Soil sediment sample pretreatment device

Abstract

The invention relates to the technical field of marine soil pretreatment, and particularly discloses a soil sediment sample pretreatment device which comprises a box body structure including a bottom box, a functional box and a top box, the top box is provided with a plurality of feeding pipes and a driving assembly, the driving assembly is connected with an output shaft, and the output shaft penetrates through the bottom box to be rotationally connected with the inner bottom of the bottom box; a discharging pipe is arranged on the bottom box, and the interior of the function box sequentially comprises a screening structure, a retarding function structure and a filtering function structure which are detachably connected with the function box from top to bottom. The filtering function structure comprises a lead screw pair structure arranged on the basis of the output shaft, a filter screen structure arranged in a sliding manner on the basis of the lead screw pair structure, an upper contact assembly used for extruding and flattening the filter screen structure to discharge water, and a lower contact assembly used for splitting soil sediments on the filter screen structure; according to the device, the problems that the drying efficiency is low and the interior is still wet after being dried into blocks in the traditional marine soil drying pretreatment link are solved.

Description

Technical Field

[0001] The present application relates to the technical field of marine soil pretreatment, and specifically discloses a soil sediment sample pretreatment device. Background Art

[0002] On Earth, the ocean covers more than 70% of the Earth's surface and is the main driving force of weather and climate. A slight fluctuation in ocean temperature may lead to drastic changes in weather and climate around the world. Therefore, the protection of the ocean is very important. In the protection of the ocean, it is necessary to put forward the sediments in the ocean for monitoring and analysis of the ocean. Marine sediments refer to the general term for seabed sediments formed by various marine sedimentation. They are materials deposited on the seabed with seawater as the medium. Before conducting an analysis and investigation of marine sediments, the samples of marine sediments are often pre-processed to ensure that the samples meet the requirements of the testing equipment.

[0003] When talking about soil sediments, we have to talk about soil testing;

[0004] Regarding soil testing: various testing methods are used to perform elemental analysis on soil samples, such as: determination of total chromium in soil quality by flame atomic absorption method GB / T17137-1997, determination of copper and zinc in soil quality by flame atomic absorption spectrophotometry GB / T17138-1997, determination of nickel in solid waste by direct inhalation flame spectrophotometry GB / T15555.9-1997;

[0005] The above detection methods all require the samples to be in the state of air-dried particles. The biggest difference between marine soil and terrestrial soil is that marine soil is mainly composed of wet sediment deposition, while terrestrial soil is mainly composed of weathered terrestrial rocks.

[0006] Therefore, for marine soil, the most prioritized pretreatment step is to separate the wet sediment. However, after a lot of practice, it is found that there are certain problems in this step: first, in order to prevent some organic components of marine soil from being inactivated, the temperature can only be around 35 degrees, not 100 degrees or 200 degrees. This will damage the organic components of the soil sample and directly affect the soil analysis results;

[0007] If the drying temperature is around 35 degrees, the soil will become smelly and moldy due to being left in the soil drying box for a long time. This will pollute the laboratory environment and affect the health of laboratory operators.

[0008] Moreover, even after a long period of waiting, the marine soil mainly composed of moist silt deposits often appears in lumpy lumps, and the interior of these lumps is often not air-dried. Therefore, they need to be broken up again and dried again, and the steps are very troublesome and complicated. For this reason, the inventor proposes a more reasonable marine soil pretreatment device. In view of this, the inventor proposes a soil sediment sample pretreatment device. Summary of the invention

[0009] The purpose of the present invention is to solve the problems of low drying efficiency in the drying pretreatment stage of traditional marine soil and the fact that the interior of the soil is still moist after being dried into blocks, which leads to sample rework or sample unusability.

[0010] In order to achieve the above object, the present invention provides the following basic scheme:

[0011] A soil sediment sample pretreatment device, comprising

[0012] Box structure: including a bottom box, a functional box and a top box, and the bottom box, the functional box and the top box are all detachably connected. The top box is provided with a plurality of feed pipes and a drive assembly, the drive assembly is connected with an output shaft, the output shaft passes through the bottom box and is rotatably connected with the bottom of the bottom box, and the bottom box is provided with a discharge pipe;

[0013] The interior of the function box includes, from top to bottom, a screening structure, a deceleration function structure and a filtering function structure which are detachably connected to the function box;

[0014] The filtering functional structure includes a screw substructure based on the output shaft, a filter screen structure based on the sliding arrangement of the screw substructure, an upper contact component for squeezing and flattening water out of the filter screen structure, and a lower contact component for splitting soil sediments on the filter screen structure. The functional box is located on the inner wall of the filtering functional structure and is provided with a heating structure for heating soil sediments.

