A seawater sampling device

Abstract

The application discloses a seawater sampling device, which comprises a barrel, a water inlet device and a counterweight. The water inlet device is arranged on the top of the barrel. The top of the barrel is provided with a handle, and the handle is connected with a sub rope. One end of the sub rope is provided with a movable thimble for movably sleeving with a main rope for seawater sampling. The water inlet device comprises a valve body and a driving device. The driving device comprises a movable rod and a spring. One end of the movable rod extends upward to the outside of the barrel and is connected with the sub rope. When the sampling barrel is dived to a predetermined depth along the main rope, the upward force of the sub rope pulls the water inlet device upward to trigger the water inlet device to open. The application can avoid the entanglement of the sampling barrel and the main rope. When the main rope is pulled upward, the sub rope can trigger the water inlet device to open the water inlet, so that the water inlet can be automatically controlled when the sampling barrel reaches the predetermined depth, without the need of setting up an electric control and wiring, which greatly simplifies the water inlet control structure and improves the water inlet control stability.

Description

Technical Field

[0001] This application relates to the field of seawater physicochemical testing, and in particular to a seawater sampling device. Background Technology

[0002] Seawater is rich in minerals, making it a veritable liquid mineral deposit. To understand its properties, physicochemical testing is essential. Furthermore, seawater harbors numerous marine microorganisms, some of which are pathogenic. Current research on marine pathogens is limited, resulting in a lack of evidence for treating marine microbial diseases. Therefore, to study pathogens in seawater, it is necessary to collect seawater samples from different depths for testing. Moreover, the water quality varies significantly across different regions and depths, making seawater samplers indispensable for physicochemical testing. Existing seawater sampling methods mainly consist of a main rope and a sampling tube connected to the main rope, and can only sample seawater at a specific depth. To accurately collect seawater at the predetermined depth, the sampling tube's inlet device requires a complex control valve, with the valve's wire extending along the main rope to the sea surface and connecting to a controller. Long wires are not only prone to breakage but also susceptible to control failure due to their excessive length. Therefore, how to quickly and conveniently collect seawater at a predetermined depth has become a pressing technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0003] In view of the above problems, this application provides a seawater sampling device to solve the technical problem of inconvenience in collecting and detecting seawater at a predetermined depth.

[0004] To achieve the above objectives, the inventors provide a seawater sampling device, comprising: a cylinder, a water inlet device, and a counterweight; the water inlet device is disposed at the top of the cylinder;

[0005] The top of the cylinder is provided with a handle, and a sub-rope is connected to the handle. One end of the sub-rope is provided with a movable collar, which is used to movably connect with the main rope for seawater sampling, so that the cylinder can descend along the main rope under the action of the counterweight.

[0006] The water inlet device includes a valve body and a drive device; the valve body includes a valve cavity and a diaphragm assembly, the diaphragm assembly being disposed within the valve cavity, and the diaphragm assembly being movable within the valve cavity to open or close the valve body; the drive device includes a movable rod and a spring, the movable rod abutting against the spring, one end of the movable rod extending upward to the outer cylinder and connected to the sub-rope, the spring being used to apply a spring force to the movable rod pointing towards the diaphragm assembly; the sub-rope drives the movable rod away from the diaphragm assembly to open the valve body;

[0007] When the sampling tube descends to a predetermined depth along the main rope, the sub-rope generates an upward force, causing the sub-rope to pull the water inlet device upward, thereby triggering the water inlet device to open.

[0008] Furthermore, the water inlet device includes a water inlet, a water inlet channel, and a water outlet arranged sequentially;

[0009] The water inlet channel is an annular channel with a cavity in the middle, and the driving device is disposed in the cavity.

[0010] Furthermore, the water inlet device is a bistable water inlet device.

[0011] Furthermore, a one-way valve is also installed in the water inlet channel of the water inlet device.

