In-situ testing device for environmental chemical property parameters of seabed settled layer

Abstract

The invention discloses an in-situ testing device for environmental chemical property parameters of a seabed sedimentary layer. The in-situ testing device is specially designed for being matched with a seabed drilling machine. In the operation process, the device is fixedly installed in a specific test section cavity of the detection rod. The diaphragm pump is driven by the electric push rod to achieve stable displacement in the vertical direction, pore water samples are passively collected by means of the synergistic effect of the permeable ceramic and the one-way valve, the pore water samples in the detection cavity are updated through the pump valve, and therefore in-situ continuous detection of key chemical parameters such as pH, H2S, Eh and CO3 < 2-> of pore water of the seabed sedimentary layer is achieved. The system has the advantages of simple and reliable structure, low-disturbance acquisition, high precision, quick response, strong environmental adaptability, low cost, convenience in maintenance, high efficiency and the like. High-quality in-situ test data is provided for marine scientific research and resource development, and deep understanding of the biogeochemical process of the seabed sedimentary layer is facilitated.

Description

Technical Field

[0001] The present invention belongs to the field of marine geotechnical investigation equipment, relates to the field of in-situ testing technology, and particularly relates to an in-situ testing device for environmental chemical and physical property parameters of submarine sediment layers. Background Art

[0002] A large amount of key geochemical information is contained in sediment pore water. This information can reflect the physicochemical properties and deposition rates of the substances buried contemporaneously with the sediment, as well as the diffusion, migration, and chemical reaction processes of substances between seawater and sediment. These processes further determine the redox environment of the entire sediment and bottom water interface. The chemical composition change of sediment pore water is affected by the deposition rate, redox potential, and organic matter content in the sediment, and has important biogeochemical significance. Moreover, the physical and chemical property parameters of submarine sediments are of great significance for marine engineering, resource exploration, and environmental assessment.

[0003] Due to the complexity of the deep-sea environment, it is difficult to obtain high-quality undisturbed samples by traditional sampling methods. Therefore, the in-situ testing technology for submarine sediment layers has become an important means for submarine engineering investigation. During the in-situ detection process of geochemical parameters of submarine sediments, an in-situ testing device for chemical and physical properties of sediment layers is usually used as a supporting device for a submarine drill and is fixedly installed in a detection cavity of a certain section of a detection rod. By using the penetration force of the drill, the device is pressed into the submarine sediment layer to achieve real-time, efficient, and in-situ measurement of sediment layer chemical parameters. This measurement method can effectively avoid physicochemical changes such as the escape of dissolved gases and component oxidation caused by the drastic temperature and pressure changes from the seabed to the sea surface during the collection process of sediment samples, thereby ensuring the accuracy and reliability of the test results.

[0004] In recent years, the "In-situ Detection and Simulation System for Gas Hydrate Geochemical Parameters in Deep-sea Sediments" developed in China can detect the changes of chemical parameters such as dissolved CH4, H2S / HS - and SO4 2- in sediment pore water through laser Raman spectroscopy detection technology. However, this instrument is large in volume, high in cost, and the pore water parameters and depths that can be measured are relatively limited. There is an urgent need to carry out research on rapid detection technology for high-precision chemical parameters based on in-situ testing rods to meet the needs of marine scientific research and resource development. Summary of the Invention

[0005] In order to solve the technical problems of large errors in experimental results and the lack of in-situ, long-term, time-segmented collection, detection, and storage of the large-depth profile of sediment pore water in the existing in-situ sampling and detection technology of submarine sediment pore water, the present invention provides an in-situ testing device for environmental chemical physical property parameters of submarine sediment layers, thereby realizing the rapid in-situ detection of the large-depth profile of pore water chemical parameters in the submarine sediment environment. The operation steps are relatively simple, the requirements for operators are relatively low, the detection process has little environmental disturbance, and the detection efficiency is relatively high.

