High-precision water quality stratified sampling device

Abstract

The invention relates to the technical field of water quality detection, in particular to a high-precision water quality stratified sampling device which comprises a main body, a plurality of fixing plates are arranged at the top of the inner side of the main body, a plurality of mounting cabins and a control mechanism are uniformly arranged on the outer wall of the circumference of the main body, and the control mechanism is arranged between the fixing plates. The control mechanism comprises a fixing shell fixedly connected with the inner wall of the fixing plate, a speed reducer is arranged at the bottom of the fixing shell, a rope disc is rotationally connected into the fixing shell, the input end of the top end of the speed reducer is fixedly connected with the bottom of the rope disc, and the output end of the bottom of the speed reducer is fixedly connected with a butt joint rod and a sampling mechanism. High-precision stratified sampling is realized through close cooperation of the control mechanism and the sampling mechanism. The rope disc is driven by a water body to rotate and drives the butt joint rod through the speed reducer, the pressing face of the butt joint rod acts on the butt joint face of the check block, opening and closing of a water inlet of the water taking box are accurately controlled, and accurate sampling is conducted on different water layers according to needs.

Description

Technical Field

[0001] The invention relates to the technical field of water quality detection, and in particular to a high-precision water quality stratified sampling device. Background Art

[0002] In the field of water quality monitoring and research, stratified sampling of water quality at different depths of water bodies is of great significance. Traditional water quality sampling devices often have relatively single functions and it is difficult to achieve high-precision stratified sampling operations. For example, some common samplers can only perform a single sampling at a specific depth. If water samples at multiple depths are to be obtained, repeated operations are required. This not only consumes a lot of time and manpower, but also easily introduces errors during repeated operations, resulting in the accuracy and representativeness of water samples at different depths being affected.

[0003] With the deepening of water quality research, there is an increasing demand for exploring the distribution of various pollutant concentrations in different water layers, differences in biological community structure, and vertical changes in the physical and chemical properties of water quality. However, most of the existing stratified sampling devices cannot accurately control the sampling depth, the sequence and independence of sampling. In some complex water environments, such as the deep sea, large lakes, and river confluences, the water quality changes in the vertical direction are complex and diverse, and traditional devices are difficult to meet the requirements for fine stratified sampling of these special water bodies.

[0004] In addition, some existing stratified sampling devices have complex structures and are inconvenient to operate, requiring professional personnel to operate and maintain them. In addition, the equipment is expensive, which limits its application in a wider range. Summary of the invention

[0005] The present invention discloses a high-precision water quality stratified sampling device to solve the problem that the traditional water quality sampling device mentioned in the above background technology has a single function and is difficult to achieve high-precision stratified sampling operation. It can only sample once at a specific depth, and obtaining water samples at multiple depths requires repeated operations, which is time-consuming and labor-intensive and easily introduces errors, affecting the accuracy and representativeness of water samples at different depths.

[0006] In order to solve the above technical problems, a technical solution adopted by the present invention is: to provide a high-precision water quality stratified sampling device, comprising a main body, a plurality of fixing plates are arranged at the top position of the inner side of the main body, and a plurality of installation cabins are evenly opened on the circumferential outer wall of the main body;

[0007] A control mechanism, the control mechanism is arranged between the fixed plates, the control mechanism comprises a fixed shell fixedly connected to the inner wall of the fixed plate, a reducer is arranged at the bottom of the fixed shell, a rope drum is rotatably connected inside the fixed shell, an input end at the top of the reducer is fixedly connected to the bottom of the rope drum, and a docking rod is fixedly connected to the output end at the bottom of the reducer;

[0008] A sampling mechanism is slidably installed inside the installation cabin, and the sampling mechanism includes a water intake box slidably connected to the inner wall of the installation cabin, a water inlet is penetrated through the top of the water intake box, a mounting shell 1 is fixedly connected at a position near the water inlet on the top of the water intake box, a stopper is slidably connected inside the mounting shell 1, and a support spring with a bottom end connected to the inner wall of the installation cabin is provided at the bottom of the water intake box.

[0009] The present invention is further configured such that a rope outlet is provided through the top of the fixed shell, a fixed shell 2 is fixedly connected to the top of the fixed shell near the rope outlet, a clamp is provided through the bottom of the fixed shell 2 corresponding to the rope outlet, a clamp is slidably connected to the inside of the clamp, and a telescopic rod with one end connected to the inner wall of the fixed shell 2 is provided on the side of the clamp away from the clamp.

