Magnetic detection module with waterproof shell

Abstract

The invention relates to the field of detection equipment, and discloses a magnetic detection module with a waterproof shell, which comprises a waterproof shell body, the outer wall of the waterproof shell body is coated with a waterproof layer, the bottom surface of the waterproof shell body is provided with a fixing hole, and the inner wall of the fixing hole is fixedly provided with a detection module body. A circuit board is fixed to the inner bottom face of the waterproof shell body, a PLC is fixed to the top face of the circuit board, the detection module body and the circuit board are electrically connected with the PLC, and metal plates are fixed to the front side and the rear side of the circuit board. According to the invention, heat generated by the element can be quickly absorbed through the metal plate and the metal column, the heat is conducted to the outside of the waterproof shell body, and the phase change material filled in the metal shell can generate phase change (for example, the phase change material is changed from a solid state to a liquid state) when absorbing the heat, so that the temperature of the surrounding environment is effectively reduced, and the effects of heat dissipation and temperature control are achieved; and the detection module is ensured to work in a proper temperature range.

Description

Technical Field

[0001] The invention relates to the technical field of detection equipment, in particular to a magnetic detection module with a waterproof shell. Background Art

[0002] A magnetic detection module is a device used to detect magnetic field related parameters (such as magnetic field strength, direction, etc.), and its exterior is wrapped in a waterproof shell. This module usually contains magnetic sensors (such as Hall sensors, magnetoresistive sensors, etc.) and related circuit components (such as amplifiers, signal conditioning circuits, etc.). Its waterproof shell is designed to protect the internal electronic components from the intrusion of moisture, so that it can work normally in a humid environment or an environment that may be exposed to water.

[0003] The Chinese patent with announcement number: CN210275005U, a magnetic detection module with a waterproof shell, is aimed at the problem that the device needs to be used multiple times when detecting water distribution. As time goes by, the device will generate heat. As the temperature rises, it affects the components, and sometimes they are burned, causing the entire device to be unstable and affecting the measurement accuracy. The following solution is now proposed, which includes a main control box, the main control box is electrically connected to a power box and a capacitor box, the main control box and the capacitor box are electrically connected to the same coil, the main control box includes a processor, a detector and a memory, a servo motor is arranged on the bottom inner wall of the main control box, an air intake fan is rotatably installed on the bottom inner wall of the main control box, and the servo motor is electrically connected to the power box.

[0004] In the above scheme, the exhaust fan can be used to quickly cool down the inside of the main control box and prevent dust from burning electrical parts and affecting measurement accuracy. However, it has the following disadvantages: when this magnetic detection module is in use, since there are many heating elements inside the magnetic detection module, the wind will cause part of the heat to circulate inside the shell, making it impossible to effectively absorb and dissipate heat from the heating elements, which can easily cause damage to the original components. Summary of the invention

[0005] The purpose of the present invention is to provide a magnetic detection module with a waterproof shell to solve the problem that when the magnetic detection module is in use, due to the large number of heating elements inside the magnetic detection module, wind will cause part of the heat to circulate inside the shell, thereby failing to effectively absorb and dissipate heat for the heating elements, which may easily lead to damage to the original components.

[0006] In order to achieve the above-mentioned invention object, the present invention adopts the following technical scheme: a magnetic detection module with a waterproof shell, comprising a waterproof shell body, the outer wall of the waterproof shell body is coated with a waterproof layer, the bottom surface of the waterproof shell body is provided with a fixing hole, the inner wall of the fixing hole is fixed with a detection module body, the inner bottom surface of the waterproof shell body is fixed with a circuit board, the top surface of the circuit board is fixed with a PLC controller, the detection module body and the circuit board are electrically connected to the PLC controller, the front and rear sides of the circuit board are fixed with metal plates, two metal shells are fixed between the two metal plates, the interior of the metal shell is filled with phase change material, a metal column is fixed on the metal shell, the left and right sides of the waterproof shell body are provided with through holes, the metal column extends into the through holes, the top surface of the waterproof shell body is provided with a fixing groove, the fixed The inner wall of the fixed groove is rotatably connected with a protective plate through a hinge, the top surface of the protective plate is provided with a mounting hole, the inner wall of the mounting hole is fixed with a fan, the fan is electrically connected to the PLC controller, the fan can accelerate the circulation of air inside the waterproof shell body, so that the flowing air can take away the heat generated by the original parts, the front and rear sides of the waterproof shell body are provided with ventilation holes, the bottom surface of the inner wall of the ventilation hole is provided with a plurality of mounting grooves, a micro motor is fixed with the inner wall of the mounting groove, a rotating plate is fixed at one end of the output shaft of the micro motor, the micro motor and the PLC controller, when ventilation is not needed (such as in a humid environment), the rotating plate can close the ventilation hole to prevent moisture, dust, impurities, etc. from entering the interior of the waterproof shell body through the ventilation hole, while ensuring the internal air pressure and humidity balance, it does not affect the waterproof and protective performance of the waterproof shell body.

