Sampling inspection equipment for collecting surface water

Abstract

The sampling inspection equipment comprises a sampling box, a plugging device, a supporting rod, a balancing weight and a pull rope, a water inlet is formed in the lower end face of the sampling box, the plugging device is arranged in the sampling box, the plugging device is used for closing or opening the water inlet, and the supporting rod is arranged in the sampling box. The upper end of the supporting rod is connected with the middle of the lower side face of the sampling box, the lower end of the supporting rod is connected with the middle of the upper side face of the balancing weight, the distance between the lower side face of the balancing weight and the water inlet is 50 cm, and one end of the pull rope is fixedly connected with the middle of the upper end face of the sampling box. Due to the adoption of the technical scheme, the sampling inspection equipment for collecting the surface water is more convenient to sample water at the position of a sampling point 0.5 m above the water bottom by using the sampling inspection equipment for collecting the surface water disclosed by the utility model.

Description

TECHNICAL FIELD

[0001] The utility model relates to environmental detection equipment technical field, concretely relates to a kind of sampling equipment for collecting surface water. BACKGROUND

[0002] Surface water refers to the total of dynamic water and static water on the surface of land, for example, the water in lake, reservoir is surface water.For lake, reservoir, usually need to set monitoring vertical line, to facilitate the water in lake, reservoir is sampled.For specific, for the water surface of width≤50m, need to set a vertical line at thalweg;For the water surface of width 50m~100m, need to set two vertical lines at left, right bank where there is obvious water flow;For the water surface of width≥100m, need to set three vertical lines at left, middle, right three places.Setting sampling point on sampling vertical line principle is: water depth≤5m, set one sampling point at 0.5m below water surface;Water depth 5~10m is not stratified, set two sampling points at 0.5m below water surface, 0.5m above water bottom;Water depth 5~10m is not stratified, set three sampling points at 0.5m below water surface, 1 / 2 inclined temperature layer, 0.5m above water bottom;Water depth>10m, except 0.5m below water surface, 0.5m above water bottom, set according to each inclined temperature stratification 1 / 2 place.

[0003] At present, when sampling the water at the sampling point position of 0.5m above water bottom, sampling personnel need to measure the total depth of water of water area needing sampling first, then use rope to hang sampling bucket, then put sampling bucket into water and gradually release rope, in the process of releasing rope, sampling bucket gradually drops in water, until the water inlet of sampling bucket drops to 0.5m above water bottom side, stop releasing rope, at this time, water at the sampling point position of 0.5m above water bottom can be sampled using sampling bucket.

[0004] When sampling water at the position of sampling point of 0.5m above water bottom using the above existing method, not only the total depth of water of water area needing sampling needs to be measured, but also the length of released rope needs to be measured in the process of releasing rope and making sampling bucket drop, so that the water inlet of sampling bucket can be more accurately dropped to 0.5m above water bottom side, it is more troublesome to sample water at the position of sampling point of 0.5m above water bottom using the existing method. UTILITY MODEL CONTENT

[0005] Therefore, the utility model aims at providing a kind of sampling equipment for collecting surface water to solve the technical problem that it is more troublesome to sample water at the position of sampling point of 0.5m above water bottom using the existing method.

[0006] The utility model realizes by following technical scheme:

[0007] A sampling device for collecting surface water includes a sampling box, a sealing device, a support rod, a counterweight, and a pull rope. The sampling box has a water inlet on its lower end face. The sealing device is disposed inside the sampling box and is used to close or open the water inlet. The upper end of the support rod is connected to the middle of the lower side of the sampling box, and the lower end is connected to the middle of the upper side of the counterweight. The distance from the lower side of the counterweight to the water inlet is 50 cm. One end of the pull rope is fixedly connected to the middle of the upper end face of the sampling box.

[0008] Furthermore, the sealing device includes a cylinder, a piston, and a driving unit. The cylinder is located inside the sampling box, with its lower end fixedly connected to the lower side plate of the sampling box and its upper end fixedly connected to the upper side plate of the sampling box. A connecting hole is provided on the lower end wall of the cylinder. The piston is located inside the cylinder and cooperates with the inner cavity of the cylinder. The driving unit is used to drive the piston to move upward so that the piston disengages from the connecting hole and the water inlet. The driving unit is also used to drive the piston to move downward so that the piston blocks the connecting hole and the water inlet.

