An energy-saving subway lighting device that is easy to hang
By precisely aligning the suspension components and suspension positioning components, and combining them with infrared sensor control, the problem of unstable suspension in energy-saving subway lighting equipment has been solved, achieving efficient and precise suspension and energy-saving lighting.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-24
- Publication Date
- 2026-03-13
AI Technical Summary
When existing energy-saving subway lighting equipment is used in a suspended manner, the bolts are prone to loosening, making it difficult to install efficiently and accurately, which leads to inconvenience in use.
It employs a precision docking suspension assembly, a suspension positioning assembly, and an internal docking assembly. It achieves efficient and precise suspension through components such as a miniature electric cylinder, a reduction motor, and a pressure sensor, and combines an infrared sensor to control the brightness of the LED lamp head.
This achieves efficient and precise suspension installation of lighting devices, reduces suspension instability, and improves ease of use and energy efficiency.
Smart Images

Figure CN119826145B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of suspended lighting technology, and more specifically, to an energy-saving subway lighting device that is easy to suspend. Background Technology
[0002] The suspended energy-saving subway lighting equipment is mainly suspended from the ceiling inside the subway passage. Infrared sensor-based energy-saving lighting uses infrared sensors to detect human or object activity in the surrounding environment, intelligently controlling the switching on and off of the lights and their brightness. When no one is in the sensing area, the lighting equipment automatically turns off or reduces its brightness, effectively saving energy. Compared to traditional continuous lighting, this intelligent control method significantly reduces the subway's energy consumption.
[0003] In existing publicly available literature, patent publication number CN215569850U discloses a subway electromechanical maintenance lighting device. This technology utilizes a support rod with a trapezoidal groove on its inner surface and a square groove on the surface of a housing. A rotating shaft is rotatably mounted on the inner wall of the square groove, and a foot pedal is fixedly mounted on the surface of the rotating shaft. A clamp is fixedly mounted on one end of the foot pedal inside the housing. This invention, through the lifting support column, facilitates the illumination and maintenance of electromechanical equipment at different heights. However, this technology has the following drawbacks;
[0004] When energy-saving subway lighting equipment is used in a suspended manner, it needs to be fixed to the hanging lamp holder with bolts. However, when the subway runs in the underground tunnel, the bolts are very easy to loosen. Moreover, it is difficult to achieve efficient and precise hanging installation by rotating each bolt, which is inconvenient for suspended use. Therefore, there is a need for an energy-saving subway lighting equipment that is easy to hang. Summary of the Invention
[0005] To overcome the above-mentioned defects of the prior art, the present invention provides the following technical solution: an energy-saving subway lighting device that is easy to suspend, including a suspension slot frame, a guide column fixedly connected to the outer wall of the suspension slot frame, a sleeve slider slidably connected to the outer wall of the guide column, and a precision docking suspension assembly installed on the outer wall of the sleeve slider; the precision docking suspension assembly includes a push block fixedly installed on the outer wall of the sleeve slider, and a miniature electric cylinder is provided on one side of the push block, the output end of the miniature electric cylinder is fixedly connected to the push block, and the miniature electric cylinder is fixedly connected to the guide column.
[0006] An L-shaped frame plate is fixedly connected to one side of the sliding block. A screw is rotatably connected to the inner wall of the L-shaped frame plate. A reduction motor is fixedly installed at the top of the L-shaped frame plate. The reduction motor drives the screw to rotate. A sleeve block is threadedly connected to the outer wall of the screw. The sleeve block is slidably connected to the L-shaped frame plate. A concave insert is fixedly connected to one side of the sleeve block. A suspension strip is provided on one side of the concave insert. The outer wall of the suspension strip is inserted into the inner wall of the suspension slot. A suspension positioning component is installed on the outer wall of the suspension strip. An internal docking component is provided on one side of the inner wall of the concave insert.
[0007] Preferably, a gap is provided between the reduction motor and the guide post, and the vertical cross-section of the L-shaped frame plate is L-shaped. The output end of the reduction motor is rotatably connected to the L-shaped frame plate, and the output end of the reduction motor is fixedly connected to the screw; the inner wall of the L-shaped frame plate is a smooth surface. The inner wall of the sleeve slider and the outer wall of the guide post are both smooth surfaces, and the miniature electric cylinder is used to push the push block to move.
