Undisturbed low-temperature collection device for ice-beneath-attached mud diatom

Abstract

The utility model relates to environmental microorganism and algae collection device technical field discloses a low temperature collection device of ice under attached mud diatom without disturbance, which comprises a sampling cylinder, a slide cavity is formed in the side wall of the sampling cylinder; a collection assembly is installed at the bottom of the sampling cylinder, and the collection assembly comprises a first collection shovel, a second collection shovel and a slide rod; the first collection shovel is slidably connected with the second collection shovel; the slide rod is fixedly installed at one side of the second collection shovel; the slide rod is located in the slide cavity and slides along the slide cavity; the slide rod is fixed to the two ends of the side wall of the sampling cylinder through a fixing member; a sample pushing assembly is installed on a cover, the cover is fixedly connected to the top of the sampling cylinder, and the sample pushing assembly is located inside the sampling cylinder. The collection assembly arranged below the sampling cylinder can reduce the disturbance to the water body and the sediment, preserve the original living environment of diatoms, and the sample pushing assembly arranged in the sampling cylinder can conveniently take out the sample and preserve the integrity of the sample.

Description

Technical Field

[0001] This utility model relates to the technical field of environmental microorganisms and algae collection devices, and more specifically, to a undisturbed low-temperature collection device for diatoms attached to mud under ice. Background Technology

[0002] Diatoms are an important class of single-celled algae, widely distributed in various water bodies around the world. They are key primary producers in aquatic ecosystems. Mud-attached diatoms, also known as benthic diatoms, live at the sediment-water interface and are very sensitive to environmental changes. Their community structure and composition are important biological indicators for assessing water quality and ecosystem health.

[0003] In polar regions, high-altitude areas, or winter lakes and rivers, ice cover makes it difficult to directly obtain underwater sediment samples. Currently, commonly used methods for collecting subglacial sediments include gravity column samplers or grab samplers. However, during the descent and sampling process, gravity column samplers or grab samplers agitate the water and sediments, disrupting the original habitat of diatoms and causing sample distortion. Moreover, it is difficult to accurately collect thin-layer samples from the sediment surface, often resulting in the mixing of a large amount of deep sediments, which dilutes the target diatom community.

[0004] Therefore, there is a need to develop a specialized device that can collect diatoms attached to mud in undisturbed, in-situ under ice. Utility Model Content

[0005] The purpose of this invention is to provide a undisturbed low-temperature sampling device for diatoms attached to sediment under ice, in order to solve the problems existing in the prior art. By setting a sampling component below the sampling tube, the disturbance to the water and sediment can be reduced, and the original living environment of diatoms can be preserved. A sample pushing component is set inside the sampling tube, which can conveniently remove the sample and preserve the integrity of the sample.

[0006] To achieve the above objectives, this utility model provides the following solution: This utility model provides a undisturbed low-temperature sampling device for diatoms attached to ice, comprising: a sampling tube, wherein a sliding cavity is formed in the side wall of the sampling tube; a sampling assembly, wherein the sampling assembly is installed at the bottom of the sampling tube, the sampling assembly includes a first sampling shovel, a second sampling shovel and a sliding rod, the first sampling shovel and the second sampling shovel are slidably connected, the sliding rod is fixedly installed on one side of the second sampling shovel, the sliding rod is located in the sliding cavity and slides along the sliding cavity, the sliding rod is fixed to both ends of the side wall of the sampling tube by a fixing member; and a sample pushing assembly, wherein the sample pushing assembly is installed on a cap, the cap is fixedly connected to the top of the sampling tube, and the sample pushing assembly is located inside the sampling tube.

[0007] According to the present invention, a non-disturbed low-temperature collection device for diatoms attached to ice is provided. The first collection shovel and the second collection shovel are both thin-plate arc-shaped shovels. The inner diameter of the first collection shovel is adapted to the outer diameter of the second collection shovel. The second collection shovel can slide along the inner diameter of the first collection shovel under the push of the slide rod.

