A sampling device for in-situ sampling, cutting and injection of seabed sediments

Abstract

The present invention relates to the field of marine equipment, and aims to provide a sampling device for in-situ sampling, cutting and injection of seabed sediments. The device includes a sampling displacement system, a sampler, a cutting and sealing system and an injection system; the sampling displacement system includes a sampling motor, a screw and a gear set; the sampler includes a sampling inner cylinder and a sampling outer cylinder, the former being made of plastic; the cutting and sealing system includes a cutting knife, a cutting motor, a connecting plate and a sealing assembly; the sealing assembly is arranged at the intervals between each section of the sampling outer cylinder; the number of the cutting knives is consistent with the rubber seal and is arranged in sequence along the axial direction of the sampler; the injection system includes an injection device, an injection channel and an injection port. The sampling device of the present invention can perform cutting and injection operations in situ after sampling the seabed, and uses the cutting and sealing system for cutting and long-term sealing, thereby avoiding the sediments at different positions and the microorganisms therein from settling, flowing, moving or diffusing with each other during the long-term static storage of the sample.

Description

Technical Field

[0001] The present invention relates to the field of marine equipment, and more particularly to a sampling device for in-situ sampling, cutting and injection of seabed sediments. Background Art

[0002] During submarine mining operations, plumes of sediment are formed and dispersed, impacting the marine environment. By sampling the redeposited layer of submarine sediment from mining areas and injecting a fixative solution, researchers can conduct experimental studies on the soil layers and microorganisms within the sediments, thereby determining the impact of construction activities on submarine microorganisms.

[0003] However, sampling seafloor sediments requires extremely low disturbance. Conventional seafloor sediment sampling devices typically use a petal sampler at the sampler's opening. During the sampling process, sediment is forced through the petal structure, causing destructive disturbance and damage to the sediment. Because this "stirring" effect actually occurs, such sampling methods simply cannot meet the low-disturbance requirements of subsequent experimental research.

[0004] Furthermore, because seabed mining construction is an ongoing activity, the associated sampling process takes a relatively long time. Typically, multiple sampling devices are deployed throughout the operation, with sampling performed remotely or automatically at preset intervals. Finally, all sampling devices are retrieved simultaneously back to the mothership. Researchers slice and layer the sample from each sampler, observing and studying the accumulation relationships and interactions between the redeposited layers and the original sedimentary layers, and investigating the distribution of microorganisms within each sediment layer. This approach eliminates the need for a recovery operation after each sample is collected, eliminating the need for the mothership to remain stationary, and significantly reducing workload. However, because seabed mining construction typically lasts for dozens of days, samples collected at different times must remain on the seabed for retrieval, with the earliest samples sometimes remaining in situ for dozens of days. This results in varying degrees of sedimentation and diffusion within each sampler, and the movement of microorganisms within the sediment, causing the samples to deviate from the original sediment and its ecosystem to varying degrees, severely interfering with experimental results and potentially deviating conclusions from reality.

[0005] Therefore, proposing a new seabed sediment sampling device is very consistent with actual needs. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to overcome the deficiencies in the prior art and provide a sampling device for in-situ sampling, cutting and injection of seabed sediments.

[0007] To solve the technical problem, the solution of the present invention is:

[0008] A sampling device for in-situ sampling, cutting and injection of seabed sediments is provided, which is characterized by comprising a sampling displacement system, a sampler, a cutting and sealing system and an injection system; wherein,

[0009] The sampling displacement system includes a sampling motor, a lead screw and a gear set; the gear set includes at least two gears, one of which is fixedly mounted on the output end of the sampling motor and the other is meshingly sleeved on the lead screw; the sampling motor can drive the lead screw to move up and down in the vertical direction through the gear set;

