Field water depth measuring device and application method thereof

Abstract

The present invention provides a field water depth measurement device and its application method, the device comprising a measuring tube, a mud cleaning reference component, a float, and a liquid level monitoring sensor component; multiple rows of water inlet holes are provided on the measuring tube; a partition plate is provided inside the measuring tube, the partition plate being placed between the multiple rows of water inlet holes; the float is connected to the liquid level monitoring sensor component and both are arranged above the partition plate; the mud cleaning reference component comprises a reference plate, a guide screw, a mud cleaning scraper, and a tension adjustment unit; the reference plate is slidably sleeved on the outside of the measuring tube; guide screws are provided on both sides of the reference plate; guide grooves are provided on both sides of the measuring tube corresponding to the guide screws; the mud cleaning scraper is provided inside the measuring tube and located below the partition plate, with its two ends passing through the guide grooves and fixedly connected to the guide screw; and a tension adjustment unit is provided at the connection between the guide screw and the reference plate. The application method comprises well drilling and installation, setting the reference zero position, field water depth measurement, and cleaning and maintenance. The present invention is low in cost, simple to operate, and has high measurement accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of water level monitoring, and in particular to field water depth measuring equipment and an application method thereof. Background Art

[0002] Measuring net water use in rice or aquatic crops is fundamental to agricultural water statistics, agricultural water efficiency calculations, and the formulation of crop water quotas. Net water use in paddy fields primarily involves observing the water layer before and after irrigation.

[0003] Currently, there are few dedicated devices for observing water depths in paddy fields. Due to the large number of fields requiring observation, most paddy field water depth observations are performed using a set square or tape measure to save costs and facilitate operation. This method is relatively crude and subject to significant errors from manual operation and reading.

[0004] In addition, the industry often uses automated water level monitoring equipment to monitor the water depth of a small number of fields or experimental plots. Commonly used automated water level monitoring equipment includes electronic water gauges, float water level gauges, ultrasonic water level gauges, pressure water level gauges, tracking water level gauges, and laser water level gauges. However, these automated field water level monitoring devices are expensive and require skilled personnel to operate and maintain, making them difficult to implement on a large scale.

[0005] Therefore, the invention of a field water depth measuring device that is easy to carry, simple to operate, accurate in readings, low in cost, and convenient for large-scale promotion and use is of great significance for water resources management, irrigation area construction and management, and other work in the water conservancy industry such as agricultural water use statistics. Summary of the Invention

[0006] The present invention aims to provide a field water depth measurement device and its application method. The specific technical solutions are as follows:

[0007] In a first aspect, the present invention provides a field water depth measurement device, comprising a measuring tube, a mud clearing reference component, a float, and a liquid level monitoring sensor component;

[0008] A plurality of rows of water inlet holes are provided on the wall of the lower end of the measuring tube; a dividing plate is provided inside the measuring tube, and the dividing plate is placed between the plurality of rows of water inlet holes;

[0009] The float is connected to the liquid level monitoring sensor component, and both are arranged above the dividing plate;

[0010] The mud cleaning reference component includes a reference plate, a guide screw, a mud cleaning scraper and a tension adjustment assembly; the reference plate is slidably sleeved on the outside of the measuring tube; guide screws are respectively arranged on both sides of the reference plate; guide grooves are opened at the positions of the guide screws on both sides of the measuring tube; the mud cleaning scraper is arranged in the measuring tube and is located below the dividing plate, and the two ends of the mud cleaning scraper are fixedly connected to the guide screw through the guide groove; the tension adjustment assembly includes two groups of tension adjustment units for adjusting the reference plate to slide along the guide screw on the outer wall of the measuring tube, and a group of tension adjustment units is arranged at the connection between each guide screw and the reference plate.

[0011] In some embodiments, the liquid level monitoring sensing component includes a main capacity grid plate, a capacity grid sensor and an elastic sealing sleeve; the main capacity grid plate is arranged in the elastic sealing sleeve, one end of which passes through the elastic sealing sleeve and is connected to the float, while the other end passes through the elastic sealing sleeve and is connected to the capacity grid sensor.

