Contact type water gauge outside well

Abstract

The invention provides a contact type outside-well water gauge, which belongs to the technical field of underground water level measurement, and comprises an induction contact tape measure assembly, a decomposition well assembly and an instrument table assembly, the induction contact tape measure assembly comprises a heavy hammer, a measuring tape measure and an inductor, the interior of the heavy hammer is hollow and is provided with a containing cavity used for containing the measuring tape measure, the upper end of the heavy hammer is provided with a buckle structure used for fixing the measuring tape measure, one end of the measuring tape measure is fixedly connected with the heavy hammer, and the other end of the measuring tape measure is fixedly connected with the inductor; the decomposition well assembly comprises a plurality of sections of well pipes, the well pipes are cylindrical pipe bodies, threaded connection structures are arranged at the two ends of the well pipes, and a plurality of water through holes are formed in the side walls of the well pipes; the instrument table assembly comprises a supporting frame, a pulley block and a reading pointer, the supporting frame is made of stainless steel, the pulley block is arranged at the upper end of the supporting frame, the reading pointer is fixed to the supporting frame and located under the pulley block, the induction contact measuring tape assembly is erected on the pulley block, and the decomposition well assembly is connected with the supporting frame through a fixing structure.

Description

Technical Field

[0001] The invention belongs to the technical field of groundwater level measurement, and in particular relates to a contact-type external well water gauge. Background Art

[0002] Tide, as a key project of marine hydrological observation, is of great significance to promoting marine economy, disaster prevention and mitigation, engineering construction, environmental protection and port development. As the core facility of tide gauge, the water gauge outside the well is crucial to ensure the accuracy of tidal data.

[0003] The water gauge outside the well can record the water level in real time and accurately, providing basic data for the compilation of tide tables, forecast production, calculation of tidal harmonic constants and mean sea level, and supporting marine scientific research, port planning and other work. In addition, it can also be used to calibrate the water level gauge. By comparing the readings of the water gauge inside and outside the well, it is observed once at high, medium and low tides, and at least three sets of tide level values ​​are read each time to verify its accuracy and reliability. This verification process is carried out once a month to ensure data consistency. At the same time, the changes in the readings of the water gauge outside the observation well can preliminarily determine the status of the tide well and provide a basis for timely maintenance.

[0004] The selection of the water level observation point outside the well must be cautious. It should be located in an open sea area with smooth water flow, not prone to siltation and little wave impact, away from the coast with severe erosion and prone to collapse, to ensure that the water depth exceeds 1 meter at the theoretical lowest tide level.

[0005] In recent years, the development and utilization of groundwater resources have become increasingly frequent, and its water level monitoring is crucial to ecological protection and water resource management. The existing direct observation method of groundwater level requires manual measurement in the well, which is limited by measurement conditions, inconvenient to operate and has safety hazards. Summary of the invention

[0006] In view of this, the present invention provides a contact-type external well water gauge, which has few restrictions on measurement conditions, does not require manual on-site logging into the wellbore, and is easy and safe to operate.

[0007] The present invention is achieved in that: The present invention provides a contact-type well water gauge, which includes: an inductive contact tape measure assembly, a decomposition well assembly and an instrument platform assembly; the inductive contact tape measure assembly includes a weight, a measuring tape measure and a sensor, the weight is hollow inside and is provided with a storage cavity for accommodating the measuring tape measure, the upper end of the weight is provided with a buckle structure for fixing the measuring tape measure, one end of the measuring tape measure is fixedly connected to the weight, and the other end is fixedly connected to the sensor; the decomposition well assembly includes a plurality of well pipes, the well pipe is a cylindrical pipe body with an inner diameter of 100 to 150 mm, both ends of the well pipe are provided with threaded connection structures, and a plurality of water holes are opened on the side wall of the well pipe; the instrument platform assembly includes a support frame, a pulley block and a reading pointer, the support frame is made of stainless steel, the pulley block is arranged at the upper end of the support frame, the reading pointer is fixed on the support frame and is located directly below the pulley block, the inductive contact tape measure assembly is erected on the pulley block, and the decomposition well assembly is connected to the support frame through a fixed structure.

[0008] On the basis of the above technical solution, the contact type well external water gauge of the present invention can also be improved as follows: Among them, the support frame includes a base, a column and a beam, the base is fixed on the mounting platform, the column is vertically fixed on the base, the beam is horizontally fixed on the top of the column, the pulley group includes a first pulley and a second pulley, the first pulley and the second pulley are respectively rotatably set at both ends of the beam, and the reading pointer is vertically fixed in the middle of the beam.

