Liquid level meter non-contact precision measuring device and measuring method

Abstract

The invention relates to the technical field of liquid level measurement, and discloses a liquid level meter non-contact precision measurement device, which comprises a mounting shell and a liquid level meter arranged on the mounting shell, and further comprises a positioning plate arranged opposite to the detection end of the liquid level meter and floating on the liquid level, and a liquid level meter arranged on the positioning plate, the display panel is fixedly arranged on the mounting shell, and numerical scales are arranged on the surface of the display panel in the vertical direction; the indicator board is arranged on the mounting shell in a sliding manner and is provided with an indicator mark pointing to the display board; and the linkage mechanism is connected with the positioning plate. According to the liquid level meter non-contact type precision measuring device and the measuring method, the display panel corresponding to the liquid level meter blind area range is preset, when the liquid level rises to the blind area, the positioning plate can drive the indicating plate to move through the linkage mechanism, and the liquid level is accurately measured. Therefore, according to the liquid level of the liquid level in the blind area, the indicating mark on the indicating board points to the corresponding numerical scale on the display board to represent current liquid level data, and it is guaranteed that the liquid level data can be accurately obtained after the liquid level reaches the full scale of the liquid level meter.

Description

Technical Field

[0001] The invention relates to the technical field of liquid level measurement, and in particular to a non-contact precision measuring device and a measuring method for a liquid level meter. Background Art

[0002] A non-contact level meter is an instrument that can measure the height (liquid level) of a liquid medium in a container. The specific measurement process is: by calculating the time between the transmitted signal and the received signal, the distance between the sensor and the object being measured is calculated. Since the propagation speed in the air is constant, the distance between the level sensor and the bottom of the container is constant, and the liquid level of the object being measured can be known. Among them, the representative products of non-contact level meters are ultrasonic level meters;

[0003] The existing ultrasonic level meter is based on a certain distance between the ultrasonic probe and the liquid surface. The probe can transmit and receive signals to obtain the liquid level value of the object being measured. However, due to the structural limitations of the ultrasonic level meter, the ultrasonic level meter transducer has a small area between its transmitting and receiving ultrasonic pulses that cannot be identified as a blind area. In this area, the ultrasonic level meter cannot measure the accurate liquid level value;

[0004] Ultrasonic level meters are widely used in closed water storage structures such as tanks and pools. However, closed water storage structures often overflow, which leads to a problem: due to the measurement blind spot of the ultrasonic level meter, measurement distortion will occur after the liquid level reaches the full scale, and the situation inside the closed water storage structure cannot be seen intuitively, nor can the specific liquid level situation be known.

[0005] Therefore, a non-contact precision measuring device and a measuring method of a liquid level meter are proposed to solve the above problems. Summary of the invention

[0006] 1. Technical issues to be solved

[0007] In view of the shortcomings of the prior art, the present invention provides a non-contact precision measuring device and method for a liquid level meter, which has the advantages of being able to accurately obtain liquid level data even when the liquid level is in a blind spot, and solves the problem of flooding and overflowing in closed water storage structures. Due to the measurement blind spot of the ultrasonic liquid level meter, the liquid level data cannot be accurately measured after the liquid level reaches the full scale.

[0008] (II) Technical solution

[0009] The technical solution of the present invention to solve the above technical problems is as follows: A non-contact precision measuring device of a liquid level meter comprises a mounting housing and a liquid level meter mounted on the mounting housing, and further comprises:

[0010] A positioning plate is arranged opposite to the detection end of the liquid level meter and floats on the liquid surface;

[0011] A display panel is fixed on the mounting housing and has a numerical scale vertically arranged on its surface;

[0012] An indicator plate is slidably mounted on the mounting housing and is provided with an indicator mark pointing to the display plate;

[0013] A linkage mechanism connected to the positioning plate;

[0014] Wherein, as the positioning plate floats within the blind area of ​​the detection end of the liquid level meter, the linkage mechanism drives the indicator plate to move vertically outside the display plate.