[0012] In some embodiments, the capacitive grid sensor includes a secondary capacitive grid plate and a control panel; the secondary capacitive grid plate is coupled to the main capacitive grid plate; and the control panel is provided with an LCD display, a counter, a power button, a reset button, a display button and a battery compartment which are respectively connected to the secondary capacitive grid plate.

[0013] In some embodiments, a water baffle is further provided in the measuring tube, and the water baffle is placed between the main container grid plate and the float;

[0014] A first connecting rod for connecting to the main volume grid plate is provided on the float; and a through hole for the first connecting rod to pass through is provided on the water retaining plate.

[0015] In some embodiments, the field water depth measuring equipment further includes a reset member for resetting the float, the reset member including a second connecting rod, a reset rod, a reset handle and a guide ring; the guide ring is arranged on the outer wall of the measuring tube; the reset rod is arranged along the length direction of the measuring tube and passes through the guide ring; the end of the reset rod close to the float is connected to the second connecting rod, and the end away from the float is connected to the reset handle; the second connecting rod is connected to the first connecting rod.

[0016] In some embodiments, an inner chamfer for forming a wedge-shaped surface is further provided on the inner wall of the lower end of the measuring tube, and the inner chamfer is a chamfer of 30° to 60°;

[0017] The guide groove is connected to the bottom of the measuring tube, and a limit adjustment member for preventing the mud scraper from falling out of the measuring tube is also provided on the wedge-shaped surface of the inner chamfer; the limit adjustment member includes a limit screw.

[0018] In some embodiments, protrusions are provided on the surface of the float that contacts the measuring tube.

[0019] In some embodiments, the field water depth measurement equipment further includes a sealing and leveling assembly and a handle assembly, wherein the sealing and leveling assembly includes a sealing layer and a level gauge, wherein the sealing layer is disposed on the top of the measuring tube, and the level gauge is disposed on the sealing layer; a protective cover is disposed on the level gauge, and the protective cover can be rotatably opened and closed;

[0020] The handle assembly comprises two handle rings symmetrically arranged on the outer wall of the measuring tube.

[0021] In some embodiments, the field water depth measuring equipment further includes a sensor protection component arranged in the measuring tube, the sensor protection component includes a carbon rope, a support rod and a sliding cover, one end of the carbon rope is connected to the capacitive grid sensor, and the other end is connected to the support rod, the sliding cover is arranged above the capacitive grid sensor and connected to the end of the support rod away from the carbon rope.

[0022] In a second aspect, the present invention provides an application method of the field water depth measuring device, comprising the following steps:

[0023] Step S1: Well opening and installation

[0024] First, the operator holds the handle of the field water depth measuring device with both hands, aligns the lower end of the measuring tube with the installation position selected in the field, rotates the measuring tube back and forth and keeps pressing the measuring tube vertically downward until the reference plate is flat against the surface of the paddy field mud layer, stops pressing down and pulls the measuring tube upward;

[0025] Secondly, the field water depth measuring device is offset from its installation position, and the mud cleaning scraper is linked to move along the guide groove by pressing the guide screw, thereby pushing the mud cleaning scraper downward to squeeze out the mud pressed into the measuring tube, so that the measuring tube is cleaned of mud;

[0026] Finally, place the measuring tube vertically into the hole at the installation location until the reference plate is firmly in contact with the mud layer surface. At this time, open the protective cover and fine-tune the field water depth measurement device until the bubble in the level is centered. This completes the installation.

[0027] Step S2: Setting the reference zero position

[0028] After completing the well installation in step S1, turn on the power button of the capacitive barrier sensor, and the water in the hole at the installation location enters the measuring tube through the water inlet on the measuring tube, causing the float to float from the dividing plate under the buoyancy to a stable height. The initial liquid level data can be read from the LCD screen and recorded as the reference zero position;

[0029] If the buoyancy of the float cannot make it float up, the reference plate is adjusted to slide upward along the guide screw on the outer wall of the measuring tube by loosening the two sets of tension adjustment units, thereby raising the position of the reference plate. Subsequently, the two sets of tension adjustment units are tightened to fix the reference plate.