[0010] The sampler comprises an inner sampling cylinder and an outer sampling cylinder; the inner sampling cylinder is made of plastic, with a closed top and an open bottom; the outer sampling cylinder is made of metal and is divided into several sections, which are fixed to the outside of the inner sampling cylinder from top to bottom, with adjacent sections maintaining the same spacing; a closing mechanism for closing the sampler opening is provided at the bottom of the outer sampling cylinder; the bottom end of the screw rod is connected to the top end of the sampler;

[0011] The cutting sealing system includes a cutting knife, a cutting motor, a connecting plate, and a sealing assembly. The cutting knife includes a plate-type cutting knife head and a handle-shaped cutting knife shaft, with the blade located on the side opposite the cutting knife shaft. The cutting motor is a watertight electric push rod, the output end of which is connected to the cutting knife shaft via a connecting plate. The sealing assembly includes several rubber seals, which are respectively located at the intervals between each section of the sampling outer cylinder. The number of the cutting knives is the same as the number of rubber seals, and they are arranged in sequence along the axial direction of the sampler. The cutting knife heads are all horizontally oriented with the blades facing the rubber seals. The inner side of the rubber seals has a groove that adapts to the shape of the cutting knife head edge.

[0012] The injection system includes an injection device, an injection channel, and an injection port. The number of injection ports is the same as that of the sealing assembly and is respectively provided on the side wall of the sampler above each rubber seal. One end of the injection channel is connected to the injection device, and the other end is connected to the interior of the sampler through each injection port.

[0013] The outer cylinder is used to load or install the aforementioned sampling displacement system, sampler, cutting sealing system and injection system; a vertical through groove with a shape matching that of the sampler is provided in the outer cylinder, and the sampler is movably installed therein.

[0014] As a preferred embodiment of the present invention, there are two sets of samplers, cutting sealing systems, injection channels and outer cylinders, and the two outer cylinders are fixedly connected by a base plate and a crossbeam. Each outer cylinder is loaded or installed with a set of samplers, cutting sealing systems and injection channels; the cutting motor and injection device are fixed on the base plate between the two outer cylinders, wherein the cutting motor is connected to the middle part of the connecting plate, and the knife shafts of each cutting knife in the two sets of cutting sealing systems are respectively connected to the two sides of the connecting plate.

[0015] As a preferred embodiment of the present invention, the open end of the sampler extends out of the bottom of the outer cylinder, and a rotating shaft is provided on the central axis of the open end; the two rotary valve plates in the closing mechanism are movably mounted on the rotating shaft with their side edges, and a torsion spring for closing the two rotary valve plates is provided on the rotating shaft;

[0016] A tensioning rope is provided on each of the two rotary valve plates, and a pin with a pin hole is provided at the other end of the tensioning rope; a release rope is provided on the outer cylinder, and a cotter pin is provided at the other end; when the cotter pin passes through the pin holes of the two pins at the same time, the two tensioning ropes are in a stressed state to open the two rotary valve plates, and the release rope is in a relaxed state at this time; when the sampler is extended downward to a set distance, the release rope is stretched straight by the force and the cotter pin is disengaged from the pin hole; the two tensioning ropes are in a relaxed state, and the two rotary valve plates are turned to be closed under the action of the torsion spring.

[0017] As a preferred solution of the present invention, the sampling outer cylinder is installed on the outside of the sampling inner cylinder by gluing, embedding or screwing; the cross sections of the sampling inner cylinder and the sampling outer cylinder are rectangular or regular trapezoidal.

[0018] As a preferred solution of the present invention, the bottom end of the screw rod is connected to the top end of the sampler through a cylindrical piston, and a one-way valve is provided in the piston for connecting to the inner cavity of the sampling inner cylinder.

[0019] As a preferred solution of the present invention, the connecting plate includes a frame-shaped bottom, the center of which is connected to the output end of the cutting motor, and the sides of the frame-shaped bottom are connected to the knife shafts of each cutting knife.

[0020] As a preferred solution of the present invention, grooves are provided at intervals between the sections of the sampling outer cylinder, and the rubber seals are embedded in the grooves.

