Underground water fixed-depth sampling device

Abstract

The utility model relates to the technical field of water quality detection, in particular to an underground water fixed-depth sampling device which is internally provided with a sampling assembly, a magnetic switch assembly and a magnetic control assembly, the magnetic switch assembly is installed at the collecting end of the sampling assembly, and the magnetic control assembly is electrically connected with the magnetic switch assembly; the sampling assembly is used for collecting an underground water sample, the magnetic switch assembly is used for opening or closing the collecting end of the sampling assembly through the magnetic change of the magnetic switch assembly, and the magnetic control assembly is used for controlling the magnetic change of the magnetic switch assembly so as to keep the closed state of the collecting end of the collecting assembly before the collecting assembly reaches a specified depth; thus, closing and opening of the collecting end of the collecting assembly are controlled through the magnetic switch assembly, so that underground water at other depths is prevented from entering the collecting assembly, only underground water at a specified depth enters the collecting assembly, external heavy auxiliary equipment is not needed, and the device is convenient to move during multi-position sampling, so that the transportation cost and the labor cost are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of groundwater collection, in particular to a groundwater fixed-depth sampling device. Background Art

[0002] Groundwater quality monitoring is the work of monitoring and measuring the types and concentrations of harmful substances in groundwater, and understanding the groundwater quality status and pollution trends. Its purpose is to achieve the following goals by monitoring different water quality indicators, such as ammonia nitrogen, nitrite nitrogen, nitrate nitrogen, total hardness, pH value, oxygen demand, total mineralization, potassium, sodium, calcium, magnesium, bicarbonate, sulfate, chloride ion, phenol, cyanide, mercury, arsenic, cadmium, total chromium, fluoride, oil, coliform group and total bacteria count, etc.: 1. Serving as an early warning system for water supply and source protection, 1. Promptly detect water quality problems and prevent polluted water sources from being used for human consumption; 2. Monitor the rising trend of pollutant concentrations, predict water quality change trends, and provide a basis for preventive measures; 3. Evaluate the effectiveness of pollution control measures by comparing monitoring data; 4. Verify pollution risk assessment results to ensure the accuracy of the assessment; 5. Correct the numerical model of pollutant migration to improve the accuracy of predictions; 6. Trace groundwater flow to understand the water flow path and speed; 7. Diagnose changes in the groundwater environment and identify potential environmental problems.

[0003] At present, groundwater samples are mainly collected by placing a Bailer tube, a water pump or a gas displacement sampler into a pre-dug sampling well. The Bailer tube can only collect mixed samples; and the general sampling water pump is limited by the sampling depth and can only collect shallow water samples no deeper than 10 meters. The water pump is also difficult to clean and has the disadvantage that different samples easily interfere with each other. In the traditional gas displacement sampler, during the sampling process, high-pressure gas can easily enter the water outlet pipe through the water outlet check valve, causing gas overflow. The inflow and outflow of gas will also cause great disturbance to the water sample, and the operation is inconvenient.

[0004] In order to solve the above technical problems, the technical solution of the Chinese utility model patent announcement with patent application number CN201820817695.6 is a pressure differential groundwater fixed depth collection device, which is characterized in that: the device includes a sampler and an air source connected to the sampler through an air pipe; the sampler includes a sampling tube, and the two ends of the sampling tube are respectively provided with an upper plug and a lower plug and a funnel-shaped guide cover is provided in the sampling tube; the upper plug is provided with a vent pipe, one end of the vent pipe is connected to the air pipe and the other end is connected to the small hole of the guide cover, and a float is also provided in the guide cover; the lower plug is provided with an inlet pipe and an outlet pipe, and the inlet pipe is provided with a one-way valve, a filter and a water inlet from top to bottom, and the outlet pipe is provided with an outlet valve.

[0005] However, the above-mentioned prior art has the following technical problems: the above-mentioned pressure differential groundwater fixed-depth collection device uses external auxiliary equipment to generate air pressure in the sampling tube so that groundwater will not enter the sampling tube before the sampling tube reaches the specified depth, thereby realizing the groundwater sample collection operation at the specified depth. However, auxiliary equipment such as air pumps are heavy and inconvenient to carry, which makes the device difficult to move when sampling at multiple locations, resulting in increased transportation costs and labor costs. Utility Model Content

[0006] In view of this, it is necessary to provide a groundwater fixed-depth sampling device that can collect groundwater samples at a specified depth without the need for external heavy auxiliary equipment, so that the device can be moved when sampling at multiple locations, thereby reducing transportation costs and labor costs.

