Sample preparation device and sample preparation method of hollow torsional shear apparatus corresponding to nano silica sol solidified sandy soil

Abstract

The invention discloses a sample preparation device and method for a hollow torsional shear apparatus corresponding to nano-silica sol solidified sandy soil, the sample preparation device comprises an inner pipe, an outer pipe, a sample sealing cover and a base, the sample preparation device is of a hollow cylindrical structure, the bottom of the inner pipe is integrally connected with the base, the top of the inner pipe is connected with the sample sealing cover in a nested mode, and the outer pipe is connected with the sample sealing cover. The bottom of the outer pipe is connected with the base in a nested mode. A rubber membrane sleeves the inner tube, one end of the rubber membrane sleeves the base and is fixed on the base through a rubber ring, and the other end of the rubber membrane is flanged and sleeves the top of the outer tube and is used for wrapping a sample during sample preparation; a suction nozzle is arranged in the middle of the outer tube and is used for sucking out air between the outer tube and the rubber membrane during sample preparation, so that the rubber membrane is attached to the inner surface of the outer tube. According to the device, the function that a liquid curing agent such as nano silica sol is separated from a hollow torsional shear apparatus to prepare a sample independently when sandy soil is cured is realized, the sample can be integrally formed and manufactured in a rubber membrane, and the practicability is high.

Description

Technical Field

[0001] The present application relates to the field of mechanical testing devices for building materials, and in particular to a sample preparation device and a sample preparation method for a hollow torsion shear apparatus corresponding to nano-silica sol-solidified sand. Background Art

[0002] Hollow cylindrical torsion shear apparatus is widely used in geotechnical engineering because of its functions of dynamic loading and simulation of complex stress paths. The test sample loading process mainly presses the soil into the sample loading container evenly, and the method adopted is generally the layered sample loading method. In geotechnical tests, sample preparation is one of the steps in the hollow cylindrical torsion shear test. Especially for the preparation of glue-added solidified samples, there will often be sample preparation problems when adding liquid curing agents such as nano-silica sol. If the operation is improper, the soil sample may be damaged. For glue-added soil, especially when adding liquid reinforcement agents such as nano-silica sol, it takes a certain amount of time to directly prepare the colloidal solution on the hollow cylindrical torsion shear apparatus for solidification. If the glue is directly added in the hollow torsion shear apparatus sample loading device, the colloid may penetrate into the screw holes, exhaust holes, and pressurized pipes during the solidification process, thereby causing problems such as blockage of the pores and pipes of the soil experiment instrument, reducing the utilization rate of the instrument, and more seriously even damaging the test instrument, resulting in waste and destruction of scientific research resources. Summary of the invention

[0003] Purpose: In order to overcome the shortcomings of the prior art, the present invention provides a sample preparation device and a sample preparation method for a hollow torsion shear apparatus corresponding to nano-silica sol-solidified sand, which can directly complete the sample preparation in a rubber membrane and is integrally formed.

[0004] Technical solution: To solve the above technical problems, the technical solution adopted by the present invention is: In the first aspect, the present application provides a sample preparation device for a hollow torsion shear apparatus for nano-silica sol-solidified sand, comprising an inner tube, an outer tube, a sample cover and a base, which is a hollow cylindrical structure. The bottom of the inner tube is integrally connected to the base, the top of the inner tube is nestedly connected to the sample cover, and the bottom of the outer tube is nestedly connected to the base; The inner tube is covered with a rubber film, one end of which is inserted into the base and fixed on the base through a rubber ring, and the other end is flanged and covered on the top of the outer tube, so as to wrap the sample during sample preparation; A suction nozzle is arranged in the middle of the outer tube, which is used to suck out the air between the outer tube and the rubber membrane when preparing the sample, so that the rubber membrane is attached to the inner surface of the outer tube.

[0005] After the rubber membrane is attached to the inner surface of the outer tube, it is used to install the rubber membrane directly together with the test soil sample during sample preparation, avoiding the problem of installing the rubber membrane later.

[0006] The inner tube is integrally connected to the base, the outer tube is nested with the base under the wrapping of the rubber film, and the sample cover is nested with the inner tube, which together make the interior of the entire device sealed.

[0007] In some embodiments, the base includes a cylindrical nesting portion, a slot, a support, a support, and a through-type circular hole. The cylindrical nesting portion is nested and connected with the bottom of the outer tube, and its size is smaller than the support platform; The bottom surface of the support is integrally connected to the support, and the top surface is integrally connected to the cylindrical nesting portion, and the size is larger than the outer tube, so as to support the nested outer tube and the sample and facilitate the nesting of the rubber tube; A slot is provided on the side of the support platform, the rubber membrane is inserted into the cylindrical nesting part and fixed on the support platform through a rubber ring, and the rubber ring falls into the slot on the cylindrical nesting part, and the slot is used to limit the position of the rubber ring; The supports are arranged in a plurality and arranged in a circular array at the bottom of the base, and are used to support the overall structure of the sample preparation device; One or more through circular holes are vertically provided on the base, the through circular holes penetrate the base from the vertical geometric center point, and are connected with rubber tubes for introducing liquid curing agent into the soil material during sample preparation.

