CN115854306B - Embedded movable lighting lamp for jewelry finishing - Google Patents
Embedded movable lighting lamp for jewelry finishing Download PDFInfo
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- CN115854306B CN115854306B CN202211476462.1A CN202211476462A CN115854306B CN 115854306 B CN115854306 B CN 115854306B CN 202211476462 A CN202211476462 A CN 202211476462A CN 115854306 B CN115854306 B CN 115854306B
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Abstract
The invention discloses an embedded movable lighting lamp for jewelry finish machining, which comprises a lamp shade, wherein second threaded rods are arranged on two sides of the inner top of the lamp shade, second gears are arranged on the top of the outer sides of the second threaded rods, connecting blocks are arranged at the bottoms of the outer sides of two groups of the second threaded rods, and a heat dissipation assembly is arranged on one side, close to each other, of each connecting block. The invention can move the illuminating lamp panel, can store the illuminating lamp panel into the lamp shade, drives the second annular rack to rotate by rotating the rotary ring, and drives the two groups of second threaded rods to rotate by mutually meshing the second annular rack and the second gear, and the two groups of second threaded rods drive the connecting blocks to move up and down under the action of threads, so that the illuminating lamp panel can be stored into the lamp shade when in use, the damage of the illuminating lamp panel is reduced, and the scald caused by accidental contact of operators can be prevented.
Description
Technical Field
The invention relates to the technical field of lighting lamps, in particular to an embedded movable lighting lamp for jewelry finish machining.
Background
With the development of society and economy, the concept of jewelry should be expanded to include gold, silver, jewelry, and the like, in addition to natural precious stones and artificial precious stones. The industry that manages these items is collectively referred to as the "jewelry industry". The scope of "jewelry" is much greater than the broad concept of "precious stone". Precious stones in a broad sense refer generally to those materials that are suitable for being cut or carved into jewelry or artwork, and require illumination devices for the processing of jewelry.
The current lighting devices have certain disadvantages:
when current illumination lamps and lanterns are using, the light is fixed on the mesa this moment generally, and the light is fixed on the lamp stand generally, and the surface of light can a large amount of heats when long-time use, if careless touching can lead to the scald of skin, and the light exposes in the outside and damages easily.
Meanwhile, when the high-power illuminating lamp is used, a lamp holder can generate a large amount of heat, and a common illuminating lamp is usually provided with a radiating groove only at the outer side, so that heat is discharged slower than the generated heat, the heat is converged in the lamp holder, and the illuminating lamp is easy to damage at high temperature.
Meanwhile, the illuminating lamp cannot well collect and diffuse the lamplight, when finer processing is carried out, the intensity of illumination is required to be high, so that the processing is more accurate, and the use of the illuminating lamp is limited.
Disclosure of Invention
The present invention aims to provide an embedded movable lighting fixture for jewelry finishing, which solves the related problems set forth in the background art.
In order to achieve the above purpose, the present invention provides the following technical solutions: the utility model provides an embedded movable illumination lamps and lanterns for jewelry finish machining, includes the lamp shade, the both sides at the inside top of lamp shade are provided with the second threaded rod, the top in the second threaded rod outside is provided with the second gear, two sets of the bottom in the second threaded rod outside is provided with the connecting block, two sets of one side that the connecting block is close to each other is provided with cooling module, the top cover in the lamp shade outside is equipped with the rotation ring, the intermediate position department that rotates the ring inboard is provided with the second annular rack, the top of the inside both sides of lamp shade is provided with the gear groove, annular spout has been seted up at the top in the lamp shade outside, the bottom in the lamp shade outside is provided with spotlight assembly.
Preferably, the radiating component comprises a radiating cover, a radiating fan, a first radiating fin, air outlet holes, an opening, a second radiating fin, a lamp plate and a lamp holder, wherein the radiating cover is positioned on one side of the two groups of connecting blocks, the top of the two ends inside the radiating cover is provided with the radiating fan, the bottom of the outer side of the radiating cover is provided with a plurality of groups of first radiating fins, the bottom of the radiating cover is provided with the lamp holder, the outer side of the lamp holder is uniformly provided with a plurality of groups of air outlet holes, the middle position of the bottom of the lamp holder is provided with the opening, the two sides of the bottom of the lamp holder are provided with the lamp plate, and the top of the lamp plate is provided with the second radiating fins.
