Multi-water-depth sampling device

Abstract

The utility model discloses a multi-water-depth sampling device, aiming at solving the problem that the deepwater sampling efficiency still needs to be improved in the prior art. The device comprises a winding device, a gas source supply device and a sampling device, a gas supply pipe of the gas source device bypasses the winding device and then is connected with the sampling device together with a pull rope on the winding device, the sampling device comprises a driving cylinder, a sampling cylinder, a sampling plug, a sampling rope, a sealing pull rope and a sampling control device, the upper end of the driving cylinder is connected with the pull rope, and the lower end of the sampling cylinder is connected with the sealing pull rope. An air inlet of the driving cylinder is connected with an air supply pipe, a plurality of sampling barrels surround the outer wall of the lower side of the driving cylinder, the tail end of a piston rod at the upper end of the driving cylinder is connected with the upper end of a sampling piston through a plurality of sampling ropes, the lower end of the sampling piston is connected with a sampling plug through a sealing pull rope, and a sampling control device is arranged in the middle of each sampling rope. According to the technology, independence and accuracy of layer-by-layer water taking are guaranteed, and multiple times of sampling can be achieved through the multiple sampling barrels after single-time water entering.

Description

Technical Field

[0001] The utility model relates to the technical field of water sample detection devices, in particular to a multi-water depth sampling device. Background Art

[0002] With the development of science and technology, the continuous improvement of industrialization and urbanization, water pollution has become more and more serious, and water quality has gradually become an important issue that cannot be ignored in people's daily lives. In order to monitor the changes in water quality in rivers, lakes or groundwater, it is necessary to first sample sewage. When conducting water quality testing, both surface water and deep water need to be sampled and tested. The difficulty of obtaining surface water is usually relatively small. Deep water areas must be sampled by deep water samplers to further analyze and monitor water quality or plankton indicators in the water. Since deep water sampling operations are more complicated and time-consuming, it would be an efficient measure if the sampling equipment could complete water quality collection at multiple depths after entering the water once. In addition, when sampling at multiple depths, it is necessary to pay attention to the fact that sampling devices at different depths cannot be mixed with water quality at other depths to avoid interfering with the sampling of water quality at different depths, ensure the purity of water quality sampled at each depth, and ensure that the test results are more accurate.

[0003] After searching, the patent document with application number 202220637519.0 and utility model name “A groundwater sampling device for hydrogeology” records: “

[0021] The working principle and use process of the utility model: … When sampling in a deep water area, the deep water area sampling tube 1 is thrown to a suitable position, and the deep water area sampling tube 1 will sink. At this time, the air supply balloon 16 inflates the inflatable balloon 12 through the inflatable long tube 13. The volume of the inflatable balloon 12 expands, and the pressing end plate 9 is pressed downward. At this time, the sealing cover 8 releases the blockage of the water inlet port of the deep water area sampling tube 1, and the sampling of the deep water area is realized. After the sampling is completed, the air supply balloon 16 is inflated into the inflatable balloon 12 through the inflatable long tube 13. The over-inflation valve 15 releases the gas in the inflatable airbag 12, and under the resetting of the tightening spring 10, the sealing cover 8 re-presses and seals the water inlet end of the deep water sampling tube 1. In this way, the integrity and reliability of deep water water sample collection are guaranteed... When the inflatable long tube 13 is used, it is used as an inflatable hose on the one hand and as a traction structure for throwing during sampling on the other hand. "The patent document uses a single-time immersion and single-time sampling device, which is not suitable for completing the collection of multiple depths after one immersion. In addition, the inflatable long tube 13 is used as a traction structure for throwing during sampling, and its material may have elasticity and buoyancy, which affects the actual sampling depth. Utility Model Content

[0004] Aiming at the problem that the deep water sampling efficiency in the prior art still needs to be improved, the utility model provides a multi-water depth sampling device which has a reasonable structure, is convenient and efficient.

[0005] The technical solution of the utility model is to provide a multi-water depth sampling device with the following structure: it contains a winding device, an air source supply device and a sampling device, wherein the air supply pipe of the air source device bypasses the winding device and is connected to the sampling device together with the pull rope on the winding device, the sampling device contains a driving cylinder, a sampling tube, a sampling plug, a sampling rope, a sealing pull rope and a sampling control device, the upper end of the driving cylinder is connected to the pull rope, the air inlet of the driving cylinder is connected to the air supply pipe, a plurality of sampling tubes are arranged around the outer wall of the lower side of the driving cylinder, the end of the piston rod at the upper end of the driving cylinder is connected to the upper end of the sampling piston through a plurality of sampling ropes, the lower end of the sampling piston is connected to the sampling plug through the sealing pull rope, and a sampling control device is arranged in the middle of the sampling rope.