[0008] In use, the miniature electric cylinder pushes the push block to the left, which in turn moves the sleeve slider to the left. The L-shaped frame plate drives the screw to move the sleeve block to the left, and the concave insert moves to the left along the outer wall of the suspension strip. The screw is driven to rotate by the reduction motor, and the screw moves the sleeve block upward under the action of the thread transmission force. The concave insert moves the limit pressure frame upward. When the pressure sensor detects the pressure value, the reduction motor is turned off by the controller.
[0009] Preferably, the suspension positioning assembly includes a limiting pressure frame fixedly installed on the outer wall of the suspension insert; a pressure sensor is provided above the limiting pressure frame, the pressure sensor is fixedly connected to the suspension slot, and a suspension base is fixedly connected to the top of the suspension slot, the suspension base having multiple mounting holes inside; a lighting fixture is fixedly installed at the bottom of the suspension insert, an infrared sensor is fixedly connected to the bottom of the lighting fixture, and multiple LED lamp heads are provided outside the infrared sensor, each of the multiple LED lamp heads being fixedly connected to the lighting fixture; a controller is fixedly installed on one side of the L-shaped frame. The lower surface of the suspension slot and the lower surface of the pressure sensor are on the same horizontal plane, and the cross-sectional shape of the suspension insert is rectangular. The multiple LED lamp heads are arranged in a circular, equidistant distribution, and the outer wall of the lighting fixture is a smooth surface.
[0010] In use, the suspension bracket is connected to the top of the subway tunnel and fixed to the top of the subway tunnel. The suspension insert is inserted into the inside of the suspension slot frame and positioned inside the suspension slot frame by the suspension insert. The lighting fixture supports the infrared sensor and supports multiple LED lamp heads at the same time.
[0011] Preferably, the internal docking assembly includes a sliding frame, a linkage motor, a tightening screw, a threaded sleeve, a linkage column, and a displacement motor; the sliding frame is fixed to one side of the inner wall of the concave insert, the linkage motor is fixedly installed on the inner wall of the sliding frame, the tightening screw is fixedly located on the output end of the linkage motor, the threaded sleeve is threadedly connected to the outer wall of the tightening screw, the threaded sleeve is slidably connected to the sliding frame, the linkage column is fixed to one side of the threaded sleeve, the linkage column is slidably connected to the sliding frame, and the displacement motor is fixedly installed at one end of the linkage column; the internal docking assembly also includes a rotating rod, a rotating ring, an insert block, an insert groove, and a proximity sensor;
[0012] The rotating rod is fixedly mounted on the output end of the positioner motor. The rotating ring is fixedly connected to the outer wall of the rotating rod. The embedded block is fixedly located on the outer wall of the rotating ring. The embedded groove is formed on the inner wall of the suspension strip. The proximity sensor is located above the embedded groove and is fixedly connected to the suspension strip. The linkage motor drives the tightening screw to rotate, and the tightening screw is rotatably connected to the slide frame. The vertical cross-sectional shape of the embedded groove is rectangular, and the vertical cross-sectional shape of the rotating rod is circular.
[0013] In use, the tightening screw drives the threaded sleeve block to move to the left under the force transmitted through the thread, and the linkage column moves to the left along the inner wall of the slide frame. The positioner motor drives the rotating rod to move the rotating ring to the left, and the insert block is inserted into the suspension strip. When the proximity sensor detects the movement, the controller shuts off the linkage motor, and the positioner motor drives the rotating rod to rotate 90 degrees clockwise to complete the precise internal docking operation.
[0014] The technical effects and advantages of this invention are as follows:
[0015] 1. This invention achieves precise alignment of the suspension assembly. A miniature electric cylinder pushes the push block to the left, which in turn moves the sleeve slider to the left. The L-shaped frame moves the screw, causing the sleeve block to move to the left. The concave insert moves to the left along the outer wall of the suspension insert. A reduction motor drives the screw to rotate, causing the sleeve block to move the concave insert upward. The concave insert moves the limiting pressure frame upward. When the pressure sensor detects a pressure value, the controller shuts off the reduction motor. This allows for efficient and precise suspension installation at a specified position, making the lighting device more convenient to use.
