Liquid sampling device, sampling method and application

Abstract

The invention relates to a liquid sampling device, a sampling method and application. The liquid sampling device comprises an inner cabin door opening and closing module and a sampling movement module which are positioned in the sealed box body; the inner cabin door opening and closing module comprises an inner cabin, an inner cabin door and a lifting support. The inner cabin fixedly penetrates through the bottom of the sealed box body, and an opening of the inner cabin corresponds to the inner cabin door in position; the lifting support comprises a base and a lifting column which are connected with each other, the base is fixedly arranged in the sealed box, and the lifting column is connected with the inner cabin door in a penetrating mode. According to the liquid sampling device, the inner cabin door can be lifted parallel to the opening of the inner cabin, and the sampling movement module is lifted together, so that a certain opening distance is formed between the inner cabin door and the opening of the inner cabin, and a sampling container can be conveniently taken and hung in a relatively open space.

Description

Technical Field

[0001] The invention relates to a liquid sampling device, a sampling method and an application. Background Art

[0002] As a fourth-generation nuclear reactor, the molten salt reactor uses molten salt as a coolant, so the composition of the molten salt in the reactor is directly related to the safe and stable operation of the experimental reactor. However, the molten salt in the experimental reactor has the characteristics of high temperature, strong corrosiveness, and high radioactivity, which makes sampling difficult. In addition, when sampling in the reactor, it is necessary to avoid introducing impurities into the reactor during the sampling process, and at the same time, the samples taken out should not be contaminated.

[0003] At present, there are two types of sampling devices for high-temperature radioactivity in the reactor. One is the capsule sampling device for molten salt reactors of Oak Ridge National Laboratory (ORNL) in the United States, and the other is "A sampling device for radioactive metal liquids" (patent number CN 211627032U) of China General Nuclear Power Corporation, which is used for high-temperature liquid metal sampling. ORNL's capsule sampling device is located far away from the experimental reactor. The sampling device is connected to the reactor through an oblique sampling pipeline and separated by a valve. When sampling, the capsule is mounted on the sampling device by a manipulator, and then the valve is opened. The motor in the sampling device rotates and lowers the wire rope to put the capsule into the reactor; after the sampling is completed, the motor in the sampling device rotates in the opposite direction to retract the wire rope and lift the capsule back into the sampling device, and then the manipulator removes the capsule to complete the sampling process. In the sampling device of CGN, the sampling mechanism is directly set above the pile. The lead shielding tank and the sampling piece are sent to the bottom of the sampling mechanism through the motion mechanism. The sampling mechanism is remotely operated to complete the sampling, and then the sampled piece is sent back to the sampling room or safe area through the conveying mechanism. From the above introduction, it can be seen that to carry out high-temperature radioactive sampling, the personnel operation area must be far away from the sampling point. In the device of ORNL, the sampling device is far away from the sampling point, and the sampling device and the sampling point are connected by a pipeline; in the device of CGN, the sampling mechanism is above the sampling point, and the sample taken is sent to the distant sampling room through the track and the conveying mechanism. The sampling mechanism of CGN is placed near the sampling point. If the sampling mechanism equipment fails and maintenance is required, it is difficult for personnel to reach and maintain due to the high temperature and high radioactive working environment near the sampling point; in addition, the space inside the molten salt reactor is small, and there are many equipments that need to be moved, and there is not enough space to install the sampling mechanism at a close distance. Therefore, sampling in the molten salt reactor will adopt the ORNL device model, that is, the sampling mechanism is placed far away from the sampling point, and the capsule is transported to the sampling point through an inclined sampling pipe to complete the sampling.

