Intelligent sampling device and sampling method for hydrographic surveying

Abstract

This invention relates to the field of sampling equipment technology, and discloses an intelligent sampling device and method for hydrological mapping. The intelligent sampling device includes a main body, which comprises a connecting frame, a boom, a controller, and a support frame; an extension unit, which includes support plates installed on the upper and lower sides inside the connecting frame, with multiple sets of movable arms evenly distributed in a ring around the two sets of support plates, and connecting rods rotatably connected to the movable arms via rotating shafts; and a sampling unit, which is mounted on the support frame and adjusts the sampling range of the sampling unit by swinging the support frame inward or outward. This invention, by setting up the extension unit and using a motor to drive the threaded rod to rotate, causes the threaded sleeve to move axially, which in turn drives the movable arms to swing around the support plates, ultimately causing multiple sets of support frames to synchronously swing in a ring around the connecting frame, achieving radial adjustment of the sampling range of the sampling unit and adapting to the mapping needs of different water areas.

Description

Technical Field

[0001] This invention relates to the field of sampling equipment technology, and more specifically, to an intelligent sampling device and sampling method for hydrological mapping. Background Technology

[0002] Hydrological surveying is a crucial foundational task in water resources management, water environment monitoring, and water conservancy project construction. Water sampling, a key component of hydrological surveying, directly impacts the accuracy and reliability of water quality monitoring data due to the scientific nature of its sampling methods and the sophistication of its equipment.

[0003] In existing technologies, traditional hydrological sampling equipment mainly includes the following types: First, fixed samplers, which have a simple structure and are usually a single sampling container. They are manually placed in the water to take samples, and the sampling position is fixed and the sampling range cannot be adjusted. Second, portable sampling rods, which require manual operation to extend the sampling head to the target water depth. The sampling depth is limited, and the operation is labor-intensive and inefficient. Third, shipborne sampling equipment, which can expand the sampling area, but usually requires a professional survey vessel, which is costly and has limited operation in narrow waters or complex terrain conditions.

[0004] However, existing sampling equipment generally suffers from the following technical defects: First, the sampling range is limited and the radial adjustment capability is insufficient. Existing sampling equipment can usually only sample at a single fixed point and cannot achieve radial range adjustment with the equipment center as the axis. When multiple points need to be sampled simultaneously on a cross-section of a water area, existing equipment needs to be lowered and operated multiple times, which is inefficient and cannot meet the needs of rapid mapping of large areas of water.

[0005] Second, it relies primarily on single-point sampling and cannot achieve stratified synchronous sampling. Traditional sampling equipment is usually equipped with only a single sampling head, which can only collect water samples from one point at a time. If stratified sampling of different layers at the same water depth is required, multiple operations or multiple sets of equipment are needed, which is complex and cannot guarantee the synchronicity and comparability of samples from different layers.

[0006] In summary, existing hydrological sampling equipment has significant shortcomings in terms of sampling range adjustment and stratified synchronous sampling, and there is an urgent need for an intelligent sampling device and sampling method for hydrological mapping to solve the above problems. Summary of the Invention

[0007] This invention provides an intelligent sampling device and sampling method for hydrological mapping, which solves the technical problems of existing sampling devices having limited sampling range, inability to achieve radial range adjustment, and inability to achieve simultaneous stratified sampling at different water depths.

[0008] This invention provides an intelligent sampling device for hydrological mapping, comprising: The device body includes a connecting frame, a lifting rod, a controller, and a support frame; The boom is mounted on the connecting frame and is used to control the vertical movement of the connecting frame; The support frame is provided in multiple sets, and the multiple sets of support frames are evenly distributed in a ring on the outside of the connecting frame; Extension unit, multiple sets of the support frame and the connecting frame are connected by extension unit; The extension unit includes a support plate installed on the upper and lower sides inside the connecting frame. Multiple sets of movable arms are evenly distributed in a ring around the two sets of support plates. The movable arms are rotatably connected to the support plates via a rotating shaft. A connecting rod is rotatably connected to the movable arm via the rotating shaft, so as to drive the movable arm to swing inward or outward through the connecting rod to adjust the position of the support frame. A sampling unit is mounted on the support frame, and the sampling range of the sampling unit can be adjusted by swinging the support frame inward or outward.

