An automatic water sampling device for municipal water supply and drainage inspection wells and a water sampling method using the same

Abstract

The present invention relates to the technical field of water sample detection, and particularly relates to an automatic water sampling device for municipal water supply and drainage inspection wells, which includes two support rods. A main motor shaft is installed between the two support rods. A storage battery, a controller and a main motor are arranged in one of the support rods. The controller is electrically connected to the main motor, and the storage battery supplies power to the controller and the main motor. A first rope is wound around the main motor shaft, and the free end of the first rope is connected to a first sampling container. Sliding rails are also provided at the bottoms of the two support rods. A sliding rod is slidably arranged on the sliding rails. A baffle is hinged to the sliding rod. Both ends of the sliding rod are connected with sliders adapted to the sliding rails. A plurality of positioning holes are formed in the sliding rails, and the sliders are hinged with locking hooks. The present invention can automatically control the lowering and rising of the sampling container to complete sampling, with a simple and efficient process, without the need for manual forward tilting of the probe to extend into the inspection well for wire releasing and lifting, and the sampling is safer. The present invention also provides a method for taking water samples by using the automatic water sampling device for municipal water supply and drainage inspection wells.

Description

Technical Field

[0001] The present invention relates to the technical field of water sample detection, and in particular to an automatic water sampling device for a municipal water supply and drainage inspection well and a water sampling method using the same. Background Art

[0002] Water quality sampling and testing is a routine work content in the operation and maintenance management of municipal water supply and drainage, and is an important means to check whether there is any mixing, wrong connection, inflow and infiltration in the pipeline. At present, in water quality sampling, a simple manual handheld retractable water bottle is used for sampling. This sampling method has the following disadvantages: on the one hand, the operator needs to lean forward and extend the probe into the top of the inspection well to lower the sampling bottle to find the water sampling position in the well. During the operation, there is a risk of people falling into the inspection well; on the other hand, the sampling bottle body is generally open at the top, and the bottle body has a certain height. When the water level in the inspection well is low and lower than the bottle height, normal sampling cannot be performed. At this time, the operator needs to go down the well to lay the bottle flat for sampling, which is time-consuming and labor-intensive, and there are also safety risks when going down the well, which causes many inconveniences to the water sampling personnel. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides an automated water sampling device for a municipal water supply and drainage inspection well. The present invention completes sampling by automatically controlling the descent and ascent of a sampling container, making sampling safer and more efficient.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: an automated water sampling device for a municipal water supply and drainage inspection well, comprising two support rods, bearings are installed at one end of the two support rods, and a main motor shaft is installed between the two bearings, wherein a battery, a controller and a main motor are arranged in one of the support rods, the main motor is connected to the main motor shaft, the controller is electrically connected to the main motor, the battery supplies power to the controller and the main motor, a first rope is wound around the main motor shaft, and the free end of the first rope is connected to a first sampling container; a slide rail is also provided at the bottom of the two support rods, a slide rod is slidably arranged on the slide rail, a baffle is hinged on the slide rod, both ends of the slide rod are connected to sliders adapted to the slide rail, a plurality of positioning holes are provided on the slide rail, the slider is hinged to a locking hook, and the locking hook is inserted into the positioning hole after rotation, so as to limit the rotation of the baffle.

[0005] In a preferred embodiment, auxiliary motors are installed on the two support rods, and a gear is installed on the rotating shaft of the auxiliary motors. Spring sheets are also fixedly connected to the two support rods, and the free ends of the spring sheets cooperate with the gears and move in the tooth grooves of the gears as the gears rotate. A second rope is wound on the rotating shaft of the auxiliary motors, and the free ends of the two second ropes are connected to the second sampling containers.

[0006] In a preferred embodiment, the second sampling container is a suction sampling bottle.

[0007] In a preferred embodiment, the suction sampling bottle comprises a sampling bottle body, a piston adapted to the sampling bottle body is movably arranged in the sampling bottle body, the piston is fixedly connected to one end of a piston rod, the other end of the piston rod extends out of the sampling bottle body and is fixedly connected to the bottom of a first sampling container, and a water inlet is arranged on the side wall of the bottom of the sampling bottle body.

[0008] In a preferred embodiment, the second sampling container is a hollow cube.

[0009] In a preferred embodiment, the first sampling container is a hollow cube or a cylinder.

[0010] In a preferred embodiment, a leak-proof device is movably arranged on the side wall of the second sampling container, and the leak-proof device is pressed and sealed with the water inlet under the jacking action of the piston.