[0016] 2. This invention uses a suspension positioning component to fix the suspension seat to the top of the subway tunnel. The suspension seat supports the suspension slot frame, and the suspension insert is inserted into the suspension slot frame. The suspension insert is positioned and connected inside the suspension slot frame. The lighting fixture supports the infrared sensor and supports multiple LED lamp heads at the same time to achieve positioning and insertion, thereby achieving efficient and precise suspension installation.
[0017] 3. This invention uses an internal docking assembly. When the linkage motor is started, it drives the tightening screw to rotate. The threaded sleeve block moves to the left under the action of the thread transmission force. The linkage column moves to the left along the inner wall of the slide frame. The displacement motor drives the rotating rod to move the rotating ring to the left. The embedded block is inserted into the suspension insert. When the proximity sensor detects it, the embedded block docks with the embedded groove. The displacement motor drives the rotating rod to rotate 90 degrees clockwise. The embedded block enters the embedded groove, completing the internal precise docking operation.
[0018] The interaction of these multiple actions first causes the suspension strip to be inserted into the suspension slot, then the concave block moves to the left along the outer wall of the suspension strip, and finally the insert block is inserted into the suspension strip, causing the concave block to move the limiting pressure frame upward. In summary, efficient and precise suspension installation can be achieved at a specified position, making the lighting device more convenient to use. Attached Figure Description
[0019] Figure 1 This is a schematic diagram of the overall structure of the energy-saving subway lighting device that is easy to hang according to the present invention.
[0020] Figure 2 This is a partial structural diagram of the connection between the suspension bracket and the guide column of the present invention.
[0021] Figure 3 This is a schematic diagram of a partial structure of the screw cut-off part of the present invention.
[0022] Figure 4 This is a partial structural diagram showing the connection between the infrared sensor and the lighting fixture of the present invention.
[0023] Figure 5 This is a schematic diagram of a partial structure of the vertical cross-section of the suspension insert of the present invention.
[0024] Figure 6 This is a partial structural diagram of the internal docking assembly of the present invention.
[0025] Figure 7 This is a schematic diagram of a partial structure of the linkage column cutoff in this invention.
[0026] Figure 8 For the present invention Figure 5 Enlarged structural diagram at point A in the middle.
[0027] The attached figures are labeled as follows: 1. Suspension slot; 2. Guide post; 3. Sleeve slider; 4. Push block; 5. Miniature electric cylinder; 6. L-shaped frame plate; 7. Screw; 8. Gear motor; 9. Sleeve block; 10. Concave insert block; 11. Suspension insert; 12. Limiting pressure frame; 13. Pressure sensor; 14. Suspension seat; 15. Lighting lamp holder; 16. LED lamp head; 17. Infrared sensor; 18. Controller; 19. Slide frame; 20. Linkage motor; 21. Tightening screw; 22. Threaded sleeve block; 23. Linkage post; 24. Positioning motor; 25. Rotating rod; 26. Rotary ring; 27. Embedded block; 28. Embedded groove; 29. Proximity sensor; 30. Mounting hole. Detailed Implementation
[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0029] As attached Figure 1 - Appendix Figure 8 The present invention relates to an energy-saving subway lighting device that is easy to suspend. The device is equipped with a precision docking suspension component, a suspension positioning component, and an internal docking component. The arrangement of each component enables efficient and precise suspension installation at a specified position, making the lighting device more convenient to use. The specific structural settings of each component are as follows.
[0030] In this technical solution, as shown in the appendix Figure 1 - Appendix Figure 3 As shown, a guide post 2 is fixedly connected to the outer wall of the suspension bracket 1, and a sleeve slider 3 is slidably connected to the outer wall of the guide post 2. A precision docking suspension assembly is installed on the outer wall of the sleeve slider 3. The precision docking suspension assembly includes a push block 4 fixedly installed on the outer wall of the sleeve slider 3, and a micro electric cylinder 5 is provided on one side of the push block 4. The output end of the micro electric cylinder 5 is fixedly connected to the push block 4, and the micro electric cylinder 5 is fixedly connected to the guide post 2. An L-shaped frame plate 6 is fixedly connected to one side of the sleeve slider 3.