[0009] Furthermore, the inlet is equipped with a filter screen; it also includes an exhaust hole and an exhaust pipe, the exhaust hole connecting the upper surface of the sampling box and the inner cavity of the sampling box, and the lower end of the exhaust pipe being fixedly connected to the exhaust hole.

[0010] Furthermore, the drive unit includes a fixed plate, a helical spring, and an inflation / exhaust unit. The fixed plate is fixed inside the cylinder, and a vent hole is formed on the fixed plate, which connects the upper and lower sides of the fixed plate. The upper end of the helical spring is fixedly connected to the fixed plate, and the lower end is fixedly connected to the piston. The inflation / exhaust unit is used to inflate air into the cylinder and also to expel air from the cylinder.

[0011] Furthermore, the upper side plate of the sampling box is provided with an air inlet, which connects the upper end face of the sampling box and the inner cavity of the cylinder; the inflation and deflation section includes a first air pump, a first connecting pipe, a first one-way valve, a first air outlet pipe, and a first valve. The upper end of the first connecting pipe is fixedly connected to the air outlet of the first air pump, and the lower end is fixedly connected to the air inlet. The first one-way valve is disposed on the first connecting pipe and is used to supply gas from the first air pump to the air inlet. One end of the first air outlet pipe is fixedly connected to the upper end wall of the first connecting pipe. The first end of the first air outlet pipe is located between the first one-way valve and the air inlet. The inner cavity of the first air outlet pipe is connected to the inner cavity of the first connecting pipe. The first valve is disposed on the first air outlet pipe.

[0012] Furthermore, it also includes a water outlet, a sampling tube, and a second valve. The sampling box has a water outlet on its side wall. One end of the sampling tube is fixed inside the water outlet, and the other end is located outside the sampling box. The sampling tube communicates with the inner cavity of the sampling box, and the second valve is located on the sampling tube.

[0013] Furthermore, a buoyancy block is fixed on the pull rope, and the product of the density of water and the volume of the buoyancy block is less than the sum of the mass of the buoyancy block, the mass of the support rod, the mass of the sampling box, and the mass of the counterweight.

[0014] Furthermore, it also includes an inflatable airbag, an inflation port, a second air pump, a second connecting pipe, a second one-way valve, a second air outlet pipe, and a third valve. The inflatable airbag is fixed to the pull rope, the inflation port is located on the inflatable airbag, the upper end of the second connecting pipe is fixedly connected to the air outlet of the second air pump, the lower end of the second connecting pipe is fixedly connected to the upper end of the inflation port and communicates with the inner cavity of the inflatable airbag, the second one-way valve is located on the second connecting pipe and is used to supply gas from the second air pump to the inflation port; one end of the second air outlet pipe is fixedly connected to the upper wall of the second connecting pipe, the first end of the second air outlet pipe is located between the second one-way valve and the inflation port, the inner cavity of the second air outlet pipe communicates with the inner cavity of the second connecting pipe, and the third valve is located on the second air outlet pipe.

[0015] Furthermore, the filter screen is detachably and fixedly connected to the water inlet.

[0016] Furthermore, the lower end of the first connecting pipe is detachably and fixedly connected to the air inlet, and the lower end of the exhaust pipe is detachably and fixedly connected to the exhaust outlet.

[0017] The beneficial effects of this utility model are as follows:

[0018] When using the sampling equipment for collecting surface water described in this utility model to sample water at a sampling point 0.5m above the bottom of the water body, it is not necessary to measure the total depth of the water body to be sampled, and it is not necessary to measure the length of the loosened rope during the process of releasing the pull rope and lowering the sampling box. This makes it more convenient to use the sampling equipment for collecting surface water described in this utility model to sample water at a sampling point 0.5m above the bottom of the water body.

[0019] Other advantages, objectives, and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination and study, or may be learned from practice of this invention. The objectives and other advantages of this invention can be realized and obtained through the following description. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of a sampling device for collecting surface water according to the present invention;

[0021] Figure 2 This is a right view of a sampling device for collecting surface water according to the present invention.