[0007] Preferably, a first curved surface is provided on the right side of the inner wall of the air vent, and a second curved surface is provided on one side of the rotating plate, the second curved surface corresponds to the first curved surface, and several rotating plates are fitted together. The cooperation between the first curved surface and the second curved surface can make the rotating plate and the inner wall of the air vent fit tightly.

[0008] Preferably, a sealing gasket is fixed to the inner wall of the second arc surface, and the sealing gasket can ensure the sealing of the connection between the rotating plates, so that the rotating plates can prevent the entry of moisture when they stop working, thereby ensuring the dryness of the internal environment of the waterproof shell body.

[0009] Preferably, a filter is fixed to the inner wall of the air hole, and the filter can prevent corrosive substances from entering the interior of the waterproof shell body along with the air, thereby protecting the internal electronic components and circuits from corrosion and extending the service life of the detection module body.

[0010] Preferably, a sealing ring is fixed to the bottom surface of the protective plate, and the bottom surface of the sealing ring is in contact with the inner bottom surface of the fixing groove. The sealing ring can fit tightly on the contact surface of the inner bottom surface of the fixing groove through its own elastic deformation, thereby preventing moisture from entering the interior of the waterproof shell body, thereby ensuring that in a humid environment and other conditions, the electronic components and circuits inside the detection module body will not be corroded by water.

[0011] Preferably, a threaded groove is provided on the left side of the protective plate, and a positioning hole is provided on the left side of the waterproof shell body, the positioning hole corresponds to the threaded groove, and a fixing bolt is slidably provided on the inner wall of the positioning hole, and the fixing bolt passes through the positioning hole and is threadably connected to the threaded groove. The protective plate can provide additional protection for internal components, and can prevent external foreign matter (such as dust, small particles, etc.) from entering the interior of the waterproof shell body. It can also play the role of electromagnetic shielding to a certain extent, reducing the influence of external electromagnetic interference on the internal detection module body.

[0012] Preferably, support blocks are fixed at the four corners of the bottom surface of the inner wall of the waterproof shell body, and several support blocks are grouped into two. A support column is fixed between two support blocks. The support blocks and the support columns help to fix the internal detection module body and the layout of the circuit. Internal components can be installed on the support blocks or support columns to ensure that the relative positions of the components are stable under various conditions of use, avoiding problems such as loose connections and short circuits between components due to deformation or vibration of the waterproof shell body, thereby ensuring the normal operation of the detection module body.

[0013] Preferably, two accommodating holes are provided on the front and rear sides of the waterproof shell body, and protective strips are provided on the front and rear sides of the waterproof shell body. Two connecting columns are fixed on one side of the protective strip, and the connecting columns are slidably connected to the accommodating holes. A spring is wound around the outer wall of the connecting column, one end of the spring is fixed to the inner wall of the accommodating hole, and the other end of the spring is fixed to the outer wall of the connecting column. The protective strip can prevent the waterproof shell body from direct friction or scratching when the detection module body contacts other objects, prevent the waterproof layer on the surface of the shell from being damaged, extend the service life of the waterproof shell body, and ensure its long-term waterproof performance.