[0015] The principles and effects of this basic solution are:

[0016] 1. Compared with the prior art, the device has a simple structure and an ingenious design. The device is a special pretreatment device for marine soil, which can realize the drying of marine soil and solve the problems of low drying efficiency and the internal moisture of the traditional marine soil after drying into blocks in the drying pretreatment link, which leads to sample rework or sample unusability.

[0017] 2. Compared with the prior art, the present device is provided with a screening structure, which can pre-treat and screen out stones, biological debris or branches that are insoluble in the mud-water mixture before drying, which is conducive to accelerating the subsequent drying rhythm and ensuring that the heating resources can act efficiently on the mud-water mixture, thereby achieving rapid drying of the mud-water mixture.

[0018] 3. Compared with the prior art, the present device is provided with a deceleration function structure. The deceleration function structure utilizes the principle that objects of different masses have different densities and thus different flow velocities, thereby realizing the preferential falling of most of the mud-water mixture on the deceleration function structure. Some particles that can pass through the screening structure will be affected by the deceleration function structure and will be retained, which is beneficial to the subsequent drying of the mud-water mixture.

[0019] 4. Compared with the prior art, the present device is provided with a filtering function structure, a driving component and a screw substructure. The driving component is manual, which is the advantage of this case. The reason why a motor is not used is because there are uncontrollable factors in the motor. Since this case requires the screw substructure to move up and down, the use of a motor requires the installation of a forward and reverse controller, and the cost cannot be controlled. After manual operation is adopted, the filter mesh structure can be made to contact the lower component or the upper component, thereby achieving different effects on the filter mesh structure.

[0020] 5. Compared with the prior art, the filter mesh structure is in contact with the upper contact component, so that the mud-water mixture on the filter mesh structure is squeezed, the water is drained more quickly, the solid formation in the mud-water mixture and the separation from the water are accelerated, and the soil mixture is squeezed by the upper contact component to achieve flattening of the soil mixture on the filter mesh structure.

[0021] 6. Compared with the prior art, the filter screen structure is in contact with the lower contact assembly, so that the mud-water mixture on the filter screen structure is split by the impact force, reducing the phenomenon that the soil mixture still has water inside due to lumps.

[0022] Furthermore, the driving component is a crank, which is coaxially connected to the output shaft, and the output shaft includes a smooth shaft section and a threaded shaft section, and the threaded shaft section is arranged inside the function box to drive the screw pair structure to move up and down. The screw pair structure is moved up and down, and the crank is used as the driving component to achieve a more controllable moving distance.

[0023] Furthermore, the functional box includes an upper box and a lower box, the upper box and the lower box are integrally formed, one end of the upper box is provided with a first external thread connected to the upper box thread, the side of the lower box away from the first external thread is provided with a second external thread connected to the bottom box thread, one end of the bottom box away from the upper box is fixed with a plurality of support columns, and the free ends of the support columns are provided with a plurality of anti-skid pads, so as to realize the whole installation and disassembly, and facilitate the later maintenance and replacement of parts.

[0024] Furthermore, the deceleration function structure includes a symmetrically arranged bracket and a fan-shaped funnel, one end of the bracket is fixedly connected to the fan-shaped funnel, and the other end of the bracket is installed on the inner wall of the function box, the optical axis section is installed through the through hole of the fan-shaped funnel and a scraper is arranged at the passing position, and the inner side surface of the fan-shaped funnel is evenly provided with friction particles, so as to achieve the retention of small particles of non-soil materials in the mud-water mixture.

[0025] Furthermore, the screening structure is arranged above the deceleration function structure, and comprises a screening frame detachably connected to the inner wall of the function box and a connecting hole for the optical axis section to pass through the screening frame, a rotating bearing is arranged at the connection between the connecting hole and the optical axis section, and the optical axis section is symmetrically fixed with a clearing plate on the upper side of the screening frame, so as to realize the blocking of large particles of non-soil materials in the mud-water mixture, and facilitate the subsequent drying steps.