[0021] As a preferred solution of the present invention, the rubber seal is in the form of a rectangular frame or a trapezoidal frame. The rubber seal is arranged around the sampler and has a transverse slit on the side opposite to the cutter blade for the cutter head to pass through.

[0022] As a preferred embodiment of the present invention, the outer cylinder is provided with several horizontal knife grooves arranged along the vertical direction; the knife groove is composed of a rectangular groove and an axial groove, the opening of the vertical through groove is located on one side of the rectangular groove, the cutting head is located on the other side of the rectangular groove, the knife shaft is located in the axial groove, and a knife shaft sealing ring is provided at the end of the axial groove; the sampler is arranged through the vertical through groove, and each rubber seal is located in its corresponding rectangular groove and nested on the outside of the sampler; the injection channel is arranged in the outer cylinder, and is connected to each injection port through a branch pipe or a branch channel.

[0023] As a preferred embodiment of the present invention, the thickness of the sampling inner cylinder at the interval between two adjacent sections of the sampling outer cylinder is smaller than that at other parts, that is, the wall thickness of the area to be cut is relatively thinner; the cutting head of the cutting knife is flat, and its side edge can be pressed and sealed by the rubber seal; the blade is a single bevel, which can be embedded in the rubber seal to achieve sealing after cutting a complete circle of the area to be cut.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. The sampling device of the present invention can perform cutting and injection operations in situ after sampling the seabed, thereby preventing sediments at different locations and the microorganisms therein from settling, flowing, moving or diffusing with each other during the long-term static storage of the sample.

[0026] 2. The sampling device of this invention utilizes a specially designed wall thickness to facilitate cutting. After cutting, a rubber seal seals the edge of the cutter blade, while the cutter blade itself also serves as a sealing element for each section of the sampling inner barrel. Thus, this invention minimizes both cutting and sealing functions, resulting in a highly efficient and innovative design.

[0027] 3. The sampling device of this invention does not include any sealing components within the lower opening of the sampler. After insertion, sediment can enter the sampler undisturbed. The closure mechanism located outside the opening serves only as a temporary seal; instead, a cutting and sealing system provides both cutting and long-term sealing. This innovative design not only addresses the high disturbance caused by conventional petal samplers, but also solves the problem of achieving a seal after cutting the seabed. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 Schematic diagram of the overall structure of the sampling device for cutting and injecting seabed sediments.

[0029] Figure 2 It is a longitudinal cross-sectional view of the outer cylinder part of the sampling device.

[0030] Figure 3 Schematic diagram of the open end structure of the sampler.

[0031] Figure 4 It is a side view of the cutting knife (vertical cross-sectional view).

[0032] Figure 5 This is the matching diagram of the cutting knife groove (top view of the transverse section).

[0033] Figure 6 Schematic diagram of the injection channel.

[0034] The reference numerals in the figure are: 1 sampling displacement system, 1-1 sampling motor, 1-2 screw rod, 1-3 gear set, 2 outer cylinder, 2-1 cylinder wall, 2-2 knife groove, 2-3 rubber seal, 2-4 injection channel, 3 sampler, 3-1 sampling inner cylinder, 3-2 sampling outer cylinder, 3-3 closing mechanism, 3-4 release rope, 3-5 tensioning rope, 3-6 torsion spring, 4 cutting sealing system, 4-1 cutting motor, 4-2 connecting plate, 4-3 cutting knife, 4-3-1 cutting knife head, 4-3-2 knife shaft, 4-3-3 cutting knife sealing ring. DETAILED DESCRIPTION

[0035] The technical solutions of the present invention will be described in detail below through embodiments with reference to the accompanying drawings. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention.

[0036] The serial numbers assigned to the components in this application, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings). In the description of this application, it should be understood that the orientation or position relationship indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, rather than indicating or implying 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 a limitation to this application.