[0008] Liquid curing agent is introduced into the device from below to ensure uniform penetration of the sample by the liquid curing agent.

[0009] In some embodiments, a hollow fine-mesh gauze is placed at the upper end of the cylindrical nesting portion to prevent sample preparation sand and soil from entering the through-type circular holes.

[0010] In some embodiments, the through-type circular hole further includes a first rounded corner at the bottom thereof, and the first rounded corner is used to facilitate nesting operation when connecting the rubber tube while ensuring the air tightness of the device.

[0011] In some embodiments, the bottom of the outer tube further includes a second rounded corner, and the second rounded corner is used for nesting and connecting the outer tube with the base.

[0012] In some embodiments, the inner tube and the outer tube are used to shape the prepared sample, the outer diameter of the inner tube is the same as the inner diameter of the sample, the inner diameter of the outer tube is the same as the outer diameter of the sample, and the space size formed after the inner tube, the outer tube, the sample cover and the base are connected and nested is the same as the required sample.

[0013] In some embodiments, the inner tube, outer tube, sample cover and base are all made of transparent hard materials.

[0014] In some embodiments, one end of the rubber tube extends into the through-type circular hole through the first rounded corner, and the other end is connected to the pump outlet of the peristaltic pump, and is used to add liquid curing agent to the sample under the action of the peristaltic pump during the sample preparation process.

[0015] In some embodiments, the liquid curing agent is nano-silica sol.

[0016] In a second aspect, the present application provides a method for preparing a sample of a nano-silica sol-solidified sand corresponding to a hollow torsion shear apparatus, using the sample preparing device of the nano-silica sol-solidified sand corresponding to a hollow torsion shear apparatus as described in the first aspect, the method comprising: S1. Place the hollow fine-pore gauze on the cylindrical nesting part, insert the paper-like rubber membrane into the cylindrical nesting part, tighten one end with a rubber ring and fix it in the slot, and nest the outer tube on the support platform; S2. Put the flanged part of the other end of the sample-preparing rubber film protruding from the outer tube onto the upper end of the outer tube, and suck out the air between the sample-preparing rubber film and the outer tube from the suction nozzle, so that the sample-preparing rubber film fits tightly against the inner wall of the outer tube; S3, connect the suction end of the peristaltic pump with the liquid curing agent with a rubber tube, and connect the pump outlet of the peristaltic pump with the through-hole with a rubber tube; S4. Add the test sand and soil into the sample preparation rubber membrane in layers until the upper surface of the sand and soil is flush with the upper end of the outer tube; S5. Turn on the power of the peristaltic pump to allow the liquid curing agent to penetrate the sample slowly and evenly from bottom to top. When the liquid curing agent penetrates to the top of the sample, keep the peristaltic pump working for ten seconds until a little overflow occurs at the top. S6. Turn off the external peristaltic pump, pull out the rubber tube of the peristaltic pump located at the through-hole, immediately seal the through-hole, nest the sample cover and connect it to the upper end of the inner tube, and keep the sample preparation device stationary before the liquid curing agent solidifies; S7. After curing, turn back the sample-preparing rubber membrane on the upper end of the outer tube, slowly take out the outer tube vertically, gently hold the middle of the sample-preparing rubber membrane, slowly twist the base as a whole, and then take out the base and the inner tube connected to it in one piece.

[0017] The method can realize the one-piece forming of the hollow torsion shear test specimen under the condition of liquid curing agent for sand reinforcement, avoids the influence of the liquid in the hollow torsion shear instrument on the curing agent, and can carry out the specimen curing process away from the hollow torsion shear instrument, thereby improving the sample preparation efficiency and stability.

[0018] Beneficial effects: Compared with the prior art, the sample preparation device for the hollow torsion shear apparatus for nano-silica sol-solidified sand provided by the present invention has the following advantages: (1) The function of separating the liquid curing agent such as nano-silica sol from the hollow torsion shear instrument for independent sample preparation during the curing of sand and soil is realized, thus avoiding instrument contamination caused by direct contact between the curing agent and the hollow torsion shear instrument; (2) The function of integrally molding the specimen directly in the rubber membrane required by the hollow torsion shear tester is realized. The manufactured specimen can be directly used in the test operation of the hollow torsion shear tester, which is highly practical. (3) The nano-silica sol was able to penetrate the sand sample from bottom to top, thus improving the saturation state and uniformity of the sample. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 A schematic diagram of the three-dimensional structure of a sample preparation device in an embodiment of the present invention;

[0021] Figure 2 A top view of a sample preparation device in an embodiment of the present invention;

[0022] Figure 3 A schematic diagram of the nested connections of the sample preparation device in an embodiment of the present invention;

[0023] Figure 4 Schematic diagram of a hollow fine mesh gauze in an embodiment of the present invention;

[0024] Figure 5 Schematic diagram of the connection of the sample preparation device in the embodiment of the present invention.

