A groundwater level monitoring system and measurement method

Abstract

This invention belongs to the field of groundwater monitoring equipment, specifically relating to a groundwater level monitoring system and measurement method. It includes a water level sensing device and a cable-laying mechanism. The water level sensing device is lowered into a groundwater monitoring well using the cable-laying mechanism. The cable-laying mechanism includes a frame, a motor mounted on the frame, and a spool driven by the motor to rotate. A measuring mechanism is mounted on the spool. The water level sensing device includes a tension sensor and a float. The lower end of the float has an inverted, cup-shaped water-drawing chamber. The float is suspended from the lower side of the frame by the tension sensor. This invention uses a motor-driven release or reel-in method to lower the groundwater level monitoring system into the monitoring well, and adjusts the motor's forward and reverse rotation based on data from the water level sensing device, making water level monitoring more timely and accurate, and improving detection efficiency.

Description

Technical Field

[0001] The invention belongs to the field of groundwater monitoring equipment, and in particular relates to a groundwater level monitoring system and a measuring method. Background Art

[0002] The current practice of groundwater level monitoring is usually to drill wells at selected monitoring points. When the groundwater level needs to be measured, it is measured using a wheel-laying detection device, that is, a water level sensor connected to the end of a suspension cable is manually placed into the monitoring well. When the water level sensor enters the water, a signal is sent back to the indicator through the suspension cable. The indicator prompts the operator through sound and light alarms that the water level sensor has entered the water. The operator then obtains the current groundwater level information based on the length of the released suspension cable.

[0003] This method is operated manually, and because the water level sensor sends a signal as soon as it enters the water, if the cable is released too quickly, the water level sensor may have already penetrated to a certain depth in the water body, resulting in inaccurate measurement. Therefore, the specification requires repeated measurements three times and the average value is taken, which results in a longer single measurement time. When groundwater level monitoring requires continuous measurement, the operator is required to operate frequently, which is labor-intensive and inefficient. Summary of the invention

[0004] In order to solve the above problems in the prior art, the present invention provides a groundwater level monitoring system and a measuring method, which have a simple structure and low cost, can realize automatic water level monitoring and improve measurement efficiency.

[0005] The specific technical solution adopted by the present invention is:

[0006] A groundwater level monitoring system includes a water level sensor and a wire-releasing mechanism. The water level sensor is placed in a groundwater monitoring well with the help of the wire-releasing mechanism. The wire-releasing mechanism includes a frame, a motor arranged on the frame, and a wire shaft driven to rotate by the motor. A metering mechanism is arranged on the wire shaft. The water level sensor includes a tension sensor and a floating chamber. An inverted cup-shaped water-drawing cavity is arranged at the lower end of the floating chamber. The floating chamber is suspended on the lower side of the frame with the help of the tension sensor.

[0007] The metering mechanism comprises a rotating wheel disc and a Hall sensor arranged on one side of the rotating wheel disc, and a magnetic sheet cooperating with the induction end of the Hall sensor is arranged on the side wall of the rotating wheel disc.

[0008] The suspension rope led out from the spool is wound around the rotating wheel for one circle and then led to the wellhead of the groundwater monitoring well and fixed at the wellhead.

[0009] A storage battery is arranged on the frame.

[0010] The floating bin further includes a sealed floating cavity, the drainage weight of the floating cavity is greater than the weight of the floating bin, the bottom of the water suction cavity is an open end, through holes penetrating the side wall of the floating bin are arranged on the side wall of the water suction cavity, and a rubber sheet is hinged outside the through holes. With the arrangement of the rubber sheet, the water suction cavity forms a one-way conduction structure from inside to outside.

[0011] The measurement method includes the following steps:

[0012] S1. Fix the suspension rope led out from the spool at the wellhead, and put the water level sensing device and the wire releasing mechanism into the well.

[0013] S2. The wire releasing mechanism lowers the water level sensing device to the bottom of the well under the rotation of the motor.

[0014] S3. After the water level sensing device first touches the water, perform a water touch confirmation procedure.

