High-temperature-resistant photoelectric liquid level sensor

Abstract

The invention relates to the technical field of liquid level sensors, and particularly discloses a high-temperature-resistant photoelectric liquid level sensor which comprises a mounting plate, a photoelectric liquid level sensor body mounted in a protective shell, cooling fins symmetrically mounted on two sides in the protective shell, a protective cover movably connected to one side of the protective shell, and wires symmetrically and fixedly connected to the bottom of the photoelectric liquid level sensor. Connecting lugs are slidably connected to the two sides of the mounting plate, limiting assemblies are installed on the two sides of the connecting lugs, an assembling base is in threaded connection with the bottom of the protective shell, and a fixing assembly is installed in the assembling base. By the adoption of the structure, falling or displacement caused by vibration, looseness and the like in the long-term use process of the wire can be effectively prevented, so that the stability and reliability of the sensor are improved, and it can be ensured that the photoelectric liquid level sensor accurately receives and transmits signals through stable wire connection; measurement errors caused by loosening or falling off of the wires are avoided, and therefore the measurement precision and accuracy are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid level sensors, and in particular to a high-temperature resistant photoelectric liquid level sensor. Background Art

[0002] A photoelectric liquid level sensor is a device used to measure the liquid level or height. It converts the position of the liquid into an electrical signal for output to achieve precise monitoring of the liquid height. It is widely used in various industrial, commercial, and household environments, such as water towers, fuel tanks, reservoirs, chemical reactors, etc. Common types of electrical liquid level sensors include float type, capacitive type, ultrasonic type, pressure type, and radar type, etc. The float type sensor triggers a switch or changes the resistance value by the up and down floating of the float; the capacitive sensor detects the liquid level by using the change of capacitance; the ultrasonic sensor emits ultrasonic waves and receives the reflected signals, and determines the liquid level by calculating the time difference; the pressure type sensor calculates the liquid level by measuring the pressure generated by the liquid on the bottom of the sensor; the radar type sensor emits electromagnetic waves and receives its reflected signals, which is suitable for long-distance and high-precision measurements.

[0003] The utility model with the publication number "CN215217751U" is a non-contact photoelectric liquid level sensor, which includes: a housing assembly, a PCB board, an opposed phototransistor assembly, and a wire gasket. The PCB board is arranged inside the housing assembly. The opposed phototransistor assembly includes: a transmitting opposed phototransistor and a receiving opposed phototransistor. The transmitting opposed phototransistor is welded on the PCB. The receiving opposed phototransistor is welded on the PCB and is located on one side of the transmitting opposed phototransistor. One end of the wire gasket is welded on the PCB, and the other end of the wire gasket is arranged on the housing assembly. An inlet is arranged on the wire gasket, and the wire is welded on the PCB through the inlet. This enables the existing photoelectric liquid level sensor not to be affected by scale generated when the prism is immersed in the liquid.

[0004] Although the above utility model can enable the existing photoelectric liquid level sensor not to be affected by scale generated when the prism is immersed in the liquid, when the wire is subjected to external forces, such as vibration, pulling, etc., it is easy to cause the wire to become loose, resulting in the wire falling off from the connection end, which will affect the transmission quality of the sensor signal and even cause signal interruption. Moreover, even if the wire is not completely detached, long-term vibration or pulling will also cause loosening or poor contact at the connection, which will lead to a decrease in the signal transmission quality and affect the measurement accuracy and stability of the sensor. Summary of the Invention

[0005] The object of the present invention is to provide a high-temperature resistant photoelectric liquid level sensor to solve the problems proposed in the above background technology. When the wire is subjected to external force, it is easy to cause the wire to loosen, resulting in the wire falling off from the connection end, affecting the transmission quality of the sensor signal, and even causing signal interruption. Moreover, even if the wire is not completely detached, long-term vibration or pulling will also cause loosening or poor contact at the connection, resulting in a decrease in the signal transmission quality and affecting the measurement accuracy and stability of the sensor.

