Tunnel lining vault liquid level void sensing and monitoring device and installation method thereof

By uniformly installing liquid level sensors on the working plate and using the fixing method of magnetic and elastic parts, the complex and error of liquid level sensor installation in tunnel construction is solved, and the installation efficiency and detection accuracy are improved.

CN119197692APending Publication Date: 2024-12-27ZHEJIANG LIANGHE TRAFFIC CONSTRUCT CO LTD
View PDF 0 Cites 0 Cited by

Patent Information

Application Number
CN202411324898.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-09-23
Publication Date
2024-12-27

AI Technical Summary

Technical Problem

The existing liquid level sensors are complex in installation during tunnel construction and are prone to inconsistent, resulting in detection errors and affecting monitoring results.

Method used

A tunnel-lined vault liquid level de-air sensing monitoring device is designed. By uniformly installing the liquid level sensor on the working plate and using a combination of magnetic parts and elastic parts to simplify the installation process and reduce errors.

Benefits of technology

The unified installation of liquid level sensors is realized, the installation efficiency and detection accuracy are improved, errors are reduced, the power connection process is simplified, and the overall installation efficiency is improved.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN119197692A_ABST
    Figure CN119197692A_ABST
Patent Text Reader

Abstract

The invention discloses a tunnel lining vault liquid level void sensing and monitoring device and a mounting method thereof, and relates to the technical field of tunnel engineering monitoring, the tunnel lining vault liquid level void sensing and monitoring device comprises a liquid level sensor and a working plate, the working plate is uniformly provided with a plurality of mounting holes for fixing the liquid level sensor; a fixing hole communicated with the mounting hole is formed in the working plate, a positioning pin sliding in the axial direction of the fixing hole is arranged in the fixing hole, an elastic piece with one end connected with the inner side wall of the fixing hole is arranged in the fixing hole, and the other end of the elastic piece is connected with the positioning pin; a sliding hole communicated with the fixing hole is formed in the working plate, and a shifting rod extending out of the sliding hole is arranged on the positioning pin, so that the liquid level sensors can be rapidly installed, a plurality of liquid level sensors can be installed at the same time, the liquid level sensors do not need to be independently installed, and the working efficiency is improved.
Need to check novelty before this filing date? Find Prior Art

Description

Technical Field

[0001] The present application relates to the technical field of tunnel engineering monitoring, and in particular to a tunnel lining vault liquid level depletion sensing monitoring device and an installation method thereof. Background Art

[0002] In recent years, tunnel construction has developed rapidly, and many problems have emerged in the process of tunnel construction. Among them, tunnel vault debulking is a common and dangerous problem, which will cause insufficient lining strength and safety accidents such as cracking and falling blocks. Therefore, during the secondary lining of the tunnel, monitoring of the lining is particularly important. Currently, liquid level sensors are commonly installed on the trolley formwork to detect the concrete filling height, and usually several liquid level sensors are required for monitoring.

[0003] With respect to the above-mentioned related technologies, the existing liquid level sensors are complicated to install, and detection errors may occur due to inconsistent installation when they are installed independently, thereby affecting the detection results, which needs to be improved. Summary of the invention

[0004] The first purpose of the present application is to provide a tunnel lining vault liquid level depletion sensing monitoring device to improve the problem of complex installation and error of the liquid level sensor.

[0005] The present application provides a tunnel lining vault liquid level degassing sensor monitoring device adopts the following technical solution:

[0006] A tunnel lining vault liquid level degassing sensing monitoring device includes a liquid level sensor, which is characterized by comprising a working plate, on which a plurality of mounting holes for inserting the liquid level sensor are evenly arranged, and also comprising a first fixing part and a second fixing part.

[0007] By adopting the above technical solution, several liquid level sensors are first installed on a working plate at the same time, and then the working plate is placed in the area to be detected. This is simpler and easier than the existing installation method; at the same time, it can also achieve unified installation of the liquid level sensors and reduce detection errors; and a first fixing part and a second fixing part are set to fix the liquid level sensor.

[0008] Preferably, the first fixing portion comprises a placement groove and a magnetic component 1, the placement groove is arranged at the bottom of the mounting hole, and a magnetic component 1 magnetically attracted to the bottom of the liquid level sensor is arranged in the placement groove.

