Elevator light curtain with door opening warning function

Abstract

This invention belongs to the field of elevator light curtain technology and discloses an elevator light curtain with door opening and closing warning function. It includes a light curtain housing and positioning frames fixed at both ends. A groove is formed on the left side of the light curtain housing, and the light curtain body is connected inside the groove. Warning LEDs are installed on both sides of the light curtain body. A movable frame is fitted around the outside of the light curtain body. Limiting grooves are formed on the front and rear sides of the light curtain housing, and the movable frame slides in cooperation with the limiting grooves. This elevator light curtain with door opening and closing warning function completely changes the traditional "passive response" safety protection mode of light curtains through the design of multiple arrays of dual-color warning LEDs, constructing an active and efficient warning system. During the elevator door closing process, the high brightness and wide warning range of the dual-color flashing lights can clearly remind the elderly and children who move slowly, and can also effectively attract the attention of passengers focused on electronic devices, avoiding collisions or pinching accidents caused by delayed reaction.

Description

Technical Field

[0001] This invention relates to the field of elevator light curtain technology, specifically to an elevator light curtain with a door opening and closing warning function. Background Technology

[0002] As a core safety protection device in elevator door systems, elevator light curtains essentially form an invisible "safety barrier" through an infrared light emission and reception matrix, installed on both sides of the elevator car doors. During the elevator door closing process, if the light curtain detects a person or object blocking the light, it immediately sends a signal to the elevator control system, triggering the door operator to reverse and reopen the elevator doors. This fundamentally prevents accidents involving people or objects being trapped. It is a critical component mandated by modern elevator safety standards and directly relates to the personal safety of passengers and maintenance personnel.

[0003] With the surge in elevator ownership and the increasing service life of older elevators, the reliability and functionality requirements of light curtains are constantly being upgraded, and traditional light curtains can no longer adapt to complex usage scenarios.

[0004] However, existing elevator light curtains still have some problems in use: An elevator light curtain, as described in Chinese patent application number CN202420305818.3, includes a light curtain mechanism and a cleaning mechanism. The cleaning mechanism is fixedly connected to the light curtain mechanism. The cleaning mechanism includes a power box, a motor is fixedly connected to the back of the inner wall of the power box, a drive wheel is fixedly connected to the output end of the motor, a drive belt is driven to the surface of the drive wheel, a sliding column is fixedly connected to the bottom of the inner wall of the power box, the top of the sliding column is fixedly connected to the inner wall of the power box, a drive slider is sleeved on the surface of the sliding column, and a return spring is sleeved on the surface of the sliding column.

[0005] To prevent dust from affecting the sensitivity and safety of elevator light curtains during use, existing light curtain cleaning structures are equipped with cleaning blocks. However, these existing cleaning structures rely on simple cleaning blocks for wiping. After repeated use, the surface of the cleaning structure becomes contaminated, resulting in unsatisfactory cleaning effects during subsequent wiping. Furthermore, the dust on the surface of the cleaning blocks can cause secondary pollution.

[0006] To address the aforementioned issues, an innovative design was developed based on the existing elevator light curtain with door opening and closing warning functions. Summary of the Invention

[0007] The purpose of this invention is to provide an elevator light curtain with a door opening and closing warning function, in order to solve the problem mentioned in the background art that the surface of the existing light curtain cleaning structure will be covered with dust during use, and the cleaning effect will be affected after repeated use, which will easily cause secondary pollution.

[0008] To achieve the above objectives, the present invention provides the following technical solution: an elevator light curtain with a door opening / closing warning function, comprising a light curtain housing and positioning frames fixed at both ends, wherein a groove is formed on the left side of the light curtain housing, and the light curtain body is connected inside the groove. Warning LEDs are installed on both sides of the light curtain body. A movable frame is fitted on the outside of the light curtain body. Limiting grooves are opened on the front and rear sides of the light curtain shell. The movable frame slides in conjunction with the limiting grooves. A transmission groove is opened on the right side of the light curtain housing, and a first rack is fixed inside the transmission groove. A lifting motor is connected to the right side of the movable frame, and a lifting gear is connected to the left shaft end of the lifting motor. The lifting gear meshes with the first rack. A rotating rod is connected to the inner wall of the left side of the movable frame, and a cleaning brush is connected to the middle of the rotating rod. An air guide shroud is fixed to the upper left side of the movable frame, and the lower end of the air guide shroud extends into the interior of the movable frame. An impeller is provided inside the air guide shroud.