[0014] Preferably, a signal amplifier is fixed on the inner top surface of the waterproof shell body, a connecting hole is opened on the top surface of the waterproof shell body, a signal transmitter is fixed on the inner wall of the connecting hole, and the signal amplifier and the signal transmitter are electrically connected to the PLC controller. The signal amplifier can increase the strength of the signal and make the signal more prominent under the noise background, thereby improving the anti-interference ability of the signal and ensuring that the detection module body outputs accurate and reliable detection results.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The metal plate and metal column can quickly absorb the heat generated by the components and conduct the heat to the outside of the waterproof shell. At the same time, the phase change material filled in the metal shell will undergo a phase change (such as from solid to liquid) when absorbing heat, thereby effectively reducing the temperature of the surrounding environment, playing a role in heat dissipation and temperature control, and ensuring that the detection module body works within an appropriate temperature range. At the same time, when the detection module body is suddenly subjected to a large heat load (such as entering a high temperature environment from a low temperature environment in a short period of time), the metal plate, metal column and phase change material can quickly absorb heat, alleviate the sharp rise in temperature, reduce the impact of thermal shock on internal components, protect components from damage caused by sudden temperature changes, and improve the environmental adaptability of the detection module body;

[0017] Second, the opening and closing of the vents can be controlled by driving the rotating plate with a micro motor. When the temperature inside the waterproof shell is too high, the signal transmitted by the PLC controller can control the air exchange inside and outside the waterproof shell to balance the internal humidity and air pressure, and prevent the waterproof shell from being deformed or the sealing structure from being damaged due to excessive pressure difference. It also helps to control the internal humidity and prevent the components from getting damp. The filter can effectively block dust and impurities, prevent dust and impurities from contaminating the internal components of the waterproof shell and affecting their normal operation, thereby ensuring that the air entering the waterproof shell is clean;

[0018] 3. The protective plate can be fixed by fixing bolts, so that the staff can easily remove the protective plate when they need to maintain, inspect or replace components inside the detection module body. The overall structural strength of the waterproof shell body can be increased by the cooperation of the support blocks and the support columns. When subjected to external pressure (such as water pressure underwater, extrusion during stacking or transportation, etc.), the support blocks at the four corners can withstand greater pressure, and the support columns connect the various support blocks so that the force can be evenly distributed to prevent the waterproof shell body from deformation or rupture, thereby protecting the detection module body inside the waterproof shell body. The cooperation of the protective strip and the spring can play a buffering role. When subjected to external force impact, the protective strip first contacts the collision object, and the spring further absorbs and disperses the impact force, reducing the impact force directly transmitted to the waterproof shell body and internal components, thereby protecting the internal magnetic detection components and circuits from damage, thereby improving the integrity of the waterproof shell body. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A three-dimensional schematic diagram of the invention;

[0020] Figure 2 Schematic diagram of the explosion of the invention;

[0021] Figure 3 for Figure 2 Schematic diagram of explosion at the metal plate and metal shell;

[0022] Figure 4 for Figure 2 Explosion diagram of the middle protection strip and connecting column;

[0023] Figure 5 for Figure 2 Explosion diagram of the middle support block and support column;

[0024] Figure 6 for Figure 2 The enlarged schematic diagram at A in the middle;

[0025] Figure 7 for Figure 2 Enlarged schematic diagram of point B in the middle.

[0026] In the figure: 1. waterproof shell body; 2. fixing hole; 3. detection module body; 4. circuit board; 5. metal plate; 6. metal shell; 7. metal column; 8. through hole; 9. fixing groove; 901. protective plate; 10. mounting hole; 11. fan; 12. air vent; 13. mounting groove; 14. micro motor; 15. rotating plate; 16. first arc surface; 17. second arc surface; 18. sealing gasket; 19. filter screen; 20. sealing ring; 21. threaded groove; 22. positioning hole; 23. fixing bolt; 24. support block; 25. support column; 26. accommodation hole; 27. protective strip; 28. connecting column; 29. ​​spring; 30. signal amplifier; 31. connecting hole; 32. signal transmitter. DETAILED DESCRIPTION