[0006] Preferably, the sampling control device comprises a hook, a cutting blade, an anti-slipping strip and a torsion spring, wherein the inner wall of the hook is provided with a cutting blade, the anti-slipping strip is hinged at the opening of the hook, and a torsion spring is provided on the hinge shaft.

[0007] Preferably, the sampling control device contains a sleeve and a flexible plug, wherein the upper end of the sleeve and the lower end of the flexible plug are respectively connected to the sampling rope, the lower end of the sleeve is provided with a sleeve hole, the diameter of the upper half of the flexible plug is larger than the diameter of the sleeve hole, and the flexible plug is interference connected in the sleeve hole.

[0008] Preferably, the sampling control device is a safety rope, which is made of hemp rope or cotton thread, and its tensile strength is smaller than that of the sampling rope.

[0009] Preferably, the sampling plug comprises a conical positioning column and a plug body, wherein the tip of the positioning column is connected to the bottom of the sampling piston through a sealing drawstring, and the other end of the positioning column is connected to the plugging end of the plug body.

[0010] Preferably, the conical positioning column is made of iron or nickel, a magnet is provided at the opening at the lower part of the sampling tube, and the conical positioning column is adsorbed on the sampling gas magnet.

[0011] Preferably, the gas source supply device is an air compressor or a compressed gas cylinder, the output end of which is connected to the air inlet of the driving cylinder through an air supply pipe, a valve is provided on the air supply pipe, and the air compressor is powered by a battery.

[0012] Preferably, a plurality of sampling tubes are equidistantly arranged around the outer wall of the lower side of the driving cylinder, and the number of layers of the sampling tubes is multiple layers, and the sampling tubes in each layer are staggeredly distributed.

[0013] Preferably, two branch pull ropes are symmetrically provided at the upper end of the driving cylinder, the branch pull ropes are connected to the pull ropes through a branch line joint, and a counterweight is provided at the lower end of the driving cylinder.

[0014] Preferably, the length of the sampling rope between the sampling barrel and the driving cylinder increases gradually.

[0015] Compared with the prior art, the multi-water depth sampling device of the utility model has the following advantages:

[0016] 1. The internal sampling piston is located at the lowest point at the beginning of sampling, which can ensure that when sampling deep water, there is no water from other layers inside, ensuring the independence and accuracy of water sampling layer by layer. Multiple sampling cylinders can achieve multiple samplings in a single entry.

[0017] 2. The reel transmits the pull rope downward, which can accurately start and stop the sampling at different depths. The non-retractability of the pull rope can more accurately reflect the sampling depth of the sampling device.

[0018] 3. The fixed-volume sampling tube can realize quantitative sampling and has good temporary storage function. It is not easy to leak underwater or mix with water samples from other depths. After going ashore, open them one by one to obtain water of different depths.

[0019] 4. A detachable counterweight is provided at the lower end of the driving cylinder, which can facilitate the transportation of the sampling device before or after entering the water and ensure the sinking speed after entering the water.

[0020] 5. The gas and some water temporarily stored in the tank body at the top of the driving cylinder are not easy to mix with the sampled water at the sampling tube at the bottom of the driving cylinder with a certain length, and will not cause water at different depths to flow into the sampling tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0022] Figure 2 It is a structural schematic diagram of the sampling device in the utility model;

[0023] Figure 3 It is one of the structural schematic diagrams of the sampling control device in the utility model;

[0024] Figure 4 This is the second structural diagram of the sampling control device in the utility model;

[0025] Figure 5 This is the third structural diagram of the sampling control device in the utility model;

[0026] Figure 6 This is one of the schematic diagrams of the top view of the positional relationship between the driving cylinder and the sampling tube in the utility model;

[0027] Figure 7 It is a schematic diagram of the positional relationship between the driving cylinder and the sampling tube in the utility model from a top view.

[0028] Figure 8 It is a schematic diagram of the structural changes of the sampling tube during the water absorption process in the utility model;

[0029] Fig. 9 It is a schematic diagram of the structure after the plug body is positioned in the utility model;

[0030] Fig.10 It is a structural schematic diagram of the branch line connector in the utility model.