[0015] The beneficial effect of the present invention is that by presetting a display board corresponding to the blind area range of the liquid level gauge, when the liquid level rises to the blind area, the positioning plate can drive the indicator board to move through the linkage mechanism, so that according to the liquid level in the blind area, the indicator mark on the indicator board points to the corresponding numerical scale on the display board to represent the current liquid level data, thereby ensuring that the liquid level data can be accurately obtained even after the liquid level reaches the full range of the liquid level gauge.

[0016] Based on the above technical solution, the present invention can also be improved as follows.

[0017] Furthermore, it also includes a conduit, which is arranged on the installation shell and is located outside the positioning plate and the detection end of the liquid level meter.

[0018] Furthermore, the linkage mechanism includes a rope storage shell arranged on the positioning plate, a pulley is provided on the inner side of the lower end of the conduit, a winding wheel is provided on the mounting shell, a pull rope is wound on the inner side of the rope storage shell, the other end of the pull rope passes through the pulley, the mounting shell and the winding wheel in sequence and is connected to the indicator plate, and the lower end of the indicator plate is provided with an adsorption component that is magnetically attracted to the mounting shell.

[0019] Furthermore, the mounting shell includes a mounting plate fixedly connected thereto and a accommodating shell with a hollow interior, a shell cover is inserted into the accommodating shell, and an opening adapted to the detection end of the liquid level meter is provided on one side where the mounting plate and the accommodating shell are connected.

[0020] Furthermore, a threaded rod is vertically rotatable inside the containment shell, the outer side of the threaded rod is threadedly connected to a supporting plate slidably connected to the inner wall of the containment shell, a motor is provided on the top of the containment shell, the output end of the motor is connected to the threaded rod, the liquid level meter shell is mounted on the supporting plate, and the bottom end of the shell cover is provided with a containing groove adapted to the motor.

[0021] Furthermore, a protection triggering area is provided on the display panel, a first triggering member is provided on the indicator panel, the protection triggering area is electrically connected to the controller, and an output end of the controller is electrically connected to the motor.

[0022] Furthermore, a blind spot trigger area, a blind spot depth area and a submerged area are vertically arranged in sequence on the display panel, the blind spot trigger area, the blind spot depth area and the submerged area are electrically connected to indicator lights, the submerged area is electrically connected to a buzzer, and a second trigger component is provided on the indicator panel.

[0023] Furthermore, it also includes a container and a top cover for carrying the solution, the positioning plate is arranged in the container and floats on the liquid surface, the mounting shell is installed on the top cover, and the detection end of the liquid level meter passes through the top cover.

[0024] A non-contact precision measurement method for a liquid level meter comprises the following steps:

[0025] S1, the positioning plate floats on the liquid surface in the container, and moves up and down in the conduit with the liquid surface, and then the detection end of the liquid level meter transmits to the surface of the positioning plate and is received by the same detection end after reflection. The distance from the liquid surface to the liquid level meter is the liquid level in the container;

[0026] S2. Move the liquid surface of the container to the detection blind area of ​​the liquid level gauge. The pull rope between the positioning plate and the indicator plate is straightened and moves up with the liquid surface. The positioning plate pulls the pull rope to drive the indicator plate to move up, so that the adsorption member is no longer magnetically attracted to the mounting shell. The second trigger member on the indicator plate contacts the blind area triggering area, thereby triggering the indicator light to turn green, and the indicator mark on the indicator plate points to the numerical scale on the display board. The indicated numerical scale is the liquid level in the container.

[0027] S3. As the liquid level continues to move up, the second trigger member on the indicator plate contacts the blind zone depth area, thereby triggering the indicator light to light up yellow. As the liquid level moves up, the second trigger member on the indicator plate contacts the submerged area, then the trigger indicator light turns red, the buzzer turns on, and the first trigger member contacts the protection trigger area. The controller controls the motor to start, driving the threaded rod to rotate, and the linkage bearing plate drives the liquid level gauge to move up into the accommodating shell. As the liquid level moves up again, the positioning plate will block the opening of the top cover that accommodates the detection end of the liquid level gauge. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A three-dimensional structural diagram of the installation housing and the conduit of the present invention;

[0029] Figure 2 It is a front view cross-sectional structural diagram of the present invention;

[0030] Figure 3 This is a front view of the structure of the installation housing and the conduit of the present invention;

[0031] Figure 4 This is an enlarged view of point A of the present invention;

[0032] Figure 5 This is an enlarged view of point B of the present invention;

[0033] Figure 6 This is an enlarged view of location C of the present invention;

[0034] Figure 7 It is an enlarged view of D of the present invention;

[0035] Figure 8 This is a control schematic diagram of the present invention.