[0006] The object of the present invention is achieved through the following technical solutions: An in-situ testing device for environmental chemical physical property parameters of submarine sediment layers, the device includes a probe rod, and an upper power supply composite cable, a detection chamber, a diaphragm pump, and a lower power supply composite cable installed in the probe rod from top to bottom; A microelectrode group is installed inside the detection chamber, and the microelectrode group is connected to the upper power supply composite cable; One one-way valve chamber is connected to each side of the detection chamber; an inlet one-way valve and an outlet one-way valve are respectively installed in the two one-way valve chambers; The lower end of the detection chamber is connected to the diaphragm pump. The diaphragm pump controls the opening and closing of the inlet one-way valve and the outlet one-way valve through piston movement, collects and discharges pore water, and the lower end of the diaphragm pump is connected to the lower power supply composite cable.

[0007] Further, the probe rod is cylindrical, with a hollow cavity inside. There are two holes on the probe rod wall. The upper power supply composite cable, the electrode fixing part, the microelectrode group, the microelectrode connecting part, the detection chamber, the diaphragm pump, the connecting sleeve, and the lower power supply composite cable are all arranged inside the probe rod. The probe rod only has the function of detection and perception. During operation, the upper end needs to be connected to the data acquisition and communication module, and the lower end needs to be connected to other testing units or directly connected to the drill bit.

[0008] Further, the electrode fixing part is an irregular wedge shape, hollow inside, shaped like a bolt at the upper part, with a groove on the shoulder. After being connected to the microelectrode connecting part, vulcanized rubber is poured in. After completely drying, a sealing ring is placed at the groove position, and it passes through the upper opening of the detection chamber from bottom to top. The contact surface between the electrode fixing part and the detection chamber is pressed by a fastening nut, and only the upper power supply composite cable is exposed.

[0009] Further, one end of the one-way valve chamber is connected to the detection chamber, and the other end is connected to one side of the perforated cover; the lower edge of the other side of the perforated cover is pressed against the probe rod; the upper edge of the perforated cover is connected to one side of the ceramic filter, and the other side of the ceramic filter is connected to the gland.

[0010] Further, both ends of the one-way valve chamber are provided with threads, and there are circular grooves on both sides of the middle protrusion; a sealing ring is installed at the groove position at one end of the one-way valve chamber and is connected to the detection chamber through threads to prevent pore water from seeping into the probe rod.

[0011] Further, the diaphragm pump is composed of a diaphragm, a piston, a ball, a telescopic rod, a micro pump machine, and an exhaust hole; The upper end of the diaphragm pump is connected to the lower end of the detection chamber, and the diaphragm is installed between the diaphragm pump and the detection chamber; one end of the telescopic rod is connected to the piston, and the other end is connected to the micro pump, and there is an exhaust hole on the diaphragm pump wall; ball bearings are installed between the piston and the inner wall of the diaphragm pump; the lower end of the diaphragm pump is connected to the upper end of the motor through a connecting sleeve; the lower end of the motor leads out a power and communication composite cable.

[0012] Further, silica gel gaskets are installed on both sides of the diaphragm of the diaphragm pump, and the lower part of the detection chamber presses the upper part of the diaphragm pump and is tightly connected by screws.

[0013] Further, after the detection chamber, the diaphragm pump, and the motor are installed and combined in sequence to form an integral body, they are then placed into the probe rod to ensure that the one-way valve chambers on both sides are accurately aligned with the two holes on the probe rod wall; the perforated cover is of a hollow structure. Before installation, a sealing ring is first put on, and then it is pressed into the hole and tightened to the one-way valve chamber; the ceramic filter element is embedded in the perforated cover, and then it is pressed tightly with a gland, and the internal hexagonal screw is tightened to complete the fixation.

[0014] Further, the microelectrode group is one or a combination of a pH electrode, an Ag / AgCl electrode, an Ag / Ag2S electrode, an Eh electrode, a dissolved oxygen electrode, a sulfate electrode, a carbonate electrode, or a temperature electrode, and is fixed to the lower end of the microelectrode connector by welding or epoxy resin adhesive bonding for in-situ detection of various chemical physical property parameters of the pore water environment of marine sediments.