[0031] A screw 7 is rotatably connected to the inner wall of the L-shaped frame plate 6. A reduction motor 8 is fixedly installed at the top of the L-shaped frame plate 6. The reduction motor 8 is used to drive the screw 7 to rotate. A sleeve block 9 is threadedly connected to the outer wall of the screw 7. The sleeve block 9 is slidably connected to the L-shaped frame plate 6. A concave insert block 10 is fixedly connected to one side of the sleeve block 9. A suspension strip 11 is provided on one side of the concave insert block 10. The outer wall of the suspension strip 11 is inserted into the inner wall of the suspension slot frame 1. A suspension positioning component is installed on the outer wall of the suspension strip 11. An internal docking component is provided on one side of the inner wall of the concave insert block 10.
[0032] In this technical solution, as shown in the appendix Figure 1 - Appendix Figure 4 As shown, the suspension positioning assembly includes a limiting pressure frame 12 fixedly installed on the outer wall of the suspension insert 11; a pressure sensor 13 is provided above the limiting pressure frame 12, and the pressure sensor 13 is fixedly connected to the suspension slot frame 1, and a suspension seat 14 is fixedly connected to the top of the suspension slot frame 1, and multiple mounting holes 30 are opened inside the suspension seat 14; a lighting lamp holder 15 is fixedly installed at the bottom of the suspension insert 11, and an infrared sensor 17 is fixedly connected to the bottom of the lighting lamp holder 15, and multiple LED lamp heads 16 are provided outside the infrared sensor 17, and the multiple LED lamp heads 16 are all fixedly connected to the lighting lamp holder 15; a controller 18 is fixedly installed on one side of the L-shaped frame plate 6.
[0033] In this technical solution, as shown in the appendix Figure 5 - Appendix Figure 8 As shown, the internal docking assembly includes a sliding frame 19, a linkage motor 20, a tightening screw 21, a threaded sleeve 22, a linkage column 23, and a displacement motor 24. The sliding frame 19 is fixed to one side of the inner wall of the concave insert 10. The linkage motor 20 is fixedly installed on the inner wall of the sliding frame 19. The tightening screw 21 is fixedly located on the output end of the linkage motor 20. The threaded sleeve 22 is threadedly connected to the outer wall of the tightening screw 21, and the threaded sleeve 22 is slidably connected to the sliding frame 19. The linkage column 23 is fixed to one side of the threaded sleeve 22, and the linkage column 23 is slidably connected to the sliding frame 19. The displacement motor 24 is fixedly installed at one end of the linkage column 23. The internal docking assembly also includes a rotating rod 25, a rotating ring 26, an insert block 27, an insert groove 28, and a proximity sensor 29.
[0034] A rotating rod 25 is fixedly mounted on the output end of a positioner motor 24. A rotating ring 26 is fixedly connected to the outer wall of the rotating rod 25. An embedded block 27 is fixedly located on the outer wall of the rotating ring 26. An embedded groove 28 is formed on the inner wall of a suspension insert 11. A proximity sensor 29 is located above the embedded groove 28 and is fixedly connected to the suspension insert 11. A linkage motor 20 drives a tightening screw 21 to rotate, and the tightening screw 21 is rotatably connected to a sliding frame 19. The vertical cross-sectional shape of the embedded groove 28 is rectangular, and the vertical cross-sectional shape of the rotating rod 25 is circular.
[0035] The working principle of this invention's easy-to-hang energy-saving subway lighting device is as follows:
[0036] Step 1: During the suspension positioning and installation, the suspension bracket 14 is aligned with the top of the subway tunnel. Expansion bolts are inserted through the mounting holes 30 to fix the suspension bracket 14 to the top of the subway tunnel. The suspension bracket 14 supports the suspension slot frame 1. Then, the suspension insert 11 is inserted into the suspension slot frame 1. The suspension insert 11 is positioned and aligned with the inside of the suspension slot frame 1. The suspension insert 11 is connected to the lighting fixture 15. The lighting fixture 15 supports the infrared sensor 17 and also supports multiple LED lamp heads 16.