[0008] According to the present invention, a undisturbed low-temperature collection device for diatoms attached to ice is provided. The fixing component includes a magnet, a first ferromagnetic body, and a second ferromagnetic body. The magnet is fixedly installed on both sides of the slide rod. The first ferromagnetic body and the second ferromagnetic body are respectively fixedly installed at both ends of the side wall of the sampling tube. The two sides of the magnet are magnetically attracted and fixed to the first ferromagnetic body and the second ferromagnetic body, respectively.

[0009] According to the present invention, a undisturbed low-temperature sampling device for diatoms attached to ice is provided. The sampling assembly includes a pusher plate, a pusher rod, and a connecting cylinder. The pusher plate is located inside the sampling cylinder, the connecting cylinder is fixedly connected to the pusher plate, the pusher rod is detachably connected to the connecting cylinder, and the pusher rod passes through the cover.

[0010] According to the present invention, a undisturbed low-temperature collection device for diatoms attached to ice is provided, wherein the inner side of the connecting cylinder is provided with an internal thread, and the connecting cylinder is threadedly connected to the push rod.

[0011] According to the present invention, a undisturbed low-temperature collection device for diatoms attached to mud under ice is provided, wherein the connecting cylinder passes through the cover and is connected to the push rod.

[0012] According to the present invention, a non-disturbed low-temperature sampling device for diatoms attached to ice is provided, wherein the push plate is a rubber plate and is interference-fitted inside the sampling tube.

[0013] According to the present invention, a undisturbed low-temperature collection device for diatoms attached to ice is provided, wherein both ends of the first collection shovel and the second collection shovel are provided with sealing gaskets.

[0014] The present invention discloses the following technical effects:

[0015] In this invention, a sampling assembly is installed at the bottom of the sampling tube. The first and second sampling shovels are slidably connected. When the first and second sampling shovels are closed, they facilitate downward penetration of the ice layer. After reaching the sampling area, the second sampling shovel slides to overlap with the first sampling shovel, which facilitates the collection of attached diatoms. This allows the sampling shovels to accurately scoop up thin samples from the surface of the sediment, reducing disturbance to the water and sediment, avoiding the mixing of deep sediments, improving the purity of the target diatom community, and providing more accurate samples for subsequent analysis. A sample pushing assembly is set inside the sampling tube to ensure the integrity of the sample during the pushing process. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a structural schematic diagram of the present invention from another angle;

[0019] Figure 3 This is a schematic diagram of the acquisition component in this utility model;

[0020] Figure 4 This is a schematic diagram of another state of the acquisition component in this utility model;

[0021] Figure 5 This is a schematic diagram of the ejector assembly in this utility model;

[0022] Among them, 1. sampling tube; 2. sliding cavity; 3. first sampling shovel; 4. second sampling shovel; 5. sliding rod; 6. cap; 7. push plate; 8. push rod; 9. connecting tube; 10. magnet; 11. first ferromagnetic body; 12. second ferromagnetic body. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] A current device for collecting algae growing under ice in the field includes an upper sleeve, a lower sleeve, a rubber pad, an intermediate connecting pipe, an upper connecting pipe, a cover plate, a crossbar, at least one substrate frame, at least two guide components, and two L-shaped handles. The upper end of the lower sleeve is open, and the lower end is closed. The upper end of the lower sleeve is threaded to the intermediate connecting pipe, and the upper end of the intermediate connecting pipe is fixedly connected to the upper sleeve. The cover plate is located on the upper end face of the upper sleeve. The upper connecting pipe is located at the upper end of the upper sleeve and is fixedly connected to it. Two L-shaped handles are symmetrically arranged on both sides of the upper connecting pipe and are fixedly connected to it. Each L-shaped handle has a horizontal hole, and the crossbar is installed in the horizontal hole. The rubber pad is installed at the lower end of the lower sleeve through a connecting element. Each guide component includes an inner dovetail and an outer dovetail. The matrix frame includes a base plate and two vertical plates. The base plate is located at the bottom between the two parallel vertical plates. The matrix frame has grooves along the inner wall of the vertical plates and the upper end face of the base plate. Two guide components are symmetrically arranged along the axis of the lower sleeve. The upper end of the outer dovetail plate passes through the rubber pad and is fixedly installed on the lower end face of the lower sleeve. The lower end of the inner dovetail plate is fixedly installed on the upper end face of the corresponding vertical plate. The length of the lower sleeve is 0.9m to 1.2m, and the length of the upper sleeve is 0.6m to 0.9m.

