Elevator door with anti-pinch function

Abstract

The utility model relates to elevator door technical field, in order to solve the problem that the existing elevator door light curtain anti -pinch exists detection blind area, disclose a kind of elevator door with anti -pinch function, including oppositely arranged one car door and two car doors, both slidingly set on linear guide, one car door side wall is equipped with one mirror, two car door side wall is equipped with two mirrors, two mirrors are directly opposite and parallel arrangement;Two car doors are provided with laser generator and laser receiver, laser receiver is electrically connected elevator controller, laser generator sends oblique upward laser beam, irradiates to one mirror after, forms multiple reflection between two sides mirror, constitutes a laser detection network with beam density dynamic increase with car door closing.The utility model overcomes the detection blind area of the fixed beam spacing of traditional light curtain by the above structure, realizes the dead angle detection of small object in door area, significantly improves the safety and reliability of elevator door anti -pinch.

Description

Technical Field

[0001] This utility model relates to the field of elevator door technology, specifically to an elevator door with anti-pinch function. Background Technology

[0002] As an indispensable vertical transportation tool in modern buildings, the safety of elevators directly affects the personal safety of passengers. Among them, the opening and closing of elevator doors is the most frequent contact point for passengers. Therefore, the safety protection technology of elevator door systems, especially the anti-pinch function, has always been a key focus of industry research and design.

[0003] Currently, in the field of elevator door anti-pinch technology, light curtain anti-pinch technology has become the most mainstream and technologically advanced solution due to its advantages such as non-contact operation and fast response speed. The basic principle of this technology is to install infrared transmitters and receivers on both sides of the elevator door. By emitting dense, parallel infrared beams, an invisible "light wall" is formed at the door entrance. During the door closing process, the control system continuously monitors the status of the receivers; when any beam of infrared light is blocked by a passenger or object, the receiver cannot receive the corresponding signal, and the control system immediately issues a command to stop the door closing action and reverse the door opening, thus effectively preventing people or large objects from being pinched.

[0004] However, this widely used light curtain anti-pinch technology has an inherent and difficult-to-eradicate technical flaw—a detection blind spot. Due to technological limitations and cost considerations, the infrared beams emitted by the light curtain are not continuous but have physical gaps. These gaps are typically between a few centimeters and tens of centimeters. This design characteristic leads to the following safety hazard: when an object with a very thin cross-section enters the doorway, such as a pet leash, a child's slender finger, or the tip of an umbrella, its size may be smaller than the beam gap. If the object happens to pass through the gap between the two beams, the light curtain system will not be able to detect its presence, causing the elevator door to continue closing and eventually trapping the object.

[0005] In conclusion, although light curtain technology has greatly improved elevator safety, the "detection blind spot" caused by the gaps between the light beams remains a significant safety hazard under current technology, hindering further improvements in elevator safety. Therefore, the industry urgently needs to develop a new elevator door anti-pinch technology or optimization solution that can effectively eliminate detection blind spots and achieve comprehensive detection of small objects. Utility Model Content

[0006] To address the aforementioned technical shortcomings, this invention provides an elevator door with an anti-pinch function, which can reduce the detection blind zone as the door closes.

[0007] This utility model discloses an elevator door with anti-pinch function, including a first car door, a second car door, and a linear guide rail. The first car door and the second car door are slidably mounted on the linear guide rail. A first mounting groove is provided on the side of the first car door opposite to the second car door from bottom to top. A first reflector is installed in the first mounting groove. A second mounting groove is provided on the side of the second car door opposite to the first car door from bottom to top. A first mounting hole is provided at the upper end of the second mounting groove. A laser receiver is installed in the first mounting hole. The laser receiver is electrically connected to the elevator controller. A second reflector is installed in the second mounting groove below the laser receiver. The first reflector and the second reflector are facing each other and parallel to each other. A light-transmitting hole is provided on the lower side of the second reflector. A second mounting hole is provided on the second car door corresponding to the light-transmitting hole. A laser generator is installed in the second mounting hole. The laser emitted by the laser generator passes through the light-transmitting hole and shines on the first reflector. The laser emitted by the laser generator is tilted upward.

[0008] The principle behind the above technical solution is to install parallel, opposing reflectors on two car doors, and to mount a laser generator and laser receiver on one of the car doors. The laser generator emits an upward-sloping laser beam, which passes through a light-transmitting hole and illuminates the reflector on the opposite car door. The laser beam reflects multiple times between the two reflectors, forming a dense laser scanning network that covers the door entrance area. During the door closing process, the elevator controller monitors the reflected laser signal in real time through the laser receiver. When any small object (such as a rope or finger) obstructs the laser path, the laser receiver detects a signal interruption and immediately triggers the elevator controller to stop closing the door and reverse to open it. Because the density of the laser beam generated by multiple reflections dynamically increases during the door closing process, the detection blind zone gradually decreases, thereby effectively improving the detection capability for small objects and eliminating safety hazards.

[0009] To improve detection accuracy, the laser emitted by the laser generator is positioned at a 3-degree angle to the linear guide rail. This minute angle causes the laser beam to undergo multiple reflections between the parallel mirrors on both sides, resulting in a small, cumulative longitudinal displacement of the light spot along the mirror surface after each reflection. Thus, when the elevator door is at different opening degrees, a single laser beam forms a series of longitudinally arranged light spots of varying heights due to the different number of reflections. These spots form a dense, nearly continuous detection grating at the door entrance. As the door closes, the effective number of reflections increases, further increasing the spot density. This makes the detection blind spot smaller and smaller throughout the closing process, until it almost disappears, ultimately achieving high-precision, blind-spot-free detection of small objects such as pet leashes and children's fingers.