[0026] Furthermore, the screw auxiliary structure includes a sliding block and a stabilizing rod which are threadedly connected to the threaded shaft segment. The stabilizing rod passes through the sliding block and is connected to the bottom box and the top box respectively.

[0027] Furthermore, the filter screen structure is fixedly connected around the sliding block, and the filter screen structure includes an inclined water-leaking circular plate arranged around the sliding block, a material baffle plate arranged at the outer end of the inclined water-leaking circular plate, and a flexible filter screen fixedly connected to the upper side of the inclined water-leaking circular plate, and one end of the material baffle plate is provided with a mounting block, and the mounting block is slidably connected to the inner wall of the functional box.

[0028] Furthermore, the upper contact assembly includes a first sleeve ring sleeved on the threaded shaft segment, a first inclined plate fixedly connected to the periphery of the first sleeve ring and having the same inclination as the inclined water leakage circular ring plate, and a plurality of springs arranged below the first inclined plate.

[0029] Furthermore, the lower contact assembly includes a second ring sleeved on the threaded shaft segment, a second inclined plate fixedly connected around the second ring and having the same inclination as the inclined water-leaking circular ring plate, and a plurality of protrusions arranged above the second inclined plate, wherein the protrusions are arranged alternately with the positions of the springs and the protrusions can pass through the inclined water-leaking circular ring plate to contact the flexible filter screen.

[0030] Furthermore, the heating structure includes an electric heating resistance wire group, a temperature sensor and a control panel. The temperature sensor is placed in the function box, the electric heating resistance wire group is located on the inner wall of the function box, and the control panel is installed outside the bottom box. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0032] Figure 1 A schematic structural diagram of a soil sediment sample pretreatment device proposed in an embodiment of the present application is shown;

[0033] Figure 2 A schematic front view of a soil sediment sample pretreatment device proposed in an embodiment of the present application is shown;

[0034] Figure 3 A schematic diagram of the structure and installation position of a sieving structure in a soil sediment sample pretreatment device proposed in an embodiment of the present application is shown;

[0035] Figure 4 A schematic diagram of a structure of a slowing function structure in a soil sediment sample pretreatment device proposed in an embodiment of the present application is shown;

[0036] Figure 5 A schematic diagram of a heating structure in a soil sediment sample pretreatment device proposed in an embodiment of the present application is shown;

[0037] Figure 6 A schematic diagram of a filtering function structure in a soil sediment sample pretreatment device proposed in an embodiment of the present application is shown;

[0038] Figure 7 A schematic plan view of a first ring in a soil sediment sample pretreatment device proposed in an embodiment of the present application is shown;

[0039] Figure 8 A front schematic diagram of a first ring in a soil sediment sample pretreatment device proposed in an embodiment of the present application is shown;

[0040] Fig. 9 A schematic plan view of a second set of rings in a soil sediment sample pretreatment device proposed in an embodiment of the present application is shown;

[0041] Fig.10 A schematic structural diagram of a filter screen structure in a soil sediment sample pretreatment device proposed in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0042] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation mode, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0043] The figure marks in the drawings of the specification include: bottom box 1, support column 2, anti-slip pad 3, control panel 4, lower box 5, second external thread 6, upper box 7, first external thread 8, top box 9, feed pipe 10, output shaft 11, crank 12, connecting block 1201, discharge pipe 13, connecting screw 1301, threaded hole 14, screening frame 15, rotating bearing 16, obstacle clearing plate 17, mounting boss 18, functional box 19, bracket 20, fan-shaped funnel 21, friction particles 22, scraper 23, electric heating resistance wire group 24, stabilizer bar 25, first ring 26, threaded section 27, first inclined plate 28, sliding block 29, filter screen structure 30, flexible filter screen 3001, inclined water leakage ring plate 3002, material baffle plate 3004, mounting block 3005, second ring 31, second inclined plate 32, fixed point 33, spring 34, protrusion 35.