[0030] Then, step S1 is performed again to open the well and install. After the well is opened and installed, the power button of the capacitive barrier sensor is turned on. After the float rises to a stable height, the reading displayed on the LCD screen is the required reference zero position.

[0031] Step S3: Field water depth measurement

[0032] When the water level in the field water layer changes, the liquid level data observed by the field water depth measuring equipment is subtracted from the reference zero value to obtain the current water level change value;

[0033] When monitoring the water level of the field water layer, if the float is blocked or stuck, the float can be reset by pulling the reset component to facilitate the completion of subsequent water level monitoring work;

[0034] Step S4: Cleaning and maintenance

[0035] Turn off the power button of the capacitive sensor, place the lower end of the measuring tube of the used field water depth measuring device in clean water, press the mud cleaning reference component back and forth to clean the mud residue attached to the measuring tube; pull the reset component back and forth to clean the float and the inner wall of the lifting channel in the measuring tube where the float is located;

[0036] If the mud residue cannot be cleaned by pressing the mud cleaning reference component back and forth, remove the limit adjustment part to make the mud cleaning reference component fall out of the measuring tube for thorough cleaning. After the mud residue is cleaned, install the mud cleaning reference component back into the measuring tube for later use.

[0037] The application of the technical solution of the present invention has at least the following beneficial effects:

[0038] (1) The field water depth measurement equipment described in the present invention divides the measuring pipe into an upper water level measurement area and a lower mud cleaning area by setting a partition plate; at the same time, the partition plate can serve as a supporting plate for the float, used to provide bearing capacity for the float when it is at the lowest position; the partition plate can also serve as the highest position for the movement of the mud cleaning scraper in the mud cleaning reference component to ensure that mud residue does not enter the water level measurement area. The mud cleaning reference component needs to perform mud cleaning operations when assisting the well installation of the measuring pipe. Specifically, by pressing the guide screw to link the mud cleaning scraper to move along the guide groove, the mud in the measuring pipe is squeezed out along the measuring pipe and the two guide grooves at three locations, greatly reducing the adhesion between the mud and the inner wall of the measuring pipe, improving the mud cleaning effect, and also facilitating the improvement of water level measurement accuracy. At the same time, compared with the Luoyang shovel, the mud cleaning reference component used in the present invention is suitable for a variety of soils with strong adhesion, and mud cleaning is labor-saving, clean and fast. After mud cleaning, field water enters the measuring pipe along the water inlet hole, and acts on the liquid level monitoring sensor component through the floating action of the float, thereby completing the field water depth measurement. The invention has the advantages of simple structure, convenient carrying, low cost and convenient popularization and use over a large area.

[0039] (2) The application method of the field water depth measuring device described in the present invention has simplified steps, is easy to operate, and all readings are electronic, thus avoiding errors caused by manual readings and greatly improving measurement accuracy.

[0040] In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0042] Figure 1 This is a schematic structural diagram of a field water depth measurement device in Example 1 of the present invention;

[0043] Figure 2 yes Figure 1 Bottom view of

[0044] Figure 3 yes Figure 1 A schematic diagram of the structure of the field water depth measurement equipment in completing step S1;

[0045] Among them, 1. Measuring tube, 1.1. Water inlet hole, 1.2. Dividing plate, 1.3. Water baffle, 1.4. Guide groove, 2. Float, 3. Reference plate, 4. Guide screw, 5. Mud scraper, 6. Tension adjustment unit, 7. Main capacity grid plate, 8. Capacity grid sensor, 8.1. Auxiliary capacity grid plate, 8.2. Control panel, 9. Elastic sealing sleeve, 10. First connecting rod, 11. Second connecting rod, 12. Reset rod, 13. Reset handle, 14. Guide ring, 15. Limit adjustment part, 16. Handle ring, 17. Carbon rope, 18. Support rod, 19. Sliding cover. DETAILED DESCRIPTION

[0046] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention are within the scope of protection of the present invention.