Preferably, the spotlight subassembly includes installing frame, spacing spout, first threaded rod, first gear, connecting rod, first annular rack and reflective lamp cover, the installing frame is located the bottom in the lamp shade outside, the inboard top of installing frame evenly is provided with four sets of first threaded rods, four sets of the outside threaded connection of first threaded rod has the connecting rod, four sets of one side that the connecting rod is close to each other is provided with reflective lamp cover, spacing spout has been seted up at the inside both sides and both ends of installing frame, four sets of one side that first threaded rod kept away from each other is provided with first gear, the intermediate position department slip in the lamp shade outside is provided with first annular rack.
Preferably, an annular groove is formed in the middle position of the outer side of the mounting frame, and the first annular rack is located in the annular groove to slide.
Preferably, an air inlet is formed in the top of the inside of the heat dissipation cover, a filter screen is arranged at the top of the heat dissipation cover, and the air inlet is located right below the filter screen.
Preferably, the second annular rack slides in the annular chute, the second gear is located in the gear groove, and the second annular rack and the second gear are meshed with each other.
Preferably, a plurality of groups of heat dissipation grooves are formed in the middle position of the outer side of the lampshade.
Preferably, the top of the connecting rod extends to the inside of the limiting chute, and the connecting rod and the limiting chute slide mutually.
Preferably, the first gear is located above the first annular rack, and the first gear and the first annular rack are meshed with each other.
Preferably, the edge of the bottom of the lamp holder is provided with a glass lampshade, and the edge of the bottom of the glass lampshade is arc-shaped.
Compared with the prior art, the invention provides the embedded movable lighting lamp for jewelry finish machining, which has the following beneficial effects:
1. the invention can move the illuminating lamp panel, can store the illuminating lamp panel into the lamp shade, drives the second annular rack to rotate by rotating the rotary ring, and drives the two groups of second threaded rods to rotate by mutually meshing the second annular rack and the second gear, and the two groups of second threaded rods drive the connecting blocks to move up and down under the action of threads, so that the illuminating lamp panel can be stored into the lamp shade when in use, the damage of the illuminating lamp panel is reduced, and the scald caused by accidental contact of operators can be prevented.
2. When the heat radiation fan is used for working on the lighting lamp plate, the lighting lamp plate can be blown, the second radiating fins are fixedly connected with the lighting lamp plate, heat generated by the lighting lamp plate is transferred to the inside of the second radiating fins, meanwhile, the first radiating fins can absorb the heat in the heat radiation cover and transfer the heat to the outside of the heat radiation cover, and air flow generated by the heat radiation fan blows the heat around the second radiating fins into the inside of the heat radiation cover through the plurality of groups of air outlet holes, so that the lighting lamp plate can radiate, and the heat radiation effect is improved.
3. The invention forms the light reflecting lamp shade through the mutual polymerization of the four groups of light reflecting lamp shades, can gather the light generated by the illuminating lamp plate into a smaller area, so that the intensity of the light is higher under the light reflection of the light reflecting lamp shade, the light can be observed more carefully during jewelry processing, and the error during jewelry processing is reduced.
Drawings
FIG. 1 is a front cross-sectional view of the present invention;
FIG. 2 is a front view of the present invention;
figure 3 is a top cross-sectional view of the globe of the present invention;
FIG. 4 is a schematic diagram of a heat dissipating assembly according to the present invention;
FIG. 5 is a schematic view of a condensing module according to the present invention;
fig. 6 is a bottom view of the light focusing assembly of the present invention.