[0012] Furthermore, the handle is a U-shaped handle, with both ends of the handle hinged to the two sides of the top of the cylinder, allowing the handle to swing relative to the cylinder.

[0013] Furthermore, the sub-rope includes a first sub-rope and a second sub-rope, one end of the first sub-rope is connected to the movable collar, the other end of the first sub-rope is connected to the handle, one end of the second sub-rope is connected to the handle, and the other end of the second sub-rope is connected to the movable rod;

[0014] When the first sub-rope is lifted and the middle of the handle is moved away from the cylinder, the second sub-rope becomes taut and pulls the movable rod upward to trigger the water inlet device to open the water inlet.

[0015] Furthermore, the main rope is equipped with depth markings.

[0016] Furthermore, the cylinder is made of stainless steel, and the sub-rope is made of PE wire.

[0017] Furthermore, the counterweight is connected to the cylinder via another sub-rope.

[0018] Furthermore, the main rope is a circular steel cable; the inner wall of the movable collar is provided with a plurality of ball bearings that roll in contact with the steel cable.

[0019] Unlike existing technologies, the seawater sampling device described above includes a cylinder, a water inlet device, and a counterweight. The water inlet device is located at the top of the cylinder. The sampling cylinder is slidably connected to the main rope via a movable collar. The main rope first descends into the seawater via the counterweight, and then the sampling cylinder descends to a predetermined depth via the counterweight and the movable collar. The sampling cylinder is equipped with a water inlet device connected to a sub-rope, which triggers the water inlet. When the sampling cylinder descends to the predetermined depth along the main rope, the movable collar exerts an upward force on the sub-rope, causing the sub-rope to pull the water inlet device upward, thus triggering its activation. Therefore, the sampling cylinder can quickly descend to the predetermined depth along the main rope, and water inlet can be automatically controlled when the sampling cylinder reaches the predetermined depth. This eliminates the need for water inlet electrical control and wiring, greatly simplifying the water inlet control structure and improving its stability.

[0020] The above description of the invention is merely an overview of the technical solution of this application. In order to enable those skilled in the art to better understand the technical solution of this application and to implement it based on the description and drawings, and to make the above-mentioned objectives and other objectives, features and advantages of this application easier to understand, the following description is provided in conjunction with the specific embodiments and drawings of this application. Attached Figure Description

[0021] The accompanying drawings are only used to illustrate the principles, implementation methods, applications, features, and effects of specific embodiments of the present invention and other related contents, and should not be considered as limitations on this application.

[0022] In the accompanying drawings of the instruction manual:

[0023] Figure 1 This is a schematic diagram of the seawater sampling device described in a specific embodiment;

[0024] Figure 2 This is a schematic diagram illustrating the usage state of the seawater sampling device described in the specific implementation method;

[0025] Figure 3 This is a schematic diagram of the boom structure described in the specific implementation method;

[0026] Figure 4 for Figure 2 A magnified view of part A in the middle;

[0027] Figure 5 This is a cross-sectional view of the water inlet device described in the specific embodiment;

[0028] Figure 6 This is a schematic diagram of the valve body described in a specific embodiment;

[0029] Figure 7The exploded view of the valve body according to the specific embodiment is shown below; the reference numerals in the above figures are explained as follows: 1. Main rope;

[0030] 11. Counterweight;

[0031] 13. Conical limiting block;

[0032] 14. Activity ring toss;

[0033] 2. Sampling tube;

[0034] 20. Cylinder body;

[0035] 21. Sub-rope;

[0036] 22. Counterweight;

[0037] 23. Water inlet device;

[0038] 24. Handle;

[0039] 25. The second rope;

[0040] 231. Shell;

[0041] 2311. Water inlet;

[0042] 2312. Water outlet;

[0043] 2313. Water inlet channel;

[0044] 230. Valve body;

[0045] 2301, Top cover;

[0046] 2302, Main Body;

[0047] 2303, Movable lever;

[0048] 2304. Upper valve body;

[0049] 2305, diaphragm;