[0022] Figure 3 for Figure 2 A sectional view of AA;

[0023] Figure 4 for Figure 3 A magnified view of a section at point B in the middle;

[0024] Figure 5 for Figure 3 A magnified view of a section at point C.

[0025] In the diagram: 1. Sampling box; 21. Cylinder; 22. Piston; 23. Connecting hole; 241. Fixing plate; 2411. Vent hole; 242. Helical spring; 2431. First connecting pipe; 2432. First one-way valve; 2433. First air outlet pipe; 2434. First valve; 3. Support rod; 4. Counterweight; 5. Pull rope; 6. Filter screen; 7. Exhaust pipe; 8. Sampling tube; 9. Second valve; 10. Buoyancy block; 11. Inflatable airbag; 12. Second connecting pipe; 13. Second one-way valve; 14. Second air outlet pipe; 15. Third valve. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0028] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0029] In the above description of this utility model, it should be noted that the terms "one side," "the other side," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0030] Furthermore, terms such as "identical" do not imply that components must be absolutely identical; minor differences are permissible. The term "perpendicular" simply means that the positional relationship between components is more perpendicular than "parallel," not that the structure must be perfectly perpendicular; a slight tilt is acceptable.

[0031] Please see Figures 1-5 This utility model provides a technical solution: a sampling device for collecting surface water, including a sampling box 1, a sealing device, a support rod 3, a counterweight 4, and a pull rope 5. The lower end face of the sampling box 1 is provided with a water inlet. The sealing device is set inside the sampling box 1 and is used to close or open the water inlet. The upper end of the support rod 3 is connected to the middle of the lower side of the sampling box 1, and the lower end is connected to the middle of the upper side of the counterweight 4. The distance from the lower side of the counterweight 4 to the water inlet is 50cm. One end of the pull rope 5 is fixedly connected to the middle of the upper end face of the sampling box 1.

[0032] The initial state of the sealing device is with the inlet closed. When using the sampling equipment for collecting surface water described in this utility model to collect water samples at a depth of 0.5m above the bottom of the water body, the sampling personnel hold the pull rope 5 and place the sampling box 1, support rod 3, and counterweight 4 into the water. Then, the sampling personnel gradually release the pull rope 5, and the sampling box 1, support rod 3, and counterweight 4 gradually sink underwater. After the sampling box 1, support rod 3, and counterweight 4 have gradually sunk a certain distance underwater, the tension on the pull rope 5 will suddenly decrease. At this point, the counterweight 4 has reached the bottom, and the sampling personnel can stop releasing the pull rope 5.

[0033] Then, the sealing device is switched to the open inlet state, and the water sample enters the sampling box 1 through the inlet. At this time, the sampling box 1 can collect water. Since the upper end of the support rod 3 is connected to the middle of the lower side of the sampling box 1 and the lower end is connected to the middle of the upper side of the counterweight 4, and the distance from the lower side of the counterweight 4 to the inlet is 50cm, the water collected by the sampling box 1 at this time is the water at the sampling point 0.5m above the bottom of the water.

[0034] After the inlet is kept open for a period of time, the sampling personnel switch the sealing device to the state of closing the inlet and pull the rope 5 upward, causing the sampling box 1, support rod 3 and counterweight 4 to gradually rise until they leave the water surface, thus completing the collection of water samples from 0.5m above the bottom of the water area to be sampled.

[0035] When using the sampling equipment for collecting surface water described in this utility model to sample water at a sampling point 0.5m above the bottom of the water body, it is not necessary to measure the total depth of the water in the area to be sampled, and it is not necessary to measure the length of the loosened rope 5 during the process of releasing the pull rope 5 and lowering the sampling box 1. This makes it more convenient to use the sampling equipment for collecting surface water described in this utility model to sample water at a sampling point 0.5m above the bottom of the water body.