[0006] To achieve the above object, the present invention provides a high-temperature resistant photoelectric liquid level sensor, which includes a mounting plate. One side of the mounting plate is fixedly connected with a protective shell. Inside the protective shell, a photoelectric liquid level sensor body is installed. On both sides inside the protective shell, heat sinks are symmetrically installed. One side of the protective shell is movably connected with a protective cover. At the bottom of the photoelectric liquid level sensor, wires are symmetrically and fixedly connected. On both sides of the mounting plate, connecting ears are slidably connected. On both sides of the connecting ears, limiting components are installed. At the bottom of the protective shell, an assembly seat is threadedly connected. Inside the assembly seat, a fixing component is installed. The photoelectric liquid level sensor body mainly consists of two parts: a transmitting end and a receiving end. The transmitting end usually includes an infrared light-emitting diode for emitting light; the receiving end includes a photosensitive receiver for receiving the reflected or refracted light. When the sensor is in a waterless state, the light emitted by the light-emitting diode will directly irradiate the lens on the top of the sensor and most of it will be reflected back to the receiver by the lens. At this time, the light intensity received by the receiver is relatively large, and a high-level signal or a corresponding level signal can be output. When the sensor is immersed in the liquid, the light emitted by the light-emitting diode will be refracted into the liquid, resulting in a significant decrease in the light intensity received by the receiver or the receiver not receiving any light at all. At this time, the receiver will output a corresponding change in the level signal, thereby triggering a corresponding control or alarm circuit.

[0007] The fixing component includes an arc-shaped clamping block, a first bidirectional screw rod, a second bidirectional screw rod, a rotating column, a rotating disc and a moving block. A through groove is formed at the bottom of the assembly seat. The arc-shaped clamping blocks are symmetrically and slidably connected inside the through groove. The first bidirectional screw rod and the second bidirectional screw rod are respectively rotatably connected to one side of the assembly seat. The opposite ends of the first bidirectional screw rod and the second bidirectional screw rod are fixedly connected with a rotating column. A rotating disc is fixedly sleeved outside the rotating column. Moving blocks are symmetrically sleeved outside the first bidirectional screw rod and the second bidirectional screw rod. One side of the moving block is fixedly connected with the arc-shaped clamping block. The moving block outside the first bidirectional screw rod is in threaded connection with the first bidirectional screw rod, and the moving block outside the second bidirectional screw rod is in threaded connection with the second bidirectional screw rod. Symmetrical sliding grooves are formed on one side of the assembly seat, and the sliding grooves are communicated with the inside of the through groove. The moving block is slidably connected with the through groove, which can effectively prevent the wire from falling off or shifting due to vibration, loosening, etc. during long-term use, thereby improving the stability and reliability of the sensor. Moreover, the stable wire connection can ensure that the photoelectric liquid level sensor accurately receives and transmits signals, avoiding measurement errors caused by wire loosening or falling off, thereby improving the measurement accuracy and precision.

[0008] Further, an installation block is fixedly connected to one side inside the through groove. A rotating groove is formed on one side of the installation block. A pressing block is rotatably connected inside the rotating groove. A second return spring is fixedly connected to the bottom of the rotating groove, and the other end of the second return spring is fixedly connected with the pressing block. Tooth blocks are symmetrically and fixedly connected to one end of the pressing block. Annular tooth grooves are symmetrically formed on the outside of the rotating disc. The radian of the annular tooth groove coincides with that of the tooth block, and the tooth block is inserted into the annular tooth groove, which can limit the rotation of the rotating disc, effectively prevent the screw rod from rotating uncontrollably, avoid the accidental change of the wire clamping state caused by the rotation of the first bidirectional screw rod and the second bidirectional screw rod, and ensure the accuracy and stability of the operation.