[0004] There are still the following problems when directly using ORNL's device to take samples inside the molten salt reactor: one is the capsule positioning problem. When sampling, the capsule can be immersed below the molten salt liquid level while the wire rope cannot touch the molten salt. Considering the fluctuation of the molten salt liquid level when the molten salt pump in the reactor is running, a chain that can be immersed in the molten salt and can be bent will be connected between the wire rope and the capsule. However, due to space limitations, the length of the chain is generally no more than 10 cm, and the sampling position is far away from the sampling device (more than 10 m). Coupled with the "black box" environment inside the reactor, how to ensure that the capsule can accurately descend to the appropriate position after multiple uses (more than 500 times) is undoubtedly a challenge; second, the problem of operational convenience. Due to the high radioactivity of the molten salt in the reactor, the sampling device needs to be placed in the hot chamber. ORNL uses a semi-sealed side-opening inner cabin structure. The inner cabin door is small and not convenient for manipulator operation. In addition, there is the problem of capsules falling into the inner cabin and being difficult to find; third, the problem of wire rope entanglement. In ORNL, there have been many cases where capsules were stuck in the pipeline, and the motor continued to lower the wire rope, resulting in the problem of wire rope entanglement; fourth, the problem of maintenance. The sampling device is placed in the hot chamber, and personnel cannot reach it directly, making it difficult to maintain the equipment when it fails. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome at least one of the defects of the prior art such as difficult positioning, difficult operation, wire rope winding and difficult maintenance, and to provide a liquid sampling device, a sampling method and an application.

[0006] The present invention solves the above technical problems through the following technical solutions:

[0007] In a first aspect, the present invention provides a liquid sampling device, which includes an inner door opening and closing module and a sampling motion module located in a sealed box; the inner door opening and closing module includes an inner cabin, an inner door and a lifting bracket;

[0008] The inner chamber is fixedly arranged at the bottom of the sealed box, and the opening of the inner chamber corresponds to the position of the inner door;

[0009] The lifting bracket comprises a base and a lifting column connected to each other, the base is fixed in the sealed box, and the lifting column is connected with the inner door through an interlaced manner;

[0010] The sampling motion module is fixedly mounted on a side of the inner door away from the inner chamber, and the sampling motion module comprises a liftable sampling hanging head, and the sampling hanging head can hang a sampling container;

[0011] The side of the inner chamber away from the inner door is connected to a sampling channel through an isolation valve. The sampling channel is located outside the sealed box body and connected to a liquid container to be sampled.

[0012] In the present invention, the sealed box can control the water oxygen content to ensure that the taken-out liquid will not be contaminated.

[0013] In the present invention, the liquid container is generally located more than ten meters underground.

[0014] In the present invention, the sampling channel can be arranged in an inclined, vertical or curved manner.

[0015] In the present invention, the liquid sampling device can be placed 10-15 meters above the liquid container, for example, at 0 meters above the ground.

[0016] In the present invention, the inner door opening and closing module may further include a lifting motor for driving the inner door to rise and fall along the lifting bracket.

[0017] In the present invention, the lifting columns may be four lead screws, which are respectively connected through the four corners of the inner door.

[0018] In the present invention, the lifting column may be provided with a limit switch to prevent the inner door from being over-tightened or out of range during the descending and ascending process.

[0019] In the present invention, the sampling motion module may further include a wire reel wound with a wire, and the wire is connected to the sampling hook. The wire may be made of a corrosion-resistant material, such as stainless steel, nickel-based alloy, nickel, gold, silver or platinum. The sampling hook may be made of a corrosion-resistant material, such as stainless steel, nickel-based alloy, nickel, gold, silver or platinum. The sampling motion module may further include a weight sensor, a pedometer or a motor for driving the wire reel.

[0020] The sampling motion module also includes a winding organizer, which makes the wires neatly stacked in the wire reel, ensures that the sampling container is repeatedly placed in the designated position, and then obtains the relationship between the motor rotation and the sampling container lowering distance through testing, solving the problem of sampling positioning.

[0021] In the present invention, the liquid sampling device further comprises a control module, which is connected to the sampling motion module by signal. The control module is used to read the reading of the weight sensor in the sampler motion module. When the sampling container is stuck in the sampling channel, the weight sensor will sense the change of the force on the wire and send a command to the motor to stop lowering the wire, thereby avoiding entanglement caused by excessive lowering of the wire.

[0022] In the present invention, the sampling container may be in the shape of a capsule.

[0023] In the present invention, the shape of the sampling hanging head can be a hook shape, a mushroom head shape or a quick-connect joint.