[0007] The utility model provides a groundwater fixed-depth sampling device, comprising a sampling component, a magnetic switch component and a magnetic control component, wherein the magnetic switch component is installed at the collection end of the sampling component, and the magnetic control component is electrically connected to the magnetic switch component; the sampling component is used to collect groundwater samples, the magnetic switch component is used to open or close the collection end of the sampling component by changing its own magnetism, and the magnetic control component is used to control the magnetism change of the magnetic switch component to keep the collection end of the collection component in a closed state before the collection component reaches a specified depth.

[0008] Preferably, the sampling assembly includes a sampling tube and a sampling cover, the bottom end of the sampling tube is provided with a water sampling hole for collecting groundwater samples, and the sampling cover is installed on the top end of the sampling tube.

[0009] Preferably, the magnetic switch assembly includes an electromagnet, a float and a first limiting cylinder. The electromagnet is fixedly installed in the interlayer between the water sampling hole and the outer wall of the sampling cylinder. The two sides of the electromagnet are electrically connected to the magnetic control assembly respectively to adjust the magnetism of the electromagnet through the magnetic control assembly. The first limiting cylinder is installed on the top of the water sampling hole. The float is slidably installed in the first limiting cylinder. A magnet is installed in the float to approach or move away from the top of the water sampling hole as the magnetism of the electromagnet changes, thereby opening or closing the water sampling hole.

[0010] Preferably, the magnetic control component includes two wires, a spool, a current controller and a first battery, one end of each wire is connected to one side of the electromagnet, and the other end is connected to the current controller after passing through the spool to store the wires through the spool, the current controller and the first battery are electrically connected, the current controller is used to control the direction of the current in the two wires, thereby adjusting the magnetism of the electromagnet, and the first battery is used to power the current controller and the electromagnet.

[0011] Preferably, each wire is marked with a depth scale line to obtain the depth of the sampling tube entering the sampling well.

[0012] Preferably, the sampling assembly further comprises a counterweight ring, which is fixedly mounted on the outside of the sampling barrel to enable the sampling barrel to sink into groundwater.

[0013] Preferably, the sampling assembly further comprises a plurality of connecting rods of the same structure, the bottom end of each connecting rod being used for fixed connection with the top end of the sampling cover or the top end of another connecting rod, so as to extend the sampling tube into the groundwater through the connecting rod.

[0014] Preferably, the groundwater fixed-depth sampling device also includes an alarm component, which includes an alarm assembly, a trigger assembly and a buoyancy assembly. The alarm assembly, trigger assembly and buoyancy assembly are installed in the sampling cover in sequence from top to bottom. The trigger assembly includes a first contact, an elastic membrane and a second contact. The elastic membrane is arranged below the first contact, and the second contact is arranged on the elastic membrane. The first contact and the second contact are electrically connected to the two ends of the alarm component respectively; the buoyancy assembly includes a limit piece and a buoyancy piece, and the limit piece is provided with a second limit cylinder. The buoyancy piece can be slidably installed in the second limit cylinder, and the first contact, the second contact and the second limit cylinder are coaxially arranged; the buoyancy piece rises or falls with the water level in the sampling cylinder, so that the second contact contacts or separates from the first contact. The alarm component is used to determine whether the second contact contacts the first contact, and to issue an alarm prompt when the second contact contacts the first contact.

[0015] Preferably, the alarm component includes a second battery and a buzzer, one end of the second battery is electrically connected to the buzzer and the first contact in sequence, and the other end is electrically connected to the second contact; the buzzer is used to determine whether the second contact is in contact with the first contact, and to issue an alarm prompt when the second contact is in contact with the first contact.

[0016] Preferably, the alarm component includes a second battery, a signal generator, a wearable ring, a third battery, a signal receiver and a vibration alarm, one end of the second battery is electrically connected to the signal generator and the first contact in sequence, and the other end is electrically connected to the second contact for powering the signal generator; the third battery, signal receiver and vibration alarm are all installed on the wearable ring, the third battery is electrically connected to the signal receiver and the vibration alarm respectively for powering the signal receiver and the vibration alarm, the signal receiver is electrically connected to the vibration alarm, and is communicatively connected to the signal generator; the signal generator is used to determine whether the first contact is in contact with the second contact, and sends a start signal to the signal receiver when the first contact is in contact with the second contact, the vibration alarm is used to determine whether the signal receiver receives the start signal, and sends an alarm prompt when the signal receiver receives the start signal.