[0031] In the accompanying drawings, reference numeral 1 is a sampling vessel, reference numeral 2 is an air supply device, reference numeral 3 is a reel, and reference numeral 4 is a sampling device.

[0032] 4-1 is a pull rope, 4-2 is a branching connector, 4-3 is an air supply pipe, 4-4 is a driving cylinder piston rod, 4-5 is a positioning ring, 4-6 is a driving cylinder, 4-7 is a sampling rope, 4-8 is a sampling control device, 4-9 is a branch pull rope, 4-10 is a sampling tube, 4-11 is a sampling piston, 4-12 is a conical positioning column, 4-13 is an air inlet pipe, 4-14 is a plug body, 4-15 is a counterweight, 4-16 is a sealing pull rope, and 4-17 is a magnet. 4-8-1 is a hook, 4-8-2 is a torsion spring, 4-8-3 is an anti-slip rotation strip, 4-8-4 is a cutting blade strip, 4-8-5 is a hanging ring, 4-8-6 is a sleeve, 4-8-7 is a flexible plug block, and 4-8-8 is a safety rope. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0034] The following is a further description of the multi-water depth sampling device of the utility model in conjunction with the accompanying drawings and specific embodiments: Figure 1 and 2 As shown, this embodiment contains a winding device, an air source supply device 2 and a sampling device 4, wherein the air supply pipe 4-3 of the air source device is connected to the sampling device 4 together with the pull rope 4-1 on the winding device after bypassing the winding device, and the sampling device 4 contains a driving cylinder 4-6, a sampling tube 4-10, a sampling plug, a sampling rope 4-7, a sealing pull rope 4-16 and a sampling control device 4-8, the upper end of the driving cylinder 4-6 is connected to the pull rope 4-1, the air inlet of the driving cylinder 4-6 is connected to the air supply pipe 4-3, a plurality of sampling tubes 4-10 are arranged around the outer wall of the lower side of the driving cylinder 4-6, the end of the piston rod at the upper end of the driving cylinder 4-6 is connected to the upper end of the sampling piston 4-11 through a plurality of sampling ropes 4-7, the lower end of the sampling piston 4-11 is connected to the sampling plug through the sealing pull rope 4-16, and a sampling control device 4-8 is arranged in the middle of the sampling rope 4-7.

[0035] The sampling vessel 1 is provided with an air supply device 2, a winding shaft 3 and a sampling device 4. During the sampling process, one end of the pull rope 4-1 on the winding shaft 3 is connected to the sampling device 4 and then sunk into the water area to be sampled. At the same time, a counterweight 4-15 can be arranged at the bottom of the sampling device 4 to achieve rapid diving and verticality of the sampling device 4 during diving, so that the length of the released pull rope 4-1 is closer to the actual water depth.

[0036] The reel 3 can realize the transmission of the pull rope 4-1 to a fixed length, and can accurately make the sampling device 4 reach the specified water depth. The air source supply device 2 supplies air to the air inlet at the bottom of the driving cylinder 4-6 through the air supply pipe 4-3, so that the driving cylinder piston rod 4-4 inside it will produce an upward displacement. During the displacement process, the driving cylinder piston rod 4-4 will gradually straighten the sampling ropes 4-7 of different lengths mounted on it, and pull the sampling piston 4-11 in the sampling tube 4-10 connected to it upward through each pull rope 4-1, so that the sampling tube 4-10 is filled with water of different sampling depths, and the bottom of each sampling tube is sealed through the plug body 4-14 below. After sealing, the driving cylinder piston rod 4-4 that continues to push upward will pass through the sampling control device 4-8 on the sampling rope 4-7, so that the sampling rope 4-7 is disconnected after excessive force is applied, so as to avoid excessive obstruction of the driving cylinder piston rod 4-4 from continuing to push, and provide protection for the driving cylinder piston rod 4-4 to continue to pull another sampling tube 4-10 through another sampling rope 4-7. The sampling control device 4-8 is a device that will disconnect when a specified force level is reached. It serves as a safety device to prevent excessive pulling of each sampling piston 4-11 during the sampling process, and serves as a switch to stop the sampling piston 4-11 in each sampling tube 4-10 from being pulled upward by the sampling rope 4-7 after sampling is completed.

