Light curtain system based on optical fiber transmission signal

Abstract

A light curtain system based on optical fiber transmission signals belongs to the technical field of elevator safety protection devices. It includes a transmitting PCB board installed on one side of the elevator car door, and a plurality of infrared transmitting tubes are installed on the transmitting PCB board at intervals along the length direction. It is characterized in that it also includes an optical fiber fixing plate, an optical fiber and a camera. The optical fiber fixing plate is installed on the other side of the elevator car door corresponding to the transmitting PCB board. The number of optical fibers is the same as that of infrared transmitting tubes. One end of each optical fiber is fixed on the optical fiber fixing plate and evenly distributed according to the spacing of the infrared transmitting tubes. The other end is connected to the camera together. The infrared transmitting tube and the optical fiber cooperate to form a detection area. Advantages: Optical fiber is used to replace the receiving LED in the existing light curtain, and optical fiber is low in cost and easy to install compared to LED, which is conducive to reducing the cost of the entire system and improving production efficiency.

Description

Technical Field

[0001] The utility model belongs to the technical field of elevator safety protection devices, and in particular relates to a light curtain system based on optical fiber transmission signals. Background Art

[0002] With the rapid development of modern urban construction and the improvement of people's living standards, the demand for elevators is increasing day by day, and users' requirements for elevator safety are also getting higher and higher. As the only access control for entering and exiting the elevator car, the elevator door safety protection device is one of the elevator safety products that users are most concerned about. At present, elevator door safety protection devices generally use infrared light curtain technology, which is mainly used in urban shopping malls, office buildings, and residential buildings to detect pedestrians entering and exiting and control the opening and closing of elevator doors. Figure 1 As shown, the structure of the existing elevator light curtain includes a transmitting PCB board 1 and a corresponding receiving PCB board 2 on both sides of the elevator car door. The infrared transmitting tube 11 on the transmitting PCB board 1 and the infrared receiving tube 21 on the receiving PCB board 2 form an infrared light curtain area. The most basic and core function of the infrared light curtain is to use the transmission and reception of infrared signals to detect the obstruction 3 in the protection area and provide signals to the upper control device. The infrared transmitting tube 11 and the infrared receiving tube 21 in the above structure need to be welded to the PCB board one by one, which takes a long time to install and is costly. In today's increasingly competitive light curtain industry, it is also very important to reduce the production cost of the light curtain and improve efficiency.

[0003] In view of the above-mentioned prior art, it is necessary to improve the structure of the existing light curtain. To this end, the applicant has made a useful design. The technical solution to be introduced below is produced in this context. Utility Model Content

[0004] The utility model aims to provide a light curtain system based on optical fiber transmission signal, which has a simple structure and is easy to install, thereby being beneficial to improving production efficiency and reducing system production costs.

[0005] The purpose of the utility model is achieved in this way. A light curtain system based on optical fiber transmission signals includes a transmitting PCB board installed on one side of an elevator car door, and a plurality of infrared transmitting tubes are installed on the transmitting PCB board at intervals along the length direction. The utility model is characterized in that it also includes an optical fiber fixing plate, an optical fiber and a camera. The optical fiber fixing plate is installed on the other side of the elevator car door corresponding to the transmitting PCB board. The number of the optical fibers is the same as that of the infrared transmitting tubes. One end of each optical fiber is fixed on the optical fiber fixing plate and is evenly distributed according to the spacing between the infrared transmitting tubes, and the other end is connected to the camera together. The infrared transmitting tube and the optical fiber cooperate to form a detection area.

[0006] In a specific embodiment of the present invention, the infrared emitting tube is fixed on the emitting PCB by welding.

[0007] In a specific embodiment of the utility model, the optical fiber is used to receive the signal emitted by the infrared transmitting tube. If an obstruction enters the detection area, the camera recognizes the change of the signal in the optical fiber and provides a signal to the upper control device to control the car door to open.

[0008] Due to the adoption of the above structure, the utility model has the beneficial effect compared with the prior art: optical fiber is used to replace the receiving LED in the existing light curtain, and optical fiber is low in cost and easy to install compared to LED, which is beneficial to reducing the cost of the entire system and improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a structural diagram of an existing elevator light curtain system;

[0010] Figure 2 It is a structural schematic diagram of the light curtain system described in the utility model.

[0011] In the figure: 1. Transmitting PCB board, 11. Infrared transmitting tube; 2. Receiving PCB board, 21. Infrared receiving tube; 3. Obstruction; 4. Optical fiber fixing plate; 5. Optical fiber; 6. Camera. DETAILED DESCRIPTION

[0012] The specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings, but the description of the embodiments is not a limitation of the technical solution. Any changes in form rather than substance based on the concept of the present invention should be regarded as the protection scope of the present invention.

[0013] In the following description, all concepts related to directionality (or orientation) such as up, down, left, right, front and back are referring to the position state of the figure being described, and are intended to facilitate public understanding. Therefore, they should not be understood as special limitations on the technical solutions provided by the present utility model.

[0014] See also Figure 2 The utility model relates to a light curtain system based on optical fiber transmission signals, including a transmitting PCB board 1 installed on one side of an elevator car door and an optical fiber fixing plate 4 installed on the other side of the elevator car door. A plurality of infrared emitting tubes 11 are installed on the transmitting PCB board 1 at intervals along the length direction. In this embodiment, the infrared emitting tube 11 is an infrared LED fixed to the transmitting PCB board 1 by welding. The light curtain system also includes optical fibers 5 and cameras 6. The number of optical fibers 5 is the same as that of infrared emitting tubes 11. One end of each optical fiber 5 is fixed on the optical fiber fixing plate 4 and is evenly distributed according to the spacing of the infrared emitting tubes 11, and the other end is connected to the camera 6. The infrared emitting tube 11 and the optical fiber 5 cooperate to form a detection area. The camera 6 can adopt MT9V034.

[0015] The signal emitted by the infrared emitting tube 11 is received by the optical fiber 5 at the receiving end, and the signal is transmitted from the optical fiber 5 to the camera 6, which recognizes the signal in the optical fiber. If an obstruction 3 enters the detection area, the camera 6 can recognize the change of the signal in the optical fiber 5 and provide a signal to the upper control device to control the car door to open. Compared with LED, the optical fiber 5 is low in cost and easy to install, which is conducive to improving production efficiency.

Claims

1. A light curtain system based on optical fiber transmission signal, comprising a transmitting PCB board (1) installed on one side of an elevator car door, wherein a plurality of infrared transmitting tubes (11) are installed on the transmitting PCB board (1) at intervals along the length direction, characterized in that: It also comprises an optical fiber fixing plate (4), an optical fiber (5) and a camera (6); the optical fiber fixing plate (4) is mounted on the other side of the elevator car door corresponding to the transmitting PCB board (1); the number of the optical fibers (5) is the same as that of the infrared transmitting tubes (11); one end of each optical fiber (5) is fixed on the optical fiber fixing plate (4) and is evenly distributed according to the spacing of the infrared transmitting tubes (11); the other end is connected to the camera (6); the infrared transmitting tubes (11) and the optical fibers (5) cooperate to form a detection area.

2. The light curtain system based on optical fiber transmission signal according to claim 1, characterized in that: The infrared emitting tube (11) is fixed on the emitting PCB board (1) by welding.

3. The light curtain system based on optical fiber transmission signal according to claim 1, characterized in that: The optical fiber (5) is used to receive the signal emitted by the infrared emitting tube (11). If an obstruction (3) enters the detection area, the camera (6) identifies the change of the signal in the optical fiber (5) and provides a signal to the upper control device to control the car door to open.

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