Sieving and stirring integrated device for preparing methane hydrate soil sample and preparation method

Abstract

The invention belongs to the technical field of low-temperature natural gas hydrate soil sample preparation, and particularly relates to a screening and stirring integrated device for preparing a methane hydrate soil sample and a preparation method. The feeding end of the conveying system is communicated with the frost outlet of the frost preparation system, and the conveying system is used for conveying the supported frost particles; the feeding end of the vibration screening system communicates with the discharging end of the conveying system, and the vibration screening system is used for screening the frost particles; the feeding end of the soil sample and frost mixing system is communicated with the discharging end of the vibration screening system, and the vibration screening system conveys the frost particles with the specified particle size into the soil sample and frost mixing system, so that the soil sample and frost mixing system mixes the frost particles with the specified particle size with the soil sample; and the control and automation system is electrically connected with the frost preparation system, the conveying system, the vibration screening system and the soil sample frost mixing system. The invention further discloses a preparation method of the methane hydrate soil sample.

Description

Technical Field

[0001] The present invention belongs to the technical field of low-temperature natural gas hydrate soil sample preparation, and in particular relates to a screening and stirring integrated device and a preparation method for preparing methane hydrate soil samples. Background Art

[0002] Methane hydrates are cage-like, ice-like compounds formed by methane and water molecules under high pressure and low temperature. Naturally, methane hydrates are widely distributed in hydrate-stable zones at the edge of the continental shelf and in permafrost zones on land.

[0003] In methane hydrate mining research, a key prerequisite for conducting laboratory studies is the availability of representative in-situ methane hydrate samples. However, preserving undisturbed rock samples from natural methane hydrate reservoirs is difficult and expensive to transport. Therefore, laboratory-prepared sediment samples with representative hydrate occurrence patterns are crucial for conducting laboratory studies.

[0004] Currently, there are four main methods for preparing methane hydrate samples in the laboratory: gas enrichment, dissolved air and water circulation, mixing, and ice seeding. The gas enrichment and ice seeding methods are the most popular. The ice seeding method involves freezing deionized water into ice, crushing it into powder, and thoroughly mixing the ice powder with soil. High-pressure methane gas is then injected, and the temperature is slowly raised to gradually melt the ice particles. The melted water and methane gas then form hydrates. This method offers a rapid synthesis rate, high conversion rate, and uniform hydrate distribution, closely resembling the naturally occurring filling and holding forms of methane hydrate.

[0005] However, the particle structure of ice seed crushed ice is relatively large. On the one hand, the heating rate of the sample environment will greatly affect the conversion efficiency of ice to hydrate. The larger ice particles will cause hydrates to form on the surface of the ice particles, thereby hindering the internal ice from continuing to synthesize hydrates. On the other hand, the larger ice particles will affect the internal structure of the soil sample, resulting in a higher porosity in the sample, which deviates from the actual situation.

[0006] Therefore, there is an urgent need to provide an integrated screening and stirring device and preparation method for preparing methane hydrate soil samples. Summary of the Invention

[0007] The purpose of the present invention is to provide an integrated screening and stirring device and a preparation method for preparing methane hydrate soil samples, so as to solve the above problems.

[0008] To achieve the above object, the present invention provides the following solutions:

[0009] The integrated screening and stirring device for preparing methane hydrate soil samples comprises:

[0010] A frost preparation system, used for preparing frost;

[0011] a conveying system, a feed end of which is in communication with a frost outlet of the frost preparation system, the conveying system being used to convey the supported frost particles;

[0012] a vibrating screening system, the feed end of which is in communication with the discharge end of the conveying system, the vibrating screening system being used to screen the frost particles;

[0013] A soil sample frost mixing system, the feed end of which is connected to the discharge end of the vibration screening system, wherein the vibration screening system transports the frost particles of a specified particle size into the soil sample frost mixing system, so that the soil sample frost mixing system mixes the frost particles of the specified particle size with the soil sample;

[0014] A control and automation system is electrically connected to the frost preparation system, the conveying system, the vibration screening system and the soil sample frost mixing system.

