Multilayer protection type photoelectric induction sensor

Abstract

The utility model relates to the technical field of sensors, and particularly discloses a multi-layer protection type photoelectric induction sensor which comprises a support, one end of the support is fixedly connected with a fixing frame, a sliding groove is formed in the fixing frame, a screw rod is rotationally connected in the sliding groove, the outer surface of the screw rod is in threaded connection with a sliding seat, and the sliding seat is in threaded connection with the fixing frame. One side of the sliding seat is slidably connected to the interior of the sliding groove, the upper side of the fixing frame is fixedly connected with a first power assembly, one end of the sliding seat is fixedly connected with a fixing block, a second motor drives a disc to rotate, the disc drives a sleeve to rotate, the sleeve drives an arc-shaped scraper to rotate, and the arc-shaped scraper slowly moves on the sensor lens. Water drops left on the sensor lens can be quickly cleaned, the sensor lens does not need to be shielded by the water drops, it is ensured that signals are accurately and stably received, the cleaning efficiency of the sensor lens is improved, the automatic cleaning process is achieved, and a sensor can stably work and use for a long time.

Description

Technical Field

[0001] The utility model relates to the technical field of sensors, in particular to a multi-layer protective photoelectric induction sensor. Background Art

[0002] The photoelectric liquid level sensor works based on the principle of reflection and refraction of light at the interface of two different media. The product contains a near-infrared light-emitting diode and a photosensitive receiver. When the liquid submerges the lens of the photoelectric liquid level switch, the light is refracted into the liquid, so that the receiver cannot receive or can only receive a small amount of light. By sensing this change in working condition, the receiver can drive the internal electrical switch, thereby activating an external alarm or control circuit.

[0003] For example, a Chinese patent with publication number CN213021828U discloses a photoelectric liquid level sensor, including a water tank and a new photoelectric liquid level sensor installed at the bottom of the water tank, a conical lens is fixedly installed inside a shell, a fastening bolt fixes the wire inside the shell, a waterproof film is arranged on the outside of the conical lens, an infrared light-emitting diode and a photosensitive receiver are fixedly arranged inside the shell, the infrared light-emitting diode and the photosensitive receiver are electrically connected to the wire respectively, a conical sealing groove is opened at the position where the water tank overlaps with the shell, a rubber sealing ring is fixedly arranged at the position of the shell corresponding to the conical sealing groove, and a buffer pad is fixedly arranged at the bottom of the conical sealing groove.

[0004] The above-mentioned method of installing a waterproof film outside the conical lens can prevent water droplets from gathering on the surface of the conical lens and affecting signal reception. However, the waterproof film immersed in liquid for a long time may still face the risk of falling off. Once it falls off, the conical lens may still be attached to water droplets, which will undoubtedly have a potential impact on the performance of the sensor. In addition, the photoelectric liquid level sensor is more troublesome to install in a transparent container. It is necessary to open a through hole on the surface of the transparent container and then bury the photoelectric liquid level sensor. The installation is difficult. Although a rubber sealing ring is used for sealing, water leakage may still occur after long-term use. More importantly, once the installation position of the photoelectric liquid level sensor is determined, it is difficult to adjust according to actual needs or changes in the monitoring position, which limits the flexibility and adaptability of the sensor, making it difficult to achieve the best effect in some complex or changeable monitoring environments. Utility Model Content

[0005] The purpose of the utility model is to provide a multi-layer protective photoelectric induction sensor to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides a multi-layer protective photoelectric sensing sensor, comprising a bracket, one end of the bracket is fixedly connected to a fixing frame, a sliding groove is opened inside the fixing frame, a screw is rotatably connected inside the sliding groove, the outer surface of the screw is threadedly connected to a sliding seat, one side of the sliding seat is slidably connected to the inside of the sliding groove, the upper side of the fixing frame is fixedly connected to a first power component, one end of the sliding seat is fixedly connected to a fixing block, one side of the fixing block is fixedly connected to a sensor body, an end of the sensor body away from the sliding seat is fixedly connected to a sensor lens, an outer surface of the sensor lens is bonded and connected to an arc scraper, a second power component is provided on a side of the sliding seat close to the arc scraper, a fixing component is provided between the second power component and the arc scraper, a marking component is provided on one side of the fixing frame, one side of the marking component is fixedly connected to the sliding seat and is slidably connected to the sliding groove, and an end of the bracket away from the sensor lens is fixedly connected to a fixed frame component;

[0007] The sensor body is composed of a corrosion-resistant alloy layer, a thermal barrier coating, and an anti-corrosion coating. One side of the corrosion-resistant alloy layer is fixedly connected to one side of the sensor lens. The thermal barrier coating is applied on the outside of the corrosion-resistant alloy layer, and the anti-corrosion coating is applied on the outside of the thermal barrier coating.