[0037] The sampling piston 4-11 in the sampling tube 4-10 moves upward under the drag of the sampling rope 4-7, and absorbs water at the water depth while rising. When the sampling tube 4-10 is almost full, the opening at the bottom of the sampling piston 4-11 will be sealed by the plug body 4-14 connected by the sealing pull rope 4-16. The conical positioning column 4-12 arranged on the upper surface of the plug body 4-14 has a guiding function, which can help the plug body 4-14 below it to accurately plug into the bottom opening of the sampling tube 4-10. When conducting water quality testing, both surface water and deep water need to be sampled and tested. When sampling deep water, due to the deep depth, it is difficult for the commonly used sampling device to quickly penetrate into the specified position. This problem can be solved by adding a detachable counterweight 4-15. In addition, when carrying the sampling device 4 on water, the counterweight 4-15 can be removed first, and then installed before entering the water, or removed after sampling, so that it is convenient to carry the sampling device 4.

[0038] like Figure 3As shown, the embodiment 1 of the sampling device 4 is a structure similar to a hook 4-8-1, comprising a hook 4-8-1, a cutting blade 4-8-4, an anti-slipping strip 4-8-3 and a torsion spring 4-8-2, wherein the inner wall of the hook 4-8-1 is provided with a cutting blade 4-8-4, the opening of the hook 4-8-1 is hinged with an anti-slipping strip 4-8-3, and a torsion spring 4-8-2 is provided on the hinge axis. The opening of the hook 4-8-1 is hinged with an anti-slipping strip 4-8-3, which can achieve the closure of the opening of the hook 4-8-1 under the action of the torsion spring 4-8-2, and prevent the sampling rope 4-7 from escaping from the hook 4-8-1. The inner and outer walls of the hook 4-8-1 are slightly polished to have thinner edges, or a cutting blade 4-8-4 with slightly sharp edges is provided on it, both of which can provide a pulling force that is sufficient and less than the broken sampling rope 4-7 to complete the sampling action, and cut off the sampling rope 4-7 after the sampling is completed under a larger pulling force, thereby terminating the sampling action of the sampling tube 4-10 in which it is located. The pulling force can be determined after testing, and the hanging ring 4-8-5 can be used to tie a knot at the disconnection point, so as to facilitate the fixed-length cutting of the sampling rope 4-7 at the replacement point.

[0039] like Figure 4 As shown, the embodiment 2 of the sampling device 4 is an interference connection structure of a sleeve 4-8-6 and a flexible plug 4-8-7, comprising a sleeve 4-8-6 and a flexible plug 4-8-7, wherein the upper end of the sleeve 4-8-6 and the lower end of the flexible plug 4-8-7 are respectively connected to the sampling rope 4-7, the lower end of the sleeve 4-8-6 is provided with a sleeve hole, the diameter of the upper half of the flexible plug 4-8-7 is larger than the diameter of the sleeve hole, and the flexible plug 4-8-7 is interference connected in the sleeve hole. The flexible plug 4-8-7 at the lower opening of the sleeve 4-8-6 can also cut off the middle part of the sampling rope 4-7 under a large pulling force or detached, terminating the sampling action of the sampling tube 4-10, and the flexible plug 4-8-7 can be re-inserted into the lower opening of the sleeve 4-8-6 to achieve secondary non-destructive reuse, and the pulling force can also be tested to determine the size of the flexible plug 4-8-7.

[0040] like Figure 5 As shown, the embodiment 3 of the sampling device 4 is a safety rope 4-8-8, which can be made of the same material as the sampling rope 4-7, but the wire diameter should be slightly thinner, so that its tensile strength is less than that of the sampling rope 4-7. Other wires with a tensile strength less than that of the sampling rope 4-7 can also be used, such as hemp rope or cotton thread, so as to ensure that the breaking point during the tension process is at the safety rope 4-8-8, and the hanging ring 4-8-5 can be used to tie a knot at the breaking point, so as to facilitate the fixed length cutting of the safety rope 4-8-8 at the replacement position.

[0041] The sampling piston 4-11 can also be replaced by a sampling piston 4-11 rod. The gap between the upper end of the sampling piston 4-11 rod and the sampling piston 4-11 is small, which can largely avoid a certain amount of water from being poured into it. The upper end of the sampling tube 4-10 is penetrated by a sampling rope 4-7 connected to the sampling piston 4-11. A smaller aperture at the penetration point can also largely avoid a certain amount of water from being poured into it. The positioning ring 4-5 can contact the opening on the upper side of the driving cylinder 4-6 in advance, which can prevent the driving cylinder piston rod 4-4 from being over-pushed at this point.