[0015] Optionally, the frost preparation system includes:

[0016] an atomizer electrically connected to the control and automation system;

[0017] A frost collecting tray 1, wherein the feed end is connected to the discharge end of the atomizer, and the discharge end of the frost collecting tray 1 is connected to the feed end of the conveying system;

[0018] The surface of the frost collection plate is subjected to hydrophilic treatment;

[0019] The frost collection tray 1 is tilted at 30 degrees, and the lower end of the frost collection tray 1 is connected to the feed end of the conveying system;

[0020] The windproof guide portion is covered on the outer sides of the atomizer and the frost collecting tray.

[0021] Optionally, the windproof guide portion includes a windproof cover, and the windproof cover is arranged on the outside of the atomizer and the frost collection tray;

[0022] The wind shield is transmission-connected to the movable end of the vibration motor.

[0023] Optionally, the delivery system includes:

[0024] A transmission crawler, wherein the feed end is connected to the discharge end of the frost collecting tray 1, and the discharge end of the transmission crawler is connected to the feed end of the vibrating screening system;

[0025] A driving part, connected to the transmission crawler belt;

[0026] The transmission crawler belt is made of low-temperature resistant material.

[0027] Optionally, the driving unit includes:

[0028] A plurality of crawler drive wheels are arranged side by side, wherein the transmission crawler belt is sleeved on the outer sides of the plurality of crawler drive wheels, and the transmission crawler belt is in driving connection with the crawler drive wheels;

[0029] Any of the crawler driving wheel shafts is connected to one end of a transmission shaft, and the other end of the transmission shaft is connected to the output shaft of a speed regulating motor;

[0030] The speed regulating motor is electrically connected to the control and automation system.

[0031] Optionally, the vibration screening system includes:

[0032] A screen is located below the discharging end of the transmission crawler;

[0033] a vibrating part, drivingly connected to the screen, and configured to vibrate the screen;

[0034] The feed end of the frost collecting tray 2 is located below the screen, the discharge end of the frost collecting tray 2 is connected to the feed end of the soil sample frost mixing system, and a weighing part is provided at the bottom of the frost collecting tray 2.

[0035] Optionally, the vibration unit includes:

[0036] a vibration motor, wherein a movable end of the vibration motor is fixedly connected to one end of the screen, and a fixed end of the vibration motor is fixedly connected to the stand;

[0037] The weighing unit comprises:

[0038] a weighing sensor, wherein the movable end of the weighing sensor is fixedly connected to the bottom of the second frost collection tray, and the fixed end of the weighing sensor is fixed to the stand;

[0039] The vibration motor and the weighing sensor are both electrically connected to the control and automation system.

[0040] Optionally, the second frost collecting tray is tilted, the upper end of the second frost collecting tray is located below the screen, and the lower end of the second frost collecting tray is connected to the feed end of the soil sample frost mixing system.

[0041] Optionally, the soil sample frost mixing system includes:

[0042] The stirrer has a feed end connected to the discharge end of the frost collecting tray 2, and the control and automation system is electrically connected to the stirrer.

[0043] The method for preparing a methane hydrate soil sample, using the above-mentioned integrated sieving and stirring device for preparing a methane hydrate soil sample, comprises the following steps:

[0044] Before preparation, move the device and soil sample to a -10 °C freezer for 10 h;

[0045] In a freezer environment, pure water is injected into the frost preparation system, and the frost preparation system switch is turned on in the operation interface of the control and automation system;

[0046] Setting a suitable conveying speed of the conveying system through the control and automation system, and turning on the conveying system;

[0047] Setting the vibration pause of the vibration screening system in the operation interface of the control and automation system, turning on the vibration screening system, recording the mass of frost collected by the vibration screening system when the vibration stops, and turning off the frost preparation system, the conveying system, and the vibration screening system after reaching the mass required for the preset experiment;

[0048] The stirring time of the soil sample frost mixing system is set in the operation interface of the control and automation system, the pre-weighed soil sample and the frost reaching a preset weight are poured into the soil sample frost mixing system, the soil sample frost mixing system switch is turned on in the operation interface of the control and automation system, and the methane hydrate soil sample is obtained after stirring for a specified time.