[0008] Furthermore, the first power assembly includes a frame, the frame is fixedly connected to one end of the fixed frame, the one end of the frame is fixedly connected to a first motor, the output end of the first motor is fixedly connected to a first gear, one side of the first gear is meshingly connected to a second gear, the second gear is fixedly connected to a side of the screw extending out of the fixed frame, and the first gear and the second gear are both rotatably connected above the fixed frame.

[0009] Furthermore, the second power assembly includes a second motor, the second motor is fixedly connected to the inside of the slide, the output end of the second motor is fixedly connected to a disc, the disc is rotatably connected to the inside of the slide, one end of the disc is fixedly connected to a sleeve, one side of the sleeve extends out of the slide sleeve and slides outside the fixed block, and the arc scraper is fixedly connected to the sleeve through a fixed assembly.

[0010] Furthermore, a guide groove is provided inside the sleeve, a slider is slidably connected inside the guide groove, and the slider is fixedly connected to the outer surface of the fixed block.

[0011] Furthermore, the fixing assembly includes a slot, which is opened on both sides of one end of the sleeve, and an insert is inserted into the slot, and one end of the insert is fixedly connected to one end of the arc scraper.

[0012] Furthermore, both sides of the sleeve are fixedly connected with edge blocks, the inside of the edge block is fixedly connected with a spring, one end of the spring is fixedly connected with a positioning block, one side of the positioning block is slidably connected to the edge block, a positioning hole is provided on the side of the insert away from the arc scraper, one side of the positioning block is movably connected to the positioning hole, a pull rod is fixedly connected to the inner side of the spring on the positioning block, one side of the pull rod is slidably connected to the edge block, and the end of the pull rod away from the positioning block is fixedly connected to the pull block.

[0013] Furthermore, the marking component includes an extension groove, which is opened on the inner walls of both sides of the slide groove, and an extension block is slidably connected inside the extension groove, one end of the extension block is fixedly connected to one end of the slide seat, one end of the extension block is fixedly connected to an infrared laser, and a scale is fixedly connected to the side of the bracket close to the infrared laser.

[0014] Furthermore, the fixed frame assembly includes a stud, which is threadedly connected to the fixed frame, one end of the stud is rotatably connected to the fixed frame plate through a bearing, the other end of the stud is fixedly connected to a torsion wheel, both sides of one end of the fixed frame plate are fixedly connected to guide rods, and one side of the guide rod is slidably connected to the top frame plate.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] Firstly, in the utility model, an arc scraper is installed at the sensor lens, the arc scraper is fixed on the sleeve through a fixing assembly, and the sleeve is connected to the disk, and the disk is connected to the second motor. When the sensor lens needs to be cleaned, the second motor drives the disk to rotate, the disk drives the sleeve to rotate, and the sleeve drives the arc scraper to rotate, so that the arc scraper slowly moves on the sensor lens, which can quickly clean up the residual water droplets on the sensor lens, and there is no need to worry about the sensor lens being blocked by water droplets, thereby ensuring accurate and stable reception of signals, improving the cleaning efficiency of the sensor lens, and realizing an automated cleaning process, so that the sensor can work and be used stably for a long time.

[0017] Secondly, in the utility model, the photoelectric sensor is installed on the fixed frame of the bracket, the bracket is hung on the transparent container, the twist wheel is rotated to move the stud, the stud drives the fixed frame plate to move, the fixed frame plate is abutted against the transparent container, and the bracket is fixed on the transparent container, so that the photoelectric sensing sensor can be quickly installed, the installation efficiency is improved, and the difficulty of installation work is reduced. Since there is no need to drill a hole in the transparent container, there is no need to worry about water leakage in the later stage.