[0036] In the figure: 1. mounting shell; 11. mounting plate; 12. containing shell; 13. shell cover; 2. liquid level gauge; 3. positioning plate; 4. display board; 5. numerical scale; 6. indication board; 7. indication mark; 8. linkage mechanism; 81. rope storage shell; 82. pulley; 83. winding wheel; 84. pull rope; 85. adsorption member; 10. conduit; 14. threaded rod; 15. bearing plate; 16. motor; 17. protection triggering area; 18. first triggering member; 19. controller; 20. blind triggering area; 21. blind depth area; 22. submerged area; 23. indicator light; 24. second triggering member; 25. container; 26. top cover; 27. buzzer. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] In the embodiment, Figure 1 , Figure 2 , Figure 3 and Figure 6 A non-contact precision measuring device for a liquid level meter is provided, comprising a mounting housing 1 and a liquid level meter 2 mounted on the mounting housing 1, and further comprising:

[0039] The positioning plate 3 is arranged opposite to the detection end of the liquid level meter 2 and floats on the liquid surface;

[0040] A display panel 4 is fixed on the mounting housing 1 and has a numerical scale 5 vertically arranged on its surface;

[0041] An indicator plate 6 is slidably mounted on the mounting housing 1 and is provided with an indicator mark 7 pointing to the display plate 4;

[0042] The linkage mechanism 8 is connected to the positioning plate 3;

[0043] Among them, as the positioning plate 3 floats within the blind area of ​​the detection end of the liquid level meter 2, the linkage mechanism 8 drives the indicator plate 6 to move vertically outside the display plate 4;

[0044] A camera may also be provided on the mounting housing 1 (this embodiment is not shown in the drawings). Specifically, the camera is used to obtain image data of the numerical scale 5 on the display board 4 pointed by the indicator mark 7, and then transmit it to the terminal device for viewing by the staff, so as to realize remote online viewing;

[0045] It also includes a container 25 and a top cover 26 for carrying the solution, the positioning plate 3 is arranged in the container 25 and floats on the liquid surface, the mounting shell 1 is installed on the top cover 26, and the detection end of the liquid level meter 2 passes through the top cover 26;

[0046] Furthermore, it also includes a conduit 10, which is arranged on the mounting housing 1, and the conduit 10 is located outside the positioning plate 3 and the detection end of the liquid level meter 2;

[0047] Among them, the distance between the edge of the positioning plate 3 and the inner wall of the conduit 10 ranges from 3mm to 6mm. This distance allows the positioning plate 3 to move freely up and down in the conduit 10 and can maintain the stability of the liquid level to the maximum extent; and the positioning plate 3 shown always floats on the liquid surface. When the liquid level fluctuates, the positioning plate 3 will only move vertically up and down due to the limitation of the conduit 10, so that the upper surface of the positioning plate 3 is always parallel to the surface of the transmitting and receiving ends of the liquid level meter 2, so that the ultrasonic wave is reflected at an angle of 90 degrees to the reflecting surface, avoiding the reflected signal from failing to return along the original path.

[0048] Further, the linkage mechanism 8 includes a rope storage shell 81 provided on the positioning plate 3, and the number of the rope storage shells 81 is at least an even number of two. The following structure is similarly arranged according to the number of rope storage shells 81. A pulley 82 is provided on the inner side of the lower end of the guide tube 10, and a winding wheel 83 is provided on the mounting housing 1. A pull rope 84 is wound on the inner side of the rope storage shell 81. The other end of the pull rope 84 passes through the pulley 82, the mounting housing 1 and the winding wheel 83 in sequence and is connected to the indicator plate 6. Among them, if the pull rope 84 passes through the positioning plate 3 and the mounting housing 1, it passes through the position provided at There is a sealing treatment to prevent liquid from overflowing, or a pull rope 84 is arranged along the edge of the positioning plate 3, and the lower end of the indicator plate 6 is provided with an adsorption member 85 that is magnetically attracted to the mounting shell 1, and a part of the pull rope 84 is wound in the rope storage shell 81. When the positioning plate 3 does not move to the blind zone liquid level with the liquid surface, the pull rope 84 is in a relaxed state. When the liquid surface moves to the blind zone liquid level, the pull rope 84 is in a straight state, thereby starting to pull the indicator plate 6, and the adsorption member 85 at the lower end of the indicator plate 6 is separated from the magnetic state of the mounting shell 1 and starts to move upward;