[0049] Compared with the prior art, the present invention has the following advantages and technical effects:

[0050] Compared to traditional techniques, this method uses frost seeds instead of ice seeds. Frost seeds have a more uniform and dense particle size than ice seeds, effectively filling the pores of soil particles and avoiding affecting the soil structure. The samples prepared using the frost seed method are highly uniform, significantly avoiding the problems of hydrate formation blockage caused by uneven water distribution and the problem of unsustainable hydrate formation caused by large ice particles. This allows for a wider controllable range of hydrate saturation. Furthermore, the device boasts a compact and continuous structure, simple and safe operation, significantly reducing the reliance on manual labor in methane hydrate soil sample preparation and addressing the many safety issues associated with manual operation in low-temperature environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive work.

[0052] Figure 1 It is a schematic diagram of the structure of the present invention;

[0053] Among them, 1. Wind shield; 2. Atomizer; 3. Frost collection tray 1; 4. Drive track; 5. Track drive wheel; 6. Drive shaft; 7. Screen; 8. Vibration motor; 9. Frost collection tray 2; 10. Agitator; 11. Control and automation system; 12. Weighing sensor. DETAILED DESCRIPTION

[0054] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only 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 making creative efforts are within the scope of protection of the present invention.

[0055] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0056] Reference Figure 1 The present invention discloses an integrated screening and stirring device for preparing methane hydrate soil samples, comprising:

[0057] A frost preparation system, used for preparing frost;

[0058] A conveying system, the feed end of which is connected to the frost outlet of the frost preparation system, and the conveying system is used to convey the supported frost particles;

[0059] A vibrating screening system, the feed end of which is connected to the discharge end of the conveying system, and the vibrating screening system is used to screen the frost particles;

[0060] The soil sample frost mixing system has a feed end connected to a discharge end of the vibration screening system. The vibration screening system transports frost particles of a specified particle size into the soil sample frost mixing system, so that the soil sample frost mixing system mixes the frost particles of the specified particle size with the soil sample.

[0061] The control and automation system 11 is electrically connected to the frost preparation system, the conveying system, the vibration screening system and the soil sample frost mixing system.

[0062] The present invention includes a frost preparation system, a conveying system, a vibrating screening system, a soil sample frost mixing system, and a control and automation system 11. During use, the device and soil sample are moved to a -10°C freezer for pre-cooling for 10 hours. In the freezer, pure water is injected into the frost preparation system, and the frost preparation system is turned on in the control and automation system 11 operation interface. A suitable conveying speed of the conveying system is set through the control and automation system 11, and the conveying system is turned on. A vibration pause is set in the control and automation system 11 operation interface, and the vibrating screening system is turned on. When the vibration stops, the mass of frost collected by the vibrating screening system is recorded. Once the mass reaches the preset experimental mass, the frost preparation system, conveying system, and vibrating screening system are turned off. A stirring time for the soil sample frost mixing system is set in the control and automation system 11 operation interface, and a pre-weighed soil sample and frost reaching a preset weight are poured into the soil sample frost mixing system. The soil sample frost mixing system is turned on in the control and automation system 11 operation interface, and a methane hydrate soil sample is prepared after stirring for a specified time.

[0063] Compared to traditional techniques, this method uses frost seeds instead of ice seeds. Frost seeds have a more uniform and dense particle size than ice seeds, effectively filling the pores of soil particles and avoiding affecting the soil structure. The samples prepared using the frost seed method are highly uniform, significantly avoiding the problems of hydrate formation blockage caused by uneven water distribution and the problem of unsustainable hydrate formation caused by large ice particles. This allows for a wider controllable range of hydrate saturation. Furthermore, the device boasts a compact and continuous structure, simple and safe operation, significantly reducing the reliance on manual labor in methane hydrate soil sample preparation and addressing the many safety issues associated with manual operation in low-temperature environments.

[0064] As an optional embodiment, the frost preparation system includes:

[0065] Atomizer 2, electrically connected to the control and automation system 11;

[0066] The frost collecting tray 1 3, the feeding end of which is connected to the discharging end of the atomizer 2, and the discharging end of the frost collecting tray 1 3 is connected to the feeding end of the conveying system;

[0067] The surface of the frost collection plate 3 is hydrophilic treated;

[0068] The frost collecting tray 3 is tilted at 30 degrees, and the lower end of the frost collecting tray 3 is connected to the feed end of the conveying system;

[0069] The windproof guide portion is covered on the outside of the atomizer 2 and the frost collection tray 3.