[0015] Further, the motor drives the piston to move up and down reciprocally. When the piston moves upward, the diaphragm deflects upward due to the increased pressure, the inlet one-way valve opens, and the outlet one-way valve closes. The pore water flows to the water inlet chamber after being filtered by the ceramic filter element and is passively collected into the detection chamber; conversely, when the piston moves downward, the diaphragm deflects downward due to the decreased pressure, the inlet one-way valve closes, and the outlet one-way valve opens. The pore water flows through the water outlet chamber from the detection chamber and is discharged from the probe rod.

[0016] The advantages and positive effects of the present invention are as follows: 1. Low disturbance: The in-situ test device for chemical physical property parameters of the seabed sediment layer environment designed by the present invention is a section of test rod of a sediment layer drilling rod, and its diameter is small. During the process of inserting it into the seabed sediment, the influence and disturbance on the peripheral environment of the sediment layer are small.

[0017] 2. Reliable structure: The structure of the in-situ test device for chemical physical property parameters of the seabed sediment layer environment designed by the present invention is reliable, and its core component adopts a piston-driven micro diaphragm pump. This diaphragm pump changes the pump chamber volume by using the reciprocating motion of the piston / diaphragm driven by the motor, accurately controls the minute pressure difference change between the detection chamber inside the probe rod and the sediment layer outside the probe rod, and realizes the active sampling of the sediment layer pore water and the process of discharging waste liquid with the cooperation of the one-way valve.

[0018] 3. Low cost: The in-situ testing device for environmental chemical and physical property parameters of submarine sediment layers designed in the present invention is convenient for processing and assembly. The processing technology of its components is simple and the cost is low. The connection method mostly adopts the fixed connection of bolts and nuts, or uses vulcanized rubber bonding. Silicone materials, sealing rings and other materials are used to ensure the sealing performance of the device. The assembly and disassembly are simple and efficient, which is convenient for maintenance and replacement, and has high economic practicability.

[0019] 4. Easy replacement of parts: The in-situ testing device for environmental chemical and physical property parameters of submarine sediment layers designed in the present invention has no complex transmission components, and the parts are convenient to replace. The microelectrode group and the microelectrode connecting piece are connected by welding or epoxy resin glue adhesion, and the damaged parts can be replaced independently. If the microelectrode is damaged, only the original microelectrode needs to be removed by heating and melting and chemical washing, and a new microelectrode can be replaced.

[0020] 5. High efficiency: The in-situ testing device for environmental chemical and physical property parameters of submarine sediment layers designed in the present invention adopts the micro-motor drive technology to ensure the stable and reliable output of the motor during operation. The diaphragm pump piston of the device effectively reduces the frictional resistance through the ball design, reduces the requirement for the motor power, enables it to adapt to a small-power motor, and further optimizes the energy consumption and performance of the device. During the sample replacement process, the diaphragm pump and the one-way valve work together to achieve the rapid replacement of the sample, significantly improving the testing efficiency, so as to better meet the needs of in-situ testing of submarine sediment layers.

[0021] 6. High precision: When the detection chamber of the in-situ testing device for environmental chemical and physical property parameters of submarine sediment layers collects pore water samples, the water samples enter through the openings on both sides of the probe rod. Since the aperture of these openings is small, the disturbance to the sediment during the collection process is extremely small, which can ensure the in-situ property of the water samples. By accurately recording the depth of the probe rod descending into the sediment layer, the depth position of the water sample to be measured can be clearly known. This design enables the device to achieve the precise detection of the profile distribution of sediment pore water, providing reliable data support for the study of the chemical and physical property parameters of submarine sediment layers. Description of the Drawings

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0023] Figure 1 It is the full cross-section of the front view of the in-situ testing device for environmental chemical and physical property parameters of submarine sediment layers.