[0049] Among them, by arranging the rope storage shell 81 part on the positioning plate 3, when the liquid level fluctuates, a plurality of rope storage shells 81 evenly arranged on the upper end of the positioning plate 3 can be provided to ensure that the positioning plate 3 always remains stable on the liquid surface during the measurement process, reduce jitter, and avoid errors in the ultrasonic liquid level measurement results;

[0050] Specifically, in addition to the above-mentioned method of pulling the indicator plate 6 by the pull rope 84, it can also be: a long rod is provided on the positioning plate 3, and a through hole corresponding to the long rod is opened on the mounting shell 1 (this embodiment is not shown in the drawings). When the liquid level rises to the blind spot, the long rod presses against the indicator plate 6 through the through hole, thereby driving the indicator plate 6 to move vertically, which can also achieve the effect of driving the indicator plate 6 to move;

[0051] The display panel 4 is provided with a blind zone triggering area 20, a blind zone depth area 21 and a submerged area 22 in sequence along the vertical direction. The blind zone triggering area 20, the blind zone depth area 21 and the submerged area 22 are electrically connected with an indicator light 23, and the submerged area 22 is electrically connected with a buzzer 27. A second triggering member 24 is provided on the indicator panel 6.

[0052] Through the above design, when the indicator plate 6 moves to the corresponding area, a corresponding warning effect can be generated, so that the staff can know the current liquid level and the specific situation of the liquid level meter 2, so as to facilitate corresponding operations.

[0053] Among them, although the above structural design can solve the problem that the liquid level data cannot be accurately obtained after the liquid level reaches the full scale of the liquid level meter 2, since the situation inside the closed water storage structure cannot be seen intuitively, the specific liquid level situation cannot be known. If the liquid level in the water storage structure is too high, the measuring part of the ultrasonic liquid level meter or even the entire liquid level meter will be submerged, which will directly cause the ultrasonic liquid level meter to be unable to accurately measure the liquid level or even damage the ultrasonic liquid level meter.

[0054] Therefore, in response to the above-mentioned further problems, further improvements are now made as follows:

[0055] like Figure 1 , Figure 2 , Figure 4 , Figure 5 , Figure 7 and Figure 8 As shown, the mounting shell 1 includes a mounting plate 11 fixedly connected thereto and a accommodating shell 12 with a hollow interior, a shell cover 13 being inserted into the accommodating shell 12, and an opening adapted to the detection end of the liquid level meter 2 is provided on one side where the mounting plate 11 and the accommodating shell 12 are connected.

[0056] A threaded rod 14 is vertically rotatably provided inside the accommodating shell 12, and the outer side of the threaded rod 14 is threadedly connected to a supporting plate 15 which is slidably connected to the inner wall of the accommodating shell 12. A motor 16 is provided on the top of the accommodating shell 12, and the output end of the motor 16 is connected to the threaded rod 14. The shell of the liquid level meter 2 is mounted on the supporting plate 15, and the bottom end of the shell cover 13 is provided with a accommodating groove adapted to the motor 16.

[0057] A protection triggering area 17 is provided on the display panel 4 , a first triggering member 18 is provided on the indicator panel 6 , the protection triggering area 17 is electrically connected to a controller 19 , and an output end of the controller 19 is electrically connected to the motor 16 .