[0070] As an optional embodiment, the windproof guide portion includes a windproof cover 1, which is arranged on the outside of the atomizer 2 and the frost collection tray 3;

[0071] The windshield 1 is transmission-connected to the movable end of the vibration motor.

[0072] The frost preparation system includes a windshield 1, an atomizer 2, and a frost collection plate 3 with a hydrophilic surface treatment; the atomizer 2 and the frost collection plate 3 are both located inside the windshield 1.

[0073] The wind shield 1 is connected to the movable end of the vibration motor. When the spray condenses into frost on the surface of the wind shield 1, the vibration motor can drive the wind shield 1 to vibrate so that the frost falls onto the frost collection plate 3.

[0074] The atomizer 2 atomizes pure water into 10-50μm droplets. The frost collection plate 3 is placed below the atomization port and tilted 30°. The surface of the frost collection plate 3 is hydrophilic treated. The windshield 1 is placed above the atomizer 2 and the frost collection plate 3 to form a semi-enclosed environment.

[0075] As an optional embodiment, the delivery system includes:

[0076] The feeding end of the transmission crawler 4 is connected to the discharging end of the frost collecting tray 3, and the discharging end of the transmission crawler 4 is connected to the feeding end of the vibration screening system;

[0077] A driving part, connected to the transmission track 4;

[0078] The transmission track 4 is made of low temperature resistant material.

[0079] As an optional embodiment, the driving unit includes:

[0080] A plurality of crawler drive wheels 5 are arranged side by side, and a transmission crawler 4 is sleeved on the outer sides of the plurality of crawler drive wheels 5, and the transmission crawler 4 is in transmission connection with the crawler drive wheels 5;

[0081] Any crawler driving wheel 5 is connected to one end of a transmission shaft 6, and the other end of the transmission shaft 6 is connected to the output shaft of the speed regulating motor;

[0082] The speed regulating motor is electrically connected to the control and automation system 11 .

[0083] The conveying system includes a transmission shaft 6, a crawler drive wheel 5, and a transmission crawler 4; the conveying system is located directly below the frost collection plate 3. After the transmission motor is started, it drives the transmission shaft 6 to rotate, and the transmission shaft 6 drives the crawler drive wheel 5 and the transmission crawler 4 to rotate.

[0084] The crawler driving wheel 5 and the transmission crawler belt 4 are meshedly connected, or the crawler driving wheel 5 and the transmission crawler belt 4 are frictionally connected.

[0085] The transmission crawler belt 4 is made of a low-temperature resistant material and forms a ring-shaped closed loop with the transmission shaft 6 and the crawler belt driving wheel 5 .

[0086] As an optional embodiment, the vibrating screening system includes:

[0087] The screen 7 is located below the discharge end of the transmission crawler 4;

[0088] a vibration part, which is in transmission connection with the screen 7 and is used to vibrate the screen 7;

[0089] The frost collecting tray 2 9 has a feed end located below the screen 7 , a discharge end of the frost collecting tray 2 9 is connected to the feed end of the soil sample frost mixing system, and a weighing portion is provided at the bottom of the frost collecting tray 2 9 .

[0090] As an optional embodiment, the vibration unit includes:

[0091] A vibration motor 8, wherein the movable end of the vibration motor 8 is fixedly connected to one end of the screen 7, and the fixed end of the vibration motor 8 is fixedly connected to the stand;

[0092] The weighing unit includes:

[0093] A weighing sensor 12, wherein the movable end of the weighing sensor 12 is fixedly connected to the bottom of the frost collecting tray 2 9, and the fixed end of the weighing sensor 12 is fixed to the stand;

[0094] The vibration motor 8 and the weighing sensor 12 are both electrically connected to the control and automation system 11 .

[0095] As an optional embodiment, the frost collecting tray 2 9 is tilted, the high end of the frost collecting tray 2 9 is located below the screen 7, and the low end of the frost collecting tray 2 9 is connected to the feed end of the soil sample frost mixing system.

[0096] The vibration screening system includes a screen 7, a frost collection tray 2 9, a vibration motor 8, and a weighing sensor 12; the vibration screening system is located below the conveying system, and the weighing sensor 12 is located below the frost collection tray 2 9.

[0097] Furthermore, the mesh 7 has an aperture of 2 mm and is made of stainless steel and is detachable.