[0036] In this embodiment: the sealing device includes a cylinder 21, a piston 22, and a driving unit. The cylinder 21 is located inside the sampling box 1. The lower end of the cylinder 21 is fixedly connected to the lower side plate of the sampling box 1, and the upper end of the cylinder 21 is fixedly connected to the upper side plate of the sampling box 1. A connecting hole 23 is provided on the lower end wall of the cylinder 21. The piston 22 is located inside the cylinder 21 and cooperates with the inner cavity of the cylinder 21. The driving unit is used to drive the piston 22 to move upward so that the piston 22 disengages from the connecting hole 23 and the water inlet. The driving unit is also used to drive the piston 22 to move downward so that the piston 22 blocks the connecting hole 23 and the water inlet.

[0037] In the initial state, the piston 22 blocks the connecting hole 23 and the water inlet, the water inlet is in a closed state, and water cannot enter the sampling box 1 from the water inlet.

[0038] The driving unit drives the piston 22 to move upward within the cylinder 21, disengaging the piston 22 from the connecting hole 23 and the water inlet. At this point, the sealing device can open the water inlet, allowing water from outside the sampling box 1 to enter the sampling box 1 sequentially through the water inlet and the connecting hole 23. Conversely, the driving unit drives the piston 22 to move downward within the cylinder 21, blocking the connecting hole 23 and the water inlet. At this point, the water inlet is closed, preventing water from entering the sampling box 1. With this structure, the sealing device can either close or open the water inlet.

[0039] In this embodiment: a filter screen plate 6 is provided inside the water inlet; it also includes an exhaust hole and an exhaust pipe 7. The exhaust hole connects the upper end face of the sampling box 1 and the inner cavity of the sampling box 1, and the lower end of the exhaust pipe 7 is fixedly connected to the exhaust hole.

[0040] Throughout the entire process of collecting water at a sampling point 0.5m above the bottom using the sampling equipment described in this utility model for collecting surface water, the upper end of the exhaust pipe 7 is always kept above the water surface. As water enters the sampling box 1 from the inlet, air inside the sampling box 1 is discharged through the exhaust pipe 7, allowing water to smoothly enter the sampling box 1 through the inlet. During the process of water entering the sampling box 1 from the inlet, the filter screen 6 can block large particles outside the inlet, reducing impurities in the collected water.

[0041] In this embodiment: the driving unit includes a fixed plate 241, a helical spring 242, and an inflation / exhaust unit. The fixed plate 241 is fixed inside the cylinder 21. A vent hole 2411 is formed on the fixed plate 241, and the vent hole 2411 connects the upper and lower sides of the fixed plate 241. The upper end of the helical spring 242 is fixedly connected to the fixed plate 241, and the lower end is fixedly connected to the piston 22. The inflation / exhaust unit is used to fill the cylinder 21 with air, and the inflation / exhaust unit is also used to exhaust the air inside the cylinder 21.

[0042] Air is introduced into the cylinder 21 through the inflation and deflation section, and the air pressure inside the cylinder 21 gradually increases. The piston 22 can move downward under the thrust of the air pressure. During the downward movement of the piston 22, the helical spring 242 is gradually stretched. When a certain amount of gas is introduced into the cylinder 21, that is, after the piston 22 moves downward a certain distance, the piston 22 can block the connecting hole 23 and the water inlet. With this structure, the driving part can drive the piston 22 to move downward so that the piston 22 blocks the connecting hole 23 and the water inlet.

[0043] The air inside the cylinder 21 is discharged through the inflation and deflation section, and the air pressure inside the cylinder 21 gradually decreases. Under the tension of the helical spring 242, the piston 22 moves upward. After a certain amount of gas is discharged into the cylinder 21, that is, after the piston 22 moves upward a certain distance, the piston 22 can disengage from the connecting hole 23 and the water inlet. With this structure, the driving part can drive the piston 22 to move upward so that the piston 22 disengages from the connecting hole 23 and the water inlet.