[0037] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0038] It should be pointed out in particular that in the present invention, only the necessary structures and components of the sampling device are described in detail. Based on the cognition of those skilled in the art, such devices need to be equipped with necessary accessories such as communication devices, control devices, hooks (or handles) in order to perform sampling tasks. However, the applicant believes that those skilled in the art can select or configure relevant accessories or auxiliary structures based on their skills and in combination with existing known technologies in order to correctly perform sampling tasks. Since these auxiliary technical contents are not the core technology of the present invention and do not have a substantial impact on the technical implementation of the present invention, the present invention will not be described in detail.

[0039] like Figure 1-3 As shown, the sampling device for in-situ sampling, cutting and injection of seabed sediments of the present invention comprises a sampling displacement system 1, a sampler 3, a cutting and sealing system 4 and an injection system; wherein,

[0040] The sampling displacement system 1 includes a sampling motor 1-1, a screw 1-2 and a gear set 1-3; the gear set 1-3 includes at least two gears, one of which is fixedly mounted on the output end of the sampling motor 1-1, and the other is meshingly sleeved on the screw 1-2; the sampling motor 1-1 can drive the screw 1-2 to move up and down in the vertical direction through the gear set 1-3.

[0041] The sampler 3 includes a sampling inner cylinder 3-1 and a sampling outer cylinder 3-2; the sampling inner cylinder 3-1 is made of plastic, with a closed top and an open bottom. The bottom end of the screw rod 1-2 is connected to the top of the sampler 3 through a cylindrical piston (not shown in the figure), and a one-way valve is provided in the piston to connect the inner cavity of the sampling inner cylinder 3-1. The sampling outer cylinder 3-2 is made of metal (such as 316L stainless steel) and is divided into several sections. It is fixed on the outside of the sampling inner cylinder 3-1 from top to bottom, and the same spacing distance is maintained between adjacent sections. Grooves are provided at the intervals between each section of the sampling outer cylinder for embedding rubber seals 2-3. Optionally, the sampling outer cylinder 3-2 is installed on the outside of the sampling inner cylinder 3-1 by gluing, embedding or screwing, and the cross-sections of the sampling inner cylinder 3-1 and the sampling outer cylinder 3-2 are rectangular (such as Figure 5 At the interval between two adjacent sections of the sampling outer cylinder 3-2, the thickness of the sampling inner cylinder 3-1 is smaller than that of other parts, that is, the wall thickness of the area to be cut is relatively thinner.

[0042] At the bottom of the outer sampling cylinder 3-2 is a closing mechanism 3-3 for sealing the sampler opening. Specifically, the open end of the sampler 3 extends beyond the bottom of the outer cylinder 2, and a rotating shaft is located along the central axis of the open end. The two rotating valve plates in the closing mechanism 3-3 are movably mounted on the rotating shaft at their side edges, and a torsion spring 3-6 is attached to the rotating shaft to close the two valve plates. Each of the two rotary valve plates is provided with a tensioning rope 3-5, each end of which is provided with a pin with a pinhole. A release rope 3-4 is provided on the outer cylinder, the other end of which is provided with a cotter pin. When the cotter pins pass through the pinholes of both pins, the two tensioning ropes 3-5 are stressed, causing the two rotary valve plates to open, while the release ropes 3-4 are relaxed. When the sampler 3 is extended downward to a set distance, the release ropes 3-4 are stretched and straightened, causing the cotter pins to disengage from the pinholes. With the two tensioning ropes 3-5 relaxed, the two rotary valve plates are closed by the action of the torsion spring 3-6, temporarily sealing the open end of the sampler 3. Both the tensioning ropes 3-5 and the release ropes 3-4 can be braided nylon ropes to adapt to the seabed environment.