[0009] Preferably, the warning LED beads are symmetrically distributed on the front and rear sides of the light curtain body, and the warning LED beads are distributed in an equidistant array.

[0010] By adopting the above technical solution and designing multiple arrays of warning LED beads, dual-color warning lights can be emitted. During the closing process of the elevator door, flashing dual-color lights are emitted simultaneously to achieve light door warning and improve safety.

[0011] Preferably, a slider is fixed to the inner wall of the right side of the movable frame, the slider extends into the transmission groove, and the slider slides into the transmission groove.

[0012] By adopting the above technical solution, through the cooperation of the slider and the transmission groove, and the inner wall of the movable frame and the limiting groove, a stable connection between the movable frame and the light curtain housing can be achieved, as well as the stability during lifting and sliding, thus preventing the movable frame from shifting during the lifting process.

[0013] Preferably, the lifting gear is disposed inside the slider, the slider has openings on both sides, the lifting gear extends to the outside of the openings, and the lifting gear meshes with the first rack. The inner walls of both ends of the limiting slide are fixed with touch switches, and the upper and lower sides of the movable frame are connected to touch plates, which are in contact with the touch switches.

[0014] Using the above technical solution, the lifting motor can drive the lifting gear to rotate. During the rotation of the lifting gear, it cooperates with the first rack and can drive the movable frame to rise and fall. During the rising and falling process, the movable frame can block the light curtain in stages, thereby realizing the detection of normal operation of the light curtain. At the same time, in order to avoid fault alarms caused by light curtain blocking, the contact with the touch switch is released during the rising and falling process of the movable frame, thereby interrupting the signal transmission of elevator door closing and fault alarm.

[0015] Preferably, the rear end of the rotating rod is connected to a first gear, the inner wall of the movable frame is rotatably connected to a transmission gear, and the transmission gear meshes with the first gear. The outer rear wall of the light curtain housing is fixed with a second rack, which meshes with the transmission gear.

[0016] By adopting the above technical solution, through the cooperation of the transmission gear and the second rack, the transmission gear can be driven to rotate during the lifting and lowering of the movable frame. When the transmission gear rotates, it cooperates with the first gear to drive the rotating rod and the cleaning brush to rotate synchronously. The cooperation between the transmission gear and the first gear increases the transmission ratio and accelerates the rotation of the cleaning brush.

[0017] Preferably, a guide cover is fixed to the inner wall of the left side of the movable frame, a cleaning block is slidably connected to the lower end of the guide cover, a reciprocating screw is connected to the middle of the cleaning block, the two ends of the reciprocating screw are rotatably connected to the movable frame, and a second gear is connected to the rear end of the reciprocating screw, which meshes with the first gear.

[0018] Preferably, the lower end of the cleaning block contacts the cleaning brush, and the lower end of the cleaning block has an array of square protrusions. The cleaning brush is a flexible microfiber brush.

[0019] By adopting the above technical solution, through the cooperation of the second gear and the first gear, the second gear and the reciprocating screw are simultaneously driven to rotate when the first gear drives the cleaning brush to rotate. The rotation of the reciprocating screw can drive the cleaning block to move back and forth, and the cleaning block is in contact with the cleaning brush. During the cleaning process of the cleaning brush cleaning the light curtain body, the reciprocating motion of the cleaning block collides with the brush bristles, thereby cleaning the dust adhering to the brush bristles and avoiding secondary pollution of the light curtain body caused by excessive dust adhering to the brush bristles. The guide cover and the cleaning block slide together, which can improve the sliding stability of the cleaning block. At the same time, the upper end of the guide cover is designed with a slope, which can provide guidance for subsequent airflow cleaning.

