Sampling device for measuring redox potential of marine sediment

Abstract

The invention relates to the field of sampling devices, in particular to a sampling device for measuring redox potential of marine sediments, which is characterized in that the sampling device made of a non-metal material comprises a sampling pipe, a material cavity is arranged in the sampling pipe, an overflow groove is arranged on one side of the sampling pipe, the bottom of the sampling pipe is connected with a drill bit, and the top of the sampling pipe is connected with an extension rod; a rail groove is formed in the inner side wall of the material cavity, a sealing film penetrates through the rail groove, and limiting grooves are formed in the positions, located on the two sides of the overflow groove, of the material cavity; an unwinding roller and a winding roller are arranged on the extension rod, one end of the top of the sealing film is connected with the unwinding roller, one end of the bottom of the sealing film is connected with a pull rope, the pull rope penetrates through the limiting groove from bottom to top to be connected with the winding roller, the winding pull rope can drive one end of the bottom of the sealing film to bypass the bottom of the material cavity and then move upwards through the limiting groove, and a packaging structure is formed for the material cavity. The invention is beneficial for solving the problem that the sample collection of the existing oxidation-reduction potential measurement is exposed by air and is influenced by a metal sampling container.

Description

Technical Field

[0001] The invention relates to the field of sampling devices, in particular to a sampling device for measuring the redox potential of marine sediments. Background Art

[0002] The environmental characteristics of marine sediments are generally described by the mechanical composition of the sediments, sediment pH, redox potential Eh, organic matter content (TOC), metal oxide (Fe2O3) ratio, and physical and chemical parameters such as temperature, pressure, and moisture. At the same time, there is a certain correlation between the physical and chemical properties of the sediments, such as texture, compactness, water content, resistivity, and redox potential, and they jointly reflect the physical, chemical, and biological environmental characteristics of the marine sedimentation process. The redox characteristics of seabed sediments are a concentrated reflection of the degree of change in the marine sedimentary environment, and have a great impact on the activities of marine benthic organisms, the marine engineering geological environment, and especially the corrosion process of submarine pipelines.

[0003] Among them, redox potential detection is one of the commonly used detection methods for marine sediments. Before the detection, it is necessary to collect samples of sediments. The current sampling devices mainly adopt box-type, grab-type and column-type. Most of the existing sediment sampling devices are steel structures, and the collected sediment samples are exposed to the air. However, the inventors found in the actual investigation that the sediment redox potential is affected by air exposure and metal sampling containers. Air exposure may cause the evaporation of water in the sediment, thereby affecting the humidity and air permeability of the sediment; gases such as oxygen and carbon dioxide in the air may react with the sediment, changing the concentration of oxidized and reduced substances in the sediment, thereby affecting the potential measurement; air exposure may affect the microbial activity in the sediment, and the metabolic activity of microorganisms has an important influence on the sediment redox potential; metal containers as containers for sediments will affect electron transfer, change the potential value, and affect chemical reactions. Therefore, there is an urgent need for a sampling device for the determination of the redox potential of marine sediments to solve the above problems. Summary of the invention

[0004] The invention provides a sampling device for measuring the redox potential of marine sediments, which is conducive to solving the problem that the sample collection for the existing redox potential measurement is affected by air exposure and metal sampling containers.

[0005] The present invention is achieved in that:

[0006] A sampling device for measuring the redox potential of marine sediments. The sampling device made of non-metallic material comprises a sampling tube, a material cavity is arranged inside the sampling tube, an overflow groove is arranged on one side of the sampling tube, the material cavity and the overflow groove axially penetrate the sampling tube, a drill bit is connected to the bottom of the sampling tube, and an extension rod is connected to the top of the sampling tube; a track groove with an inner hole structure is arranged on the side of the inner side wall of the material cavity away from the overflow groove, a sealing film is penetrated in the track groove, the material cavity is arranged on both sides of the overflow groove, and a limit groove with an opening facing the overflow groove is formed between the limit flange and the inner side wall of the material cavity; The track groove and the limit groove axially penetrate the sampling tube, and the extension rod is provided with two inner cavities, one of which is connected to the track groove and is centrally connected to a unwinding roller, and the other is connected to the limit groove and is centrally connected to a winding roller. One end of the top of the sealing film is connected to the unwinding roller, and one end of the bottom of the sealing film is connected to a pull rope. The pull rope passes through the limit groove from bottom to top and is connected to the winding roller. The winding roller is connected to a crank extending to the outside of the extension rod. The crank handle is rotated in the threshold direction to reel in the pull rope and drive the bottom end of the sealing film to bypass the bottom of the material cavity and then go up through the limit groove, thereby forming a packaging structure for the material cavity.