In the figure: 1. a lamp shade; 2. a heat dissipation assembly; 201. a heat dissipation cover; 202. a heat radiation fan; 203. a first heat sink; 204. an air outlet hole; 205. an opening; 206. a second heat sink; 207. a lamp panel; 208. a lamp holder; 3. a light gathering assembly; 301. a mounting frame; 302. limiting sliding grooves; 303. a first threaded rod; 304. a first gear; 305. a connecting rod; 306. a first annular rack; 307. a reflective lamp shade; 4. a second gear; 5. rotating the circular ring; 6. a second annular rack; 7. a connecting block; 8. a second threaded rod; 9. an annular chute; 10. a gear groove.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1-6, the present invention provides the following technical solutions: a embedded movable illumination lamps and lanterns for jewelry finish machining, including lamp shade 1, the both sides at the inside top of lamp shade 1 are provided with second threaded rod 8, the top in the second threaded rod 8 outside is provided with second gear 4, the bottom in the 8 outsides of two sets of second threaded rods is provided with connecting block 7, one side that two sets of connecting blocks 7 are close to each other is provided with radiator unit 2, the top cover in the lamp shade 1 outside is equipped with rotates ring 5, the intermediate position department that rotates ring 5 inboard is provided with second annular rack 6, the top of the inside both sides of lamp shade 1 is provided with gear groove 10, annular spout 9 has been seted up at the top in the lamp shade 1 outside, the bottom in the lamp shade 1 outside is provided with spotlight unit 3.
As a preferable scheme of the present embodiment: the heat radiation assembly 2 comprises a heat radiation cover 201, a heat radiation fan 202, a first heat radiation fin 203, an air outlet hole 204, an opening 205, a second heat radiation fin 206, a lighting lamp plate 207 and a lamp holder 208, wherein the heat radiation cover 201 is positioned on one side, close to each other, of the two groups of connecting blocks 7, the heat radiation fan 202 is arranged at the top of two ends inside the heat radiation cover 201, a plurality of groups of first heat radiation fins 203 are arranged at the bottom of the outer side of the heat radiation cover 201, the lamp holder 208 is arranged at the bottom of the heat radiation cover 201, a plurality of groups of air outlet holes 204 are uniformly arranged at the outer side of the lamp holder 208, the opening 205 is arranged at the middle position of the bottom of the lamp holder 208, the lighting lamp plates 207 are arranged on two sides of the bottom of the lamp holder 208, the second heat radiation fin 206 is arranged at the top of the lighting lamp plate 207, and the lighting lamp plate 207 can radiate heat rapidly.
As a preferable scheme of the present embodiment: the condensing assembly 3 comprises a mounting frame 301, limiting sliding grooves 302, first threaded rods 303, first gears 304, connecting rods 305, first annular racks 306 and a reflective lampshade 307, wherein the mounting frame 301 is located at the bottom of the outer side of the lampshade 1, four groups of first threaded rods 303 are uniformly arranged at the top of the inner side of the mounting frame 301, the connecting rods 305 are connected with the outer sides of the four groups of first threaded rods 303 in a threaded manner, the reflective lampshade 307 is arranged on one side, close to each other, of the four groups of connecting rods 305, the limiting sliding grooves 302 are formed in two sides and two ends of the inner side of the mounting frame 301, the first gears 304 are arranged on one side, far away from each other, of the four groups of first threaded rods 303, the first annular racks 306 are slidably arranged at the middle position of the outer side of the lampshade 1, and light rays of the light-emitting lamp panel 207 are collected.
As a preferable scheme of the present embodiment: an annular groove is formed in the middle position of the outer side of the mounting frame 301, and the first annular rack 306 slides in the annular groove, so that the first annular rack 306 rotates more stably.
As a preferable scheme of the present embodiment: the top of heat dissipation cover 201 inside is provided with the air intake, and the top of heat dissipation cover 201 is provided with the filter screen, and the air intake is located the filter screen under, filters the dust in the air.
As a preferable scheme of the present embodiment: the second annular rack 6 slides inside the annular chute 9, the second gear 4 is inside the gear groove 10, and the second annular rack 6 is meshed with the second gears 4, so that the two groups of second gears 4 rotate simultaneously.
As a preferable scheme of the present embodiment: a plurality of groups of heat dissipation grooves are formed in the middle position of the outer side of the lampshade 1, and heat is rapidly discharged.
As a preferable scheme of the present embodiment: the top of connecting rod 305 extends to the inside of spacing spout 302, slides each other between connecting rod 305 and the spacing spout 302, prevents that connecting rod 305 from appearing deflecting.