[0050] 2306. Lower valve body;

[0051] 2307, Spring;

[0052] 3. Boat;

[0053] 31. Multi-stage telescopic boom;

[0054] 32. Pulley;

[0055] 33. Control cabinet;

[0056] 34. Telescopic hydraulic cylinder;

[0057] 35. Winding drum; Detailed Implementation

[0058] To illustrate the possible application scenarios, technical principles, implementable specific solutions, and achievable objectives and effects of this application in detail, the following description, in conjunction with the listed specific embodiments and accompanying drawings, provides a detailed explanation. The embodiments described herein are merely illustrative of the technical solutions of this application and are therefore intended to limit the scope of protection of this application.

[0059] In this document, the term "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The term "embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment, nor does it specifically limit its independence or connection with other embodiments. In principle, in this application, as long as there are no technical contradictions or conflicts, the technical features mentioned in each embodiment can be combined in any way to form corresponding implementable technical solutions.

[0060] Unless otherwise defined, the technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the use of related terms herein is merely for the purpose of describing particular embodiments and is not intended to limit this application.

[0061] In the description of this application, the term "and / or" is used to describe the logical relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A exists, B exists, and A and B exist simultaneously. Additionally, the character " / " in this document generally indicates that the preceding and following objects have an "or" logical relationship.

[0062] In this application, terms such as “first” and “second” are used only to distinguish one entity or operation from another, and do not necessarily require or imply any actual quantity, hierarchy or order relationship between these entities or operations.

[0063] Without further limitations, the use of terms such as “comprising,” “including,” “having,” or other similar open-ended expressions in this application is intended to cover non-exclusive inclusion, which does not exclude the presence of additional elements in a process, method, or product that includes the stated elements, such that a process, method, or product that includes a list of elements may include not only those defined elements but also other elements not expressly listed, or elements inherent to such a process, method, or product.

[0064] Similar to the understanding in the Examination Guidelines, in this application, expressions such as "greater than," "less than," and "exceeding" are understood to exclude the stated number; expressions such as "above," "below," and "within" are understood to include the stated number. Furthermore, in the description of the embodiments in this application, "multiple" means two or more (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups" and "multiple times," unless otherwise explicitly specified.

[0065] In the description of the embodiments of this application, the space-related expressions used, such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "vertical," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," indicate the orientation or positional relationship based on the orientation or positional relationship shown in the specific embodiments or drawings. They are only for the purpose of describing the specific embodiments of this application or for the reader's understanding, and do not indicate or imply that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0066] Unless otherwise expressly specified or limited, the terms "installation," "connection," "linking," "fixing," and "setting," as used in the description of the embodiments of this application, should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two components or the interaction between two components. For those skilled in the art to which this application pertains, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0067] Please see Figures 1 to 7 This embodiment provides a seawater sampling device. This device can sample seawater at different depths, and automatically triggers water intake when the sampling tube descends to a predetermined depth. This seawater sampling device can be used in conjunction with a seawater testing device. The seawater testing device is used to perform physicochemical tests on the seawater sampled by the sampling device. The physicochemical tests include any one or a combination of two or more of the following: pH, color, conductivity, total hardness, suspended solids, dissolved oxygen, chemical oxygen demand (COD), biochemical oxygen demand (BOD), ammonia nitrogen, cyanide, volatile phenols, petroleum hydrocarbons and animal / vegetable oils, sulfides, chlorides, fluorides, sulfate, and nitrates. In other words, the seawater sampling device includes a pH meter, a conductivity meter, or other testing devices.