[0024] Figure 2 It is the full cross-section of the rear view of the in-situ testing device for environmental chemical and physical property parameters of submarine sediment layers.

[0025] Figure 3 It is a schematic diagram of the in-situ testing device for environmental chemical and physical property parameters of submarine sediment layers.

[0026] Figure 4 For Figure 3 Partial enlarged view A in

[0027] Figure 5 For Figure 3 Partial enlarged view B in

[0028] Figure 6 It is the top view of the in-situ testing device for environmental chemical and physical property parameters of submarine sediment layers.

[0029] Figure 7 It is the front view of the in-situ testing device for environmental chemical and physical property parameters of submarine sediment layers.

[0030] Figure 8 It is the front external view of the in-situ testing device for environmental chemical and physical property parameters of submarine sediment layers.

[0031] Figure 9 It is the internal structure diagram of the in-situ testing device for environmental chemical and physical property parameters of submarine sediment layers.

[0032] Among them: 1 is the sounding rod, 2 is the power-on composite cable, 3 is the electrode fixing part, 4 is the fastening nut, 5 is the sealing ring, 6 is the microelectrode group, 7 is the one-way valve chamber, 8 is the outlet one-way valve, 9 is the water outlet chamber, 10 is the ceramic filter, 11 is the diaphragm pump, 11-1 is the diaphragm, 11-2 is the piston, 11-3 is the ball, 11-4 is the telescopic rod, 11-5 is the micro pump, 11-6 is the exhaust hole, 12 is the connecting sleeve, 13 is the motor, 14 is the power-off composite cable, 15 is the detection chamber, 16 is the perforated cover, 17 is the inlet one-way valve, 18 is the water inlet chamber, 19 is the gland, 20 is the microelectrode connecting part. Specific implementation mode

[0033] In order to make the purpose, technical solution and advantages of the present invention clearer and more understandable, the present invention will be further described below with reference to the accompanying drawings and implementation cases. It should be understood that the specific implementation cases described herein are only used to explain the present invention and are not used to limit the present invention.

[0034] As Figures 1-9As shown in the figure, the present invention provides an in-situ testing device for chemical physical property parameters of submarine sediment layer environment. The device includes a probe rod 1, an upper power and communication composite cable 2, an electrode fixing part 3, a fastening nut 4, a sealing ring 5, a microelectrode group 6, a one-way valve chamber 7, an outlet one-way valve 8, a water outlet chamber 9, a ceramic filter 10, a diaphragm pump 11, a diaphragm 11-1, a piston 11-2, a ball 11-3, a telescopic rod 11-4, a micro pump 11-5, an exhaust hole 11-6, a connecting sleeve 12, a motor 13, a lower power and communication composite cable 14, a detection chamber 15, a perforated cover 16, an inlet one-way valve 17, a water inlet chamber 18, a gland 19 and a microelectrode connecting part 20.

[0035] The probe rod 1 is cylindrical with a hollow cavity inside. There are two holes on the wall of the probe rod 1. The upper power and communication composite cable 2, the electrode fixing part 3, the microelectrode group 6, the microelectrode connecting part 20, the detection chamber 15, the diaphragm pump 11, the connecting sleeve 12 and the lower power and communication composite cable 14 are all arranged inside the probe rod 1. The probe rod 1 only has the function of detection and perception. During operation, the upper end needs to be connected to the data acquisition and communication module, and the lower end needs to be connected to other testing units or directly connected to the drill bit.

