Automatic sampling device for heavy metal release from lake sediment

Abstract

The present invention relates to the field of environmental protection, and in particular, to an automatic sampling device for heavy metal release from lake sediment, which is used to be placed at the bottom of a lake or river to collect heavy metals in the sediment, and comprises a sampling box, filter paper, a first power mechanism, and a second power mechanism. A sampling port is provided at the bottom of the sampling box, and the filter paper is provided in the sampling box to shield the sampling port to filter particulate matter in a water sample flowing into the sampling box; the sampling box comprises a water tank and a sample box provided above the sampling port, the water tank is used to store ultrapure water, the first power mechanism is provided in the water tank to discharge the ultrapure water in the water tank, and the second power mechanism is provided in the sample box to draw a water sample containing heavy metals released from the sediment into the sample box when the ultrapure water in the water tank is discharged by the first power mechanism. The automatic sampling device for heavy metal release from lake sediment of the present invention is easy to operate when collecting sediment from lakes or rivers.

Description

Technical Field

[0001] The invention relates to the field of environmental protection, and in particular to an automatic sampling device for heavy metal release in lake sediment. Background Art

[0002] In recent years, due to the large amount of wastewater discharged into the lake area, the lake has become increasingly polluted, especially the heavy metal pollution in the sediment. Therefore, the research on heavy metals in lake sediment has become one of the research hotspots. This research generally requires collecting the sediment first, and then conducting heavy metal release research. After collecting the sediment, the heavy metal release research is easily affected by the sediment collection and transportation process; therefore, the relevant technology will directly collect the heavy metal water samples released by the sediment.

[0003] However, the operation of collecting water samples of heavy metals released from sediment provided by the related technology is inconvenient. Summary of the invention

[0004] The purpose of the present invention is to provide an automatic sampling device for heavy metal release from lake sediment, which is easy to operate when collecting water samples of heavy metals released from lake and river sediments.

[0005] The embodiment of the present invention is achieved as follows:

[0006] In the first aspect, an embodiment of the present invention provides an automatic sampling device for heavy metal release from lake sediment, which is placed at the bottom of lakes and rivers to collect heavy metals in the sediment. The automatic sampling device for heavy metal release from lake sediment comprises a sampling box, filter paper, a first power mechanism and a second power mechanism. A sampling port is provided at the bottom of the sampling box. The filter paper is provided on the sampling box to cover the sampling port so as to filter particulate matter in the water sample flowing into the sampling box. The sampling box comprises a water tank and a sample box provided above the sampling port. The water tank is used to store ultrapure water. The first power mechanism is provided on the water tank to discharge the ultrapure water in the water tank. The second power mechanism is provided on the sample box to draw a water sample containing heavy metals released from the sediment into the sample box when the first power mechanism discharges the ultrapure water in the water tank.

[0007] In an optional embodiment, the sampling box also includes a transition box, the water tank and the sample box are both arranged on the upper part of the transition box and connected to the transition box, and a sampling port is opened at the lower part of the transition box.

[0008] In an optional embodiment, a sample inlet is provided at the bottom of the sample box, and the automatic sampling device for heavy metal release from lake sediment further comprises a valve, which is provided at the sample box and is used to close or open the sample inlet.

[0009] In an alternative embodiment, the valve is a solenoid valve.

[0010] In an optional embodiment, the automatic sampling device for heavy metal release from lake sediment further includes a positioning mechanism, which is disposed at the bottom of the sampling box and is used to fix the sampling box on the sediment.

[0011] In an optional embodiment, the positioning mechanism includes a mud nail and a driving assembly. The driving assembly is disposed on the sampling box and is transmission-connected to the mud nail for driving the mud nail to extend or retract relative to the sampling box.

[0012] In an optional embodiment, the automatic sampling device for heavy metal release from lake sediment also includes a detection component, which is arranged at the bottom of the sampling box and is electrically connected to the positioning mechanism. The detection component is used to control the positioning mechanism to fix the sampling box on the sediment when the bottom of the sampling box contacts the sediment.

[0013] In an optional embodiment, the automatic sampling device for lake sediment heavy metal release also includes a float, which is arranged in the sampling box.

[0014] In an optional embodiment, a rope hook is provided on the top of the sampling box.