As a preferable scheme of the present embodiment: the first gear 304 is located above the first annular rack 306, and the first gear 304 is meshed with the first annular rack 306, and drives the first gear 304 to rotate.
As a preferable scheme of the present embodiment: the edge of the bottom of the lamp holder 208 is provided with a glass lampshade, and the edge of the bottom of the glass lampshade is arc-shaped to protect the lighting lamp holder 207.
In embodiment 1, as shown in fig. 1 and 4, when the lighting lamp panel 207 is powered on, the heat dissipation fan 202 works simultaneously, the heat dissipation fan 202 dissipates heat of the lighting lamp panel 207, the lighting lamp panel 207 can be blown, the second heat dissipation fins 206 and the lighting lamp panel 207 are fixedly connected with each other, heat generated by the lighting lamp panel 207 is transferred to the inside of the second heat dissipation fins 206, meanwhile, the first heat dissipation fins 203 can absorb heat in the heat dissipation cover 201 and transfer the heat to the outside of the heat dissipation cover 201, air flow generated by the heat dissipation fan 202 blows out heat around the second heat dissipation fins 206 out of the inside of the heat dissipation cover 201 through the plurality of groups of air outlet holes 204, so that the heat discharged by the heat dissipation fan 202 is larger than the heat generated by the lighting lamp panel 207, the purpose of rapid cooling is achieved in sequence, meanwhile, the filter screen at the top of the heat dissipation cover 201 can block dust carried in the air flow, the dust is prevented from entering the inside of the heat dissipation cover 201, and the dust is prevented from falling outside of the lighting lamp panel 207.
In embodiment 2, as shown in fig. 5-6, when fine operation is performed, a sufficient illumination environment is required, at this time, the first annular rack 306 can be rotated, the first annular rack 306 drives the first gear 304 meshed with the first annular rack, at this time, the first gear 304 drives the first threaded rod 303 to rotate, the first threaded rod 303 drives the connecting rod 305 to slide in the limiting chute 302 under the action of the threads, the connecting rod 305 drives the reflecting lamp covers 307 to approach towards the middle, finally, four groups of reflecting lamp covers 307 form a finished lamp cover and are clamped on the lower bottom surface of the lamp holder 208, and light generated by the illuminating lamp plate 207 is collected to form a light beam with stronger light, so that fine processing of operators is facilitated.
Working principle: when the lamp panel 207 is powered on, the heat dissipation fan 202 is simultaneously operated, the heat dissipation fan 202 dissipates heat of the lamp panel 207, the lamp panel 207 can be blown, the second heat dissipation fins 206 and the lamp panel 207 are fixedly connected with each other, heat generated by the lamp panel 207 is transferred to the inside of the second heat dissipation fins 206, meanwhile, the first heat dissipation fins 203 can absorb the heat in the heat dissipation cover 201 and transfer the heat to the outside of the heat dissipation cover 201, and air flow generated by the lamp panel 207 blows the heat around the second heat dissipation fins 206 out of the inside of the heat dissipation cover 201 through the plurality of groups of air outlet holes 204.
Simultaneously can, the during operation carries out simple regulation through adjusting the height of light board 207, drive second annular rack 6 through rotatory rotation ring 5 and rotate, second annular rack 6 carries out intermeshing with second gear 4, drive two sets of second threaded rods 8 and rotate, the effect that two sets of second threaded rods 8 pass through the screw drives connecting block 7 and reciprocate, thereby finally drive light board 207 and remove, can accomodate the inside to lamp shade 1 with light board 207 when using, reduce the damage of light board 207, not only can adjust the light that light board 207 produced to comfortable state, can prevent the unexpected contact of operating personnel and the scald that causes simultaneously.
When fine operation is carried out, the environment with sufficient illumination is needed, at this moment, the first annular rack 306 can be rotated, the first annular rack 306 drives the first gear 304 which is meshed with the first annular rack, at this moment, the first gear 304 simultaneously drives the first threaded rod 303 to rotate, the light reflecting lamp shades 307 are driven to be close to the middle through the connecting rod 305, finally, four groups of light reflecting lamp shades 307 form a finished lamp shade, light generated by the light emitting lamp panels 207 is collected, a light beam with stronger light is formed, and fine processing of operators is facilitated.