[0011] In a preferred embodiment, "¬"-shaped brackets are arranged at the four corners of the top of the second sampling container, a water inlet box is connected to the side wall of the bottom of the second sampling container, and the water inlet is arranged at the bottom of the water inlet box; the leak-proof device comprises a tray within the limiting range of the "¬"-shaped bracket and a connecting plate fixedly connected to the side edge of the tray, a sealing plate is connected to the bottom of the connecting plate, a sliding groove for the up-and-down movement of the leak-proof device is formed on the side wall of the sampling bottle body, and the sealing plate is pressed and sealed with the water inlet after the leak-proof device rises.

[0012] In a preferred embodiment, handles are arranged at the tops of the first sampling container and the second sampling container, and the first rope and the second rope are respectively connected to the handles of the first sampling container and the second sampling container.

[0013] The present invention also provides a method for taking water samples by using an automatic water sampling device for a municipal water supply and drainage inspection well, comprising the following steps:

[0014] 1) Open the baffle from the bottom of the support rod to a state perpendicular to the support rod, place the support rod on the ground and pass it through the center of the wellhead, place the baffle in the well, slide and adjust the position interval between the two side baffles according to the size of the wellhead so that the baffle abuts against the well wall, insert the rotary hook into the positioning hole of the support rod for fixation, and adjust the initial positions of the first sampling container and the second sampling container to be adjacent to the lower part of the main motor;

[0015] 2) Start the main motor, the first sampling container drives the second sampling container to descend uniformly through the piston rod, and drives the auxiliary motor to rotate and pay out the wire, and the main motor and the auxiliary motor count the number of rotation turns;

[0016] 3) When the lifting force of the main motor increases to be equal to the tension of the first rope after the first sampling container is filled with water, proceed to step 4); otherwise, continue to lower the first sampling container and the second sampling container until the lifting force of the main motor significantly decreases, and then proceed to step 4).

[0017] 4) The main motor stops rotating, and the controller sets the total number of rotation cycles during the downward movement of the main motor as the target value of the rotation cycles during the upward movement.

[0018] 5) The controller controls the main motor to reverse and wind the wire to pull the first sampling container to rise uniformly, and counts the number of rotation cycles of the rise; when the number of rotation cycles of the main motor reaches the number of cycles during the downward movement, it stops rotating and closes the brake.

[0019] 6) The controller controls the auxiliary motor to reverse and wind the wire. When the number of rotation cycles of the auxiliary motor reaches the number of cycles during the downward movement, it stops rotating and closes the brake, completing the sampling.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. When in use, the present invention can be placed on the inspection well, automatically control the sampling container to descend and rise to complete sampling. The process is simple and efficient. There is no need for manual forward inclination of the probe to extend into the inspection well for wire release and lifting, and the sampling is safer.

[0022] 2. The present invention utilizes the principle of sucking water by air pressure difference. By moving the piston, the water pressure is forced into the sampling container by the pressure difference, thereby completing the automatic sampling in the inspection well with a low liquid level without the need for manual work in the well.

[0023] 3. The present invention clamps the sampling device tightly on the wellhead through a mechanical structure, and the sampling process is more stable and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a three-dimensional structure schematic diagram of Embodiment 1 of the present invention.

[0025] Figure 2 It is a structure schematic diagram of the support rod in the present invention.

[0026] Figure 3 It is an external structure schematic diagram of the support rod in the present invention.

[0027] Figure 4 It is Figure 3 a magnified structure schematic diagram of part A in

[0028] Figure 5 It is Figure 3 a magnified structure schematic diagram of part B in

[0029] Figure 6 It is a structure schematic diagram of the baffle in the present invention.

[0030] Figure 7 It is a schematic structural diagram of Embodiment 2 of the present invention.

[0031] Figure 8 It is a schematic structural diagram of the piston and the piston rod in the present invention.

[0032] Figure 9 It is a schematic structural diagram of the sampling bottle body in the present invention.

[0033] Figure 10 It is Figure 9 The enlarged structural diagram of part C in

[0034] Figure 11 It is a schematic structural diagram of the leak-proof device of the present invention.

[0035] Figure 12 It is a schematic diagram of the state during the descending process of the present invention.

[0036] Figure 13 It is a schematic diagram of the state at the initial position during the ascending process of the present invention.

[0037] Figure 14 It is a schematic diagram of the state during the ascending process of the present invention.