[0018] Thirdly, in the utility model, by fixing the first motor on the fixed frame, the first motor drives the first gear to rotate, the first gear drives the second gear to rotate, the second gear drives the screw to rotate, the screw rotates in the slide groove of the fixed frame, and the slide seat on the screw slides in the slide groove, which can drive the photoelectric sensor to move. It can be adjusted according to actual needs or monitoring positions before installation, thereby improving the flexibility of the photoelectric sensor. When the slide seat moves, the infrared laser moves accordingly, and the laser emitted by the infrared laser passes through a transparent container without liquid injected to illuminate the scale of the bracket for marking, which is convenient for the installer to adjust. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0020] Figure 2 This is a schematic diagram of the side view structure of the bracket in the utility model;

[0021] Figure 3 For the utility model Figure 1 A schematic diagram of the enlarged structure at point A;

[0022] Figure 4 For the utility model Figure 2 A schematic diagram of the enlarged structure at B;

[0023] Figure 5 This is a schematic diagram of the structure in which the fixing block and the sleeve are separated in the utility model;

[0024] Figure 6 For the utility model Figure 5 A schematic diagram of the enlarged structure at C;

[0025] Figure 7 This is a schematic diagram of the connection structure between the arc-shaped scraper and the insert in the utility model;

[0026] Figure 8 This is a schematic diagram of the local structure of the bracket in the utility model;

[0027] Fig. 9 This is a schematic diagram of the structure of the sensor main body layer in the utility model.

[0028] In the figure: 1, bracket; 2, fixing frame; 3, slide groove; 4, screw; 5, slide seat; 6, fixing block; 7, sensor lens; 71, sensor body; 711, corrosion-resistant alloy layer; 712, thermal barrier coating; 713, anti-corrosion coating; 8, first power assembly; 81, frame; 82, first motor; 83, first gear; 84, second gear; 9, arc scraper; 10, second power assembly; 101, second motor; 102, disc; 103, casing; 104. Guide groove; 105. Slider; 11. Fixing assembly; 111. Slot; 112. Insert; 113. Positioning block; 114. Positioning hole; 115. Edge block; 116. Spring; 117. Pull rod; 118. Pull block; 12. Marking assembly; 121. Extension block; 122. Extension groove; 123. Infrared laser; 124. Scale; 16. Fixed frame assembly; 161. Fixed frame plate; 162. Stud; 163. Torsion wheel; 164. Guide rod. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] See also Figure 1-Figure 9In the embodiment of the utility model, a multi-layer protective photoelectric induction sensor includes a bracket 1, one end of the bracket 1 is fixedly connected to a fixed frame 2, a slide groove 3 is provided inside the fixed frame 2, a screw rod 4 is rotatably connected inside the slide groove 3, a slide seat 5 is threadedly connected to the outer surface of the screw rod 4, one side of the slide seat 5 is slidably connected to the inside of the slide groove 3, a first power assembly 8 is fixedly connected to the upper side of the fixed frame 2, a fixed block 6 is fixedly connected to one end of the slide seat 5, a sensor body 71 is fixedly connected to one side of the fixed block 6, an infrared light emitting diode and a photosensitive receiver are fixed in the sensor body 71, the infrared light emitting diode and the photosensitive receiver are electrically connected to the wire respectively, a sensor lens 7 is fixedly connected to one end of the sensor body 71 away from the slide seat 5, an arc scraper 9 is fitted and connected to the outer surface of the sensor lens 7, a second power assembly 10 is provided on the side of the slide seat 5 close to the arc scraper 9, a fixing assembly 11 is provided between the second power assembly 10 and the arc scraper 9, a marking assembly 12 is provided on one side of the fixed frame 2, one side of the marking assembly 12 is fixedly connected to the slide seat 5, and is slidably connected to the slide groove 3, The end of the bracket 1 away from the sensor lens 7 is fixedly connected with a fixed frame assembly 16. The sensor body 71 is composed of a corrosion-resistant alloy layer 711, a thermal barrier coating 712, and an anti-corrosion coating 713. One side of the corrosion-resistant alloy layer 711 is fixedly connected to one side of the sensor lens 7. The thermal barrier coating 712 is applied on the outside of the corrosion-resistant alloy layer 711, and the anti-corrosion coating 713 is applied on the outside of the thermal barrier coating 712. The corrosion-resistant alloy layer 711 is made of an alloy material with high corrosion resistance, such as 316L stainless steel or titanium alloy. The main function is to provide basic corrosion resistance and prevent corrosion in the external environment. The thermal barrier coating 712 is located on the corrosion-resistant alloy layer 711 and is made of a ceramic material with high melting point, high hardness, high heat resistance and good thermal insulation performance, such as aluminum oxide, zirconium oxide, etc. The main function of the thermal barrier coating 712 is to reduce the temperature of the sensor housing, improve high temperature resistance, and protect internal sensitive components from high temperature damage. A layer of anti-corrosion coating 713, such as fluorocarbon coating, polytetrafluoroethylene coating, etc., is coated on the thermal barrier coating 712 to prevent corrosive media.