[0015] S4. After the water touch confirmation procedure is completed, the motor adjusts the length of the suspension rope by rotation to make the reading of the tension sensor reach the preset value, and obtains the current groundwater level data through the data transmitted back by the metering mechanism to complete the monitoring.

[0016] Among them, the water touch confirmation procedure in step S3 includes the following steps:

[0017] S31. During the uniform lowering of the suspension rope, when the reading of the tension sensor changes from zero tension to pressure and the pressure remains unchanged, it is considered that the water level sensing device and the wire releasing mechanism have been completely immersed in water at this time, and the motor rotation is stopped.

[0018] S32. Subsequently, the motor rotates in the reverse direction to lift the water level sensing device and the wire releasing mechanism again.

[0019] S33. After the reading of the tension sensor changes back to tension, continue to lift. When the water suction cavity in the shape of an inverted cup is separated from the water surface, the water inside the water suction cavity is emptied due to the bottom being separated from the water surface, causing the reading of the tension sensor to suddenly change from f1 to f2, and f1 - f2 = M汲, where M汲 is the drainage weight of the water suction cavity and f2 is the preset weight of the floating bin. At this time, it is considered that the water level sensing device has successfully touched the water. Otherwise, it has not touched the water, and personnel need to assist in removing the debris in the well that affects water touch.

[0020] Among them, the preset value of the tension sensor in step S4 is 0. At this time, the effective number of turns supplied by the rotating wheel disc of the metering mechanism is n, and the diameter of the suspension rope coil wound around the rotating wheel disc is r. At this time, the groundwater depth h = 2πr * n + l预, where l预 is the distance from the rotating shaft of the rotating wheel disc of the metering mechanism to the water surface when the preset reading of the tension sensor is 0.

[0021] The beneficial effects of the present invention are:

[0022] The present invention places the underground water level monitoring system into the monitoring well by releasing or reeling in the suspension rope through the rotation of a motor, and adjusts the forward and reverse rotation of the motor through data from a water level sensor device, thereby making water level monitoring more timely and accurate and improving detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the present invention;

[0024] In the attached drawings, 1, frame, 2, motor, 3, bobbin, 4, tension sensor, 5, floating chamber, 6, water-drawing chamber, 7, rotating wheel, 8, Hall sensor, 9, suspension rope, 10, battery, 11, floating chamber, 12, rubber sheet. DETAILED DESCRIPTION

[0025] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments:

[0026] Specific implementation examples Figure 1 As shown, the present invention is a groundwater level monitoring system, including a water level sensor device and a wire-releasing mechanism. The water level sensor device is placed in a groundwater monitoring well with the help of the wire-releasing mechanism. The wire-releasing mechanism includes a frame 1, a motor 2 arranged on the frame 1, and a reel 3 driven to rotate by the motor 2. A metering mechanism is arranged on the reel 3. The water level sensor device includes a tension sensor 4 and a floating bin 5. The lower end of the floating bin 5 is provided with an inverted cup-shaped water-drawing cavity 6. The floating bin 5 is suspended on the lower side of the frame 1 with the help of the tension sensor 4.

[0027] When the present invention is in use, a suspension rope is fixed at the wellhead and a water level monitoring system is placed in the well. When the controller powers on the motor and starts to release the line, the controller simultaneously starts to read the data sent back by the tension sensor to know whether the floating chamber is submerged in water and to determine the timing of reading the water level information.

[0028] Further, such as Figure 1 As shown, the metering mechanism includes a rotating wheel disc 7 and a Hall sensor 8 arranged on one side of the rotating wheel disc 7 , and a magnetic sheet cooperating with the sensing end of the Hall sensor 8 is arranged on the side wall of the rotating wheel disc 7 .

[0029] When the rope is released or reeled in, the rotating wheel is entangled by the rope, causing the rotating wheel to rotate with the movement of the rope, so that the Hall sensor can obtain the number of times the magnetic sheet passes, thereby obtaining the number of rotations. When the controller makes a judgment, when the groundwater level monitoring system is lowered, if the motor is rotating forward, the number of turns information obtained by the Hall sensor when the motor is rotating forward is stored in the controller as a positive number and forms a turn record variable. When the motor is reversed, the corresponding number of turns is stored in the controller as a negative number. By adding and subtracting positive and negative turns, the current effective number of turns is obtained, which makes it easier to obtain the release length of the rope and then obtain the groundwater level information.

