Laser proximity sensor

Abstract

The utility model relates to a laser proximity sensor, and relates to the technical field of sensors, the laser proximity sensor comprises an integrated housing, the housing is provided with a placing groove convenient for placing a measuring circuit board, and the placing groove is provided with a step groove convenient for clamping a light transmission sheet. The depth of the stepped groove is larger than the thickness of the light-transmitting piece, the probability that accumulated water enters the surface of the light-transmitting piece is reduced, and a drainage groove facilitating timely drainage of the accumulated water on the surface of the light-transmitting piece is formed in the shell. The measuring circuit board, the laser transmitter and the laser receiver are clamped and installed in the placement groove, the shell is of an integrated structure, the waterproof performance of the shell is good, and then the light-transmitting piece is fixedly installed in the stepped groove, so that waterproof sealing is conducted on the placement groove; meanwhile, accumulated water on the light-transmitting sheet is discharged in time through the drainage groove, so that the amount of accumulated water in a gap between the placement groove and the light-transmitting sheet is reduced, the probability that the accumulated water enters the shell is reduced, and the service life of the laser sensor is prolonged.

Description

Technical Field

[0001] This application relates to the field of sensor technology, and in particular to laser proximity sensors. Background Technology

[0002] Laser sensors are sensors that utilize laser technology for measurement. They are generally classified into divergent line laser sensors and parallel line laser sensors. Laser sensors are a new type of measuring instrument that enables non-contact, long-distance measurement with high speed, high accuracy, and strong anti-interference capabilities.

[0003] A laser sensor typically includes a housing, a laser emitter, a laser receiver, a measurement circuit board, and a light-transmitting plate. Currently, the housing generally consists of an upper shell and a lower shell. During installation, the measurement circuit board is fixedly installed inside the lower shell, and then the laser emitter and laser receiver are fixedly installed on the measurement circuit board. The upper shell is then snapped onto the lower shell, so that the laser emitter and laser receiver are snapped into the upper shell. The light-transmitting plate is fixedly installed at the opening on the upper shell to facilitate the passage of the laser. Finally, the lower shell and the upper shell are connected and locked together as a whole using bolts.

[0004] However, since there are certain gaps between the upper and lower shells, and between the upper shell and the light-transmitting sheet, when the working environment of the laser sensor is in a humid environment, water can easily enter the interior of the shell through the gaps, thereby reducing the service life of the laser sensor. Utility Model Content

[0005] To reduce the probability of water entering the housing and improve the lifespan of the laser sensor, this application provides a laser proximity sensor.

[0006] The laser proximity sensor provided in this application adopts the following technical solution:

[0007] A laser proximity sensor includes an integrated housing with a placement slot for placing a measurement circuit board, a laser emitter, and a laser receiver. At the end of the placement slot away from the bottom, there is a stepped groove for engaging a light-transmitting sheet. The depth of the stepped groove is greater than the thickness of the light-transmitting sheet, reducing the probability of water entering the surface of the light-transmitting sheet. The housing also has a drainage groove for timely removal of water from the surface of the light-transmitting sheet.

[0008] By adopting the above technical solution, the measurement circuit board, laser emitter, and laser receiver are snapped into the placement slot. Since the housing is an integrated structure, the housing has good waterproof performance. Then, the light-transmitting sheet is fixedly installed in the stepped slot to waterproof and seal the placement slot. The stepped slot can also block water accumulation, reducing the probability of water entering the surface of the light-transmitting sheet. At the same time, the drainage channel drains the water on the light-transmitting sheet in a timely manner, thereby reducing the amount of water accumulation in the gap between the placement slot and the light-transmitting sheet, reducing the probability of water entering the housing, and improving the service life of the laser sensor.

[0009] Furthermore, the light-transmitting sheet is inclined, and the inclination angle is related to the detection distance. Waterproof sealant is provided at the connection between the light-transmitting sheet and the stepped groove.

[0010] By adopting the above technical solution, the measurement accuracy of the sensor is improved by tilting the light-transmitting sheet. At the same time, the tilted installation of the light-transmitting sheet also facilitates the timely drainage of water accumulated on the light-transmitting sheet, and the waterproof sealant improves the waterproof sealing between the light-transmitting sheet and the mounting groove.

