An automatic well water level measuring device

Abstract

The utility model relates to the technical field of underground water level measurement, provide a kind of underground water level automatic measuring device, including casing, set in well, casing includes several standard pipes, standard pipe is connected each other by clamping assembly, casing top is connected cylinder cover by clamping assembly, and hanging assembly and measuring assembly are set on cylinder cover, hanging assembly is hung in well mouth brim, measuring assembly is set in the inside of cylinder cover, including pulley, float, scale measuring rope and counterweight, pulley rotation is set on cylinder cover, scale measuring rope is slidably wound on pulley, the both ends of scale measuring rope are connected float and counterweight respectively, float is used to contact the water surface under well and can be lifted with water surface, and counterweight is used to straighten scale measuring rope. The utility model can avoid the adverse effect of water surface sundries when underground water level measurement, improve the accuracy of measurement, and can real-time automatic measurement, avoid staff regular measurement, reduce the labor intensity of staff.

Description

Technical Field

[0001] This utility model relates to the field of downhole water level measurement technology, specifically to an automatic downhole water level measurement device. Background Technology

[0002] Dewatering wells, drainage wells, and recharge wells are three key facilities in groundwater management and engineering protection: Dewatering wells lower the water level by actively pumping out groundwater, ensuring the dryness and safety of the construction area; drainage wells are used to discharge accumulated water or drain seepage water, preventing structural leakage, backflow, and foundation settlement; and recharge wells replenish groundwater resources by injecting water into the aquifer, alleviating settlement or ecological imbalance problems.

[0003] All dewatering wells, drainage wells, and recharge wells require underground water level monitoring. Traditional water level detection methods usually rely on manual labor or simple mechanical devices, such as visually reading the water level by directly contacting the water surface with a measuring rope, measuring rod, or ruler. These methods require regular manual operation, are inefficient and lack real-time performance, are easily affected by environmental interference, and can easily reduce measurement accuracy when there are debris on the water surface in the well. Furthermore, the continuity of measurement is limited, and the labor intensity of the staff is high.

[0004] Therefore, in order to address the above problems, an automatic downhole water level measuring device is proposed. Utility Model Content

[0005] This invention addresses the shortcomings of existing technologies by developing an automatic well water level measuring device. This invention avoids the adverse effects of debris on the water surface during well water level measurement, improves the accuracy of the measurement, and enables real-time automatic measurement, eliminating the need for periodic measurements by staff and reducing their workload.

[0006] To achieve the above objectives, this utility model employs the following technical solution:

[0007] An automatic well water level measuring device includes a casing set inside the well, with its length aligned with the length direction of the well. The casing includes several standard pipes, which are interconnected by snap-fit ​​components. A casing cap is connected to the top of the casing via snap-fit ​​components. A hanging component and a measuring component are mounted on the casing cap. The hanging component is mounted on the edge of the well opening and can connect to well opening edges of different diameters. The measuring component is located inside the casing cap and includes a pulley, a float, a graduated measuring rope, and a counterweight. The pulley is rotatably mounted on the casing cap, and the graduated measuring rope slides around the pulley. The two ends of the graduated measuring rope are connected to the float and the counterweight, respectively. The float is used to contact the water surface in the well and can rise and fall with the water level. The counterweight is used to straighten the graduated measuring rope.

[0008] Preferably, the bottom of the casing contacts the bottom of the well or is 10-20 cm above the bottom of the well.

[0009] Preferably, circumferential protrusions are provided on the outer side of the bottom of the cylinder cover and on the outer sides of both ends of the standard pipe. The diameter of the protrusions is the same, and adjacent and contacting protrusions are connected by a snap-fit ​​assembly. Several water passage holes are evenly opened on the side wall of the standard pipe.

[0010] Preferably, the snap-fit ​​assembly includes a clamp with a groove on the inner side corresponding to the protruding ring. The width of the groove is twice the width of the protruding ring. The clamp is snapped onto the outer side of adjacent and contacting protruding rings to limit the relative displacement between adjacent and contacting protruding rings.

[0011] Preferably, an observation port is provided through the top of the cylinder cover, and the observation port is located directly above the pulley.