[0038] In the above-mentioned drawings: 10, support rod; 11, bearing; 12, main motor shaft; 13, storage battery; 14, controller; 15, main motor; 16, first rope; 17, slide rail; 18, slide bar; 19, baffle; 20, slider; 21, positioning hole; 22, locking hook; 23, auxiliary motor; 24, gear; 25, spring piece; 26, second rope; 30, first sampling container; 40, second sampling container; 41, sampling bottle body; 42, piston; 43, piston rod; 44, bracket; 45, water inlet box; 46, water inlet; 47, chute; 50, leak-proof device; 51, support plate; 52, connecting plate; 53, sealing plate. Detailed implementation manners

[0039] The technical solutions in the present invention will be further described below with reference to the drawings and embodiments.

[0040] Embodiment 1

[0041] Refer to the attached Figure 1 - attached Figure 6, as an embodiment of the present invention, an automatic water sampling device for municipal water supply and drainage inspection wells is proposed. It includes two support rods 10. Bearings 11 are installed at one ends of the two support rods 10, and a main motor shaft 12 is installed between the two bearings 11. A storage battery 13, a controller 14, and a main motor 15 are arranged in one of the support rods 10. The main motor 15 is connected to the main motor shaft 12, the controller 14 is electrically connected to the main motor 15, and the storage battery 13 supplies power to the controller 14 and the main motor 15. A first rope 16 is wound around the main motor shaft 12, and the free end of the first rope 16 is connected to a first sampling container 30; Sliding rails 17 are also provided at the bottoms of the two support rods 10. A sliding rod 18 is slidably arranged on the sliding rails 17. A baffle 19 is hinged to the sliding rod 18. Both ends of the sliding rod 18 are connected to sliders 20 adapted to the sliding rails 17. A plurality of positioning holes 21 are provided on the sliding rails 17. The slider 20 is hinged to a locking hook 22. After the locking hook 22 rotates, it can be inserted into the positioning hole 21 to limit the rotation of the baffle 19.

[0042] In this embodiment, the support rod 10 is of a cuboid structure. The bottom of the support rod 10 is hollowed out. The two sides of the hollowed-out part are the sliding rails 17 with U-shaped grooves, and the positioning holes 21 are opened on the side of the sliding rails 17; The sliding rod 18 is a cuboid rod, and the sliding rod 18 moves along the sliding rails 17 at the bottom of the support rod 10 through the sliders 20 connected to its two ends; The baffle 19 is a rectangular flat plate. Both ends of one short side of the baffle 19 are hinged to the middle rod of the sliding rod 18, so that the baffle 19 can rotate around the sliding rod 18; The locking hook 22 is T-shaped, placed outside the slider 20 and hinged to it, so that the locking hook 22 can rotate around the slider 20. After the sliding rod 18 is positioned in the sliding rail 17, the locking hook 22 can be inserted into the positioning hole 21 for locking; The first sampling container 30 is of a hollow cube structure or a hollow cylinder structure; Handles 31 are provided at the tops of the first sampling containers 30, and the first rope 16 is connected to the handle 31 of the first sampling container 30.

[0043] Embodiment 2

[0044] Refer to the attached Figure 1 - attached Figure 14As a preferred embodiment of the present invention, on the basis of embodiment 1, an auxiliary motor 23 is further installed on the two support rods 10, the main motor 15 and the auxiliary motor 23 are servo motors, a gear 24 is installed on the rotating shaft of the auxiliary motor 23, and a spring sheet 25 is also fixedly connected to the two support rods 10, the free end of the spring sheet 25 cooperates with the gear 24 and moves in the tooth groove of the gear 24 as the gear 24 rotates, a second rope 26 is wound around the rotating shaft of the auxiliary motor 23, and the free ends of the two second ropes 26 are connected to the second sampling container 40, and the second sampling container 40 is a suction sampling bottle; the suction sampling bottle includes a sampling bottle body 41, a piston 42 adapted to the sampling bottle body 41 is movably arranged in the sampling bottle body 41, and the piston 42 is fixedly connected to one end of the piston rod 43, and the piston rod The other end of 43 extends out of the sampling bottle body 41 and is fixedly connected to the bottom of the first sampling container 30. A water inlet 46 is arranged on the bottom side wall of the sampling bottle body 41; a leak-proof device 50 is movably arranged on the side wall of the second sampling container 40, and a "¬"-shaped bracket 44 is arranged at the four corners of the top of the second sampling container 40. The bottom side wall of the second sampling container 40 is connected to a water inlet box 45, and the water inlet 42 is arranged at the bottom of the water inlet box 45; the leak-proof device 50 includes a supporting plate 51 located within the limit range of the "¬"-shaped bracket 44, and a connecting plate 52 fixedly connected to the side of the supporting plate 51, and the bottom of the connecting plate 52 is connected to a sealing plate 53. A slide groove 47 for the leak-proof device 50 to move up and down is opened on the side wall of the sampling bottle body 41, and the sealing plate 53 is pressed and sealed with the water inlet 46 after the leak-proof device rises.

