CN102797988A - Explosion-proof light emitting diode (LED) lamp - Google Patents

Explosion-proof light emitting diode (LED) lamp Download PDF

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Publication number
CN102797988A
CN102797988A CN2011101390152A CN201110139015A CN102797988A CN 102797988 A CN102797988 A CN 102797988A CN 2011101390152 A CN2011101390152 A CN 2011101390152A CN 201110139015 A CN201110139015 A CN 201110139015A CN 102797988 A CN102797988 A CN 102797988A
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China
Prior art keywords
explosion
light
cavity
proof
lamp
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Pending
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CN2011101390152A
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Chinese (zh)
Inventor
何雷
张佃环
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JIANGSU SUNLIGHT PHOTOELECTRIC CO Ltd
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JIANGSU SUNLIGHT PHOTOELECTRIC CO Ltd
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Priority to CN2011101390152A priority Critical patent/CN102797988A/en
Publication of CN102797988A publication Critical patent/CN102797988A/en
Pending legal-status Critical Current

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Abstract

The invention discloses an explosion-proof light emitting diode (LED) lamp. The lamp is characterized by comprising a light source cavity and a power supply cavity, wherein the upper end of the light source cavity is connected with the lower end of the power supply cavity through a thread structure; and the light source cavity and the power supply cavity form two independent chambers by filling epoxy resin. A high-precision full-thread structure and a double-cavity explosion-proof structure are adopted in all joint surfaces of the lamp and are mutually independent in heat produced in work and danger, so that the explosion-proof effect is excellent; the surface of a shell of the lamp is subjected to high-speed shot blasting treatment and then sprayed with epoxy resin molding powder in a high voltage electrostatic spraying mode, so the lamp has extremely explosion-proof, anticorrosive and antistatic performance; light type and light emitting angle can be accurately controlled, so that the light is soft and does not glare, and the lamp has the characteristics of shock and impact resistance and breakage prevention; and the lamp is light, thin, impact-resistant, shock-resistant and good in comprehensive mechanical property, and the service life of the lamp is prolonged.