[0009] As a further optimization of the present invention, threaded rods are provided on the sides of the two sets of bearing plates that are far apart from each other, and the two ends of the threaded rods are rotatably connected to the connecting frame and the bearing plate respectively through bearings. A threaded sleeve is threaded onto the threaded rod, and the end of the connecting rod that is far away from the movable arm is rotatably connected to the threaded sleeve through a rotating shaft. Motors are installed on the two sets of bearing plates, and the output shaft of the motor passes through one set of bearing plates and is fixedly connected to the threaded rod.

[0010] As a further optimization of the present invention, a connecting shaft is provided between the two sets of bearing disks, and the two ends of the connecting shaft are rotatably connected to the bearing disks through bearings. Gears are installed at both ends of the threaded rod and the connecting shaft, and the two sets of gears are meshed together.

[0011] As a further optimization of the present invention, the support frame is provided with a sliding groove near the two sets of movable arms, and a slider is slidably connected inside the sliding groove. The slider and the movable arm are rotatably connected by a rotating shaft. A first spring is also provided inside the sliding groove. One end of the first spring is fixedly connected to the sliding groove, and the other end is fixedly connected to the slider.

[0012] As a further optimization of the present invention, the sampling unit includes a sampling cylinder mounted on a support frame. The sampling cylinder has multiple sampling chambers arranged from top to bottom inside. The sampling cylinder has multiple sampling tubes installed on its exterior, the same number as the sampling chambers. The sampling tubes are respectively connected to the interior of the corresponding sampling chambers. A piston block is slidably connected inside the multiple sampling chambers. A piston rod is slidably connected inside the sampling cylinder. The piston rod passes through the multiple sampling chambers and is fixedly connected to the piston block.

[0013] As a further optimization of the present invention, an isolation unit is provided at the end of the sampling tube away from the sampling cylinder. The isolation unit includes a connecting rod disposed on one side of the sampling cylinder. Multiple sets of sealing plugs corresponding to the position of the sampling tube are installed on the connecting rod, and a filter cylinder is installed on the sealing plug.

[0014] As a further optimization of the present invention, the filter cylinder is slidably connected to the inside of the sampling tube, and the filter cylinder has multiple sets of filter holes.

[0015] As a further optimization of the present invention, a guide rod is slidably connected inside the connecting rod, and the guide rod is installed on the sampling cylinder. A locking nut is threaded onto the guide rod, and a second spring is provided on the guide rod.

[0016] As a further optimization of the present invention, one end of the piston rod extends through the sampling cylinder to the outer surface of the sampling cylinder, an electric push rod is installed on the support frame, and the telescopic end of the electric push rod is fixedly connected to the piston rod. A limiting plate is also installed on the piston rod, and the limiting plate and the connecting rod are engaged.

[0017] Another aspect of the present invention provides an intelligent sampling method for hydrological mapping, using an intelligent sampling device for hydrological mapping as described above, comprising the following steps: Step 1: Overall lifting and water depth positioning of the equipment; The controller controls the boom's movement, causing the device body to rise and fall, lowering the equipment to the target water depth. Step 2: Adjust the radial sampling range; The controller drives the extension unit to move, causing multiple sets of support frames to move radially synchronously relative to the device body, which in turn causes the sampling units installed on the support frames to expand outward or retract inward, thereby adjusting the radial sampling coverage of the sampling units. Step 3: Stratified synchronous sampling; The controller controls the electric push rod to drive the piston rod to move along the axial direction of the sampling cylinder, so that multiple independent sampling chambers in the sampling cylinder generate negative pressure simultaneously, and water at different radial positions and different water depths is sucked into the corresponding sampling chambers through the sampling tube to complete the stratified synchronous sampling. Step 4: Filtration and Sealing Protection; Before entering the sampling tube, the water passes through a filter cylinder to filter impurities. After sampling is completed, the limiting plate and the connecting rod disengage simultaneously, thereby releasing the limiting position. The sealing plug automatically seals the sampling tube port under the action of the second spring to prevent water sample leakage. Step 5: Equipment recycling; The controller controls the extension unit to reset, causing the support frame to retract, and then controls the boom to lift and retract the device body.