[0015] In an optional embodiment, the rope hook is detachably connected to the traction rope.

[0016] The beneficial effects of the automatic sampling device for heavy metal release from lake sediments of the embodiment of the present invention include: the automatic sampling device for heavy metal release from lake sediments provided by the embodiment of the present invention can be placed at the bottom of lakes and rivers to collect heavy metals in the sediments, the automatic sampling device for heavy metal release from lake sediments comprises a sampling box, filter paper, a first power mechanism and a second power mechanism, a sampling port is provided at the bottom of the sampling box, the filter paper is provided on the sampling box, and is used to cover the sampling port to filter particulate matter in the water sample flowing into the sampling box; the sampling box comprises a water tank and a sample box provided above the sampling port, the water tank is used to store ultrapure water, the first power mechanism is provided on the water tank, and is used to discharge the ultrapure water in the water tank, the second power mechanism is provided on the sample box, and is used to draw a water sample containing heavy metals released from the sediment into the sample box when the first power mechanism discharges the ultrapure water in the water tank. When using the automatic sampling device for heavy metal release from lake sediment to collect sediments from lakes and rivers, the automatic sampling device for heavy metal release from lake sediments is placed on the sediment at the bottom of lakes and rivers. The water from lakes and rivers enters the sampling box after particulate matter is filtered out by filter paper. The ultrapure water in the water tank is then discharged by the first power mechanism. Since the concentration of heavy metals in the water is lower than that in the sediment, the heavy metals in the sediment will be released and diffused into the water. The heavy metals released and diffused from the sediment can then enter the water in the sampling box through the sampling port covered and blocked by the filter paper to become water samples to be collected. The water samples in the sampling box are then drawn into the sample box by the second power mechanism to complete the collection of water samples of heavy metals released from the sediment. The automatic sampling device for heavy metal release from lake sediment is simple and easy to operate to collect water samples of heavy metals. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 The structure of the device for collecting heavy metals in sediment according to the present invention is shown in FIG. Figure 1 ;

[0019] Figure 2 The structure of the device for collecting heavy metals in sediment according to the present invention is shown in FIG. Figure 2 .

[0020] Icons: 010-Automatic sampling device for heavy metal release from lake sediment; 100-Sampling box; 110-Filter paper; 120-Water tank; 130-Sample box; 140-Transition box; 141-Balance valve; 150-Positioning mechanism; 151-Mud nail; 152-Drive assembly; 160-Detection part; 171-Float; 172-Rope hook; 173-Traction rope; 174-Control device; 175-Power supply device. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0022] 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 invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0024] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the invented product is usually placed when in use, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0025] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "disposed" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] This embodiment provides an automatic sampling device for heavy metal release from lake sediment, which is used to be placed at the bottom of lakes or rivers to collect heavy metals in the sediment.

[0027] Please refer to Figure 1 The automatic sampling device 010 for heavy metal release from lake sediment includes a sampling box 100, a filter paper 110, a first power mechanism and a second power mechanism. A sampling port is provided at the bottom of the sampling box 100. The filter paper 110 is provided at the sampling box 100 to cover the sampling port so as to filter particulate matter in the water sample flowing into the sampling box 100. The sampling box 100 includes a water tank 120 and a sample box 130 provided above the sampling port. The water tank 120 is used to store ultrapure water. The first power mechanism is provided at the water tank 120 to discharge the ultrapure water in the water tank. The second power mechanism is provided at the sample box 130 to draw the water sample containing heavy metals released from the sediment into the sample box 130 when the ultrapure water in the water tank 120 is discharged by the first power mechanism.

[0028] When using the automatic sampling device 010 for releasing heavy metals from lake sediments to collect sediments from lakes and rivers, the automatic sampling device 010 for releasing heavy metals from lake sediments is placed on the sediments at the bottom of lakes and rivers. The water of lakes and rivers enters the sampling box 100 after the particles are filtered out by the filter paper 110. Then, the ultrapure water in the water tank 120 is discharged by the first power mechanism. Since the concentration of heavy metals in the water is lower than that in the sediments, the heavy metals in the sediments will be released and diffused into the water, thereby allowing the heavy metals released and diffused from the sediments to pass through the areas covered and blocked by the filter paper 110. The water in the sampling box 100 is entered through the sampling port and becomes the water sample to be collected. The water sample in the sampling box is then drawn into the sample box by the second power mechanism to complete the collection of the water sample of heavy metals released from the sediment. In this way, the heavy metals released from the sediment can be allowed to enter the water sample in the sampling box 100 by utilizing the principle of heavy metal diffusion from high concentration to low concentration. This makes it easier to collect the water sample containing the heavy metals released from the sediment into the sample box 130 by utilizing the second power mechanism. This makes it simple and easy to operate the automatic sampling device 010 for heavy metal release from lake sediment to collect water samples of heavy metals released from the sediment.