[0009] Furthermore, the heavy hammer includes a hammer body, a hammer cover and a fixing sleeve. The hammer body is cylindrical and hollow inside to form the storage cavity. The hammer cover is connected to the top of the hammer body through a threaded structure. The fixing sleeve is fixed to the upper end of the hammer cover. The fixing sleeve is provided with the buckle structure, and the buckle structure includes an elastic claw and a clamping block. The measuring tape is fixed by the elastic claw after passing through the fixing sleeve.

[0010] Furthermore, the sensor includes an outer shell, a contact rod and a detection head. A sealed cavity is provided inside the outer shell. The contact rod is inserted into the sealed cavity and one end is fixedly connected to the detection head. The other end of the contact rod is fixedly connected to a measuring tape. A waterproof sealing ring is provided on the outer surface of the outer shell.

[0011] Furthermore, the well pipe includes a pipe body, a first connecting end and a second connecting end, the pipe body is made of plastic, the first connecting end is provided with an external thread, the second connecting end is provided with an internal thread, and the water holes are evenly distributed along the circumference of the pipe body and arranged in a plum blossom shape.

[0012] Furthermore, the support frame is arranged in a stainless steel distribution box, the distribution box includes a box body and a box door, the box body is fixed on the installation platform, the box door is hinged to the box body through a hinge structure, and an observation window is arranged on the box door, and the observation window corresponds to the reading pointer.

[0013] Furthermore, the fixing structure includes a fixing seat and a bayonet assembly, the fixing seat is fixed to the bottom of the support frame, the bayonet assembly includes a first clamping plate and a second clamping plate, the first clamping plate and the second clamping plate are relatively arranged and fixed by bolts, and the top of the decomposition well assembly passes through the bayonet assembly and is fixed.

[0014] Furthermore, the pulley block includes a pulley body, a pulley shaft and a bearing. The outer peripheral surface of the pulley body is provided with a groove for limiting the measuring tape. Both ends of the pulley shaft are connected to the support frame through bearings, and the pulley body is fixed to the pulley shaft through a key connection.

[0015] Furthermore, the detection head includes a probe body and a sensing contact, the probe body is in a conical structure, the sensing contact is arranged on the surface of the probe body and is electrically connected to the contact rod, and the outer surface of the probe body is provided with an anti-corrosion coating.

[0016] Furthermore, the mutual relationship between the sizes of the weight and the measuring tape, and the mutual relationship between the distribution positions of the water holes in the well pipe are defined by the limiting equations of the matching relationship between the weight and the measuring tape and the distribution positions of the water holes in the well pipe.

[0017] The limiting equations between the components are: (I) The limiting equation for the relationship between the weight and the measuring tape: The size matching relationship between the internal storage cavity of the weight and the measuring tape is specifically expressed as follows: ; In the formula, is the inner diameter of the receiving cavity ( ,Default range ); To measure the tape width ( ,Default range ); For installation clearance ( ,Default range ); is the length influence coefficient (default range ); To measure the tape length ( ); is the inner diameter machining error ( ).

[0018] Parameter acquisition method: 1. Get: Step 1: Use a micrometer (precision ) Take 5 points evenly along the length of the tape measure; Step 2: Calculate the average: ; In the formula, For the The width value of each measuring point ( ).

[0019] The principle of this equation is: the basic size term Determine minimum space requirements; clearance items Ensure assembly feasibility; length influences Considering the change of tape tightness, the square root relationship is used because the winding tightness decreases with the increase of length; the error term Consider machining and assembly errors.

[0020] 2. Get: Step 1: Prepare 3 different lengths ( ) Step 2: Measure the corresponding minimum inner diameter requirement ( ); Step 3: Solve by least squares method: .

[0021] (II) The equation for the distribution position of the water holes in the well pipe is: The circumferential and axial distribution positions of the well pipe water holes are specifically shown as follows: ; In the formula, For the The spatial coordinates of the water holes (mm); is the well pipe diameter (mm, default range 100-150mm); The number of water holes per layer (the default range is 4-6); The distance between the first-layer water hole and the end of the well pipe (mm, the default range is 50-100mm); The spacing between water holes in adjacent layers (mm, default range is 200-300mm); is the position error in each direction (mm).

[0022] The principles of this equation include: using a cylindrical coordinate system to describe the spatial distribution; using trigonometric functions for circumferential uniform distribution; using linear relationships for axial equidistant distribution; and taking into account processing and installation deviations in the error term.

[0023] The following is the equation for data collection using the precise calculation of the contact-type well water gauge: (III) Calculation equation for the measurement accuracy of inductive contact tape: The relationship between the measurement accuracy of the inductive contact tape and each component is specifically expressed as follows: ; In the formula, is the measurement accuracy (mm, recommended value ≤0.5mm); is the contact sensing force (N, default range 0.5-2N); is the weight of the hammer (kg, default range 0.5-2kg); is the tape measure tension (N, default range 5-20N); is the curvature radius of the tape measure (m, default range 0.02-0.05m); is the bearing damping coefficient (N·s / m, default range 0.1-0.5N·s / m); is the fitting coefficient; is the precision error term (mm).