[0068] like Figure 1As shown, the seawater sampling device includes a cylinder 20, a water inlet device 23, and a counterweight 22; the water inlet device 23 is located at the top of the cylinder 20. The sampling cylinder 2 is slidably mounted on the main rope 1 along the main rope to descend to a predetermined depth along the sub-rope to collect seawater. The cylinder 20 has a cylindrical structure and may be made of stainless steel. The cylinder 20 has an internal cavity for containing seawater, and a handle 24 is also provided at the top of the cylinder 20. The top of the cylinder is connected to the main rope 1 via a sub-rope 21 and a movable collar 14. A counterweight 22 is provided at the bottom of the cylinder, and the weight of the counterweight 22 drives the sampling cylinder to slide down the main rope to a predetermined depth. The sub-rope 21 includes a first sub-rope and a second sub-rope. The first sub-rope is connected to the handle 24, and the handle 24 is then connected to the water inlet device 23 via the second sub-rope. To facilitate the emptying of seawater from the sampling tube, a water outlet is provided at the bottom of the sampling tube or at another location, and a water outlet valve is installed on the water outlet. The counterweight 22 can be connected to the bottom of the sampling tube via another sub-rope.

[0069] like Figure 1 and Figure 4 As shown, the sub-rope 21 is slidably connected to the main rope 1 via a movable collar 14. A conical limiting block 13, corresponding to the sub-rope 21, is provided at a predetermined depth on the main rope 1. The maximum outer diameter of the conical limiting block 13 is larger than the inner diameter of the movable collar 14, so that the movable collar 14 can abut against the conical limiting block 13 when the sampling cylinder descends. In some embodiments, to reduce water resistance and ensure the tensile strength of the sub-rope, the sub-rope 21 and the main rope 1 are made of PE thread.

[0070] like Figure 1 and Figure 2 As shown, the seawater sampling device is suspended by a crane on the ship to collect seawater samples.

[0071] The crane on vessel 3 suspends a main rope 1, the end of which is connected to a counterweight 11. The counterweight 11 lowers the main rope into the seawater and keeps it taut. Figure 2 As shown, the boom includes: a multi-stage telescopic boom 31, a telescopic cylinder 34, a pulley 32, a winding drum 35, and a control cabinet 33. The telescopic cylinder 34 is connected to the multi-stage telescopic boom 31 and is used to control the extension and retraction of the multi-stage telescopic boom; the pulley 32 is located at the end of the multi-stage telescopic boom 31, and the main rope 1 is connected to the winding drum 35 after passing through the pulley 32. The rotation of the winding drum 35 drives the main rope 1 to rise and fall in seawater. In some embodiments, to expand the working range of the boom, the boom also includes a slewing device, which is located at the bottom of the multi-stage telescopic boom and is used to drive the multi-stage telescopic boom to rotate horizontally.

[0072] like Figure 2As shown, the counterweight 11 is connected to the tail of the main rope 1, and the other end of the main rope 1 is connected to the boom. The counterweight 11 can be made of high-density metals or alloys such as lead or tungsten steel to allow the main rope 1 to submerge. In some embodiments, the main rope 1 is provided with depth markings to facilitate depth adjustment.

[0073] During sampling, the main rope 1, under the action of the counterweight 11, first sinks into the seawater, with the bottom of the main rope 1 greater than or equal to the predetermined depth for seawater sampling. After the main rope 1 sinks and straightens, the sampling cylinder 2, under the action of the counterweight, descends along the main rope. Figure 4 As shown, when the sampling tube 2 descends to a predetermined depth along the main rope 1, the movable collar 14 and the conical limiting block 13 abut against each other, generating an upward force on the sub-rope. This force causes the sub-rope to pull the water inlet device upward, thereby triggering the water inlet device to open.

[0074] In this embodiment, when the counterweight 11 descends to the predetermined depth, the main rope 1 is straightened, thereby facilitating the rapid descent of the sampling cylinder 2 along the main rope under the action of the counterweight. This reduces the descent resistance of the sampling cylinder, allowing it to descend quickly to the predetermined depth and preventing the sampling cylinder 2 from becoming entangled or knotted with the main rope.

[0075] In some embodiments, in order to reduce the frictional resistance between the movable collar and the main rope, the main rope 1 is a circular steel cable; the inner wall of the movable collar 14 is provided with a plurality of ball bearings that roll in contact with the steel cable.

