Terrestrial heat detection type sediment sampler in polar region under ice water environment

Abstract

The invention discloses a terrestrial heat detection type sediment sampler for a polar region icy water environment, and belongs to the technical field of detection and sampling of the polar region icy water environment, the sampler is composed of a suspension rope, a hammering assembly and a sampling and temperature measuring assembly which are sequentially connected from top to bottom, and sediment sampling and temperature measuring functions are integrated in the same equipment. In-situ temperature measurement is carried out on a sampling layer position while sampling of underwater sediments is achieved, sedimentary stratum sampling and temperature measurement of different depths of a sampling point do not need to be carried out in multiple times, and the construction difficulty and cost are reduced. The self weight of the device can be increased by additionally arranging the balancing weight, the footage depth of the device in a sedimentary stratum by means of the self weight is increased, the balancing weight can be freely released after being lightly lifted, the balancing weight hammers the bearing block downwards and exerts large impact downwards so as to increase the footage depth, the equipment structure and the operation complexity are low, and the engineering cost is saved. Excessive footage of the sampler in the sedimentary strata is avoided through the footage limiting plate, and sampling and temperature measurement of the sedimentary strata with the specified depth are achieved.

Description

Technical Field

[0001] The invention relates to a polar subglacial water environment geothermal detection type sediment sampler, belonging to the technical field of polar subglacial water environment detection and sampling. Background Art

[0002] 98% of the Antarctic continent is covered by ice and snow, which is the largest ice body on Earth and accounts for more than 90% of the total global land ice in modern times. As global warming continues to intensify, the melting rate of the Antarctic ice sheet continues to increase. The main way of ice sheet melting is that the continental ice sheet slides to the ocean to form ice shelves and disintegrates and melts. Therefore, the geothermal flux in the Antarctic subglacial water environment is extremely important for assessing the stability of the Antarctic ice sheet. At present, the method for obtaining geothermal flux parameters in subglacial water environment is to first lower the probe to the bottom of the water and penetrate the sedimentary strata through the surface winch. After the probe reaches a certain depth and completes the temperature measurement operation, the probe is lifted to the surface and the sediment layer temperature data is recovered. After the probe operation is completed, the sediment sampler is lowered by the surface winch, and the sampler is lowered to the bottom of the water and penetrates the sedimentary strata to reach the probe penetration depth. Then the sediment sampler with samples is lifted to the surface, the sediment samples are recovered and the thermal conductivity calibration of the samples at the depth of each temperature measurement point is completed. Finally, the geothermal flux parameters of the detection sampling point are calculated based on the sediment temperature data at different depths measured by the probe and the thermal conductivity of the sediment samples at the corresponding depth. In the actual operation process, since the geothermal parameter measurement and sediment sampling are two operations, the sediment sampling device is easily affected by the water flow and deviates from the geothermal detection point, resulting in data distortion, and the depth of the geothermal probe and the sediment sampler penetrating the sedimentary strata is often difficult to keep consistent, resulting in repeated lowering operations and even invalid data. Therefore, how to simultaneously obtain the stratified temperature data of the underwater sediment target sampling points and the sediment samples at the corresponding depth is a necessary prerequisite for obtaining accurate heat flux parameter detection of the bottom sedimentary strata in lakes, oceans and subglacial water environments. It is also the main solution to reduce the difficulty and construction cost of implementing geothermal flux detection operations in underwater sedimentary strata. Summary of the invention

[0003] The purpose of the present invention is to propose a polar subglacial water environment geothermal detection type sediment sampler for a polar subglacial water environment, in view of the technical difficulties in sampling sedimentary strata due to the need to lower equipment in stages for sediment temperature measurement and sampling, resulting in poor data accuracy and high difficulty in on-site construction. The present invention can complete stratified sampling of sedimentary strata and temperature data collection at corresponding depths in a single equipment implementation process, so as to achieve consistency between the temperature parameters measured in the target sedimentary strata and the collected sediment samples, thereby ensuring the in-situ nature of the geothermal flux parameters at the sampling point, and at the same time simplify the operating process, reduce construction costs and the risk of repeated construction.