Finally, it should be noted that the above description is only for illustrating the technical solution of the present invention, and not for limiting the scope of the present invention, and that the simple modification and equivalent substitution of the technical solution of the present invention can be made by those skilled in the art without departing from the spirit and scope of the technical solution of the present invention.
Claims (8)
1. A embedded movable illumination lamps and lanterns for jewelry finish machining, including lamp shade (1), its characterized in that: the LED lamp shade is characterized in that second threaded rods (8) are arranged on two sides of the top of the inside of the lamp shade (1), a second gear (4) is arranged on the top of the outer side of the second threaded rods (8), connecting blocks (7) are arranged at the bottoms of the outer sides of the second threaded rods (8), a radiating component (2) is arranged on one side, close to each other, of each connecting block (7), a rotary ring (5) is sleeved on the top of the outer side of the lamp shade (1), a second annular rack (6) is arranged at the middle position of the inner side of the rotary ring (5), a gear groove (10) is formed in the top of the two sides of the inside of the lamp shade (1), an annular sliding groove (9) is formed in the top of the outer side of the lamp shade (1), and a light focusing component (3) is arranged at the bottom of the outer side of the lamp shade (1).
The heat radiation assembly (2) comprises a heat radiation cover (201), a heat radiation fan (202), first heat radiation fins (203), air outlet holes (204), openings (205), second heat radiation fins (206), a lamp plate (207) and lamp holders (208), wherein the heat radiation cover (201) is positioned on one side, close to each other, of two groups of connecting blocks (7), the top of two ends inside the heat radiation cover (201) is provided with the heat radiation fan (202), the bottom outside the heat radiation cover (201) is provided with a plurality of groups of first heat radiation fins (203), the bottom of the heat radiation cover (201) is provided with the lamp holders (208), the outer sides of the lamp holders (208) are uniformly provided with a plurality of groups of air outlet holes (204), the middle position of the bottom of the lamp holders (208) is provided with the openings (205), two sides of the bottom of the lamp holders (208) are provided with the lamp plate (207), and the top of the lamp plate (207) is provided with the second heat radiation fins (206).
The light focusing assembly (3) comprises a mounting frame (301), a limiting sliding groove (302), a first threaded rod (303), a first gear (304), a connecting rod (305), a first annular rack (306) and a light reflecting lampshade (307), wherein the mounting frame (301) is positioned at the bottom of the outer side of the lampshade (1), four groups of first threaded rods (303) are uniformly arranged at the top of the inner side of the mounting frame (301), the outer sides of the first threaded rods (303) are in threaded connection with the connecting rod (305), one sides of the connecting rods (305) close to each other are provided with the light reflecting lampshade (307), two sides and two ends of the inner side of the mounting frame (301) are provided with the limiting sliding groove (302), one sides of the four groups of the first threaded rods (303) away from each other are provided with the first gear (304), the middle position of the outer side of the lampshade (1) is provided with the first annular rack (306) in a sliding mode,
wherein, during operation, the second annular rack (6) is driven to rotate by rotating the rotary ring (5), the second annular rack (6) is meshed with the second gear (4) to drive the two groups of second threaded rods (8) to rotate, the two groups of second threaded rods (8) drive the connecting block (7) to move up and down under the action of the threads, thereby finally driving the illuminating lamp plate (207) to move,
wherein the second radiating fin (206) and the illuminating lamp plate (207) are fixedly connected with each other, the heat generated by the illuminating lamp plate (207) is transferred to the inside of the second radiating fin (206), meanwhile, the first radiating fin (203) absorbs the heat in the heat radiating cover (201) and transfers the heat to the outside of the heat radiating cover (201), the air flow generated by the heat radiating fan (202) blows the heat around the second radiating fin (206) out of the inside of the heat radiating cover (201) through a plurality of groups of air outlet holes (204), and
when fine operation is carried out, the first annular rack (306) is rotated, the first annular rack (306) drives the first gear (304) which is meshed with the first annular rack, at the moment, the first gear (304) simultaneously drives the first threaded rod (303) to rotate, the first threaded rod (303) drives the connecting rod (305) to slide in the limiting chute (302) under the action of threads, the connecting rod (305) drives the reflecting lamp covers (307) to approach towards the middle, finally, the four groups of reflecting lamp covers (307) form a finished lamp cover and are clamped on the lower bottom surface of the lamp holder (208), and light generated by the illuminating lamp plate (207) is collected.