[0029] Please refer to Figure 1 The sampling box 100 also includes a transition box 140. The water tank 120 and the sample box 130 are both arranged on the upper part of the transition box 140 and are connected to the transition box 140. A sampling port is provided at the lower part of the transition box 140. The filter paper 110 is connected to the transition box 140 to cover the sampling port. With such arrangement, during sampling, the water sample of the lake or river enters the transition box 140 after the particles are filtered out by the filter paper. The first power mechanism discharges the ultrapure water stored in the water tank 120 into the transition box 140 to form a water layer above the water sample of the lake or river in the transition box 140. The heavy metals in the bottom mud are released and diffused into the water layer. The water sample to be collected containing the heavy metals released from the bottom mud is then drawn into the sample box 130 by the second power mechanism.

[0030] It should be noted that the specification of the filter paper 110 can be selected as needed, for example, filter paper with a filtration specification of 0.45 μm can be selected, and no specific limitation is made here.

[0031] It should be noted that the first power mechanism is disposed inside the water tank 120 , and the second power mechanism is disposed inside the sample box 130 ; optionally, the first power mechanism and the second power mechanism are both water pumps.

[0032] Please refer to Figure 1The transition box 140 is provided with a balance port (not shown in the figure), and the automatic sampling device 010 for releasing heavy metals from lake sediments further comprises a balance valve 141, which is arranged on the transition box 140 and used to close or open the balance port; when the balance valve 141 opens the balance port, the balance port can make the inside and outside of the transition box 140 communicate with each other, so that water samples inside and outside the transition box 140 can enter and exit the transition box 140 through the balance port. Further, the water tank 120 and the sample box 130 are respectively arranged adjacent to the first end and the second end of the transition box 140, and the balance port is arranged at the second end of the transition box 140, that is, the balance port is arranged adjacent to the sample box 130. When using the automatic sampling device 010 for heavy metal release from lake sediment, the water tank 120 uses the first power mechanism to discharge ultrapure water into the transition box 140, and the balancing valve 141 opens the balancing port to discharge excess lake and river water entering the transition box 140 to maintain the balance in the sampling box 100, so that the ultrapure water discharged from the water tank 120 forms a water layer in the transition box 140, and the heavy metals in the sediment are released and diffused in the direction of the water layer, and can enter the water sample in the transition box 140 from the sampling port through the filter paper 110. After the heavy metals in the sediment are released for a period of time, the water sample containing the heavy metals released from the sediment in the transition box 140 is collected in the sample box 130 by the second power mechanism, so as to reliably realize the collection of heavy metals released and diffused in the sediment.

[0033] In this embodiment, a sample inlet (not shown) is provided at the bottom of the sample box 130, and the automatic sampling device 010 for releasing heavy metals from lake sediments further comprises a valve (hereinafter referred to as the first valve, not shown), which is provided in the sample box 130 for closing or opening the sample inlet. With such a configuration, when it is necessary to collect water samples, the sample inlet can be opened by using the first valve, so that the water sample can enter the sample box 130 through the opened sample inlet under the action of the second power mechanism; after the water sample is collected in the sample box 130 of the automatic sampling device 010 for releasing heavy metals from lake sediments, the sample inlet can be closed by using the first valve, so that the water sample is stored in the sample box 130, and then after the automatic sampling device 010 for releasing heavy metals from lake sediments is taken out from lakes and rivers, it can be ensured that the water sample in the sample box 130 does not flow out, so as to ensure the reliability of sampling.