[0004] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a polar subglacial water environment geothermal detection type sediment sampler, which is composed of a suspension rope, a hammer assembly and a sampling and temperature measuring assembly connected in sequence from top to bottom; the hammer assembly includes a traction block, a rope guide block, a traction rope, a hammer guide rod, a counterweight block and a bearing block, one end of the traction rope is connected to the traction block, and the other end is connected to the counterweight block after passing through the rope guide block; one end of the hammer guide rod is connected to the rope guide block, and the other end is connected to the bearing block; the counterweight block is used to hammer the bearing block, and the counterweight block is arranged on the hammer guide rod in a manner that it can move up and down relative to the hammer guide rod; the sampling and temperature measuring assembly includes an adapter, a one-way valve, a footage limit plate, a temperature measuring device, a sampling tube, a temperature measuring device protection frame, a claw spring and Cutting head, the adapter is detachably fixed to the bottom end of the bearing block, the adapter is a hollow structure and has a lateral window; the one-way valve is arranged inside the adapter; the footage limit plate is sleeved on the outside of the adapter and is detachably fixedly connected to the adapter, and two sets of temperature measuring devices arranged in parallel and opposite to each other are installed on the footage limit plate; the upper part of the sampling tube is threadedly connected and fixed to the adapter, the sampling tube is composed of an inner liner tube and an outer tube arranged outside the inner liner tube, and the inner liner tube and the outer tube are arranged concentrically and coaxially; the sensor protection frame is installed on the outside of the outer tube, and at least two temperature measuring devices at different depths along the footage depth direction are arranged inside the sensor protection frame; the claw spring is placed at the bottom end of the inner liner tube; the cutting head is threadedly connected to the bottom end of the outer tube and the claw spring is fixed between the cutting head and the outer tube.

[0005] According to a specific embodiment of the present invention, a first eye bolt for connecting a suspension rope is installed on the top of the traction block, and a second eye bolt for connecting a traction rope is installed on the bottom of the traction block.

[0006] According to a specific embodiment of the present invention, the traction rope is connected to the counterweight through a third eye bolt.

[0007] According to a specific embodiment of the present invention, there are at least two counterweight blocks, at least two counterweight blocks are stacked and sleeved on the hammer guide rod, and two adjacent counterweight blocks are connected to each other by bolts.

[0008] According to a specific embodiment of the present invention, the one-way valve includes a one-way valve body, a sealing valve ball and a valve cover. A valve cavity is provided inside the one-way valve body; the sealing valve ball is located in the valve cavity, and the valve cover is arranged on the top of the valve cavity.

[0009] According to a specific embodiment of the present invention, the footage limiting plate and the adapter are fixed by bolt connection.

[0010] According to a specific embodiment of the present invention, the temperature measuring device is composed of a pressure-resistant temperature measuring instrument and a heat-insulating sleeve wrapped around the pressure-resistant temperature measuring instrument.

[0011] Through the above design scheme, the present invention can bring the following beneficial effects: First, the present invention combines sediment sampling and temperature measurement functions in the same equipment, which can realize in-situ temperature measurement of the sampling layer while sampling underwater sediments. There is no need to carry out sediment stratum sampling and temperature measurement at different depths of the sampling points in batches, which reduces the construction difficulty and cost. Second, the present invention adopts in-situ temperature measurement technology to simultaneously obtain the layered temperature data of the underwater sediment target sampling point and the sediment samples at the corresponding depth, thereby ensuring that the geothermal flux parameters are authentic and reliable and enhancing the in-situ nature of the data; Third, the present invention can increase the deadweight of the device by adding a counterweight block. The device relies on its own weight to penetrate the depth of the sedimentary formation. It can also release the counterweight block freely by lightly lifting it, so that the counterweight block hammers the bearing block downward, exerting a large impact downward to increase the penetration depth. The device structure and operation complexity are low, saving engineering costs. Fourthly, the present invention can prevent the sampler from over-advancing in the sediment through the footage limit plate, thereby achieving sampling and temperature measurement of sedimentary strata at a specified depth. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The accompanying drawings herein are used to provide a further understanding of the present invention and constitute a part of the present application. The exemplary embodiments of the present invention and their descriptions are used to understand the present invention and do not constitute improper limitations of the present invention. In the accompanying drawings: Figure 1 This is a schematic diagram of the overall cross-sectional structure of a sediment sampler for geothermal detection of polar subglacial water environments; Figure 2 It is a schematic diagram of the hammer assembly structure; Figure 3 This is a schematic diagram of the structure of the sampling and temperature measurement component; Figure 4 Schematic diagram of the sampling and temperature measurement process using a polar subglacial water environment geothermal detection sediment sampler.