[0024] The equation is based on the following principles: the inverse relationship is used to reflect the restrictive effect of the factors; the induction force term Indicates the inductive capacity per unit mass; tension term Reflects the influence of the bending degree of the tape measure; damping term Reflect dynamic response characteristics.

[0025] (IV) Calculation equation for water level difference inside and outside the well: The relationship between the water level difference inside and outside the decomposition well is specifically expressed as follows: ; In the formula, is the water level difference inside and outside the well (m); The flow rate of the water inlet (m / s, the default range is 0.1-0.5m / s); is the acceleration due to gravity (9.81m / s²); For the Water inlet area (m²); is the cross-sectional area of ​​the wellbore (m²); is the water inlet hole diameter (m, default range 0.01-0.02m); is the wellbore diameter (m, default range 0.08-0.15m); The number of water inlet holes (the default range is 4-8); is the fitting coefficient; is the water level difference error term (m).

[0026] Parameter acquisition method: 1. Mechanical parameters ( ) to obtain: Step 1: Use a miniature force sensor (range 0-5N, accuracy 0.01N) to measure the contact sensing force; Step 2: Use a tension sensor (range 0-50N, accuracy 0.1N) to measure the tape tension; Step 3: Determine the bearing damping coefficient by torsional vibration method. The specific calculation formula is: ; In the formula, is the bearing moment of inertia (kg·m²); is the natural frequency (Hz); is the adjacent amplitude (m).

[0027] 2. Fluid parameters ( ) to obtain: Step 1: Use an electromagnetic flowmeter to measure the flow velocity at the water inlet; Step 2: Use a precision caliper (accuracy 0.02mm) to measure the size of the water inlet hole; Step 3: Calculate area parameters: .

[0028] 3. Geometric parameters ( ) to obtain: Step 1: Use the water displacement method to measure the volume of the inner cavity of the weight; Step 2: Use a micrometer (accuracy 0.001mm) to measure the thickness of the tape; Step 3: Use an inside micrometer (accuracy 0.001mm) to measure the inside diameter of the weight.

[0029] 4. Angle and tension parameters ( ) to obtain: Step 1: Use an inclinometer (accuracy 0.1°) to measure the tangential angle of the tape measure under different working conditions; Step 2: Use a tension sensor to measure the tape tension under the corresponding working conditions.

[0030] This equation is based on the following principle: The dynamic pressure term Based on Bernoulli's equation; area ratio term Reflects circulation capacity; index item Reflect the aperture effect.

[0031] The contact-type external well water gauge of the present invention can quickly and accurately measure the groundwater level outside the well, providing an effective tool for monitoring and management of groundwater resources. Compared with the prior art, the device has the following advantages: 1. Simple installation, no need to enter the well, easy operation, can greatly reduce the risk of manual measurement. The external structure is reasonably designed, with high reliability, effectively preventing the influence of harsh environment on measurement accuracy.

[0032] 2. Adopt induction contact tape measure mechanism, with excellent measurement accuracy. Can be calculated The measurement accuracy within millimeters meets the requirements of groundwater level monitoring.

[0033] 3. The structure is simple and compact, the materials used have good corrosion resistance, can adapt to complex well environment, and the maintenance workload is small, which greatly reduces the operating cost.

[0034] 4. Through the size matching relationship between the inner cavity of the weight hammer and the measuring tape and the distribution optimization design of the water holes in the well pipe, and , further improving the measurement stability and reliability.

[0035] 5. The combined design of the decomposition well assembly and the instrument table assembly can be used according to The water level difference inside and outside the well is calculated to provide effective data support for groundwater level analysis.

[0036] In summary, the contact-type external well water gauge of the present invention significantly reduces the complexity of installation and maintenance while ensuring high-precision measurement, thereby greatly improving the practicality and economy of groundwater level monitoring. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0038] In the accompanying drawings, the components represented by the reference numerals are listed as follows: Figure 1 A schematic diagram of the use of a contact-type external well water gauge; Figure 2 A schematic diagram of a sensor for a contact-type external well water gauge; In the accompanying drawings, the components represented by the reference numerals are listed as follows: 1. Inductive contact tape measure assembly; 11. Weight; 12. Measuring tape measure; 13. Sensor; 131. Outer shell; 132. Contact rod; 133. Detection head; 1331. Main body; 1332. Inductive contact; 2. Decomposition well assembly; 3. Instrument table assembly; 31. Support frame; 311. Base; 312. Column; 313. Beam; 32. Pulley block; 33. Reading pointer. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0040] like Figure 1 , Figure 2 As shown, it is a first embodiment of a contact type well water gauge provided by the present invention. In this embodiment, it includes: an inductive contact tape measure assembly 1, a decomposition well assembly 2 and an instrument table assembly 3; the inductive contact tape measure assembly 1 includes a weight 11, a measuring tape 12 and a sensor 13, the weight 11 is hollow inside and is provided with a storage cavity for accommodating the measuring tape 12, the upper end of the weight 11 is provided with a buckle structure for fixing the measuring tape 12, one end of the measuring tape 12 is fixedly connected to the weight 11, and the other end is fixedly connected to the sensor 13; the decomposition well assembly 2 includes multiple sections of well pipes, which are cylindrical pipes with an inner diameter of 100-150 mm. Both ends of the well pipes are provided with threaded connection structures, and the side walls of the well pipes are provided with multiple water holes; the instrument table assembly 3 includes a support frame 31, a pulley block 32 and a reading pointer 33. The support frame 31 is made of stainless steel, the pulley block 32 is arranged at the upper end of the support frame 31, the reading pointer 33 is fixed on the support frame 31 and is located directly below the pulley block 32, the induction contact tape assembly 1 is set on the pulley block 32, and the decomposition well assembly 2 is connected to the support frame 31 through a fixed structure.