[0010] The present invention is further configured such that a suspension rod is provided at the center position of the top of the fixed shell, and a pressure surface is provided at one end of the docking rod away from the reducer.

[0011] The present invention is further configured such that a decompression channel is provided through the center of the main body, and a docking frame is provided in the decompression channel near the docking rod.

[0012] The present invention is further configured such that a filter screen is provided inside the water inlet, and a sewage outlet is provided on an outer wall of the installation shell near the water inlet.

[0013] The present invention is further configured such that a spring one whose end is connected to the mounting shell one is provided on one side of the stopper located inside the mounting shell one, and a docking surface is provided on one side of the stopper located outside the mounting shell one.

[0014] The present invention is further configured such that a drainage hole is provided at a position on the bottom of the main body corresponding to the installation cabin, and the drainage hole is communicated with the installation cabin.

[0015] Beneficial effects of a high-precision water quality stratified sampling device of the present invention:

[0016] 1. High-precision stratified sampling is achieved through close cooperation between the control mechanism and the sampling mechanism. The rope disc in the control mechanism is driven by the water body to rotate when the device sinks, and drives the docking rod to rotate after being decelerated and adjusted by the reducer. The pressure surface of the docking rod interacts with the docking surface of the block in the sampling mechanism to accurately control the opening and closing of the water inlet of the water tank, so that the water tank can be opened in different water layers as needed to collect water samples, meeting the requirements of fine stratified sampling in the vertical direction of complex water bodies, and effectively solving the problem that traditional devices are difficult to accurately control the sampling depth and sampling sequence and independence.

[0017] 2. Different from the traditional method of only sampling once at a specific depth and repeating the operation multiple times to obtain water samples at multiple depths, this device can be lowered once to control multiple water tanks to work in sequence according to different water layers, avoiding the errors introduced by repeated operations, greatly saving time and labor costs, ensuring the accuracy and representativeness of water samples at different depths, and meeting the needs of water quality research for high precision of multiple samples.

[0018] 3. The decompression channel effectively reduces the water resistance when the device is launched, which is conducive to the stable sinking of the device to the target water layer. The drainage hole is convenient for draining the water in the installation cabin when the device rises, ensuring the easy recovery of the device. The telescopic rod in the fixed shell 2 cooperates with the clamping plate to flexibly clamp or release the rope according to the state of the docking rod, accurately control the device's stay sampling in each water layer, and combine with the sensor in the reducer to monitor the movement state of the docking rod to realize automatic process control, making the entire sampling process efficient and orderly.

[0019] 4. The water inlet of the sampling mechanism is equipped with a filter to prevent foreign matter from entering the water tank. After the docking rod is separated from the block, the spring pushes the block to reset, which can clean the foreign matter accumulated on the filter, maintain smooth water inlet, extend the service life of the device, ensure the purity of the sampled water, and improve the reliability of the test data.

[0020] 5. The water tank uses its own buoyancy and the bottom support spring to form a reasonable mechanical balance in the water. When entering the water, the buoyancy and spring force make the water tank float to the top of the installation cabin. When sampling water, as the water fills and the gravity increases, the bucket slowly sinks to compress the support spring until the sampling process is completed. This mechanism ensures that the water tank works stably at each stage, adapts to the changes in water pressure and buoyancy at different depths, and assists in the smooth implementation of precise stratified sampling. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, a detailed description is given below in conjunction with the accompanying drawings.

[0022] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0023] Figure 1 A three-dimensional structural diagram of a high-precision water quality stratified sampling device of the present invention;

[0024] Figure 2 An exploded view of a high-precision water quality stratified sampling device of the present invention;

[0025] Figure 3 A cross-sectional view of a high-precision water quality stratified sampling device of the present invention;

[0026] Figure 4 A cross-sectional view of a control mechanism of a high-precision water quality stratified sampling device of the present invention;

[0027] Figure 5 This is an exploded diagram of the sampling mechanism of a high-precision water quality stratified sampling device of the present invention.