[0036] The microelectrode group 6 is installed on the microelectrode connecting part 20 and leads out the upper power and communication composite cable 2 through the microelectrode connecting part 20. The microelectrode group 6 is one or a combination of a pH electrode, an Ag / AgCl electrode, an Ag / Ag2S electrode, an Eh electrode, a dissolved oxygen electrode, a sulfate electrode, a carbonate electrode or a temperature electrode. It is fixed at the lower end of the microelectrode connecting part 20 by welding or epoxy resin adhesive for in-situ detection of various chemical physical property parameters of the pore water environment of marine sediments. As Figure 6 and Figure 9 As shown in the figure, the electrode fixing part 3 is installed on the outer wall of the microelectrode connecting part 20 and connected to the upper end of the detection chamber 15. The electrode fixing part 3 is an irregular wedge shape with a hollow inside. The upper part is shaped like a bolt and there is a groove on the shoulder. After connecting with the microelectrode connecting part 20, vulcanized rubber is poured in. After thoroughly drying, a sealing ring 5 is placed at the groove position, passed through the upper opening of the detection chamber 15 from bottom to top, and the contact surface between the electrode fixing part 3 and the detection chamber 15 is pressed by the fastening nut 4, only exposing the upper power and communication composite cable 2. As Figure 9 As shown in the figure, one end of each of the two one-way valve chambers 7 is connected to both sides of the detection chamber 15. An inlet one-way valve 17 and an outlet one-way valve 8 are respectively installed in the two one-way valve chambers 7. The other end of the one-way valve chamber 7 is connected to one side of the perforated cover 16. There are threads at both ends of the one-way valve chamber 7, and there are circular grooves on both sides of the middle protrusion. A sealing ring 5 is installed at the groove position at one end of the one-way valve chamber 7 and connected to the detection chamber 15 by threads to prevent pore water from seeping into the probe rod 1. The lower edge of the other side of the perforated cover 16 is pressed on the probe rod 1. One side of the ceramic filter 10 is connected to the upper edge of the perforated cover 16, and the other side is connected to the gland 19. As Figures 3-5As shown in the figure, the upper end of the diaphragm pump 11 is connected to the lower end of the detection chamber 15. The diaphragm 11-1 is installed between the diaphragm pump 11 and the detection chamber 15. Silicone gaskets are installed on both sides of the diaphragm 11-1 of the diaphragm pump 11. The lower part of the detection chamber 15 presses the upper part of the diaphragm pump 11 and is tightly connected by screws; One end of the telescopic rod 11-4 is connected to the piston 11-2, and the other end is connected to the micro pump 11-5. An exhaust hole 11-6 is provided on the wall of the diaphragm pump 11; Ball bearings 11-3 are installed between the piston 11-2 and the inner wall of the diaphragm pump 11; The lower end of the diaphragm pump 11 is connected to the upper end of the motor 13 through a connecting sleeve 12; The lower end of the motor 13 leads out a lower power-on composite cable 14; The motor 13 drives the piston 11-2 to reciprocate up and down. When the piston 11-2 moves upward, the diaphragm 11-1 deflects upward due to increased pressure. The inlet one-way valve 17 opens, and the outlet one-way valve 8 closes. The pore water flows to the water inlet chamber 18 after being filtered by the ceramic filter 10 and is passively collected into the detection chamber 15; On the contrary, when the piston 11-2 moves downward, the diaphragm 11-1 deflects downward due to decreased pressure. The inlet one-way valve 17 closes, and the outlet one-way valve 8 opens. The pore water flows through the water outlet chamber 9 from the detection chamber 15 and is discharged from the probe rod 1. The detection chamber 15, the diaphragm pump 11, and the motor 13 are installed and combined in sequence to form an integrated unit, and then placed into the probe rod 1 to ensure that the one-way valve chambers 7 on both sides are accurately aligned with the two holes on the wall of the probe rod 1; The perforated cover 16 has a hollow structure. Before installation, a sealing ring 5 is first put on, and then it is pressed into the hole and tightened onto the one-way valve chamber 7; The ceramic filter 10 is embedded in the perforated cover 16, and then it is pressed tightly with a gland 19, and the internal hexagonal screws are tightened to complete the fixation.