[0009] By adopting the above technical solution, the liquid level sensor installed in the mounting hole is fixed by utilizing the magnetic force of the magnetic component 1, thereby reducing its shaking in the mounting hole.

[0010] Preferably, the second fixing portion includes a fixing hole, a positioning pin installed in the fixing hole, and an elastic member; a fixing hole communicating with the mounting hole is provided inside the working plate; a positioning pin sliding along its axial direction is provided in the fixing hole; an elastic member having one end connected to the inner side wall of the fixing hole is provided in the fixing hole, and the other end of the elastic member is connected to the positioning pin; a sliding hole communicating with the fixing hole is provided on the working plate, and a lever extending out of the sliding hole is provided on the positioning pin.

[0011] By adopting the above technical solution, the elastic force of the elastic member is used to push the positioning pin against the liquid level sensor to further fix the liquid level sensor; at the same time, a lever is provided on the positioning pin, and the positioning pin can be controlled to slide by the lever to leave enough space for the liquid level sensor, and then the lever is released to press against the liquid level sensor; using this method to fix the liquid level sensor is easy to operate and improves installation efficiency.

[0012] Preferably, an anti-slip sleeve is provided at one end of the positioning pin that is in contact with the liquid level sensor.

[0013] By adopting the above technical solution, the anti-slip sleeve is provided to increase the friction between the positioning pin and the liquid level sensor, thereby improving the fixing ability of the positioning pin.

[0014] Preferably, an embedding groove is provided on the end surface of the positioning pin that contacts the anti-slip sleeve, and an embedding protrusion is provided inside the anti-slip sleeve corresponding to the embedding groove, and the embedding protrusion can be inserted into the embedding groove.

[0015] By adopting the above technical solution, an embedding protrusion is arranged in the anti-slip sleeve and inserted into the embedding groove on the positioning pin, so that the anti-slip sleeve is more stably installed on the positioning pin, preventing the anti-slip sleeve from falling off during the installation process.

[0016] Preferably, a fixing groove is provided on the surface of the working plate that is in contact with the trolley template, and a second magnetic member is provided in the fixing groove.

[0017] By adopting the above technical solution, the working plate is fixed to the surface of the trolley template by utilizing the magnetic force of the magnetic part 2 at the bottom of the working plate, so that several liquid level sensors installed on the working plate are fixed simultaneously by fixing the working plate.

[0018] Preferably, a power socket is provided on the side wall of the mounting hole, and a power connector which can be connected to the power socket is provided on the liquid level sensor.

[0019] By adopting the above technical solution, the liquid level sensor can be installed on the working plate and powered at the same time, which simplifies the installation process and improves the installation efficiency.

[0020] Preferably, the powered sockets are commonly connected to a circuit channel leading to the outside of the working panel.

[0021] By adopting the above technical solution, the liquid level sensors installed on the working plate are uniformly connected to one line, and then connected to an external power supply through this line. There is no need to connect the liquid level sensors to the circuit separately, which facilitates the power connection of several liquid level sensors and further improves the installation efficiency.

[0022] The second object of the present application is to provide an installation method for a tunnel lining vault liquid level depletion sensor monitoring device to improve the problem of complex installation and error of the liquid level sensor.

[0023] A method for installing a tunnel lining vault liquid level degassing sensor monitoring device:

[0024] Preferably, S100, connecting the power connector on the liquid level sensor to the power socket on the inner wall of the mounting hole;

[0025] S200, after the power connector and the power socket are connected, the lever is pushed away from the mounting hole to put the liquid level sensor into the mounting hole. At this time, the first fixing part fixes the liquid level sensor, and the magnetic part at the bottom of the mounting hole absorbs the liquid level sensor; then the lever is released, and the second fixing part fixes the liquid level sensor, and the positioning pin presses against the liquid level sensor;

[0026] S300, using the second magnetic member provided on the bottom surface of the working plate, the working plate is adsorbed and fixed to the area to be inspected on the trolley template;

[0027] S400, connect the circuit channel to the power supply to complete the power connection to the liquid level sensor.

[0028] By adopting the above technical solution, several liquid level sensors are installed on a working plate at the same time, and then the working plate is installed in the area to be detected. Compared with the existing structure, the installation process is simpler and faster; at the same time, the liquid level sensors can also be installed uniformly to reduce the detection error caused by inconsistent installation; and the first fixing part and the second fixing part are set to fix the liquid level sensor to increase the stability of the device.