[0031] See also Figure 1The first power assembly 8 includes a frame 81, the frame 81 is fixedly connected to one end of the fixed frame 2, one end of the frame 81 is fixedly connected to a first motor 82, the output end of the first motor 82 is fixedly connected to a first gear 83, one side of the first gear 83 is meshedly connected to a second gear 84, the second gear 84 is fixedly connected to a side of the screw 4 extending out of the fixed frame 2, and the first gear 83 and the second gear 84 are both rotatably connected above the fixed frame 2; by setting the first power assembly 8, the first motor 82 is fixed to the fixed frame 2 through the frame 81, the first motor 82 drives the first gear 83 to rotate, the first gear 83 drives the second gear 84 to rotate, and the second gear 84 drives the screw 4 to rotate, so that the slide 5 can slide on the fixed frame 2, and the position of the photoelectric liquid level sensor is adjusted, so as to facilitate the monitoring of the liquid water level in the transparent container.

[0032] See also Figure 3 and Figure 5 The second power assembly 10 includes a second motor 101, which is fixedly connected to the inside of the slide 5. The output end of the second motor 101 is fixedly connected to a disc 102, which is rotatably connected to the inside of the slide 5. One end of the disc 102 is fixedly connected to a sleeve 103, one side of the sleeve 103 extends out of the slide 5 and is slidably sleeved outside the fixed block 6. The arc scraper 9 is fixedly connected to the sleeve 103 through a fixing assembly 11. A guide groove 104 is opened inside the sleeve 103, and a slider 105 is slidably connected inside the guide groove 104. The slider 10 5 is fixedly connected to the outer surface of the fixed block 6; by setting the second power assembly 10, the second motor 101 drives the disc 102 to rotate, the disc 102 drives the sleeve 103 to rotate, the sleeve 103 drives the arc scraper 9 to rotate, the arc scraper 9 moves on the sensor lens 7, and the water drops on the sensor lens 7 can be quickly cleaned, and by providing a guide groove 104 in the sleeve 103, a slider 105 is fixed outside the fixed block 6, and the slider 105 slides in the guide groove 104, the contact area between the sleeve 103 and the fixed block 6 is increased, so that the sleeve 103 can rotate stably.

[0033] See also Figure 6-7The fixing component 11 includes a slot 111, which is provided on both sides of one end of the sleeve 103, and an insert 112 is inserted inside the slot 111, and one end of the insert 112 is fixedly connected to one end of the arc scraper 9. Both sides of the sleeve 103 are fixedly connected with edge blocks 115, and a spring 116 is fixedly connected inside the edge block 115. One end of the spring 116 is fixedly connected with a positioning block 113, and one side of the positioning block 113 is slidably connected to the edge block 115. A positioning hole 114 is provided on the side of the insert 112 away from the arc scraper 9, and one side of the positioning block 113 is movably connected to the positioning hole 114. A pull rod 117 is fixedly connected to the inner side of the spring 116 on the positioning block 113, and one side of the pull rod 117 is slidably connected to the edge block 115. The pull rod 117 A pull block 118 is fixedly connected to the end away from the positioning block 113; by opening a slot 111 on the sleeve 103, the arc scraper 9 is connected to the insertion strip 112, and one side of the insertion strip 112 is inserted into the slot 111, so that the arc scraper 9 can be installed on the sleeve 103, and the side blocks 115 are fixed on both sides of the sleeve 103. Before the insertion strip 112 is inserted into the slot 111, the pull block 118 drives the pull rod 117 to move, and the pull rod 117 drives the positioning block 113 to move, and the positioning block 113 pushes the spring 116 to deform. After the insertion sleeve is inserted into the slot 111, the pull block 118 is released, and the spring 116 is reset. At this time, the positioning block 113 is reset and inserted into the positioning hole 114 of the insertion block, so that the arc scraper 9 is fixed to the sleeve 103, and it is also convenient for the disassembly and maintenance of the arc scraper 9.