[0041] Among them, in the above technical solution, the support frame 31 includes a base 311, a column 312 and a beam 313, the base 311 is fixed on the mounting platform, the column 312 is vertically fixed on the base 311, the beam 313 is horizontally fixed to the top of the column 312, the pulley group 32 includes a first pulley and a second pulley, the first pulley and the second pulley are respectively rotatably arranged at both ends of the beam 313, and the reading pointer 33 is vertically fixed to the middle of the beam 313.

[0042] Furthermore, in the above technical solution, the heavy hammer 11 includes a hammer body, a hammer cover and a fixed sleeve. The hammer body is cylindrical and hollow inside to form a storage cavity. The hammer cover is connected to the top of the hammer body through a threaded structure. The fixed sleeve is fixed to the upper end of the hammer cover. A snap structure is provided in the fixed sleeve. The snap structure includes an elastic claw and a clamping block. The measuring tape 12 is fixed by the elastic claw after passing through the fixed sleeve.

[0043] Furthermore, in the above technical solution, the sensor 13 includes an outer shell 131, a contact rod 132 and a detection head 133. A sealed cavity is provided in the outer shell 131. The contact rod 132 is inserted into the sealed cavity and one end is fixedly connected to the detection head 133. The other end of the contact rod 132 is fixedly connected to the measuring tape 12. A waterproof sealing ring is provided on the outer surface of the outer shell 131.

[0044] Furthermore, in the above technical solution, the well pipe includes a pipe body, a first connecting end and a second connecting end. The pipe body is made of plastic, the first connecting end is provided with an external thread, the second connecting end is provided with an internal thread, and the water holes are evenly distributed along the circumference of the pipe body and arranged in a plum blossom shape.

[0045] Furthermore, in the above technical solution, the support frame 31 is arranged in a stainless steel distribution box, the distribution box includes a box body and a box door, the box body is fixed on the installation platform, the box door is hinged to the box body through a hinge structure, and an observation window is provided on the box door, and the observation window is set corresponding to the reading pointer 33.

[0046] Furthermore, in the above technical solution, the fixing structure includes a fixing seat and a bayonet assembly, the fixing seat is fixed to the bottom of the support frame 31, the bayonet assembly includes a first clamping plate and a second clamping plate, the first clamping plate and the second clamping plate are relatively arranged and fixed by bolts, and the top of the decomposition well assembly 2 passes through the bayonet assembly and is fixed.

[0047] Furthermore, in the above technical solution, the pulley group 32 includes a pulley body 1331, a pulley shaft and a bearing. The outer peripheral surface of the pulley body 1331 is provided with a groove for limiting the measuring tape 12. The two ends of the pulley shaft are connected to the support frame 31 through bearings, and the pulley body 1331 is fixed to the pulley shaft through a key connection.

[0048] Furthermore, in the above technical solution, the detection head 133 includes a probe body 1331 and a sensing contact 1332, the probe body 1331 is a conical structure, the sensing contact 1332 is arranged on the surface of the probe body 1331 and is electrically connected to the contact rod 132, and the outer surface of the probe body 1331 is provided with an anti-corrosion coating.

[0049] Furthermore, in the above technical solution, the size relationship between the weight 11 and the measuring tape 12 and the distribution position relationship of the water holes in the well pipe are defined by the equation defining the matching relationship between the weight 11 and the measuring tape 12 and the distribution position definition equation of the water holes in the well pipe.

[0050] The structure and function of each component are as follows: 1. The structure and function of the inductive contact tape measure assembly: Weight: It is cylindrical in shape and hollow inside to accommodate the measuring tape. The weight shell is made of metal and has a buckle structure inside to fix the measuring tape. The default range is .