[0044] In this embodiment: the upper side plate of the sampling box 1 is provided with an air inlet, which connects the upper end face of the sampling box 1 and the inner cavity of the cylinder 21; the inflation and deflation section includes a first air pump, a first connecting pipe 2431, a first one-way valve 2432, a first air outlet pipe 2433, and a first valve 2434. The first air pump can be a VLK5005 air pump (not shown in the figure). The upper end of the first connecting pipe 2431 is fixedly connected to the air outlet of the first air pump, and the lower end is fixedly connected to the air inlet. A first one-way valve 2432 is disposed on the first connecting pipe 2431. The first one-way valve 2432 is used to supply gas from the first air inlet pump to the air inlet. One end of the first air outlet pipe 2433 is fixedly connected to the upper end wall of the first connecting pipe 2431. The first end of the first air outlet pipe 2433 is located between the first one-way valve 2432 and the air inlet. The inner cavity of the first air outlet pipe 2433 is connected to the inner cavity of the first connecting pipe 2431. The first valve 2434 is disposed on the first air outlet pipe 2433.

[0045] When it is necessary to inflate the cylinder 21, the first valve 2434 is closed and the first air pump is turned on. Air enters the cylinder 21 through the air outlet of the first air pump, the first connecting pipe 2431 and the air inlet in sequence. With this structure, the inflation and exhaust section can inflate the cylinder 21 with air.

[0046] When it is necessary to expel the air from the cylinder 21, the first valve 2434 is opened, and the air in the cylinder 21 can be discharged in sequence through the air inlet, the first connecting pipe 2431 and the first air outlet pipe 2433. With this structure, the inflation and exhaust section can discharge the air from the cylinder 21.

[0047] In this embodiment: the sampling device for collecting surface water according to the present invention further includes a water outlet, a sampling tube 8 and a second valve 9. The sampling box 1 is provided with a water outlet on its side wall. One end of the sampling tube 8 is fixed inside the water outlet and the other end is located outside the sampling box 1. The sampling tube 8 is connected to the inner cavity of the sampling box 1. The second valve 9 is provided on the sampling tube 8.

[0048] The second valve 9 is initially closed, and remains closed after the sampling box 1 enters the water. This prevents water from flowing into the inner cavity of the sampling box 1 from the sampling tube 8 and the outlet as the sampling box 1 descends in the water. After sampling is completed and the sampling box 1 is pulled out of the water, the second valve 9 is opened, allowing the water collected in the inner cavity of the sampling box 1 to flow out sequentially through the outlet and the sampling tube 8.

[0049] In this embodiment: a buoyancy block 10 is fixed on the pull rope 5. The buoyancy block 10 can be a foam block. The product of the density of water and the volume of the buoyancy block 10 is less than the sum of the mass of the buoyancy block 10, the mass of the support rod 3, the mass of the sampling box 1, and the mass of the counterweight 4.

[0050] During the process of lowering the sampling box 1, support rod 3, and counterweight 4 into the water and lifting the sampling box 1, support rod 3, and counterweight 4 upwards, the water will generate buoyancy on the buoyancy block 10, making it easier for the sampling personnel to release the pull rope 5 downwards and pull the pull rope 5 upwards.

[0051] In this embodiment, the system further includes an inflatable airbag 11, an inflation port, a second air pump, a second connecting pipe 12, a second one-way valve 13, a second air outlet pipe 14, and a third valve 15. The inflatable airbag 11 is fixed to the pull rope 5, and the inflation port is located on the inflatable airbag 11. The second air pump can be a VLK5005 air pump (not shown in the figure). The upper end of the second connecting pipe 12 is fixedly connected to the air outlet of the second air pump, and the lower end of the second connecting pipe 12 is fixedly connected to the upper end of the inflation port. The inner cavity of the inflatable airbag 11 is connected, and the second one-way valve 13 is disposed on the second connecting pipe 12. The second one-way valve 13 is used to supply gas from the second air inlet pump to the inflation hole; one end of the second air outlet pipe 14 is fixedly connected to the upper end wall of the second connecting pipe 12, and the one end of the second air outlet pipe 14 is located between the second one-way valve 13 and the inflation hole. The inner cavity of the second air outlet pipe 14 is connected to the inner cavity of the second connecting pipe 12, and the third valve 15 is disposed on the second air outlet pipe 14.

[0052] The inflatable airbag 11 is initially in an uninflated state. During the process of the sampling box 1, support rod 3 and counterweight 4 being submerged underwater, and during the process of water sample entering the sampling box 1 from the inlet, the inflatable airbag 11 remains in an uninflated state.