[0024] In the present invention, the liquid container may be a main container of a radioactive molten salt reactor, which is filled with radioactive molten salt of a reactor primary loop.

[0025] In the present invention, the liquid container may be a molten salt reactor cooling salt storage tank, which is filled with reactor secondary circuit cooling salt.

[0026] In the present invention, the liquid sampling device may further include a sampling tank module, which is used to open and seal the sampling tank containing the sampling container.

[0027] In the present invention, the liquid sampling device may further include a gas replacement module, and the gas replacement module includes an air inlet pipe and an air outlet pipe connected to the side wall of the inner chamber. The air inlet pipe is provided with an air inlet valve. The air outlet pipe is provided with an air outlet valve. The air outlet pipe is provided with a pressure sensor. The air outlet pipe is connected to a vacuum pump.

[0028] In a second aspect, the present invention provides a liquid sampling method, which uses the liquid sampling device as described above, comprising the following steps:

[0029] S1, keeping the isolation valve closed, hanging the sampling container on the sampling hanging head;

[0030] S2, lowering the inner door to the opening of the inner cabin;

[0031] S3, opening the isolation valve and lowering the sampling container to the liquid container for sampling;

[0032] S4. Raise the sampling container to a position higher than the isolation valve, and close the isolation valve.

[0033] In the present invention, the sampling device may further include a gas replacement module, and the gas replacement module includes an air inlet pipe and an air outlet pipe connected to the side wall of the inner chamber. Step S1 is specifically as follows: keep the isolation valve closed, lower the inner chamber door to the opening of the inner chamber, evacuate the inner chamber to a vacuum, then introduce an inert gas into the inner chamber, raise the inner chamber door, and hang the sampling container on the sampling hanger. The inert gas may be argon. Introduce the inert gas into the inner chamber until the pressure in the inner chamber is higher than the pressure of the sealed box.

[0034] In the present invention, the sampling device may further include a sampling tank module. In step S1, the sampling container is obtained from the sampling tank module.

[0035] In the present invention, in step S1, the sampling container can be weighed and then hung on the sampling hanging head.

[0036] In the present invention, in step S2, before lowering the inner cabin door, a temporary baffle may be placed at the opening of the inner cabin to prevent the sampling container from falling into the inner cabin.

[0037] In the present invention, the sampling device may further include a gas replacement module, the gas replacement module includes an air inlet pipe and an air outlet pipe connected to the side wall of the inner chamber, and in step S3, before the isolation valve is opened, the inner chamber is evacuated to a vacuum, and then an inert gas is introduced into the inner chamber. The inert gas may be argon. The inert gas is introduced into the inner chamber until the pressure in the inner chamber is higher than the pressure of the liquid container.

[0038] In the present invention, the sampling device may further include a gas replacement module, the gas replacement module includes an air inlet pipe and an air outlet pipe connected to the side wall of the inner chamber, and in step S4, after the isolation valve is closed, the inner chamber is evacuated to a vacuum, and then an inert gas is introduced into the inner chamber. The inert gas may be argon. The inert gas is introduced into the inner chamber until the pressure in the inner chamber is higher than the pressure of the sealed box.

[0039] In the present invention, in step S4, after the isolation valve is closed, the inner door is raised, and the sampling container is raised to leave the inner chamber.

[0040] In a third aspect, the present invention provides an application of the liquid sampling device as described above, which is applied to sampling of radioactive molten salt in the primary loop of a reactor or cooling salt in the secondary loop of a reactor;

[0041] When used for sampling radioactive molten salt in the first loop of a reactor, the inner door opening and closing module and the sampling movement module are located in the hot chamber.