[0034] Furthermore, the water tank 120 is provided with a water outlet (not shown in the figure), and the water outlet is connected to the water tank 120 and the transition box 140; the automatic sampling device 010 for releasing heavy metals from lake sediments also includes a second valve (not shown in the figure), which is arranged on the water tank 120 and used to open or close the water outlet. When the automatic sampling device 010 for releasing heavy metals from lake sediments is arranged at the bottom of lakes and rivers to collect heavy metals from sediments, the water outlet is opened by the second valve, so that the ultrapure water in the water tank 120 flows out of the water tank 120 from the water outlet under the action of the first power mechanism and enters the transition box 140, so as to form a water layer in the transition box 140; and before the automatic sampling device 010 for releasing heavy metals from lake sediments is lowered onto the sediments of lakes and rivers, the water outlet is closed by the second valve to prevent the water in the water tank 120 from flowing out in advance, thereby ensuring the reliability of sampling.

[0035] It should be noted that the above-mentioned balancing valve 141, the first valve and the second valve can all be solenoid valves to facilitate opening and closing control.

[0036] For further information, please refer to Figure 1 The automatic sampling device 010 for releasing heavy metals from lake sediments also includes a control device 174 and a power supply device 175. The control device 174 may be a programmable logic controller (PLC), etc., and the power supply device 175 may be a battery. The control device 174 is electrically connected to the power supply device 175, and the first power mechanism, the second power mechanism, the balancing valve 141, the first valve, and the second valve are all electrically connected to the control device 174, so as to use the power supply device 175 to provide power, and the operation of the first power mechanism and the second power mechanism can be controlled by the control device 174, and the opening and closing of the balancing valve 141, the first valve, and the second valve can be controlled by the control device 174. The control device 174 and the power supply device 175 can be fixedly connected to the top wall of the sampling box; of course, the positions where the control device 174 and the power supply device 175 are arranged are not specifically limited here.

[0037] It should be further explained that the control device 174 can also be a mobile terminal, such as a mobile phone, a tablet computer, etc., so that the user can control the opening and closing of the first power mechanism, the second power mechanism, the balance valve 141, the first valve, and the second valve through the mobile terminal. The working principles of the control device 174 and the mobile terminal are similar to those of the related art and will not be repeated here.

[0038] Please refer to Figure 1 The automatic sampling device 010 for heavy metal release from lake sediment of this embodiment further includes a positioning mechanism 150, which is disposed at the bottom of the sampling box 100 and is used to fix the sampling box 100 on the sediment. In this way, the positioning mechanism 150 can be used to stably set the sampling box 100 at the bottom of the lake or river to ensure smooth sampling.

[0039] Furthermore, the positioning mechanism 150 includes a mud nail 151 and a driving assembly 152. The driving assembly 152 is arranged on the sampling box 100 and is in transmission connection with the mud nail 151, and is used to drive the mud nail 151 to extend or retract relative to the sampling box 100. When the automatic sampling device 010 for releasing heavy metals from lake sediments is placed at the bottom of a lake or river, the driving assembly 152 is used to drive the mud nail 151 to extend relative to the sampling box 100, so that the mud nail 151 penetrates into the sediment, so that the sampling box 100 is stably arranged on the sediment, that is, the sampling box 100 can maintain balance with the sediment, thereby ensuring the reliability of sampling; when the automatic sampling device 010 for releasing heavy metals from lake sediments needs to be placed in a lake or river or taken out of a lake or river, the driving assembly 152 can be used to drive the mud nail 151 to retract relative to the sampling box 100, thereby facilitating the movement of the automatic sampling device 010 for releasing heavy metals from lake sediments.

[0040] It should be noted that the driving assembly 152 can be selected as needed, for example, it can be an electric push rod, a hydraulic cylinder, etc., which can drive the mud nail 151 to move linearly so that the mud nail 151 extending relative to the sampling box 100 can penetrate the bottom mud, and no specific limitation is made here. The driving assembly 152 can be fixedly connected to the sampling box 100 by fasteners such as bolts, or the driving assembly 152 can also be clamped or welded to the sampling box 100.

[0041] It should be further explained that the drive assembly 152 can be electrically connected to the control device 174 and the power supply device 175 at the same time, so as to utilize the power supply device 175 to provide electrical energy, and the drive assembly 152 can be controlled by the control device 174 to drive the mud nail 151 to extend or retract relative to the sampling box 100.