[0053] When it is necessary to make the sampling box 1, support rod 3, and counterweight 4 rise in the water, air is injected into the inflatable bladder 11. Specifically, the third valve 15 is closed and the second air pump is turned on. Air enters the inflatable bladder 11 through the air outlet of the second air pump, the second connecting pipe 12, and the inflation hole in sequence. The volume of the inflatable bladder 11 gradually increases, and the buoyancy generated by the water on the inflatable bladder 11 gradually increases. The inflatable bladder 11 can float up and drive the buoyancy block 10, sampling box 1, and counterweight 4 to float up in the water, making it more convenient to make the sampling box 1, support rod 3, and counterweight 4 rise in the water.

[0054] When it is necessary to release the air inside the inflatable airbag 11, the third valve 15 is opened, and the air inside the inflatable airbag 11 can be released sequentially through the inflation hole, the second connecting pipe 12 and the second air outlet pipe 14. With this structure, the inflatable airbag 11 can return to the uninflated state.

[0055] In this embodiment: the filter screen plate 6 is detachably fixedly connected to the water inlet. Specifically, both the filter screen plate 6 and the water inlet are circular. The outer circumferential surface of the filter screen plate 6 is provided with external threads (not shown in the figure), and the side wall of the water inlet is provided with internal threads (not shown in the figure). The filter screen plate 6 is threadedly connected to the water inlet. With this structure, the filter screen plate 6 can be detachably connected to the water inlet.

[0056] After the sampling equipment for collecting surface water described in this utility model has been used, the filter screen 6 can be removed from the water inlet for cleaning.

[0057] In this embodiment: the lower end of the first connecting pipe 2431 is detachably and fixedly connected to the air inlet, and the lower end of the exhaust pipe 7 is detachably and fixedly connected to the exhaust port. Specifically, the outer circumferential surface of the lower end of the first connecting pipe 2431 is provided with an external thread (not shown in the figure), and the side wall of the air inlet is provided with an internal thread (not shown in the figure). The first connecting pipe 2431 is threadedly connected to the air inlet. With this structure, the first connecting pipe 2431 can be detachably connected to the air inlet. The outer circumferential surface of the lower end of the exhaust pipe 7 is provided with an external thread (not shown in the figure), and the side wall of the exhaust port is provided with an internal thread (not shown in the figure). The exhaust pipe 7 is threadedly connected to the exhaust port. With this structure, the exhaust pipe 7 can be detachably connected to the exhaust port.

[0058] Before and after using the sampling equipment for collecting surface water described in this utility model, the lower end of the first connecting pipe 2431 can be removed from the air inlet, and the lower end of the exhaust pipe 7 can be removed from the exhaust outlet for easy storage.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A sampling device for collecting surface water, characterized in that: The sample box (1), sealing device, support rod (3), counterweight (4), and pull rope (5) are included. The lower end face of the sample box (1) is provided with a water inlet. The sealing device is set inside the sample box (1) and is used to close or open the water inlet. The upper end of the support rod (3) is connected to the middle of the lower side of the sample box (1), and the lower end is connected to the middle of the upper side of the counterweight (4). The distance from the lower side of the counterweight (4) to the water inlet is 50cm. One end of the pull rope (5) is fixedly connected to the middle of the upper end face of the sample box (1).

2. The sampling equipment for collecting surface water according to claim 1, characterized in that: The sealing device includes a cylinder (21), a piston (22), and a driving unit. The cylinder (21) is located inside the sampling box (1). The lower end of the cylinder (21) is fixedly connected to the lower side plate of the sampling box (1), and the upper end of the cylinder (21) is fixedly connected to the upper side plate of the sampling box (1). A connecting hole (23) is provided on the lower end wall of the cylinder (21). The piston (22) is located inside the cylinder (21) and cooperates with the inner cavity of the cylinder (21). The driving unit is used to drive the piston (22) to move upward so that the piston (22) disengages from the connecting hole (23) and the water inlet. The driving unit is also used to drive the piston (22) to move downward so that the piston (22) blocks the connecting hole (23) and the water inlet.