[0018] The beneficial effects of this invention are as follows: By setting up an extension unit and using a motor to drive the threaded rod to rotate, the threaded sleeve moves axially, which in turn drives the movable arm to swing around the support plate. Ultimately, this drives multiple sets of support frames to synchronously swing in a ring around the connecting frame, achieving radial adjustment of the sampling range of the sampling unit. This adapts to the mapping needs of different water areas and significantly expands the sampling coverage area. Furthermore, by setting multiple sampling chambers inside the sampling cylinder and synchronously driving multiple sets of piston blocks with piston rods, stratified synchronous sampling at different water depths can be completed in one go, ensuring the synchronicity and comparability of samples from different layers and improving sampling efficiency. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural schematic diagram of the present invention; Figure 2 This is a three-dimensional structural diagram of the unfolded state of the present invention; Figure 3 This is a three-dimensional structural diagram of the extension unit of the present invention; Figure 4 This is a partial cross-sectional perspective view of the three-dimensional structure of the extension unit, sampling unit, and isolation unit of the present invention; Figure 5 This is the invention Figure 4 Enlarged view of the structure at point A in the middle; Figure 6 This is a partial three-dimensional structural diagram of the extension unit, sampling unit, and isolation unit of the present invention; Figure 7 This is the invention Figure 6 Enlarged view of the structure at point B in the middle; Figure 8 This is a three-dimensional structural diagram of the sealing plug, filter cylinder, and filter holes of the present invention.

[0020] In the diagram: 100, Device body; 110, Connecting frame; 120, Hanging rod; 130, Controller; 140, Bearing frame; 200, Extension unit; 210, Bearing plate; 220, Movable arm; 230, Connecting rod; 240, Motor; 250, Threaded rod; 260, Threaded sleeve; 270, Connecting shaft; 280, Gear; 290, Slide groove; 291, Sliding block; 292, First spring; 300, Sampling unit; 310, Sampling cylinder; 320, Sampling chamber; 330, Sampling tube; 340, Piston block; 350, Piston rod; 400, Isolation unit; 410, Connecting rod; 420, Sealing plug; 430, Filter cylinder; 440, Filter hole; 450, Guide rod; 460, Locking nut; 470, Second spring; 480, Electric push rod; 490, Limiting plate. Detailed Implementation

[0021] The subject matter described herein will now be discussed with reference to exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and implement the subject matter described herein, and changes may be made to the function and arrangement of the elements discussed without departing from the scope of this specification. Various processes or components may be omitted, substituted, or added as needed in the examples. Furthermore, features described in some examples may be combined in other examples.

[0022] Example 1: According to the appendix Figure 1 To be continued Figure 3 As shown in the figure, an intelligent sampling device for hydrological surveying provided by an embodiment of the present invention mainly includes a device body 100, an extension unit 200, a sampling unit 300, and an isolation unit 400. The device body 100 includes a connecting frame 110, a lifting rod 120, a controller 130, and a support frame 140. The lifting rod 120 is installed on the upper part of the connecting frame 110 and is connected to external lifting equipment, such as the lifting device of a sampling vessel or a handheld telescopic rod, to achieve lifting control of the entire device. The controller 130 is fixedly installed on the connecting frame 110 and serves as the control core of the entire intelligent sampling device. It is used to issue control commands, coordinate the actions of various components, and realize automated sampling operations.

[0023] Multiple sets of support frames 140 are provided. In this embodiment, the number of support frames 140 is preferably three sets. The three sets of support frames 140 are evenly distributed in a ring outside the connecting frame 110. The support frame 140 serves as the mounting carrier for the sampling unit 300. Its position can be radially adjusted with the movement of the extension unit 200, thereby changing the sampling coverage of the sampling unit 300.

[0024] According to the appendix Figure 2 To be continued Figure 5As shown, the extension unit 200 is the core component for realizing the radial range adjustable function of the present invention. The extension unit 200 includes two sets of bearing plates 210, multiple sets of movable arms 220, connecting rods 230, motors 240, threaded rods 250, threaded sleeves 260, connecting shafts 270, gears 280, slides 290, sliders 291, and a first spring 292.

[0025] Two sets of support plates 210 are respectively installed on the upper and lower sides inside the connecting frame 110, and multiple sets of movable arms 220 are evenly distributed in a ring on the outside. In this embodiment, the number of movable arms 220 matches the number of support frames 140. The movable arms 220 and the support plates 210 are rotatably connected by a rotating shaft, so that the movable arms 220 can swing around the rotating shaft.