[0020] Preferably, a rotating shaft is fixed in the middle of the impeller, the rotating shaft is rotatably connected to the inner wall of the air guide shroud, the front end of the rotating shaft passes through the outside of the air guide shroud, a second motor is fixed in the front end of the air guide shroud, and the shaft end of the second motor is connected to the rotating shaft.

[0021] Using the above technical solution, the second motor can drive the rotating shaft and impeller to rotate synchronously. When the impeller rotates, it can drive the airflow to flow inside the air guide hood and guide it to the inside of the movable frame through the air guide hood. The airflow blows towards the surface of the light curtain body. The airflow blows from top to bottom, and the exhaust port of the air guide hood is above the cleaning brush, which can blow the dust floating after the cleaning brush is cleaned downwards, avoiding dust floating in the air and causing pollution to the surface of the light curtain again.

[0022] Preferably, the impeller is adapted to the inner wall of the air guide shroud, an air inlet is opened on the left side of the air guide shroud, the air inlets are distributed in an equidistant array, and a filter screen is provided on the outer cover of the air inlet.

[0023] By adopting the above technical solution and through the design of the filter screen, the air intake of the air guide shroud can be filtered, preventing dust from being sucked up and blown onto the surface of the light curtain when the impeller rotates, thus ensuring the thorough cleaning of the light curtain.

[0024] Compared with existing technologies, the advantages of this invention are as follows: This elevator light curtain with door opening and closing warning function, through its design of multiple arrays of dual-color warning LEDs, completely changes the traditional "passive response" safety protection mode of light curtains, constructing an active and efficient warning system. During the elevator door closing process, the dual-color flashing lights are bright and have a wide warning range, clearly reminding the elderly and children who move slowly, and effectively attracting the attention of passengers focused on electronic devices, avoiding collisions or pinching accidents caused by delayed reactions. At the same time, the dual-color lights still have excellent visibility in both bright and dim environments, greatly improving the safety redundancy in different scenarios and providing more comprehensive protection for passenger safety.

[0025] 1. This light curtain innovatively achieves a combination of self-cleaning functions, including rotating cleaning brushes, reciprocating dust removal by cleaning blocks, and directional airflow. This effectively solves the problem of traditional light curtains being easily contaminated by dust. When the movable frame is raised and lowered, the transmission gear and the second rack work together to drive the cleaning brush to rotate at high speed, which can quickly remove floating dust and debris from the surface of the light curtain body. At the same time, the first gear drives the reciprocating screw to rotate, causing the cleaning block to move back and forth along the guide cover. The cleaning block collidees with the brush bristles through the square protrusion at the lower end, thoroughly cleaning the dust adhering to the bristles and avoiding secondary pollution. In addition, the directional airflow generated by the rotating impeller inside the air guide cover can blow the floating dust after cleaning downwards away from the surface of the light curtain. Combined with the air intake filter, the air intake air is filtered to ensure thorough cleaning, reduce property maintenance costs, and avoid the risk of accidentally touching parts during manual cleaning. This ensures the long-term detection accuracy of the light curtain and prevents elevator mis-triggering or missed detection problems caused by "false obstruction". 2. The light curtain is designed to drive the movable frame to rise and fall via a lifting motor, enabling timed detection of local areas of the light curtain: the movable frame partially blocks the light curtain during the rising and falling process, which can quickly verify the effectiveness of the infrared tubes in each area and promptly detect hidden safety vulnerabilities caused by aging or contamination; at the same time, the movable frame touch plate and the limit slide touch switch work together to interrupt the elevator door closing and fault alarm signal transmission during detection, avoiding elevator abnormalities during the detection process. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the light curtain housing and positioning frame structure of the present invention; Figure 3 This is a schematic diagram of the light curtain body and warning lamp beads of the present invention; Figure 4This is a schematic diagram of the light curtain housing and the first rack structure of the present invention; Figure 5 This is a schematic diagram of the lifting gear and the first rack structure of the present invention; Figure 6 This is a schematic diagram of the shaft and impeller structure of the present invention; Figure 7 This is a schematic diagram of the first and second gear structures of the present invention; Figure 8 This is a schematic diagram of the rotating rod and cleaning brush structure of the present invention; Figure 9 This is a schematic diagram of the light curtain housing and movable frame structure of the present invention.