Description

The explosion-proof type LED explosion-proof lamp
Technical field
The present invention relates to a kind of explosion-proof lamp; Especially relate to a kind of with the explosion-proof lamp of high-power and high-luminance white light emitting diode as lighting source; Belong to field of illumination lamp technology, be widely used in the Special Work light fixture of special industries such as oil field, petrochemical industry, boats and ships, electric power, railway, mine, military project.
Background technology
Explosion-proof lamp is meant the light fixture for the various certain measures that prevent environment such as explosive mixture on every side such as explosive gas atmosphere, explosive dust atmosphere, methane gas and take.The very important explosion-proof principle of one of them of explosion-proof lamp is exactly the temperature on the case surface that contacts with damp, explosive dust of restriction, component surface or electronic devices and components surface and limits electric contact surface temperature and be lower than its minimum ignition temperature or ignition temperature.And the flame-proof type explosion-proof lamp is wherein a kind of type of explosion proof construc tion; Its shell can bear the flammable mixtures that is penetrated into enclosure through any composition surface of shell or structure interval and can it does not damaged at internal explosion, and can not cause lighting of the outside explosive atmosphere that is formed by a kind of, multiple gases or steam.
Because LED belongs to solid-state cold light source; Be to utilize semiconductor chip as luminescent material; Be encapsulated in the transparent material with certain intensity, have characteristics such as energy-saving and environmental protection, the life-span is long, volume is little, because operating voltage belongs to safe low-voltage, has the advantage of long service life; Therefore large power white light LED is an explosion-proof lamp; A kind of very desirable electric light source of Portable explosion-proof lamp particularly, the LED explosion-proof lamp mainly solves the lighting problem of specific occasion, and it comprises lamp housing, be arranged on the lampshade of lamp housing front end, be arranged at lamp housing inner illuminator and battery, be arranged at the switch on lamp housing surface; Thereby reach desirable illuminating effect through scientific and reasonable luminous intensity distribution again, on explosion-proof lamp, can show its unique one side fully.
Traditional explosion-proof lamp light source and electrical appliance part are in same chamber, and the heat that produces in the course of work adds up, and make the case surface temperature sharply raise, and produce potential safety hazard; The geometry formation more complicated of a chamber to inside exists together; Corner angle are more to cause unbalanced stress and volumetric spaces bigger; Be easy to generate the pressure piling phenomenon, traditional explosion-proof lamp type of explosion proof construc tion also has very strict requirement to the selection of light source, the surface temperature like light source works when good; Colour rendering, and when damaging, whether can produce harmful effect.
Summary of the invention
For solving the deficiency of prior art, the object of the present invention is to provide a kind of explosion-proof type LED explosion-proof lamp that can effectively overcome the technical deficiency of traditional explosion-proof lamp.
Principle of the present invention is: the present invention is through taking special shell composition surface structure; And cable introducing device and translucent cover handled especially; Make the present invention have the light source cavity and the power supply cavity of sufficient intensity; All devices that are easy to generate spark and electric arc and dangerous temperature all are enclosed in its cavity; In two separate cavitys, work, when blasting, can not damage at internal explosion, and can not cause lighting of the outside explosive atmosphere that forms by a kind of, multiple gases or steam through the flammable mixtures that shell composition surface or structure interval are penetrated into enclosure.
The present invention realizes through following technical scheme:
A kind of explosion-proof type LED explosion-proof lamp; It is characterized in that comprise light-source chamber cavity and power source cavity cavity, the upper end of light-source chamber cavity is connected through helicitic texture with the lower end of power source cavity cavity; Adopting helicitic texture can reach explosion-proof composition surface in a disguised form extends; Its propagation of explosion energy is effectively weakened, and light-source chamber cavity and power source cavity cavity form two independent cavity through the epoxy resin embedding, realize that each space all is very little volume.
Above-mentioned light-source chamber cavity comprises glass gland, glass lamp shade, glass clamping pad, light source assembly and light-source chamber housing, wherein, seals through organic silica gel between glass lamp shade and the glass gland; Form gluing faying face, simultaneously, glass lamp shade is pressed in the light-source chamber housing through the glass clamping pad; Wherein, the glass clamping pad adopts the structural carbon steel Q235A of high-quality, makes light fixture antiknock ability strengthen greatly; It is sealed in light source assembly in the light-source chamber housing; And what glass lamp shade adopted is high transmission rate, high-intensity ultrawhite safety glass, promptly refers to the energy impact through 4J, and is to become test through explosive test, popular drama.And in light fixture, advanced the glass after test back light transmittance is handled greater than 88% ultrawhite tempering, described glass gland then is fixedly connected with light source shell through helicitic texture.
And be provided with through wires hole in the middle of the upper end of described light-source chamber housing, also be formed with stepped hole around the described through wires hole, described stepped hole passes through the epoxy resin embedding at the step place.
Above-mentioned power source cavity cavity comprises wire connection cavity housing, clamp nut, clamping cushion block, support and driving power; Wherein, The lower end of wire connection cavity housing is connected with described light-source chamber housing upper end through screw thread, and driving power is arranged between above-mentioned the wire connection cavity housing and light-source chamber housing, and it is fastening through trip bolt; And the top of wire connection cavity housing also is provided with copper washer, clamps cushion block and clamp nut; Described copper washer is arranged on the top that clamps cushion block, and described clamp nut then is socketed in the periphery that clamps cushion block, and cable is through clamping cushion block and copper washer.
