A structure for an anti-interference fixed photoelectric switch

Abstract

This utility model belongs to the field of optoelectronic switching technology and discloses a structure for an anti-interference fixed optoelectronic switch, including two sets of housings. A light sheet fixing block is provided on one side of each housing, and a light sheet is fixed inside the light sheet fixing block. A protective head is inserted into the light sheet fixing block. A light emitter and a light receiver are respectively installed in the two sets of housings. A glass plate is set near the light emitter, and a filter is set near the light receiver. The filter can filter out stray light and allow only light of a specific wavelength to pass through. By selecting a filter that matches the light emitter, only the light emitted by the light emitter can be allowed to enter the device to trigger the receiver. The front end of the protective structure is provided with a dust-blocking edge and a light-shielding tube, which can block dust and lengthen the light path. This utility model has a compact and reasonable structural design. By emitting light through the light emitter, it can detect whether there is an object passing through the light path. The light sheet can filter out stray light, has an anti-external light interference function, can prevent false alarms, and has good anti-interference performance.

Description

Technical Field

[0001] This utility model relates to the field of optoelectronic switching technology, specifically to a structure for an anti-interference fixed optoelectronic switch. Background Technology

[0002] A photoelectric switch, short for photoelectric proximity switch, detects the presence or absence of an object by utilizing its ability to block or reflect a light beam. A synchronous circuit then activates the circuit. The object is not limited to metal; any object that reflects light can be detected. A photoelectric switch typically consists of a light source and a photodetector such as a photoresistor, photodiode, or phototransistor. Specifically, the working principle of a photoelectric switch is as follows: when an object enters the path of a light beam, it blocks the light, preventing the photodetector from receiving the light signal. The system detects this change and switches its output state, thus achieving the switching function. Some photoelectric switches also utilize the photoelectric effect.

[0003] When photoelectric switches are in use, external light sources are inevitably present, such as factory lighting and sunlight. These external light sources can affect the photoelectric switch. When the external light source activates the receiver of the photoelectric switch, the receiver will continuously trigger the "receive signal". Originally, the detection point being blocked did not affect the output signal of the receiver, but the photoelectric switch caused a false alarm. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this invention provides a structure for an anti-interference fixed photoelectric switch, thereby solving the problems mentioned in the background section, such as external light affecting the receiver and causing false alarms in the photoelectric switch.

[0006] (II) Technical Solution

[0007] To achieve the above-mentioned objectives, this utility model provides the following technical solution: a structure for an anti-interference fixed photoelectric switch, comprising two sets of housings, a light sheet fixing block provided on one side of each housing, a light sheet fixed inside the light sheet fixing block, a protective head inserted into the light sheet fixing block, and a light transmitter and a light receiver respectively installed in the two sets of housings.

[0008] Preferably, the housing has an internal cavity, a threaded protrusion is provided on one side of the housing, a light-transmitting hole is provided at the center of the threaded protrusion and the light-transmitting hole communicates with the internal cavity, and a top ring is provided on the side of the threaded protrusion away from the housing.

[0009] Preferably, the light-transmitting holes of the two sets of housings are arranged opposite each other, and the light emitter and the light receiver are respectively fixedly installed in the internal cavity and arranged opposite each other.

[0010] Preferably, the light sheet fixing block includes a structural block, a stop block, and a light sheet fixing hole. The structural block has a light sheet fixing hole corresponding to the threaded protrusion. A stop block is provided on the side of the light sheet fixing hole away from the housing. A light-passing hole is provided on the stop block. A light sheet is installed at the bottom of the light sheet fixing hole. One side of the light sheet abuts against the stop block, and the other side abuts against the top ring.

[0011] Preferably, the light sheet is a glass sheet and a filter, with the glass sheet being used near the light emitter and the filter being used near the light receiver.

[0012] Preferably, the protective head includes a structural plate, plug-in posts, and a protective structure. The structural plate is provided with four sets of plug-in posts. The structural plate is plugged into and connected to the light sheet fixing block. The protective structure is provided on the side of the structural plate away from the light sheet fixing block.

[0013] Preferably, the protective structure is a dust-blocking edge and a light-shielding tube, with the dust-blocking edge located near the light emitter and the light-shielding tube located near the light receiver.