[0017] The above-mentioned groundwater fixed-depth sampling device is provided with a sampling component, a magnetic switch component and a magnetic control component. The magnetic switch component is installed at the collecting end of the sampling component, and the magnetic control component is electrically connected to the magnetic switch component. The sampling component is used to collect groundwater samples. The magnetic switch component is used to open or close the collecting end of the sampling component by changing its own magnetism. The magnetic control component is used to control the magnetic change of the magnetic switch component to keep the collecting end of the collecting component in a closed state before the collecting component reaches the specified depth. In this way, the closing and opening of the collecting end of the collecting component is controlled by the magnetic switch component, so that when the collecting component enters or leaves the sampling well, the collecting end of the collecting component is closed, and when the collecting component reaches the specified depth, the collecting end of the collecting component is opened, thereby preventing groundwater from other depths from entering the collecting component. Only groundwater from the specified depth enters the collecting component to realize groundwater sample collection at the specified depth. The utility model can realize groundwater sample collection operation at a specified depth without the need for external heavy auxiliary equipment, which is convenient for the device to move when sampling at multiple locations, thereby reducing transportation costs and labor costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is an oblique bird's-eye view of the groundwater fixed-depth sampling device of the present application.

[0019] Figure 2 This is an oblique top-down view of the sampling assembly of the present application.

[0020] Figure 3 It is a cross-sectional view of the bottom end of the sampling assembly of the present application.

[0021] Figure 4 It is an oblique bottom view of the magnetic control assembly of the present application.

[0022] Figure 5 This is an oblique bird's-eye view of Example 1 of the present application.

[0023] Figure 6 This is an oblique bird's-eye view of Example 2 of the present application.

[0024] Figure 7 It is an oblique bird's-eye view of the alarm component of the present application.

[0025] Figure 8 It is a cross-sectional view of the sampling cover of the present application.

[0026] Figure 9 It is an oblique top view of the elastic membrane of the present application.

[0027] Figure 10 This is an oblique bird's-eye view of the buoyancy assembly of the present application.

[0028] Figure 11 This is an oblique bird's-eye view of Example 4 of the present application.

[0029] In the figure: groundwater fixed depth sampling device 10, sampling assembly 20, sampling cylinder 21, sampling cover 22, water sampling hole 23, counterweight ring 24, connecting rod 25, electrical box 26, slot 27, magnetic switch assembly 30, electromagnet 31, float 32, first limiting cylinder 33, magnetic control assembly 40, wire 41, spool 42, current controller 43, first battery 44, alarm component 50, alarm assembly 51, second battery 511, buzzer 512, signal generator 513, wearing ring 514, third battery 515, signal receiver 516, vibration alarm 517, trigger assembly 52, first contact 521, elastic membrane 522, second contact 523, buoyancy assembly 53, limiting member 531, second limiting cylinder 532, buoyancy member 533. DETAILED DESCRIPTION

[0030] The technical solutions and technical effects of the embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings of the present invention.

[0031] Please refer to Figure 1 and Figure 3The present invention provides a groundwater fixed depth sampling device 10, comprising a sampling group 20, a magnetic switch assembly 30 and a magnetic control assembly 40. The magnetic switch assembly 30 is installed at the collection end of the sampling group 20, and the magnetic control assembly 40 is electrically connected to the magnetic switch assembly 30. The sampling group 20 is used to collect groundwater samples. The magnetic switch assembly 30 is used to open or close the collection end of the sampling group 20 by changing its own magnetism. The magnetic control assembly 40 is used to control the magnetic change of the magnetic switch assembly 30 so that the collection end of the collection assembly remains in a closed state before the collection assembly reaches a specified depth. The closing and opening of the collecting end of the collecting component is controlled by the magnetic switch component 30, so that when the collecting component enters or leaves the sampling well, the collecting end of the collecting component is closed, and when the collecting component reaches the specified depth, the collecting end of the collecting component is opened, thereby preventing groundwater from other depths from entering the collecting component. Only groundwater at the specified depth enters the collecting component, thereby realizing the collection of groundwater samples at the specified depth; the utility model can realize the groundwater sample collection operation at the specified depth without the need for external heavy auxiliary equipment, which is convenient for the device to be moved when sampling at multiple locations, thereby reducing transportation costs and labor costs.

[0032] Please refer to Figure 2 Furthermore, the sampling group 20 includes a sampling tube 21 and a sampling cover 22. The bottom end of the sampling tube 21 is provided with a water sampling hole 23 for collecting groundwater samples. The sampling cover 22 is installed at the top of the sampling tube 21 to close the top of the sampling tube 21 to prevent groundwater from entering the sampling tube 21 from the top of the sampling tube 21.