[0044] Implementation example Figure 1-Figure 10 As shown:

[0045] A soil sediment sample pretreatment device, comprising

[0046] Box structure: including a bottom box 1, a function box 19 and a top box 9, and the bottom box 1, the function box 19 and the top box 9 are all detachably connected, the top box 9 is provided with a plurality of feed pipes 10 and a drive assembly, the drive assembly is connected with an output shaft 11, the output shaft 11 passes through the bottom box 1 and is rotatably connected to the bottom of the bottom box 1, and the bottom box 1 is provided with a discharge pipe 13;

[0047] Specifically: the feed pipe 10 is used to input the collected soil raw materials, and the discharge pipe 13 is used to discharge water or collect the discharged water. Figure 1 and Figure 2 As shown, the driving component is a crank 12, and the crank 12 is coaxially connected to the output shaft 11, and the output shaft 11 includes a smooth shaft section and a threaded shaft section.

[0048] In terms of connection: the functional box 19 includes an upper box 7 and a lower box 5, and the upper box 7 and the lower box 5 are integrally formed. One end of the upper box 7 is provided with a first external thread 8 which is threadedly connected to the top box 9. The side of the lower box 5 away from the first external thread 8 is provided with a second external thread 6 which is threadedly connected to the bottom box 1. One end of the bottom box 1 away from the top box 9 is fixedly connected to a plurality of support columns 2, and the free ends of the support columns 2 are provided with a plurality of anti-slip pads 3.

[0049] The interior of the function box 19 includes, from top to bottom, a screening structure, a slowing function structure and a filtering function structure which are detachably connected to the function box 19;

[0050] Specifically: the screening structure is installed in the upper box 7, and the slowing function structure and the filtering function structure are installed in the lower box 5;

[0051] Regarding the screening structure, the screening structure is arranged above the deceleration function structure, and the screening structure includes a screening frame 15 detachably connected to the inner wall of the upper box 7 and a connecting hole opened on the screening frame 15 for the optical axis segment to pass through, and a rotating bearing 16 is provided at the connection between the connecting hole and the optical axis segment. The optical axis segment is located on the upper side of the screening frame 15 and is symmetrically fixed with an obstacle clearing plate 17.

[0052] Specifically: a connecting block 1201 is provided on the screening frame 15, a threaded hole 14 is provided on the connecting block 1201, a mounting boss 18 is provided on the inner wall corresponding to the functional box 19, and after the mounting boss 18 is connected to the connecting block 1201, a connecting screw 1301 is used to connect the connecting block 1201 and the mounting boss 18.

[0053] Specifically, the screening frame 15 is used to block large particles of solid matter, and the obstacle removal plate 17 is used to change the screening position of the screening frame 15 to prevent the mud-water mixture from falling into this position.

[0054] Regarding the deceleration functional structure, the deceleration functional structure includes a symmetrically arranged bracket 20 and a fan-shaped funnel 21, one end of the bracket 20 is fixedly connected to the fan-shaped funnel 21, and the other end of the bracket 20 is installed on the inner wall of the lower box 5, the optical axis segment is installed through the through hole of the fan-shaped funnel 21 and a scraper 23 is arranged at the passing position, and the inner side surface of the fan-shaped funnel 21 is evenly provided with friction particles 22.

[0055] Specifically: the scraper 23 is used when the device is about to end, to achieve the removal of small particles of solid matter on the deceleration function structure, and the structure of the fan-shaped funnel 21 and the friction particles 22 are used to make the mud-water mixture fall and the small particles of solid matter are blocked by the friction particles 22 and stay on the inner side of the fan-shaped funnel 21.

[0056] The filtering functional structure includes a screw substructure arranged based on the output shaft 11, a threaded shaft section arranged inside the functional box 19 to drive the screw substructure to move up and down, a filter mesh structure 30 arranged based on the sliding of the screw substructure, an upper contact component used to squeeze and flatten the water out of the filter mesh structure 30, and a lower contact component used to split the soil sediment on the filter mesh structure 30. The functional box 19 is provided with a heating structure for heating the soil sediment on the inner wall of the filtering functional structure.