[0042] The number of positioning mechanisms 150 can be selected as needed. The sampling box 100 of this embodiment is provided with four groups of positioning mechanisms 150, and the four groups of positioning mechanisms 150 are arranged at intervals to improve the stability of the sampling box 100 when it is set on the bottom mud.

[0043] Of course, in other embodiments, the number of the positioning mechanisms 150 may be one, two, three, etc., which is not specifically limited here.

[0044] Please refer to Figure 1 The automatic sampling device 010 for heavy metal release from lake sediment also includes a detection member 160, which is disposed at the bottom of the sampling box 100 and is electrically connected to the positioning mechanism 150. The detection member 160 is used to control the positioning mechanism 150 to fix the sampling box 100 on the sediment when the bottom of the sampling box 100 contacts the sediment. With such a configuration, the positioning mechanism 150 can be controlled to fix the sampling box 100 quickly and sensitively.

[0045] Furthermore, the detection member 160 is electrically connected to the control device 174, that is, the detection member 160 is electrically connected to the driving component 152 of the positioning mechanism 150 through the control device 174. When the detection member 160 contacts the bottom mud, the detection member 160 generates a detection signal to the control device 174. The control device 174 can control the driving component 152 to drive the mud nail 151 to extend relative to the sampling box 100 and penetrate into the bottom mud according to the detection signal.

[0046] The detection element 160 can be various types of sensors, such as ranging sensors, photoelectric sensors, etc. Taking the ranging sensor as an example, when the ranging sensor detects that the distance between the sampling box 100 and the bottom mud is a preset value, for example: 0, the ranging sensor sends a detection signal to the control device 174.

[0047] It should be noted that in the process of lowering the automatic sampling device 010 for releasing heavy metals from lake sediment to the bottom of lakes and rivers, the lake water or river water enters the transition box 140 through the sampling port after being filtered by the filter paper 110; when the detection member 160 contacts the sediment, the detection member 160 generates a detection signal to the control device 174, and the control device 174 can control the driving component 152 to drive the mud nail 151 to extend relative to the sampling box 100 according to the detection signal. After the mud nail 151 is inserted into the sediment, the control device 174 controls the balancing valve to open the balancing port, and at the same time controls the second valve to open the water outlet, and at the same time controls the first power mechanism to discharge the ultrapure water in the water tank 120 into the transition box 140. The transition box 140 is used to form a water layer in the transition box 140. The heavy metals released from the bottom mud diffuse into the water sample in the transition box 140 from the sampling port through the filter paper 110. After a period of time (for example, 3 minutes, 5 minutes), the control device 174 controls the first valve to open, and at the same time controls the second power mechanism to draw the water in the transition box into the sample box 130, and collects a preset milliliter of water sample (for example, 10 mL) at a time, at a certain interval (for example, 3 seconds), and collects in this way for several times (for example, 20 times). Then the control device 174 controls the second power mechanism to stop, and at the same time controls the first valve to close, and the sampling is completed.

[0048] Optionally, see Figure 2 The automatic sampling device 010 for heavy metal release from lake sediment also includes a float 171, which is arranged on the sampling box 100. This arrangement facilitates the use of the float 171 to determine the position of the automatic sampling device 010 for heavy metal release from lake sediment when the automatic sampling device 010 for heavy metal release from lake sediment is placed on the bottom of a lake or a river.

[0049] Optionally, see Figure 2A rope hook 172 is provided on the top of the sampling box 100; the rope hook 172 can be used to set a traction rope 173, so that the traction rope 173 can be used to tow the sampling box 100, which is convenient for setting the sediment sampling device on the bottom of the lake or river, and is more convenient for removing the lake sediment heavy metal release automatic sampling device 010 after sampling.

[0050] Furthermore, the traction rope 173 is detachably connected to the rope hook 172 , so as to facilitate the replacement and storage of the traction rope 173 .

[0051] Please note that, please refer to Figure 2 The float 171 can be connected to the traction rope 173 to simplify the device and facilitate assembly.