[0012] Preferably, the pulley is recessed in the middle for hanging the graduated measuring rope. A limiting wheel is rotatably installed on the cylinder cover directly above the pulley. The axis of the limiting wheel is parallel to the axis of the pulley. Both ends of the pulley's outer wall roll in contact with the limiting wheel. The limiting wheel is used to prevent the graduated measuring rope from falling off the pulley.

[0013] Preferably, the mounting assembly includes a limiting shaft, a mounting plate, and an external shaft. One end of the limiting shaft is connected to one end of the mounting plate, and the other end of the mounting plate is connected to one end of the external shaft. The axes of the limiting shaft and the external shaft are parallel to each other and perpendicular to the surface of the mounting plate. The limiting shaft, the mounting plate, and the external shaft are in an inverted U-shape. The limiting shaft is connected to the cylinder cover, the mounting plate is used to hang on the edge of the wellhead, and the external shaft is used to contact the outer wall of the wellhead. Two sets of mounting assemblies are symmetrically arranged on the cylinder cover, and the maximum distance between the external shafts of the two sets of mounting assemblies is less than the minimum wellhead diameter to be placed.

[0014] Preferably, the limiting shaft is set as a stepped shaft, with the diameter of the end of the limiting shaft away from the hanging plate being larger than the diameter of the end closer to the hanging plate. The axis of the limiting shaft is parallel to the axis of the cylinder cover. The end of the limiting shaft with a smaller diameter slides and rotates to connect with the cylinder cover. Several axial locking teeth are circumferentially arranged on the outer wall of the end of the limiting shaft with a larger diameter. Corresponding tooth grooves are opened on the bottom of the cylinder cover. The locking teeth and tooth grooves can be engaged. The engagement and disengagement between the locking teeth and tooth grooves are achieved by the axial sliding of the end of the limiting shaft with a smaller diameter.

[0015] Preferably, the buoyancy of the float is greater than its weight, the weight of the float is greater than the weight of the counterweight, the weight of the counterweight is greater than its buoyancy, the length of the measuring rope is not greater than the length of the protective sleeve, the measuring rope is marked with a scale and the corresponding specific value, and the center of gravity of the float is the zero point of the scale, and the scale value of the measuring rope increases along the direction of the float towards the counterweight.

[0016] Preferably, an isolation plate is provided on the inner side of the standard tube along the axial direction. The isolation plate is used to divide the inner cavity of the standard tube into two cavities, left and right. The float and the counterweight are located in the cavities on both sides of the isolation plate, and the surfaces of the isolation plate inside the protective tube are all located in the same plane.

[0017] Preferably, positioning pins and positioning holes are respectively provided on the surfaces of adjacent convex rings that are in contact with each other. The positioning pins can be inserted into the positioning holes. At this time, the surfaces of the isolation plates are all located in the same plane, and the axis of the pulley is parallel to the surface of the isolation plate.

[0018] The effects provided in the utility model description are merely those of the embodiments, and not all the effects of the utility model. The above technical solution has the following advantages:

[0019] 1. This utility model, by setting up a protective casing, which is connected by several standard sections, can adapt to the measurement of water surface in wells at various depths. Several water passage holes are opened on the side wall of the standard section for water passage and to isolate debris on the water surface in the well. The measuring component can perform the measurement inside the protective casing, which improves the accuracy of the measurement.

[0020] 2. This utility model sets up a measuring component, which includes a pulley, a float, a graduated measuring rope, and a counterweight. The float is used to contact the water surface in the well and can rise and fall with the water surface. The counterweight is used to straighten the graduated measuring rope, so that the device can automatically measure the depth of the water surface in real time, avoiding repeated timed measurements by the staff and reducing the labor intensity.

[0021] 3. By setting up a hanging component, this utility model enables the device to be applicable to water level measurement needs in wells of various diameters, and at the same time can limit and support the casing, avoiding the impact of casing tilt on measurement accuracy, thus improving its practicality. Attached Figure Description

[0022] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof.

[0023] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model;

[0024] Figure 2 This is a schematic diagram of the connection between the device and the well edge in an embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram of the structure of the standard tube according to an embodiment of the present utility model;

[0026] Figure 4 This is a schematic diagram of the connection between the hanging component and the cylinder cover in an embodiment of the present utility model;

[0027] Figure 5 This is a schematic diagram of the bottom of the cylinder cap according to an embodiment of the present utility model;

[0028] Figure 6This is a schematic diagram of the structure of the hanging component according to an embodiment of the present utility model;

[0029] Figure 7 This is a cross-sectional structural diagram of an embodiment of the present invention in use.