[0025] Although the device can perform sampling, it still has the problems of causing great disturbance to the water and sediment and making it inconvenient to remove the sample after sampling. Therefore, there is still an urgent need for a low-temperature sampling device that does not disturb diatoms attached to the ice.

[0026] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] like Figures 1 to 5 As shown, this utility model provides a undisturbed low-temperature sampling device for diatoms attached to ice, comprising: a sampling tube 1, with a sliding cavity 2 formed in the side wall of the sampling tube 1; a sampling assembly, which is installed at the bottom of the sampling tube 1, and includes a first sampling shovel 3, a second sampling shovel 4, and a sliding rod 5, wherein the first sampling shovel 3 and the second sampling shovel 4 are slidably connected, the sliding rod 5 is fixedly installed on one side of the second sampling shovel 4, the sliding rod 5 is located in the sliding cavity 2 and slides along the sliding cavity 2, and the sliding rod 5 is fixed to both ends of the side wall of the sampling tube 1 by a fixing member; and a pushing assembly, which is installed on a cover 6, the cover 6 is fixedly connected to the top of the sampling tube 1, and the pushing assembly is located inside the sampling tube 1.

[0028] The sampling cylinder 1 is a hollow cylindrical structure made of a high-strength, low-thermal-conductivity material, such as polytetrafluoroethylene (PTFE) or stainless steel with an insulation layer, but not limited to these materials, to ensure the structural strength and low-temperature retention performance of the device. A sliding cavity 2 is formed in the side wall of the sampling cylinder 1, extending axially along the cylinder. This cavity accommodates and guides the sliding rod 5 of the sampling component. The cross-sectional shape of the cavity 2 matches the sliding rod 5, ensuring smooth sliding within the cavity and providing a guiding function.

[0029] The collection component is installed at the bottom of the sampling tube 1 and is the core component for achieving undisturbed collection. It includes the first collection shovel 3, the second collection shovel 4, and the slide bar 5.

[0030] Both the first collecting shovel 3 and the second collecting shovel 4 are thin, arc-shaped shovels made of corrosion-resistant, low-friction materials, such as stainless steel or titanium alloy, but not limited to these materials, to reduce resistance and disturbance when inserting into the sediment. The inner diameter of the first collecting shovel 3 is the same as the outer diameter of the second collecting shovel 4, forming a nested structure, allowing the second collecting shovel 4 to slide along the inner diameter of the first collecting shovel 3. This structure ensures the sealing of the collecting shovels when closed and provides stable support during sliding, ensuring the accuracy of the collecting action. Sealing gaskets are provided at both ends of the first collecting shovel 3 and the second collecting shovel 4. In this embodiment, the sealing gaskets are made of rubber, further enhancing the sealing of the first collecting shovel 3 and the second collecting shovel 4 when closed.

[0031] The sliding rod 5 is fixedly installed on one side of the second collection shovel 4, forming a rigid connection with the second collection shovel 4. The length of the sliding rod 5 is greater than the length of the sliding cavity 2, which facilitates the operator's pushing and ensures that it can slide freely within the sliding cavity 2 and reach both ends of the sliding cavity 2. The sliding rod 5 is located inside the sliding cavity 2 and is fixed to both ends of the side wall of the sampling tube 1 by fasteners. The cross-sectional shape of the sliding rod 5 is adapted to the sliding cavity 2 to reduce sliding resistance.