[0029] Preferably, S210, the first fixing portion is composed of a placement groove and a magnetic member 1, the magnetic member 1 is fixed in the placement groove, and when the liquid level sensor is installed, the bottom surface of the liquid level sensor is in contact with the magnetic member 1 and is adsorbed and fixed by the magnetic member 1;

[0030] S220, the second fixing part is composed of a fixing hole, a positioning pin, and an elastic member. A lever is provided on the positioning pin. The lever is pushed in a direction away from the mounting hole, and the lever drives the positioning pin into the fixing hole to leave space for placing the liquid level sensor. Then, the lever is released, and the elastic member provided in the fixing hole will push the positioning pin to slide out of the fixing hole until it contacts the liquid level sensor.

[0031] S221, install an anti-slip sleeve on the end of the positioning pin that fits the liquid level sensor, the end face of the positioning pin is provided with an embedding groove, and the inside of the anti-slip sleeve is provided with an embedding protrusion, the anti-slip sleeve is put on the positioning pin, and the embedding protrusion is inserted into the embedding groove corresponding to the anti-slip sleeve, so that the anti-slip sleeve fits the liquid level sensor.

[0032] By adopting the above technical solution, the first fixing part is used for preliminary fixing, that is, the magnetic force of the magnetic part is used to adsorb the liquid level sensor to reduce its shaking during installation; the second fixing part is used for further fixing, and the positioning pin is pushed against the liquid level sensor by the elastic part to stabilize it, so that the liquid level sensor is more firmly installed and will not fall off easily; at the same time, an anti-slip sleeve is installed on the end of the positioning pin that is in contact with the liquid level sensor, which increases the friction between the positioning pin and the liquid level sensor and further ensures the stability of the second fixing part.

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

[0034] 1. By installing multiple liquid level sensors on the working plate, and then installing the working plate on the trolley template, multiple liquid level sensors can be installed at the same time. Compared with individual installation, the installation efficiency of the liquid level sensors is greatly improved, and unified installation on the working plate is also conducive to avoiding installation errors during separate installation, thereby improving the accuracy of detection;

[0035] 2. A positioning pin is set on the working plate, and the positioning pin is pressed against the liquid level sensor by utilizing the elastic force of the elastic member, thereby fixing the liquid level sensor; and the positioning pin can be moved by using the lever provided on the positioning pin, so the overall installation is convenient and quick, and the liquid level sensor can be effectively fixed while improving the installation efficiency; at the same time, a magnetic member 1 is set at the bottom of the mounting hole, and the magnetic force of the magnetic member 1 is utilized to further fix the liquid level sensor.

[0036] 3. A power socket for the liquid level sensor is provided in the installation hole, which provides convenience for the power connection of the liquid level sensor; at the same time, each power socket is connected to the same circuit, and the power supply is connected through this circuit, which simplifies the installation process and improves the installation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of the overall structure of a tunnel lining vault liquid level degassing sensor monitoring device of the present application.

[0038] Figure 2 yes Figure 1 Enlarged view of part A in .

[0039] Figure 3 yes Figure 2 Enlarged view of part B in .

[0040] Figure 4It is a cross-sectional schematic diagram for showing the internal structure of the mounting hole in the embodiment

[0041] Figure 5 It is a cross-sectional schematic diagram for illustrating the internal structure of the working plate in the embodiment.

[0042] Figure 6 It is a cross-sectional schematic diagram for illustrating the internal structure of the circuit channel in the embodiment.

[0043] In the figure, 1. liquid level sensor; 11. sensor; 11. power connector; 2. working plate; 21. mounting hole; 22. first fixing part; 221. placement slot; 222. magnetic part 1; 23. second fixing part; 231. fixing hole; 2311. sliding hole; 232. positioning pin; 2321. lever; 2322. embedded slot; 233. elastic part; 24. anti-slip sleeve; 241. embedded protrusion; 25. fixing slot; 251. magnetic part 2; 26. power socket; 3. circuit channel. DETAILED DESCRIPTION

[0044] The following is combined with Figure 1 -Attached Figure 6 , further details of this application are given.

