Elevator light curtain capable of automatically removing water drops or condensation

Abstract

The utility model belongs to the technical field of elevator safety equipment, and particularly discloses an elevator light curtain capable of automatically removing water drops or condensation, which comprises a controller arranged at the upper end of an elevator car, a power supply and light curtain bodies arranged on car doors on two sides of the elevator car, the light curtain body comprises a fixing piece made of aluminum alloy, a protective cover is installed on one side of the fixing piece, and a heating device used for heating the protective cover is attached to the side, located in the fixing piece, of the protective cover. According to the elevator light curtain, the heating device, the humidity sensor and the controller are arranged on the elevator light curtain, the humidity of the surface of the light curtain can be automatically detected, the heating device is automatically started to remove water drops or condensation when the humidity reaches the preset threshold value, and the problem that the elevator light curtain fails due to the water drops or condensation in humid weather is effectively solved; and the safety and the reliability of elevator operation are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of elevator safety equipment, and particularly relates to an elevator light curtain capable of automatically removing water droplets or condensation. Background Technique

[0002] The elevator light curtain is composed of an infrared emitter, a receiver, a special flexible cable, etc., and is usually installed on both sides of the elevator car door. It is an essential safety component for passenger elevators and freight elevators on the market at present; during the electric operation process, the elevator light curtain is used to detect whether there are obstacles between the elevator doors. If there are obstacles, the light curtain will send a signal to reopen the elevator door. If there are no obstacles, the elevator door will close normally to ensure the safety of elevator passengers.

[0003] However, under humid weather conditions, water droplets or condensation often form on the protective cover of the light curtain. These water droplets or condensation will cause interference to the infrared emission and reception of the light curtain, making the light curtain ineffective and posing a safety hazard to elevator operation.

[0004] At present, the method for removing water droplets or condensation on the protective cover of the light curtain usually adopts the method of manual wiping. However, manual wiping not only has a high maintenance cost but also has the defect of untimely wiping, delaying the use of the elevator by passengers. Therefore, we need to propose an elevator light curtain capable of automatically removing water droplets or condensation to solve the above problems, enabling it to have the function of automatically removing water droplets or condensation to reduce the maintenance cost of the elevator light curtain. Content of the Utility Model

[0005] The purpose of the utility model is to provide an elevator light curtain capable of automatically removing water droplets or condensation, effectively solving the problem that the elevator light curtain fails due to water droplets or condensation under humid weather conditions, and improving the safety and reliability of elevator operation, so as to solve the problems raised in the background technique.

[0006] To achieve the above purpose, the utility model provides the following technical solution: an elevator light curtain capable of automatically removing water droplets or condensation, including a controller, a power supply installed at the upper end of the car, and a light curtain body installed on the car doors on both sides of the car. A humidity sensor is installed on one side of one of the light curtain bodies;

[0007] The light curtain body includes a fixing member made of aluminum alloy material. The fixing member is fixed on the edge of the car door of the car. A protective cover is installed on one side of the fixing member. A heating device for heating the protective cover is attached to the side of the protective cover located inside the fixing member. The controller is electrically connected to the humidity sensor, the heating device, and the power supply respectively.

[0008] Preferably, the heating device is a heating film made of a transparent conductive material, and the heating power of the heating film is set to 5-10W.

[0009] Preferably, the humidity sensor is set as a capacitive humidity sensor or a resistive humidity sensor, and a temperature sensor is also installed on the light curtain body where the humidity sensor is installed.

[0010] Preferably, convex portions are integrally formed at opposite ends of the protective cover, and notches for inserting the convex portions are provided on the fixing member.

[0011] Preferably, an infrared emitter is installed inside one of the light curtain bodies through a circuit board, and an infrared receiver is installed inside the other light curtain body through a circuit board. An installation notch for installing the circuit board is provided inside the fixing member.

[0012] Preferably, two sets of heating films are provided, and the two sets of heating films are symmetrically fixed at both ends of the protective cover.

[0013] Preferably, a plurality of transparent heat-conducting sheets are provided between the two heating films, and the plurality of heat-conducting sheets are equidistantly distributed on the protective cover. The infrared receiver and the infrared emitter are respectively located between two heat-conducting sheets.

[0014] Preferably, a rectangular heat-conducting sheet is provided between the two heating films. A first relief hole for the infrared receiver and the infrared emitter to pass through is provided on the heat-conducting sheet, and the heating films are attached to both ends of the heat-conducting sheet.

[0015] Preferably, the heating film is arranged in a rectangular sheet shape, the width of the heating film is the same as the distance between the two side notches, and a second relief hole for the infrared receiver and the infrared emitter to pass through is provided on the heating film.