[0047] Example 1:

[0048] See also Figure 1-3 , a field water depth measuring device, comprising a measuring tube 1 (specifically made of stainless steel), a mud clearing reference component, a float 2 and a liquid level monitoring sensor component;

[0049] A plurality of rows of water inlet holes 1.1 are provided on the wall of the lower end of the measuring tube 1; a dividing plate 1.2 is provided inside the measuring tube 1, and the dividing plate 1.2 is placed between the plurality of rows of water inlet holes 1.1;

[0050] The float 2 is connected to the liquid level monitoring sensor component, and both are arranged above the dividing plate 1.2;

[0051] See also Figure 1-2 The mud cleaning reference component includes a reference plate 3, a guide screw 4, a mud cleaning scraper 5 and a tension adjustment assembly; the reference plate 3 is slidably mounted on the outside of the measuring tube 1; the guide screws 4 are symmetrically arranged on both sides of the reference plate 3; guide grooves 1.4 are provided on both sides of the measuring tube 1 at positions corresponding to the guide screws 4; the mud cleaning scraper 5 is arranged inside the measuring tube 1 and is located below the dividing plate 1.2, and the two ends of the mud cleaning scraper 5 pass through the guide grooves 1.4 and are fixedly connected to the guide screws 4; the tension adjustment assembly includes two sets of tension adjustment units 6 for adjusting the reference plate 3 to slide along the guide screws 4 on the outer wall of the measuring tube 1, and a set of tension adjustment units 6 is provided at the connection between each guide screw 4 and the reference plate 3. Specifically, a set of tension adjustment units 6 is mounted on each guide screw 4, and each set of tension adjustment units 6 includes a pair of nuts, and the pair of nuts includes an upper nut arranged above the reference plate 3 and a lower nut arranged below the reference plate 3. If you want to adjust the reference plate 3 to slide along the guide screw 4 on the outer wall of the measuring tube 1, loosen the upper nut or the lower nut in the two sets of tension adjustment units 6; if you want to fix the position of the reference plate 3, tighten the lower nut or the upper nut in the two sets of tension adjustment units 6.

[0052] See also Figure 2-3 The reference plate 3 is an annular plate, and the measuring tube 1 is a long, circular tube. The inner diameter of the reference plate 3 is larger than the outer diameter of the measuring tube 1, ensuring that the reference plate 3 can slide on the measuring tube 1. During well drilling and installation, after the measuring tube 1 is pressed into the soil until the reference plate 3 contacts the mud surface, the downward pressure resistance increases sharply, making further downward pressure difficult. This clearly indicates that the installation depth of the field water depth measurement device has reached the reference position. The reference plate 3 should have a suitably large outer diameter, specifically 120 mm, to increase the contact area between the reference plate 3 and the mud surface, thereby improving the representativeness and accuracy of the reference surface. The thickness of the reference plate 3 should also be appropriately increased (specifically 3 mm) to increase the weight of the lower portion of the field water depth measurement device, effectively lowering the center of gravity of the measuring tube 1, making it less likely to tilt or tip over, and ensuring a smooth process of well drilling, installation, and measurement.

[0053] See also Figure 1The liquid level monitoring sensor assembly includes a main volume grid plate 7, a volume grid sensor 8, and an elastic sealing sleeve 9 (specifically, a silicone rubber sealing sleeve). The main volume grid plate 7 is disposed within the elastic sealing sleeve 9. One end of the main volume grid plate 7 extends through the elastic sealing sleeve 9 and connects to the float 2, while the other end extends through the elastic sealing sleeve 9 and connects to the volume grid sensor 8. Sealant is used at the locations where the main volume grid plate 7 extends through the elastic sealing sleeve 9 to achieve a seal between the elastic sealing sleeve 9 and the main volume grid plate 7.