[0058] The display panel 4 is vertically provided with a blind area triggering area 20, a blind area depth area 21 and a submerged area 22 in sequence, the blind area triggering area 20, the blind area depth area 21 and the submerged area 22 are electrically connected with an indicator light 23, the submerged area 22 is electrically connected with a buzzer 27, a second triggering member 24 is provided on the indicator panel 6, the controller 19 is electrically connected with the indicator light 23 and the buzzer 27, and the triggering of the first triggering member 18 and the second triggering member 24 is an existing conventional technology, so no further description is made;

[0059] Specifically, the protection trigger area 17 and the flooding area 22 are arranged opposite to each other on both sides of the display board 4. When the indicator board 6 drives the first trigger member 18 and the second trigger member 24 to move up to the protection trigger area 17 and the flooding area 22, the controller 19 receives the signal and controls the transmission of the motor 16, thereby driving the liquid level meter 2 to move up away from the current liquid level, protecting the liquid level meter 2 from being submerged by the liquid surface, and triggering the indicator light 23 and the buzzer 27 to serve as a warning. When the liquid level continues to rise, the positioning plate 3 will block the top cover 26 and the opening part of the mounting shell 1, and also prevent the rising liquid level from entering the mounting shell 1 and submerging the liquid level meter 2. The above structural design has a good protective effect on the liquid level meter 2.

[0060] A non-contact precision measurement method for a liquid level meter comprises the following steps:

[0061] S1, the positioning plate 3 floats on the liquid surface in the container 25, and is in the conduit 10 and moves up and down with the liquid surface, and then the detection end of the liquid level meter 2 transmits to the surface of the positioning plate 3 and is received by the same detection end after reflection, and the distance from the liquid surface to the liquid level meter 2 is obtained, that is, the liquid level in the container 25;

[0062] S2, the liquid level of the container 25 moves to the detection blind area of ​​the liquid level gauge 2, the pull rope 84 between the positioning plate 3 and the indicating plate 6 is straightened and moves up with the liquid level, the positioning plate 3 pulls the pull rope 84 to drive the indicating plate 6 to move up, so that the adsorption member 85 is no longer magnetically attracted to the mounting housing 1, and the second triggering member 24 on the indicating plate 6 contacts the blind area triggering area 20, thereby triggering the indicator light 23 to light up green, and the indicating mark 7 on the indicating plate 6 points to the numerical scale 5 on the display board 4, and the indicated numerical scale 5 is the liquid level in the container 25;

[0063] S3. As the liquid level continues to move up, the second trigger member 24 on the indicator plate 6 contacts the blind depth area 21, thereby triggering the indicator light 23 to light up yellow. As the liquid level moves up, the second trigger member 24 on the indicator plate 6 contacts the submerged area 22, then the trigger indicator light 23 lights up red, the buzzer 27 turns on, and the first trigger member 18 contacts the protective trigger area 17. The controller 19 controls the motor 16 to start, driving the threaded rod 14 to rotate, and the linkage bearing plate 15 drives the liquid level meter 2 to move up into the accommodating shell 12. As the liquid level moves up again, the positioning plate 3 will block the opening of the top cover 26 that accommodates the detection end of the liquid level meter 2.

[0064] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0065] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A non-contact precision measuring device for a liquid level gauge, comprising a mounting housing (1) and a liquid level gauge (2) mounted on the mounting housing (1), It is characterized in that Also includes: A positioning plate (3) is arranged opposite to the detection end of the liquid level meter (2) and floats on the liquid surface; A display panel (4) is fixedly mounted on the mounting housing (1) and has a numerical scale (5) vertically disposed on its surface; An indicator plate (6) is slidably mounted on the mounting housing (1) and is provided with an indicator mark (7) pointing to the display plate (4); A linkage mechanism (8) connected to the positioning plate (3); Wherein, as the positioning plate (3) floats within the blind area of ​​the detection end of the liquid level meter (2), the linkage mechanism (8) drives the indicating plate (6) to move vertically outside the display plate (4).

2. A non-contact precision measuring device for a liquid level gauge according to claim 1, Features: It also comprises a conduit (10), wherein the conduit (10) is arranged on the mounting shell (1), and the conduit (10) is located outside the positioning plate (3) and the detection end of the liquid level meter (2).

3. A non-contact precision measuring device for a liquid level gauge according to claim 2, Features: The linkage mechanism (8) comprises a rope storage shell (81) arranged on the positioning plate (3), a pulley (82) is arranged on the inner side of the lower end of the guide tube (10), a winding wheel (83) is arranged on the mounting shell (1), a pull rope (84) is wound on the inner side of the rope storage shell (81), the other end of the pull rope (84) passes through the pulley (82), the mounting shell (1) and the winding wheel (83) in sequence and is connected to the indicator plate (6), and the lower end of the indicator plate (6) is provided with an adsorption member (85) magnetically attracted to the mounting shell (1).