[0007] On the basis of the above technical solution, the outer contours of the sampling tube and the extension rod are both cylindrical structures, and the drill bit is a cone structure that is wide at the top and narrow at the bottom.

[0008] Based on the above technical solution, the drill bit and the sampling tube are connected in a detachable structure.

[0009] On the basis of the above technical solution, a pull-back hole is provided in the limiting groove, and the pull-back hole is connected with the limiting groove to form a slot hole structure with a "human" shaped cross-sectional profile, and the pull rope is passed through the pull-back hole.

[0010] Based on the above technical solution, the width of the sealing film is greater than the width of the overflow groove.

[0011] On the basis of the above technical solution, a material guide groove is provided in the drill bit, which is connected with the material cavity at the top of the drill bit, and an inclined opening structure is provided in the material guide groove just below the overflow groove of the drill bit.

[0012] On the basis of the above technical solution, a counterweight rod is provided on the top of the extension rod, and a counterweight block is sleeved on the counterweight rod.

[0013] On the basis of the above technical solution, the sealing film is provided with curling edges on the left and right sides, and the drawstring is fixed in a composite manner inside the curling edges.

[0014] On the basis of the above technical solution, a plurality of composite ribs spaced apart along the length direction of the curling are provided on the inner side of the curling.

[0015] Based on the above technical solution, a spiral slot structure is provided on the outer side wall of the drill bit and the sampling tube.

[0016] Compared with the prior art, the present invention has at least the following advantages:

[0017] 1. The sampling device of the present invention effectively avoids the contact between sediment samples and air after collection through an innovative sealing system, thereby reducing the influence of air on the determination of sediment redox potential. At the same time, the non-metallic sealing film and specially designed structure also reduce the interference of metal containers on sediment electron transfer and chemical reactions, thereby improving the accuracy of redox potential determination.

[0018] 2. The present invention provides a sampling tube, a drill bit and an extension rod. The drill bit provides a stable and reliable drilling effect for the device to be inserted into the sediment. The extension rod can provide convenient operation support for sampling in shallow water areas, and can also perform sampling operations in deep water areas through external auxiliary equipment. A material cavity is provided in the sampling tube for collecting sediments, which can effectively protect the sample collection state and reduce the mixing and disruption phenomenon between samples of different depths. This is conducive to the detailed grouping detection of samples, thereby improving the detection accuracy.

[0019] 3. The present invention provides an overflow groove on one side of the sampling tube so that when the sediment enters the cavity, the seawater originally occupied in the cavity can be discharged through the overflow groove in time, thereby ensuring that the sediment can enter the cavity relatively stably and undisturbed to be collected during the insertion process. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 This is a schematic diagram of the three-dimensional structure of a sampling device for measuring the redox potential of marine sediments in one embodiment;

[0022] Figure 2 for Figure 1 A cross-sectional view of

[0023] Figure 3 It is a partial schematic diagram of the track groove and the limiting flange;

[0024] Figure 4 This is a schematic diagram of the installation position of film sealing and stretching in one embodiment;

[0025] Figure 5 This is a schematic diagram of the structure of the sealing film and the pull rope in the guide chute in a non-pulled state in one embodiment;

[0026] Figure 6This is a schematic diagram of the structure of the sealing film and the pull rope in the guide trough in the pull-back state in one embodiment;

[0027] Figure 7 is a schematic diagram of a partial structure of a drill bit in one embodiment;

[0028] Figure 8 Schematic diagram of the structure of the curling edge and the composite rib in one embodiment.