[0033] Please refer to Figure 3 Furthermore, the magnetic switch assembly 30 includes an electromagnet 31, a float 32, and a first limiting cylinder 33. The electromagnet 31 is fixedly installed in the interlayer between the water sampling hole 23 and the outer wall of the sampling cylinder 21. Both sides of the electromagnet 31 are electrically connected to the magnetic control assembly 40 to adjust the magnetism of the electromagnet 31 through the magnetic control assembly 40. The first limiting cylinder 33 is installed at the top of the water sampling hole 23. The float 32 is slidably installed in the first limiting cylinder 33. The float 32 is equipped with a magnet so that it approaches or moves away from the top of the water sampling hole 23 as the magnetism of the electromagnet 31 changes, thereby opening or closing the water sampling hole 23.

[0034] In one embodiment, the north pole and south pole of the magnet in the float 32 are respectively facing the bottom and the top of the float 32, so that when the top of the electromagnet 31 is the south pole, the float 32 is attracted, so that the float 32 is close to the top of the water sampling hole 23, thereby closing the water sampling hole 23; when the top of the electromagnet 31 is the north pole, the float 32 is repelled, so that the float 32 is away from the top of the water sampling hole 23, thereby opening the water sampling hole 23.

[0035] In one embodiment, the north pole and south pole of the magnet in the float 32 are respectively toward the top and bottom of the float 32, so that when the top of the electromagnet 31 is the north pole, the float 32 is attracted, so that the float 32 is close to the top of the water sampling hole 23, thereby closing the water sampling hole 23; when the top of the electromagnet 31 is the south pole, the float 32 is repelled, so that the float 32 is away from the top of the water sampling hole 23, thereby opening the water sampling hole 23.

[0036] Please refer to Figure 4 Furthermore, the magnetic control component 40 includes two wires 41, a spool 42, a current controller 43 and a first battery 44. One end of each wire 41 is connected to one side of the electromagnet 31, and the other end is connected to the current controller 43 after passing through the spool 42, so that the wires 41 can be stored through the spool 42. The current controller 43 and the first battery 44 are electrically connected. The current controller 43 is used to control the direction of the current in the two wires 41, thereby adjusting the magnetism of the electromagnet 31. The first battery 44 is used to power the current controller 43 and the electromagnet 31.

[0037] In this embodiment, a rotating rod is further provided on the side of the spool 42 to facilitate rotating the spool 42 to release or retract the wire 41 .

[0038] Furthermore, each wire 41 is marked with a depth scale line to obtain the depth of the sampling tube 21 entering the sampling well, thereby facilitating the operator to judge the depth of the sampling tube 21 entering the sampling well.

[0039] In this embodiment, a wire box 26 is provided on the top surface of the sampling cover 22 for fixing each wire 41; a plurality of card slots 27 are evenly provided on the side of the sampling tube 21 for fixing each wire 41, thereby facilitating the calculation of the depth of the sampling tube 21 entering the sampling well.

[0040] Please refer to Figure 5 , Example 1, Collection of groundwater samples at a specified depth

[0041] The sampling group 20 also includes a counterweight ring 24. By fixing the counterweight ring 24 on the outside of the sampling cylinder 21, the gravity of the sampling cylinder 21 is made greater than its own buoyancy, so that the sampling cylinder 21 can sink into the groundwater for groundwater sampling operations.

[0042] Please refer to Figure 6 , Example 2, Collection of groundwater samples at a specified depth

[0043] The sampling group 20 also includes several connecting rods 25 of the same structure. By fixedly connecting the bottom end of the connecting rod 25 to the top end of the sampling cover 22, the staff can press the sampling tube 21 into the water through the connecting rod 25; the bottom end of each connecting rod 25 can also be connected to the top end of another connecting rod 25, thereby increasing the depth of the sampling tube 21 entering the groundwater.