[0027] In the diagram: 1. Light curtain housing; 2. Positioning frame; 3. Light curtain body; 4. Warning light bead; 5. Movable frame; 6. Limiting slide groove; 7. Transmission groove; 8. First rack; 9. Lifting motor; 10. Lifting gear; 11. Touch plate; 12. Rotating rod; 13. Cleaning brush; 14. First gear; 15. Transmission gear; 16. Second rack; 17. Guide cover; 18. Reciprocating screw; 19. Cleaning block; 20. Second gear; 21. Air guide cover; 22. Rotating shaft; 23. Impeller; 24. Second motor; 25. Touch switch. 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] Example 1, please refer to Figure 1-9 This invention provides a technical solution: an elevator light curtain with door opening and closing warning function, comprising a light curtain housing 1 and positioning frames 2 fixed at both ends. A groove is formed on the left side of the light curtain housing 1, and the light curtain body 3 is connected inside the groove. Warning LEDs 4 are installed on both sides of the light curtain body 3, symmetrically distributed on the front and rear sides of the light curtain body 3, and arranged in an equidistant array. The light curtain housing 1 is connected to the elevator door through the positioning frames 2 at both ends. During installation, the light curtain body 3 must be kept parallel and at a consistent height. After installation, a test is required to ensure operational status. The dual-color warning LEDs 4 are arranged in an array to achieve different height coverage warnings. The warning LEDs 4 are diffuse light sources, conspicuous but not glaring. The warning LEDs 4 are connected to the elevator control terminal and linked with the elevator door. When the elevator door closes, the dual colors flash alternately at a frequency of 1-2Hz, and the light color is any two of red, blue, and yellow.

[0030] A movable frame 5 is fitted around the light curtain body 3. Limiting grooves 6 are opened on the front and rear sides of the light curtain housing 1, and the movable frame 5 slides in conjunction with the limiting grooves 6. A transmission groove 7 is opened on the right side of the light curtain housing 1. A first rack 8 is fixed inside the transmission groove 7. A lifting motor 9 is connected to the right side of the movable frame 5. A lifting gear 10 is connected to the left shaft end of the lifting motor 9. The lifting gear 10 meshes with the first rack 8. A slider is fixed to the inner wall of the right side of the movable frame 5. The slider extends into the transmission groove 7 and slides in conjunction with the transmission groove 7. The lifting gear 10 is set inside the slider. The slider has openings on both sides. The lifting gear 10 extends to the outside of the openings and meshes with the first rack 8. Touch switches 25 are fixed to the inner walls of both ends of the limiting groove 6. Touch plates 11 are connected to the upper and lower sides of the movable frame 5, and the touch plates 11 are in contact with the touch switches 25. The light curtain body 3 is fitted with a sliding frame 5. The inner walls of the front and rear of the frame 5 are slidably fitted with the limiting groove 6 to maintain sliding stability. The frame 5 can be smoothly raised and lowered outside the light curtain body 3. During the raising and lowering process, it can block parts of the light curtain body 3 in sequence. The light curtain body 3 can be detected when the elevator is stationary, ensuring the stable and reliable operation of the light curtain body 3.

[0031] The slider fixed to the inner right wall of the movable frame 5 slides in conjunction with the transmission groove 7, further improving the stability of the movable frame 5 during lifting. A first rack 8 is installed inside the transmission groove 7, and the lifting motor 9 drives the lifting gear 10 to rotate. The lifting gear 10 engages with the first rack 8 to achieve height adjustment of the movable frame 5. To prevent malfunctions or unexpected situations such as door opening due to obstruction by the light curtain body 3 during the operation of the movable frame 5, a pressure switch 25 is provided. When the movable frame 5 is in operation, contact with the pressure switch 25 is released, thereby interrupting the signal transmission for elevator door opening and closing, ensuring normal operation during the light curtain detection process.

