp shade 1 is dissipated, the temperature is lower than 35 ℃, the power regulator is turned off, the output power of each lamp holder 8 is recovered, and the luminous bodies 3 illuminate normally. Realize the intelligent regulation of light, prevent that the too high burning out that causes of light temperature.
For automatic control, the distribution of the illuminating lamps capable of reducing power at the same time can be set, so that the situation that the power of all illuminating lamps in one area is reduced, and the light of partial areas is too dark to influence normal work is avoided. All the temperature sensors are connected to a PCL controller, and according to the pipeline number and the illuminating lamp number, the PCL controller controls the adjacent pipelines and the adjacent illuminating lamps on each pipeline to be turned off at different times.
An embodiment for realizing that the same regional illuminating lamp is not turned off at the same time is given below, the number of the pipeline is numbered by letter sequence, the illuminating lamp on each pipeline is numbered by the letter of the pipeline plus the number, the letter is unchanged, the number is increased in sequence, the PCL controller is internally provided with the pipeline which can only turn off the nonadjacent letter number at each time, and on each pipeline, the last digit of the number of the illuminating lamp can not be an odd number or an even number at the same time.
An embodiment of the power regulation of the lamp base 8 is given below, the output power of the lamp base 8 being 40W, the regulated power of the power regulator being 30W, the output power of the lamp base 8 being regulated to 10W. In practical application, the output power and the reduced power can be automatically adjusted according to the use environment, and the adjusted output power is avoided, so that the cooling efficiency is improved, the illumination can be recovered more quickly, and the opportunity that the adjacent illumination lamps can adjust the reduced power is increased.
The connection relation between a lamp cap and a lamp holder 8 for lighting is given below, the luminous body 3 is arranged in the lampshade 1 and connected with the lamp cap, the lamp cap is connected with the lamp holder 8, a threaded connecting pipe 9 is arranged on the lamp holder 8, the lamp cap comprises a lamp cap rod 10 connected with the threaded connecting pipe 9, a part of the lamp cap rod 10 is provided with a thread 6, and the thread 6 is arranged from the tail end thread of the lamp cap rod 10 to a position close to the middle of the lamp cap rod in the axial direction. The lamp holder rod 10 is externally provided with a spacer tube, the threaded connection tube 9 is externally provided with a sealing tube 7, and the spacer tube 4 is inserted into the sealing tube 7 when the lamp holder rod 10 is screwed into the threaded connection tube 9. The isolation tube 4 and the sealing tube 7 realize double-layer sealing.
In order to prevent the end of the outermost sealing tube 7 from being penetrated by moist air, the outer wall of the sealing tube 7 is further provided with a ring of grooves 5, and the tail end of the sealing tube 7 is inserted into the grooves 5.
According to the invention, the length of the threaded connecting pipe 9 is smaller than that of the isolating pipe 4 and the lamp tube rod, when the threaded connecting pipe 9 and the lamp holder rod 10 are connected to the bottom, one end of the isolating pipe 4 close to the lampshade 1 is provided with a section of cavity, the side wall of the threaded connecting pipe 9 close to the lamp holder 8 is provided with a vent hole, and in the process of connecting the threaded connecting pipe 9 and the lamp holder rod 10, air in the threaded connecting pipe 9 and air in a gap between the isolating pipe 4 and the sealing pipe 7 penetrate through the vent hole to enter the cavity between the tail end of the threaded connecting pipe 9 and the lampshade 1. The gas is transferred into the cavity, only a trace amount of pressure change is increased, the influence on the cavity is very little, however, the circuitous mechanical sealing effect can achieve almost complete sealing, and the long-term sealing effect can be achieved in a humid and large-dust environment for a long time.
In order to realize that the heat in the lampshade 1 can be rapidly dissipated, the lampshade 1 is internally provided with a radiator 2, and the radiator 2 extends out of the lampshade 1 from the lampshade 1 and horizontally diffuses towards the periphery of the lampshade 1 outside the lampshade 1. The heat dissipation area can be increased by horizontal diffusion, in order to further increase the heat dissipation area and the heat dissipation effect, the heat dissipation body 2 is made of an aluminum sheet, the aluminum sheet surrounds the luminous body 3 for a circle, and fins 11 perpendicular to the aluminum sheet are uniformly distributed on two sides of the aluminum sheet, as shown in fig. 2. The fins 11 are made of aluminum.
In order to realize the sealing of the heat radiator 2 and the lampshade 1, the joint of the heat radiator 2 and the lampshade 1 is not provided with the fin 11, the lampshade 1 and the heat radiator 2 are directly connected and sealed, the contact part of the heat radiator 2 and the lampshade 1 is provided with an inward concave groove, the lampshade 1 is inserted into the groove, the inner wall of the groove is paved with a silica gel layer, or the two sides of the groove are welded and fixed with the heat radiator 2, and a weld seam is covered with the silica gel layer.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims (8)