[0030] In the diagram, 1. Casing; 2. Clip-on assembly; 3. Casing cover; 4. Hanging assembly; 5. Measuring assembly; 11. Standard tube; 12. Convex ring; 13. Water passage hole; 14. Isolation plate; 15. Positioning pin; 16. Positioning hole; 21. Clamp; 31. Observation port; 32. Limiting wheel; 41. Limiting shaft; 42. Hanging plate; 43. External shaft; 44. Clamping tooth; 45. Tooth groove; 51. Pulley; 52. Float; 53. Scale measuring rope; 54. Counterweight. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] Example 1

[0033] like Figures 1-7 As shown, an automatic well water level measuring device includes a casing 1, which is installed inside the drainage well, with its length direction aligned with the length direction inside the well. The casing 1 includes several standard pipes 11 connected sequentially, and the standard pipes 11 are interconnected vertically via snap-fit ​​components 2. The top of the casing 1 is also connected to a casing cover 3 via snap-fit ​​components 2. The casing cover 3 is equipped with a hanging component 4 and a measuring component 5. The hanging component 4 is used to hang on the edge of the wellhead and can accommodate different diameters. To meet the connection requirements at the edge of the wellhead, the measuring component 5 is located inside the casing 3 and can extend to the bottom of the casing 1. The measuring component 5 includes a pulley 51, a float 52, a graduated measuring rope 53, and a counterweight 54. The pulley 51 is rotatably mounted on the casing 3, and the graduated measuring rope 53 is slidably wound around the pulley 51. The two ends of the graduated measuring rope 53 are respectively connected to the float 52 and the counterweight 54. The float 52 is used to contact the water surface in the well and can rise and fall with the water surface. The counterweight 54 is used to straighten the graduated measuring rope 53.

[0034] In this embodiment, the bottom of the casing 1 contacts the bottom of the well, providing support at the bottom of the casing 1 and improving stability. Preferably, in another embodiment, the bottom of the casing 1 is 10-20 cm higher than the bottom of the well to avoid adverse effects from other equipment at the bottom of the well on the casing 1, thus improving practicality.

[0035] In this embodiment, the buoyancy of the float 52 is greater than its weight, the weight of the float 52 is greater than the weight of the counterweight 54, and the weight of the counterweight 54 is greater than its buoyancy, so that the counterweight 54 can straighten the scale measuring rope 53 even when it enters the water. The float 52 is made of a material that can float on the water surface, such as a wooden board, and the counterweight 54 is made of a metal material such as steel or iron. The length of the scale measuring rope 53 is the same as the length of the protective sleeve 1. The scale measuring rope 53 is made of a lightweight material, and its own weight is negligible. The scale measuring rope 53 is set with a scale and marked with the corresponding specific values, and the center of gravity of the float 52 is the zero point of the scale. The scale value of the scale measuring rope 53 increases from the float 52 toward the counterweight 54.

[0036] In this embodiment, circumferential protrusions 12 are provided on the outer side of the bottom end of the cylinder cover 3 and on the outer sides of both ends of the standard pipe 11. The diameter of the protrusions 12 is the same, which facilitates connection. The protrusions 12 that are adjacent and in contact are connected by a snap-fit ​​assembly 2, so as to adapt to the use of dewatering wells of different depths by increasing or decreasing the number of standard pipes 11. Several water passage holes 13 are evenly and circumferentially opened on the side wall of the standard pipe 11 to facilitate the water in the well to enter the inner cavity of the casing 1, so as to avoid affecting the accuracy of the measurement results. Preferably, the water passage holes 13 are arranged in a cross pattern to avoid affecting the structural strength of the standard pipe 11. More preferably, a filter screen is provided in the water passage hole 13 to enhance the effect of filtering impurities in the water.

[0037] In this embodiment, the snap-fit ​​assembly 2 includes a clamp 21. The inner side of the clamp 21 is provided with a groove corresponding to the convex ring 12. The width of the groove is twice the width of the convex ring 12. The clamp 21 is snapped onto the outer side of the adjacent and contacting convex rings 12 to limit the relative displacement between the adjacent and contacting convex rings 12. Preferably, the clamp 21 adopts a common clamp 21 structure on the market, namely two curved strip bodies and connecting bolts connecting the strip bodies, which is more economical.