[0042] The positive and progressive effects of the present invention are:

[0043] (1) The sampling device of the present invention adopts a modular design, and the vulnerable parts or parts that are difficult to replace of each module are designed to be convenient for disassembly and assembly by a robot, which is convenient for maintenance;

[0044] (2) In the sampling device of the present invention, the inner door can be raised parallel to the inner chamber opening, and the sampling motion module is raised together, so that there is an open distance between the inner door and the inner chamber opening, which is convenient for the sampling container to be hung in a relatively open space;

[0045] (3) The control module of the sampling device of the present invention has a jam warning function. When the sampling container is jammed, the motor will immediately stop lowering the wire, thus avoiding the problem of wire entanglement;

[0046] (4) The sampling device of the present invention can accurately lower the sampling container. As long as the relationship between the rotation of the motor and the lowering distance of the sampling container is obtained through preliminary testing, the sampling device can ensure the lowering accuracy during subsequent repeated use;

[0047] (5) The sampling device of the present invention can accurately lower the sampling container and avoid the problem of wire entanglement. Therefore, it can be installed near the ground surface, which is convenient for maintenance and operation.

[0048] (6) In the sampling method of the present invention, a temporary baffle may be provided before the sampling container enters the inner chamber to prevent the sampling container from falling into the inner chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 This is a schematic diagram of the liquid sampling device in Example 1;

[0050] As shown in the figure: sampling movement module 1, inner cabin door 2, sampling container 3, sampling tank module 4, inner cabin 5, air inlet valve 6, isolation valve 7, pressure sensor 8, air outlet valve 9, vacuum pump 10, lifting motor 11, lifting bracket 12, sealed box 13, sampling channel 14, liquid container 15. DETAILED DESCRIPTION

[0051] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples.

[0052] Example 1

[0053] A liquid sampling device, such as Figure 1 , including an inner door opening and closing module and a sampling movement module 1 located in a sealed box 13; the inner door opening and closing module includes an inner cabin 5, an inner door 2 and a lifting bracket 12;

[0054] The sampling motion module 1, the inner door 2 and the lifting bracket 12 are located in the sealed box 13; the inner chamber 5 is fixedly arranged at the bottom of the sealed box 13, and the opening of the inner chamber 5 corresponds to the position of the inner door 2;

[0055] The lifting bracket 12 includes a base and a lifting column connected to each other, the base is fixed in the sealed box 13, and the lifting column is connected with the inner door 2 through an interlaced manner;

[0056] The sampling motion module 1 is fixedly mounted on a side of the inner door 2 away from the inner chamber 5. The sampling motion module 1 comprises a liftable sampling hanging head, and the sampling hanging head can hang a sampling container 3.

[0057] The side of the inner chamber 5 away from the inner door 2 is connected to the sampling channel 14 through the isolation valve 7. The sampling channel 14 is located outside the sealed box 13 and connected to the liquid container 15 to be sampled.

[0058] In this embodiment, the sealed box 13 is a closed space that can control the water and oxygen content to ensure that the liquid taken out will not be contaminated. The liquid container 15 is generally located more than ten meters underground. The liquid sampling device is placed near the surface. The sampling channel 14 is inclined or vertically arranged. In this embodiment, the inner door 2 is above the inner cabin 5, and the inner door 2 is lifted and lowered along the lifting bracket 12 to realize the opening and closing of the inner door 2. At the same time, the sampling motion module 1 is installed on the inner door 2. When the inner door 2 is raised, the sampling motion module 1 is also raised together. Even if the volume of the inner cabin 5 is small, the sampling container 3 on the sampling motion module 1 is directly exposed in the sealed box 13 as the inner door 2 is raised, which is convenient for the robot to operate and hang.

[0059] In this embodiment, the inner door opening and closing module further includes a lifting motor 11 for driving the inner door 2 to rise and fall along the lifting bracket 12. In this embodiment, the lifting columns are four lead screws, which are respectively connected to the four corners of the inner door 2. A limit switch is provided on the lifting column to prevent the inner door 2 from being over-tightened or out of range during the descent and ascent process.

[0060] In the present embodiment, the sampling motion module 1 also includes a wire reel wound with a silk thread, and the silk thread is connected to the sampling head. The silk thread and the sampling head are made of stainless steel. The sampling motion module 1 also includes a motor for driving the wire reel. The sampling container 3 is in the shape of a capsule. The sampling head is in the shape of a mushroom head. In the present embodiment, the sampling motion module 1 also includes a winding organizer to stack the silk thread neatly in the wire reel, to ensure that the sampling container 3 is repeatedly lowered to the specified position with repeatability, and then the relationship between the motor rotation and the lowering distance of the sampling container 3 is obtained by testing, thereby solving the problem of sampling positioning.