[0054] The capacity grid sensor 8 includes a secondary capacity grid plate 8.1 and a control panel 8.2; the secondary capacity grid plate 8.1 is coupled to the main capacity grid plate 7; the control panel 8.2 is provided with a liquid crystal display, a counter, a power button, a reset button, a display button and a battery compartment which are respectively connected to the secondary capacity grid plate 8.1.

[0055] A water baffle 1.3 is further provided in the measuring tube 1, and the water baffle 1.3 is placed between the main container grid plate 7 and the float 2;

[0056] A first connecting rod 10 for connecting to the main volume grid plate 7 is provided on the float 2; and a through hole for the first connecting rod 10 to pass through is provided on the water retaining plate 1.3.

[0057] The field water depth measuring equipment also includes a reset component for resetting the float 2, which includes a second connecting rod 11, a reset rod 12, a reset handle 13 and a guide ring 14; the guide ring 14 is arranged on the outer wall of the measuring tube 1; the reset rod 12 is arranged along the length of the measuring tube 1 and passes through the guide ring 14; the end of the reset rod 12 close to the float 2 is connected to the second connecting rod 11, and the end away from the float 2 is connected to the reset handle 13; the second connecting rod 11 is connected to the first connecting rod 10.

[0058] An inner chamfer for forming a wedge-shaped surface is also provided on the inner wall of the lower end of the measuring tube 1. The angle of the inner chamfer is 45°, so that the measuring tube 1 can be easily inserted into the mud layer in the field.

[0059] See also Figure 2 The guide groove 1.4 extends to the bottom of the measuring tube 1. A stopper 15 is provided on the inner chamfered wedge surface to prevent the scraper 5 from falling out of the measuring tube 1. The stopper 15 is a stop screw. The guide groove 1.4 not only provides guidance for the scraper 5 during mud removal operations but also, in combination with the stopper 15, prevents the scraper 5 from falling out of the measuring tube 1. Furthermore, after the stopper 15 is removed, the mud removal reference component can be easily removed from the measuring tube 1 along the guide groove 1.4, facilitating cleaning.

[0060] The surfaces of the float 2 in contact with the measuring tube 1 are provided with protrusions to increase the volume of the float 2 and thereby increase the buoyancy of the float 2. At the same time, the presence of the protrusions reduces the contact area between the float 2 and the inner wall of the measuring tube 1, thereby reducing the friction between the float 2 and the inner wall of the measuring tube 1 and facilitating the floating of the float 2.

[0061] The float 2 is made of a thin stainless steel sheet, which is not easily deformed or corroded, and is subjected to relatively small gravity, thereby improving the floating effect.

[0062] The field water depth measurement device further includes a sealing and leveling assembly and a handle assembly. The sealing and leveling assembly includes a sealing layer and a level. The sealing layer is disposed on the top of the measuring tube 1 to completely block water from entering from above or prevent rain from wetting electronic components such as the grating sensor 8 during observation. The level is disposed on the sealing layer. A protective cover is disposed on the level, and the protective cover can be rotatably opened and closed. Specifically, one end of the protective cover is connected to the top of the measuring tube 1 by a hinge, and the other end is connected to the top of the measuring tube 1 by a butterfly screw. The protective cover is opened or locked on the measuring tube 1 by turning the butterfly screw.

[0063] The handle assembly includes two handle rings 16 (specifically nylon handle rings) symmetrically arranged on the outer wall of the measuring tube 1, which facilitate lifting the field water depth measuring equipment and also facilitate preventing muddy water from flowing back from the bottom.

[0064] See also Figure 1 The field water depth measurement device further includes a sensor protection component disposed within the measurement tube 1. The sensor protection component comprises a carbon rope 17, a support rod 18, and a sliding cover 19. One end of the carbon rope 17 is connected to the capacitive barrier sensor 8, and the other end is connected to the support rod 18. The sliding cover 19 is disposed above the capacitive barrier sensor 8 and connected to the end of the support rod 18 away from the carbon rope 17. The provision of the sensor protection component facilitates the automatic downward sliding and closing of the sliding cover 19 when the field water depth measurement device tilts or falls over, thereby protecting the capacitive barrier sensor 8 and other electronic components from muddy water.