[0043] The cutting sealing system 4 includes a cutting knife 4-3, a cutting motor 4-1, a connecting plate 4-2 and a sealing assembly; the cutting knife 4-3 includes a plate-type cutting head 4-3-1 and a handle-shaped knife shaft 4-3-2, and the blade is arranged on the side opposite to the knife shaft 4-3-2; the cutting motor 4-1 is a watertight electric push rod, and its output end is connected to the knife shaft 4-3-2 through the connecting plate 4-2; the sealing assembly includes several rubber seals 2-3, which are respectively arranged at the intervals between each section of the sampling outer cylinder 3-2; the number of the cutting knives 4-3 is consistent with the number of rubber seals 2-3 and are arranged in sequence along the axial direction of the sampler 3, the cutting heads 4-3-1 are all horizontally oriented and the blades face the rubber seals 2-3, and the inner side of the rubber seals 2-3 has a groove that adapts to the edge shape of the cutting head 4-3-1. Optionally, the rubber seal 2-3 is a rectangular frame structure arranged around the sampler 3 (such as Figure 5 ), or a trapezoidal frame structure; a transverse slit is provided on the side opposite the cutting edge of the cutter 4-3 for the insertion of the cutter head 4-3-1. The cutter head 4-3-1 is flat, its side edges being compressed and sealed by the rubber seal 2-3; the cutting edge is a single bevel, capable of embedding into the rubber seal 2-3 to achieve a seal after cutting a complete circle of the area to be cut.

[0044] The injection system includes an injection device (not shown), injection channels 2-4, and injection ports. The number of injection ports matches the number of sealing components, and they are located on the sidewall of the sampler 3 above each rubber seal 2-3. One end of the injection channel 2-4 is connected to the injection device, and the other end communicates with the interior of the sampler 3 through each injection port. In other words, each segment of the cut and separated sampling inner cylinder 3-1 has an injection port for injecting the fixative.

[0045] The outer cylinder 2 is used to load or install the aforementioned sampling displacement system 1, sampler 3, cutting sealing system 4, and injection system. A vertical through-slot shaped to match the sampler is provided in the outer cylinder 2, and the sampler 3 is movably mounted therein, capable of moving up and down to perform sampling operations. The outer cylinder 2 also includes several horizontal knife grooves 2-2 arranged along the vertical direction. The knife grooves 2-2 consist of a rectangular groove and an axial groove. The opening of the vertical through-slot is located on one side of the rectangular groove, the cutting head 4-3-1 is located on the other side of the rectangular groove, and the knife shaft 4-3-2 is located within the axial groove. A knife shaft sealing ring 4-3-3 is provided at the end of the axial groove, and the knife shaft 4-3-2 is sleeved within the knife shaft sealing ring 4-3-3. The sampler 3 is provided through the vertical through-slot, and each rubber seal 2-3 is located in its corresponding rectangular groove and nested on the outside of the sampler 3. An injection channel connected to the injection device is provided in the outer cylinder 2, and is connected to each injection port via a branch pipe or branch channel.

[0046] As a further optional solution, the sampling device of the present invention can be configured to have two symmetrically arranged sets of samplers 3, cutting sealing systems 4, injection channels, and outer cylinders 2: the two outer cylinders 2 are fixedly connected by a base plate and a crossbeam, and each outer cylinder 2 is respectively loaded or installed with a set of samplers 3, cutting sealing systems 4, and injection channels; the cutting motor 4-1 and the injection device are fixed on the base plate between the two outer cylinders 2. In this case, the gear set 1-3 includes a small gear fixed to the end of the output shaft of the sampling motor 1-1, and two large gears respectively meshed with the two screw rods 1-2, so that two sampling devices can be driven simultaneously by one set of power output. The connecting plate 4-2 includes a frame-shaped bottom, the center of which is connected to the output end of the cutting motor 4-1, and the side of the frame-shaped bottom is connected to the knife shaft 4-3-2 of each cutting knife 4-3.

[0047] A waterproof power supply can be further fixed to the baseplate, connected via watertight wiring to the sampling motor 1-1, cutting motor 4-1, and injection device, driving the relevant motor equipment. The injection device can adopt a conventional configuration, including an injection motor and a fixed liquid storage tank. A watertight control cabin can also be fixed to the baseplate, housing a control chip and a communication chip. Watertight interfaces and signal lines connect the motors, enabling remote communication to control sampling and other actions, or automatically executing sampling and other actions locally according to settings.