[0029] Markings in the figure: 1. Sampling tube; 11. Material chamber; 12. Overflow groove; 2. Drill bit; 21. Material guide groove; 3. Track groove; 4. Limit flange; 41. Limit groove; 42. Pull-back hole; 5. Extension rod; 51. Unwinding roller; 52. Winding roller; 6. Crank handle; 7. Counterweight rod; 8. Counterweight block; a. Sealing film; a1. Curling; a2. Composite rib; b. Pull rope. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention.

[0031] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0032] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to an element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0033] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] Combination Figure 1 and Figure 2This embodiment discloses a sampling device for measuring the redox potential of marine sediments, which is intended to reduce the impact of air exposure and metal materials on the measurement of the redox potential of sediments.

[0035] The sampling device in this embodiment is made of non-metallic material, specifically PCV material, and the specific structure includes a sampling tube 1. The sampling tube 1 is a cylindrical structure. A material cavity 11 is provided inside the sampling tube 1. The material cavity 11 is used as a collection and accommodating cavity when the sampling tube 1 is inserted into the seabed sediment. The material cavity 11 is located on one side of the sampling tube 1 and is provided with an overflow groove 12. The overflow groove 12 connects the material cavity 11 with the external space to avoid the sediment from being unable to easily enter the material cavity 11 due to the closure of the material cavity 11, and also to avoid the sediment from entering the material cavity 11 due to the closure of the material cavity 11 and interfering with the internal seawater. As a result, the sediment is impacted by seawater after collection, and the internal components are broken up and disordered, affecting subsequent detection.

[0036] It should be noted that the material cavity 11 and the overflow groove 12 axially penetrate the sampling tube 1, so that the sampling tube 1 can fully utilize the structural space and provide a larger sampling space.

[0037] In order to improve the penetration ability of the sampling tube 1, a drill bit 2 is connected to the bottom of the sampling tube 1. The drill bit 2 is a cone structure that is wide at the top and narrow at the bottom. When in use, the pointed structure at the bottom of the drill bit 2 is used to reduce the resistance of the insertion process, so that it can be efficiently inserted into the sediment in the target area.

[0038] An extension rod 5 is connected to the top of the sampling tube 1. The extension rod 5 serves as the top extension structure of the sampling tube 1. A matching structure is arranged inside the extension rod 5 so that the sampling tube 1 can perform a complete sampling operation. Another function of the extension rod 5 is to provide a structural basis for more convenient operation, so that the outer end of the sampling tube 1 has a stable associated structure when it is inserted into and pulled out of the sediment area.

[0039] The outer contours of the sampling tube 1 and the extension rod 5 are both cylindrical structures, which are convenient for carrying and sampling operations.

[0040] Further, combined with Figure 2-4 The sampling tube 1 is also provided with a sealing film a mechanism, specifically: a track groove 3 with an inner hole structure is provided on the inner side wall of the material cavity 11 away from the overflow groove 12. The cross-sectional profile of the track groove 3 in this embodiment is crescent-shaped, and the left and right sides thereof have smooth chamfers. A sealing film a is passed through the track groove 3. The width of the sealing film a is greater than the width of the overflow groove 12, and the sealing film a can slide stably in the track groove 3. The material cavity 11 is provided with limiting flanges 4 on both sides of the overflow groove 12. The cross-sectional profile of the limiting flange 4 is hook-shaped, and a limiting groove 41 with an opening toward the overflow groove 12 is formed between the limiting flange 4 and the inner side wall of the material cavity 11.

[0041] The track groove 3 and the limit groove 41 axially penetrate the sampling tube 1. The track groove 3 is used to allow the sealing film a to move downward, and the limit groove 41 is used to allow the sealing film a to move upward. Figure 2 As shown, the extension rod 5 is provided with two inner cavities (a cover plate which can be opened and closed and controlled is provided on the outer side of the inner cavity, which is not shown in the figure. The function of the cover plate is to facilitate the disassembly and maintenance of the internal structure), one of the inner cavities connected to the track groove 3 is centrally connected to a unwinding roller 51, and the other inner cavity connected to the limiting groove 41 is centrally connected to a winding roller 52. One end of the top of the sealing film a is connected to the unwinding roller 51, and one end of the bottom of the sealing film a is connected to a pull rope b. The pull rope b passes through the limiting groove 41 from bottom to top and is connected to the winding roller 52. The winding roller 52 is connected to a crank 6 extending to the outside of the extension rod 5. Rotating the crank 6 in the threshold direction can reel in the pull rope b and drive the bottom end of the sealing film a to bypass the bottom of the material cavity 11 and then go up through the limiting groove 41, thereby forming a packaging structure for the material cavity 11.