Above-mentioned light source assembly comprises aluminium base and many solid state light emitters, and solid state light emitter is the led light source with the title of " green light source ", wherein; Described solid state light emitter evenly distributes along the circular central of aluminium base, and wherein, the colour rendering index of solid state light emitter is greater than 70; Single power is 1w; Single voltage 1-4V, the life-span is greater than 40,000 hours, and do not have mercury metal etc. to the health harmful substance.
Above-mentioned driving power is a LED adjustable constant-flow driving power; It regulates the output of LED light through the control electric current; Heat also has certain variation simultaneously; Thereby reaching the effect of control temperature and light output, can be transferred to needed optical parametric arbitrarily on the one hand, also is a kind of effective means for temperature controlling simultaneously.
Above-mentioned glass gland, light-source chamber housing and wire connection cavity housing form through the die casting of ADC12 die-casting material; And the quality percentage composition of magnesium is less than 6% in the die-casting material; Also add the strength and stiffness that an amount of copper powder increases lamp body simultaneously, thereby this kind die-casting material have high strength, high thermal conductivity.
The above-mentioned light-source chamber housing and the outer surface of wire connection cavity housing are provided with radial heat radiation gear piece, and described heat radiation gear piece is evenly distributed, and form reinforcement.
The above-mentioned light-source chamber housing and the outer surface of wire connection cavity housing also are coated with the epoxy resin molding powder.
Being shaped as of the geometric cross section of the above-mentioned light-source chamber housing and the inner surface of wire connection cavity housing is parabola shaped.
Beneficial effect of the present invention is: high accuracy full thread structure that all faying faces of the present invention all adopt and two-chamber blast resistance construction; Meet the requirement of up-to-date flame-proof type explosion-proof lamp Design of Luminaires; The heat that produces during work and separate when causing danger, explosion-proof effect are excellent more; And pass through high pressure electrostatic painting epoxy resin molding powder again after the case surface process high speed of the present invention Shot Blasting; Has splendid explosion-proof, corrosion-resistant and antistatic property; And can accurately control light type and lighting angle; Make and have the shatter-proof shock-resistant breakage properties that is difficult for by photochromic soft free from glare; In addition, product appearance of the present invention is frivolous, shock-resistant, antidetonation, comprehensive mechanical mechanical property are good, adopt the tempering treatment process glass of the strictness of ultrawhite, the service life of having improved light fixture.
Description of drawings
Fig. 1 is the overall structure sketch map of one embodiment of the invention;
Fig. 2 is the three-dimensional explosive decomposition sketch map of explosion-proof lamp shown in Figure 1.
The implication of each Reference numeral is among the figure:
1, glass gland 2, glass lamp shade 3, glass clamping pad
4, light source assembly 5, light source shell 6, driving power
7, support 8, clamping cushion block 9, clamp nut
10, wire connection cavity housing
The specific embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is done concrete introduction.
For the introducing mode of flame-proof type light fixture, country has made clear and definite regulation, and light fixture has two kinds of introducing modes:
A) introduce indirectly, with terminal box or plug assembly ways of connecting;
B) directly introduce, cable and lead are directly inserted the connected mode of main shell.It should be noted that under the situation that sealing ring is aging or do not press tightly and directly to produce burning or propagation of explosion.
When operate as normal, produce dangerous spark, electric arc or dangerous temperature and shell volume greater than 2000cm 3Or the 4th explosion-proof lamp that divides II C level into of GB3836.1 " explosive gas atmosphere electrical installation part 1: general requirement ", cannot adopt the elastic seal ring compression type directly to introduce mode.
Introduce it indirectly and come down to the device that is prone to generation dangerous spark, electric arc or dangerous temperature is divided into a plurality of cavitys, thereby reach better explosion-proof effect.The explosion-proof type LED explosion-proof lamp has the characteristics of afore mentioned rules; Light fixture preferentially adopts two-chamber or a plurality of cavitys; Be difficult for producing electric arc or spark when at first led light source is originally as its work of solid state light emitter; And be spaced, the easy cavity that produces the device place of spark or electric arc of work is dwindled once more like this, and safety coefficient also increases greatly.
Fig. 1 is the overall structure sketch map of one embodiment of the invention; Fig. 2 is the three-dimensional explosive decomposition sketch map of explosion-proof lamp shown in Figure 1.
As depicted in figs. 1 and 2:
The explosion-proof type LED explosion-proof lamp comprises light-source chamber cavity and power source cavity cavity, and the upper end of light-source chamber cavity is connected through helicitic texture with the lower end of power source cavity cavity; Adopting helicitic texture can reach explosion-proof composition surface in a disguised form extends; Its propagation of explosion energy is effectively weakened, and light-source chamber cavity and power source cavity cavity form two independent cavity through the epoxy resin embedding, realize that each space all is very little volume; Thereby can stand the test that not propagation of explosion test and dynamic pressure test are lighted in strictness and cruel inside; In addition, light-source chamber cavity and power source cavity cavity also through the silicon rubber loop sealing, make light fixture integral protection grade can reach IP65.