[0045] In this embodiment, the second sampling container 40 is a hollow cubic structure.

[0046] In this embodiment, the auxiliary motor 23 is installed on the convex platform protruding from the lower inner side of the support rod 10, and the gear 24 is installed on the rotating shaft of the auxiliary motor 23; one end of the spring piece 25 is fixed on the convex platform, and the other end is located in the tooth space of the gear 24; the second rope 26 is wound around the rotating shaft of the auxiliary motor 23, and the other end of the first rope 16 on the main motor 15 is fixed on the handle 31 of the first sampling container 30, and the free end of the second rope 26 on the auxiliary motor 23 is fixedly connected to both sides of the second sampling container 40; the piston rod 43 is in an inverted "T" shape, one end is fixedly connected to the outer surface of the bottom of the first sampling container 30, and the other end is located inside the second sampling container 40 and can move up and down along the inner surface of the second sampling container 40; through holes are opened at the bottoms of both sides of the second sampling container 40 and a square water inlet box 45 extends out along the through holes, and the bottom of the water inlet box 45 is provided as a water inlet 46, which serves as the inlet and outlet when the second sampling container 40 takes water. At the same time, the upper end of the second sampling container 40 is open, and "¬" shaped brackets 44 extend out from the four corners of the upper end surface for supporting the first sampling container 30. At the same time, the bottom surface of the bracket 44 serves as the upper limit surface when the leak-proof device 50 moves up and down. Sliding grooves 47 for the leak-proof device 50 to move up and down are opened in the middle of the wall bodies on both sides of the sampling bottle body 41, and the upper end surface of the sampling bottle body 41 serves as the lower limit surface when the leak-proof device 50 moves up and down; in the self-weight state of the leak-proof device 50, the tray 51 is located on the lower limit surface. When it is pushed up by the piston 42 and lifted to the height of the upper limit surface and contacts it, at this time, the upper surface of the bottom of the sealing plate 53 just coincides with the end surface of the water inlet 46. Therefore, the leak-proof device 50 can make the sealing plate 53 in close contact with the water inlet 46 of the second sampling container 40 through vertical movement, so as to seal or pour out the water sample.

[0047] In the design process of this embodiment, it should be noted that before the start of the descending process, it is necessary to ensure that the piston 42 is in close contact with the inner surface of the bottom of the second sampling container 40 to ensure that the inside of the second sampling container 40 is a vacuum or a quasi-vacuum low-pressure area; when the first sampling container 30 starts to rise, it drives the piston 42 to move upward in the second sampling container 40 to create space and sucks in the water sample by using the pressure difference. Therefore, the following four conditions need to be met:

[0048] (1) The second sampling container 40 can hover when it is not affected by the first sampling container 30 and the piston 42. Since the second rope 26 connecting the second sampling container 40 is wound around the auxiliary motor 23, when the auxiliary motor 23 pays out the line and rotates, the force that drives the gear 24 to rotate needs to be greater than the maximum elastic force of the spring piece 25. If it can hover, the auxiliary motor 23 will not pay out the line and rotate in the natural state, that is, it is necessary to ensure that the gravity of the second sampling container 40 is not greater than the maximum elastic force of the spring piece 25, Gdown ≤ Fmax (spring piece);

[0049] (2) The first sampling container 30 and the piston 42 can naturally descend until the piston 42 is in tight contact with the inner surface of the second sampling container 40. It is necessary to ensure that the gravity of the first sampling container 30 and the piston 42 is greater than the frictional force between the piston 42 and the second sampling container 40 during the descent of the piston 42, that is, G_up > F_friction;

[0050] (3) After the piston 42 is in close contact with the second sampling container 40, the first sampling container 30 and the piston 42 can push the second sampling container 40 to descend together. Then, G_up + G_down > F_max (spring piece);

[0051] (4) When the first sampling container 30 rises and drives the piston 42 to move and rise in the second sampling container 40, it is necessary to ensure that the second sampling container 40 does not move upward with the piston 42. Then, the upward frictional force generated by the piston 42 during movement on the second sampling container 40 should be less than the gravity of the second sampling container 40, that is: F_friction < G_down.