[0048] Detailed description of each figure:

[0049] like Figure 1As shown, the sampling device of the present invention includes a sampling displacement system 1, an outer cylinder 2, a sampler 3, and a cutting and sealing system 4. The sampling displacement system 1 is used to insert and remove the sampler 3; the outer cylinder 2 is used to support the sampling displacement system 1, the sampler 3, and the cutting and sealing system 4; the sampler 3 is used to sample surface sediments; and the cutting and sealing system 4 is used to cut and seal surface sediments.

[0050] like Figure 2 、 Figure 3 As shown, the sampling displacement system 1 includes a sampling motor 1-1, a screw 1-2, and a gear set 1-3. The sampling motor 1-1 drives both screws 1-2 up and down simultaneously through the gear set 1-3. The gear set 1-3 comprises a small gear fixed to the shaft of the sampling motor 1-1 and a large gear meshingly mounted on each of the two screws 1-2. The sampler 3 comprises an inner sampling cylinder 3-1 and an outer sampling cylinder 3-2. The lower end of the inner sampling cylinder 3-1 is open and is a hollow, rectangular, long prism made of heat-sensitive resin via 3D printing. The wall thickness is relatively thin in the area to be cut. The outer sampling cylinder 3-2 is made of 316L stainless steel and is divided into three sections along the longitudinal direction. The top of the sampler 3 features a cylindrical piston with an internal one-way valve. At the end of the sampler 3 are a closing mechanism 3-3, a release rope 3-4, a tensioning rope 3-5, and a torsion spring 3-6. The rotating shaft of the closing mechanism 3-3 is connected by the torsion spring 3-6. One end of the release rope 3-4 is connected to the bottom surface of the outer cylinder 2, and the other end is connected to the outside of the valve plate. The ends of the two release ropes 3-4 are pins with pin holes. Passing the cotter pins through the pin holes can put the two tensioning ropes 3-5 in a stressed state, keeping the two rotary valve plates in an open state. At this time, the release ropes 3-4 are in a relaxed state. When the release rope 3-4 is straightened, the cotter pin at the end thereof slips out of the pin hole, triggering the action of the torsion spring 3-6. The cutting and sealing system 4 includes a cutting motor 4-1, a connecting plate 4-2, and a cutting knife 4-3, which are used for cutting and sealing surface sediments. The cutting motor 4-1 is a watertight electric push rod, the bottom of which is fixed to the bottom plate of the rear part of the outer side of the outer cylinder 2. The motor shaft is connected to the connecting plate 4-2. There are two cutting knives 4-3, which are connected through the connecting plate 4-2.

[0051] like Figure 4 As shown, the cutter 4-3 comprises a cutter head 4-3-1 and a cutter shaft 4-3-2. The front end of the cutter head 4-3-1 is an inclined surface for cutting the sampler 3, and the rear end is a flat surface that can be compressed and sealed by the rubber seal 2-3. The cutter shaft 4-3-2 is sealed to the outer cylinder 2 by a cutter shaft sealing ring 4-3-3.

[0052] like Figure 5 、 Figure 6As shown, the outer cylinder 2 includes a cylinder wall 2-1, which is provided with a knife groove 2-2, a rubber seal 2-3, and an injection channel 2-4. The rear parts of the two outer cylinders 2 are connected by a bottom plate, and the middle parts are connected by upper and lower cross beams. Each outer cylinder 2 has a vertical square through groove for matching with the square long prism-shaped sampler 3. The square through groove has three horizontal knife grooves 2-2 distributed along the vertical direction. The knife groove 2-2 consists of a rectangular groove and an axial groove at the rear end. A rubber seal 2-3 is embedded on the outside of the sampler 3 in the knife groove 2-2, which is used to press against the lower end face of the cutter 4-3 to form a seal. The front end of the rectangular groove can be designed as a bevel, which is used to match and lock with the front end of the cutter 4-3. An injection channel 2-4 is provided in the outer cylinder 2, which is divided into three parts. The injection channel 2-4 leads to the three layers through branch pipelines and is connected to the injection port of the sampler 3 of each layer.