[0098] As an optional embodiment, the soil-sample frost mixing system includes:

[0099] The stirrer 10 has a feeding end connected to a discharging end of the frost collecting tray 2 9 , and the control and automation system 11 is electrically connected to the stirrer 10 .

[0100] The soil sample frost mixing system includes a stirrer 10; the feed port of the stirrer 10 is located below the frost collecting tray 2 9; the control and automation system 11 is connected to control the frost preparation system, the conveying system, the vibration screening system, and the soil sample-frost mixing system.

[0101] The control and automation system 11 is preferably a PLC programmable controller.

[0102] The method for preparing a methane hydrate soil sample, using the above-mentioned integrated sieving and stirring device for preparing a methane hydrate soil sample, comprises the following steps:

[0103] Before preparation, move the device and soil sample to a -10 °C freezer for 10 h;

[0104] In a freezer environment, pure water is injected into the frost preparation system, and the frost preparation system switch is turned on in the operation interface of the control and automation system 11;

[0105] Setting a suitable conveying speed of the conveying system through the control and automation system 11 and turning on the switch of the conveying system;

[0106] Set the vibration pause of the vibration screening system in the operation interface of the control and automation system 11, turn on the vibration screening system switch, record the mass of frost collected by the vibration screening system when the vibration stops, and turn off the frost preparation system, conveying system and vibration screening system after reaching the preset experimental mass;

[0107] The stirring time of the soil sample frost mixing system is set in the operation interface of the control and automation system 11, the pre-weighed soil sample and the frost reaching the preset weight are poured into the soil sample frost mixing system, the soil sample frost mixing system switch is turned on in the operation interface of the control and automation system 11, and the methane hydrate soil sample is obtained after stirring for the specified time.

[0108] When operating, please refer to the following steps for details;

[0109] Step 1: Before the experiment begins, the device and soil samples need to be placed in a -10℃ freezer for 10 hours.

[0110] Step 2: Pour pure water into the atomizer 2 and turn on the atomizer switch in the operation interface of the control and automation system 11.

[0111] Step 3: Set the appropriate transmission speed of the transmission crawler 4 in the operation interface of the control and automation system 11 and turn on the conveying system switch.

[0112] Step 4: Set the vibration interval in the operation interface of the control and automation system 11, turn on the vibration system switch, record the frost mass of the frost collection tray 2 9 when the vibration stops, and turn off the frost preparation system, conveying system, and vibration screening system after reaching the preset experimental mass.

[0113] Step 5: Set the appropriate stirring time for the stirrer 10 on the control and automation system 11 interface. Pour the pre-weighed soil sample and the frost from the frost collection tray 2 9 into the stirrer 10. Turn on the stirrer 10 on the PCL controller interface. Once the stirrer 10 stops, remove the soil sample for sample preparation.

[0114] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0115] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.

Claims

1. An integrated sieving and stirring device for preparing methane hydrate soil samples, characterized in that: include: A frost preparation system, used for preparing frost; a conveying system, a feed end of which is in communication with a frost outlet of the frost preparation system, the conveying system being used to convey the supported frost particles; a vibrating screening system, the feed end of which is in communication with the discharge end of the conveying system, the vibrating screening system being used to screen the frost particles; A soil sample frost mixing system, the feed end of which is connected to the discharge end of the vibration screening system, wherein the vibration screening system transports the frost particles of a specified particle size into the soil sample frost mixing system, so that the soil sample frost mixing system mixes the frost particles of the specified particle size with the soil sample; A control and automation system (11) is electrically connected to the frost preparation system, the conveying system, the vibration screening system and the soil sample frost mixing system.

2. The integrated sieving and stirring device for preparing methane hydrate soil samples according to claim 1, characterized in that: The frost preparation system comprises: an atomizer (2) electrically connected to the control and automation system (11); A frost collecting tray (3) having a feed end connected to a discharge end of the atomizer (2), and a discharge end of the frost collecting tray (3) connected to a feed end of the conveying system; The surface of the frost collecting plate (3) is subjected to hydrophilic treatment; The frost collecting tray (3) is tilted at 30 degrees, and the lower end of the frost collecting tray (3) is connected to the feed end of the conveying system; The windproof guide portion is covered on the outside of the atomizer (2) and the frost collecting plate (3).