[0038] In this embodiment, an observation port 31 is provided above the cylinder cover 3. The observation port 31 is located directly above the pulley 51 and faces the scale measuring rope 53 placed on the pulley 51, which makes it convenient for staff to quickly read the scale reading.

[0039] In this embodiment, the mounting assembly 4 includes a limiting shaft 41, a mounting plate 42, and an external shaft 43. One end of the limiting shaft 41 is connected to one end of the mounting plate 42, and the other end of the mounting plate 42 is connected to one end of the external shaft 43. The axes of the limiting shaft 41 and the external shaft 43 are parallel to each other and perpendicular to the surface of the mounting plate 42. The mounting plate 42 is made of high-strength thin metal plate material, which does not affect the installation of the well cover while supporting the casing 1. The limiting shaft 41, the mounting plate 42, and the external shaft 43 are in an inverted U-shape. The limiting shaft 41 is connected to the casing cover 3, the mounting plate 42 is used to hang on the edge of the well opening, and the external shaft 43 is used to contact the outer wall of the well opening. Two sets of mounting assemblies 4 are symmetrically arranged on the casing cover 3, and the maximum distance between the external shafts 43 of the two sets of mounting assemblies 4 is less than the minimum well opening diameter to be placed, so as to avoid the mounting assembly 4 being unable to limit the casing 1, thus improving the practicality of the device.

[0040] Example 2

[0041] Based on Example 1, such as Figures 5-6 As shown, in this embodiment, the limiting shaft 41 is configured as a two-section stepped shaft. The diameter of the end of the limiting shaft 41 away from the hanging plate 42 is larger than the diameter of the end closer to the hanging plate 42. The end of the limiting shaft 41 with a smaller diameter slides and rotates to connect to the casing 3. The axis of the limiting shaft 41 is parallel to the axis of the casing 3. Several axially oriented locking teeth 44 are provided on the outer wall of the end of the limiting shaft 41 with a larger diameter. The bottom of the casing 3 has a tooth groove 45 corresponding to the locking teeth 44. The locking teeth 44 can engage with the tooth groove 45. The engagement and disengagement between the locking teeth 44 and the tooth groove 45 can be achieved by the axial sliding of the end of the limiting shaft 41 with a smaller diameter. When engaged, the limiting shaft 41 cannot rotate. When disengaged, the limiting shaft 41 can rotate to adapt to and limit the connection with wellheads of different diameters through the hanging components 4 on both sides, so as to prevent the casing 1 from tilting in the well.

[0042] Example 3

[0043] Based on Example 1, such as Figure 4 As shown, the pulley 51 of the measuring component 5 is recessed in the middle to hang and accommodate the sliding of the graduated measuring rope 53. A limiting wheel 32 is rotatably installed on the cylinder cover 3 directly above the pulley 51. The axis of the limiting wheel 32 is parallel to the axis of the pulley 51. The outer walls of both ends of the pulley 51 roll in contact with a limiting wheel 32. The limiting wheels 32 at both ends are used to prevent the graduated measuring rope 53 from falling off the pulley 51 when it slides, thus improving the stability of the device.

[0044] Example 4

[0045] Based on Example 1, such as Figure 3As shown, an isolation plate 14 is provided on the inner side of the standard tube 11 along its axial direction. The isolation plate 14 is used to divide the inner cavity of the standard tube 11 into two cavities, left and right. Preferably, the isolation plate 14 is located on the center line of the standard tube 11, so that the two cavities are the same size, which facilitates quick assembly and connection when connecting the standard tube 11. The float 52 and the counterweight 54 are located in the cavities on both sides of the isolation plate 14, respectively, to avoid the scale measuring rope 53 in the protective tube 1 from getting tangled and affecting the measurement accuracy. The plate surfaces of the isolation plate 14 in the protective tube 1 are all located in the same plane. More preferably, several through holes are uniformly opened on the isolation plate 14.