[0045] Embodiment 1:

[0046] A tunnel lining vault liquid level degassing sensor monitoring device, referring to Figure 1 , including a liquid level sensor 1 and a working plate 2. The working plate 2 has four mounting holes 21, and the liquid level sensor 1 can be placed in the mounting holes 21; the bottom of the mounting hole 21 is also provided with a placement groove 221 for installing a magnetic part 222, and the liquid level sensor 1 is fixed by the magnetic force of the magnetic part 222. The magnetic part 222 is a magnet, and the placement groove 221 and the magnetic part 222 constitute a first fixing part 22.

[0047] Reference Figure 2 and Figure 3A fixing hole 231 is provided on the inner side wall of the mounting hole 21, and a positioning pin 232 is installed in the fixing hole 231; an elastic member 233 is installed in the fixing hole 231, and the elastic member 233 is a spring, one end of the elastic member 233 is installed on the inner side wall of the fixing hole 231, and the other end is against the positioning pin 232, and the fixing hole 231, the positioning pin 232, and the elastic member 233 constitute the second fixing part 23; the positioning pin 232 uses the elastic force of the elastic member 233 to push the positioning pin 232 against the liquid level sensor 1, so as to fix the liquid level sensor 1; a lever 2321 is provided on the positioning pin 232, and a sliding hole 2321 communicating with the fixing hole 231 is provided on the surface of the working plate 2 311, the lever 2321 extends out of the surface of the working plate 2 through the sliding hole 2311, so that the lever 2321 can be used to control the positioning pin 232 to slide into the fixing hole 231, so as to leave enough installation space when installing the liquid level sensor 1, making the installation more labor-saving and convenient; at the same time, an anti-slip sleeve 24 is sleeved on the end of the positioning pin 232 that is in contact with the liquid level sensor 1, and the material of the anti-slip sleeve 24 is rubber. The anti-slip sleeve 24 is fixed to each other through the embedding protrusion 241 set on the inner wall and the embedding groove 2322 set on the end face of the positioning pin 232. The anti-slip sleeve 24 is used to increase the friction of the positioning pin 232, prevent the liquid level sensor 1 from slipping out, and improve the stability of the installation.

[0048] Reference Figure 2 and Figure 6 A power socket 26 is installed on the inner wall of the mounting hole 21, and the liquid level sensor 1 can be connected to the power supply by connecting it to the power socket 26 through the power connector 12, so that the power supply can be connected while the liquid level sensor 1 is installed, simplifying the installation process; a circuit channel 3 is arranged inside the working plate 2, and the circuit channel 3 connects all the power sockets 26, that is, only one line is needed to energize all the power sockets 24, further facilitating the installation of the liquid level sensor 1 and improving the installation efficiency.

[0049] Reference Figure 5 A fixing groove 25 is provided on the surface where the working plate 2 and the trolley template (not shown in the figure) are in contact. A magnetic part 251 is installed in the fixing groove 25. The magnetic part 251 is a magnet. The magnetic force of the magnetic part 251 is used to fix the working plate 2 on the trolley template. The use of the magnetic part 251 is convenient and quick to fix, meets the fixing requirements, and improves efficiency.

[0050] The implementation principle of the embodiment of the present application is:

[0051] First, connect the liquid level sensor 1 to the circuit of the working plate 2, and connect the power connector 12 of the liquid level sensor 1 to the power socket 26 in the mounting hole 21; then install the liquid level sensor 1 on the working plate 2, and push the lever 2321 in the direction away from the mounting hole 21, and control the positioning pin 232 to slide into the fixing hole 231 through the lever 2321, leaving a placement space for the liquid level sensor 1; at this time, align the bottom surface of the liquid level sensor 1 with the magnetic piece 222 installed in the placement groove 221 at the bottom of the mounting hole 21, and rely on the magnetic The liquid level sensor 1 is initially fixed by the magnetism of the magnetic member 222; then the lever 2321 is loosened, and the elastic member 233 arranged in the fixing hole 231 will push the positioning pin 232 to slide toward the mounting hole 21 until it contacts the liquid level sensor 1, and press the liquid level sensor 1 to further fix the liquid level sensor 1; at the same time, the end of the positioning pin 232 that contacts the liquid level sensor 1 is also covered with an anti-slip sleeve 224, which increases the friction between the positioning pin 221 and the liquid level sensor 1, so that the liquid level sensor 1 will not slip out easily, thereby making the installation more stable.