[0042] It should be noted that, in order to enable the pull rope b to stably and reliably pull the sealing film a, a pull-back hole 42 is provided in the limiting groove 41, and the pull-back hole 42 is connected to the limiting groove 41 to form a groove hole structure with a "human"-shaped cross-sectional profile. The pull rope b is passed through the pull-back hole 42. Since the bottom of the pull rope b is connected and fixed to the bottom of the sealing film a, when the top of the pull rope b is rolled up, the bottom of the pull rope b drives the sealing film a to slide upward along the limiting groove 41, and after sliding, a sealing structure is formed for the overflow groove 12. This enables the sediment sample to form a sealed protection structure with the help of the sealing film a after collection to prevent the sample from being exposed to the air.

[0043] like Figure 7 As shown, a material guide groove 21 is provided in the drill bit 2, and the material guide groove 21 is connected with the material cavity 11 at the top of the drill bit 2. The material guide groove 21 is provided with an inclined opening structure just below the overflow groove 12 of the drill bit 2, so that when the drill bit 2 and the sampling tube 1 are inserted into the sediment, the sediment adjacent to the insertion path will smoothly enter the material cavity 11 through the inclined opening structure and the material guide groove 21, thereby improving the sampling fluency and stability.

[0044] Combination Figure 5 and Figure 6 In the specific implementation process, in the initial state, the bottom of the sealing film a is attached to the bottom of the guide groove 21, and the bottom of the pull rope b is also attached to the bottom of the guide groove 21 and bypasses the side opening of the guide groove 21 and enters the pull-back hole 42. Figure 5As shown, when the sampling tube 1 and the drill bit 2 are inserted, the sealing film a and the pull rope b will not have excessive influence on the sediment entering the material chamber 11. When the sampling depth is reached (in this embodiment, the outer surface of the extension rod 5 is provided with corresponding scale lines, which is convenient for the operator to control the corresponding insertion depth in the diving area), the pull rope b is rolled up by the crank 6 and the matching tool, and the pull rope b will drive the sealing film a at the bottom to move upward into the limit groove 41 and continue to move upward. At this time, the structure of the bottom area is as shown in FIG. Figure 6 As shown, since the connection between the track groove 3, the limit groove 41 and the top of the pull-back hole 42 and the extension rod 5 is a connecting hole structure, the sealing film a can partially enter the connecting hole after ascending, so that the material cavity 11 is in a relatively closed state under the coordinated wrapping of the sampling tube 1 itself and the sealing film a. In order to prevent the sealing film a from being scratched when sliding, the sealing film a adopts a wear-resistant composite film structure and material, and the bottom contours of the track groove 3, the limit groove 41 and the pull-back hole 42 adopt a smooth chamfered structure.

[0045] In this embodiment, the drill bit 2 and the sampling tube 1 are in a fixed assembly relationship by hot-melt connection. In other embodiments, a detachable connection structure, such as a threaded connection structure, can be adopted between the drill bit 2 and the sampling tube 1, so that the two can be easily disassembled and replaced to meet the sampling needs in different situations. For example, according to different collection depth requirements, sampling operations can be performed by replacing sampling tubes 1 of different lengths in combination with the drill bit 2 and the extension rod 5.

[0046] Furthermore, a counterweight rod 7 is provided on the top of the extension rod 5. The counterweight rod 7 is a round rod structure. Two counterweight blocks 8 are sleeved on the counterweight rod 7. The function of the counterweight blocks 8 is to provide appropriate downward pressure for the sampling tube 1, so that the sampling tube 1 can move more smoothly when descending in the water and sediment, and can be more easily and efficiently cooperated with the operator's manual or mechanical downward pressure.

[0047] In this embodiment, in order to make the connection between the sealing film a and the drawstring b have better firmness, Figure 8 As shown, the sealing film a is provided with two curling edges a1 on the left and right, and the drawstring b is fixed inside the curling edges a1. In addition, the inner side of the curling edge a1 is provided with a plurality of composite ribs a2 spaced apart along the length direction of the curling edge a1.