[0061] In this embodiment, the sampling device further includes a control module, which is connected to the sampling motion module 1 by signals. The control module is used to read the reading of the weight sensor in the sampler motion module 1. When the sampling container 3 is stuck in the sampling channel 14, the weight sensor will sense the change of the force on the wire and send a command to the motor to stop lowering the wire, thereby avoiding entanglement caused by excessive lowering of the wire.

[0062] In this embodiment, the sampling device further includes a gas replacement module, which includes an air inlet pipe and an air outlet pipe connected to the side wall of the inner chamber 5. The air inlet pipe is provided with an air inlet valve 6. The air outlet pipe is provided with an air outlet valve 9. The air outlet pipe is provided with a pressure sensor 8. The air outlet pipe is connected to a vacuum pump 10.

[0063] Example 2

[0064] A method for sampling high-temperature molten salt in a reactor, using the liquid sampling device in Example 1, is used to sample on the main container of a 2MWt liquid fuel thorium-based molten salt experimental reactor. At this time, the inner hatch opening and closing module and the sampling movement module are located in the hot chamber, the sampling channel 14 is tilted, and the liquid container 15 is the main container of the radioactive molten salt reactor. The specific operation is as follows:

[0065] S1. Keep the isolation valve 7 closed, and cover the inner door 2 on the top of the inner cabin 5, so that the inner cabin 5 is in a sealed state, close the air inlet valve 6, open the air outlet valve 9 and the vacuum pump 10 to extract the gas from the inner cabin 5, then close the air outlet valve 9, open the air inlet valve 6, fill argon gas into the inner cabin 5, and judge that the pressure of the inner cabin 5 is slightly higher than the pressure of the sealed box 13 according to the pressure sensor 8, and complete the gas replacement; then make the lifting motor 11 drive the lead screw of the lifting bracket 12 to rotate, lift the inner door 2 to a suitable position, operate the manipulator to take out the capsule-shaped sampling container 3 from the sampling tank module 4, weigh it, and hang it on the sampling hanging head;

[0066] S2, lowering the inner door 2 to the opening of the inner cabin 5 to seal the inner cabin 5;

[0067] S3, close the air inlet valve 6, open the air outlet valve 9 and the vacuum pump 10 to extract the gas from the inner chamber 5, then close the air outlet valve 9, open the air inlet valve 6, fill the inner chamber 5 with argon gas, and judge that the pressure of the inner chamber 5 is slightly higher than the pressure of the liquid container 15 according to the pressure sensor 8, and complete the gas replacement; then open the isolation valve 7, and lower the sampling container 3 to the liquid container 15 for sampling;

[0068] S4, lift the sampling container 3 to a position higher than the isolation valve 7, close the isolation valve 7; close the inlet valve 6, open the outlet valve 9 and the vacuum pump 10 to extract the gas from the inner chamber 5, then close the outlet valve 9, open the inlet valve 6, fill the inner chamber 5 with argon gas, and judge that the pressure of the inner chamber 5 is slightly higher than the pressure of the sealed box 13 according to the pressure sensor 8, and complete the gas replacement; then make the lifting motor 11 drive the lead screw of the lifting bracket 12 to rotate, lift the inner door 2, and then lift the sampling container 3 to leave the inner chamber 5. Operate the manipulator to remove the sampling container 3 after sampling, weigh it, put it into the sampling tank, and send it into the sampling tank module 4 to complete the whole sampling process.

[0069] In this embodiment, the above method has been used to take out more than 30 high-temperature molten salt samples from the reactor main container to ensure that no gas and other impurities are introduced into the reactor during the sampling process. At the same time, the taken samples will not absorb moisture and oxygen in the air, thereby ensuring the sampling quality.