[0046] In this embodiment, positioning pins 15 and positioning holes 16 are respectively provided on the surfaces of adjacent convex rings 12 that are in contact with each other. The positioning pins 15 can be inserted into the positioning holes 16. At this time, the plate surfaces of the isolation plate 14 are all located in the same plane, which further improves the efficiency of the connection between the standard tubes 11 and the connection between the protective cylinder 1 and the cylinder cover 3. The axis of the pulley 51 is parallel to the plate surface of the isolation plate 14, so that both ends of the scale measuring rope 53 connecting the float 52 and the counterweight 54 can be vertically inserted into the bottom of the protective cylinder 1, avoiding the twisting of the scale measuring rope 53 from affecting the accuracy of the measurement.

[0047] In another embodiment, a handle is also included, which is located on the top of the cylinder cover 3 and does not affect the observation through the observation port 31, making it convenient to lift the device.

[0048] In another embodiment, a bottom sealing plate is also included. The bottom sealing plate can be connected to the bottom end of the casing 1 through the snap-fit ​​assembly 2 and close the opening at the bottom end of the casing 1 to prevent debris on the water surface from entering the inner cavity of the casing 1 when the casing 1 is placed into the well.

[0049] Working principle: First, a casing 1 is formed by connecting a standard pipe 11 according to the well depth, which is known during drilling. Then, a graduated measuring rope 53 is cut according to the length of the casing 1 and hung on a pulley 51. A float 52 and a counterweight 54 are connected to both ends of the graduated measuring rope 53, respectively. The float 52 and counterweight 54 are placed inside the casing 1. A casing cap 3 is then connected to the top of the casing 1 to close the opening at the bottom. The casing 1 is then placed into the well. The limiting shaft 41 is slid downwards, disconnecting the connection between the locking teeth 44 and the tooth groove 45. The limiting shaft 41 is rotated according to the size of the well opening to ensure that the external shafts 43 of the two hanging components 4 are in contact. The outer walls of the wellhead on both sides of the casing 1 are closed, and the casing 1 is pressed against the inner wall of the well. When the casing 1 is released, due to the weight of the casing 1 and the casing cover 3, the limiting shaft 41 returns to its original position, and the locking teeth 44 and the tooth groove 45 are engaged, preventing the rotation of the limiting shaft 41. Under the combined action of the weight of the counterweight 54 and the buoyancy of the float 52, the scale measuring rope 53 is located on the pulley 51. The reading of the scale measuring rope 53 directly below the observation port 31 is the depth of the water surface in the well. It can be placed in the well indefinitely, and can be changed in real time even if the water level drops or rises. It realizes automatic measurement without power, reduces the labor intensity of the staff who need to measure frequently, and has better economy and practicality.

[0050] Any aspects of this utility model that are not detailed herein are conventional technical means known to those skilled in the art.

[0051] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0052] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "multiple" means two or more unless otherwise explicitly specified.

[0053] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

[0054] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An automatic well water level measuring device, characterized in that: The well includes a casing (1), which is installed inside the well and its length direction is consistent with the length direction inside the well. The casing (1) includes several standard pipes (11), which are connected to each other by a snap-fit ​​assembly (2). The top of the casing (1) is connected to a casing cover (3) by the snap-fit ​​assembly (2). The casing cover (3) is equipped with a hanging assembly (4) and a measuring assembly (5). The hanging assembly (4) is hung on the edge of the wellhead and can be connected to the edge of the wellhead with different diameters. The measuring assembly (5) The measuring component (5) is set inside the cylinder cover (3). It includes a pulley (51), a float (52), a graduated measuring rope (53), and a counterweight (54). The pulley (51) is set on the cylinder cover (3). The graduated measuring rope (53) is slidably wound on the pulley (51). The two ends of the graduated measuring rope (53) are connected to the float (52) and the counterweight (54) respectively. The float (52) is used to contact the water surface in the well and can rise and fall with the water surface. The counterweight (54) is used to straighten the graduated measuring rope (53).

2. The automatic well water level measuring device according to claim 1, characterized in that: The bottom of the casing (1) contacts the bottom of the well or is 10-20 cm above the bottom of the well.

3. The automatic well water level measuring device according to claim 1, characterized in that: A circumferential protrusion ring (12) is provided on the outer side of the bottom end of the cylinder cover (3) and on the outer side of both ends of the standard tube (11). The diameters of the protrusion rings (12) are the same, and adjacent and contacting protrusion rings (12) are connected by a snap-fit ​​assembly (2). Several water passage holes (13) are evenly opened on the side wall of the standard pipe (11).