[0026] A connecting rod 230 is rotatably connected to the movable arm 220 via a pivot, and the other end of the connecting rod 230 is rotatably connected to a threaded sleeve 260. Specifically, a threaded rod 250 is provided on the side of the two sets of bearing plates 210 that are far apart. The two ends of the threaded rod 250 are rotatably connected to the connecting frame 110 and the bearing plate 210 respectively via bearings, so that the threaded rod 250 can rotate around its own axis. A threaded sleeve 260 is threadedly connected to the threaded rod 250. When the threaded rod 250 rotates, the threaded sleeve 260 will move linearly along the axial direction of the threaded rod 250. The movement of the threaded sleeve 260 drives the movable arm 220 to swing inward or outward around the pivot on the bearing plate 210 via the connecting rod 230.

[0027] To achieve synchronous movement of corresponding components on the two sets of bearing plates 210, a connecting shaft 270 is provided between the two sets of bearing plates 210. The two ends of the connecting shaft 270 are rotatably connected to the bearing plates 210 through bearings. Gears 280 are installed at both ends of the threaded rod 250 and the connecting shaft 270, and the two sets of gears 280 are meshed together. When the motor 240 drives the threaded rod 250 on one side to rotate, the threaded rod 250 on the other side and the connecting shaft 270 rotate synchronously through the meshing transmission of the gears 280, so as to realize the synchronous rotation of the threaded rods 250 corresponding to the upper and lower sets of bearing plates 210, and ensure the synchronous movement of multiple sets of movable arms 220.

[0028] The motor 240 is fixedly mounted on the support plate 210, and its output shaft passes through the support plate 210 and is fixedly connected to the threaded rod 250. The controller 130 controls the forward and reverse rotation of the motor 240, thereby controlling the rotation direction of the threaded rod 250, realizing the change of the axial movement direction of the threaded sleeve 260, and ultimately controlling the swing direction of the movable arm 220.

[0029] To ensure smooth motion transmission, grooves 290 are provided on the support frame 140 near the movable arm 220. A slider 291 is slidably connected inside the groove 290, and the slider 291 is rotatably connected to the movable arm 220 via a pivot. The swing of the movable arm 220 is converted into radial movement of the support frame 140 by the sliding of the slider 291 within the groove 290. A first spring 292 is also provided inside the groove 290, with one end fixedly connected to the groove 290 and the other end fixedly connected to the slider 291. The first spring 292 buffers sliding impact, ensuring smooth movement, and also provides a certain rebound force when the equipment resets.

[0030] It should be noted that the controller 130 starts the motor 240, and the output shaft of the motor 240 drives the threaded rod 250 on one side to rotate. The threaded rod 250 and the connecting shaft 270 are driven by gears 280 meshing at both ends, so that the threaded rods 250 corresponding to the upper and lower sets of bearing plates 210 rotate synchronously. The threaded sleeve 260 on the threaded rod 250 moves axially along the rod body, thereby pulling the connecting rod 230 that is hinged to it to move. The connecting rod 230 drives the movable arm 220 to swing inward or outward around the rotating shaft on the bearing plate 210. The end of the movable arm 220 is connected to the slider 291 through the rotating shaft. The slider 291 slides in the groove 290 of the bearing frame 140. The first spring 292 buffers the sliding impact and ensures smooth movement. Finally, it drives multiple sets of bearing frames 140 to swing synchronously in a ring around the connecting frame 110, so as to realize the radial adjustment of the sampling range of the sampling unit 300.

[0031] According to the appendix Figure 2 Appendix Figure 4 To be continued Figure 7 As shown, the sampling unit 300 is mounted on the support frame 140 and includes a sampling cylinder 310, a sampling chamber 320, a sampling tube 330, a piston block 340, and a piston rod 350.

[0032] The sampling cylinder 310 is fixedly installed on the support frame 140. The sampling cylinder 310 has multiple sampling chambers 320 from top to bottom. The sampling chambers 320 correspond to different water depths to achieve stratified sampling. The sampling cylinder 310 is equipped with multiple sampling tubes 330, the same number as the sampling chambers 320. The sampling tubes 330 are connected to the interior of the corresponding sampling chambers 320, so that the water sample in the sampling chambers 320 can enter through the sampling tubes 330.

[0033] A piston block 340 is slidably connected inside the multiple sampling chambers 320. The piston block 340 can slide along the inner wall of the sampling chamber 320. A piston rod 350 is slidably connected inside the sampling cylinder 310. The piston rod 350 passes through the multiple sampling chambers 320 and is fixedly connected to the piston block 340 respectively. When the piston rod 350 moves axially along the sampling cylinder 310, it synchronously drives the piston block 340 in the multiple sampling chambers 320 to move synchronously.