[0052] After fixing the liquid level sensor 1, the working plate 2 needs to be placed in the area to be detected on the trolley template. The working plate 2 can be fixed on the trolley template by using the magnetic force of the magnetic part 251 installed in the fixing groove 25 at the bottom of the working plate 2, so that the working plate 2 can be quickly installed.

[0053] Since all the power sockets 26 are connected to the circuit channels 3 in the working board 2, only one circuit channel 3 needs to be connected to the power supply to complete the power supply, and there is no need to connect the liquid level sensors 1 to the power supply separately, which greatly improves the installation efficiency.

[0054] Embodiment 2:

[0055] An installation method for a tunnel lining vault liquid level degassing sensor monitoring device:

[0056] S100, connecting the power connector 12 on the liquid level sensor 1 to the power socket 26 on the inner wall of the mounting hole 21;

[0057] S200, after the power connector 12 and the power socket 26 are connected, the lever 2321 is pushed away from the mounting hole 21, and the liquid level sensor 1 is placed in the mounting hole 21. At this time, the first fixing part 22 fixes the liquid level sensor 1, and the magnetic part 222 at the bottom of the mounting hole 21 absorbs the liquid level sensor 1; then the lever 2321 is released, and the second fixing part 23 fixes the liquid level sensor 1, and the positioning pin 232 presses against the liquid level sensor 1;

[0058] S210, the first fixing part 22 is composed of a placement groove 221 and a magnetic member 222, the magnetic member 222 is fixed in the placement groove 221, when the liquid level sensor 1 is installed, the bottom surface of the liquid level sensor 1 is in contact with the magnetic member 222, and is adsorbed and fixed by the magnetic member 222;

[0059] S220, the second fixing portion 23 is composed of a fixing hole 231, a positioning pin 232, and an elastic member 233. The positioning pin 232 is provided with a lever 2321. The lever 2321 is pushed in a direction away from the mounting hole 21. The lever 2321 drives the positioning pin 232 into the fixing hole 231 to leave space for placing the liquid level sensor 1. Then, the lever 2321 is released. The elastic member 233 provided in the fixing hole 231 will push the positioning pin 232 to slide out of the fixing hole 231 until it contacts the liquid level sensor 1.

[0060] S221, install the anti-slip sleeve 24 on the end where the positioning pin 232 fits with the liquid level sensor 1, the end face of the positioning pin 232 is provided with an embedding groove 2322, and the inside of the anti-slip sleeve 24 is provided with an embedding protrusion 241, put the anti-slip sleeve 24 on the positioning pin 232, and insert the embedding protrusion 241 into the corresponding embedding groove 2322, so that the anti-slip sleeve 24 fits with the liquid level sensor 1.

[0061] S300, using the magnetic member 251 provided on the bottom surface of the working plate 2, the working plate 2 is adsorbed and fixed to the area to be inspected on the trolley template;

[0062] S400 , connecting the circuit channel 3 to the power supply to complete the power connection to the liquid level sensor 1 .

[0063] The implementation principle of the embodiment of the present application is:

[0064] By using this tunnel lining vault liquid level degassing sensor monitoring device and installation method, that is, using the working plate 2 to simultaneously install multiple liquid level sensors 1, the liquid level sensors 1 can be quickly installed, thereby improving the efficiency of engineering construction; and the unified installation of the liquid level sensors 1 avoids the errors that may occur when they are installed separately, thereby improving the detection accuracy.

[0065] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A tunnel lining vault liquid level depletion sensing monitoring device, comprising a liquid level sensor (1), characterized in that: It comprises a working plate (2), on which a plurality of mounting holes (21) for inserting a liquid level sensor (1) are evenly arranged, and further comprises a first fixing portion (22) and a second fixing portion (23).

2. A tunnel lining vault liquid level degassing sensing monitoring device according to claim 1, characterized in that: The first fixing portion (22) comprises a placement groove (221) and a magnetic piece (222); the placement groove is arranged at the bottom of the mounting hole; and a magnetic piece (222) is arranged in the placement groove (221) and is magnetically attracted to the bottom of the liquid level sensor.