[0034] See also Figure 1 and Figure 4 The marking component 12 includes an extension groove 122, and the extension groove 122 is provided on the inner walls of both sides of the slide 3. An extension block 121 is slidably connected inside the extension groove 122. One end of the extension block 121 is fixedly connected to one end of the slide 5, and one end of an extension block 121 is fixedly connected to an infrared laser 123. A scale 124 is fixedly connected to one side of the bracket 1 close to the infrared laser 123. By setting the marking component 12, when no solution is injected into the transparent container, the first motor 82 drives the slide 5 to slide, and the extension block 121 slides in the extension groove 122, so that the extension block 121 drives the infrared laser 123 to move, and the light generated by the infrared laser 123 passes through the transparent container, and the light is irradiated on the scale 124, which can facilitate the staff to know the installation position of the photoelectric liquid level sensor. It should be noted that this marking component 12 is suitable for transparent containers.

[0035] See also Figure 8The fixed frame assembly 16 includes a stud 162, which is threadedly connected to the fixed frame 2, one end of the stud 162 is rotatably connected to the fixed frame plate 161 through a bearing, and the other end of the stud 162 is fixedly connected to a twist wheel 163, and both sides of one end of the fixed frame plate 161 are fixedly connected to guide rods 164, and one side of the guide rod 164 is slidably connected to the top frame plate; by setting the fixed frame assembly 16, after the bracket 1 is hung on the transparent container, the twist wheel 163 is rotated to drive the stud 162 to rotate and move, so that the fixed frame plate 161 moves toward the transparent container, and the fixed frame plate 161 moves horizontally under the action of the guide rod 164, so that the bracket 1 can be fixed on the transparent container.

[0036] The working principle of the utility model is: the bracket 1 is installed on the side of the transparent container, the twist wheel 163 is rotated to move the stud 162, the stud 162 drives the fixed frame plate 161 to move, the fixed frame plate 161 is abutted against the transparent container, and the bracket 1 is fixed on the transparent container, so that the photoelectric sensing sensor can be quickly installed, the installation efficiency is improved, and the difficulty of installation work is reduced. Then, the first motor 82 is used to drive the first gear 83 to rotate, the first gear 83 drives the second gear 84 to rotate, and the second gear 84 drives the screw 4 to rotate, so that the screw 4 rotates in the slide groove 3 of the fixed frame 2, and the slide 5 on the screw 4 slides in the slide groove 3, which can drive the photoelectric sensor to move, and adjust according to the actual needs or monitoring position before installation. During the movement of the slide 5, the extension block 121 connected to the slide 5 slides in the extension groove 122 of the slide groove 3, so that the movement of the slide 5 is more stable, and at the same time, the infrared laser 123 moves with the photoelectric liquid level sensor, and the infrared laser 123 emits The laser light passes through the transparent container without liquid injected, and the light is irradiated on the scale 124 of the bracket 1 for marking. The installer can know the approximate installation position of the infrared laser 123, which is convenient for the installer to adjust. When the sensor lens 7 needs to be cleaned, the second motor 101 drives the disc 102 to rotate, the disc 102 drives the sleeve 103 to rotate, and the sleeve 103 drives the arc scraper 9 to rotate, so that the arc scraper 9 slowly moves on the sensor lens 7, which can quickly clean up the residual water droplets on the sensor lens 7. There is no need to worry about the sensor lens 7 being blocked by water droplets, ensuring accurate and stable signal reception, so that the sensor can work and use stably for a long time. When the arc scraper 9 needs to be replaced, the pull block 118 drives the pull rod 117 to move, and the pull rod 117 drives the positioning block 113 to move away from the positioning hole 114. At this time, the insert 112 is moved outward to separate the insert 112 from the slot 111, and the arc scraper 9 can be removed and replaced.