[0011] Furthermore, a control slot is provided on the housing, and a control component electrically connected to the measuring circuit board is provided in the control slot. A sealing film is provided on the housing to waterproof and seal the control slot, and the sealing film has a certain degree of elasticity.

[0012] By adopting the above technical solution, users can operate the control components through the sealing membrane to adjust the sensor parameters. At the same time, the sealing membrane waterproofs and seals the control slot, reducing the probability of water seeping into the housing.

[0013] Furthermore, the control component includes:

[0014] A control board, which is bolted into a control slot and electrically connected to a measuring circuit board;

[0015] A fixing plate, wherein the fixing plate is mounted on the control plate;

[0016] A set of buttons is mounted on a fixed plate and used to press the adjustment switches on the control plate.

[0017] By adopting the above technical solution, the user can use external force to move the buttons on the fixed plate closer to the control board, and finally press them against the adjustment switch on the control board, thereby facilitating the adjustment of the sensor parameters.

[0018] Furthermore, the button component includes:

[0019] A connecting block is disposed on the side wall of the fixed plate, and the connecting block is capable of elastic deformation.

[0020] A button is provided on the connecting block. When the button is brought close to the adjustment switch under external force, the connecting block undergoes elastic deformation.

[0021] By adopting the above technical solution, when the button is brought close to the adjustment switch under the action of external force, the connecting block undergoes elastic deformation, thereby pressing the button against the adjustment switch. When the external force disappears, the connecting block returns to its original shape, thereby driving the button to move away from the adjustment switch, which facilitates the next adjustment of the sensor parameters.

[0022] Furthermore, a bracket is provided inside the housing to facilitate lens installation, the bracket comprising:

[0023] The frame is set in the placement slot and locked to the measuring circuit board. The frame has a mounting slot for easy installation of the lens.

[0024] A light guide tube, which is mounted on the frame and sealed to the laser emitter;

[0025] A focusing tube is mounted on a frame and sealed to a laser receiver. The focusing tube has a tapered structure and its diameter decreases as it approaches the laser receiver.

[0026] By adopting the above technical solution, the frame is fixedly installed in the placement slot, and the light guide tube guides the laser emitted by the laser emitter, ensuring the stability and directionality of the laser. The conical focusing tube focuses the reflected laser and finally guides it to the laser receiver, which facilitates the reception of the laser. At the same time, the light guide tube and the focusing tube isolate the laser emitter and the laser receiver from each other, improving the detection accuracy of the laser sensor.

[0027] Furthermore, the mounting slot is provided with two sets of lenses, which correspond to the laser emitter and the laser receiver respectively. The mounting slot is also provided with a baffle, which divides the mounting slot into two independent chambers.

[0028] By adopting the above technical solution, the baffle divides the mounting slot into two independent sections, thereby reducing the probability of mutual interference between the laser emitted by the laser emitter and the reflected laser, and increasing the probability of mutual interference between the sensors.

[0029] Furthermore, a threaded plug that is connected to the measuring circuit board is fixedly installed on the housing, and the threaded plug is sealed to the housing.

[0030] By adopting the above technical solution, the threaded plug is sealed on the housing and supplies power and transmits data to the sensor. At the same time, the threaded plug is easy to connect to the data cable.

[0031] Furthermore, the housing has multiple sets of mounting holes, which are isolated from the placement slots.

[0032] By adopting the above technical solution, multiple sets of mounting holes facilitate the fixed installation of the sensor. At the same time, the mounting holes and the placement groove are isolated from each other, reducing the probability of water seeping into the placement groove through the mounting holes.

[0033] In summary, this application includes at least one of the following beneficial technical effects:

[0034] By assembling the measurement circuit board, laser emitter, laser receiver, and bracket into a single unit and snapping them into the placement slot, the housing has good waterproof performance due to its integrated structure. Then, by fixing the light-transmitting sheet into the stepped groove, the placement slot is waterproofed and sealed. The stepped groove also blocks water accumulation, reducing the probability of water entering the surface of the light-transmitting sheet. At the same time, the drainage groove drains water from the light-transmitting sheet in a timely manner, thereby reducing the amount of water accumulating in the gap between the placement slot and the light-transmitting sheet, reducing the probability of water entering the housing, and improving the service life of the laser sensor. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the laser proximity sensor structure of this application;

[0036] Figure 2 This is a schematic diagram of the exploded structure of the laser proximity sensor of this application;

[0037] Figure 3 This is a schematic diagram of the shell structure of this application;

[0038] Figure 4 This is a schematic diagram of the assembled structure of the bracket and measuring circuit board of this application;

[0039] Figure 5 This is a schematic diagram of the control component structure of this application;

[0040] Figure 6 yes Figure 1 A cross-sectional schematic diagram of AA.