[0013] The markings in the figure are as follows: 1-suspension rope; 2-hammer assembly; 3-sampling and temperature measuring assembly; 4-first lifting eye bolt; 5-traction block; 6-second lifting eye bolt; 7-rope guide block; 8-traction rope; 9-hammer guide rod; 10-third lifting eye bolt; 11-counterweight block; 12-bearing block; 13-adapter; 14-foot limit plate; 15-insulation sleeve; 16-pressure temperature measuring instrument; 17-lining pipe; 18-outer pipe; 19-temperature measuring device protection frame; 20-claw spring; 21-cutting head; 22-sealing valve ball; 23-check valve body; 24-valve cover. DETAILED DESCRIPTION

[0014] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the present invention are clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the present invention is not limited by the following embodiments, and the specific implementation method can be determined according to the technical solution of the present invention and the actual situation. In order to avoid confusing the essence of the present invention, known methods, processes, processes, components and circuits are not described in detail. It should be understood that the terms "first", "second" and "third" are only used for descriptive purposes, and the features defined as "first", "second" and "third" do not represent any order, quantity or importance, but are only used to distinguish different components.

[0015] like Figure 1 As shown, a polar subglacial water environment geothermal detection sediment sampler proposed by the present invention is composed of a suspension rope 1, a hammer assembly 2 and a sampling and temperature measurement assembly 3 connected in sequence from top to bottom; in actual application, the suspension rope 1 is connected to a surface winch.

[0016] like Figure 2 As shown, the hammer assembly 2 includes a traction block 5, a rope guide block 7, a traction rope 8, a hammer guide rod 9, a counterweight block 11 and a bearing block 12. The traction block 5 is provided with a first eyebolt 4 for connecting the suspension rope 1; the end of the traction block 5 away from the suspension rope 1 is provided with a second eyebolt 6 for connecting the traction rope 8; the traction rope 8 passes through the rope guide block 7 and is then connected to the third eyebolt 10 provided on the counterweight block 11; the rope guide block 7 is provided on the hammer guide rod 9. In this embodiment, three counterweight blocks 11 are used, and the three counterweight blocks 11 are connected to each other by bolts and are sleeved on the hammer guide rod 9, and are arranged on the hammer guide rod 9 in a manner that they can move up and down relative to the hammer guide rod 9; the bearing block 12 is located below the counterweight block 11 and is fixed on the hammer guide rod 9.

[0017] like Figure 3As shown, the sampling and temperature measuring assembly 3 includes an adapter 13, a one-way valve, a footage limit plate 14, a temperature measuring device, a sampling tube, a temperature measuring device protection frame 19, a claw spring 20 and a cutting head 21. The adapter 13 is connected to the bottom end of the bearing block 12 and the two are detachably fixedly connected. The adapter 13 is a hollow structure and has a lateral window. The function of the lateral window is to provide a water channel between the one-way valve and the outside world. The one-way valve is arranged inside the adapter 13. The one-way valve includes a sealing valve ball 22, a one-way valve body 23 and a valve cover 24. A valve cavity is arranged inside the one-way valve body 23. The sealing valve ball 22 is located in the valve cavity. The valve cover 24 is arranged at the top of the valve cavity. During the footage, the one-way valve functions to balance the internal pressure of the sampling tube. During the lifting process, the one-way valve functions to close the top of the sampling tube to prevent the sediment sample from escaping from the bottom of the sampling tube. The footage limit plate 14 is sleeved on the outside of the adapter 13, and the footage limit plate 14 is fixedly connected to the adapter 13 by bolts. Two temperature measuring devices arranged in parallel and opposite to each other are arranged on the footage limit plate 14, the purpose is to make the temperature measuring points at different depths. In this embodiment, two stepped holes for placing the temperature measuring devices are opened on the footage limit plate 14, and the temperature measuring device is fixed to the footage limit plate 14 by bolts. The temperature measuring device consists of a pressure-resistant temperature measuring instrument 16 and an insulation sleeve 15 wrapped around the outside of the pressure-resistant temperature measuring instrument 16. The pressure-resistant temperature measuring instrument 16 has a pressure range of up to 7000 meters in water depth. For example, the pressure-resistant temperature measuring instrument 16 adopts a Dow Wan DW12 series temperature meter, and the insulation sleeve 15 is used to achieve heat insulation between the footage limit plate 14 and the pressure-resistant temperature measuring instrument 16 to ensure that the temperature measured by the pressure-resistant temperature measuring instrument 16 is the ambient temperature, rather than the temperature of the footage limit plate 14.