[0037] The working principle of the present invention is as follows: The motor 13 drives the piston 11-2 to reciprocate up and down, precisely controlling the tiny pressure difference change outside the probe rod 1 and inside the detection chamber 15, and realizing the active collection and discharge of the pore water sample in the sediment layer. When the motor 13 drives the piston 11-2 to perform an upward stroke, the diaphragm 11-1 expands upward due to increased internal pressure. At this time, the inlet one-way valve 17 opens, and the outlet one-way valve 8 closes. Under the action of pressure, the pore water in the sediment layer is finely filtered by the ceramic filter 10, flows into the water inlet chamber 18, and is actively collected into the detection chamber 15. After the microelectrode group 6 contacts the pore water, the collected signal is transmitted to the data acquisition module terminal through the upper power-on composite cable 2, completing the determination process of the environmental chemical parameters of the pore water environment in the sediment layer.

[0038] When the motor 13 drives the piston 11-2 to perform a downward stroke, the diaphragm 11-1 expands downward due to decreased internal pressure, generating a negative pressure inside the detection chamber 15 of the probe rod 1. At this time, the inlet one-way valve 17 closes, and the outlet one-way valve 8 opens, discharging the pore water in the detection chamber 15. This structural design realizes the efficient collection and real-time monitoring of the pore water in the sediment layer, and can ensure the accuracy and reliability of the test data.

[0039] An application example of the present invention is as follows: When conducting in-situ testing operations on the chemical parameters of the pore water environment in the sediment layer in the nearshore sea area, the probe rod 1 and its supporting test rod are installed on the drill rig, and it is ensured that all connecting components of the probe rod 1 (such as the power-on composite cable 2, the detection chamber 15, the motor 13, the diaphragm pump 11, etc.) are firmly connected. At the same time, check whether the operating states of the motor 13, the diaphragm pump 11, and the microelectrode group 6 are normal. Use a positioning system such as GPS or acoustic positioning to accurately position the drill rig to the target sediment layer area, start the propulsion mechanism, and drive the probe rod 1 to slowly penetrate into the seabed sediment layer. Driven by the propulsion mechanism, the probe rod 1 slowly and steadily penetrates into the seabed sediment layer. The motor 13 starts to drive the piston 11-2 to move up and down reciprocally according to a preset program. When the motor 13 drives the piston 11-2 to move upward, the diaphragm 11-1 expands upward due to the increase in internal pressure, the inlet check valve 17 opens, and the outlet check valve 8 closes. The pore water in the sediment layer outside the probe rod 1, under the action of pressure, passes through the filtration of the ceramic filter 10, removes mud, and then flows into the water inlet chamber 18, and is actively collected into the detection chamber 15. As the pore water enters the detection chamber 15, the microelectrode group 6 immediately starts to work and measures various chemical parameters of the pore water (such as pH value, dissolved oxygen concentration, redox potential, etc.) in real time. The collected signals are transmitted to the data acquisition module terminal through the power-on composite cable 2, completing the determination process of the chemical parameters of the pore water environment in the sediment layer. After the test is completed, the motor 13 drives the piston 11-2 to move downward. At this time, the diaphragm 11-1 expands downward due to the decrease in internal pressure, generating a negative pressure in the detection chamber 15. The inlet check valve 17 closes, the outlet check valve 8 opens, and the pore water in the detection chamber 15 passes through the water outlet chamber 9 and is discharged outside the probe rod 1, preparing for the next collection.