[0053] Example of how to use the sampling device:

[0054] (1) Preparation: On the mother ship, manually open the two rotary valve plates of the closing mechanism 3-3, and simultaneously pass the cotter pin at the end of the release rope 3-4 through the pin holes at the ends of the two tensioning ropes 3-5, so that the two tensioning ropes are in a tensioned state.

[0055] (2) Sampling: The sampling device is lowered to the target seabed area using an underwater robot. Then, according to the sampling time node setting, under remote control or local automatic control, the sampling motor 1-1 drives the sampler 3 down into the seabed sediment, and the overlying water overflows from the one-way valve in the top piston of the sampler 3. When the sampler 3 reaches the set depth, the release rope 3-4 is stretched to straighten the cotter pin and disengage it from the pin hole; the two tension ropes 3-5 are in a relaxed state, and the two rotary valve plates are turned closed under the action of the torsion spring 3-6. The sampling motor 1-1 drives the sampler 3 to lift until the top piston and the cylinder are sealed.

[0056] (3) Cutting: The cutting motor 4-1 drives the cutting blade 4-3 toward the sampler 3, squeezing and cutting the area to be cut of the sampling inner cylinder 3-1. After the cutting blade 4-3 completely cuts through the sampling inner cylinder 3-1, it inserts into the rubber seal 2-3 in the knife groove 2-2 on the other side of the sampler 3. The cutting motor 4-1 is powered off, and the sample taken from each section of the sampling inner cylinder 3-1 is sealed.

[0057] (4) Injection: Formalin solution is injected from injection channels 2-4 by the injection device and enters each section of the sealed sample from each injection port for fixation and preservation.

[0058] (5) Recovery: After all samples in the operation area are collected, the underwater robot recovers all the sampling devices to the mother ship, completing the sampling operation.

Claims

1. A sampling device for in-situ sampling, cutting and injection of seabed sediments, characterized in that: It includes sampling displacement system, sampler, cutting and sealing system and injection system; among which, The sampling displacement system includes a sampling motor, a lead screw and a gear set; the gear set includes at least two gears, one of which is fixedly mounted on the output end of the sampling motor and the other is meshingly sleeved on the lead screw; the sampling motor can drive the lead screw to move up and down in the vertical direction through the gear set; The sampler comprises an inner sampling cylinder and an outer sampling cylinder; the inner sampling cylinder is made of plastic, with a closed top and an open bottom; the outer sampling cylinder is made of metal and is divided into several sections, which are fixed to the outside of the inner sampling cylinder from top to bottom, with adjacent sections maintaining the same spacing; a closing mechanism for closing the sampler opening is provided at the bottom of the outer sampling cylinder; the bottom end of the screw rod is connected to the top end of the sampler; The cutting sealing system includes a cutting knife, a cutting motor, a connecting plate, and a sealing assembly. The cutting knife includes a plate-type cutting knife head and a handle-shaped cutting knife shaft, with the blade located on the side opposite the cutting knife shaft. The cutting motor is a watertight electric push rod, the output end of which is connected to the cutting knife shaft via a connecting plate. The sealing assembly includes several rubber seals, which are respectively located at the intervals between each section of the sampling outer cylinder. The number of the cutting knives is the same as the number of rubber seals, and they are arranged in sequence along the axial direction of the sampler. The cutting knife heads are all horizontally oriented with the blades facing the rubber seals. The inner side of the rubber seals has a groove that adapts to the shape of the cutting knife head edge. The injection system includes an injection device, an injection channel, and an injection port. The number of injection ports is the same as that of the sealing assembly and is respectively provided on the side wall of the sampler above each rubber seal. One end of the injection channel is connected to the injection device, and the other end is connected to the interior of the sampler through each injection port. The outer cylinder is used to load or install the aforementioned sampling displacement system, sampler, cutting sealing system and injection system; a vertical through groove with a shape matching that of the sampler is provided in the outer cylinder, and the sampler is movably installed therein.