[0051] Measuring tape: Tape width The default range is .according to Determine tape measure length The diameter of the inner cavity of the hammer Size matching relationship; in, Indicates the diameter of the internal storage cavity of the weight ; Indicates the width of the measuring tape ; Indicates installation clearance ; Indicates the length influence coefficient ; Indicates the length of the measuring tape ; Indicates inner diameter machining error .

[0052] Sensor: It consists of three parts: outer shell, contact rod and detection head. One end of the contact rod is connected to the measuring tape, and the other end is fixedly connected to the detection head. The detection head adopts a conical structure with inductive contacts on the surface. The outer shell adopts a waterproof and sealed design.

[0053] 2. Structure and function of decomposition well assembly: Well pipe: cylindrical pipe made of plastic, inner diameter The default range is 100~150 mm. There are threaded connection structures at both ends of the pipe body, and multiple water holes are opened on the pipe wall. The spatial distribution of the water holes is determined by Determine, among which The number of water holes per layer, the default range is indivual, The distance between the first layer water hole and the end of the well pipe. The default range is , is the spacing between water holes in adjacent layers, the default range is .

[0054] 3. The structure and function of the instrument table components: Support frame: Made of stainless steel, it consists of three parts: base, column and beam. The base is fixed to the installation platform, the column is vertically fixed to the base, and the beam is horizontally fixed to the top of the column.

[0055] The pulley block comprises a first pulley and a second pulley, which are respectively rotatably arranged at two ends of the beam. The outer peripheral surface of the pulley body is provided with a groove for limiting the measuring tape.

[0056] Reading pointer: vertically fixed in the middle of the beam, used to indicate the measurement results.

[0057] 4. Component connection and action mechanism: The inductive contact tape assembly is set on the pulley block, and the tape is driven by a heavy hammer to measure the water level change. Calculate measurement accuracy ,in is the contact sensing force, is the tape tension, is the tape curvature radius, is the bearing damping coefficient, is the fitting coefficient, is the precision error term.

[0058] The decomposition well assembly is connected to the support frame through a fixing seat and a bayonet assembly. Calculate the water level difference inside and outside the well ,in is the flow rate of the water inlet, For the The water inlet area, is the cross-sectional area of ​​the wellbore, is the water inlet diameter, is the wellbore diameter, is the number of water inlet holes, is the fitting coefficient, is the water level difference error term.

[0059] In the present invention, the meanings of the symbols used in the formulas are shown in Table 1: Table 1 Formula symbols and their meanings

[0060] The present invention provides a second embodiment of a contact-type well water gauge. In this embodiment, the contact-type water level meter is mainly composed of three parts: an inductive contact tape measure, a disassembly well, and an instrument table. The inductive contact tape measure is composed of a weight, a tape measure, and a floating sensor. In water level measurement, the inductive contact tape measure is an important component for detecting the presence of water level or liquid, measuring the water level as the water level moves up and down, and converting mechanical displacement into sound output. Each section of the well is a 1-meter round tube with an inner diameter of 100-150 mm. Screw buckles are set at both ends. It can be disassembled and assembled for use, and recycled and stored after comparison with the water gauge in the well. The instrument table is made of a stainless steel bracket, on which a pulley block and a reading pointer are set.

[0061] During operation, the inductive contact tape is placed on two pulleys, one end of the floating sensor is placed in the decomposition well, and one end of the tape weight is placed at the reading pointer. The length of the tape is adjusted according to the height of the liquid level (the weight is empty, and the extra meter roll is stored inside. There is a buckle, and the length of the meter can be selected). When the liquid level rises or falls, the inductive contact will move up and down accordingly. The contact detects the position change of the water level and converts the mechanical displacement into sound output, thereby realizing real-time monitoring of the liquid level. This method can monitor the rise and fall of the tide in real time and accurately (accurate to millimeters). The well is a round tube with a diameter of 100-150 mm, made of lightweight and strong materials (such as plastic pipes). Each section is about 1 meter long, with screw buckles at both ends. It is assembled and used according to the height of the water level and hung directly below the reading pointer. During observation, the observer looks at the reading pointer with both eyes according to the alarm sound and reads the value. After the comparison with the water scale in the well is completed, the inductive contact tape and the well are recovered and stored.

[0062] The requirements for the installation point are lower than those for the traditional well water gauge, with low requirements for wave influence, no observation angle requirements, and no influence from typhoons and ships. It does not need to be installed in the hidden places of offshore buildings such as breakwaters, docks, and piers. It only needs to be unobstructed with the open sea, avoid areas that are prone to deformation and siltation due to erosion, and the water depth at the lowest tide should be more than 1 meter.