And above-mentioned light-source chamber cavity comprises that glass gland 1, glass lamp shade 2, glass clamping pad 3, light source assembly 4 and light-source chamber housing 5 organic silica gels seal, and forms gluing faying face, effectively plays explosion-proof effect; Simultaneously, glass lamp shade 2 is pressed in the light-source chamber housing 5 through glass clamping pad 3, has effectively avoided becoming flexible because of what the long-time vibrations of light fixture caused; Make that gluing explosion-proof effect is effectively guaranteed; Wherein, glass clamping pad 3 adopts the structural carbon steel Q235A of high-quality, makes light fixture antiknock ability strengthen greatly; It is sealed in light source assembly 4 in the light-source chamber housing 5; And what glass lamp shade 2 adopted is high transmission rate, high-intensity ultrawhite safety glass, promptly refers to the energy impact through 4J, and is to become test through explosive test, popular drama.And in light fixture, advanced the glass after test back light transmittance is handled greater than 88% ultrawhite tempering; Glass lamp shade 2 is the tempering treatment process through strictness, and thickness is 12mm, and interface has no the bad phenomenon such as gouge that produce because of grinding to take place; And through popular drama become, explosive test checking back is after qualified; Described glass gland 1 then is fixedly connected with light-source chamber housing 5 through helicitic texture, and through the silicon rubber loop sealing, makes light fixture integral protection grade can reach IP65.
Brightly more specifically be: be provided with through wires hole in the middle of the upper end of light-source chamber housing 5; Also be formed with stepped hole around the described through wires hole; Described stepped hole passes through the epoxy resin embedding at the step place; It is divided into two cavitys up and down, cavity size is reduced greatly, brisance is dwindled much accordingly when meeting accident.
And above-mentioned power source cavity cavity comprises wire connection cavity housing 10, clamp nut 9, clamps cushion block 8 and driving power 6; Wherein, The lower end of wire connection cavity housing 10 is connected with described light-source chamber housing 5 upper ends through screw thread, and driving power 6 is arranged between above-mentioned the wire connection cavity housing 10 and light-source chamber housing 5, and it is fastening through trip bolt; The back side has the gear piece of holding up that the heat of its generation can be left at short notice fast simultaneously; Effectively raise its life-span, and the top of wire connection cavity housing 10 also is provided with copper washer, clamps cushion block 8 and clamp nut 7, described copper washer is arranged on the top that clamps cushion block 8; Described clamp nut 7 then is socketed in the periphery that clamps cushion block 8; And cable is through clamping cushion block 8 and copper washer, and promptly copper washer, clamping cushion block 8 and clamp nut 7 effectively clamp the cable of introducing, and pass through the pull-off verification experimental verification simultaneously.
Wherein, above-mentioned light source assembly 4 comprises aluminium base and many solid state light emitters, and solid state light emitter is the led light source with the title of " green light source "; Wherein, described solid state light emitter evenly distributes along the circular central of aluminium base, wherein; The colour rendering index of solid state light emitter is greater than 70, and single power is 1w, single voltage 1-4V; Life-span is greater than 40,000 hours, and do not have mercury metal etc. to the health harmful substance, and can go out the quantity that light effect and parameter are come suitable increase and reduced led light source according to actual needs; Its mounting means can adopt multiple mounting means such as derrick type, wall-hanging and ceiling type, and is easy and simple to handle, meets the fixed installation technical indicator that improves in the explosion-proof criteria.
Driving power then is a LED adjustable constant-flow driving power; It regulates the output of LED light through the control electric current; Heat also has certain variation simultaneously; Thereby reaching the effect of control temperature and light output, can be transferred to needed optical parametric arbitrarily on the one hand, also is a kind of effective means for temperature controlling simultaneously.
In addition; Above-mentioned glass gland 1, light-source chamber housing 5 and wire connection cavity housing 10 form through the splendid ADC12 die-casting material die casting of high strength, high thermal conductivity, the strict material composition analysis of process and comprehensive mechanical property; And the quality percentage composition of magnesium is less than 6% in the die-casting material; The danger that the spark that has reduced to produce because of bump greatly produces; Add simultaneously the strength and stiffness that an amount of copper powder has increased housing therein; Improve its smear metal property and corrosion resistance, and after passing through high pressure electrostatic painting epoxy resin molding powder again behind the outer surface process high speed ball blast of above-mentioned light-source chamber housing 5 and wire connection cavity housing 10, had splendid explosion-proof, corrosion-resistant and antistatic property.Wherein, The outer surface of described light-source chamber housing 5 and wire connection cavity housing 10 is provided with radial heat radiation gear piece with certain artistic effect; And described heat radiation gear piece is evenly distributed, and forms reinforcement, makes that the mechanical performance of housing is also improved greatly; And the high-precision helicitic texture between glass gland 1 and the light-source chamber housing 5 and between light-source chamber housing 5 and the wire connection cavity housing 10 connects, and makes explosion-proof effect reach the highest explosion proof ratings IIC level very easily.
In addition, above-mentioned light-source chamber housing 5 has certain thickness with wire connection cavity housing 10, and being shaped as of the geometric cross section of inner surface is parabola shaped; Avoid the inner corner angle of lamp body; It is excessive to have strengthened angular structures rounding off or fillet, to reduce the inequality of stress, has avoided the generation of pressure piling phenomenon.
In addition, pick and place for ease etc., on the outer surface of power source cavity cavity, also be provided with support 7.
In a word; The led light source that the present invention adopts belongs to solid-state cold light source; Have the electro-optical efficiency height, caloric value is little, power consumption is little, operating voltage belongs to advantages such as safe low-voltage, long service life, so large power white light LED is a kind of very desirable electric light source of explosion-proof lamp.The light fixture that its unique blast resistance construction is formed is widely used in the Special Work light fixture of special industries such as oil field, petrochemical industry, boats and ships, electric power, railway, mine, military project.
The foregoing description does not limit the present invention in any form, and all employings are equal to the technical scheme that mode obtained of replacement or equivalent transformation, all drop in protection scope of the present invention.