[0057] Specifically: the screw substructure includes a sliding block 29 and a stabilizing rod 25 threadedly connected to the threaded shaft segment, the stabilizing rod 25 passes through the sliding block 29 and is respectively connected to the bottom box 1 and the top box 9, the filter screen structure 30 is fixedly connected to the sliding block 29, the filter screen structure 30 includes an inclined water-leaking circular plate 3002 arranged around the sliding block 29, a baffle plate 3004 arranged at the outer end of the inclined water-leaking circular plate 3002 and a flexible filter screen 3001 fixedly connected to the upper side of the inclined water-leaking circular plate 3002, one end of the baffle plate 3004 is provided with a mounting block 3005, and the mounting block 3005 is slidably connected to the inner wall of the functional box 19.

[0058] Specifically, the upper contact assembly includes a first sleeve ring 26 sleeved on the threaded shaft segment, a first inclined plate 28 fixedly connected to the first sleeve ring 26 and having the same inclination as the inclined water leakage circular ring plate 3002 , and a plurality of springs 34 arranged below the first inclined plate 28 .

[0059] Specifically: the lower contact assembly includes a second ring 31 sleeved on the threaded shaft segment, a second inclined plate 32 fixedly connected to the second ring 31 and having the same inclination as the inclined water-leaking circular ring plate 3002, and a plurality of protrusions 35 arranged above the second inclined plate 32, wherein the protrusions 35 and the springs 34 are arranged in an alternating manner and the protrusions 35 can pass through the inclined water-leaking circular ring plate 3002 and contact the flexible filter screen 3001.

[0060] The first inclined plate 28 and the second inclined plate 32 are the same, and both are provided with fixing points 33 on the outer periphery for fixing to the inner wall of the lower box 5 .

[0061] Specifically: the heating structure includes an electric heating resistance wire group 24, a temperature sensor and a control panel 4, the temperature sensor is placed in the function box 19, the electric heating resistance wire group 24 is located on the inner wall of the function box 19, and the control panel 4 is installed outside the bottom box 1.

[0062] Specific implementation process:

[0063] In the first step, the soil mixture enters the feed pipe 10 and falls on the screening structure, which screens out large solid impurities from the soil mixture. Then the soil mixture passes through the structure and falls on the slow-down function structure, which retains small solid impurities from the soil mixture. The remaining mud-water mixture enters the filtering function structure.

[0064] The second step is to shake the handle 12 to the left, and the sliding block 29 moves upward, so that the inclined water-leaking circular plate 3002 moves upward. The inner wall of the function box 19 is provided with a sliding groove. Since one end of the baffle plate 3004 is provided with a mounting block 3005, the mounting block 3005 slides in the sliding groove, and then contacts the first inclined plate 28 in the upper contact assembly, and squeezes the spring 34. The spring 34 is compressed, so that the flexible filter 3001 located on the upper side of the inclined water-leaking circular plate 3002 quickly squeezes out water, and the retained soil begins to form quickly. And due to the existence of the spring 34, the spring 34 prevents the soil from forming large blocks;

[0065] In the third step, after squeezing out water for a period of time, the electric heating resistance wire group 24 is controlled at a temperature of 35 degrees to start the natural drying that is most beneficial to the microorganisms;

[0066] In the fourth step, the handle 12 is shaken to the right, and the sliding block 29 moves downward, so that the inclined water-leaking circular plate 3002 moves downward, and the squeezed spring 34 is reset to give a reaction force to the soil, so that the soil is split more loosely, and then continues to move downward. The protrusion 35 can pass through the inclined water-leaking circular plate 3002 and contact the flexible filter screen 3001, so that certain positions of the flexible filter screen 3001 are lifted up, accelerating the dispersion of soil blocks. In addition, since the positions of the protrusion 35 and the spring 34 are staggered, the dispersion of the soil blocks is inconsistent with the point in the third step where the spring 34 blocks the soil from splitting into large blocks. Therefore, the dispersion of the soil blocks can be further accelerated.

[0067] Finally, the device is disassembled and the soil located on the flexible filter 3001 is collected, i.e., the sample soil.

[0068] The device solves the problems of low drying efficiency in the drying pretreatment stage of traditional marine soil and the internal moisture remaining after drying into blocks, which leads to sample rework or sample unusability.