[0052] The method for collecting water samples using the automatic water sampling device for municipal water supply and drainage inspection wells in this embodiment includes the following steps:

[0053] 1) Open the baffle 19 from the bottom of the support rod 10 to a state perpendicular to the support rod 10. Place the support rod 10 on the ground and pass it through the center of the wellhead, so that the baffle 19 is placed in the well. Slide and adjust the position interval between the two baffles 19 according to the wellhead size, so that the baffle 19 abuts against the well wall. Rotate the locking hook 22 and insert it into the positioning hole 21 of the support rod 10 for fixation. Adjust the initial positions of the first sampling container 30 and the second sampling container 40 to be immediately below the main motor 15;

[0054] 2) Start the main motor 15. The first sampling container 30 pushes the second sampling container 40 to descend uniformly through the piston rod 43, and drives the auxiliary motor 23 to rotate and pay out the wire. The main motor 15 and the auxiliary motor 23 count the number of rotation turns;

[0055] 3) When the pulling force of the main motor 15 increases to be equal to the pulling force of the first rope 16 after the first sampling container 30 is filled with water, enter step 4); otherwise, continue to lower the first sampling container 30 and the second sampling container 40 until the pulling force of the main motor 15 decreases significantly, and then enter step 4);

[0056] 4) The main motor 15 stops rotating. The controller 14 sets the total number of rotation turns during the descent of the main motor 15 as the rotation turn target value during the ascent;

[0057] 5) The controller 14 controls the main motor 15 and the auxiliary motor 23 to reverse and take up the wire to pull the first sampling container 30 to rise uniformly, and counts the number of rotation turns during the ascent; when the number of turns of the main motor 15 during the ascent reaches the number of turns during the descent, stop rotating and close the brake,

[0058] 1) The controller 14 controls the auxiliary motor 23 to reverse and reel in the wire. When the number of turns of the auxiliary motor 23 when rising reaches the number of turns when descending, the auxiliary motor 23 stops rotating, closes the brake, and completes sampling.

[0059] In this method, step 3) is designed in combination with the dynamic water intake process after the first water intake container 30 and the second water intake container 40 enter the water body. In the present invention, the first water intake container 30 and the second water intake container 40 are connected by a piston rod 43, and the lower end of the piston rod 43 is connected to the piston 42. Therefore, during the descent of the first water intake container 30 and the second water intake container 40, the second water intake container 40 first contacts the water surface. After the first water intake container 30 sinks below the water surface, the water in the well is poured into the first water intake container 30 from the top of the first water intake container 30. When the first water intake container 30 is filled with water, the lifting force of the main motor 15 reaches the first peak value. At this time, the state is: the first water intake container is full of water, and the second water intake container 40 is located in the water. Below the surface, at this time, you only need to reverse the main motor 15 to reel in the line to complete the water intake of the second water intake container 40, and the water intake process is as follows: when the first water intake container 30 rises, the piston rod 43 pulls the piston 42 in the second water intake container 40 to rise relative to the second water intake container 40, so negative pressure appears inside the second water intake container 40, and the external water pressure presses water into the second water intake container 40. When the piston 42 reaches the top of the second water intake container 40 and further lifts the support plate 51 of the floor release device 50, the sealing plate 53 rises accordingly and seals the water inlet 46 of the water inlet box 45. Under the continued lifting action of the main motor 15, the first water intake container 30 and the second water intake container 40 rise to the wellhead to complete water intake; after water intake is completed, the locking hook 22 can be released to disassemble the entire device.