[0010] To effectively detect the laser, the laser receiver includes a photoelectric sensor with a vertical length of 20 centimeters. Because the laser is incident at a specific angle and reflects multiple times between parallel mirrors, the resulting spot at the receiver is vertically dispersed. The 20-centimeter length provides a sufficiently large "capture window" to cover all stages of the elevator door's opening and closing, and all spot positions generated at different numbers of reflections. This ensures that the reflected laser signal can be effectively received regardless of the door's opening degree, thus achieving uninterrupted coverage of the anti-pinch detection function throughout the entire door-closing process.

[0011] The elevator door with anti-pinch function obtained by this utility model has the following advantages: by setting a parallel reflector and an inclined laser between a pair of car doors, a laser reflection detection network that dynamically increases in density during the closing process is constructed, which effectively overcomes the detection blind zone caused by the fixed beam spacing of traditional light curtains; by setting the laser incident angle to 3 degrees and matching it with a 20 cm long vertical photoelectric sensor, the dynamic light spot is stably and completely captured throughout the entire closing stroke, thereby achieving high-precision anti-pinch detection of small objects without blind spots, significantly improving the safety and reliability of the elevator door system. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the No. 1 car door structure of this utility model;

[0013] Figure 2 This is a schematic diagram of the No. 2 car door structure of this utility model;

[0014] Figure 3 This utility model Figure 2 Enlarged view of section A in the middle;

[0015] Figure 4 This is a schematic diagram illustrating the use of this utility model;

[0016] Figure 5 This is a schematic diagram illustrating the use of this utility model. Detailed Implementation

[0017] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0018] Example 1:

[0019] like Figures 1 to 5As shown, this utility model discloses an elevator door with anti-pinch function, including a first car door 1, a second car door 3, and a linear guide rail 7. The first car door 1 and the second car door 3 are slidably mounted on the linear guide rail 7. A first mounting groove is provided on the side of the first car door 1 opposite to the second car door 3 from bottom to top, and a first reflector 2 is installed in the first mounting groove. A second mounting groove is provided on the side of the second car door 3 opposite to the first car door 1 from bottom to top. A first mounting hole is provided at the upper end of the second mounting groove, and a laser receiver 4 is installed in the first mounting hole. The laser receiver 4 includes a photoelectric sensor for detecting a laser 8. The electrical sensor has a vertical length of 20 cm. The laser receiver 4 is electrically connected to the elevator controller. A second reflector 5 is installed in the second mounting groove on the lower side of the laser receiver 4. The first reflector 2 and the second reflector 5 are opposite each other and parallel to each other. A light-transmitting hole 6 is provided on the lower side of the second reflector 5. A second mounting hole is provided on the second car door 3 corresponding to the light-transmitting hole 6. A laser generator is installed in the second mounting hole. The laser 8 emitted by the laser generator passes through the light-transmitting hole 6 and shines on the first reflector 2. The laser 8 emitted by the laser generator is tilted upward. The angle between the laser 8 emitted by the laser generator and the linear guide rail 7 is 3 degrees.

[0020] The principle of the above technical solution is to install parallel and opposite reflectors 2 and 5 on car door 1 and car door 3, and to install a laser generator and laser receiver 4 on car door 3. The laser generator emits an upward-sloping laser beam 8, which passes through the light-transmitting hole 6 and illuminates reflector 2. The laser beam 8 is reflected multiple times between reflector 2 and reflector 5, forming a dense laser beam scanning network that covers the door entrance. During the door closing process, the elevator controller monitors the reflected laser beam 8 signal in real time through the laser receiver 4. When any small object (such as a rope or finger) blocks the path of the laser beam 8, the laser receiver 4 detects a signal interruption and immediately triggers the elevator controller to stop closing the door and reverse to open it. Because the density of the laser beam 8 generated by multiple reflections dynamically increases during the door closing process, the detection blind zone gradually decreases, thereby effectively improving the detection capability of small objects and eliminating safety hazards.

Claims

1. An elevator door with anti-pinch function, comprising a first car door, a second car door, and a linear guide rail, wherein the first car door and the second car door are slidably mounted on the linear guide rail, characterized in that: On the side of car door No. 1 opposite car door No. 2, a No. 1 mounting groove is provided from bottom to top. A No. 1 reflector is installed in the No. 1 mounting groove. On the side of car door No. 2 opposite car door No. 1, a No. 2 mounting groove is provided from bottom to top. A No. 1 mounting hole is provided at the upper end of the No. 2 mounting groove. A laser receiver is installed in the No. 1 mounting hole. The laser receiver is electrically connected to the elevator controller. A No. 2 reflector is installed in the No. 2 mounting groove below the laser receiver. The No. 1 and No. 2 reflectors are directly opposite each other and parallel to each other. A light-transmitting hole is provided on the lower side of the No. 2 reflector. A No. 2 mounting hole is provided on car door No. 2 corresponding to the light-transmitting hole. A laser generator is installed in the No. 2 mounting hole. The laser emitted by the laser generator passes through the light-transmitting hole and shines on the No. 1 reflector. The laser emitted by the laser generator is tilted upward.

2. An elevator door with anti-pinch function according to claim 1, characterized in that: The angle between the laser emitted by the laser generator and the linear guide rail is 3 degrees.

3. An elevator door with anti-pinch function according to claim 2, characterized in that: The laser receiver includes a photoelectric sensor for detecting the laser, which is 20 centimeters long in the vertical direction.

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