[0040] When conducting in-situ testing operations on the chemical parameters of the pore water environment in the sediment layer in the deep ocean area, install the probe rod 1 and its supporting test rod on the drill rig, and ensure that all connecting components of the probe rod 1 (such as the power-on composite cable 2, the detection chamber 15, the motor 13, the diaphragm pump 11, etc.) are firmly connected. At the same time, check whether the operating states of the motor 13, the diaphragm pump 11, and the microelectrode group 6 are normal. Use a positioning system such as GPS or acoustic positioning to accurately position the drill rig to the target sediment layer area, start the propulsion mechanism, and drive the probe rod 1 to slowly penetrate into the seabed sediment layer. Driven by the propulsion mechanism, the probe rod 1 slowly and steadily penetrates into the seabed sediment layer. The motor 13 starts to drive the piston 11-2 to reciprocate up and down according to the preset program. When the motor 13 drives the piston 11-2 to move upward, the diaphragm 11-1 expands upward due to the increase in internal pressure, the inlet check valve 17 opens, and the outlet check valve 8 closes. The pore water in the sediment layer outside the probe rod 1, under the action of pressure, passes through the filtration of the ceramic filter 10, removes mud, and then flows into the water inlet chamber 18, and is actively collected into the detection chamber 15. As the pore water enters the detection chamber 15, the microelectrode group 6 immediately starts to work and measures various chemical parameters of the pore water (such as pH value, dissolved oxygen concentration, redox potential, etc.) in real time. The collected signals are transmitted to the data acquisition module terminal through the power-on composite cable 2 to complete the measurement process of the chemical parameters of the pore water environment in the sediment layer. After the test is completed, the motor 13 drives the piston 11-2 to move downward. At this time, the diaphragm 11-1 expands downward due to the decrease in internal pressure, generating a negative pressure in the detection chamber 15. The inlet check valve 17 closes, the outlet check valve 8 opens, and the pore water in the detection chamber 15 passes through the water outlet chamber 9 and is discharged outside the probe rod 1 to prepare for the next collection.

[0041] The implementation examples described above only relate to the preferred embodiments of the present invention, and do not limit the concept and scope of the present invention. Without departing from the design idea of the present invention, various changes and improvements made by those of ordinary skill in the art to the technical solutions of the present invention all belong to the protection scope of the present invention. The protection scope of the present invention is given by the appended claims and any equivalents thereof.

Claims

1. An in-situ testing device for environmental chemical physical property parameters of submarine sediment layers, characterized in that: The device includes a probe rod (1), and a power-on composite cable (2), a detection chamber (15), a diaphragm pump (11), and a power-off composite cable (14) which are installed in the probe rod (1) from top to bottom; A microelectrode group (6) is installed inside the detection chamber (15), and the microelectrode group (6) is connected to the power-on composite cable (2); One one-way valve chamber (7) is connected to each side of the detection chamber (15); an inlet one-way valve (17) and an outlet one-way valve (8) are respectively installed in the two one-way valve chambers (7); The lower end of the detection chamber (15) is connected to the diaphragm pump (11). The diaphragm pump (11) controls the opening and closing of the inlet one-way valve (17) and the outlet one-way valve (8) through piston movement, collects and discharges pore water, and the lower end of the diaphragm pump (11) is connected to the power-off composite cable (14).

2. The in-situ testing device for environmental chemical physical property parameters of submarine sediment layers according to claim 1, wherein: The probe rod (1) is cylindrical with a hollow cavity inside. There are two holes on the wall of the probe rod (1). The power-on composite cable (2), the electrode fixing part (3), the microelectrode group (6), the microelectrode connecting part (20), the detection chamber (15), the diaphragm pump (11), the connecting sleeve (12), and the power-off composite cable (14) are all arranged inside the probe rod (1). The probe rod (1) only has the function of detection and perception. During operation, the upper end needs to be connected to a data acquisition and communication module, and the lower end needs to be connected to other test units or directly connected to a drill bit.

3. The in-situ testing device for environmental chemical physical property parameters of submarine sediment layers according to claim 2, characterized in that: The electrode fixing part (3) is an irregular wedge shape with a hollow inside. The upper part is shaped like a bolt and has a groove on the shoulder. After being connected to the microelectrode connecting part (20), vulcanized rubber is poured in. After completely drying, a sealing ring (5) is placed at the groove position, and it passes through the upper opening of the detection chamber (15) from bottom to top. The contact surface between the electrode fixing part (3) and the detection chamber (15) is pressed by a fastening nut (4), and only the power-on composite cable (2) is exposed.