[0076] like Figure 5 The figure shown is a cross-sectional view of the water inlet device 23 in the above embodiment. In some technical solutions, the water inlet device 23 includes a housing 231 and a valve body 230 disposed within the housing 231. The valve body 230 is connected to a drive device, which is used to drive the valve body 230 to open or close.

[0077] The housing 231 includes an inlet 2311, an outlet 2312, and an inlet channel 2313 connecting the inlet 2311 and the outlet 2312. The outlet 2312 is located inside the cylinder 20. During seawater sampling, the seawater enters the cylinder 20 sequentially through the inlet 2311, the inlet channel 2313, and the outlet 2312. The inlet channel 2313 can surround the outside of the valve body 230, meaning the inlet channel 2313 is integrally connected around the outside of the valve body 230 at a 360° angle. In the above embodiment, the valve body 230 is located inside the housing of the sensing water outlet device, and the inlet channel 2313 is arranged along the outside of the valve body 230, thereby greatly reducing the volume of the water inlet device.

[0078] like Figure 6 and Figure 7As shown, the valve body 230 includes a valve cavity and a diaphragm assembly. The diaphragm assembly is disposed within the valve cavity and can move within the valve cavity to open or close the valve body 230. The valve body 230 includes an upper cover 2301 and a main body 2302, which together form the valve cavity. The diaphragm assembly is disposed within the main body 2302. The diaphragm assembly includes an upper valve body 2304, a diaphragm 2305, and a lower valve body 2306. The upper valve body 2304 has an upper valve cavity, and the lower valve body 2306 has a lower valve cavity. The upper valve body 2304 and the lower valve body 2306 are interconnected, forming a valve cavity. The edge of the diaphragm 2305 is fixed between the upper valve body 2304 and the lower valve body 2306.

[0079] The driving device includes a movable rod 2303 and a spring 2307. The movable rod 2303 abuts against the spring 2307. One end of the movable rod 2303 is connected to the sub-rope 21. The spring 2307 is used to apply a spring force to the movable rod 2303 in the direction of the diaphragm assembly. The sub-rope 21 drives the movable rod 2303 away from the diaphragm assembly to open the valve body 230.

[0080] An isolation chamber is formed between the diaphragm 2305 and the upper valve body 2304. A guide hole is provided on the diaphragm 2305, which communicates with the valve body inlet 2311, allowing water to enter the isolation chamber. A pressure relief hole is provided at the top of the isolation chamber, opposite the end of the movable rod. When the pressure relief hole is closed, water flows into the isolation chamber through the guide hole, increasing the water pressure inside (to match the inlet pressure). This water pressure drives the diaphragm 2305 downwards, closing the valve body. When the movable rod is pulled up, the pressure relief hole opens, allowing water to drain from the isolation chamber through the pressure relief hole (the drained water flows to the valve body outlet 2312), reducing the water pressure inside the isolation chamber. This causes the diaphragm 2305 to move upwards, opening the valve body.

[0081] The pressure relief hole is controlled to be closed or opened by the movable rod 2303, such as Figure 5 and Figure 7 As shown, one end of the movable rod 2303 passes through the top of the upper valve body 2304 and enters the upper valve chamber. The other end of the movable rod 2303 extends upward to the outside of the housing 231 and is connected to the second sub-rope 25. One end of the spring 2307 is opposite to the diaphragm 2305, and the other end of the spring 2307 is connected to the diaphragm 2305. When the movable rod moves downward under the tension of the spring 2307, it will block the pressure relief hole, causing the diaphragm 2305 to move downward, thereby closing the valve body. Conversely, when the movable rod 2303 moves upward under the tension of the second sub-rope, the pressure relief hole is open, the diaphragm 2305 moves upward, thereby opening the valve body.