[0065] An application method using the field water depth measuring device comprises the following steps:

[0066] Step S1: Well opening and installation

[0067] See also Figure 3 First, the operator holds the handle ring 16 of the field water depth measuring device with both hands, aligns the lower end of the measuring tube 1 with the installation position selected in the field, rotates the measuring tube 1 back and forth and keeps pressing the measuring tube 1 vertically downward until the reference plate 3 is flat against the surface of the paddy field mud layer, stops pressing down and pulls out the measuring tube 1 upward;

[0068] Secondly, the field water depth measuring device is offset from its installation position, and the guide screw 4 is pressed to link the mud scraper 5 to move along the guide groove 1.4, thereby pushing the mud scraper 5 downward to squeeze out the mud pressed into the measuring tube 1, so that the measuring tube 1 is clean of mud;

[0069] Finally, place the measuring tube 1 vertically into the hole at the installation position until the reference plate 3 is again in smooth contact with the mud layer surface. At this time, open the protective cover and fine-tune the field water depth measurement device until the bubble in the level is centered. The installation is complete.

[0070] Step S2: Setting the reference zero position

[0071] After completing the well installation in step S1, the power button of the capacitive barrier sensor 8 is turned on, and the water in the hole at the installation location enters the measuring tube 1 through the water inlet hole 1.1 on the measuring tube 1, causing the float 2 to float up from the dividing plate 1.2 under the buoyancy force until the height is stable. The initial liquid level data can be read from the LCD screen and recorded as the reference zero position;

[0072] If the buoyancy of the float 2 cannot make it float up, the reference plate 3 is adjusted to slide upward along the guide screw 4 on the outer wall of the measuring tube 1 by loosening the two sets of tension adjustment units 6, thereby raising the position of the reference plate 3, that is, increasing the distance between the reference plate 3 and the mud scraper 5, thereby increasing the depth of the well, thereby increasing the buoyancy of the float 2, ensuring the follow-up and sensitivity of the float 2 to the rise of the water level, and accurately reflecting the changes in the water level;

[0073] Then, step S1 is performed again to open the well and install. After the well is opened and installed, the power button of the capacitance sensor 8 is turned on. After the floating height of the float 2 is stabilized, the reading displayed on the LCD screen is the required reference zero position.

[0074] Step S3: Field water depth measurement

[0075] When the water level in the field water layer changes, the liquid level data observed by the field water depth measuring equipment is subtracted from the reference zero value to obtain the current water level change value;

[0076] Specifically, when the water level in the field water layer rises, the buoyancy of the float 2 pushes the float 2 up, and pushes the first connecting rod to link the main grid plate to rise. When the main grid plate is coupled with the auxiliary grid plate in the grid sensor 8, the relative displacement between the main grid plate and the auxiliary grid plate is converted into a pulse signal through the principle of photoelectric pulse counting, and the water layer displacement is clearly displayed as a number (i.e., the current water level change value) through the counter and LCD screen;

[0077] When monitoring the water level of the field water layer, if the float 2 is blocked or stuck, the float 2 can be reset by pulling the reset component, which is convenient for completing subsequent water level monitoring work; at the same time, the same water level data can be repeatedly monitored by pulling the reset component, which is convenient for improving the water level monitoring accuracy;

[0078] Step S4: Cleaning and maintenance

[0079] Turn off the power button of the capacitive sensor 8, place the lower end of the measuring tube 1 of the used field water depth measuring device in clean water, press the mud cleaning reference component back and forth to clean the mud residue attached to it out of the measuring tube 1; pull the reset component back and forth to clean the float 2 and the inner wall of the lifting channel in the measuring tube 1 where the float 2 is located;

[0080] If the mud residue cannot be cleaned by reciprocating pressing of the mud cleaning reference component, remove the limit adjustment member 15 to remove the mud cleaning reference component from the measuring tube 1 for thorough cleaning. After the mud residue is cleaned, install the mud cleaning reference component back into the measuring tube 1 for future use.