2. An in-line removable light fixture for jewelry finishing as claimed in claim 1, wherein: an annular groove is formed in the middle position of the outer side of the mounting frame (301), and the first annular rack (306) is located in the annular groove and slides.
3. An in-line removable light fixture for jewelry finishing as claimed in claim 2, wherein: the top of heat dissipation cover (201) inside is provided with the air intake, the top of heat dissipation cover (201) is provided with the filter screen, and the air intake is located under the filter screen.
4. An in-line removable light fixture for jewelry finishing as claimed in claim 1, wherein: the second annular rack (6) is located in the annular chute (9) and slides, the second gear (4) is located in the gear groove (10), and the second annular rack (6) is meshed with the second gear (4).
5. An in-line removable light fixture for jewelry finishing as claimed in claim 1, wherein: a plurality of groups of heat dissipation grooves are formed in the middle position of the outer side of the lampshade (1).
6. A recessed mobile lighting fixture for jewelry finishing as claimed in claim 3, wherein: the top of the connecting rod (305) extends to the inside of the limit chute (302), and the connecting rod (305) and the limit chute (302) slide mutually.
7. A recessed mobile lighting fixture for jewelry finishing as claimed in claim 3, wherein: the first gear (304) is located above the first annular rack (306), and the first gear (304) and the first annular rack (306) are meshed with each other.
8. An in-line removable light fixture for jewelry finishing as claimed in claim 2, wherein: the edge of the bottom of the lamp holder (208) is provided with a glass lampshade, and the edge of the bottom of the glass lampshade is arc-shaped.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211476462.1A CN115854306B (en) | 2022-11-23 | 2022-11-23 | Embedded movable lighting lamp for jewelry finishing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211476462.1A CN115854306B (en) | 2022-11-23 | 2022-11-23 | Embedded movable lighting lamp for jewelry finishing |
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| Publication Number | Publication Date |
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| CN115854306A CN115854306A (en) | 2023-03-28 |
| CN115854306B true CN115854306B (en) | 2023-08-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202211476462.1A Active CN115854306B (en) | 2022-11-23 | 2022-11-23 | Embedded movable lighting lamp for jewelry finishing |
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| CN216202733U (en) * | 2021-08-24 | 2022-04-05 | 吕辉 | Tunnel engineering measurement's light |
| WO2022160884A1 (en) * | 2021-01-29 | 2022-08-04 | 浙江合兴船业有限公司 | Emergency lighting device of container ship that is controlled on basis of internet |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2010086713A (en) * | 2008-09-30 | 2010-04-15 | Toshiba Lighting & Technology Corp | Bulb-type lamp |
| KR20120016848A (en) * | 2010-08-17 | 2012-02-27 | (주)에스디엠 | Medical lighting apparatus |
| KR101003508B1 (en) * | 2010-08-25 | 2010-12-29 | 쓰리아이전기 주식회사 | Lighting apparatus with reflecting cover adjusted irradiation range |
| KR101369722B1 (en) * | 2012-03-30 | 2014-03-06 | 케이엘전기(주) | Lighting device |
| US10145551B2 (en) * | 2015-04-15 | 2018-12-04 | Titan LED, Inc. | LED lamp with active chamber cooling |
| CN212961060U (en) * | 2020-06-16 | 2021-04-13 | 怀来县金帆机械制造有限公司 | Shell for traffic and transportation illumination |
| CN112413540A (en) * | 2020-12-07 | 2021-02-26 | 常州市金流明光电科技有限公司 | Adjustable reflecting cover for plant illuminating lamp |
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- 2022-11-23 CN CN202211476462.1A patent/CN115854306B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022160884A1 (en) * | 2021-01-29 | 2022-08-04 | 浙江合兴船业有限公司 | Emergency lighting device of container ship that is controlled on basis of internet |
| CN216202733U (en) * | 2021-08-24 | 2022-04-05 | 吕辉 | Tunnel engineering measurement's light |
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