[0037] Step 2: During precise docking and suspension, controller 18 pushes micro electric cylinder 5, micro electric cylinder 5 pushes push block 4 to move left, push block 4 drives sleeve slider 3 to move left, sleeve slider 3 drives L-shaped frame plate 6 to move left, L-shaped frame plate 6 drives screw 7 to move sleeve block 9 to move left, sleeve block 9 drives concave insert block 10 to move left, concave insert block 10 moves left along the outer wall of suspension insert 11 and inserts, so that pressure sensor 13 is located at the upper surface of limit pressure frame 12, and slide frame 19 is inserted into the inside of suspension insert 11.
[0038] Step 3: During internal docking, the controller 18 starts the linkage motor 20, which drives the tightening screw 21 to rotate. The tightening screw 21 causes the threaded sleeve block 22 to move to the left under the action of the thread transmission force. The threaded sleeve block 22 causes the linkage column 23 to move to the left, and the linkage column 23 moves to the left along the inner wall of the slide frame 19. The linkage column 23 causes the displacement motor 24 to move to the left, which in turn causes the rotating rod 25 to move the rotating ring 26 to the left. The rotating ring 26 causes the insert block 27 to move to the left, and the insert block 27 is inserted into the suspension insert 11. The proximity sensor 29 senses the distance to the insert block 27. When the proximity sensor 29 detects the distance, the insert block 27 docks with the insert groove 28. The controller 18 shuts off the linkage motor 20 and simultaneously starts the displacement motor 24. The displacement motor 24 drives the rotating rod 25 to rotate 90 degrees clockwise, so that the insert block 27 enters the insert groove 28, completing the precise internal docking operation.
[0039] The screw 7 is driven to rotate by the reduction motor 8. The screw 7 drives the sleeve block 9 to move upward under the action of the thread transmission force. The sleeve block 9 drives the concave insert block 10 to move upward. The concave insert block 10 drives the limiting pressure frame 12 to move upward. The limiting pressure frame 12 presses upward at the bottom position of the pressure sensor 13. When the pressure sensor 13 senses the pressure value, the reduction motor 8 is turned off by the controller 18.
[0040] Step 4: When energy-saving lighting is being installed, if maintenance personnel pass under the infrared sensor 17 after the light is suspended, the infrared sensor 17 will detect the light and turn on multiple LED lamp heads 16, thus enabling the LED lamp heads 16 to perform lighting operations and achieve energy-saving lighting effects.
[0041] All contents not described in detail in the specification are existing technologies known to those skilled in the art, and the model parameters of each electrical appliance are not specifically limited; conventional equipment can be used. Electrical control components not mentioned in this technical solution are not shown in the figures because they are existing technologies, and will not be described here.
[0042] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. An energy-saving subway lighting device that is easy to suspend, comprising a suspension bracket (1), wherein a guide post (2) is fixedly connected to the outer wall of the suspension bracket (1), and a sliding block (3) is slidably connected to the outer wall of the guide post (2), characterized in that: The outer wall of the sleeve joint sliding block (3) is provided with a precise butt joint suspension assembly; The precise butt joint suspension assembly comprises a push block (4) fixedly installed on the outer wall of the sleeve joint sliding block (3), and one side of the push block (4) is provided with a micro electric cylinder (5), and the output end of the micro electric cylinder (5) is fixedly connected with the push block (4), and the micro electric cylinder (5) is fixedly connected with the guide column (2); One side of the sleeve joint sliding block (3) is fixedly connected with an L-shaped frame plate (6), the inner wall of the L-shaped frame plate (6) is rotatably connected with a screw rod (7), the top end of the L-shaped frame plate (6) is fixedly installed with a speed reducer motor (8), the speed reducer motor (8) is used for driving the screw rod (7) to rotate, the outer wall of the screw rod (7) is threadedly connected with a sleeve joint block (9), and the sleeve joint block (9) is slidably connected with the L-shaped frame plate (6); One side of the sleeve joint block (9) is fixedly connected with a concave insertion block (10), one side of the concave insertion block (10) is provided with a suspension insertion strip (11), and the outer wall of the suspension insertion strip (11) is inserted with the inner wall of the suspension groove frame (1). The