[0014] (III) Beneficial Effects

[0015] Compared with the prior art, this utility model provides a structure for an anti-interference fixed photoelectric switch, which has the following beneficial effects:

[0016] 1. The structure of this anti-interference fixed photoelectric switch includes a light emitter, a light receiver, and a light plate. The light emitter can emit light and detect whether there are objects passing through the light path. The light plate can filter stray light and has the function of preventing external light interference. It can prevent false alarms and has good anti-interference performance.

[0017] 2. It is equipped with a light filter to filter out noise, allowing only light of a fixed wavelength to pass through. This prevents external light interference, makes the detection more accurate, prevents false alarms, and has good anti-interference performance.

[0018] 3. It is equipped with a protective structure to block dust from entering the interior and prevent dust from adhering to the light sheet and affecting the light transmission. In addition, the long light-blocking tube extends the light channel and prevents external stray light from entering the interior, providing good anti-interference performance. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is an exploded view of the overall structure of this utility model;

[0021] Figure 3 This is an exploded cross-sectional view of the overall structure of this utility model;

[0022] Figure 4 This is a schematic diagram of the housing, light sheet fixing block, and protective head of this utility model.

[0023] In the diagram: 1. Housing; 2. Optical sheet fixing block; 3. Protective head; 4. Internal cavity; 5. Threaded protrusion; 6. Light transmission hole; 7. Top ring; 8. Stop block; 9. Optical sheet fixing hole; 10. Glass plate; 11. Filter; 12. Structural plate; 13. Insertion post; 14. Dust baffle; 15. Light shielding tube; 16. Light emitter; 17. Light receiver. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Please see Figure 1-4 This utility model provides a technical solution:

[0026] An anti-interference fixed photoelectric switch structure includes two sets of housings 1. A light sheet fixing block 2 is provided on one side of each housing 1, and a light sheet is fixed inside the light sheet fixing block 2. A protective head 3 is inserted into the light sheet fixing block 2. A light emitter 16 and a light receiver 17 are respectively installed inside the two sets of housings 1. The light sheet has a filtering effect, preventing light sources other than the emitter from interfering with the receiver, thereby preventing external light interference, making detection more accurate, and avoiding false alarms.

[0027] Furthermore, an internal cavity 4 is formed inside the housing 1, and a threaded protrusion 5 is provided on one side of the housing 1. A light-transmitting hole 6 is formed in the center of the threaded protrusion 5, and the light-transmitting hole 6 communicates with the internal cavity 4. A top ring 7 is provided on the side of the threaded protrusion 5 away from the housing 1. An external thread is formed on the threaded protrusion 5, and a corresponding internal thread is formed in the corresponding light plate fixing hole 9. The outer surface of the top ring 7 should be as smooth and flat as possible. The top ring 7 will compress and fix the light plate.

[0028] Furthermore, the light-transmitting holes 6 of the two sets of housings 1 are arranged opposite each other, and the light emitter 16 and the light receiver 17 are respectively fixedly installed in the internal cavity 4 and arranged opposite each other. It is recommended that the light emitter 16 be an infrared light emitter. The wavelength of infrared light is usually between 780 nm and 1 mm. Compared with visible light, infrared light has a stronger penetrating ability in the medium. The response time of infrared light sensors is relatively short, which is very important for applications that require rapid detection and reaction (such as motion detection). Infrared light has low visibility to the human eye, so it will not cause visual interference when used in the environment, and the light pollution is small.

[0029] Furthermore, the light sheet fixing block 2 includes a structural block, a stop block 8, and a light sheet fixing hole 9. The structural block has a light sheet fixing hole 9 corresponding to the threaded protrusion 5. The side of the light sheet fixing hole 9 away from the housing 1 has a stop block 8. The stop block 8 has a light-passing hole. A light sheet is installed at the bottom of the light sheet fixing hole 9. One side of the light sheet abuts against the stop block 8, and the other side abuts against the top ring 7.

[0030] Furthermore, the light-emitting device consists of a glass plate 10 and a filter 11. The glass plate 10 is positioned near the light emitter 16, and the filter 11 is positioned near the light receiver 17. The light output end can use ordinary glass or other transparent plates, whose main function is to protect the internal emitter from insects, dust, and other debris. The filter 11 is a bandpass filter, which filters stray light and allows only light within a specific wavelength range to pass through, allowing light corresponding to the emitter to pass while blocking other light. This prevents external light from interfering with the receiving device. It is recommended that the emitter use an infrared light emitter and the filter 11 use a long-wave infrared filter.