[0042] The stroke change of the driving cylinder 4-6 is converted into small strokes of the driving cylinder piston rod 4-4 moving upward one by one, thereby completing the water absorption and sealing actions of each sampling tube 4-10 one by one.

[0043] The sampling plug contains a conical positioning column 4-12 and a plug body 4-14, wherein the tip of the positioning column is connected to the bottom of the sampling piston 4-11 through a sealing pull rope 4-16, and the other end of the positioning column is connected to the plug-in end of the plug body 4-14. The tip of the positioning column has a good guiding effect, which gradually centers and pulls up the plug body 4-14 to achieve the sealing of the lower part of the sampling tube 4-10. The conical positioning column 4-12 is made of iron or nickel, and a magnet 4-17 is provided at the opening at the lower part of the sampling tube 4-10, and the conical positioning column 4-12 is adsorbed on the sampling gas magnet 4-17. Since the sealing pull rope 4-16 on the plug body 4-14 may be entangled and intertwined here, interfering with the subsequent sealing action of the plug body 4-14, this phenomenon is prevented by attracting each other.

[0044] The gas source supply device 2 is an air compressor or a compressed gas cylinder, and its output end is connected to the air inlet of the driving cylinder 4-6 through the air supply pipe 4-3. A valve is provided on the air supply pipe 4-3, and the air compressor is powered by a battery. The amount of high-pressure gas stored in the compressed gas cylinder needs to meet the usage amount. The air supply pipe 4-3 is selected from a pipe with a small length elasticity after inflation. When the length elasticity is small, a scale can also be set on it to facilitate reading its water entry length at any time.

[0045] like Figure 6 and 7 As shown, in order to sample water of multiple depths in one entry into the water, a plurality of sampling tubes 4-10 are equidistantly arranged on the outer wall of the lower side of the driving cylinder 4-6. The sampling tubes 4-10 are arranged in multiple layers, and the sampling tubes 4-10 in each layer are staggered to prevent the respective sampling ropes 4-7 from contacting other sampling tubes 4-10 and affecting the water absorption process of the sampling tubes 4-10.

[0046] like Figure 8 and 9As shown, the schematic operation process of sampling at multiple water depths is as follows: the length of the sampling rope 4-7 between the sampling cylinder 4-10 and the driving cylinder 4-6 increases, and the difference in length is approximately equal to the movement stroke of the sampling piston 4-11 in the previous sampling cylinder 4-10. The sampling pistons 4-11 in each sampling cylinder 4-10 are pulled one by one in sequence. When the capacity of each sampling cylinder 4-10 is constant, after it is filled with water until the plug body 4-14 is sealed, the amount of gas required to disconnect it from the sampling rope 4-7 by the sampling control device 4-8 is basically equal. After the sampling rope 4-7 of the previous sampling cylinder 4-10 is broken by the specified amount of gas, the sampling device 4 is moved to a new depth, and the specified amount of gas is continued to be filled. The sampling rope 4-7 of the sampling cylinder 4-10 will be straightened, and the pulling action will continue to be realized through its sampling rope 4-7 until the sampling pistons 4-11 in each sampling cylinder 4-10 are pulled in sequence at different water depths in succession.

[0047] like Figure 8 and 9 As shown, the second schematic operation process of sampling at multiple water depths is as follows: the sampling pistons 4-11 in each sampling tube 4-10 are pulled one by one in sequence until they are full of water and the plug body 4-14 is sealed, and then the sampling control device 4-8 on the sampling rope 4-7 is pulled open. A barometer can be provided on the air inlet pipe 4-13 to observe the pressure of the air therein. With the increase of the air intake, the elongation resistance encountered by the driving cylinder piston rod 4-4 before and after sealing the plug body 4-14 and pulling open the sampling control device 4-8 will be significantly greater than the resistance during the water absorption process. At this time, the driving cylinder piston rod 4-4 needs a larger air pressure to store power, and its displacement speed will be slightly lower than the displacement speed during the water absorption process. At this time, a high-sensitivity barometer is used to observe and it will be found that the pressure will rise and fall slightly. At this time, it is considered that the sampling rope 4-7 of the sampling tube 4-10 is broken at the sampling control device 4-8. The sampling device 4 can be moved to a new water depth, and then continue to fill with an appropriate amount of gas, and continue to straighten and break the sampling rope 4-7 of the next sampling tube 4-10, until the sampling piston 4-11 in each sampling tube 4-10 is at a different water depth, and is pulled in sequence in succession to achieve sealing.