outer wall of the suspension insertion strip (11) is provided with a suspension positioning assembly, and the suspension positioning assembly comprises a limiting pressing frame (12) fixedly installed on the outer wall of the suspension insertion strip (11). The upper side of the limiting pressing frame (12) is provided with a pressure sensor (13), the pressure sensor (13) is fixedly connected with the suspension groove frame (1), and the top end of the suspension groove frame (1) is fixedly connected with a suspension seat (14), and a plurality of mounting holes (30) are formed in the inside of the suspension seat (14). The bottom end of the suspension insertion strip (11) is fixedly installed with a lighting lamp holder (15), the bottom end of the lighting lamp holder (15) is fixedly connected with an infrared sensor (17), the outside of the infrared sensor (17) is provided with a plurality of LED lamp heads (16), and the plurality of LED lamp heads (16) are fixedly connected with the lighting lamp holder (15). One side of the L-shaped frame plate (6) is fixedly installed with a controller (18); One side of the inner wall of the concave insertion block (10) is provided with an internal butt joint assembly, and the internal butt joint assembly comprises a sliding frame (19), a linkage motor (20), a tightening screw rod (21), a threaded sleeve block (22), a linkage column (23), a displacement motor (24), a rotating rod (25), a rotating ring (26), an embedded block (27), an embedded groove (28), and a proximity sensor (29).
2. The energy efficient suspended metro lighting device of claim 1, wherein: The gap is provided between the speed reducer motor (8) and the guide column (2), and the vertical section shape of the L-shaped frame plate (6) is L-shaped.
3. The energy efficient suspended metro lighting device of claim 1, wherein: The output end of the speed reducer motor (8) is rotatably connected with the L-shaped frame plate (6), and the output end of the speed reducer motor (8) is fixedly connected with the screw rod (7); The inner wall of the L-shaped frame plate (6) is a smooth surface.
4. The energy efficient suspended metro lighting device of claim 1, wherein: The inner wall of the sleeve joint sliding block (3) and the outer wall of the guide column (2) are both smooth surfaces, and the micro electric cylinder (5) is used for pushing the push block (4) to move.
5. The energy efficient suspended metro lighting device of claim 1, wherein: The lower surface of the suspension groove frame (1) and the lower surface of the pressure sensor (13) are in the same horizontal plane, and the cross section shape of the suspension insertion strip (11) is rectangular.
6. The energy efficient suspended metro lighting device of claim 1, wherein: A plurality of said LED lamp holders (16) are arranged in a circular ring equidistantly, and the outer wall of said lighting lamp holder (15) is smooth.
7. The energy efficient suspended metro lighting device of claim 1, wherein: Said sliding frame (19) is fixed on one side of the inner wall of the concave plug (10), said linkage motor (20) is fixedly installed on the inner wall of the sliding frame (19), said tightening screw rod (21) is fixed on the output end of the linkage motor (20), said threaded sleeve block (22) is threadedly connected on the outer wall of the tightening screw rod (21), and said threaded sleeve block (22) is slidingly connected with the sliding frame (19), said linkage column (23) is fixed on one side of the threaded sleeve block (22), and said linkage column (23) is slidingly connected with the sliding frame (19), said displacement motor (24) is fixedly installed on one end of the linkage column (23); Said rotating rod (25) is fixedly arranged on the output end of the displacement motor (24), said rotating ring (26) is fixedly connected on the outer wall of the rotating rod (25), said embedded block (27) is fixed on the outer wall of the rotating ring (26), said embedded groove (28) is arranged on the inner wall of the hanging plug strip (11), said proximity sensor (29) is arranged above the embedded groove (28), and said proximity sensor (29) is fixedly connected with the hanging plug strip (11).
8. The energy efficient suspended metro lighting device of claim 7, wherein: Said linkage motor (20) is used for driving the rotation of the tightening screw rod (21), and said tightening screw rod (21) is rotationally connected with the sliding frame (19).
9. The energy efficient suspended metro lighting device of claim 7, wherein: The vertical section shape of said embedded groove (28) is rectangular, and the vertical section shape of said rotating rod (25) is circular.
Citation Information
Patent Citations
Metro electromechanical maintenance lighting device
CN215569850U
Subway top suspension device
CN109630947A
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CN211011124U