[0027] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0028] like Figure 1-Figure 4 , Figure 6 and Figure 7As shown, a magnetic detection module with a waterproof shell comprises a waterproof shell body 1, the outer wall of the waterproof shell body 1 is coated with a waterproof layer, a fixing hole 2 is provided on the bottom surface of the waterproof shell body 1, a detection module body 3 is fixed on the inner wall of the fixing hole 2, a circuit board 4 is fixed on the inner bottom surface of the waterproof shell body 1, a PLC controller is fixed on the top surface of the circuit board 4, the detection module body 3 and the circuit board 4 are electrically connected to the PLC controller, a metal plate 5 is fixed on the front and rear sides of the circuit board 4, two metal shells 6 are fixed between the two metal plates 5, the interior of the metal shell 6 is filled with a phase change material, a metal column 7 is fixed on the metal shell 6, and through holes 8 are provided on the left and right sides of the waterproof shell body 1, and the metal column 7 extends into the through hole 8, a fixing groove 9 is provided on the top surface of the waterproof shell body 1, and a protective plate 901 is rotatably connected to the inner wall of the fixing groove 9 through a hinge, a mounting hole 10 is provided on the top surface of the protective plate 901, a fan 11 is fixed to the inner wall of the mounting hole 10, and the fan 11 is electrically connected to the PLC controller, air holes 12 are provided on the front and rear sides of the waterproof shell body 1, and a plurality of mounting grooves 13 are provided on the bottom surface of the inner wall of the air hole 12, a micro motor 14 is fixed to the inner wall of the mounting groove 13, a rotating plate 15 is fixed to one end of the output shaft of the micro motor 14, the micro motor 14 and the PLC controller, the metal plate 5, the metal shell 6, and the metal column 7 are all made of copper, and the phase change material can be paraffin.

[0029] During use, the metal plate 5 and the metal column 7 can quickly absorb the heat generated by the components and conduct the heat to the outside of the waterproof shell body 1. At the same time, the phase change material filled in the metal shell 6 will undergo a phase change (such as from solid to liquid) when absorbing heat, thereby effectively reducing the temperature of the surrounding environment, playing a role in heat dissipation and temperature control, and ensuring that the detection module body 3 operates within an appropriate temperature range. At the same time, when the detection module body 3 is suddenly subjected to a large heat load (such as entering a high temperature environment from a low temperature environment in a short period of time), the metal plate 5, the metal column 7 and the phase change material can quickly absorb heat, alleviate the sharp rise in temperature, reduce the impact of thermal shock on internal components, protect the components from damage caused by sudden temperature changes, and improve the environmental adaptability of the detection module body 3.

[0030] The opening and closing of the air vent 12 is controlled by driving the rotating plate 15 to rotate through the micro motor 14. When the temperature inside the waterproof shell body 1 is too high, the air exchange inside and outside the waterproof shell body 1 can be controlled by the signal transmitted by the PLC controller to balance the internal humidity and air pressure, prevent the waterproof shell body 1 from being deformed or the sealing structure from being damaged due to excessive air pressure difference, and also help control the internal humidity to prevent the components from getting damp. At the same time, when ventilation is not required (such as in a humid environment), the rotating plate 15 can close the air vent 12 to prevent moisture, dust, impurities, etc. from entering the interior of the waterproof shell body 1 through the air vent 12. While ensuring the balance of internal air pressure and humidity, the waterproof and protective performance of the waterproof shell body 1 is not affected.

[0031] like Figure 1 , Figure 2 , Figure 6 and Figure 7 As shown, a first curved surface 16 is provided on the right side of the inner wall of the air vent 12, and a second curved surface 17 is provided on one side of the rotating plate 15. The second curved surface 17 corresponds to the first curved surface 16, and several rotating plates 15 are fitted together. A sealing gasket 18 is fixed to the inner wall of the second curved surface 17, and a filter screen 19 is fixed to the inner wall of the air vent 12.

[0032] In use, the first curved surface 16 and the second curved surface 17 cooperate to make the rotating plate 15 fit tightly with the inner wall of the air vent 12. The sealing gasket 18 can ensure the sealing of the connection between the rotating plates 15, so that the rotating plates 15 can prevent the entry of moisture when they stop working, thereby ensuring the dryness of the internal environment of the waterproof shell body 1. The filter 19 can effectively block dust and impurities, prevent dust and impurities from contaminating the internal components of the waterproof shell body 1 and affecting its normal operation, thereby ensuring that the air entering the waterproof shell body 1 is clean. At the same time, the filter 19 can prevent corrosive substances from entering the waterproof shell body 1 with the air, thereby protecting the internal electronic components and circuits from corrosion and extending the service life of the detection module body 3.