[0031] Furthermore, the protective head 3 includes a structural plate 12, insertion posts 13, and a protective structure. The structural plate 12 is provided with four sets of insertion posts 13. The structural plate 12 is inserted and connected to the light sheet fixing block 2. A protective structure is provided on the side of the structural plate 12 facing away from the light sheet fixing block 2. The protective head 3 is used to prevent damage to the light sheet and to lengthen the light path, thus preventing stray light from entering.

[0032] Furthermore, the protective structure consists of a dust baffle 14 and a light-shielding tube 15. The dust baffle 14 is positioned near the light emitter 16, and the light-shielding tube 15 is positioned near the light receiver 17. The dust baffle 14 is used to block dust, and therefore there is a gap below the dust baffle 14. The light-shielding tube 15 extends the light path to prevent external light from entering.

[0033] Working principle: When using this structure, the light emitter 16 and the light receiver 17 can be placed in two sets of housings 1 respectively, with them facing each other. The middle path is the detection point. The light emitted by the light emitter 16 passes through the light-transmitting hole 6, the glass plate 10 and the light plate fixing block 2 in sequence. The light transmission needs to pass through the light-shielding tube 15, the light filter 11 and the light-transmitting hole 6 to reach the light receiver 17. The light receiver 17 receives the light signal and converts it into an electrical signal for output. When an object appears at the detection point, the light is blocked by the object and the signal will be interrupted. The light receiver 17 cannot receive the signal, and the running status of the object can be determined accordingly.

[0034] 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 alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A structure for an anti-interference fixed photoelectric switch, comprising two sets of housings (1), characterized in that: The housing (1) has a light sheet fixing block (2) on one side, and a light sheet is fixed inside the light sheet fixing block (2). A protective head (3) is inserted into the light sheet fixing block (2). A light transmitter (16) and a light receiver (17) are installed in the two sets of housings (1).

2. The structure of the anti-interference fixed photoelectric switch according to claim 1, characterized in that: The housing (1) has an internal cavity (4) and a threaded protrusion (5) on one side. The threaded protrusion (5) has a light-transmitting hole (6) in the center and the light-transmitting hole (6) is connected to the internal cavity (4). The threaded protrusion (5) has a top ring (7) on the side away from the housing (1).

3. The structure of the anti-interference fixed photoelectric switch according to claim 2, characterized in that: The light-transmitting holes (6) of the two sets of housings (1) are arranged opposite to each other, and the light emitter (16) and the light receiver (17) are respectively fixedly installed in the internal cavity (4) and arranged opposite to each other.

4. The structure of the anti-interference fixed photoelectric switch according to claim 1, characterized in that: The light sheet fixing block (2) includes a structural block, a stop block (8) and a light sheet fixing hole (9). The structural block has a light sheet fixing hole (9) corresponding to the threaded protrusion (5). The side of the light sheet fixing hole (9) away from the housing (1) has a stop block (8). The stop block (8) has a light-passing hole. A light sheet is installed at the bottom of the light sheet fixing hole (9). One side of the light sheet abuts against the stop block (8) and the other side abuts against the top ring (7).

5. The structure of the anti-interference fixed photoelectric switch according to claim 1, characterized in that: The light sheet is a glass sheet (10) and a filter (11), with the glass sheet (10) located near the light emitter (16) and the filter (11) located near the light receiver (17).

6. The structure of the anti-interference fixed photoelectric switch according to claim 1, characterized in that: The protective head (3) includes a structural plate (12), plug-in posts (13) and a protective structure. The structural plate (12) is provided with four sets of plug-in posts (13). The structural plate (12) is plugged into the light sheet fixing block (2). The side of the structural plate (12) away from the light sheet fixing block (2) is provided with a protective structure.

7. The structure of the anti-interference fixed photoelectric switch according to claim 6, characterized in that: The protective structure consists of a dust baffle (14) and a light-shielding tube (15). The dust baffle (14) is located near the light emitter (16), and the light-shielding tube (15) is located near the light receiver (17).

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