[0070] Example 3

[0071] A molten salt reactor cooling salt sampling method is provided, wherein the liquid sampling device in Example 1 is used to sample the molten salt reactor cooling salt storage tank of a 2MWt liquid fuel thorium-based molten salt experimental reactor, wherein the sealed box 13 is a glove box, the sampling channel 14 is vertically arranged, and the liquid container 15 is the molten salt reactor cooling salt storage tank, and the specific operation is as follows:

[0072] S1. Keep the isolation valve 7 closed, and cover the inner door 2 on the top of the inner cabin 5, so that the inner cabin 5 is in a sealed state, close the air inlet valve 6, open the air outlet valve 9 and the vacuum pump 10 to extract the gas from the inner cabin 5, then close the air outlet valve 9, open the air inlet valve 6, fill argon gas into the inner cabin 5, and judge that the pressure of the inner cabin 5 is slightly higher than the pressure of the sealed box 13 according to the pressure sensor 8, and complete the gas replacement; then make the lifting motor 11 drive the lead screw of the lifting bracket 12 to rotate, lift the inner door 2 to a suitable position, manually take out the capsule-shaped sampling container 3 from the sampling tank module 4, weigh it, and hang it on the sampling hanging head;

[0073] S2, lowering the inner door 2 to the opening of the inner cabin 5 to seal the inner cabin 5;

[0074] S3, close the air inlet valve 6, open the air outlet valve 9 and the vacuum pump 10 to extract the gas from the inner chamber 5, then close the air outlet valve 9, open the air inlet valve 6, fill the inner chamber 5 with argon gas, and judge that the pressure of the inner chamber 5 is slightly higher than the pressure of the liquid container 15 according to the pressure sensor 8, and complete the gas replacement; then open the isolation valve 7, and lower the sampling container 3 to the liquid container 15 for sampling;

[0075] S4, lift the sampling container 3 to a position higher than the isolation valve 7, close the isolation valve 7; close the inlet valve 6, open the outlet valve 9 and the vacuum pump 10 to extract the gas from the inner chamber 5, then close the outlet valve 9, open the inlet valve 6, fill the inner chamber 5 with argon gas, and judge that the pressure of the inner chamber 5 is slightly higher than the pressure of the sealed box 13 according to the pressure sensor 8, and complete the gas replacement; then make the lifting motor 11 drive the lead screw of the lifting bracket 12 to rotate, lift the inner door 2, and then lift the sampling container 3 to leave the inner chamber 5. Manually remove the sampling container 3 after sampling, weigh it, put it into the sampling tank, and send it into the sampling tank module 4 to complete the whole sampling process.

[0076] In this embodiment, the above method has been used to take out more than 10 high-temperature molten salt samples from the cooling salt storage tank of the molten salt reactor to ensure that no gas and other impurities are introduced into the reactor during the sampling process. At the same time, the taken samples will not absorb moisture and oxygen in the air, thereby ensuring the sampling quality.

[0077] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that this is only for illustration and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A liquid sampling device, characterized in that: It includes an inner door opening and closing module and a sampling movement module located in a sealed box; the inner door opening and closing module includes an inner cabin, an inner door and a lifting bracket; The inner chamber is fixedly arranged at the bottom of the sealed box, and the opening of the inner chamber corresponds to the position of the inner door; The lifting bracket comprises a base and a lifting column connected to each other, the base is fixed in the sealed box, and the lifting column is connected with the inner door through an interlaced manner; The sampling motion module is fixedly mounted on a side of the inner door away from the inner chamber, and the sampling motion module comprises a liftable sampling hanging head, and the sampling hanging head can hang a sampling container; The side of the inner chamber away from the inner door is connected to a sampling channel through an isolation valve. The sampling channel is located outside the sealed box body and connected to a liquid container to be sampled.

2. The liquid sampling device according to claim 1, characterized in that: The liquid container is located underground; The sampling channel is arranged obliquely, vertically or curvedly; The liquid sampling device is placed 10-15 m above the liquid container, for example, at 0 m above the ground.