[0044] Please refer to Figures 7 to 9 Furthermore, the groundwater fixed depth sampling device 10 also includes an alarm component 50, which includes an alarm component 51, a trigger component 52 and a buoyancy component 53. The alarm component 51, the trigger component 52 and the buoyancy component 53 are sequentially installed in the sampling cover 22 from top to bottom. The trigger component 52 includes a first contact 521, an elastic membrane 522 and a second contact 523. The elastic membrane 522 is arranged below the first contact 521, and the second contact 523 is arranged on the elastic membrane 522 to reset the second contact 523. The first contact 521 and the second contact 523 are electrically connected to the two ends of the alarm component 51 respectively; the buoyancy component 53 includes a limiter 531 and a buoyancy component 53 3. A second limiting cylinder 532 is provided on the limiting member 531, and the buoyancy member 533 is slidably installed in the second limiting cylinder 532. The first contact 521, the second contact 523 and the second limiting cylinder 532 are coaxially arranged to limit the sliding range of the buoyancy member 533, so that the buoyancy member 533 can lift the second contact 523, thereby making the second contact 523 contact with the first contact 521; the buoyancy member 533 rises or falls with the water level in the sampling cylinder 21, thereby making the second contact 523 contact or separate from the first contact 521, and the alarm component 51 is used to determine whether the second contact 523 is in contact with the first contact 521, and to issue an alarm prompt when the second contact 523 is in contact with the first contact 521.

[0045] Example 3, alarm component 51 when the specified depth is shallow

[0046] The alarm component 51 includes a second battery 511 and a buzzer 512. One end of the second battery 511 is electrically connected to the buzzer 512 and the first contact 521 in sequence, and the other end is electrically connected to the second contact 523. Specifically, the buoyancy member 533 floats up as the water level of the groundwater sample in the sampling cylinder 21 rises, thereby lifting the second contact 523 on the elastic membrane 522. When the water level of the groundwater sample in the sampling cylinder 21 reaches a predetermined water level, the second contact 523 contacts the first contact 521, and the circuits at both ends of the second battery 511 are connected, thereby providing power to the buzzer 512, causing the buzzer 512 to start and emit a sound to alert the staff.

[0047] Please refer to Figure 11 , Example 4, specifying an alarm component 51 when the depth is deep

[0048] The alarm assembly 51 includes a second battery 511, a signal generator 513, a wearable ring 514, a third battery 515, a signal receiver 516 and a vibration alarm 517. One end of the second battery 511 is electrically connected to the signal generator 513 and the first contact 521 in sequence, and the other end is electrically connected to the second contact 523; the third battery 515, the signal receiver 516 and the vibration alarm 517 are all installed on the wearable ring 514, the third battery 515 is electrically connected to the signal receiver 516 and the vibration alarm 517 respectively, the signal receiver 516 is electrically connected to the vibration alarm 517, and is electrically connected to the signal generator 513 and the first contact 521 in sequence. The generator 513 is communicated; specifically, the buoyancy member 533 floats as the water level of the groundwater sample in the sampling cylinder 21 rises, thereby lifting the second contact 523 on the elastic membrane 522. When the water level of the groundwater sample in the sampling cylinder 21 reaches the predetermined water level, the second contact 523 contacts the first contact 521, and the circuits at both ends of the second battery 511 are connected, thereby providing power to the signal generator 513. The signal generator 513 starts and sends a start signal to the signal receiver 516. After receiving the start signal, the signal receiver 516 starts the vibration alarm 517 to send a vibration signal to remind the staff.

[0049] Example 5, steps for using the groundwater fixed depth sampling device 10

[0050] 1. Press the current controller 43 to make the electromagnet 31 attract the float 32 and close the water sampling hole 23;

[0051] 2. Place the sampling tube 21 into the sampling well and shake the spool 42 to gradually lower the sampling tube 21;

[0052] 3. Obtain the depth of the sampling tube 21 into the sampling well from the depth scale line on the wire 41, and stop shaking the spool 42 after reaching the specified depth;

[0053] 4. Press the current controller 43 to make the electromagnet 31 repel the float 32, open the water sampling hole 23, and allow groundwater to enter the sampling tube 21;

[0054] 5. After the alarm component 51 issues an alarm, press the current controller 43 to make the electromagnet 31 attract the float 32 and close the water sampling hole 23;

[0055] 6. Shake the spool 42 so that the wire 41 pulls the sampling tube 21 out of the sampling well;

[0056] 7. Remove the sampling cover 22 and pour out the groundwater sample in the sampling tube 21.

[0057] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A groundwater fixed depth sampling device, characterized in that: The device comprises a sampling assembly, a magnetic switch assembly and a magnetic control assembly. The magnetic switch assembly is installed at the collection end of the sampling assembly, and the magnetic control assembly is electrically connected to the magnetic switch assembly. The sampling assembly is used to collect groundwater samples. The magnetic switch assembly is used to open or close the collection end of the sampling assembly by changing its own magnetism. The magnetic control assembly is used to control the magnetism change of the magnetic switch assembly to keep the collection end of the collection assembly in a closed state before the collection assembly reaches a specified depth.