[0028] The markings in the figure are:

[0029] 1. Main body; 11. Fixing plate; 12. Installation cabin; 13. Drain hole; 14. Decompression channel;

[0030] 15. Sampling mechanism; 151. Water collection tank; 152. Support spring; 153. Water inlet; 1531. Filter screen; 154. Mounting shell 1; 1541. Drain outlet; 155. Stopper; 1551. Docking surface; 156. Spring 1;

[0031] 16. Control mechanism; 161. Fixed shell; 162. Rope drum; 163. Speed ​​reducer; 164. Docking rod; 1641. Pressing surface; 165. Rope outlet; 166. Fixed shell II; 1661. Telescopic rod; 1662. Clamp; 1663. Clamp; 167. Suspension rod. DETAILED DESCRIPTION

[0032] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other; the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left" and "right" etc. indicate directions or positional relationships based on directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the positions or elements referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limitations of the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. In addition, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense, for example, "connection" can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or a transmission connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements.

[0034] See also Figure 1-Figure 5 A high-precision water quality stratified sampling device comprises a main body 1, a plurality of fixing plates 11 are arranged at the top of the inner side of the main body 1, and a plurality of installation chambers 12 are evenly opened on the outer wall of the main body 1;

[0035] The control mechanism 16 is arranged between the fixed plates 11. The control mechanism 16 comprises a fixed shell 161 fixedly connected to the inner wall of the fixed plate 11. A reducer 163 is arranged at the bottom of the fixed shell 161. A rope drum 162 is rotatably connected inside the fixed shell 161. The input end at the top of the reducer 163 is fixedly connected to the bottom of the rope drum 162. The output end at the bottom of the reducer 163 is fixedly connected to a docking rod 164.

[0036] The sampling mechanism 15 is slidably installed inside the installation cabin 12. The sampling mechanism 15 includes a water intake box 151 slidably connected to the inner wall of the installation cabin 12. A water inlet 153 is provided through the top of the water intake box 151. A mounting shell 154 is fixedly connected to the top of the water intake box 151 near the water inlet 153. A stopper 155 is slidably connected inside the mounting shell 154. A support spring 152 is provided at the bottom of the water intake box 151, and the bottom end of the support spring 152 is connected to the inner wall of the installation cabin 12.

[0037] By adopting the above technical solution, the main body 1 is the basic structure of the device, the fixed plate 11 on the inner top firmly carries the control mechanism 16, and the installation cabin 12 on the circumferential outer wall is used for the sliding installation of the sampling mechanism 15 to ensure the orderly operation of each component. In the control mechanism 16, the fixed shell 161 is connected to the fixed plate 11, and the internal rope disk 162 rotates and is dragged by water. The speed is adjusted by the bottom reducer 163, driving the docking rod 164 to rotate and control the sampling, and the top rope outlet 165 cooperates with the fixed shell 166 and the telescopic rod 1661 and the clamp 1663 to realize the rope fixation and control the sampling process. The water intake tank 151 of the sampling mechanism 15 adjusts its position in the installation cabin 12 according to the buoyancy and support spring 152, and the water inlet 153 is controlled to open and close by the block 155, and the filter net 1531 is used to prevent foreign objects. The spring 156 helps the block 155 to reset the cleaning net to ensure accurate stratified sampling.

[0038] A rope outlet 165 is formed through the top of the fixed shell 161, and a second fixed shell 166 is fixedly connected to the top of the fixed shell 161 near the rope outlet 165. A clamping opening 1662 is formed through the bottom of the second fixed shell 166 corresponding to the rope outlet 165, and a clamping plate 1663 is slidably connected inside the clamping opening 1662. A telescopic rod 1661 with one end connected to the inner wall of the second fixed shell 166 is provided on the side of the clamping plate 1663 away from the clamping opening 1662.

[0039] By adopting the above technical solution, the rope outlet 165 at the top of the fixed shell 161 is used for the rope to pass through so as to be connected and fixed to the outside, thereby ensuring that the device sinks in the water and the sampling process proceeds smoothly. A fixed shell 166 is provided near the rope outlet 165, and its bottom clamp 1662 and the internal sliding clamp 1663 cooperate with the telescopic rod 1661 whose one end is connected to the inner wall of the fixed shell 166 to play a role at the key node of the device sampling. When the docking rod 164 touches the block 155 to a specific state, the sensor of the reducer 163 triggers the telescopic rod 1661 to push the clamp 1663 to clamp the rope, so as to stabilize the sinking of the device. After the sampling is completed, the clamp 1663 can be pulled back to loosen the rope and continue the layered sampling process.