[0048] like Fig.10As shown, the upper end of the driving cylinder 4-6 is symmetrically provided with two branch pull ropes 4-9, and the branch pull ropes 4-9 are connected to the pull rope 4-1 through the branch joint 4-2, and the lower end of the driving cylinder 4-6 is provided with a counterweight 4-15. Marks can be provided every half meter on the pull rope 4-1 to facilitate reading the water depth reached by the sampling device 4. The branch joint 4-2 can divide the pull rope 4-1 into two branch pull ropes 4-9, so that the branch pull rope 4-9 can symmetrically lift and mount the sampling device 4. The length of the branch pull rope 4-9 is greater than the length of the driving cylinder piston rod 4-4, which can prevent the driving cylinder piston rod 4-4 from being restrained by the branch joint 4-2 after extending to the top. The lower end of the driving cylinder 4-6 is provided with a detachable counterweight 4-15, which can facilitate the transportation of the sampling device 4 before or after sampling, and ensure the sinking speed of the sampling device 4 after entering the water.

[0049] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A multi-water depth sampling device, characterized in that: It contains a winding device, an air source supply device and a sampling device, wherein the air supply pipe of the air source device bypasses the winding device and is connected to the sampling device together with the pull rope on the winding device. The sampling device contains a driving cylinder, a sampling tube, a sampling plug, a sampling rope, a sealing pull rope and a sampling control device. The upper end of the driving cylinder is connected to the pull rope, the air inlet of the driving cylinder is connected to the air supply pipe, a plurality of sampling tubes are arranged around the lower outer wall of the driving cylinder, the end of the piston rod at the upper end of the driving cylinder is connected to the upper end of the sampling piston through a plurality of sampling ropes, the lower end of the sampling piston is connected to the sampling plug through the sealing pull rope, and a sampling control device is arranged in the middle of the sampling rope.

2. The multi-water depth sampling device according to claim 1, characterized in that: The sampling control device comprises a hook, a cutting blade, an anti-slipping strip and a torsion spring, wherein the inner wall of the hook is provided with a cutting blade, the anti-slipping strip is hinged at the opening of the hook, and a torsion spring is provided on the hinge shaft.

3. The multi-water depth sampling device according to claim 1, characterized in that: The sampling control device comprises a sleeve and a flexible plug, wherein the upper end of the sleeve and the lower end of the flexible plug are respectively connected to the sampling rope, the lower end of the sleeve is provided with a sleeve hole, the diameter of the upper half of the flexible plug is larger than the diameter of the sleeve hole, and the flexible plug is interference connected in the sleeve hole.

4. The multi-water depth sampling device according to claim 1, characterized in that: The sampling control device is a safety rope, which is made of hemp rope or cotton thread, and its tensile strength is smaller than that of the sampling rope.

5. The multi-water depth sampling device according to claim 1, characterized in that: The sampling plug comprises a conical positioning column and a plug body, wherein the tip of the positioning column is connected to the bottom of the sampling piston through a sealing drawstring, and the other end of the positioning column is connected to the plugging end of the plug body.

6. The multi-water depth sampling device according to claim 5, characterized in that: The material of the conical positioning column is iron or nickel. A magnet is arranged at the opening at the lower part of the sampling tube, and the conical positioning column is adsorbed on the sampling gas magnet.

7. The multi-water depth sampling device according to claim 1, characterized in that: The gas source supply device is an air compressor or a compressed gas cylinder, the output end of which is connected to the air inlet of the driving cylinder through an air supply pipe, a valve is provided on the air supply pipe, and the air compressor is powered by a battery.

8. The multi-water depth sampling device according to claim 1, characterized in that: A plurality of sampling tubes are equidistantly arranged around the outer wall of the lower side of the driving cylinder. The sampling tubes are arranged in multiple layers, and the sampling tubes in each layer are staggeredly distributed.

9. The multi-water depth sampling device according to claim 1, characterized in that: Two branch pull ropes are symmetrically arranged at the upper end of the driving cylinder, and the branch pull ropes are connected to the pull ropes through a branch line joint. A counterweight is arranged at the lower end of the driving cylinder.

10. The multi-water depth sampling device according to claim 1, characterized in that: The length of the sampling rope between the sampling tube and the driving cylinder increases gradually.

Images