[0016] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0017] 1. The present utility model is provided with a heating device, a humidity sensor and a controller on the elevator light curtain, which can automatically detect the humidity on the surface of the light curtain and automatically start the heating device to remove water droplets or condensation when the humidity reaches a preset threshold, effectively solving the problem that the elevator light curtain fails due to water droplets or condensation in humid weather, and improving the safety and reliability of elevator operation.

[0018] 2. Through the cooperation of the controller, the humidity sensor, the heating device and the power supply, the present utility model can form a complete automatic humidity monitoring system, which is convenient for the automation of the maintenance of the light curtain body. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of the present utility model;

[0020] Figure 2 is a schematic diagram of the internal structure of the light curtain body of the present utility model;

[0021] Figure 3 Schematic diagram of the heating device structure in Embodiment 2 of the present utility model;

[0022] Figure 4 Schematic diagram of the heating device structure in Embodiment 3 of the present utility model;

[0023] Figure 5 Schematic diagram of the heating device structure in Embodiment 4 of the present utility model.

[0024] In the figure: 1, light curtain body; 11, fixing part; 12, protective cover; 13, notch; 14, heating film; 15, installation notch; 16, heat conducting sheet; 17, first relief hole; 18, second relief hole; 2, humidity sensor; 3, controller; 4, car door; 5, infrared emitter; 6, circuit board. Detailed implementation manners

[0025] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0026] Embodiment 1

[0027] Please refer to Figure 1-2 , the present utility model provides a technical solution: an elevator light curtain for automatically removing water droplets or condensation, including a controller 3, a power supply installed at the upper end of the car, and a light curtain body 1 installed on the car doors 4 on both sides of the car. A humidity sensor 2 is installed on one side of one of the light curtain bodies 1; the light curtain body 1 includes a fixing part 11 made of aluminum alloy, the fixing part 11 is fixed on the edge of the car door 4 of the car, and a protective cover 12 is installed on one side of the fixing part 11. A heating device for heating the protective cover 12 is attached to the side of the protective cover 12 located inside the fixing part 11. The controller 3 is electrically connected to the humidity sensor 2, the heating device, and the power supply respectively. The controller 3 is set as a single-chip microcomputer or a programmable logic controller.

[0028] A heating device, a humidity sensor 2, and a controller 3 are provided on the elevator light curtain. The humidity sensor 2 can automatically detect the humidity on the surface of the light curtain and automatically start the heating device when the humidity reaches a preset threshold. The heating device heats the protective cover 12 to remove water droplets or condensation on the surface of the protective cover 12, effectively solving the problem that the elevator light curtain fails due to water droplets or condensation in humid weather, and improving the safety and reliability of elevator operation.

[0029] The heating device is provided as a heating film 14 made of a transparent conductive material. The heating power of the heating film 14 is set to 5 - 10W. The heating film 14 is a resistive heating film, such as indium tin oxide, and is installed by evenly coating or laminating on the surface of the light curtain body 1. The resistance value and power of the heating film 14 are designed according to the size of the light curtain and the water removal requirement. The circuit of the heating film 14 is connected to the controller 3, and the controller 3 controls the on / off and magnitude of the current, thereby realizing precise control of the heating temperature and time, which is convenient for automatic maintenance of the light curtain body 1.

[0030] The humidity sensor 2 is provided as a capacitive humidity sensor or a resistive humidity sensor. A temperature sensor is also installed on the light curtain body 1 where the humidity sensor 2 is installed. The humidity sensor 2 is used to sense the humidity value on the surface of the light curtain body 1 in real time, and the humidity sensor 2 is used to sense the temperature on the surface of the light curtain body 1 in real time, so as to control the heating device to heat or stop, which is convenient for automatic control.

[0031] Convex protrusions are integrally formed at opposite ends of the protective cover 12, and notches 13 for inserting the convex protrusions are provided on the fixing member 11, which is convenient for fixing the protective cover 12 on the fixing member 11.

[0032] An infrared emitter 5 is installed inside one of the light curtain bodies 1 through a circuit board 6, and an infrared receiver is installed inside the other light curtain body 1 through a circuit board 6. An installation slot 15 for installing the circuit board 6 is provided inside the fixing member 11. The circuit board 6 provides support for the infrared receiver and the infrared emitter 5. There are multiple infrared receivers and infrared emitters 5 located inside the light curtain body 1, and the multiple infrared receivers and infrared emitters 5 are arranged at equal distances to improve the detection of obstacles at different positions of the car door 4. The installation slot 15 is convenient for installing the circuit board 6.

[0033] Two groups of the heating film 14 are provided, and the two groups of the heating film 14 are symmetrically fixed at both ends of the protective cover 12. The heat sources are diffused from both ends of the protective cover 12 to the middle by using the two heating films 14, which is convenient for realizing the uniformity of the overall temperature of the protective cover 12.