[0009] Further, the limiting component includes a cavity, a moving plate, a first return spring, a connecting column, a pulling handle and a limiting column. Assembly blocks are fixedly connected to both sides of the connecting ear. A cavity is formed inside the assembly block. A first return spring is fixedly connected to one side inside the cavity, and the other end of the first return spring is fixedly connected with a moving plate. The moving plate is slidably connected with the inside of the cavity. A limiting column is fixedly connected to the other side of the moving plate, and the other end of the limiting column extends out of the assembly block. A connecting column is fixedly connected to one side of the moving plate, and the other end of the connecting column extends out of the assembly block and is fixedly connected with a pulling handle. The first return spring is sleeved outside the connecting column. Fixed seats are symmetrically and fixedly connected to one side of the mounting plate. Limiting holes are symmetrically and equidistantly formed on one side of the fixed seat, and the limiting column is inserted into the limiting hole, which can enable the electric liquid level sensor to flexibly adapt to different installation environments and conditions during the installation process, reduce the installation difficulties caused by inaccurate or changed reserved hole positions, improve the flexibility and adaptability of installation, and simplify the installation process of the sensor. The installer only needs to adjust the position of the connecting ear according to actual needs.

[0010] Furthermore, T-shaped grooves are provided on both sides of the mounting plate. One side of the connecting ear is fixedly connected with a T-shaped block, and the T-shaped block is slidably connected to the T-shaped groove. When the connecting ear drives the T-shaped block to slide in the T-shaped groove, the cooperation between the T-shaped groove and the T-shaped block can provide a stable guidance and support, which helps to enhance the rigidity of the overall structure and prevent deformation or loosening caused by external forces.

[0011] Furthermore, fixing blocks are symmetrically and fixedly connected to both sides of the protective shell. A clamping groove is provided at one end of the fixing block. Clamping blocks are symmetrically and fixedly connected to both sides of the protective cover, and the clamping blocks are clamped with the clamping grooves to ensure a tight connection between the protective shell and the protective cover. This not only improves the structural stability and prevents loosening due to vibration or external forces, but also enhances the sealing performance, effectively preventing external factors such as dust and moisture from invading the inside of the sensor, thereby protecting the sensor from damage.

[0012] Furthermore, an anti-slip pad is glued to the clamping end of the arc-shaped clamping block. Anti-slip bumps are provided on the surface of the anti-slip pad, and the anti-slip pad is made of soft rubber, which can increase the friction between the arc-shaped clamping block and the wire, thus ensuring that the wire is not easily slipped or loosened during the clamping process.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0014] First, in the present invention, press the button block to end the insertion of the tooth block into the annular tooth groove, and then rotate the rotating disk, so that the rotating column drives the first double lead screw and the second double lead screw to rotate. At the same time, the moving blocks are respectively threadedly rotated with the first double lead screw and the second double lead screw to control the sliding of the moving blocks inside the sliding groove, so that the moving blocks drive the arc-shaped clamping blocks to move, and the arc-shaped clamping blocks clamp and fix the wire, which can effectively prevent the wire from falling off or displacing due to vibration, loosening, etc. during long-term use, thereby improving the stability and reliability of the sensor. Moreover, the stable wire connection can ensure that the photoelectric liquid level sensor accurately receives and transmits signals, avoiding measurement errors caused by wire loosening or falling off, thereby improving the measurement accuracy and precision.

[0015] Second, in the present invention, according to the position of the reserved hole on the mounting surface, pull the pull handle, so that the connecting column drives the moving plate and the limiting column to move. The moving plate presses against the first return spring, and the first return spring is compressed. At the same time, the limiting column retracts into the cavity, push the connecting ear, so that the hole on the connecting ear is aligned with the hole on the mounting surface, release the pull handle, and the first return spring resets, and the limiting column pops out and is inserted and fixed with the limiting hole, which can enable the photoelectric liquid level sensor to flexibly adapt to different installation environments and conditions during the installation process, reduce the installation problems caused by inaccurate or changing reserved hole positions, improve the installation flexibility and adaptability, and simplify the installation process of the sensor. The installer only needs to adjust the position of the connecting ear according to the actual needs. Brief Description of the Drawings