[0063] The installation of traditional wellbore should be 1 meter higher than the sum of the local highest tide level and the maximum wave height. The depth of the well bottom should be 1.5-2 meters lower than the lowest tide level. There should be a water inlet hole in the well, and its height is about 1 meter below the possible lowest tide level. The size of the water inlet hole should ensure that the difference in tide level inside and outside the well is no more than 1 cm. A funnel-shaped wave absorber is installed at the water inlet end, which is very expensive.

[0064] As for the decomposition well, it only needs to have a plurality of water holes as long as the lower end is not above the water level. The upper end of the well can be connected to the platform bracket with screws so that the operation can be observed.

[0065] Tide well instrument platform: Fix the instrument platform and use expansion screws to fix the instrument platform on the upper part of the installation point to ensure that the platform is level and stable. Set a rectangular stainless steel bracket on the instrument platform, install the pulley block according to the installation requirements of the water gauge, and set the reading pointer through elevation measurement. The entire instrument platform is installed in a stainless steel distribution box.

[0066] After the installation is completed, debugging is carried out to check whether the contact-type external well water gauge is accurate and calibrate it with the water gauge inside the well to ensure that the reading of the water gauge is consistent with the actual water level.

[0067] How to use the contact-type external well water gauge: Assemble the disassembled well together and place it in the fixed clamp under the workbench. Then place the induction contact water gauge on the pulley block, put one end into the well, and read the value.

[0068] The present invention provides a third embodiment of a contact-type well external water gauge. In this embodiment, a specific use scenario of the present invention is provided: A groundwater research team decided to deploy the contact-type well water gauge of the present invention in a certain area to conduct long-term monitoring and analysis of the local groundwater level. The geological conditions in this area are complex and the groundwater resources are intensively exploited, so a simple and reliable water level measurement device is needed. After on-site investigation and program evaluation, the research team formulated the following specific implementation plan: 1. Design and production of the inductive contact tape measure assembly: First, the key size parameters of the measuring tape were determined. After repeated measurements and calculations, the width of the measuring tape was for .according to , combined with installation clearance , length influence coefficient And processing error , determine the diameter of the hammer cavity for , measure the length of the tape for .

[0069] The tape measure is made of high-quality stainless steel, and the weight is made of cast carbon steel with a hollow interior to form a storage cavity. for In order to ensure the stability of the tape measurement, a buckle structure is designed on the top of the weight, which can firmly fix the measuring tape through the cooperation of the elastic claw and the clamping block.

[0070] The design of the sensor is also key. Since the device needs to work in a harsh well environment for a long time, the outer shell is made of stainless steel, and a sealed cavity is set inside to protect the internal electronic components. One end of the contact rod is connected to the measuring tape, and the other end is fixedly connected to the conical detection head. The surface of the detection head is coated with an anti-corrosion coating to enhance durability. According to actual test results, the contact sensing force Control about.

[0071] 2. Design and production of decomposition well components: In view of local geological conditions, the research team decided to use plastic decomposition well pipes. After on-site survey, the wellbore diameter was determined. is 130 mm. After repeated optimization, the number of water holes in each layer is determined. for The distance between the first-layer water hole and the end of the well pipe for , the spacing between water holes in adjacent layers for . Water hole diameter Designed for .

[0072] To ensure the reliability of the connection, threaded structures are used at both ends of the well pipe. for , each water hole area Approx. .

[0073] 3. Design and production of instrument table components: The support frame of the instrument table components is made of high-quality stainless steel, including the base, column and beam. The size of the base is Fixed on the concrete installation platform; the column height is , connected vertically to the base; the length of the beam is , horizontally connected to the top of the column.

[0074] The pulleys are set at both ends of the beam. The outer periphery of the pulley body is provided with Wide limit groove, used with measuring tape. Both ends of the pulley shaft are connected to the support frame through ball bearings to ensure smooth rotation. Bearing damping coefficient Tested for .

[0075] The reading pointer is fixed in the middle of the beam, and its length is , perpendicular to the moving track of the measuring tape. For the convenience of observation, the entire instrument platform assembly is placed in a stainless steel distribution box, and an observation window is provided on the box door to align the reading pointer.

[0076] 4. Installation and commissioning of the device: After determining the specific parameters of each component, the research team organized construction personnel to install the device. First, a concrete was poured next to the selected well. The concrete foundation is used to install the support frame. After the foundation maintenance is completed, the support frame base is fixed here.

[0077] Next, assemble and disassemble the well pipe. , inserted into the ground section by section through threaded connection until the top of the pipe is flush with the ground. To ensure the verticality of the well pipe, a support bracket is set at the interface of each section of the pipe. Calculate when , , , , the expected water level difference inside and outside the well Approx. .

[0078] Finally, install the inductive contact tape assembly on the support frame. First, hoist the weight above the pulley block and fix the measuring tape in place with the snap-on structure. Then, install the sensor housing under the beam so that the detection head is aligned with the lower end of the weight. Stable , tape tension Maintain ,satisfy The accuracy requirements in .