[0040] A suspension rod 167 is disposed at the top center of the fixed shell 161 , a pressing surface 1641 is disposed at one end of the docking rod 164 away from the reducer 163 , and a docking surface 1551 is disposed on one side of the stopper 155 located outside the mounting shell 154 .

[0041] By adopting the above technical solution, the suspension rod 167 at the top center of the fixed shell 161 is the key part for connecting the lifting rope, by which the device can be stably placed in the water to start the sampling process. The pressure surface 1641 of the docking rod 164 at one end away from the reducer 163 is specially designed to cooperate with the docking surface 1551 of the stopper 155. When the device sinks, the docking rod 164 rotates, and the pressure surface 1641 squeezes the docking surface 1551 of the stopper 155, pushing the stopper 155 to move, opening the water inlet 153 of the water collection tank 151 to collect water samples, and the two can be stuck and fixed to control the sampling rhythm.

[0042] A filter screen 1531 is provided inside the water inlet 153, a sewage outlet 1541 is provided on the outer wall of the installation shell 154 near the water inlet 153, and a spring 156 is provided on one side of the stopper 155 located inside the installation shell 154, one end of which is connected to the installation shell 154.

[0043] By adopting the above technical solution, the filter 1531 in the water inlet 153 can effectively block the entry of impurities and foreign matter in the water when the water tank 151 collects water samples, thereby ensuring the purity of the water samples and facilitating the subsequent accurate water quality testing. The sewage outlet 1541 on the outer wall of the installation shell 154 near the water inlet 153 is convenient for discharging the debris when the block 155 is reset to clean the accumulated foreign matter on the filter 1531, thereby maintaining a good sampling state of the device. The spring 156 of the block 155 located inside the installation shell 154 can timely push the block 155 to reset after the docking rod 164 is separated from the block 155, thereby closing the water inlet 153 to end the current sampling and cleaning the filter 1531 to prepare for the next sampling.

[0044] A decompression channel 14 is provided through the center of the main body 1 , a docking frame is provided inside the decompression channel 14 near the docking rod 164 , a drainage hole 13 is provided at the bottom of the main body 1 corresponding to the installation cabin 12 , and the drainage hole 13 is connected to the installation cabin 12 .

[0045] By adopting the above technical solution, the decompression channel 14 of the main body 1 runs through the inner center thereof. When launching, the internal docking frame fits with the bottom of the docking rod 164, helping the docking rod 164 to rotate smoothly, reducing water resistance and ensuring that the device sinks smoothly to the target water layer. The drainage hole 13 corresponding to the installation cabin 12 at the bottom of the main body 1 is connected to the installation cabin 12. When the device rises, the water accumulated in the installation cabin 12 is efficiently drained, reducing the weight of the device and making the recovery process convenient. The two cooperate to optimize the launching and recovery process of the device.

[0046] The working principle and use process of the embodiment of the present invention are as follows:

[0047] The decompression channel 14 is used to reduce the resistance of water when the device is launched into the water. The drainage hole 13 is convenient for draining the water in the installation cabin 12 when the device rises. The docking frame inside the decompression channel 14 is in contact with the bottom of the docking rod 164 to maintain the smooth rotation of the docking rod 164. The hoisting rod 167 is used to connect the connecting rope for hoisting the device. The rope drum 162 is used to place the coiled rope. One end of the rope extends to the outside of the control mechanism 16 through the rope outlet 165 clamping mouth 1662. At the same time, one end of the rope must be connected to something for fixation. The telescopic rod 1661 in the fixed shell 166 is used to push the splint 1663, and the rope is clamped and fixed by pushing the splint 1663 to move.

[0048] When in use, the device is placed in water by hoisting. When the device sinks in the water, it is driven by the rope drum 162 to rotate because of the telescopic fixation. When the rope drum 162 rotates, it will drive the input end of the reducer 163 to rotate, and the rotating speed will be transmitted to the reducer 163 for deceleration and output through the output end, thereby driving the docking rod 164 to rotate clockwise and move toward the stopper 155. The pressing surface 1641 of the docking rod 164 will contact the docking surface 1551 of the stopper 155, and the docking surface 1551 is squeezed by the pressing surface 1641, so that the stopper 155 moves toward the inside of the installation shell 154 to expose the water inlet 153 for water source collection. When the water inlet 153 is exposed, the pressing surface 1641 will be stuck together with the docking surface 1551, so that the docking rod 164 cannot move. The reducer 163 is provided with a sensor. When the sensor senses that the docking rod 164 cannot move, the telescopic rod 1661 will push the clamping plate 1663 to clamp the rope and prevent the device from sinking.