3. The tunnel lining vault liquid level degassing sensing monitoring device according to claim 1 is characterized by: The second fixing portion (23) comprises a fixing hole (231), a positioning pin (232) installed in the fixing hole, and an elastic member (233); a fixing hole (231) communicating with the mounting hole (21) is arranged inside the working plate (2); a positioning pin (232) sliding along the axial direction thereof is arranged inside the fixing hole (231); an elastic member (233) having one end connected to the inner side wall of the fixing hole (231) is arranged inside the fixing hole (231); the other end of the elastic member (233) is connected to the positioning pin (232); a sliding hole (2311) communicating with the fixing hole (231) is arranged on the working plate (2); and a shifting rod (2321) extending out of the sliding hole (2311) is arranged on the positioning pin (232).

4. The tunnel lining vault liquid level degassing sensing monitoring device according to claim 3 is characterized by: An anti-slip sleeve (24) is provided at one end of the positioning pin (232) that is in contact with the liquid level sensor (1).

5. The tunnel lining vault liquid level degassing sensing monitoring device according to claim 3 is characterized by: The end surface of the positioning pin (232) in contact with the anti-slip sleeve (24) is provided with an embedding groove (2322), and the interior of the anti-slip sleeve (24) is provided with an embedding protrusion (241) corresponding to the embedding groove (2322), and the embedding protrusion (241) can be inserted into the embedding groove (2322).

6. The tunnel lining vault liquid level degassing sensing monitoring device according to claim 1, characterized in that: A fixing groove (25) is provided on the surface of the working plate (2) that is in contact with the trolley template, and a second magnetic member (251) is provided in the fixing groove (25).

7. The tunnel lining vault liquid level depletion sensor monitoring device according to claim 1 is characterized by: The liquid level sensor (1) comprises a sensor (11) and an electrical connector (12) for connecting the sensor (11) to electricity. The side wall of the mounting hole (21) is provided with an electrical socket (26) for connecting the electrical connector (12) to electricity.

8. The tunnel lining vault liquid level degassing sensing monitoring device according to claim 7, characterized in that: The power sockets (26) are commonly connected to a circuit channel (3) leading to the outside of the working board (2).

9. A method for installing a tunnel lining vault liquid level degassing sensor monitoring device, characterized in that: S100, connecting the power connector (12) on the liquid level sensor (1) to the power socket (26) on the inner wall of the mounting hole (21); S200, after the power connector (12) and the power socket (26) are connected, the lever (2321) is moved in a direction away from the mounting hole (21), and the liquid level sensor (1) is placed in the mounting hole (21). At this time, the first fixing part (22) is used to fix the liquid level sensor (1), and the magnetic part (222) at the bottom of the mounting hole (21) adsorbs the liquid level sensor (1); then, the lever (2321) is released, and the second fixing part (23) is used to fix the liquid level sensor (1), and the positioning pin (232) is pressed against the liquid level sensor (1); S300, using the second magnetic member (251) provided on the bottom surface of the working plate (2), the working plate (2) is adsorbed and fixed to the area to be inspected on the trolley template; S400, connecting the circuit channel (3) to the power supply to complete the power connection of the liquid level sensor (1).

10. The tunnel lining vault liquid level depletion sensing monitoring device according to claim 9, characterized in that: S210, the first fixing part (22) is composed of a placement groove (221) and a magnetic part 1 (222), the magnetic part 1 (222) is fixed in the placement groove (221), and when the liquid level sensor (1) is installed, the bottom surface of the liquid level sensor (1) is in contact with the magnetic part 1 (222) and is adsorbed and fixed by the magnetic part 1 (222); S220, the second fixing portion (23) is composed of a fixing hole (231), a positioning pin (232), and an elastic member (233), and a lever (2321) is provided on the positioning pin (232). The lever (2321) is pushed in a direction away from the mounting hole (21), and the lever (2321) drives the positioning pin (232) to enter the fixing hole (231), leaving space for placing the liquid level sensor (1). Then, the lever (2321) is released, and the elastic member (233) provided in the fixing hole (231) will push the positioning pin (232) to slide out of the fixing hole (231) until it contacts the liquid level sensor (1); S221, install the anti-slip sleeve (24) on the end of the positioning pin (232) that is in contact with the liquid level sensor (1), the end surface of the positioning pin (232) is provided with an embedding groove (2322), and the interior of the anti-slip sleeve (24) is provided with an embedding protrusion (241), the anti-slip sleeve (24) is put on the positioning pin (232), and the embedding protrusion (241) is inserted into the corresponding embedding groove (2322), so that the anti-slip sleeve (24) and the liquid level sensor (1) are in contact.