[0079] After the entire device was installed, the research team invited relevant experts to conduct performance tests. By comparing the manual observation data, it was found that the device can stably and accurately measure the groundwater level, with a measurement accuracy better than Millimeters, fully meeting the monitoring requirements. After a six-month trial run, the device ran smoothly and collected data reliably, becoming an important part of local groundwater monitoring.

[0080] 5. Analysis of actual operation status: Since the device was put into operation, the research team has continuously tracked its performance. Based on actual monitoring data, combined with local meteorological and water use conditions, the following analysis results were obtained: (1) Water level change law: Table 2 Changes in groundwater level in a certain area time Water level (m) Change(mm) January 1, 2024 12.38 - February 1, 2024 12.41 +30 March 1, 2024 12.43 +20 April 1, 2024 12.39 -40 May 1, 2024 12.36 -30 June 1, 2024 12.33 -30 July 1, 2024 12.29 -40 August 1, 2024 12.25 -40 September 1, 2024 12.22 -30 October 1, 2024 12.27 +50 November 1, 2024 12.32 +50 December 1, 2024 12.35 +30 As can be seen from Table 2, the groundwater level in this area shows obvious seasonal changes. The water level is higher in winter and spring (January to April) and lower in summer and autumn (May to October), which is basically consistent with the local precipitation and water use. The water level generally changes within The maximum change can reach This provides effective data support for groundwater regulation.

[0081] (2) Factors affecting water level changes: To further analyze the factors affecting groundwater level changes, the research team collected local meteorological, water usage and other related data, and conducted a comparative study based on the monitoring results of this device.

[0082] Table 3 Relationship between groundwater level change and other factors time Water level (m) Change(mm) January 1, 2024 12.38 - February 1, 2024 12.41 +30 March 1, 2024 12.43 +20 April 1, 2024 12.39 -40 May 1, 2024 12.36 -30 June 1, 2024 12.33 -30 July 1, 2024 12.29 -40 August 1, 2024 12.25 -40 September 1, 2024 12.22 -30 October 1, 2024 12.27 +50 November 1, 2024 12.32 +50 December 1, 2024 12.35 +30 It can be found from Table 3 that there is a certain correlation between the change of groundwater level and local rainfall and water consumption. Generally speaking, an increase in rainfall will lead to an increase in groundwater level, while an increase in water consumption will cause the groundwater level to drop. However, this relationship is not absolute and is also affected by other factors such as geological conditions and mining intensity.

[0083] Through further analysis, the research team found that: ; in, , , This equation describes the variation of the water level difference between the inside and outside of the local well well, and provides an effective basis for the precise regulation of groundwater resources.

[0084] 6. Device maintenance: Since it was put into operation, the device has been running smoothly without any failure. The research team has arranged special personnel to conduct regular inspections, and the main tasks include: (1) Clean the induction contacts to ensure good contact performance. Clean once a quarter according to actual conditions; (2) Check the movement of the weight and measuring tape to ensure they are flexible and smooth. Lubricate and maintain once every six months; (3) Check the connection of each component to ensure that bolts and other fasteners are firm and reliable. Perform a tightness check once a month; (4) Check the accuracy of the reading pointer to ensure the reliability of the measurement results. Calibration should be performed once a year.

[0085] Regular maintenance ensures that the device can operate stably and efficiently over a long period of time. During the six-month trial run, the measurement accuracy has been maintained at It can fully meet the needs of groundwater level monitoring.

[0086] The core of the contact-type well water gauge of the present invention lies in the ingenious mechanical design and parameter optimization. Firstly, by accurately matching the inner cavity size of the weight and the length of the measuring tape, it is ensured that the measuring tape can be stably stored inside the weight to avoid affecting the measurement accuracy due to relaxation. , adjust the tape width , Installation clearance , length influence coefficient And processing error Considering various factors, the diameter of the inner cavity of the heavy hammer should be reasonably determined. Among them, the length influence coefficient It reflects the effect of the length of the tape measure on its tightness. The square root relationship is used because the tightness decreases as the length of the tape measure increases.

[0087] Secondly, the distribution of water holes in the well pipe is optimized. , reasonably determine the spatial position of each water hole. Among them, the circumferential arrangement adopts equal angle distribution, and the axial arrangement adopts equal spacing distribution, which can not only evenly absorb well water, but also facilitate the stable descent of the heavy hammer in the water. At the same time, by introducing the position error term ,The deviations during processing and installation are taken into account, further improving the reliability of the design.

[0088] Finally, in order to improve the measurement accuracy, the present invention fully considers the contact induction force , tape measure tension and bearing damping According to the key factors , the induction force term, tension term and damping term are reasonably weighed, and the fitting coefficient Optimization, and finally achieve The measurement accuracy is within millimeters. Among them, the induction force term reflects the sensing capacity per unit mass, the tension term reflects the influence of the bending degree of the tape measure, and the damping term represents the dynamic response characteristics.