[0060] In step 3), there is another situation. When the water depth in the well is insufficient, after the first water intake container 30 and the second water intake container 40 are lowered, the lifting force of the main motor 15 will not increase, but will significantly decrease under a certain state. At this time, it can be judged that the water depth in the well is not enough to fill the first water intake container 30 with water, and at the same time, it can be judged that the second water intake container 40 has sunk to the bottom of the well. At this time, the second water intake container 40 is mainly used to complete water intake. When the lifting force of the main motor 15 is significantly reduced, the main motor 15 is controlled to reverse and reel in the line, and then the water intake process of the second water intake container 40 is completed.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. An automatic water sampling device for municipal water supply and drainage inspection wells, characterized in that: The invention comprises two supporting rods, bearings are installed at one end of the two supporting rods, and the main motor shaft is installed between the two bearings, wherein a battery, a controller and a main motor are arranged in one of the supporting rods, the main motor is connected to the main motor shaft, the controller is electrically connected to the main motor, the battery supplies power to the controller and the main motor, a first rope is wound around the main motor shaft, and the free end of the first rope is connected to the first sampling container; a slide rail is also provided at the bottom of the two supporting rods, a slide rod is slidably arranged on the slide rail, a baffle is hinged on the slide rod, both ends of the slide rod are connected to sliders adapted to the slide rail, a plurality of positioning holes are provided on the slide rail, the slider is hinged to a locking hook, and the locking hook is inserted into the positioning hole after rotation, so as to limit the rotation of the baffle; an auxiliary motor is also installed on the two supporting rods, and a gear is installed on the rotating shaft of the auxiliary motor; a spring sheet is also fixedly connected to the two supporting rods, and the spring The free end of the sheet cooperates with the gear and moves in the tooth groove of the gear as the gear rotates, a second rope is wound around the rotating shaft of the auxiliary motor, and the free ends of the two second ropes are connected to the second sampling container. Handles are arranged on the tops of the first sampling container and the second sampling container, and the first rope and the second rope are respectively connected to the handles of the first sampling container and the second sampling container; the second sampling container is a suction sampling bottle, and the suction sampling bottle comprises a sampling bottle body, a piston adapted to the sampling bottle body is movably arranged in the sampling bottle body, the piston is fixedly connected to one end of the piston rod, and the other end of the piston rod extends out of the sampling bottle body and is fixedly connected to the bottom of the first sampling container, and a water inlet is arranged on the side wall of the bottom of the sampling bottle body; a leak-proof device is movably arranged on the side wall of the second sampling container, and the leak-proof device is pressed and sealed with the water inlet under the lifting action of the piston; "¬"-shaped brackets are arranged at the four corners at the top of the second sampling container, and the bottom side wall of the second sampling container is connected to a water inlet box, and the water inlet is arranged at the bottom of the water inlet box; the leak-proof device includes a support plate located within the limiting range of the "¬"-shaped bracket and a connecting plate fixedly connected to the side of the support plate, the bottom of the connecting plate is connected to a sealing plate, and a sliding groove for the leak-proof device to move up and down is opened on the side wall of the sampling bottle body, and the sealing plate is pressed and sealed with the water inlet after the leak-proof device rises.

2. The automatic water sampling device for municipal water supply and drainage inspection wells according to claim 1, characterized in that: The second sampling container is a hollow cube.

3. The automatic water sampling device for municipal water supply and drainage inspection wells according to claim 1, characterized in that: The first sampling container is a hollow cube or cylinder.

4. A method for collecting water samples using the automated water sampling device for municipal water supply and drainage inspection wells according to any one of claims 1 to 3, characterized in that, The following steps are involved: 1) Open the baffle from the bottom of the support rod to a vertical position with the support rod, place the support rod on the ground and pass through the center of the wellhead, place the baffle in the well, and slide and adjust the position interval between the baffles on both sides according to the size of the wellhead so that the baffles are against the well wall, insert the rotating lock hook into the positioning hole of the support rod to fix it, and adjust the initial position of the first sampling container and the second sampling container to be close to the bottom of the main motor; 2) Start the main motor, the first sampling container pushes the second sampling container down at a uniform speed through the piston rod, and drives the auxiliary motor to rotate and release the line, and the main motor and the auxiliary motor count the number of rotations; 3) When the lifting force of the main motor increases to be equal to the tension of the first rope after the first sampling container is filled with water, proceed to step 4); otherwise, continue to lower the first sampling container and the second sampling container until the lifting force of the main motor significantly decreases, and then proceed to step 4). 4) The main motor stops rotating, and the controller sets the total number of rotation circles of the main motor during the descent as the rotation circle number target value during the ascent. 5) The controller controls the main motor to reverse and take in the wire to pull the first sampling container to rise at a constant speed, and counts the number of rotation circles during the ascent; when the number of rotation circles of the main motor reaches the number of rotation circles during the descent, it stops rotating and closes the brake. 6) The controller controls the auxiliary motor to reverse and take in the wire. When the number of rotation circles of the auxiliary motor reaches the number of rotation circles during the descent, it stops rotating and closes the brake to complete the sampling.

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