[0032] The fixing component includes a magnet 10, a first ferromagnetic body 11, and a second ferromagnetic body 12. The magnet 10 is fixedly installed on both sides of the slide rod 5. In this embodiment, a high-strength neodymium iron boron magnet 10 is used to provide sufficient adsorption force. The first ferromagnetic body 11 and the second ferromagnetic body 12 are respectively fixedly installed at both ends of the side wall of the sampling tube 1, corresponding to the magnet 10. When the slide rod 5 slides to both ends of the sliding cavity 2, the magnet 10 is magnetically attracted and fixed to the corresponding ferromagnetic body, thereby fixing the collection shovel in the open or closed state and ensuring the stability of the collection process. The fixing component adopts the magnetic attraction fixing method of the magnet 10 and the ferromagnetic body, which is simple and convenient to operate, without the need for complex mechanical structures or additional power sources, and can quickly realize the opening and closing of the collection shovel, improving the collection efficiency.

[0033] The sample pushing component is installed on the cap 6, which is fixedly connected to the top of the sampling cylinder 1. In this embodiment, the cap 6 is fixed to the top of the sampling cylinder 1 by a threaded connection to ensure sealing performance. The sample pushing component is located inside the sampling cylinder 1 and is used to push the collected sample out of the sampling cylinder 1.

[0034] The sample pushing assembly includes a push plate 7, a push rod 8, and a connecting cylinder 9. The push plate 7 is located inside the sampling cylinder 1 and is made of elastic rubber material, such as silicone rubber or fluororubber, which has good sealing and flexibility. The diameter of the push plate 7 is slightly larger than the inner diameter of the sampling cylinder 1, so that the push plate 7 is interference-fitted inside the sampling cylinder 1. This ensures that the push plate 7 is in close contact with the inner wall of the sampling cylinder 1 to prevent sample leakage, and can adapt to the shape of the sampling cylinder 1 during the pushing process to ensure that the sample is pushed out completely. At the same time, it can also prevent the push plate 7 from sliding freely under its own weight and the weight of the connecting cylinder 9 and the push rod 8.

[0035] The connecting tube 9 is welded and fixed to the push plate 7. Under normal conditions, the connecting tube 9 extends upward through the cover 6 to facilitate connection with the push rod 8. The inner side of the connecting tube 9 is provided with internal threads, which are threaded to the push rod 8. The push rod 8 extends through the cover 6, with one end connected to the connecting tube 9 and the other end extending to the outside of the cover 6, making it easy for the operator to apply force. The length of the push rod 8 is greater than the length of the sampling tube 1, ensuring that the push plate 7 can be pushed from the top to the bottom of the sampling tube 1 to completely push out the sample.

[0036] The working principle involves drilling an ice hole slightly larger than the sampling tube 1 in the ice surface. The device is then slowly lowered into the water under the ice through the ice hole. During the process of lowering the device to the surface of the sediment under the ice, the sampling shovel is in a closed state. At this time, the sliding rod 5 is located at one end of the sliding cavity 2, and the magnet 10 is magnetically attracted and fixed to the first ferromagnetic body 11, tightly closing the first sampling shovel 3 and the second sampling shovel 4 to form a closed, inverted cone-shaped bottom. This closed state can reduce the disturbance to the water during the lowering of the device, and at the same time prevent water and sediment from entering the interior of the sampling tube 1, ensuring the accuracy of sampling.

[0037] When the bottom of the device contacts the surface of the sediment, the sampling shovel needs to be opened to collect samples. The operator pushes the slide bar 5 with external force, causing it to slide in the sliding cavity 2, away from the first ferromagnet 11 and towards the second ferromagnet 12. When the slide bar 5 slides to the other end of the sliding cavity 2, the magnet 10 is magnetically attracted and fixed to the second ferromagnet 12. At this time, the second sampling shovel 4 slides along the inner wall of the first sampling shovel 3. The first sampling shovel 3 and the second sampling shovel 4 overlap to form an opening, so that the bottom of the sampling tube 1 is in the open position. Continue to lower the device to complete the sampling.

[0038] After sample collection is completed, the collection shovel needs to be closed to seal the sample. The operator pushes the slide bar 5 again, so that it slides back from the second ferromagnet 12 to the first ferromagnet 11. The magnet 10 is magnetically attracted and fixed to the first ferromagnet 11. The first collection shovel 3 and the second collection shovel 4 close again, sealing the collected sample inside the sampling tube 1. This sealing state ensures that the sample will not leak or be contaminated by the outside during the recovery process.