3. The sampling equipment for collecting surface water according to claim 2, characterized in that: The inlet is equipped with a filter screen (6); it also includes an exhaust hole and an exhaust pipe (7). The exhaust hole connects the upper surface of the sampling box (1) and the inner cavity of the sampling box (1), and the lower end of the exhaust pipe (7) is fixedly connected to the exhaust hole.

4. The sampling equipment for collecting surface water according to claim 3, characterized in that: The drive unit includes a fixed plate (241), a helical spring (242), and an inflation / exhaust unit. The fixed plate (241) is fixed inside the cylinder (21). A vent hole (2411) is formed on the fixed plate (241), and the vent hole (2411) connects the upper and lower sides of the fixed plate (241). The upper end of the helical spring (242) is fixedly connected to the fixed plate (241), and the lower end is fixedly connected to the piston (22). The inflation / exhaust unit is used to inflate air into the cylinder (21) and to expel air from the cylinder (21).

5. The sampling equipment for collecting surface water according to claim 4, characterized in that: The sampling box (1) has an air inlet on its upper side plate, which connects the upper end face of the sampling box (1) and the inner cavity of the cylinder (21). The inflation and deflation section includes a first air pump, a first connecting pipe (2431), a first one-way valve (2432), a first air outlet pipe (2433), and a first valve (2434). The upper end of the first connecting pipe (2431) is fixedly connected to the air outlet of the first air pump, and the lower end is fixedly connected to the air inlet. The first one-way valve (2432) is disposed on the first connecting pipe (2433). On 2431), the first one-way valve (2432) is used to supply gas from the first air inlet pump to the air inlet; one end of the first air outlet pipe (2433) is fixedly connected to the upper end wall of the first connecting pipe (2431), the one end of the first air outlet pipe (2433) is located between the first one-way valve (2432) and the air inlet, the inner cavity of the first air outlet pipe (2433) is connected to the inner cavity of the first connecting pipe (2431), and the first valve (2434) is provided on the first air outlet pipe (2433).

6. The sampling equipment for collecting surface water according to claim 1, characterized in that: It also includes a water outlet, a sampling tube (8) and a second valve (9). The sampling box (1) has a water outlet on its side wall. One end of the sampling tube (8) is fixed inside the water outlet and the other end is located outside the sampling box (1). The sampling tube (8) is connected to the inner cavity of the sampling box (1). The second valve (9) is located on the sampling tube (8).

7. The sampling equipment for collecting surface water according to claim 5, characterized in that: A buoyancy block (10) is fixed on the pull rope (5). The product of the density of water and the volume of the buoyancy block (10) is less than the sum of the mass of the buoyancy block (10), the mass of the support rod (3), the mass of the sampling box (1), and the mass of the counterweight (4).

8. The sampling equipment for collecting surface water according to claim 7, characterized in that: It also includes an inflatable airbag (11), an inflation port, a second air pump, a second connecting pipe (12), a second one-way valve (13), a second air outlet pipe (14), and a third valve (15). The inflatable airbag (11) is fixed to the pull rope (5). The inflation port is located on the inflatable airbag (11). The upper end of the second connecting pipe (12) is fixedly connected to the air outlet of the second air pump. The lower end of the second connecting pipe (12) is fixedly connected to the upper end of the inflation port and communicates with the inner cavity of the inflatable airbag (11). The second one-way valve (13) is also included. A check valve (13) is provided on the second connecting pipe (12). The second check valve (13) is used to supply gas from the second air inlet pump to the inflation port. One end of the second air outlet pipe (14) is fixedly connected to the upper wall of the second connecting pipe (12). The first end of the second air outlet pipe (14) is located between the second check valve (13) and the inflation port. The inner cavity of the second air outlet pipe (14) is connected to the inner cavity of the second connecting pipe (12). The third valve (15) is provided on the second air outlet pipe (14).

9. The sampling equipment for collecting surface water according to claim 3, characterized in that: The filter screen (6) is detachably and fixedly connected to the water inlet.

10. The sampling equipment for collecting surface water according to claim 5, characterized in that: The lower end of the first connecting pipe (2431) is detachably and fixedly connected to the air inlet, and the lower end of the exhaust pipe (7) is detachably and fixedly connected to the exhaust outlet.

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