[0052] The working principle of the automatic sampling device 010 for heavy metal release from lake sediment provided in this embodiment includes: using a traction rope 173 to lower the sampling box 100 to the bottom of a lake or a river, so that the lake water or the river water enters the transition box 140 from the sampling port after being filtered by the filter paper 110; when the detection component 160 detects that the bottom of the sampling box 100 is in contact with the sediment, the control device 174 drives the assembly 152 to drive the mud nail 151 to extend relative to the sampling box 100 to penetrate into the sediment, so that the sampling box 100 and the sediment are kept in balance; after standing for a period of time, the balancing valve 141 is controlled to open the balancing port, and the second valve is controlled to open the water outlet, and at the same time, the first power mechanism is controlled to discharge the ultrapure water in the water tank 120, a water layer is formed in the transition box 140, and the heavy metals released from the sediment diffuse into the water layer; then, the control device 174 controls the first valve to open the sample inlet, and at the same time, the second power mechanism is controlled to collect the water sample containing heavy metals released from the sediment in the transition box 140 into the sample box 130; then, the first valve is controlled to close the sample inlet to complete the sampling.

[0053] In summary, the automatic sampling device 010 for heavy metal release from lake sediment provided by the present invention utilizes the principle of heavy metal diffusion from high concentration to low concentration, so that the heavy metals released from the sediment enter the water sample in the sampling box 100, and utilizes the second power mechanism to collect the water sample containing the heavy metals released from the sediment into the sample box 130, thereby making the operation of the automatic sampling device 010 for heavy metal release from lake sediment simple and easy to operate for collecting heavy metals.

[0054] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An automatic sampling device for heavy metal release from lake sediment, used to be placed at the bottom of lakes and rivers to collect heavy metals in sediment, characterized in that: The automatic sampling device for heavy metal release from lake sediment comprises a sampling box, filter paper, a first power mechanism and a second power mechanism. A sampling port is provided at the bottom of the sampling box. The filter paper is provided at the sampling box to cover the sampling port so as to filter particulate matter in the water sample flowing into the sampling box. The sampling box includes a water tank and a sample box arranged above the sampling port, the water tank is used to store ultrapure water, the first power mechanism is arranged in the water tank, and is used to discharge the ultrapure water in the water tank, and the second power mechanism is arranged in the sample box, and is used to draw a water sample containing heavy metals released from the bottom mud into the sample box when the first power mechanism discharges the ultrapure water in the water tank.

2. The automatic sampling device for heavy metal release from lake sediment according to claim 1, characterized in that: The sampling box also includes a transition box. The water tank and the sample box are both arranged at the upper part of the transition box and are connected to the transition box. The sampling port is opened at the lower part of the transition box.

3. The automatic sampling device for heavy metal release from lake sediment according to claim 1, characterized in that: A sample inlet is arranged at the bottom of the sample box, and the automatic sampling device for heavy metal release from lake sediment also includes a valve, which is arranged on the sample box and is used to close or open the sample inlet.

4. The automatic sampling device for heavy metal release from lake sediment according to claim 3, characterized in that: The valve is a solenoid valve.

5. The automatic sampling device for heavy metal release from lake sediment according to claim 1, characterized in that: The automatic sampling device for heavy metal release from lake sediment also includes a positioning mechanism, which is arranged at the bottom of the sampling box and is used to fix the sampling box on the sediment.

6. The automatic sampling device for heavy metal release from lake sediment according to claim 5, characterized in that: The positioning mechanism includes a mud nail and a driving assembly. The driving assembly is arranged on the sampling box and is drivingly connected to the mud nail for driving the mud nail to extend or retract relative to the sampling box.

7. The automatic sampling device for heavy metal release from lake sediment according to claim 5, characterized in that: The automatic sampling device for heavy metal release from lake sediment also includes a detection component, which is arranged at the bottom of the sampling box and is electrically connected to the positioning mechanism. The detection component is used to control the positioning mechanism to fix the sampling box on the sediment when the bottom of the sampling box contacts the sediment.

8. The automatic sampling device for heavy metal release from lake sediment according to claim 1, characterized in that: The automatic sampling device for heavy metal release from lake sediment also includes a float, which is arranged in the sampling box.

9. The automatic sampling device for heavy metal release from lake sediment according to claim 1, characterized in that: A rope hook is arranged on the top of the sampling box.

10. The automatic sampling device for heavy metal release from lake sediment according to claim 9, characterized in that: The rope hook is detachably connected with a traction rope.

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