[0048] In another embodiment, in order to further improve the smoothness of sampling insertion, a spiral groove structure is provided on the outer wall of the drill bit 2 and the sampling tube 1, which can guide and evacuate the peripheral sediment when inserting the sediment, so as to further reduce the insertion resistance.

[0049] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A sampling device for measuring the redox potential of marine sediments, characterized in that: The sampling device made of non-metallic material comprises a sampling tube (1), wherein a material cavity (11) is provided inside the sampling tube (1), and an overflow groove (12) is provided on one side of the sampling tube (1), the material cavity (11) and the overflow groove (12) axially penetrate the sampling tube (1), a drill bit (2) is connected to the bottom of the sampling tube (1), and an extension rod (5) is connected to the top of the sampling tube (1); a track groove (3) with an inner hole structure is provided on the inner side wall of the material cavity (11) away from the overflow groove (12), a sealing film (a) is penetrated in the track groove (3), and the material cavity (11) is provided with limiting flanges (4) on both sides of the overflow groove (12), and a limiting groove (41) with an opening facing the overflow groove (12) is formed between the limiting flange (4) and the inner side wall of the material cavity (11); the track groove (3) and The limiting groove (41) axially penetrates the sampling tube (1), and the extension rod (5) is provided with two inner cavities, one of which is connected to the track groove (3) and is centrally connected to a reeling roller (51), and the other is connected to the limiting groove (41) and is centrally connected to a reeling roller (52). The top end of the sealing film (a) is connected to the reeling roller (51), and the bottom end of the sealing film (a) is connected to a drawstring (b). The drawstring (b) passes through the limiting groove (41) from bottom to top and is connected to the reeling roller (52). The reeling roller (52) is connected to a crank (6) extending to the outside of the extension rod (5). The crank (6) is rotated in the direction of the threshold value to reel in the drawstring (b), and drive the bottom end of the sealing film (a) to bypass the bottom of the material cavity (11) and then go up through the limiting groove (41), thereby forming a packaging structure for the material cavity (11).

2. A sampling device for measuring the redox potential of marine sediments according to claim 1, characterized in that: The outer contours of the sampling tube (1) and the extension rod (5) are both cylindrical structures, and the drill bit (2) is a cone structure that is wide at the top and narrow at the bottom.

3. A sampling device for measuring the redox potential of marine sediments according to claim 2, characterized in that: The drill bit (2) and the sampling tube (1) are connected in a detachable manner.

4. A sampling device for measuring the redox potential of marine sediments according to claim 1, characterized in that: A pull-back hole (42) is provided in the limiting groove (41), and the pull-back hole (42) is connected to the limiting groove (41) to form a slot hole structure with a "human"-shaped cross-sectional profile, and the pull rope (b) is passed through the pull-back hole (42).

5. A sampling device for measuring the redox potential of marine sediments according to claim 1, characterized in that: The width of the sealing film (a) is greater than the width of the overflow groove (12).

6. A sampling device for measuring the redox potential of marine sediments according to claim 1, characterized in that: The drill bit (2) is provided with a material guide groove (21), which is connected to the material cavity (11) at the top of the drill bit (2), and the material guide groove (21) is provided with an inclined opening structure just below the overflow groove (12) of the drill bit (2).

7. A sampling device for measuring the redox potential of marine sediments according to claim 1, characterized in that: A counterweight rod (7) is provided on the top of the extension rod (5), and a counterweight block (8) is sleeved on the counterweight rod (7).

8. A sampling device for measuring the redox potential of marine sediments according to claim 1, characterized in that: The sealing film (a) is provided with curling edges (a1) on the left and right sides, and the drawstring (b) is fixed in a composite manner inside the curling edges (a1).

9. A sampling device for measuring the redox potential of marine sediments according to claim 8, characterized in that: A plurality of composite ribs (a2) are arranged inside the curling edge (a1) and are distributed at intervals along the length direction of the curling edge (a1).

10. A sampling device for measuring the redox potential of marine sediments according to claim 1, characterized in that: The outer side walls of the drill bit (2) and the sampling tube (1) are provided with spiral slot structures.

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