[0016] Figure 1 It is a schematic three-dimensional structure diagram of the present invention;

[0017] Figure 2 In the present invention Figure 1 Enlarged view of part A;

[0018] Figure 3 In the present invention Figure 1 Enlarged view of part A;

[0019] Figure 4 In the present invention Figure 1 Enlarged view of part A;

[0020] Figure 5 It is a schematic three-dimensional structure diagram of the other side protective shell in the present invention;

[0021] Figure 6 It is a schematic cross-sectional three-dimensional structure diagram of the assembly seat in the present invention;

[0022] Figure 7 In the present invention Figure 6 Enlarged view of part C;

[0023] Figure 8 It is a schematic cross-sectional three-dimensional structure diagram of the limit component in the present invention.

[0024] In the figure: 1. mounting plate; 2. protective shell; 3. protective cover; 4. heat sink; 5. photoelectric liquid level sensor body; 6. connecting ear; 7. T-shaped groove; 8. T-shaped block; 9. assembly block; 10. fixed seat; 11. limit component; 111. cavity; 112. moving plate; 113. first return spring; 114. connecting column; 115. pull handle; 116. limit column; 12. limit hole; 13. fixed block; 14. engaging block; 15. engaging groove; 16. wire; 17. assembly seat; 18. through groove; 19. fixing component; 191. arc-shaped clamping block; 192. first bidirectional lead screw; 193. second bidirectional lead screw; 194. rotating column; 195. rotating disc; 196. moving block; 20. sliding groove; 21. anti-slip pad; 22. mounting block; 23. rotating groove; 24. pressing block; 25. second return spring; 26. tooth block; 27. annular tooth groove. Detailed Description of the Invention

[0025] Embodiment

[0026] Please refer to Figures 1-8, in the embodiment of the present invention, a high-temperature resistant photoelectric liquid level sensor, mounting plate 1, a protective shell 2 is fixedly connected to one side of the mounting plate 1, a photoelectric liquid level sensor body 5 is installed inside the protective shell 2, heat sinks 4 are symmetrically installed on both sides inside the protective shell 2, a protective cover 3 is movably connected to one side of the protective shell 2, wires 16 are symmetrically and fixedly connected to the bottom of the photoelectric liquid level sensor, connecting ears 6 are slidably connected to both sides of the mounting plate 1, limiting components 11 are installed on both sides of the connecting ears 6, a mounting seat 17 is threadedly connected to the bottom of the protective shell 2, a fixing component 19 is installed inside the mounting seat 17, the photoelectric liquid level sensor body 5 mainly consists of two parts: a transmitting end and a receiving end. The transmitting end usually includes an infrared light-emitting diode for emitting light; the receiving end includes a photosensitive receiver for receiving the reflected or refracted light. When the sensor is in a waterless state, the light emitted by the light-emitting diode will directly irradiate the lens on the top of the sensor and most of it will be reflected back to the receiver by the lens. At this time, the light intensity received by the receiver is relatively large, and a high-level signal or a corresponding level signal can be output. When the sensor is immersed in the liquid, the light emitted by the light-emitting diode will be refracted into the liquid, resulting in a significant decrease in the light intensity received by the receiver or no light received at all. At this time, the receiver will output a corresponding change in the level signal, thereby triggering the corresponding control or alarm circuit;