[0082] In some embodiments, the water inlet device 23 is a bistable water inlet device. Furthermore, to prevent seawater from overflowing from the sampling cylinder 2, a one-way valve is also provided in the water inlet channel of the water inlet device 23.

[0083] In some technical solutions, the seawater testing device includes a pre-filter and a physicochemical testing mechanism disposed at the rear end of the pre-filter.

[0084] In another embodiment, a seawater physiology testing device is also disclosed, comprising a seawater sampling device and a seawater testing device. The seawater sampling device is used to collect seawater, and the seawater testing device is used to test the collected seawater. The seawater testing device is used to detect any one or more of the following parameters of the seawater: pH, color, conductivity, total hardness, suspended solids, dissolved oxygen, chemical oxygen demand (COD), biochemical oxygen demand (BOD), ammonia nitrogen, cyanide, volatile phenols, petroleum hydrocarbons and animal and vegetable oils, sulfides, chlorides, fluorides, sulfate, and nitrates. That is, the seawater sampling device includes a pH meter, a conductivity meter, or other testing devices.

[0085] The seawater sampling device is Figure 1 The seawater sampling device shown is suspended by a crane on the ship to collect seawater samples. The seawater sampling device includes: a main rope 1, a counterweight 11, and a sampling cylinder 2. Figure 2 As shown, the boom includes: a multi-stage telescopic boom 31, a telescopic cylinder 34, a pulley 32, a winding drum 35, and a control cabinet 33. The telescopic cylinder 34 is connected to the multi-stage telescopic boom 31 and is used to control the extension and retraction of the multi-stage telescopic boom; the pulley 32 is located at the end of the multi-stage telescopic boom 31, and the main rope 1 is connected to the winding drum 35 after passing through the pulley 32. The rotation of the winding drum 35 drives the main rope 1 to rise and fall in the seawater.

[0086] The sampling cylinder 2 is slidably mounted on the main rope 1 along the main rope to descend to a predetermined depth along the sub-rope to collect seawater. The sampling cylinder 2 includes a cylinder body 20 and a water inlet device 23 located at the top of the cylinder body to introduce seawater into the cylinder body. The cylinder body 20 has a cylindrical structure and may be made of stainless steel. The interior of the cylinder body 20 has a cavity for containing seawater, and a handle 24 is also provided at the top of the cylinder body 20. The top of the cylinder body is connected to the main rope 1 via a sub-rope 21 and a movable collar 14. A counterweight 22 is provided at the bottom of the cylinder body, and the gravity of the counterweight 22 drives the sampling cylinder to slide down the main rope to the predetermined depth. The sub-rope 21 is connected to the handle 24, and the handle 24 is then connected to the water inlet device 23 via a second sub-rope. To facilitate emptying the seawater from the sampling cylinder, a water outlet with a water valve is provided at the bottom or other location of the sampling cylinder. The counterweight 22 can be connected to the bottom of the sampling tube via another sub-rope.

[0087] like Figure 2 and Figure 4 As shown, the sub-rope 21 is slidably connected to the main rope 1 via a movable collar 14. A conical limiting block 13 corresponding to the sub-rope 21 is provided at a predetermined depth on the main rope 1. The maximum outer diameter of the conical limiting block 13 is larger than the inner diameter of the movable collar 14, so that when the movable collar 14 and the sampling cylinder descend, they can abut against the conical limiting block 13.

[0088] like Figure 2 As shown, the counterweight 11 is connected to the tail of the main rope 1, and the other end of the main rope 1 is connected to the boom. The counterweight 11 can be made of high-density metals or alloys such as lead or tungsten steel to allow the main rope 1 to submerge. During sampling, the main rope 1 sinks into the seawater first under the action of the counterweight 11, with the bottom of the main rope 1 greater than or equal to the predetermined depth for seawater sampling. After the main rope 1 sinks and straightens, the sampling cylinder 2 submerges along the main rope under the action of the counterweight. Figure 4 As shown, when the sampling tube 2 descends to a predetermined depth along the main rope 1, the movable collar 14 and the conical limiting block 13 abut against each other, generating an upward force on the sub-rope. This force causes the sub-rope to pull the water inlet device upward, thereby triggering the water inlet device to open.