[0081] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A field water depth measurement device, characterized in that: It includes a measuring tube (1), a mud clearing reference component, a float (2) and a liquid level monitoring sensor component; Multiple rows of water inlet holes (1.1) are provided on the wall of the lower end of the measuring tube (1); a dividing plate (1.2) is provided inside the measuring tube (1), and the dividing plate (1.2) is placed between the multiple rows of water inlet holes (1.1); The float (2) is connected to the liquid level monitoring sensor component, and both are arranged above the dividing plate (1.2); The mud cleaning reference component comprises a reference plate (3), a guide screw (4), a mud cleaning scraper (5) and a tension adjustment assembly; the reference plate (3) is slidably sleeved on the outside of the measuring tube (1); the guide screws (4) are respectively arranged on both sides of the reference plate (3); guide grooves (1.4) are provided at positions corresponding to the guide screws (4) on both sides of the measuring tube (1); the mud cleaning scraper (5) is arranged in the measuring tube (1) and is located below the dividing plate (1.2), and the two ends of the mud cleaning scraper (5) pass through the guide grooves (1.4) and are fixedly connected to the guide screw (4); the tension adjustment assembly comprises two groups of tension adjustment units (6) for adjusting the reference plate (3) to slide along the guide screw (4) on the outer wall of the measuring tube (1), and a group of tension adjustment units (6) is provided at the connection between each guide screw (4) and the reference plate (3); The liquid level monitoring sensing component comprises a main volume grid plate (7), a volume grid sensor (8) and an elastic sealing sleeve (9); the main volume grid plate (7) is arranged in the elastic sealing sleeve (9), one end of the main volume grid plate passes through the elastic sealing sleeve (9) and is connected to the float (2), while the other end passes through the elastic sealing sleeve (9) and is connected to the volume grid sensor (8); An inner chamfer for forming a wedge-shaped surface is also provided on the inner wall of the lower end of the measuring tube (1), and the inner chamfer is a chamfer of 30° to 60°; The guide groove (1.4) is connected to the bottom of the measuring tube (1), and a limit adjustment member (15) for preventing the mud scraper (5) from falling out of the measuring tube (1) is also provided on the wedge-shaped surface of the inner chamfer; the limit adjustment member (15) includes a limit screw; It also includes a sealing and leveling component and a handle component, wherein the sealing and leveling component includes a sealing layer and a level, wherein the sealing layer is arranged on the top of the measuring tube (1), and the level is arranged on the sealing layer; a protective cover is arranged on the level, and the protective cover can be rotated to open and close.

2. The field water depth measuring device according to claim 1, characterized in that: The capacitance grid sensor (8) comprises a secondary capacitance grid plate (8.1) and a control panel (8.2); the secondary capacitance grid plate (8.1) is coupled to the primary capacitance grid plate (7); and the control panel (8.2) is provided with a liquid crystal display, a counter, a power button, a reset button, a display button, and a battery compartment, each of which is connected to the secondary capacitance grid plate (8.1).

3. The field water depth measuring device according to claim 2, characterized in that: A water baffle (1.3) is also provided in the measuring tube (1), and the water baffle (1.3) is placed between the main container grid plate (7) and the float (2); A first connecting rod (10) for connecting to the main container grid plate (7) is provided on the float (2); and a through hole for the first connecting rod (10) to pass through is provided on the water retaining plate (1.3).

4. The field water depth measuring device according to claim 3, characterized in that: The invention also includes a reset member for resetting the float (2), the reset member including a second connecting rod (11), a reset rod (12), a reset handle (13) and a guide ring (14); the guide ring (14) is arranged on the outer wall of the measuring tube (1); the reset rod (12) is arranged along the length direction of the measuring tube (1) and passes through the guide ring (14); the end of the reset rod (12) close to the float (2) is connected to the second connecting rod (11), and the end away from the float (2) is connected to the reset handle (13); the second connecting rod (11) is connected to the first connecting rod (10).