[0032] A rotating rod 12 is connected to the inner wall of the left side of the movable frame 5. A cleaning brush 13 is connected to the middle of the rotating rod 12. An air guide hood 21 is fixed to the upper left side of the movable frame 5. The lower end of the air guide hood 21 extends into the interior of the movable frame 5. An impeller 23 is provided inside the air guide hood 21. The rear end of the rotating rod 12 is connected to the first gear 14. The inner wall of the movable frame 5 is rotatably connected to the transmission gear 15, and the transmission gear 15 meshes with the first gear 14. A second rack 16 is fixed to the outer wall of the rear side of the light curtain housing 1. The second rack 16 meshes with the transmission gear 15. A guide cover 17 is fixed to the inner left side of the movable frame 5. A cleaning block 19 is slidably connected to the lower end of the guide cover 17. A reciprocating screw 18 is connected to the middle of the cleaning block 19. Both ends of the reciprocating screw 18 are rotatably connected to the movable frame 5. The rear end of the reciprocating screw 18 is connected to a second gear 20, which meshes with the first gear 14. The lower end of the cleaning block 19 contacts the cleaning brush 13. The lower end of the cleaning block 19 has an array of square protrusions. The cleaning brush 13 is a flexible microfiber brush. Because dust will adhere to the light curtain body 3 after long-term use, affecting the sensing sensitivity and causing sensing malfunctions, a light curtain cleaning structure is provided. Through the setting of the cleaning brush 13, the light curtain is cleaned synchronously during the movement of the movable frame 5. During the lifting and lowering of the movable frame 5, the second rack 16 drives the transmission gear 15 to rotate. The transmission gear 15 drives the first gear 14, the rotating rod 12, and the cleaning brush 13 to rotate synchronously. The cleaning brush 13 contacts the surface of the light curtain body 3, and cleaning is achieved during the rotation. The cleaning brush 13, made of flexible microfiber, can prevent damage to the surface of the light curtain body 3. Because the brush surface is prone to dust accumulation after repeated cleaning, continued use will cause secondary pollution to the surface of the light curtain body 3. Therefore, the cleaning brush 13 is designed with an oscillation structure. Through the cooperation of the first gear 14 and the second gear 20, the reciprocating screw 18 is driven to rotate. When the reciprocating screw 18 rotates, it drives the cleaning block 19 to move back and forth. When the cleaning block 19 moves back and forth, it collides with the bristles of the cleaning brush 13, causing the dust to fall off the bristles and keeping the cleaning brush 13 clean and effective.

[0033] A rotating shaft 22 is fixed in the middle of the impeller 23. The rotating shaft 22 is rotatably connected to the inner wall of the air guide shroud 21. The front end of the rotating shaft 22 passes through the outside of the air guide shroud 21. A second motor 24 is fixed to the front end of the air guide shroud 21, and the shaft end of the second motor 24 is connected to the rotating shaft 22. The impeller 23 is adapted to the inner wall of the air guide shroud 21. An air inlet is opened on the left side of the air guide shroud 21. The air inlets are evenly distributed in an array, and a filter screen is provided on the outside of the air inlet. When the cleaning brush 13 cleans dust, dust is easily caused to float in the air. To avoid secondary pollution of the light curtain after cleaning by floating dust, an air jet structure is set to guide the dust downward. The second motor 24 drives the rotating shaft 22 and the impeller 23 to rotate inside the air guide shroud 21, guiding and delivering air to the top of the cleaning brush 13. When the movable frame 5 moves from top to bottom, it blows the dust downward. The filter screen structure is also provided to filter the dust in the air and keep the blown air clean.

[0034] Example 2: The present invention provides a technical solution: The difference between this example and Example 1 is that an audio warning structure is provided. In this example, speakers are installed at both ends of the opposite side after the light curtain housing 1 is installed. The speakers are linked with the elevator door opening and closing structure, and can simultaneously broadcast door opening and closing reminders when the door is opened and closed, further improving the warning effect and elevator safety.