[0033] like Figure 1-Figure 3 , Figure 5-Figure 6 As shown, a sealing ring 20 is fixed to the bottom surface of the protective plate 901, and the bottom surface of the sealing ring 20 contacts the inner bottom surface of the fixing groove 9. A threaded groove 21 is opened on the left side of the protective plate 901, and a positioning hole 22 is opened on the left side of the waterproof shell body 1. The positioning hole 22 corresponds to the threaded groove 21, and a fixing bolt 23 is slidably provided on the inner wall of the positioning hole 22. The fixing bolt 23 passes through the positioning hole 22 and is threadedly connected with the threaded groove 21. Support blocks 24 are fixed at the four corners of the bottom surface of the inner wall of the waterproof shell body 1. Several support blocks 24 are grouped in two, and a support column 25 is fixed between the two support blocks 24.

[0034] During use, the sealing ring 20 can be elastically deformed to fit tightly on the contact surface of the bottom surface of the fixing groove 9, thereby preventing moisture from entering the waterproof shell body 1, and ensuring that the electronic components and circuits inside the detection module body 3 will not be corroded by water under conditions such as humid environments. The protective plate 901 can be fixed by fixing bolts 23, so that the staff can easily remove the protective plate 901 when it is necessary to maintain, inspect or replace components inside the detection module body 3. At the same time, the protective plate 901 can provide additional protection for the internal components, prevent foreign matter (such as dust, small particles, etc.) from entering the waterproof shell body 1, and can also play the role of electromagnetic shielding to a certain extent, reducing the impact of external electromagnetic interference on the internal detection module body 3.

[0035] By cooperating with the support blocks 24 and the support columns 25, the overall structural strength of the waterproof shell body 1 can be increased. When subjected to external pressure (such as water pressure underwater, squeezing during stacking or transportation, etc.), the support blocks 24 at the four corners can withstand greater pressure, and the support columns 25 connect the support blocks 24 to evenly distribute the force, thereby preventing the waterproof shell body 1 from deformation or rupture, thereby protecting the detection module body 3 inside the waterproof shell body 1. At the same time, the support blocks 24 and the support columns 25 help to fix the internal detection module body 3 and the layout of the circuit. The internal components can be installed on the support blocks 24 or the support columns 25 to ensure that the relative positions of the components are stable under various conditions of use, and to avoid problems such as loose connections and short circuits between components due to deformation or vibration of the waterproof shell body 1, thereby ensuring the normal operation of the detection module body 3.

[0036] like Figure 1-Figure 4 , Figure 6 and Figure 7 As shown, two receiving holes 26 are provided on the front and rear sides of the waterproof shell body 1, and protective strips 27 are provided on the front and rear sides of the waterproof shell body 1. Two connecting columns 28 are fixed on one side of the protective strip 27. The connecting columns 28 are slidably connected to the receiving holes 26. The outer wall of the connecting column 28 is wound with a spring 29. One end of the spring 29 is fixed to the inner wall of the receiving hole 26, and the other end of the spring 29 is fixed to the outer wall of the connecting column 28. A signal amplifier 30 is fixed on the inner top surface of the waterproof shell body 1, and a connecting hole 31 is provided on the top surface of the waterproof shell body 1. A signal transmitter 32 is fixed on the inner wall of the connecting hole 31. The signal amplifier 30 and the signal transmitter 32 are both electrically connected to the PLC controller.

[0037] In use, the protection strip 27 and the spring 29 can play a buffering role. When impacted by external force, the protection strip 27 first contacts the collision object, and the spring 29 further absorbs and disperses the impact force, reducing the impact force directly transmitted to the waterproof shell body 1 and internal components, thereby protecting the internal magnetic detection components and circuits from damage, thereby improving the integrity of the waterproof shell body 1. At the same time, the protection strip 27 can prevent the waterproof shell body 1 from direct friction or scratching when the detection module body 3 contacts other objects, prevent the waterproof layer on the surface of the shell from being damaged, extend the service life of the waterproof shell body 1, and ensure its long-term waterproof performance. The signal amplifier 30 can enhance the weak magnetic detection signal so that it can still maintain sufficient strength to be accurately received and processed by the subsequent circuit after the attenuation effect related to the waterproof shell body 1. At the same time, the signal amplifier 30 can increase the strength of the signal, making the signal more prominent in the noise background, thereby improving the anti-interference ability of the signal and ensuring that the detection module body 3 outputs accurate and reliable detection results.