[0034] Specifically, one end of the piston rod 350 extends through the sampling cylinder 310 to the outer surface of the sampling cylinder 310. An electric push rod 480 is installed on the support frame 140. The telescopic end of the electric push rod 480 is fixedly connected to the piston rod 350. The controller 130 controls the telescopic extension of the electric push rod 480, thereby driving the piston rod 350 to move axially along the sampling cylinder 310 to achieve the sampling function.

[0035] It is important to understand that when sampling is required, the controller 130 controls the electric push rod 480 to retract, causing the piston rod 350 to move outward, which in turn drives the piston block 340 to move within the sampling chamber 320. As the piston block 340 moves, the internal volume of the sampling chamber 320 increases, creating a negative pressure. Under this negative pressure, water enters the corresponding sampling chamber 320 through the sampling tube 330. This structure allows for simultaneous stratified sampling of different water layers at the same depth, ensuring the synchronicity and comparability of samples from different layers. Furthermore, by controlling the different extension and retraction times of the electric push rod 480, water samples from different ranges can be collected, achieving flexible sampling control.

[0036] According to the appendix Figure 2 Appendix Figure 4 To be continued Figure 8 As shown, the isolation unit 400 is located at the end of the sampling tube 330 away from the sampling cylinder 310, and is used to achieve water sample filtration and sealing to prevent leakage. The isolation unit 400 includes a connecting rod 410, a sealing plug 420, a filter cylinder 430, a guide rod 450, a locking nut 460, and a second spring 470.

[0037] A connecting rod 410 is located on one side of the sampling tube 310. Multiple sets of sealing plugs 420 corresponding to the positions of the sampling tube 330 are installed on the connecting rod 410. A filter tube 430 is installed on the sealing plug 420. The filter tube 430 is slidably connected to the inside of the sampling tube 330. Multiple sets of filter holes 440 are opened on the filter tube 430. Before the water enters the sampling tube 330, it first flows through the filter tube 430. The silt and impurities in the water are filtered through the filter holes 440 on the filter tube 430 to avoid clogging of the sampling tube 330 and at the same time ensure the quality of the water sample.

[0038] The connecting rod 410 is internally slidably connected to a guide rod 450, which is mounted on the sampling cylinder 310. A locking nut 460 is threaded onto the guide rod 450, and a second spring 470 is provided on the guide rod 450. The locking nut 460 and the guide rod 450 are threadedly connected. Through the threaded assembly connection, the connecting rod 410 can be disassembled, thereby cleaning or replacing the filter cylinder 430, which facilitates the maintenance of the equipment.

[0039] A limiting plate 490 is also installed on the piston rod 350, and the limiting plate 490 is engaged with the connecting rod 410. The limiting plate 490 serves to limit movement and prevent the connecting rod 410 from moving excessively.

[0040] It should be noted that after sampling is completed, the connecting rod 410 slides along the guide rod 450, and the second spring 470 provides elastic preload. When the controller 130 issues a reset command and the limit is released, the second spring 470 provides elastic locking force, pushing the sealing plug 420 into the port of the sampling tube 330 to seal the sampling tube 330, thereby preventing water sample leakage and cross-contamination.

[0041] Example 2: According to the appendix Figure 1 To be continued Figure 8 As shown, an intelligent sampling method for hydrological mapping includes the following steps: This intelligent sampling device uses the controller 130 as its core control unit. The boom 120 enables overall lifting and positioning of the device, the extension unit 200 adjusts the radial sampling range, the sampling unit 300 performs stratified water sampling, and the isolation unit 400 filters and seals the water samples to prevent leakage. It automates multi-point, stratified intelligent sampling of hydrological water bodies. The specific workflow is as follows: Step 1: Overall lifting and water depth positioning of the equipment.

[0042] The controller 130 issues a control command to drive the boom 120 to move, which in turn moves the connecting frame 110 and the device body 100 up and down, accurately lowering the equipment to the target water depth required for hydrological surveying and completing the spatial positioning before sampling. Multiple sets of support frames 140, which are evenly distributed in a ring outside the connecting frame 110, serve as the installation carriers for the sampling unit 300 and arrive at the designated operating water area simultaneously with the connecting frame 110.