[0041] Reference numerals: 1. Housing; 11. Placement slot; 12. Stepped slot; 13. Drainage slot; 14. Control slot; 15. Sliding slot; 16. Mounting hole; 2. Bracket; 21. Frame; 211. Mounting slot; 212. Baffle; 22. Light guide tube; 23. Concentrator tube; 24. Lens; 3. Measuring circuit board; 31. Laser emitter; 32. Laser receiver; 4. Control assembly; 41. Control board; 42. Fixing plate; 43. Button component; 431. Connecting block; 432. Button key; 5. Light-transmitting sheet; 6. Sealing membrane; 7. Threaded plug. Detailed Implementation

[0042] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0043] This application discloses a laser proximity sensor.

[0044] Reference Figure 1 and Figure 2 The laser proximity sensor includes an integrated housing 1. The housing 1 has a placement slot 11 for placing the measurement circuit board 3, the laser emitter 31, and the laser receiver 32. The placement slot 11 has a stepped groove 12 at the end away from the bottom for attaching the light-transmitting sheet 5. The depth of the stepped groove 12 is greater than the thickness of the light-transmitting sheet 5 and reduces the probability of water entering the surface of the light-transmitting sheet 5. The housing 1 has a drainage groove 13 for timely drainage of water accumulated on the surface of the light-transmitting sheet 5.

[0045] Reference Figure 2 and Figure 3 The housing 1 is an integral structure. The placement groove 11 is opened on one side of the housing 1, and the stepped groove 12 is opened on the end of the placement groove 11 away from the bottom. A threaded plug 7 that is connected to the measuring circuit board 3 is fixedly installed on the side wall of the housing 1. The threaded plug 7 is sealed to the housing 1.

[0046] Reference Figure 2 , Figure 3 and Figure 4 The housing 1 contains a bracket 2 for easy installation of the lens 24. The bracket 2 includes a frame 21, a light guide tube 22, and a focusing tube 23. The frame 21 is fixedly installed in the placement slot 11. To facilitate accurate installation of the frame 21 in the placement slot 11, a sliding groove 15 is provided on the side wall of the placement slot 11. A protrusion that slides and engages with the sliding groove 15 is fixedly installed on the frame 21. The frame 21 is locked to the measuring circuit board 3 by bolts. The frame 21 has a mounting slot 211 for easy installation of the lens 24. Two sets of lenses 24 are installed. Lenses 24 correspond to laser emitter 31 and laser receiver 32, respectively. In order to reduce the mutual interference between the laser emitted and the reflected laser in the mounting slot 211, which would affect the detection accuracy of the sensor, a baffle 212 is fixedly installed in the mounting slot 211. The baffle 212 divides the mounting slot 211 into two independent chambers, and the two sets of lenses 24 are located in one chamber, respectively. In this embodiment, the lens 24 corresponding to the laser receiver 32 is larger than the lens 24 corresponding to the laser emitter 31, so as to facilitate the reception of reflected laser light over a wider range.

[0047] Reference Figure 2 and Figure 4The light guide tube 22 has a cylindrical structure. It is fixedly installed on the frame 21 and sealed and connected to the laser emitter 31. The light guide tube 22 guides the laser, reducing the probability of damage to the inside of the housing 1, while ensuring the stability and directionality of the laser.

[0048] Reference Figure 2 and Figure 4 Because the lens 24 corresponding to the laser receiver 32 is relatively large, in order to facilitate the entry of all reflected laser light after passing through the lens 24 into the laser receiver 32, a focusing tube 23 is fixedly installed on the frame 21. The focusing tube 23 has a conical structure, and the diameter of the focusing tube 23 is smaller the closer it is to the laser receiver 32. Specifically, the larger diameter end of the focusing tube 23 is pressed against the lens 24, and the smaller diameter end of the focusing tube 23 is pressed against the laser receiver 32. This facilitates the entry of all reflected laser light passing through the lens 24 into the focusing tube 23. Through the focusing and reflection of the focusing tube 23, all of the light eventually enters the laser receiver 32, thereby improving the reception effect of the reflected laser light. At the same time, the focusing tube 23 can also prevent the laser light inside the housing 1 from directly entering the laser receiver 32, thereby improving the detection accuracy of the sensor.