Claims

1. A multi-layer protective photoelectric sensor, comprising a bracket, characterized in that: One end of the bracket is fixedly connected to a fixing frame, and a sliding groove is provided inside the fixing frame, and a screw is rotatably connected to the inside of the sliding groove, and the outer surface of the screw is threadedly connected to a sliding seat, and one side of the sliding seat is slidably connected to the inside of the sliding groove, and the upper side of the fixing frame is fixedly connected to a first power assembly, one end of the sliding seat is fixedly connected to a fixing block, one side of the fixing block is fixedly connected to a sensor body, and an end of the sensor body away from the sliding seat is fixedly connected to a sensor lens, and an outer surface of the sensor lens is bonded and connected with an arc scraper, a second power assembly is provided on a side of the sliding seat close to the arc scraper, and a fixing assembly is provided between the second power assembly and the arc scraper, a marking assembly is provided on one side of the fixing frame, one side of the marking assembly is fixedly connected to the sliding seat and is slidably connected to the sliding groove, and an end of the bracket away from the sensor lens is fixedly connected to a fixed frame assembly; The sensor body is composed of a corrosion-resistant alloy layer, a thermal barrier coating, and an anti-corrosion coating. One side of the corrosion-resistant alloy layer is fixedly connected to one side of the sensor lens. The thermal barrier coating is applied on the outside of the corrosion-resistant alloy layer, and the anti-corrosion coating is applied on the outside of the thermal barrier coating.

2. A multi-layer protective photoelectric sensor according to claim 1, characterized in that: The first power assembly includes a frame, which is fixedly connected to one end of a fixed frame, a first motor is fixedly connected to one end of the frame, a first gear is fixedly connected to an output end of the first motor, a second gear is meshedly connected to one side of the first gear, the second gear is fixedly connected to a side of a screw rod extending out of the fixed frame, and the first gear and the second gear are both rotatably connected above the fixed frame.

3. The multi-layer protective photoelectric sensor according to claim 1, characterized in that: The second power assembly includes a second motor, which is fixedly connected to the inside of the slide, and the output end of the second motor is fixedly connected to a disc, and the disc is rotatably connected to the inside of the slide, one end of the disc is fixedly connected to a sleeve, one side of the sleeve extends out of the slide sleeve and slides outside the fixed block, and the arc scraper is fixedly connected to the sleeve through a fixed assembly.

4. The multi-layer protective photoelectric sensor according to claim 3, characterized in that: A guide groove is provided inside the sleeve, a slider is slidably connected inside the guide groove, and the slider is fixedly connected to the outer surface of the fixed block.

5. The multi-layer protective photoelectric sensor according to claim 3, characterized in that: The fixing assembly comprises a slot, which is opened on both sides of one end of the sleeve, and an inserting strip is inserted inside the slot, and one end of the inserting strip is fixedly connected to one end of the arc scraper.

6. The multi-layer protective photoelectric sensor according to claim 5, characterized in that: Both sides of the sleeve are fixedly connected with side blocks, the inside of the side block is fixedly connected with a spring, one end of the spring is fixedly connected with a positioning block, one side of the positioning block is slidably connected to the side block, a positioning hole is opened on the side of the insert away from the arc scraper, and one side of the positioning block is movably connected to the positioning hole.

7. The multi-layer protective photoelectric sensor according to claim 6, characterized in that: A pull rod is fixedly connected to the inner side of the spring on the positioning block, one side of the pull rod is slidably connected to the side block, and one end of the pull rod away from the positioning block is fixedly connected to the pull block.

8. The multi-layer protective photoelectric sensor according to claim 1, characterized in that: The marking component includes an extension groove, which is opened on the inner walls of both sides of the slide groove. An extension block is slidably connected inside the extension groove, one end of the extension block is fixedly connected to one end of the slide seat, one end of the extension block is fixedly connected to an infrared laser, and a scale is fixedly connected to the side of the bracket close to the infrared laser.

9. The multi-layer protective photoelectric sensor according to claim 1, characterized in that: The fixed frame assembly includes a stud, which is threadedly connected to the fixed frame, one end of the stud is rotatably connected to the fixed frame plate through a bearing, the other end of the stud is fixedly connected to a torsion wheel, both sides of one end of the fixed frame plate are fixedly connected to guide rods, and one side of the guide rod is slidably connected to the top frame plate.

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