[0049] After the device stays in place, the water intake box 151 with the water inlet 153 exposed will collect the current water layer. When the water intake box 151 is submerged in water, the bucket will be subject to upward buoyancy in the water due to its own buoyancy. At the same time, the support spring 152 at the bottom will also generate an upward elastic force on the bucket. The combined force of these two forces makes the bucket float upward and finally stay on the top of the installation cabin 12. At this time, the buoyancy is greater than or equal to the sum of the gravity of the bucket and the spring elastic force, reaching a state of equilibrium. When the bucket begins to take in water, the gravity of the bucket gradually increases. According to the buoyancy formula, the increase in gravity due to the water slowly filling the water intake box 151 will cause the bucket to sink slowly due to gravity, and the pressure on the support spring 152 will gradually increase. The support spring 152 is slowly compressed until the block 155 falls and separates from the docking rod 164.

[0050] When the docking rod 164 is not blocked and the rear sensor is not blocked, the telescopic rod 1661 will pull the clamp 1663 to loosen the clamp on the rope and continue to repeat the above steps. Different water tanks 151 are opened to collect water sources according to different water layers. The filter screen 1531 in the water inlet 153 is used to prevent foreign matter from entering the water tank 151. After the docking rod 164 is separated from the block 155, the spring 156 will push the block 155 to reset. When the block 155 is reset, the foreign matter accumulated on the filter screen 1531 will be cleaned. By adjusting the transmission speed of the reducer 163, the water tank 151 can be controlled to open and collect water sources in water layers of different depths.

[0051] In summary, compared with the prior art, the embodiments of the present invention have the following advantages:

[0052] Advantage 1: The present invention breaks through the traditional limitations through the coordinated operation of the uniquely designed control mechanism 16 and the sampling mechanism 15. In the control mechanism 16, the rope drum 162 rotates with the sinking of the device driven by the water body, and its rotation is transmitted to the docking rod 164 after precise speed regulation by the reducer 163. The pressure surface 1641 of the docking rod 164 and the docking surface 1551 of the block 155 on the water tank 151 in the sampling mechanism 15 precisely fit and interact. This close connection can trigger the water inlet 153 of the water tank 151 to open in order according to the preset different water layers, collect water samples from each layer one by one, avoid the errors caused by the traditional repeated operation of a single sampler, efficiently and accurately meet the needs of vertical multi-depth fine sampling of complex water bodies, and solve the problem that the existing stratified sampling device is difficult to control the sampling depth, sampling sequence and independence.

[0053] Advantage 2: The main body 1 is provided with a decompression channel 14 and a drainage hole 13, which complement each other. The decompression channel 14 plays a key role in the sinking stage of the device. Its internal docking frame assists the docking rod 164 to rotate smoothly, while effectively reducing the water resistance, ensuring that the device reaches the target water layer smoothly and quickly; and the drainage hole 13 is very useful when the device rises, timely draining the accumulated water in the installation cabin 12, reducing the weight of the device, making the recovery process convenient and efficient. The overall structural design meets the needs of the entire process operation, which is superior to traditional devices with a single structure and function.

[0054] Advantage 3: The reducer 163 has a built-in sensor, which forms an intelligent linkage mechanism with the telescopic rod 1661 and the clamping plate 1663 in the fixed shell 166. When the docking rod 164 touches the block 155 and gets stuck in the corresponding water layer according to the process, the sensor immediately captures the signal, prompting the telescopic rod 1661 to push the clamping plate 1663 to clamp the rope, and stabilize the device to stay for sampling; after the sampling is completed, the docking rod 164 is separated from the block 155, and the sensor sends a command to release the clamping plate 1663, and the device continues to sink. The whole process is automated and intelligently controlled in speed and position, easy to operate, and does not require complex debugging by professionals, overcoming the disadvantages of traditional complex equipment that is cumbersome to operate and requires special maintenance.