2. The groundwater constant depth sampling device according to claim 1, characterized in that: The sampling assembly includes a sampling tube and a sampling cover. The bottom end of the sampling tube is provided with a water sampling hole for collecting groundwater samples. The sampling cover is installed on the top end of the sampling tube.

3. The groundwater constant depth sampling device according to claim 2, characterized in that: The magnetic switch assembly includes an electromagnet, a float and a first limiting cylinder. The electromagnet is fixedly installed in the interlayer between the water sampling hole and the outer wall of the sampling cylinder. The two sides of the electromagnet are electrically connected to the magnetic control assembly respectively to adjust the magnetism of the electromagnet through the magnetic control assembly. The first limiting cylinder is installed on the top of the water sampling hole. The float is slidably installed in the first limiting cylinder. The float is equipped with a magnet so that it approaches or moves away from the top of the water sampling hole as the magnetism of the electromagnet changes, thereby opening or closing the water sampling hole.

4. The groundwater constant depth sampling device according to claim 3, characterized in that: The magnetic control component includes two wires, a spool, a current controller and a first battery. One end of each wire is connected to one side of the electromagnet, and the other end is connected to the current controller after passing through the spool to store the wires. The current controller is electrically connected to the first battery. The current controller is used to control the direction of the current in the two wires, thereby adjusting the magnetism of the electromagnet. The first battery is used to power the current controller and the electromagnet.

5. The groundwater constant depth sampling device according to claim 4, characterized in that: Each wire is marked with a depth scale to obtain the depth of the sampling tube into the sampling well.

6. The groundwater constant depth sampling device according to claim 2, characterized in that: The sampling assembly further comprises a weight ring, which is fixedly mounted on the outside of the sampling barrel so as to enable the sampling barrel to sink into groundwater.

7. The groundwater constant depth sampling device according to claim 2, characterized in that: The sampling assembly also includes a plurality of connecting rods of the same structure, the bottom end of each connecting rod is used to be fixedly connected to the top end of the sampling cover or the top end of another connecting rod, so that the sampling tube can be extended into the groundwater through the connecting rod.

8. The groundwater constant depth sampling device according to claim 2, characterized in that: The groundwater fixed-depth sampling device also includes an alarm component, which includes an alarm assembly, a trigger assembly and a buoyancy assembly. The alarm assembly, trigger assembly and buoyancy assembly are installed in the sampling cover in sequence from top to bottom. The trigger assembly includes a first contact, an elastic membrane and a second contact. The elastic membrane is arranged below the first contact, and the second contact is arranged on the elastic membrane. The first contact and the second contact are electrically connected to the two ends of the alarm component respectively; the buoyancy assembly includes a limit piece and a buoyancy piece, and the limit piece is provided with a second limit cylinder. The buoyancy piece can be slidably installed in the second limit cylinder, and the first contact, the second contact and the second limit cylinder are coaxially arranged; the buoyancy piece rises or falls with the water level in the sampling cylinder, so that the second contact contacts or separates from the first contact. The alarm component is used to determine whether the second contact contacts the first contact, and to issue an alarm prompt when the second contact contacts the first contact.

9. The groundwater constant depth sampling device according to claim 8, characterized in that: The alarm component includes a second battery and a buzzer, one end of the second battery is electrically connected to the buzzer and the first contact in sequence, and the other end is electrically connected to the second contact; the buzzer is used to determine whether the second contact is in contact with the first contact, and to issue an alarm prompt when the second contact is in contact with the first contact.

10. The groundwater constant depth sampling device according to claim 8, characterized in that: The alarm component includes a second battery, a signal generator, a wearable ring, a third battery, a signal receiver and a vibration alarm. One end of the second battery is electrically connected to the signal generator and the first contact in sequence, and the other end is electrically connected to the second contact for powering the signal generator; the third battery, signal receiver and vibration alarm are all installed on the wearable ring, and the third battery is electrically connected to the signal receiver and the vibration alarm respectively for powering the signal receiver and the vibration alarm. The signal receiver is electrically connected to the vibration alarm and is communicatively connected to the signal generator; the signal generator is used to determine whether the first contact is in contact with the second contact, and sends a start signal to the signal receiver when the first contact is in contact with the second contact. The vibration alarm is used to determine whether the signal receiver receives the start signal, and sends an alarm prompt when the signal receiver receives the start signal.

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