[0035] The contents not described in detail in this specification are prior art known to those skilled in the art. Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An elevator light curtain with a door opening and closing warning function, comprising a light curtain housing (1) and positioning frames (2) fixed at both ends, wherein a groove is formed on the left side of the light curtain housing (1), and the light curtain body (3) is connected inside the groove, characterized in that: Warning light beads (4) are installed on both sides of the light curtain body (3), and a movable frame (5) is fitted on the outside of the light curtain body (3). Limiting grooves (6) are opened on the front and rear sides of the light curtain shell (1), and the movable frame (5) and the limiting groove (6) slide together. The light curtain housing (1) has a transmission groove (7) on the right side, and a first rack (8) is fixed inside the transmission groove (7). The right side of the movable frame (5) is connected to a lifting motor (9), and the left shaft end of the lifting motor (9) is connected to a lifting gear (10). The lifting gear (10) meshes with the first rack (8). The movable frame (5) is connected to the inner wall of the left side by a rotating rod (12), and a cleaning brush (13) is connected to the middle of the rotating rod (12). The upper left side of the movable frame (5) is fixed with a wind guide hood (21), and the lower end of the wind guide hood (21) extends into the interior of the movable frame (5). An impeller (23) is provided inside the wind guide hood (21).

2. The elevator light curtain with door opening / closing warning function according to claim 1, characterized in that: The warning light beads (4) are symmetrically distributed on the front and rear sides of the light curtain body (3), and the warning light beads (4) are distributed in an equidistant array.

3. An elevator light curtain with door opening / closing warning function according to claim 1, characterized in that: A slider is fixed to the inner wall of the right side of the movable frame (5). The slider extends into the transmission groove (7) and slides with the transmission groove (7).

4. An elevator light curtain with door opening / closing warning function according to claim 3, characterized in that: The lifting gear (10) is located inside the slider. The slider has openings on both sides, and the lifting gear (10) extends to the outside of the openings. The lifting gear (10) meshes with the first rack (8). The inner walls of the two ends of the limiting slide (6) are fixed with touch switches (25), and the upper and lower sides of the movable frame (5) are connected to the pressure plates (11), and the pressure plates (11) are in contact with the touch switches (25).

5. An elevator light curtain with door opening / closing warning function according to claim 1, characterized in that: The rear end of the rotating rod (12) is connected to the first gear (14), the inner wall of the movable frame (5) is rotatably connected to the transmission gear (15), and the transmission gear (15) meshes with the first gear (14). The outer wall of the rear side of the light curtain housing (1) is fixed with the second rack (16), and the second rack (16) meshes with the transmission gear (15).

6. An elevator light curtain with door opening / closing warning function according to claim 1, characterized in that: A guide cover (17) is fixed on the inner wall of the left side of the movable frame (5). The lower end of the guide cover (17) is slidably connected to the cleaning block (19). The middle part of the cleaning block (19) is connected to the reciprocating screw (18). The two ends of the reciprocating screw (18) are rotatably connected to the movable frame (5). The rear end of the reciprocating screw (18) is connected to the second gear (20). The second gear (20) meshes with the first gear (14).

7. An elevator light curtain with door opening / closing warning function according to claim 6, characterized in that: The lower end of the cleaning block (19) is in contact with the cleaning brush (13), and the lower end of the cleaning block (19) has square protrusions arranged in an array. The cleaning brush (13) is a flexible microfiber brush.

8. An elevator light curtain with door opening / closing warning function according to claim 1, characterized in that: The impeller (23) has a fixed rotating shaft (22) in the middle. The rotating shaft (22) is rotatably connected to the inner wall of the air guide shroud (21). The front end of the rotating shaft (22) passes through the outside of the air guide shroud (21). The front end of the air guide shroud (21) has a fixed second motor (24). The shaft end of the second motor (24) is connected to the rotating shaft (22).

9. An elevator light curtain with door opening / closing warning function according to claim 8, characterized in that: The impeller (23) is adapted to the inner wall of the air guide shroud (21). An air inlet is opened on the left side of the air guide shroud (21). The air inlets are distributed in an equidistant array. A filter screen is provided on the outer cover of the air inlet.

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