[0069] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A soil sediment sample pretreatment device, characterized in that: include Box structure: including a bottom box, a functional box and a top box, and the bottom box, the functional box and the top box are all detachably connected. The top box is provided with a plurality of feed pipes and a drive assembly, the drive assembly is connected with an output shaft, the output shaft passes through the bottom box and is rotatably connected with the bottom of the bottom box, and the bottom box is provided with a discharge pipe; The interior of the function box includes, from top to bottom, a screening structure, a deceleration function structure and a filtering function structure which are detachably connected to the function box; The filtering functional structure includes a screw substructure based on the output shaft, a filter screen structure based on the sliding arrangement of the screw substructure, an upper contact component for squeezing and flattening water out of the filter screen structure, and a lower contact component for splitting soil sediments on the filter screen structure. The functional box is located on the inner wall of the filtering functional structure and is provided with a heating structure for heating soil sediments.

2. A soil sediment sample pretreatment device according to claim 1, characterized in that: The driving component is a crank, which is coaxially connected to the output shaft. The output shaft includes a smooth shaft section and a threaded shaft section. The threaded shaft section is arranged inside the function box to drive the lead screw pair structure to move up and down.

3. A soil sediment sample pretreatment device according to claim 2, characterized in that: The functional box includes an upper box and a lower box, which are integrally formed. One end of the upper box is provided with a first external thread connected to a top box thread. A side of the lower box away from the first external thread is provided with a second external thread connected to a bottom box thread. One end of the bottom box away from the top box is fixedly connected to a plurality of support columns, and the free ends of the support columns are provided with a plurality of anti-slip pads.

4. A soil sediment sample pretreatment device according to claim 2, characterized in that: The deceleration function structure includes a symmetrically arranged bracket and a fan-shaped funnel, one end of the bracket is fixedly connected to the fan-shaped funnel, and the other end of the bracket is installed on the inner wall of the function box. The optical axis segment is installed through the through hole of the fan-shaped funnel and a scraper is arranged at the passing position. The inner side surface of the fan-shaped funnel is evenly provided with friction particles.

5. A soil sediment sample pretreatment device according to claim 4, characterized in that: The screening structure is arranged above the deceleration function structure, and the screening structure includes a screening frame detachably connected to the inner wall of the function box and a connecting hole opened on the screening frame for the optical axis segment to pass through, a rotating bearing is provided at the connection between the connecting hole and the optical axis segment, and the optical axis segment is symmetrically fixed with an obstacle clearing plate on the upper side of the screening frame.

6. A soil sediment sample pretreatment device according to any one of claims 2, 3, 4 or 5, characterized in that: The screw auxiliary structure comprises a sliding block and a stabilizing rod which are threadedly connected to the threaded shaft section. The stabilizing rod passes through the sliding block and is respectively connected to the bottom box and the top box.

7. A soil sediment sample pretreatment device according to claim 6, characterized in that: The filter screen structure is fixedly connected around the sliding block, and includes an inclined water-leaking circular plate arranged around the sliding block, a material baffle plate arranged at the outer end of the inclined water-leaking circular plate, and a flexible filter screen fixedly connected to the upper side of the inclined water-leaking circular plate. A mounting block is provided at one end of the material baffle plate, and the mounting block is slidably connected to the inner wall of the functional box.

8. A soil sediment sample pretreatment device according to claim 7, characterized in that: The upper contact assembly comprises a first sleeve ring sleeved on the threaded shaft section, a first inclined plate fixedly connected to the periphery of the first sleeve ring and having the same inclination as the inclined water leakage circular ring plate, and a plurality of springs arranged below the first inclined plate.

9. A soil sediment sample pretreatment device according to claim 8, characterized in that: The lower contact assembly includes a second sleeve ring sleeved on the threaded shaft segment, a second inclined plate fixedly connected around the second sleeve ring and having the same inclination as the inclined water-leaking circular ring plate, and a plurality of protrusions arranged above the second inclined plate. The protrusions are arranged alternately with the positions of the springs and the protrusions can pass through the inclined water-leaking circular ring plate to contact the flexible filter screen.

10. The soil sediment sample pretreatment device according to claim 1, characterized in that: The heating structure comprises an electric heating resistance wire group, a temperature sensor and a control panel. The temperature sensor is placed in the function box, the electric heating resistance wire group is located on the inner wall of the function box, and the control panel is installed outside the bottom box.

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