3. The liquid sampling device according to claim 1, characterized in that: The inner door opening and closing module also includes a lifting motor for driving the inner door to rise and fall along the lifting bracket; The lifting columns are four lead screws, which are respectively connected with the four corners of the inner door; The lifting column is provided with a limit switch; The sampling container is in the shape of a capsule; The sampling container is made of corrosion-resistant material, such as stainless steel, nickel-based alloy, nickel, gold, silver or platinum; The shape of the sampling hook is a hook, a mushroom head or a quick-connect joint; The liquid sampling device also includes a sampling tank module.

4. The liquid sampling device according to claim 1, characterized in that: The liquid sampling motion module also includes a wire reel wound with a wire, and the wire is connected to the sampling hook; The wire is made of corrosion-resistant material, such as stainless steel, nickel-based alloy, nickel, gold, silver or platinum; The sampling head is made of corrosion-resistant material, such as stainless steel, nickel-based alloy, nickel, gold, silver or platinum; The sampling motion module also includes a weight sensor, a pedometer, or a motor for driving the reel; The sampling motion module also includes a wire winding organizer.

5. The liquid sampling device according to claim 1, characterized in that: The liquid sampling device further comprises a control module, and the control module is connected to the sampling motion module by signal.

6. The liquid sampling device according to claim 1, characterized in that: The liquid sampling device further comprises a gas replacement module, wherein the gas replacement module comprises an air inlet pipe and an air outlet pipe connected to the side wall of the inner chamber; The air intake pipe is provided with an air intake valve; The air outlet pipe is provided with an air outlet valve; The air outlet pipe is provided with a pressure sensor; The air outlet pipeline is connected with a vacuum pump.

7. A liquid sampling method, characterized in that: The liquid sampling device according to any one of claims 1 to 6 is used, comprising the following steps: S1, keeping the isolation valve closed, hanging the sampling container on the sampling hanging head; S2, lowering the inner door to the opening of the inner cabin; S3, opening the isolation valve and lowering the sampling container to the liquid container for sampling; S4. Raise the sampling container to a position higher than the isolation valve, and close the isolation valve.

8. The liquid sampling method according to claim 7, characterized in that: The liquid sampling device also includes a gas replacement module, which includes an air inlet pipe and an air outlet pipe connected to the side wall of the inner chamber. Step S1 specifically includes: keeping the isolation valve closed, lowering the inner chamber door to the opening of the inner chamber, evacuating the inner chamber to a vacuum, then introducing an inert gas into the inner chamber, and then raising the inner chamber door, and hanging the sampling container on the sampling hanging head; the inert gas is argon; introducing the inert gas into the inner chamber until the pressure in the inner chamber is higher than the pressure of the sealed box; The liquid sampling device further comprises a sampling tank module, and in step S1, the sampling container is obtained from the sampling tank module; In step S1, the sampling container is weighed and then hung on the sampling hanging head; In step S2, before lowering the inner cabin door, a temporary baffle may be placed at the opening of the inner cabin.

9. The liquid sampling method according to claim 7, characterized in that: The liquid sampling device further comprises a gas replacement module, and the gas replacement module comprises an air inlet pipe and an air outlet pipe connected to the side wall of the inner chamber. In step S3, before the isolation valve is opened, the inner chamber is evacuated to a vacuum, and then an inert gas is introduced into the inner chamber; the inert gas is argon; the inert gas is introduced into the inner chamber until the pressure in the inner chamber is higher than the pressure of the liquid container; The liquid sampling device further comprises a gas replacement module, and the gas replacement module comprises an air inlet pipe and an air outlet pipe connected to the side wall of the inner chamber. In step S4, after the isolation valve is closed, the inner chamber is evacuated to a vacuum, and then an inert gas is introduced into the inner chamber; the inert gas is argon; the inert gas is introduced into the inner chamber until the pressure in the inner chamber is higher than the pressure of the sealed box; In step S4, after the isolation valve is closed, the inner door is raised, and the sampling container is raised to leave the inner chamber.

10. Use of the liquid sampling device according to any one of claims 1 to 6, characterized in that: It is used for sampling radioactive molten salt in the first loop of reactor or cooling salt in the second loop of reactor; When used for sampling radioactive molten salt in the first loop of a reactor, the inner door opening and closing module and the sampling movement module are located in the hot chamber.

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