[0055] Advantage 4: In the sampling mechanism 15, the water inlet 153 is equipped with a filter 1531, which is like a solid defense line to prevent foreign matter in the water from mixing into the water tank 151, ensuring the purity of the water sample and improving the accuracy of water quality detection. What is more ingenious is that when the sampling of the water tank 151 is completed and the docking rod 164 is separated from the stopper 155, the spring 156 pushes the stopper 155 to reset, cleverly cleaning the foreign matter accumulated in the filter 1531, maintaining its long-term filtering efficiency, and continuously protecting the quality of the water sample. This self-cleaning protection feature is a rare advantage of traditional sampling devices.

[0056] Advantage 5: The support spring 152 at the bottom of the water tank 151 cooperates well with its own buoyancy. When entering the water for the first time, the buoyancy and the support spring 152 work together to lift the water tank 151 to the top of the installation cabin 12, maintaining a stable initial state; when sampling, as water is injected, the gravity of the water tank 151 gradually increases, breaking the balance and starting to sink, and the support spring 152 buffers and adapts as needed until the sampling is completed. The water tank 151 is stabilized and controlled throughout the process according to the dynamic changes of buoyancy, gravity, and elastic force, responding to the differences in water pressure and buoyancy of different water layers, and assisting in precise stratified sampling, which is beyond the reach of traditional devices that lack such fine mechanical design.

[0057] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high-precision water quality stratified sampling device, characterized in that: include: A main body (1), wherein a plurality of fixing plates (11) are arranged at the top of the inner side of the main body (1), and a plurality of installation compartments (12) are evenly arranged on the circumferential outer wall of the main body (1); A control mechanism (16), the control mechanism (16) being arranged between the fixed plates (11), the control mechanism (16) comprising a fixed shell (161) fixedly connected to the inner wall of the fixed plate (11), a reducer (163) being arranged at the bottom of the fixed shell (161), a rope drum (162) being rotatably connected inside the fixed shell (161), an input end at the top of the reducer (163) being fixedly connected to the bottom of the rope drum (162), and a docking rod (164) being fixedly connected to the output end at the bottom of the reducer (163); A sampling mechanism (15), wherein the sampling mechanism (15) is slidably installed inside the installation cabin (12), and the sampling mechanism (15) comprises a water intake box (151) slidably connected to the inner wall of the installation cabin (12), a water inlet (153) is provided through the top of the water intake box (151), a mounting shell (154) is fixedly connected to the top of the water intake box (151) near the water inlet (153), a stopper (155) is slidably connected inside the mounting shell (154), and a support spring (152) is provided at the bottom of the water intake box (151), the bottom end of which is connected to the inner wall of the installation cabin (12).

2. A high-precision water quality stratified sampling device according to claim 1, characterized in that: The top of the fixed shell (161) is provided with a rope outlet (165), and a second fixed shell (166) is fixedly connected to the top of the fixed shell (161) near the rope outlet (165). The bottom of the second fixed shell (166) is provided with a clamping opening (1662) corresponding to the rope outlet (165), and a clamping plate (1663) is slidably connected inside the clamping opening (1662). A telescopic rod (1661) with one end connected to the inner wall of the second fixed shell (166) is provided on a side of the clamping plate (1663) away from the clamping opening (1662).

3. A high-precision water quality stratified sampling device according to claim 2, characterized in that: A suspension rod (167) is provided at the center position of the top of the fixed shell (161), and a pressing surface (1641) is provided at one end of the docking rod (164) away from the reducer (163).

4. A high-precision water quality stratified sampling device according to claim 1, characterized in that: A decompression channel (14) is provided through the center of the main body (1), and a docking frame is provided in the decompression channel (14) near the docking rod (164).

5. A high-precision water quality stratified sampling device according to claim 1, characterized in that: A filter screen (1531) is disposed inside the water inlet (153), and a sewage outlet (1541) is provided on the outer wall of the first installation shell (154) near the water inlet (153).

6. A high-precision water quality stratified sampling device according to claim 1, characterized in that: A spring (156) having one end connected to the mounting shell (154) is disposed on one side of the stopper (155) located inside the mounting shell (154), and a docking surface (1551) is provided on one side of the stopper (155) located outside the mounting shell (154).

7. A high-precision water quality stratified sampling device according to claim 1, characterized in that: A drainage hole (13) is provided at a position of the bottom of the main body (1) corresponding to the installation chamber (12), and the drainage hole (13) is connected to the installation chamber (12).

Images