[0043] Step 2: Adjust the sampling radial range of the extended unit.

[0044] The controller 130 starts the motor 240, and the output shaft of the motor 240 drives the threaded rod 250 on one side to rotate. The threaded rod 250 and the connecting shaft 270 are driven by gears 280 that mesh at both ends, so that the threaded rods 250 corresponding to the upper and lower bearing plates 210 rotate synchronously. The threaded sleeve 260 on the threaded rod 250 moves axially along the rod body, thereby pulling the connecting rod 230 that is hinged to it to move. The connecting rod 230 drives the movable arm 220 to swing inward / outward around the rotating shaft on the bearing plate 210.

[0045] The end of the movable arm 220 is connected to the slider 291 via a pivot. The slider 291 slides in the groove 290 of the support frame 140. The first spring 292 buffers the sliding impact and ensures smooth movement. Finally, it drives multiple sets of support frames 140 to swing synchronously around the connecting frame 110, realizing the radial adjustment of the sampling range of the sampling unit 300 and adapting to different water area mapping needs.

[0046] Step 3: Sampling unit 300 stratified synchronous sampling.

[0047] After the sampling range is adjusted, the controller 130 controls the electric push rod 480 to extend and retract, driving the piston rod 350 to move axially along the sampling cylinder 310; the piston rod 350 synchronously drives the piston blocks 340 in multiple sampling chambers 320 inside the sampling cylinder 310 to move. When the piston blocks 340 move outward, a negative pressure is formed inside the sampling chamber 320, and the water enters the corresponding chamber through the sampling tube 330, which can complete the stratified synchronous sampling of different radial and layer positions at the same water depth in one go.

[0048] In addition, by controlling the different extension and retraction timings of the electric push rod 480, water samples of different ranges can be collected.

[0049] Step 4: Isolation unit 400 filtration and sealing protection.

[0050] Before entering the sampling tube 330, the water first flows through the filter cylinder 430, where it passes through the filter holes 440 to filter out mud, sand and impurities, thus preventing the sampling tube 330 from becoming clogged.

[0051] Step 5: Sampling completed and equipment recovered.

[0052] After sampling is completed, the connecting rod 410 slides along the guide rod 450, and the second spring 470 provides elastic preload. When the limit of the connecting rod 410 is released, the second spring 470 provides elastic locking force, and the sealing plug 420 enters the port of the sampling tube 330 to seal the sampling tube 330, thus preventing water sample leakage and cross-contamination. The locking nut 460 and the guide rod 450 are threaded together. This threaded connection allows the connecting rod 410 to be disassembled, enabling the filter cartridge 430 to be cleaned or replaced.

[0053] The controller 130 controls the motor 240 to reset, the extension unit 200 drives the support frame 140 to retract, and then the boom 120 drives the device body 100 to rise and be retracted, completing a single intelligent hydrological mapping sampling operation. The boom 120 can be connected to the sampling vessel or the lifting equipment at the sampling port, or the boom 120 can be connected to a telescopic rod for manual operation.

[0054] The embodiments of this specific implementation have been described above. However, this embodiment is not limited to the specific implementation described above. The specific implementation described above is merely illustrative and not restrictive. Those skilled in the art can make many other forms based on the guidance of this embodiment, all of which are within the protection scope of this embodiment.

Claims

1. An intelligent sampling device for hydrological surveying, characterized in that, include: The device body includes a connecting frame, a lifting rod, a controller, and a support frame; The boom is mounted on the connecting frame and is used to control the vertical movement of the connecting frame; The support frame is provided in multiple sets, and the multiple sets of support frames are evenly distributed in a ring on the outside of the connecting frame; Extension unit, multiple sets of the support frame and the connecting frame are connected by extension unit; The extension unit includes a support plate installed on the upper and lower sides inside the connecting frame. Multiple sets of movable arms are evenly distributed in a ring around the two sets of support plates. The movable arms are rotatably connected to the support plates via a rotating shaft. A connecting rod is rotatably connected to the movable arm via the rotating shaft, so as to drive the movable arm to swing inward or outward through the connecting rod to adjust the position of the support frame. A sampling unit is mounted on the support frame, and the sampling range of the sampling unit can be adjusted by swinging the support frame inward or outward.