[0039] After the device is returned to the ice surface, the sample needs to be removed from the sampling tube 1. The slide bar 5 is slid again until the second collection shovel 4 overlaps with the first collection shovel 4, opening the bottom of the sampling tube 1. The operator holds the outer end of the push rod 8 and slowly pushes it downwards. Since the push rod 8 is threadedly connected to the connecting tube 9, the pushing force of the push rod 8 is transmitted to the push plate 7 through the connecting tube 9. The push plate 7 slides downwards inside the sampling tube 1, pushing the collected sample out from the bottom of the sampling tube 1. Because the push plate 7 is made of elastic rubber and is interference-fitted inside the sampling tube 1, the push plate 7 can make close contact with the inner wall of the sampling tube 1 during sliding, ensuring the sample is pushed out completely and preventing damage or contamination during the process.

[0040] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0041] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A undisturbed low-temperature collection device for diatoms attached to mud under ice, characterized in that, include: The sampling tube (1) has a sliding cavity (2) on its side wall; A collection component is installed at the bottom of the sampling tube (1). The collection component includes a first collection shovel (3), a second collection shovel (4), and a slide rod (5). The first collection shovel (3) is slidably connected to the second collection shovel (4). The slide rod (5) is fixedly installed on one side of the second collection shovel (4). The slide rod (5) is located in the sliding cavity (2) and slides along the sliding cavity (2). The slide rod (5) is fixed to both ends of the side wall of the sampling tube (1) by a fixing member. The sample pushing component is installed on the cover (6), the cover (6) is fixedly connected to the top of the sampling cylinder (1), and the sample pushing component is located inside the sampling cylinder (1).

2. The undisturbed low-temperature collection device for diatoms attached to ice as described in claim 1, characterized in that: Both the first collection shovel (3) and the second collection shovel (4) are thin, arc-shaped shovels. The inner diameter of the first collection shovel (3) is adapted to the outer diameter of the second collection shovel (4). The second collection shovel (4) can slide along the inner diameter of the first collection shovel (3) under the push of the slide bar (5).

3. The undisturbed low-temperature collection device for diatoms attached to ice under claim 1, characterized in that: The fixing component includes a magnet (10), a first ferromagnetic body (11), and a second ferromagnetic body (12). The magnet (10) is fixedly installed on both sides of the slide bar (5). The first ferromagnetic body (11) and the second ferromagnetic body (12) are respectively fixedly installed at both ends of the side wall of the sampling tube (1). The magnet (10) is magnetically attracted and fixed to the first ferromagnetic body (11) and the second ferromagnetic body (12) on both sides respectively.

4. The undisturbed low-temperature collection device for diatoms attached to ice as described in claim 1, characterized in that: The sample pushing assembly includes a push plate (7), a push rod (8), and a connecting cylinder (9). The push plate (7) is located inside the sampling cylinder (1). The connecting cylinder (9) is fixedly connected to the push plate (7). The push rod (8) is detachably connected to the connecting cylinder (9). The push rod (8) passes through the cover (6).

5. The undisturbed low-temperature collection device for diatoms attached to ice as described in claim 4, characterized in that: The inner side of the connecting cylinder (9) is provided with an internal thread, and the connecting cylinder (9) is threadedly connected to the push rod (8).

6. The undisturbed low-temperature collection device for diatoms attached to ice under claim 4, characterized in that: The connecting cylinder (9) passes through the cover (6) and is connected to the push rod (8).

7. The undisturbed low-temperature collection device for diatoms attached to ice as described in claim 4, characterized in that: The push plate (7) is a rubber plate, and the push plate (7) is interference-fitted inside the sampling cylinder (1).

8. The undisturbed low-temperature collection device for diatoms attached to ice under claim 1, characterized in that: Both ends of the first collection shovel (3) and the second collection shovel (4) are provided with sealing gaskets.

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