4. A non-contact precision measuring device for a liquid level gauge according to claim 1, Features: The mounting shell (1) comprises a mounting plate (11) fixedly connected to each other and a accommodating shell (12) with a hollow interior, a shell cover (13) being inserted into the accommodating shell (12), and an opening adapted to match the detection end of the liquid level meter (2) being provided on one side where the mounting plate (11) and the accommodating shell (12) are connected.

5. A non-contact precision measuring device for a liquid level gauge according to claim 4, Features: A threaded rod (14) is vertically rotatably provided inside the accommodating shell (12); the outer side of the threaded rod (14) is threadedly connected to a bearing plate (15) slidably connected to the inner wall of the accommodating shell (12); a motor (16) is provided at the top of the accommodating shell (12); the output end of the motor (16) is connected to the threaded rod (14); the shell of the liquid level meter (2) is mounted on the bearing plate (15); and a accommodating groove adapted to the motor (16) is provided at the bottom end of the shell cover (13).

6. A non-contact precision measuring device for a liquid level gauge according to claim 5, Features: The display panel (4) is provided with a protection trigger area (17), the indicator panel (6) is provided with a first trigger member (18), the protection trigger area (17) is electrically connected to a controller (19), and the output end of the controller (19) is electrically connected to the motor (16).

7. A non-contact precision measuring device for a liquid level gauge according to any one of claims 1 to 6, Features: The display panel (4) is provided with a blind area triggering area (20), a blind area depth area (21) and a submerged area (22) in sequence along the vertical direction; the blind area triggering area (20), the blind area depth area (21) and the submerged area (22) are electrically connected to an indicator light (23); the submerged area (22) is electrically connected to a buzzer (27); and the indicator panel (6) is provided with a second triggering member (24).

8. A non-contact precision measuring device for a liquid level gauge according to claim 7, Features: It also includes a container (25) and a top cover (26) for carrying the solution. The positioning plate (3) is arranged in the container (25) and floats on the liquid surface. The mounting shell (1) is installed on the top cover (26). The detection end of the liquid level meter (2) passes through the top cover (26).

9. A non-contact precision measurement method for a liquid level meter. Features: The steps include: S1, the positioning plate (3) floats on the liquid surface in the container (25), and is in the conduit (10) and moves up and down with the liquid surface, and then the detection end of the liquid level meter (2) transmits to the surface of the positioning plate (3) and is received by the same detection end after reflection, and the distance from the liquid surface to the liquid level meter (2) is obtained, that is, the liquid level in the container (25); S2, the liquid level of the container (25) moves to the detection blind area of ​​the liquid level meter (2), the pull rope (84) between the positioning plate (3) and the indicating plate (6) is stretched straight, and then moves up with the liquid level, the positioning plate (3) pulls the pull rope (84) to drive the indicating plate (6) to move up, so that the adsorption member (85) is no longer magnetically attracted to the mounting shell (1), the second trigger member (24) on the indicating plate (6) contacts the blind area triggering area (20), thereby triggering the indicator light (23) to light up green, and the indicating mark (7) on the indicating plate (6) points to the numerical scale (5) on the display panel (4), and the indicated numerical scale (5) is the liquid level in the container (25); S3, as the liquid level continues to move upward, the second trigger member (24) on the indicator plate (6) contacts the blind depth area (21), thereby triggering the indicator light (23) to light up in yellow, and as the liquid level moves upward, the second trigger member (24) on the indicator plate (6) contacts the flooding area (22), thereby triggering the indicator light (23) to light up in red, the buzzer (27) turns on, and the first trigger member (18) contacts the protection trigger area (17), and the controller (19) controls the motor (16) to start, driving the threaded rod (14) to rotate, and the linkage bearing plate (15) drives the liquid level meter (2) to move upward into the accommodating shell (12), and as the liquid level moves upward again, the positioning plate (3) will block the opening of the top cover (26) that accommodates the detection end of the liquid level meter (2).

Images