[0027] The fixing component 19 includes an arc-shaped clamping block 191, a first bidirectional lead screw 192, a second bidirectional lead screw 193, a rotating column 194, a rotating disk 195 and a moving block 196. A through groove 18 is opened at the bottom of the mounting seat 17. Arc-shaped clamping blocks 191 are symmetrically and slidably connected inside the through groove 18. A first bidirectional lead screw 192 and a second bidirectional lead screw 193 are respectively rotatably connected to one side of the mounting seat 17. A rotating column 194 is fixedly connected to the opposite ends of the first bidirectional lead screw 192 and the second bidirectional lead screw 193. A rotating disk 195 is fixedly sleeved on the outside of the rotating column 194. Moving blocks 196 are symmetrically sleeved on the outside of the first bidirectional lead screw 192 and the second bidirectional lead screw 193. One side of the moving block 196 is fixedly connected to the arc-shaped clamping block 191. The moving block 196 on the outside of the first bidirectional lead screw 192 is threadedly connected to the first bidirectional lead screw 192, and the moving block 196 on the outside of the second bidirectional lead screw 193 is threadedly connected to the second bidirectional lead screw 193. Sliding grooves 20 are symmetrically opened on one side of the mounting seat 17. The sliding grooves 20 communicate with the inside of the through groove 18. The moving block 196 is slidably connected to the through groove 18. Press the button 24 to end the insertion of the tooth block 26 into the annular tooth groove 27, and then rotate the rotating disk 195 to drive the first bidirectional lead screw 192 and the second bidirectional lead screw 193 to rotate by the rotating column 194. At the same time, the moving block 196 rotates threadedly with the first bidirectional lead screw 192 and the second bidirectional lead screw 193 respectively, controlling the movement of the moving block 196 inside the sliding groove 20, so that the moving block 196 drives the arc-shaped clamping block 191 to move, and the arc-shaped clamping block 191 clamps and fixes the wire 16.

[0028] Please refer to Figure 7 , on one side inside the through groove 18, there is a fixedly connected mounting block 22. On one side of the mounting block 22, there is a rotating groove 23. Inside the rotating groove 23, there is a rotatably connected pressing block 24. At the bottom of the rotating groove 23, there is a fixedly connected second return spring 25. The other end of the second return spring 25 is fixedly connected to the pressing block 24. At one end of the pressing block 24, there are symmetrically fixedly connected tooth blocks 26. On the outer side of the rotating disc 195, there are symmetrically arranged annular tooth grooves 27. The annular tooth grooves 27 match the radian of the tooth blocks 26. The tooth blocks 26 are inserted into the annular tooth grooves 27. Press the pressing block 24 to make the pressing block 24 rotate. At the same time, one side of the pressing block 24 presses against the second return spring 25, and the second return spring 25 is compressed. At the same time, the pressing block 24 drives the tooth blocks 26 to end the insertion with the annular tooth grooves 27, ending the limit on the rotating disc 195. Release the pressing block 24, the second return spring 25 resets, the pressing block 24 resets, and the pressing block 24 drives the tooth blocks 26 to be inserted into the annular tooth grooves 27.

[0029] Please refer to Figure 8 , the limiting component 11 includes a cavity 111, a moving plate 112, a first return spring 113, a connecting column 114, a pulling handle 115, and a limiting column 116. On both sides of the connecting ear 6, there are fixedly connected assembly blocks 9. Inside the assembly blocks 9, there are cavities 111. On one side inside the cavity 111, there is a fixedly connected first return spring 113. The other end of the first return spring 113 is fixedly connected to the moving plate 112. The moving plate 112 is slidably connected to the inside of the cavity 111. On the other side of the moving plate 112, there is a fixedly connected limiting column 116. The other end of the limiting column 116 extends out of the assembly block 9. On one side of the moving plate 112, there is a fixedly connected connecting column 114. The other end of the connecting column 114 extends out of the assembly block 9 and is fixedly connected to the pulling handle 115. The first return spring 113 is sleeved on the outer side of the connecting column 114. On one side of the mounting plate 1, there are symmetrically fixedly connected fixing seats 10. On one side of the fixing seats 10, there are symmetrically and equidistantly arranged limiting holes 12. The limiting column 116 is inserted into the limiting holes 12. According to the position of the reserved holes on the installation surface, pull the pulling handle 115 to make the connecting column 114 drive the moving plate 112 and the limiting column 116 to move. The moving plate 112 presses against the first return spring 113, and the first return spring 113 is compressed. At the same time, the limiting column 116 retracts into the cavity 111. Push the connecting ear 6 to align the holes on the connecting ear 6 with the holes on the installation surface. Release the pulling handle 115, the return spring resets, and the limiting column 116 pops out and is inserted into the limiting holes 12 for fixing.