[0089] Finally, it should be noted that although the above embodiments have been described in the text and drawings of this application, this should not limit the scope of patent protection of this application. Any technical solutions that are based on the essential concept of this application and utilize the content described in the text and drawings of this application, resulting in equivalent structural or procedural substitutions or modifications, as well as the direct or indirect application of the technical solutions of the above embodiments to other related technical fields, are all included within the scope of patent protection of this application.

Claims

1. A seawater sampling device, characterized in that, include: The cylinder body, water inlet device, and counterweight; the water inlet device is located at the top of the cylinder body; The top of the cylinder is provided with a handle, and a sub-rope is connected to the handle. One end of the sub-rope is provided with a movable collar, which is used to movably connect with the main rope for seawater sampling, so that the cylinder can descend along the main rope under the action of the counterweight. The water inlet device includes a valve body and a drive device; the valve body includes a valve cavity and a diaphragm assembly, the diaphragm assembly being disposed within the valve cavity, and the diaphragm assembly being movable within the valve cavity to open or close the valve body; the drive device includes a movable rod and a spring, the movable rod abutting against the spring, one end of the movable rod extending upward outside the cylinder and connected to the sub-rope, the spring being used to apply a spring force to the movable rod pointing towards the diaphragm assembly; the sub-rope drives the movable rod away from the diaphragm assembly to open the valve body; A conical limiting block is provided at a predetermined depth on the main rope. The outer diameter of the conical limiting block is larger than the inner diameter of the movable collar, so that the movable collar can abut against the conical limiting block when the sampling cylinder descends. The tail end of the main rope is connected to another counterweight, which causes the main rope to sink into the seawater and keeps the main rope taut; after the main rope sinks and straightens, the sampling cylinder descends along the main rope under the action of the counterweight. When the sampling tube descends to a predetermined depth along the main rope, the movable collar and the conical limiting block abut against each other, generating an upward force on the sub-rope, causing the sub-rope to pull upward and trigger the water inlet device to open.

2. The seawater sampling device according to claim 1, characterized in that, The water inlet device includes a water inlet, a water inlet channel, and a water outlet arranged in sequence. The water inlet channel is an annular channel with a cavity in the middle, and the driving device is disposed in the cavity.

3. The seawater sampling device according to claim 1, characterized in that, The water inlet device is a bistable water inlet device.

4. The seawater sampling device according to any one of claims 1-3, characterized in that, A one-way valve is also installed in the water inlet channel of the water inlet device.

5. The seawater sampling device according to claim 1, characterized in that, The handle is a U-shaped handle, and the two ends of the handle are respectively hinged to the two sides of the top of the cylinder, so that the handle can swing relative to the cylinder.

6. The seawater sampling device according to claim 5, characterized in that, The sub-rope includes a first sub-rope and a second sub-rope. One end of the first sub-rope is connected to the movable collar, and the other end of the first sub-rope is connected to the handle. One end of the second sub-rope is connected to the handle, and the other end of the second sub-rope is connected to the movable rod. When the first sub-rope is lifted and the middle of the handle is moved away from the cylinder, the second sub-rope becomes taut and pulls the movable rod upward to trigger the water inlet device to open the water inlet.

7. The seawater sampling device according to claim 1, characterized in that, The main rope is equipped with depth markings.

8. The seawater sampling device according to claim 1, characterized in that, The cylinder is made of stainless steel, and the sub-rope is made of PE wire.

9. The seawater sampling device according to claim 1, characterized in that, The counterweight is connected to the cylinder via another sub-rope.

10. The seawater sampling device according to claim 1, characterized in that, The main rope is a circular steel cable; the inner wall of the movable collar is provided with multiple ball bearings that roll in contact with the steel cable.

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