[0049] Reference Figure 2 and Figure 4 During installation, the laser emitter 31 and the laser receiver 32 are fixedly mounted on the measuring circuit board 3. Then, the light guide tube 22 and the focusing tube 23 are fixedly mounted on the bracket 2. Next, the measuring circuit board 3 is fixedly mounted on the bracket 2 with bolts, so that the laser emitter 31 is located inside the light guide tube 22 and the laser receiver 32 is located inside the focusing tube 23. The lens 24 is fixedly mounted in the mounting groove 211 and separated by the baffle 212. Finally, the assembled whole is inserted into the placement groove 11 after being guided by the sliding groove 15.

[0050] Reference Figure 1 and Figure 2 The bracket 2, with its end furthest from the bottom of the placement groove 11, is flush with the bottom of the stepped groove 12. The light-transmitting sheet 5 is then snapped into the stepped groove 12 and pressed against the bracket 2. To reduce the probability of water accumulation between the stepped groove 12 and the light-transmitting sheet 5, a drainage groove 13 is provided on the housing 1 to facilitate the timely drainage of water accumulated on the surface of the light-transmitting sheet 5. At the same time, a waterproof sealant is applied to the connection between the light-transmitting sheet 5 and the stepped groove 12 to reduce the probability of water flowing into the housing 1 through the gap between the stepped groove 12 and the light-transmitting sheet 5. In this embodiment, the drainage groove 13 is located on the bottom of the housing 1 to facilitate the timely drainage of water accumulated on the surface of the light-transmitting sheet 5 as it falls under gravity. The drainage groove 13 is formed by cutting off one side wall at one end of the stepped groove 12.

[0051] Reference Figure 2 and Figure 6The light-transmitting sheet 5 is installed at an angle on the housing 1. The light-transmitting sheet 5 and the laser emitted by the laser emitter 31 have a certain angle. The specific angle of inclination is related to the detection distance of the sensor. The distance between the light-transmitting sheet 5 and the laser receiver 32 is less than the distance between the light-transmitting sheet 5 and the laser emitter 31. The drainage groove 13 is located on the end of the light-transmitting sheet 5 near the bottom of the placement groove 11.

[0052] Reference Figure 2 and Figure 5 To facilitate the adjustment of sensor parameters, a control slot 14 is provided on the side wall of the housing 1. A control component 4 electrically connected to the measuring circuit board 3 is installed in the control slot 14. The control component 4 includes a control board 41, a fixing plate 42, and button components 43. The control board 41 is fixedly locked in the control slot 14 by bolts and electrically connected to the measuring circuit board 3 to facilitate the control of the parameters of the measuring circuit board 3. The fixing plate 42 is fixedly installed on the control board 41. Multiple sets of button components 432 are provided on the fixing plate 42. The multiple sets of button components 432 are used to press the adjustment switch on the control board 41 to facilitate the adjustment of sensor parameters.

[0053] Reference Figure 2 and Figure 4 The button component 43 includes a connecting block 431 and a button 432. The connecting block 431 is fixedly installed on the side wall of the fixed plate 42 and can undergo elastic deformation. The button 432 is fixedly installed on the end of the connecting block 431 away from the fixed plate 42. The button 432 is at a certain distance from the control plate 41 when there is no external force. When the button 432 approaches the adjustment switch under the action of external force, the connecting block 431 undergoes elastic deformation, so that the button 432 presses against the adjustment switch. When the external force disappears, the connecting block 431 returns to its original deformation, so as to drive the button 432 to move away from the adjustment switch.

[0054] Reference Figure 2 , Figure 4 and Figure 6 A sealing membrane 6 is fixedly installed on the housing 1 to waterproof and seal the control groove 14. The sealing membrane 6 has a certain elasticity and is pressed against the fixing plate 42 and the button 432. By making the sealing membrane 6 elastic, the user can operate the control component 4 through the sealing membrane 6 to adjust the sensor parameters. At the same time, when adjusting the sensor parameters, water is blocked outside the housing 1 by the sealing membrane 6, thereby further improving the waterproofness of the sensor.