[0018] The sampling tube is composed of an inner liner tube 17 and an outer tube 18 sleeved on the outer liner tube 17. The inner side of the adapter 13 has an inner thread for threaded connection with the outer tube 18 and the inner liner tube 17 of the sampling tube; the temperature measuring device protection frame 19 is installed on the outer tube 18, and four sets of temperature measuring devices at different depths along the depth direction of the footage are arranged inside the temperature measuring device protection frame 19 to ensure that the temperature measuring points of each pressure-resistant temperature measuring instrument 16 are at different depths to achieve temperature measurement of sedimentary formations at different depths. The claw spring 20 is placed at the bottom end of the inner liner tube 17; the cutting head 21 is located at the bottom of the entire sampler, and the cutting head 21 is connected to the outer tube 18 by threads and the claw spring 20 is fixed between the cutting head 21 and the outer tube 18. It should be noted that in the present invention, the claw spring 20 adopts an existing product in the seabed and lake sediment sampler, which belongs to the prior art. Its structural construction will not be elaborated in detail here. The claw spring 20 functions as follows: during the sampler's advancement process, when the sediment sample enters the inner liner tube 17 from the cutting head 21, the claw spring 20 is stretched open by the sediment sample, and the sediment sample can smoothly enter the inner liner tube 17; when the sampler is lifted, the sediment sample inside the inner liner tube 17 falls and pushes the claw spring 20 to close, and finally the bottom of the sediment sample in the inner liner tube 17 is supported by the claw spring 20 to prevent the sediment sample from falling out due to gravity.

[0019] Combine the following Figure 4 The working principle of the present invention is described in detail. Figure 4 This is a schematic diagram of the workflow structure of the entire polar subglacial water environment geothermal detection sediment sampler, which shows the five working states of the polar subglacial water environment geothermal detection sediment sampler. The sampling action is performed in the direction indicated by the arrow in the figure. Figure 4 The middle a corresponds to the lowering stage of the polar subglacial water environment geothermal detection sediment sampler; Figure 4 Middle b corresponds to the state of the pressure-insertion footage stage of the polar subglacial water environment geothermal detection sediment sampler; Figure 4 Middle c corresponds to the hammer penetration stage of the polar subglacial water environment geothermal detection sediment sampler; Figure 4 Middle d corresponds to the temperature measurement stage of the polar subglacial water environment geothermal detection type sediment sampler; Figure 4 Middle e corresponds to the lifting stage of the polar subglacial water environment geothermal detection sediment sampler.

[0020] The working process of the polar subglacial water environment geothermal detection type sediment sampler is divided into five steps: Step 1: lowering stage, after the polar subglacial water environment geothermal detection sediment sampler is assembled on the surface, the sampler is suspended to a certain height above the underwater sedimentary stratum by a suspension rope 1; see Figure 4 Middle a state; Step 2: During the press-in footage stage, continue to execute step 1. Under the action of the sampler's own mass, the sampling and temperature measuring assembly 3 will be pressed into the sedimentary stratum to a certain depth. During this process, the claw spring 20 is stretched open by the surface sediments, and the sampler as a whole will be in a stable insertion state; see Figure 4 Middle b state; Step 3: During the hammering penetration stage, the surface personnel control the continuous pulling up and releasing of the suspension rope 1, so that the counterweight block 11 provided on the hammering assembly 2 continuously impacts the bearing block 12, and the sampling and temperature measuring assembly 3 continuously penetrates in the sedimentary stratum under the repeated impact until the penetration limit plate 14 contacts the surface sediment. Due to the bearing effect of the sediment, the penetration limit plate 14 together with the sampling and temperature measuring assembly 3 will no longer penetrate; see Figure 4 Middle c state; Step 4: Temperature measurement stage. After step 3 is completed, the surface personnel will stop the pulling and releasing operations of the suspension rope 1, keep the sampling and temperature measuring component 3 still in the sedimentary formation until the temperature measured by the sampling and temperature measuring component 3 is consistent with the formation temperature, wait for the pressure-resistant temperature measuring instrument 16 to complete data collection, and then lift the entire sediment sampler through the surface winch. During the lifting process, the sediment sample in the liner tube 17 provided on the sampling and temperature measuring component 3 slides downward inside the liner tube 17 due to its own gravity. During the sliding process of the sediment sample, the opened claw spring 20 is pushed to close. At this time, the liner tube 17, the claw spring 20, the one-way valve body 23, the sealing valve ball 22, and the water and sediment sample inside the liner tube 17 together form a sealing structure to prevent the sediment sample from escaping from the liner tube 17 when the sampler is pulled out of the sediment; see Figure 4 Middle d state; Step 5: In the lifting stage, after completing step 4, the surface personnel use the surface winch to lift the suspension rope 1 and completely pull the sampler out of the sediment formation until the sampler returns to the surface. The surface personnel complete the collection of sediment samples in the liner pipe 17 and the calibration of the thermal conductivity, and the data collection of each pressure-resistant temperature measuring instrument 16. Combined with the temperature and thermal conductivity of sediments in different layers, the sediment geothermal flux parameters of the sampling point can be obtained; see Figure 4 Medium e status.