3. The integrated sieving and stirring device for preparing methane hydrate soil samples according to claim 2, characterized in that: The windproof guide portion comprises a windproof cover (1), and the windproof cover (1) is arranged on the outside of the atomizer (2) and the frost collection plate (3); The wind shield (1) is transmission-connected to the movable end of the vibration motor.

4. The integrated sieving and stirring device for preparing methane hydrate soil samples according to claim 3, characterized in that: The delivery system comprises: A transmission crawler (4), the feed end of which is in communication with the discharge end of the frost collecting tray (3), and the discharge end of the transmission crawler (4) is in communication with the feed end of the vibration screening system; A driving part, connected to the transmission crawler (4); The transmission crawler belt (4) is made of low-temperature resistant material.

5. The integrated sieving and stirring device for preparing methane hydrate soil samples according to claim 4, characterized in that: The driving unit includes: A plurality of crawler drive wheels (5) are arranged side by side, the transmission crawler belt (4) is sleeved on the outer sides of the plurality of crawler drive wheels (5), and the transmission crawler belt (4) and the crawler drive wheels (5) are in transmission connection; Any of the crawler driving wheels (5) is axially connected to one end of a transmission shaft (6), and the other end of the transmission shaft (6) is axially connected to the output shaft of a speed regulating motor; The speed regulating motor is electrically connected to the control and automation system (11).

6. The integrated sieving and stirring device for preparing methane hydrate soil samples according to claim 4, characterized in that: The vibrating screening system comprises: A screen (7) is located below the discharge end of the transmission crawler (4); a vibrating portion, in transmission connection with the screen (7), the vibrating portion being used to vibrate the screen (7); The second frost collecting tray (9) has a feed end located below the screen (7), a discharge end of the second frost collecting tray (9) is connected to the feed end of the soil sample frost mixing system, and a weighing portion is provided at the bottom of the second frost collecting tray (9).

7. The integrated sieving and stirring device for preparing methane hydrate soil samples according to claim 6, characterized in that: The vibration part includes: a vibration motor (8), wherein the movable end of the vibration motor (8) is fixedly connected to one end of the screen (7), and the fixed end of the vibration motor (8) is fixedly connected to the stand; The weighing unit comprises: A weighing sensor (12), wherein the movable end of the weighing sensor (12) is fixedly connected to the bottom of the second frost collecting plate (9), and the fixed end of the weighing sensor (12) is fixed to the stand; The vibration motor (8) and the weighing sensor (12) are both electrically connected to the control and automation system (11).

8. The integrated sieving and stirring device for preparing methane hydrate soil samples according to claim 6, characterized in that: The second frost collecting tray (9) is tilted, the upper end of the second frost collecting tray (9) is located below the screen (7), and the lower end of the second frost collecting tray (9) is connected to the feed end of the soil sample frost mixing system.

9. The integrated sieving and stirring device for preparing methane hydrate soil samples according to claim 6, characterized in that: The soil-sample frost mixing system comprises: The stirrer (10) has a feed end connected to the discharge end of the second frost collecting tray (9), and the control and automation system (11) is electrically connected to the stirrer (10).

10. A method for preparing a methane hydrate soil sample, using the integrated sieving and stirring device for preparing a methane hydrate soil sample according to any one of claims 1 to 9, characterized in that: The steps include: Before preparation, move the device and soil sample to a -10 °C freezer for 10 h; In a freezer environment, pure water is injected into the frost preparation system, and the frost preparation system switch is turned on in the operation interface of the control and automation system (11); Setting a suitable conveying speed of the conveying system through the control and automation system (11) and turning on a switch of the conveying system; The vibration interval of the vibration screening system is set in the operation interface of the control and automation system (11), the vibration screening system switch is turned on, and the mass of frost collected by the vibration screening system is recorded when the vibration stops. After the mass required for the preset experiment is reached, the frost preparation system, the conveying system and the vibration screening system are turned off; The stirring time of the soil sample frost mixing system is set in the operation interface of the control and automation system (11), the pre-weighed soil sample and the frost reaching a preset weight are poured into the soil sample frost mixing system, the soil sample frost mixing system switch is turned on in the operation interface of the control and automation system (11), and the methane hydrate soil sample is obtained after stirring for a specified time.

Images