5. The field water depth measuring device according to claim 4, characterized in that: Protrusions are provided on the surfaces of the float (2) that contact the measuring tube (1).

6. The field water depth measuring device according to claim 5, characterized in that: The handle assembly comprises two handle rings (16) symmetrically arranged on the outer wall of the measuring tube (1).

7. The field water depth measuring device according to claim 6, characterized in that: The invention also includes a sensor protection component arranged in the measuring tube (1), the sensor protection component including a carbon rope (17), a support rod (18) and a sliding cover (19), one end of the carbon rope (17) is connected to the capacitive grid sensor (8), and the other end is connected to the support rod (18), and the sliding cover (19) is arranged above the capacitive grid sensor (8) and connected to the end of the support rod (18) away from the carbon rope (17).

8. An application method of the field water depth measurement device according to claim 7, characterized in that: The following steps are involved: Step S1: Well opening and installation First, the operator holds the handle ring (16) of the field water depth measuring device with both hands, aligns the lower end of the measuring tube (1) with the installation position selected in the field, rotates the measuring tube (1) back and forth and keeps the measuring tube (1) pressed vertically downward until the reference plate (3) is flat against the surface of the paddy field mud layer, stops pressing downward and pulls out the measuring tube (1) upward; Secondly, the field water depth measuring device is offset from its installation position, and the mud-clearing scraper (5) is linked to move along the guide groove (1.4) by pressing the guide screw (4), thereby pushing the mud-clearing scraper (5) downward to squeeze out the mud pressed into the measuring tube (1), so that the measuring tube (1) is cleaned of mud; Finally, the measuring tube (1) is vertically placed into the hole at the installation position until the reference plate (3) is again firmly attached to the mud layer surface. At this time, the protective cover is opened and the field water depth measuring device is fine-tuned until the bubble in the level is centered, thus completing the installation. Step S2: Setting the reference zero position After completing the well installation in step S1, the power button of the capacitive barrier sensor (8) is turned on, and the water in the hole at the installation position enters the measuring tube (1) through the water inlet hole (1.1) on the measuring tube (1), so that the float (2) is floated from the dividing plate (1.2) by the buoyancy force until it is at a stable height. The initial liquid level data can be read from the LCD screen and recorded as the reference zero position; If the buoyancy of the float (2) cannot make the float float upward, the reference plate (3) is adjusted to slide upward along the guide screw (4) on the outer wall of the measuring tube (1) by loosening the two sets of tension adjustment units (6), thereby raising the position of the reference plate (3), and then tightening the two sets of tension adjustment units (6) to fix the reference plate (3); Then, the step S1 of opening the well and installing is performed again. After the opening and installing of the well is completed, the power button of the capacitance grid sensor (8) is turned on. After the float (2) floats up to a stable height, the reading displayed on the liquid crystal display is the required reference zero position. Step S3: Field water depth measurement When the water level in the field water layer changes, the liquid level data observed by the field water depth measuring equipment is subtracted from the reference zero value to obtain the current water level change value; When monitoring the water level of the field water layer, if the float (2) is blocked or stuck, the float (2) is reset by pulling the reset member, so as to facilitate the completion of subsequent water level monitoring work; Step S4: Cleaning and maintenance Turn off the power button of the capacitive sensor (8), place the lower end of the measuring tube (1) of the used field water depth measuring device in clean water, press the mud cleaning reference component back and forth to clean the mud residue attached to it out of the measuring tube (1); pull the reset component back and forth to clean the float (2) and the inner wall of the lifting channel in the measuring tube (1) where the float (2) is located; If the mud residue cannot be cleaned by reciprocatingly pressing the mud cleaning reference component, the limit adjustment member (15) is disassembled to allow the mud cleaning reference component to be removed from the measuring tube (1) for full cleaning. After the mud residue is cleaned, the mud cleaning reference component is installed back into the measuring tube (1) for later use.

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