[0030] Please refer to Figure 2 and Figure 8, T-shaped grooves 7 are provided on both sides of the mounting plate 1. One side of the connecting ear 6 is fixedly connected with a T-shaped block 8, and the T-shaped block 8 is slidably connected with the T-shaped groove 7. After the limiting column 116 and the limiting hole 12 finish the insertion, push the connecting ear 6 to drive the T-shaped block 8 to slide inside the T-shaped groove 7.

[0031] Please refer to Figure 1 and Figure 3 , fixed blocks 13 are symmetrically and fixedly connected to both sides of the protective shell 2. A clamping groove 15 is provided at one end of the fixed block 13. Clamping blocks 14 are symmetrically and fixedly connected to both sides of the protective cover 3. The clamping blocks 14 are clamped with the clamping grooves 15. Combine one side of the protective cover 3 and the protective shell 2 to make the clamping blocks 14 and the clamping grooves 15 on one side of the fixed block 13 engage, completing the installation of the protective cover 3.

[0032] Please refer to Figure 5 , an anti-slip pad 21 is adhesively bonded to the clamping end of the arc-shaped clamping block 191. Anti-slip convex points are provided on the surface of the anti-slip pad 21, and the material of the anti-slip pad 21 is soft rubber. By providing the anti-slip pad 21, the friction between the arc-shaped clamping block 191 and the wire 16 can be increased, thus ensuring that the wire 16 is not easy to slip or loosen during the clamping process

[0033] The working principle of the present invention is as follows: First, according to the position of the reserved holes on the installation surface, pull the pull handle 115 to drive the connecting column 114 to drive the moving plate 112 and the limiting column 116 to move. The moving plate 112 presses against the first return spring 113, and the first return spring 113 is compressed. At the same time, the limiting column 116 retracts into the cavity 111. Push the connecting ear 6 to align the hole on the connecting ear 6 with the hole on the installation surface. Release the pull handle 115, and the return spring resets. The limiting column 116 pops out and is inserted and fixed with the limiting hole 12. Install the protective shell 2 on the installation surface through the connecting ear 6. Then install the photoelectric liquid level sensor body 5 inside the protective shell 2. Threadedly connect the assembly seat 17 to the bottom of the protective shell 2. At the same time, the wire 16 passes through the assembly seat 17. Press the button 24 to finish the insertion of the tooth block 26 and the annular tooth groove 27. Then rotate the rotating disk 195 to drive the rotating column 194 to drive the first bidirectional lead screw 192 and the second bidirectional lead screw 193 to rotate. At the same time, the moving block 196 is threadedly rotated with the first bidirectional lead screw 192 and the second bidirectional lead screw 193 respectively, controlling the moving block 196 to slide inside the chute 20, so that the moving block 196 drives the arc-shaped clamping block 191 to move, and the arc-shaped clamping block 191 clamps and fixes the wire 16;

[0034] The present invention can effectively prevent the wire 16 from falling off or displacing due to vibration, loosening, etc. during long-term use, thereby improving the stability and reliability of the sensor. Moreover, the stable connection of the wire 16 can ensure that the optoelectronic liquid level sensor accurately receives and transmits signals, avoiding measurement errors caused by the loosening or falling off of the wire 16, thereby improving the measurement accuracy and precision.