[0030] Furthermore, the suspension rope 9 led out from the spool 3 is wound around the rotating wheel 7 once and then led to the wellhead of the groundwater monitoring well and fixed at the wellhead.

[0031] Furthermore, a battery 10 is arranged on the frame 1. The battery, the frame, and the motor form a counterweight for pressing the floating chamber into the water.

[0032] Furthermore, the floating chamber 5 also includes a sealed floating chamber 11, the drainage weight of the floating chamber 11 is greater than the weight of the floating chamber 5, the bottom of the water-drawing chamber 6 is an open end, and the side wall of the water-drawing chamber 6 is provided with a through hole that penetrates the side wall of the floating chamber 5, and the outer side of the through hole is hinged with a rubber sheet 12. With the help of the setting of the rubber sheet 12, the water-drawing chamber 6 forms a unidirectional conductive structure from the inside to the outside.

[0033] With the help of the one-way conduction structure, when the water-drawing chamber contacts the water surface, the air enclosed in the water-drawing chamber pushes the rubber sheet out from the through hole, so that the water-drawing chamber is filled with water. When the water-drawing chamber is lifted up with the floating chamber, due to the existence of the one-way conduction structure, the bottom opening of the water-drawing chamber is always filled with water before it is pulled out of the water surface, thereby changing the weight of the floating chamber and providing parameter support for the water contact confirmation of the tension sensor and controller. This solves the problem of being unable to determine whether the groundwater level is actually in contact with the water surface due to the narrowness and depth of the well when measuring the groundwater level.

[0034] The present invention also discloses a method for measuring a groundwater level monitoring system, comprising the following steps:

[0035] S1. Fix the lifting rope 9 drawn from the spool 3 at the wellhead, and put the water level sensor and the line-releasing mechanism into the well;

[0036] S2. The wire-releasing mechanism rotates the motor 2 to lower the water level sensor device into the well;

[0037] S3. When the water level sensor device first touches water, a water touch confirmation procedure is performed;

[0038] S4. After the water contact confirmation procedure is completed, the motor 2 adjusts the length of the suspension rope 9 by rotating so that the reading of the tension sensor 4 reaches the preset value, and the current groundwater level data is obtained through the data sent back by the metering mechanism to complete the monitoring.

[0039] The water contact confirmation procedure in step S3 includes the following steps:

[0040] S31. During the uniform lowering of the rope 9, the reading of the tension sensor 4 changes from zero tension to pressure, and after the pressure remains unchanged, it is considered that the water level sensor device and the release mechanism are completely immersed in water, and the motor 2 is stopped;

[0041] Subsequently, the motor 2 rotates in the reverse direction to lift the water level sensing device and the wire releasing mechanism again;

[0042] After the reading of the tension sensor 4 changes back to tension, continue to lift until the water suction chamber 6 in the shape of an inverted cup is separated from the water surface. Since the bottom of the water suction chamber 6 is separated from the water surface, the water inside is emptied, causing the reading of the tension sensor 4 to suddenly change from f1 to f2, and f1 - f2 = M汲, where M汲 is the drained weight of the water suction chamber 6, and f2 is the preset weight of the floating bin 5. At this time, it is considered that the water level sensing device has successfully touched the water. Otherwise, it has not touched the water, and personnel need to assist in removing the debris in the well that affects water contact.

[0043] Among them, the preset value of the tension sensor 4 in step S4 is 0. At this time, the effective number of turns supplied by the rotating wheel 7 of the metering mechanism is n, and the coil diameter of the lifting rope 9 wound around the rotating wheel 7 is r. At this time, the groundwater depth h = 2πr * n + l预, where l预 is the distance from the rotation axis of the rotating wheel 7 of the metering mechanism to the water surface when the reading of the tension sensor 4 is preset to 0.