[0055] Reference Figure 1 and Figure 6To facilitate the fixing of the sensor, multiple sets of mounting holes 16 are fixedly opened on the housing 1. By isolating the mounting holes 16 from the placement groove 11, the probability of water entering the mounting holes 16 and entering the interior of the housing 1 is reduced.

[0056] The working principle of this application embodiment is as follows:

[0057] The measuring circuit board 3, laser emitter 31, laser receiver 32, and bracket 2 are assembled into a whole and snapped into the placement groove 11. Since the housing 1 is an integrated structure, the housing 1 has good waterproof performance. Then, the light-transmitting sheet 5 is fixedly installed in the stepped groove 12 to waterproof and seal the placement groove 11. The stepped groove 12 can also block water accumulation, reducing the probability of water entering the surface of the light-transmitting sheet 5. At the same time, the drainage groove 13 drains the water on the light-transmitting sheet 5 in time, thereby reducing the amount of water accumulation in the gap between the placement groove 11 and the light-transmitting sheet 5, reducing the probability of water entering the interior of the housing 1, and improving the service life of the laser sensor.

[0058] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A laser proximity sensor, characterized in that: The device includes an integrated housing (1), on which a placement slot (11) is provided for placing a measurement circuit board (3), a laser emitter (31) and a laser receiver (32). At the end of the placement slot (11) away from the bottom, a stepped groove (12) is provided for attaching a light-transmitting sheet (5). The depth of the stepped groove (12) is greater than the thickness of the light-transmitting sheet (5) and reduces the probability of water accumulation entering the surface of the light-transmitting sheet (5). A drainage groove (13) is provided on the housing (1) to facilitate the timely drainage of water accumulated on the surface of the light-transmitting sheet (5).

2. The laser proximity sensor according to claim 1, characterized in that: The light-transmitting sheet (5) is inclined and the inclination angle is related to the detection distance. Waterproof sealant is provided at the connection between the light-transmitting sheet (5) and the stepped groove (12).

3. The laser proximity sensor according to claim 1, characterized in that: The housing (1) has a control groove (14) and a control component (4) electrically connected to the measuring circuit board (3) is provided in the control groove (14). The housing (1) has a sealing film (6) for waterproof sealing of the control groove (14) and the sealing film (6) has a certain elasticity.

4. The laser proximity sensor according to claim 3, characterized in that: The control component (4) includes: The control board (41) is bolted into the control slot (14) and electrically connected to the measuring circuit board (3); A fixing plate (42) is mounted on a control plate (41); Buttons (43), multiple sets of the buttons (43) are disposed on the fixed plate (42) and used to press the adjustment switch on the control plate (41).

5. The laser proximity sensor according to claim 4, characterized in that: The button component (43) includes: A connecting block (431) is provided on the side wall of the fixing plate (42), and the connecting block (431) can undergo elastic deformation; A button (432) is provided on a connecting block (431). When the button (432) approaches the regulating switch under external force, the connecting block (431) undergoes elastic deformation.

6. The laser proximity sensor according to claim 1, characterized in that: The housing (1) is provided with a bracket (2) for easy installation of the lens (24), the bracket (2) comprising: The frame (21) is set in the placement slot (11) and locked to the measuring circuit board (3). The frame (21) has a mounting slot (211) for easy installation of the lens (24). A light guide tube (22) is mounted on the frame (21) and sealed to the laser emitter (31); A focusing tube (23) is mounted on a frame (21) and sealed to a laser receiver (32). The focusing tube (23) has a conical structure and its diameter is smaller the closer it is to the laser receiver (32).

7. The laser proximity sensor according to claim 6, characterized in that: The mounting slot (211) is provided with two sets of lenses (24), which correspond to the laser emitter (31) and the laser receiver (32) respectively. The mounting slot (211) is provided with a baffle (212), which divides the mounting slot (211) into two independent chambers.

8. The laser proximity sensor according to claim 1, characterized in that: A threaded plug (7) that is connected to the measuring circuit board (3) is fixedly installed on the housing (1), and the threaded plug (7) is sealed to the housing (1).

9. The laser proximity sensor according to claim 1, characterized in that: The housing (1) has multiple sets of mounting holes (16), which are isolated from the placement groove (11).

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