Claims (10)

1. explosion-proof type LED explosion-proof lamp; It is characterized in that; Comprise light-source chamber cavity and power source cavity cavity, the upper end of light-source chamber cavity is connected through helicitic texture with the lower end of power source cavity cavity, and light-source chamber cavity and power source cavity cavity form two independent cavity through the epoxy resin embedding.
2. explosion-proof type LED explosion-proof lamp according to claim 1; It is characterized in that described light-source chamber cavity comprises glass gland, glass lamp shade, glass clamping pad, light source assembly and light-source chamber housing, wherein; Seal through organic silica gel between glass lamp shade and the glass gland; Form gluing faying face, simultaneously, glass lamp shade is pressed in the light-source chamber housing through the glass clamping pad; It is sealed in light source assembly in the light-source chamber housing, and described glass gland then is fixedly connected with light source shell through helicitic texture.
3. explosion-proof type LED explosion-proof lamp according to claim 2; It is characterized in that; Be provided with through wires hole in the middle of the upper end of described light-source chamber housing, also be formed with stepped hole around the described through wires hole, described stepped hole passes through the epoxy resin embedding at the step place.
4. explosion-proof type LED explosion-proof lamp according to claim 3 is characterized in that, described power source cavity cavity comprises wire connection cavity housing, clamp nut, clamping cushion block, support and driving power; Wherein, The lower end of wire connection cavity housing is connected with described light-source chamber housing upper end through screw thread, and driving power is arranged between above-mentioned the wire connection cavity housing and light-source chamber housing, and it is fastening through trip bolt; And the top of wire connection cavity housing also is provided with copper washer, clamps cushion block and clamp nut; Described copper washer is arranged on the top that clamps cushion block, and described clamp nut then is socketed in the periphery that clamps cushion block, and cable is through clamping cushion block and copper washer.
5. explosion-proof type LED explosion-proof lamp according to claim 4 is characterized in that, described light source assembly comprises aluminium base and many solid state light emitters; Wherein, described solid state light emitter evenly distributes along the circular central of aluminium base, wherein; The colour rendering index of solid state light emitter is greater than 70; Single power is 1w, single voltage 1-4V, and the life-span was greater than 40,000 hours.
6. explosion-proof type LED explosion-proof lamp according to claim 4 is characterized in that, described driving power is a LED adjustable constant-flow driving power.
7. explosion-proof type LED explosion-proof lamp according to claim 4 is characterized in that, described glass gland, light-source chamber housing and wire connection cavity housing form through the die casting of ADC12 die-casting material, and in the die-casting material quality percentage composition of magnesium less than 6%.
8. explosion-proof type LED explosion-proof lamp according to claim 4 is characterized in that, the outer surface of described light-source chamber housing and wire connection cavity housing is provided with radial heat radiation gear piece, and described heat radiation gear piece is evenly distributed, and forms reinforcement.
9. explosion-proof type LED explosion-proof lamp according to claim 4 is characterized in that, the outer surface of described light-source chamber housing and wire connection cavity housing also is coated with the epoxy resin molding powder.
10. explosion-proof type LED explosion-proof lamp according to claim 4 is characterized in that, being shaped as of the geometric cross section of the inner surface of described light-source chamber housing and wire connection cavity housing is parabola shaped.
CN2011101390152A 2011-05-27 2011-05-27 Explosion-proof light emitting diode (LED) lamp Pending CN102797988A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104033859A (en) * 2013-03-07 2014-09-10 深圳市海洋王照明工程有限公司 Explosion-proof lamp and explosion suppression joint structure
CN107471208A (en) * 2017-08-31 2017-12-15 广州泰行智能科技有限公司 A kind of six axis robot
CN108613138A (en) * 2018-05-10 2018-10-02 南安市创培电子科技有限公司 A kind of radiation-proof lampshade of LED illumination device
CN109237388A (en) * 2018-10-25 2019-01-18 新黎明科技股份有限公司 A kind of emergency lighting and the compound lamps and lanterns of exit signs
CN113007681A (en) * 2021-03-12 2021-06-22 海洋王(东莞)照明科技有限公司 Explosion-proof lamp
CN114247737A (en) * 2021-12-20 2022-03-29 马英武 LED lamp shade recovery plant