2. The intelligent sampling device for hydrological mapping according to claim 1, characterized in that, A threaded rod is provided on the side of each of the two sets of bearing plates that is far apart from each other. The two ends of the threaded rod are rotatably connected to the connecting frame and the bearing plate respectively through bearings. A threaded sleeve is threaded onto the threaded rod. The end of the connecting rod that is far away from the movable arm is rotatably connected to the threaded sleeve through a rotating shaft. A motor is installed on each of the two sets of bearing plates, and the output shaft of the motor passes through one of the bearing plates and is fixedly connected to the threaded rod.

3. The intelligent sampling device for hydrological mapping according to claim 2, characterized in that, A connecting shaft is provided between the two sets of bearing disks, and the two ends of the connecting shaft are rotatably connected to the bearing disks through bearings. Gears are installed at both ends of the threaded rod and the connecting shaft, and the two sets of gears are meshed together.

4. The intelligent sampling device for hydrological mapping according to claim 2, characterized in that, The support frame is provided with a sliding groove near the two sets of movable arms, and a slider is slidably connected inside the sliding groove. The slider is rotatably connected to the movable arm through a rotating shaft. A first spring is also provided inside the sliding groove. One end of the first spring is fixedly connected to the sliding groove, and the other end is fixedly connected to the slider.

5. The intelligent sampling device for hydrological mapping according to claim 1, characterized in that, The sampling unit includes a sampling cylinder mounted on a support frame. The sampling cylinder has multiple sampling chambers arranged from top to bottom inside. The sampling cylinder has multiple sampling tubes installed on its exterior, the same number as the sampling chambers. Each sampling tube is connected to the interior of a corresponding sampling chamber. A piston block is slidably connected inside the multiple sampling chambers. A piston rod is slidably connected inside the sampling cylinder. The piston rod passes through the multiple sampling chambers and is fixedly connected to the piston block.

6. The intelligent sampling device for hydrological mapping according to claim 5, characterized in that, An isolation unit is provided at the end of the sampling tube away from the sampling cylinder. The isolation unit includes a connecting rod disposed on one side of the sampling cylinder. Multiple sets of sealing plugs corresponding to the position of the sampling tube are installed on the connecting rod, and filter cylinders are installed on the sealing plugs.

7. The intelligent sampling device for hydrological mapping according to claim 6, characterized in that, The filter cartridge is slidably connected to the inside of the sampling tube, and the filter cartridge has multiple sets of filter holes.

8. The intelligent sampling device for hydrological mapping according to claim 6, characterized in that, The connecting rod is internally slidably connected to a guide rod, which is mounted on the sampling cylinder. A locking nut is threaded onto the guide rod, and a second spring is provided on the guide rod.

9. The intelligent sampling device for hydrological mapping according to claim 6, characterized in that, One end of the piston rod passes through the sampling cylinder and extends to the outer surface of the sampling cylinder. An electric push rod is installed on the support frame, and the telescopic end of the electric push rod is fixedly connected to the piston rod. A limit plate is also installed on the piston rod, and the limit plate and the connecting rod are engaged.

10. An intelligent sampling method for hydrological mapping, using an intelligent sampling device for hydrological mapping as described in any one of claims 1-9, characterized in that, Includes the following steps: Step 1: Overall lifting and water depth positioning of the equipment; The controller controls the boom's movement, causing the device body to rise and fall, lowering the equipment to the target water depth. Step 2: Adjust the radial sampling range; The controller drives the extension unit to move, causing multiple sets of support frames to move radially synchronously relative to the device body, which in turn causes the sampling units installed on the support frames to expand outward or retract inward, thereby adjusting the radial sampling coverage of the sampling units. Step 3: Stratified synchronous sampling; The controller controls the electric push rod to drive the piston rod to move along the axial direction of the sampling cylinder, so that multiple independent sampling chambers in the sampling cylinder generate negative pressure simultaneously, and water at different radial positions and different water depths is sucked into the corresponding sampling chambers through the sampling tube to complete the stratified synchronous sampling. Step 4: Filtration and Sealing Protection; Before entering the sampling tube, the water passes through a filter cylinder to filter impurities. After sampling is completed, the limiting plate and the connecting rod disengage simultaneously, thereby releasing the limiting position. The sealing plug automatically seals the sampling tube port under the action of the second spring to prevent water sample leakage. Step 5: Equipment recycling; The controller controls the extension unit to reset, causing the support frame to retract, and then controls the boom to lift and retract the device body.

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