4. The automatic well water level measuring device according to claim 3, characterized in that: The snap-fit ​​assembly (2) includes a clamp (21). The inner side of the clamp (21) is provided with a groove corresponding to the protruding ring (12). The width of the groove is twice the width of the protruding ring (12). The clamp (21) is snapped on the outer side of the adjacent and contacting protruding rings (12) to limit the relative displacement between the adjacent and contacting protruding rings (12).

5. The automatic downhole water level measuring device according to claim 4, characterized in that: An observation port (31) is provided above the cylinder cover (3), and the observation port (31) is located directly above the pulley (51).

6. The automatic downhole water level measuring device according to claim 5, characterized in that: The pulley (51) is recessed in the middle for hanging the graduated measuring rope (53). A limiting wheel (32) is rotatably installed on the cylinder cover (3) directly above the pulley (51). The axis of the limiting wheel (32) is parallel to the axis of the pulley (51). The outer walls of both ends of the pulley (51) roll in contact with the limiting wheel (32). The limiting wheel (32) is used to prevent the graduated measuring rope (53) from falling off the pulley (51).

7. The automatic downhole water level measuring device according to claim 5, characterized in that: The mounting assembly (4) includes a limiting shaft (41), a mounting plate (42), and an external shaft (43). One end of the limiting shaft (41) is connected to one end of the mounting plate (42), and the other end of the mounting plate (42) is connected to one end of the external shaft (43). The axes of the limiting shaft (41) and the external shaft (43) are parallel to each other and perpendicular to the plate surface of the mounting plate (42). The limiting shaft (41), the mounting plate (42), and the external shaft (43) are in an inverted U-shape. The limiting shaft (41) is connected to the cylinder cover (3). The mounting plate (42) is used to hang on the edge of the wellhead, and the external shaft (43) is used to contact the outer wall of the wellhead. Two sets of the mounting components (4) are symmetrically arranged on the cylinder cover (3), and the maximum distance between the outer shafts (43) of the two sets of mounting components (4) is less than the minimum wellhead diameter to be placed.

8. The automatic well water level measuring device according to claim 7, characterized in that: The limiting shaft (41) is set as a stepped shaft. The diameter of the end of the limiting shaft (41) away from the hanging plate (42) is larger than the diameter of the end close to the hanging plate (42). The axis of the limiting shaft (41) is parallel to the axis of the cylinder cover (3). The end of the limiting shaft (41) with a smaller diameter slides and rotates to connect with the cylinder cover (3). Several axial locking teeth (44) are arranged circumferentially on the outer wall of the end of the limiting shaft (41) with a larger diameter. The bottom of the cylinder cover (3) is opened with a tooth groove (45) corresponding to the locking teeth (44). The locking teeth (44) and the tooth groove (45) can be locked together. The locking teeth (44) and the tooth groove (45) are locked together and disconnected by the axial sliding of the end of the limiting shaft (41) with a smaller diameter.

9. The automatic well water level measuring device according to claim 8, characterized in that: The buoyancy of the float (52) is greater than its weight, the weight of the float (52) is greater than the weight of the counterweight (54), the weight of the counterweight (54) is greater than its buoyancy, the length of the scale measuring rope (53) is not greater than the length of the protective sleeve (1), the scale measuring rope (53) is set with a scale and marked with the corresponding specific value, and the center of gravity of the float (52) is the zero point of the scale, and the scale value of the scale measuring rope (53) increases along the direction of the float (52) towards the counterweight (54).

10. The automatic downhole water level measuring device according to claim 9, characterized in that: An isolation plate (14) is installed on the inner side of the standard tube (11) along the axial direction. The isolation plate (14) is used to divide the inner cavity of the standard tube (11) into two cavities, left and right. The float (52) and the counterweight (54) are located in the cavities on both sides of the isolation plate (14), and the plate surfaces of the isolation plate (14) in the protective sleeve (1) are all located in the same plane. Positioning pins (15) and positioning holes (16) are respectively provided on the surfaces of adjacent convex rings (12) that are in contact with each other. The positioning pins (15) can be inserted into the positioning holes (16). At this time, the plate surfaces of the isolation plate (14) are all located in the same plane, and the axis of the pulley (51) is parallel to the plate surface of the isolation plate (14).

Images