[0034] Embodiment 2

[0035] The same parts will not be repeated. Different from Embodiment 1, as Figure 3 shown, a plurality of transparent heat-conducting sheets 16 are provided between the two heating films 14, and the plurality of heat-conducting sheets 16 are equally spaced on the protective cover 12. The infrared receiver and the infrared emitter 5 are respectively located between two heat-conducting sheets 16. By equally spacing the plurality of heat-conducting sheets 16 on the protective cover 12, it can ensure the uniform diffusion of heat inside the protective cover 12, so that the temperature of the protective cover 12 can be evenly distributed.

[0036] Example 3

[0037] The same parts will not be repeated. Different from Embodiment 1, as Figure 4 shown, a rectangular heat conducting sheet 16 is arranged between the two heating films 14. A first relief hole 17 for the infrared receiver and the infrared transmitter 5 to pass through is formed in the heat conducting sheet 16. The heating films 14 are attached to both ends of the heat conducting sheet 16. The heat between the heating films 14 can be transferred through the rectangular heat conducting sheet 16, so that the heating films 14 can uniformly heat the protective cover 12, facilitating the removal of water droplets or condensation on the outside of the protective cover 12. Through the arrangement of the first relief hole 17, it is convenient for the infrared receiver and the infrared transmitter 5 to pass infrared light through the protective cover 12.

[0038] Example 4

[0039] The same parts will not be repeated. Different from Embodiment 1, as Figure 5 shown, the heating film 14 is arranged in a rectangular sheet shape. The width of the heating film 14 is the same as the distance between the two side notches 13. A second relief hole 18 for the infrared receiver and the infrared transmitter 5 to pass through is formed in the heating film 14, facilitating heating the protective cover 12 from different positions through the rectangular heating film 14, improving the uniformity of heating of the protective cover 12, and reducing the generation of water droplets or condensation in some parts caused by uneven local temperature on the outside of the protective cover 12.

[0040] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood 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 that automatically removes water drops or condensation, characterized in that: It comprises a controller (3) installed at the upper end of the car, a power supply, and a light curtain body (1) installed on car doors (4) on both sides of the car, wherein a humidity sensor (2) is installed on one side of the light curtain body (1); The light curtain body (1) comprises a fixing part (11) made of aluminum alloy, the fixing part (11) is fixed to the edge of the car door (4), a protective cover (12) is installed on one side of the fixing part (11), a heating device for heating the protective cover (12) is attached to one side of the protective cover (12) located inside the fixing part (11), and the controller (3) is electrically connected to the humidity sensor (2), the heating device and the power supply respectively.

2. The elevator light curtain for automatically removing water drops or condensation according to claim 1, characterized in that: The heating device is configured as a heating film (14) made of a transparent conductive material, and the heating power of the heating film (14) is configured to be 5-10W.

3. The elevator light curtain for automatically removing water drops or condensation according to claim 2, characterized in that: The humidity sensor (2) is configured as a capacitive humidity sensor or a resistive humidity sensor, and a temperature sensor is also installed on the light curtain body (1) on which the humidity sensor (2) is installed.

4. The elevator light curtain for automatically removing water drops or condensation according to claim 3, characterized in that: The protective cover (12) has protrusions integrally formed at opposite ends, and the fixing member (11) is provided with recesses (13) for the protrusions to be inserted into.

5. The elevator light curtain for automatically removing water drops or condensation according to claim 4, characterized in that: An infrared transmitter (5) is installed inside one of the light curtain bodies (1) via a circuit board (6), an infrared receiver is installed inside the other light curtain body (1) via a circuit board (6), and a mounting notch (15) for mounting the circuit board (6) is provided inside the fixing member (11).

6. The elevator light curtain for automatically removing water drops or condensation according to claim 5, characterized in that: Two groups of the heating films (14) are provided, and the two groups of the heating films (14) are symmetrically fixed at two ends of the protective cover (12).

7. The elevator light curtain for automatically removing water drops or condensation according to claim 6, characterized in that: A plurality of transparent heat-conducting sheets (16) are arranged between the two heating films (14), and the plurality of heat-conducting sheets (16) are evenly distributed on the protective cover (12), and the infrared receiver and the infrared transmitter (5) are respectively located between the two heat-conducting sheets (16).

8. The elevator light curtain for automatically removing water drops or condensation according to claim 6, characterized in that: A rectangular heat-conducting sheet (16) is arranged between the two heating films (14), and a first clearance hole (17) is provided on the heat-conducting sheet (16) for the infrared receiver and the infrared transmitter (5) to pass through, and the heating film (14) is attached to both ends of the heat-conducting sheet (16).

9. The elevator light curtain for automatically removing water drops or condensation according to claim 6, characterized in that: The heating film (14) is arranged in a rectangular sheet shape, the width of the heating film (14) is the same as the distance between the notches (13) on both sides, and a second clearance hole (18) is provided on the heating film (14) for the infrared receiver and the infrared transmitter (5) to pass through.

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