Claims

1. A polar subglacial water environment geothermal detection type sediment sampler, characterized in that: The sampler comprises a suspension rope (1), a hammer assembly (2) and a sampling and temperature measuring assembly (3) which are connected in sequence from top to bottom; the hammer assembly (2) comprises a traction block (5), a rope guide block (7), a traction rope (8), a hammer guide rod (9), a counterweight block (11) and a bearing block (12); one end of the traction rope (8) is connected to the traction block (5), and the other end passes through the rope guide block (7) and is connected to the counterweight block (11); one end of the hammer guide rod (9) is connected to the rope guide block (7) is connected, and the other end is connected to the bearing block (12); the counterweight block (11) is used to hammer the bearing block (12), and the counterweight block (11) is arranged on the hammering guide rod (9) in a manner that it can move up and down relative to the hammering guide rod (9); the sampling and temperature measuring assembly (3) comprises an adapter (13), a one-way valve, a feed limit plate (14), a temperature measuring device, a sampling tube, a temperature measuring device protection frame (19), a claw spring (20) and a cutting head (21), and the adapter (13) is detachably fixed to At the bottom end of the bearing block (12), the adapter (13) is a hollow structure and has a lateral window; the one-way valve is arranged inside the adapter (13); the footage limit plate (14) is sleeved on the outside of the adapter (13) and is detachably fixedly connected to the adapter (13); two sets of temperature measuring devices arranged in parallel and opposite to each other are installed on the footage limit plate (14); the upper part of the sampling tube is threadedly connected and fixed to the adapter (13), and the sampling tube consists of an inner liner tube (17) and a The invention relates to a sensor protection frame (19) which is installed on the outside of the outer tube (18), and the inner lining tube (17) and the outer tube (18) are arranged coaxially and concentrically; the sensor protection frame (19) is installed on the outside of the outer tube (18), and at least two temperature measuring devices at different depths along the depth direction of the footage are arranged inside the sensor protection frame (19); the claw spring (20) is placed at the bottom end of the inner lining tube (17); the cutting head (21) is connected to the bottom end of the outer tube (18) by means of threads, and the claw spring (20) is fixed between the cutting head (21) and the outer tube (18).

2. The polar subglacial water environment geothermal detection type sediment sampler according to claim 1, characterized in that: A first eyebolt (4) for connecting a suspension rope (1) is installed on the top of the traction block (5), and a second eyebolt (6) for connecting a traction rope (8) is installed on the bottom of the traction block (5).

3. The polar subglacial water environment geothermal detection type sediment sampler according to claim 1, characterized in that: The traction rope (8) is connected to the counterweight (11) via a third eye bolt (10).

4. The polar subglacial water environment geothermal detection type sediment sampler according to claim 1, characterized in that: The number of the counterweight blocks (11) is at least two, and at least two counterweight blocks (11) are stacked and sleeved on the hammer guide rod (9), and two adjacent counterweight blocks (11) are connected to each other by bolts.

5. The polar subglacial water environment geothermal detection type sediment sampler according to claim 1, characterized in that: The one-way valve comprises a one-way valve body (23), a sealing valve ball (22) and a valve cover (24); a valve cavity is provided inside the one-way valve body (23); the sealing valve ball (22) is located in the valve cavity, and the valve cover (24) is arranged on the top of the valve cavity.

6. The polar subglacial water environment geothermal detection type sediment sampler according to claim 1, characterized in that: The footage limiting plate (14) and the adapter (13) are connected and fixed by bolts.

7. The polar subglacial water environment geothermal detection type sediment sampler according to claim 1, characterized in that: The temperature measuring device is composed of a pressure-resistant temperature measuring instrument (16) and a heat-insulating sleeve (15) wrapped around the pressure-resistant temperature measuring instrument (16).

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