Claims

1. A groundwater level monitoring system, comprising a water level sensor and a wire-laying mechanism, wherein the water level sensor is placed in a groundwater monitoring well by means of the wire-laying mechanism, and is characterized in that: The described wire pay-off mechanism includes a frame (1), a motor (2) arranged on the frame (1), and a spool (3) driven to rotate by the motor (2). A metering mechanism is arranged on the spool (3). The water level sensing device includes a tension sensor (4) and a floating bin (5). The lower end of the floating bin (5) is provided with a water suction cavity (6) inverted in a cup shape. The floating bin (5) is suspended under the frame (1) by means of the tension sensor (4); The floating bin (5) further includes a sealed floating cavity (11). The drainage weight of the floating cavity (11) is greater than the weight of the floating bin (5). The bottom of the water suction cavity (6) is an open end. Through holes penetrating the side wall of the floating bin (5) are arranged on the side wall of the water suction cavity (6). A rubber sheet (12) is hinged outside the through holes. The rubber sheet (12) is used to make the water suction cavity (6) form a one-way conduction structure from the inside to the outside; The measurement method using the underground water level monitoring system includes the following steps: S1. Fix the lifting rope (9) led out from the spool (3) at the wellhead, and put the water level sensing device and the wire pay-off mechanism into the well; S2. The wire pay-off mechanism lowers the water level sensing device into the well under the rotation of the motor (2); S3. After the water level sensing device first touches the water, a water-touch confirmation procedure is carried out; S4. After the water-touch confirmation procedure is completed, the motor (2) adjusts the length of the lifting rope (9) by rotation to make the reading of the tension sensor (4) reach a preset value, and obtains the current underground water level data through the data transmitted back by the metering mechanism to complete the monitoring; Among them, the water-touch confirmation procedure in step S3 includes the following steps: S31. During the uniform lowering process of the lifting rope (9), when the reading of the tension sensor (4) changes from zero tension to pressure and the pressure remains unchanged, it is considered that the water level sensing device and the wire pay-off mechanism are completely immersed in water at this time, and the rotation of the motor (2) is stopped; S32. Subsequently, the motor (2) rotates in the reverse direction to lift the water level sensing device and the wire pay-off mechanism again; S33. After the reading of the tension sensor (4) changes back to tension again, continue to lift. When the water suction cavity (6) inverted in a cup shape is separated from the water surface, the water suction cavity (6) drains the water inside due to the bottom being separated from the water surface, so that the reading of the tension sensor (4) suddenly changes from f1 to f2, and f1 - f2 = M汲, where M汲 is the drainage weight of the water suction cavity (6), and f2 is the preset weight of the floating bin (5). At this time, it is considered that the water level sensing device touches the water successfully. Otherwise, it does not touch the water, and personnel need to assist in removing the sundries in the well that affect water touch.

2. The groundwater level monitoring system according to claim 1, characterized in that: The described metering mechanism includes a rotating wheel disc (7) and a Hall sensor (8) arranged on one side of the rotating wheel disc (7). Magnetic pieces cooperating with the sensing end of the Hall sensor (8) are arranged on the side wall of the rotating wheel disc (7).

3. The underground water level monitoring system according to claim 2, characterized in that: The lifting rope (9) led out from the spool (3) is wound around the rotating wheel disc (7) once and then led to the wellhead of the underground water monitoring well and fixed at the wellhead.

4. The underground water level monitoring system according to claim 1, characterized in that: A storage battery (10) is arranged on the frame (1).

5. The underground water level monitoring system according to claim 1, characterized in that: Among them, In step S4, the preset value of the tension sensor (4) is 0. At this time, the rotating wheel (7) of the metering mechanism has rotated an effective number of turns n, and the coil diameter of the suspension rope (9) wound around the rotating wheel (7) is r. At this time, the groundwater depth h=2πr*n+lpre, where lpre is the distance between the rotating axis of the rotating wheel (7) of the metering mechanism and the water surface when the preset tension sensor (4) reading is 0.

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