4. The in-situ testing device for environmental chemical physical property parameters of submarine sediment layers according to claim 1, wherein: One end of the one-way valve chamber (7) is connected to the detection chamber (15), and the other end is connected to one side of a perforated cover (16); the lower edge of the other side of the perforated cover (16) is pressed against the probe rod (1); the upper edge of the perforated cover (16) is connected to one side of a ceramic filter (10), and the other side of the ceramic filter (10) is connected to a gland (19).

5. The in-situ testing device for environmental chemical physical property parameters of submarine sediment layers according to claim 1, characterized in that, Both ends of the one-way valve chamber (7) are provided with threads, and there are circular grooves on both sides of the middle protrusion; a sealing ring (5) is installed at the groove position at one end of the one-way valve chamber (7) and is connected to the detection chamber (15) through threads to prevent pore water from seeping into the probe rod (1).

6. The in-situ testing device for environmental chemical physical properties of submarine sediment layers according to claim 1, characterized in that, The diaphragm pump (11) consists of a diaphragm (11-1), a piston (11-2), a ball (11-3), a telescopic rod (11-4), a micro pump (11-5), and an exhaust hole (11-6); The upper end of the diaphragm pump (11) is connected to the lower end of the detection chamber (15), and the diaphragm (11-1) is installed between the diaphragm pump (11) and the detection chamber (15); one end of the telescopic rod (11-4) is connected to the piston (11-2), and the other end is connected to the micro pump (11-5), and an exhaust hole (11-6) is provided on the wall of the diaphragm pump (11); balls (11-3) are installed between the piston (11-2) and the inner wall of the diaphragm pump (11); the lower end of the diaphragm pump (11) is connected to the upper end of the motor (13) through a connecting sleeve (12); the lower end of the motor (13) leads out a lower power-on composite cable (14).

7. The in-situ testing device for environmental chemical physical property parameters of submarine sediment layers according to claim 1, characterized in that, Silicone gaskets are installed on both sides of the diaphragm (11-1) of the diaphragm pump (11), and the lower part of the detection chamber (15) presses the upper part of the diaphragm pump (11) and is tightly connected by screws.

8. The in-situ testing device for environmental chemical physical property parameters of submarine sediment layers according to claim 4, characterized in that, The detection chamber (15), the diaphragm pump (11), and the motor (13) are installed and combined in sequence to form an integrated unit, and then placed into the probe rod (1), ensuring that the two one-way valve chambers (7) on both sides are accurately aligned with the two holes on the wall of the probe rod (1); the perforated cover (16) is a hollow structure. Before installation, a sealing ring (5) is first put on, and then it is pressed into the hole and tightened onto the one-way valve chamber (7); the ceramic filter element (10) is embedded in the perforated cover (16), and then it is pressed tightly with a gland (19), and the fixing is completed by tightening the hexagon socket head cap screw.

9. The in-situ testing device for environmental chemical physical properties of submarine sediment layers according to claim 1, characterized in that The microelectrode group (6) is one or a combination of more than one of a pH electrode, an Ag / AgCl electrode, an Ag / Ag2S electrode, an Eh electrode, a dissolved oxygen electrode, a sulfate electrode, a carbonate electrode, or a temperature electrode, and is fixed to the lower end of the microelectrode connector (20) by welding or epoxy resin adhesion for in-situ detection of various chemical physical property parameters of the pore water environment of marine sediments.

10. The in-situ testing device for environmental chemical physical property parameters of submarine sediment layers according to claim 6, characterized in that, The motor (13) drives the piston (11-2) to reciprocate up and down. When the piston (11-2) moves upward, the diaphragm (11-1) deflects upward due to the increased pressure, the inlet one-way valve (17) opens, and the outlet one-way valve (8) closes. The pore water flows to the water inlet chamber (18) after being filtered by the ceramic filter element (10) and is passively collected into the detection chamber (15); conversely, when the piston (11-2) moves downward, the diaphragm (11-1) deflects downward due to the decreased pressure, the inlet one-way valve (17) closes, and the outlet one-way valve (8) opens. The pore water flows out of the probe rod (1) through the water outlet chamber (9) from the detection chamber (15).

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