[0038] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A magnetic detection module with a waterproof housing, comprising a waterproof housing body (1), characterized in that: The outer wall of the waterproof shell body (1) is coated with a waterproof layer, the bottom surface of the waterproof shell body (1) is provided with a fixing hole (2), the inner wall of the fixing hole (2) is fixed with a detection module body (3), the inner bottom surface of the waterproof shell body (1) is fixed with a circuit board (4), the top surface of the circuit board (4) is fixed with a PLC controller, the detection module body (3) and the circuit board (4) are both electrically connected to the PLC controller, the front and rear sides of the circuit board (4) are both fixed with metal plates (5), two metal shells (6) are fixed between the two metal plates (5), the interior of the metal shell (6) is filled with phase change material, a metal column (7) is fixed on the metal shell (6), the left and right sides of the waterproof shell body (1) are provided with through holes (8), the metal The column (7) extends into the through hole (8); a fixing groove (9) is provided on the top surface of the waterproof shell body (1); the inner wall of the fixing groove (9) is rotatably connected to a protective plate (901) through a hinge; a mounting hole (10) is provided on the top surface of the protective plate (901); a fan (11) is fixed on the inner wall of the mounting hole (10); the fan (11) is electrically connected to a PLC controller; air holes (12) are provided on the front and rear sides of the waterproof shell body (1); a plurality of mounting grooves (13) are provided on the bottom surface of the inner wall of the air hole (12); a micro motor (14) is fixed on the inner wall of the mounting groove (13); a rotating plate (15) is fixed to one end of the output shaft of the micro motor (14); the micro motor (14) is connected to the PLC controller.

2. A magnetic detection module with a waterproof housing according to claim 1, characterized in that: A first curved surface (16) is provided on the right side of the inner wall of the air vent (12), and a second curved surface (17) is provided on one side of the rotating plate (15). The second curved surface (17) corresponds to the first curved surface (16), and a plurality of the rotating plates (15) are fitted together.

3. A magnetic detection module with a waterproof housing according to claim 2, characterized in that: A sealing gasket (18) is fixed to the inner wall of the second curved surface (17).

4. The magnetic detection module with a waterproof housing according to claim 1, characterized in that: A filter screen (19) is fixed on the inner wall of the air vent (12).

5. The magnetic detection module with a waterproof housing according to claim 1, characterized in that: A sealing ring (20) is fixed to the bottom surface of the protective plate (901), and the bottom surface of the sealing ring (20) is in contact with the inner bottom surface of the fixing groove (9).

6. A magnetic detection module with a waterproof housing according to claim 5, characterized in that: A thread groove (21) is provided on the left side of the protective plate (901), and a positioning hole (22) is provided on the left side of the waterproof shell body (1). The positioning hole (22) corresponds to the thread groove (21), and a fixing bolt (23) is slidably provided on the inner wall of the positioning hole (22). The fixing bolt (23) passes through the positioning hole (22) and is threadably connected to the thread groove (21).

7. The magnetic detection module with a waterproof housing according to claim 1, characterized in that: Support blocks (24) are fixed at four corners of the bottom surface of the inner wall of the waterproof shell body (1), two of the support blocks (24) form a group, and a support column (25) is fixed between two of the support blocks (24).

8. The magnetic detection module with a waterproof housing according to claim 7, characterized in that: The front and rear sides of the waterproof shell body (1) are both provided with two receiving holes (26), and the front and rear sides of the waterproof shell body (1) are both provided with protective strips (27). Two connecting columns (28) are fixed on one side of the protective strip (27), and the connecting columns (28) are slidably connected to the receiving holes (26). A spring (29) is wound around the outer wall of the connecting column (28), and one end of the spring (29) is fixed to the inner wall of the receiving hole (26), and the other end of the spring (29) is fixed to the outer wall of the connecting column (28).

9. A magnetic detection module with a waterproof housing according to claim 8, characterized in that: A signal amplifier (30) is fixed on the inner top surface of the waterproof shell body (1); a connection hole (31) is opened on the top surface of the waterproof shell body (1); a signal transmitter (32) is fixed on the inner wall of the connection hole (31); and both the signal amplifier (30) and the signal transmitter (32) are electrically connected to the PLC controller.

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