[0089] At the same time, the present invention also conducts modeling analysis on the water level difference inside and outside the well. , taking into account the dynamic pressure term, area ratio term and aperture effect, the fitting coefficient The solution can accurately calculate the water level difference inside and outside the well. This provides effective data support for subsequent groundwater level analysis.

Claims

1. A contact type well water gauge, characterized in that: include: An inductive contact tape measure assembly, a decomposition well assembly and an instrument platform assembly; the inductive contact tape measure assembly includes a weight, a measuring tape and a sensor, the weight is hollow inside and is provided with a storage cavity for accommodating the measuring tape, the upper end of the weight is provided with a snap structure for fixing the measuring tape, one end of the measuring tape is fixedly connected to the weight, and the other end is fixedly connected to the sensor; the decomposition well assembly includes a plurality of well pipes, the well pipes are cylindrical pipe bodies with an inner diameter of 100 to 150 mm, threaded connection structures are provided at both ends of the well pipes, and a plurality of water holes are opened on the side walls of the well pipes; the instrument platform assembly includes a support frame, a pulley block and a reading pointer, the support frame is made of stainless steel, the pulley block is provided at the upper end of the support frame, the reading pointer is fixed on the support frame and is located directly below the pulley block, the inductive contact tape measure assembly is erected on the pulley block, and the decomposition well assembly is connected to the support frame via a fixed structure.

2. A contact type well water gauge according to claim 1, characterized in that: The support frame includes a base, a column and a beam, the base is fixed on the mounting platform, the column is vertically fixed on the base, the beam is horizontally fixed to the top of the column, the pulley group includes a first pulley and a second pulley, the first pulley and the second pulley are respectively rotatably arranged at both ends of the beam, and the reading pointer is vertically fixed in the middle of the beam.

3. A contact type well external water gauge according to claim 2, characterized in that: The heavy hammer includes a hammer body, a hammer cover and a fixing sleeve. The hammer body is cylindrical and hollow inside to form the storage cavity. The hammer cover is connected to the top of the hammer body through a threaded structure. The fixing sleeve is fixed to the upper end of the hammer cover. The fixing sleeve is provided with the buckle structure, which includes an elastic claw and a clamping block. The measuring tape is fixed by the elastic claw after passing through the fixing sleeve.

4. A contact-type external well water gauge according to claim 3, characterized in that: The sensor includes an outer shell, a contact rod and a detection head. A sealed cavity is arranged inside the outer shell. The contact rod is inserted into the sealed cavity and one end is fixedly connected to the detection head. The other end of the contact rod is fixedly connected to a measuring tape. A waterproof sealing ring is arranged on the outer surface of the outer shell.

5. A contact-type external well water gauge according to claim 4, characterized in that: The well pipe includes a pipe body, a first connecting end and a second connecting end. The pipe body is made of plastic. The first connecting end is provided with an external thread, and the second connecting end is provided with an internal thread. The water holes are evenly distributed along the circumference of the pipe body and arranged in a plum blossom shape.

6. A contact type external well water gauge according to claim 5, characterized in that: The support frame is arranged in a stainless steel distribution box, which includes a box body and a box door. The box body is fixed on a mounting platform, the box door is hinged to the box body through a hinge structure, and an observation window is arranged on the box door, which corresponds to a reading pointer.

7. A contact type well external water gauge according to claim 6, characterized in that: The fixing structure includes a fixing seat and a bayonet assembly, the fixing seat is fixed to the bottom of the support frame, the bayonet assembly includes a first clamping plate and a second clamping plate, the first clamping plate and the second clamping plate are arranged opposite to each other and fixed by bolts, and the top of the decomposition well assembly passes through the bayonet assembly and is fixed.

8. A contact-type external well water gauge according to claim 7, characterized in that: The pulley block comprises a pulley body, a pulley shaft and a bearing. The outer peripheral surface of the pulley body is provided with a groove for limiting the measuring tape. Both ends of the pulley shaft are connected to the support frame through bearings, and the pulley body is fixed to the pulley shaft through a key connection.

9. A contact-type external well water gauge according to claim 8, characterized in that: The detection head comprises a probe body and a sensing contact, wherein the probe body is in a conical structure, the sensing contact is arranged on the surface of the probe body and is electrically connected to the contact rod, and the outer surface of the probe body is provided with an anti-corrosion coating.

10. A contact-type external well water gauge according to claim 9, characterized in that: The mutual relationship between the sizes of the weight and the measuring tape and the mutual relationship between the distribution positions of the water holes in the well pipe are defined by the limiting equation of the matching relationship between the weight and the measuring tape and the limiting equation of the distribution positions of the water holes in the well pipe.

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