1. The utility model provides a non-colliery mountain underworkings intelligence lighting system which characterized in that: comprises a plurality of pipelines, each pipeline is provided with a plurality of illuminating lamps, all pipelines are numbered in sequence, the illuminating lamps on each pipeline are numbered in sequence, each illuminating lamp comprises a lampshade, a luminous body, a lamp holder and a lamp holder, a temperature sensor is arranged in the lampshade, the number of the temperature sensor is consistent with that of the illuminating lamps, the temperature sensor is connected with a power regulator, the power regulator is positioned in the lamp holder,
the temperature sensor senses that the temperature in the lamp shade is higher than 60 ℃, the power regulator is regulated, the output power of the lamp holder is reduced, the luminous body becomes dark, after the temperature in the lamp shade is dissipated and is lower than 35 ℃, the power regulator is turned off, the output power of the lamp holder is recovered, and the luminous body illuminates normally;
all the temperature sensors are connected to a PCL controller, and according to the pipeline number and the illuminating lamp number, the PCL controller controls the adjacent pipelines and the adjacent illuminating lamps on each pipeline to be turned off at different times.
2. The non-coal mine underground roadway intelligent lighting system according to claim 1, wherein: the serial numbers of the pipelines are numbered in alphabetical sequence, the illuminating lamp on each pipeline is numbered by adding numbers to the letters of the pipeline, the letters are unchanged, the numbers are increased in sequence,
the PCL controller is internally provided with pipelines which can only close nonadjacent letter numbers at each time, and on each pipeline, the last bit of the number of the illuminating lamp cannot be an odd number or an even number at the same time.
3. The non-coal mine underground roadway intelligent lighting system according to claim 1, wherein: the output power of the lamp holder is 40W, the adjusting power of the power adjuster is 30W, and the output power of the lamp holder is adjusted to 10W.
4. The non-coal mine underground roadway intelligent lighting system according to claim 1, wherein: the lamp comprises a lampshade, a lamp holder, a lamp base, a threaded connecting pipe, a lamp cap rod, an isolation pipe and a sealing pipe, wherein the lamp holder is arranged in the lampshade and connected with the lamp holder, the lamp holder is connected with the lamp base, the threaded connecting pipe is arranged on the lamp base, the lamp holder is connected with the lamp cap rod through the threaded connecting pipe, the isolation pipe is arranged outside the lamp cap rod, the sealing pipe is arranged outside the threaded connecting pipe, and when the lamp cap rod is screwed in the threaded connecting pipe in.
5. The non-coal mine underground roadway intelligent lighting system according to claim 4, wherein: the outer wall of the sealing pipe is also provided with a circle of plugging grooves, and the tail ends of the sealing pipes are inserted into the plugging grooves.
6. The non-coal mine underground roadway intelligent lighting system according to claim 1, wherein: the lamp shade is internally provided with a radiator, and the radiator extends out of the lamp shade from the interior of the lamp shade and horizontally diffuses towards the periphery of the lamp shade outside the lamp shade.
7. The intelligent lighting system for the non-coal mine underground roadway according to claim 6, wherein: the lamp shade is inserted into the groove, and a silica gel layer is laid on the inner wall of the groove.
8. The intelligent lighting system for the non-coal mine underground roadway according to claim 6, wherein: the radiator is made of an aluminum sheet, the aluminum sheet surrounds the illuminant for one circle, and fins perpendicular to the aluminum sheet are uniformly distributed on two sides of the aluminum sheet.
CN202011514783.7A 2020-12-21 2020-12-21 Intelligent illuminating system for underground roadway of non-coal mine Pending CN112594576A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011514783.7A CN112594576A (en) 2020-12-21 2020-12-21 Intelligent illuminating system for underground roadway of non-coal mine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011514783.7A CN112594576A (en) 2020-12-21 2020-12-21 Intelligent illuminating system for underground roadway of non-coal mine

Publications (1)

Publication Number Publication Date
CN112594576A true CN112594576A (en) 2021-04-02

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1921720A (en) * 2006-09-07 2007-02-28 刘华友 Lighting lamp
CN102413602A (en) * 2011-07-23 2012-04-11 李鸿 Intelligent limit temperature protection device of LED (light-emitting diode) street lamp
CN103216771A (en) * 2013-04-26 2013-07-24 中国矿业大学 Light-emitting diode (LED) street lamp based on wireless sensor network and temperature adjustment method of same
CN203615140U (en) * 2013-12-04 2014-05-28 沈阳市中兴防爆电器总厂 Self-cooling explosion-proof LED light source with controllable temperature
CN104344371A (en) * 2013-08-02 2015-02-11 深圳市海洋王照明工程有限公司 Lamp sealing structure and lamp
CN204513145U (en) * 2015-04-16 2015-07-29 祥华防爆电器有限公司 Explosion suppression type explosion-preventing lamp

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1921720A (en) * 2006-09-07 2007-02-28 刘华友 Lighting lamp
CN102413602A (en) * 2011-07-23 2012-04-11 李鸿 Intelligent limit temperature protection device of LED (light-emitting diode) street lamp
CN103216771A (en) * 2013-04-26 2013-07-24 中国矿业大学 Light-emitting diode (LED) street lamp based on wireless sensor network and temperature adjustment method of same
CN104344371A (en) * 2013-08-02 2015-02-11 深圳市海洋王照明工程有限公司 Lamp sealing structure and lamp
CN203615140U (en) * 2013-12-04 2014-05-28 沈阳市中兴防爆电器总厂 Self-cooling explosion-proof LED light source with controllable temperature
CN204513145U (en) * 2015-04-16 2015-07-29 祥华防爆电器有限公司 Explosion suppression type explosion-preventing lamp

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Application publication date: 20210402