Claims

1. A high temperature resistant photoelectric liquid level sensor, characterized in that: It comprises a mounting plate, one side of the mounting plate is fixedly connected to a protective shell, a photoelectric liquid level sensor body is installed inside the protective shell, heat sinks are symmetrically installed on both sides of the protective shell, a protective cover is movably connected to one side of the protective shell, wires are symmetrically fixedly connected to the bottom of the photoelectric liquid level sensor, both sides of the mounting plate are slidably connected to connecting ears, both sides of the connecting ears are installed with limit components, the bottom of the protective shell is threadedly connected to an assembly seat, and a fixed component is installed inside the assembly seat; The fixing assembly includes an arc-shaped clamping block, a first bidirectional screw rod, a second bidirectional screw rod, a rotating column, a rotating disk and a moving block. A through groove is provided at the bottom of the assembly seat, and an arc-shaped clamping block is symmetrically and slidingly connected inside the through groove. The first bidirectional screw rod and the second bidirectional screw rod are respectively rotatably connected to one side of the assembly seat, and the first bidirectional screw rod and the second bidirectional screw rod are fixedly connected to the rotating column at the opposite ends. A rotating disk is fixedly sleeved on the outer side of the rotating column, and moving blocks are symmetrically sleeved on the outer sides of the first bidirectional screw rod and the second bidirectional screw rod, and one side of the moving block is fixedly connected to the arc-shaped clamping block.

2. A high temperature resistant photoelectric liquid level sensor according to claim 1, characterized in that: The moving block outside the first bidirectional screw rod is threadedly connected to the first bidirectional screw rod, and the moving block outside the second bidirectional screw rod is threadedly connected to the second bidirectional screw rod.

3. A high temperature resistant photoelectric liquid level sensor according to claim 1, characterized in that: A slide groove is symmetrically provided on one side of the assembly seat, the slide groove is communicated with the inside of the through groove, and the moving block is slidably connected with the through groove.

4. The high temperature resistant photoelectric liquid level sensor according to claim 1, characterized in that: A mounting block is fixedly connected to one side of the through slot, a rotating slot is provided on one side of the mounting block, a pressing block is rotatably connected to the rotating slot, a second return spring is fixedly connected to the bottom of the rotating slot, the other end of the second return spring is fixedly connected to the pressing block, a tooth block is symmetrically fixedly connected to one end of the pressing block, an annular tooth groove is symmetrically provided on the outer side of the rotating disk, the annular tooth groove matches the curvature of the tooth block, and the tooth block and the annular tooth groove are plug-in.

5. The high temperature resistant photoelectric liquid level sensor according to claim 1, characterized in that: The limiting assembly includes a cavity, a movable plate, a first return spring, a connecting column, a handle and a limiting column, both sides of the connecting ear are fixedly connected with an assembly block, a cavity is opened inside the assembly block, one side of the cavity is fixedly connected with a first return spring, the other end of the first return spring is fixedly connected to the movable plate, the movable plate and the cavity are slidably connected, the other side of the movable plate is fixedly connected to the limiting column, the other end of the limiting column extends out of the assembly block, one side of the movable plate is fixedly connected with a connecting column, the other end of the connecting column extends out of the assembly block and is fixedly connected with a handle, and the first return spring is sleeved on the outside of the connecting column.

6. A high temperature resistant photoelectric liquid level sensor according to claim 5, characterized in that: A fixing seat is symmetrically fixedly connected to one side of the mounting plate, and limiting holes are symmetrically and equidistantly arranged on one side of the fixing seat, and the limiting columns are plug-connected with the limiting holes.

7. The high temperature resistant photoelectric liquid level sensor according to claim 1, characterized in that: T-shaped slots are provided on both sides of the mounting plate, a T-shaped block is fixedly connected to one side of the connecting ear, and the T-shaped block is slidably connected to the T-shaped slot.

8. The high temperature resistant photoelectric liquid level sensor according to claim 1, characterized in that: Both sides of the protective shell are symmetrically fixedly connected with fixing blocks, one end of the fixing block is provided with a clamping groove, and both sides of the protective cover are symmetrically fixedly connected with clamping blocks, and the clamping blocks are clamped with the clamping groove.

9. The high temperature resistant photoelectric liquid level sensor according to claim 1, characterized in that: The clamping end of the arc-shaped clamping block is glued with an anti-skid pad, the surface of the anti-skid pad is provided with anti-skid protrusions, and the material of the anti-skid pad is soft rubber.

Images