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Publication number Priority date Publication date Assignee Title
CN201443739U (en) * 2008-11-25 2010-04-28 董丽霞 LED explosion proof lamp
CN201526855U (en) * 2009-10-20 2010-07-14 南京汉德森科技股份有限公司 LED explosion-proof type lamp
CN201599588U (en) * 2009-11-06 2010-10-06 绍兴晶彩光电技术有限公司 Led anti-explosion lamp
CN101886800A (en) * 2010-06-30 2010-11-17 海洋王照明科技股份有限公司 Radiating shell structure of explosion-proof lamp and explosion-proof lamp
JP2010277828A (en) * 2009-05-28 2010-12-09 Japan Outdoor Lighting Mfg Co Ltd Light emitting unit for street light

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201443739U (en) * 2008-11-25 2010-04-28 董丽霞 LED explosion proof lamp
JP2010277828A (en) * 2009-05-28 2010-12-09 Japan Outdoor Lighting Mfg Co Ltd Light emitting unit for street light
CN201526855U (en) * 2009-10-20 2010-07-14 南京汉德森科技股份有限公司 LED explosion-proof type lamp
CN201599588U (en) * 2009-11-06 2010-10-06 绍兴晶彩光电技术有限公司 Led anti-explosion lamp
CN101886800A (en) * 2010-06-30 2010-11-17 海洋王照明科技股份有限公司 Radiating shell structure of explosion-proof lamp and explosion-proof lamp

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104033859A (en) * 2013-03-07 2014-09-10 深圳市海洋王照明工程有限公司 Explosion-proof lamp and explosion suppression joint structure
CN104033859B (en) * 2013-03-07 2017-10-24 深圳市海洋王照明工程有限公司 Explosion-proof lamp and its flame proof joint design
CN107471208A (en) * 2017-08-31 2017-12-15 广州泰行智能科技有限公司 A kind of six axis robot
CN108613138A (en) * 2018-05-10 2018-10-02 南安市创培电子科技有限公司 A kind of radiation-proof lampshade of LED illumination device
CN109237388A (en) * 2018-10-25 2019-01-18 新黎明科技股份有限公司 A kind of emergency lighting and the compound lamps and lanterns of exit signs
CN113007681A (en) * 2021-03-12 2021-06-22 海洋王(东莞)照明科技有限公司 Explosion-proof lamp
CN114247737A (en) * 2021-12-20 2022-03-29 马英武 LED lamp shade recovery plant
CN114247737B (en) * 2021-12-20 2023-11-03 江苏烨明光电有限公司 LED lamp shade recovery plant

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Application publication date: 20121128