2. The sampling device according to claim 1, characterized in that There are two sets of samplers, cutting sealing systems, injection channels and outer cylinders. The two outer cylinders are fixedly connected by a base plate and a crossbeam. Each outer cylinder is loaded or installed with a set of samplers, cutting sealing systems and injection channels. The cutting motor and injection device are fixed on the base plate between the two outer cylinders, wherein the cutting motor is connected to the middle part of the connecting plate, and the knife shafts of each cutting knife in the two sets of cutting sealing systems are respectively connected to the two sides of the connecting plate.

3. The sampling device according to claim 1, characterized in that The open end of the sampler extends out of the bottom of the outer cylinder, and a rotating shaft is provided on the central axis of the open end; the two rotary valve plates in the closing mechanism are movably mounted on the rotating shaft with their side edges, and a torsion spring for closing the two rotary valve plates is provided on the rotating shaft; A tensioning rope is provided on each of the two rotary valve plates, and a pin with a pin hole is provided at the other end of the tensioning rope; a release rope is provided on the outer cylinder, and a cotter pin is provided at the other end; when the cotter pin passes through the pin holes of the two pins at the same time, the two tensioning ropes are in a stressed state to open the two rotary valve plates, and the release rope is in a relaxed state at this time; when the sampler is extended downward to a set distance, the release rope is stretched straight by the force and the cotter pin is disengaged from the pin hole; the two tensioning ropes are in a relaxed state, and the two rotary valve plates are turned to be closed under the action of the torsion spring.

4. The sampling device according to claim 1, characterized in that The sampling outer cylinder is installed on the outer side of the sampling inner cylinder by gluing, embedding or screw fixing; the cross sections of the sampling inner cylinder and the sampling outer cylinder are rectangular or regular trapezoidal.

5. The sampling device according to claim 1, characterized in that The bottom end of the screw rod is connected to the top end of the sampler through a columnar piston, and a one-way valve is arranged in the piston for connecting to the inner cavity of the sampling inner cylinder.

6. The sampling device according to claim 1, characterized in that The connecting plate comprises a frame-shaped bottom, the center of which is connected to the output end of the cutting motor, and the side of the frame-shaped bottom is connected to the knife shaft of each cutting knife.

7. The sampling device according to claim 1, characterized in that Grooves are provided at intervals of each section of the sampling outer cylinder, and the rubber sealing components are embedded in the grooves.

8. The sampling device according to claim 1, characterized in that The rubber seal is in a rectangular frame or trapezoidal frame structure. The rubber seal is arranged around the sampler and has a transverse gap on the side opposite to the cutter blade for the cutter head to pass through.

9. The sampling device according to claim 1, characterized in that The outer cylinder is provided with several horizontal knife grooves arranged in the vertical direction; the knife groove is composed of a rectangular groove and an axial groove, the opening of the vertical through groove is located on one side of the rectangular groove, the cutting head is located on the other side of the rectangular groove, the knife shaft is located in the axial groove, and a knife shaft sealing ring is provided at the end of the axial groove; the sampler is arranged through the vertical through groove, and each rubber seal is located in its corresponding rectangular groove and nested on the outside of the sampler; the injection channel is arranged in the outer cylinder and is connected to each injection port through a branch pipeline or a branch channel.

10. The sampling device according to claim 1, characterized in that The thickness of the sampling inner cylinder at the interval between two adjacent sections of the sampling outer cylinder is smaller than that at other parts, that is, the wall thickness of the area to be cut is relatively thinner; the cutting head of the cutter is flat, and its side edge can be pressed and sealed by the rubber seal; the blade is a single bevel, which can be embedded in the rubber seal to achieve sealing after cutting a complete circle of the area to be cut.

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