[0025] In the figure: 1 inner tube, 2 outer tube, 3 suction nozzle, 4 sample cover, 5 base, 6 cylindrical nesting part, 7 slot, 8 support, 9 support, 10 through-type circular hole, 11 first rounded corner, 12 second rounded corner, 13 peristaltic pump, 14 rubber tube, 15 liquid curing agent, 16 rubber film, 17 rubber ring, 18 hollow fine mesh. DETAILED DESCRIPTION

[0026] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use.

[0027] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to those of ordinary skill in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may also include different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so that once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0028] Embodiment 1:

[0029] This embodiment provides a sample preparation device for a hollow torsion shear apparatus for nano-silica sol-solidified sand, including: Figure 1 The inner tube 1, outer tube 2, sample cover 4 and base 5 shown are hollow cylindrical structures.

[0030] like Figure 1 As shown, the bottom of the inner tube 1 is integrally connected to the base 5, the top of the inner tube 1 is nestedly connected to the sample cover 4, and the bottom of the outer tube 2 is nestedly connected to the base 5; The inner tube 1 is provided with a rubber film 16 on the outside, one end of the rubber film 16 is inserted into the base 5 and fixed on the base 5 through a rubber ring 17, and the other end is flanged and sleeved on the top of the outer tube 2, which is used to wrap the sample during sample preparation; A suction nozzle 3 is provided in the middle of the outer tube 2 for sucking out the air between the outer tube 2 and the rubber membrane 16 during sample preparation, so that the rubber membrane 16 adheres to the inner surface of the outer tube 2 .

[0031] In some embodiments, Figures 1 to 3 As shown, the base 5 includes a cylindrical nesting portion 6, a slot 7, a support 8, a support 9 and a through-type circular hole 10. The cylindrical nesting portion 6 is nested and connected with the bottom of the outer tube 2, and its size is smaller than the support 8; The bottom surface of the support 8 is integrally connected to the support 9, and the top surface is integrally connected to the cylindrical nesting portion 6, and the size is larger than the outer tube 2, and is used to support the nested outer tube 2 and the sample; A slot 7 is provided on the side of the support platform 8, and the rubber membrane 16 is inserted into the cylindrical nesting portion 6 and fixed on the support platform 8 through a rubber ring 17. The slot 7 is used to limit the position of the rubber ring 17; The support 9 is provided in a plurality and arranged in a circular array at the bottom of the base 5, and is used to support the overall structure of the sample preparation device; The base 5 is vertically provided with one or more through-holes 10 , which penetrate the base 5 from the vertical geometric center point and are connected with a rubber tube 14 for introducing a liquid curing agent 15 into the soil material during sample preparation.

[0032] In some embodiments, the upper end of the cylindrical nesting portion 6 is provided with a Figure 4 The hollow fine-pore gauze 18 shown is used to prevent sample preparation sand from entering the through-type circular hole 10.

[0033] In this embodiment, the hollow fine-pore gauze 18 is a hollow fine-pore nylon gauze.

[0034] In some embodiments, the through-type circular hole 10 further includes a first rounded corner 11 at the bottom thereof, and the first rounded corner 11 is used to ensure the air tightness of the device when the rubber tube 14 is connected.

[0035] In some embodiments, the bottom of the outer tube 2 further includes a second rounded corner 12 , and the second rounded corner 12 is used to nest the outer tube 2 and the base 5 .

[0036] In some embodiments, the inner tube 1 and the outer tube 2 are used to shape the prepared sample, the outer diameter of the inner tube 1 is the same as the inner diameter of the sample, the inner diameter of the outer tube 2 is the same as the outer diameter of the sample, and the space size formed after the inner tube 1, the outer tube 2, the sample cover 4 and the base 5 are connected and nested is the same as the required sample.

[0037] In some embodiments, the inner tube 1, the outer tube 2, the sample cover 4 and the base 5 are all made of transparent hard materials.

[0038] like Figure 5 As shown, in some embodiments, one end of the rubber tube 14 extends into the through-type circular hole 10 through the first fillet 11, and the other end is connected to the pump outlet of the peristaltic pump 13, and is used to add liquid curing agent 15 to the sample under the action of the peristaltic pump 13 during the sample preparation process.

[0039] In this embodiment, the liquid curing agent 15 is nano-silica sol.

[0040] Embodiment 2:

[0041] This embodiment provides a method for preparing a sample of a nano-silica sol-solidified sandy soil corresponding to a hollow torsion shear instrument, using the sample preparing device of the nano-silica sol-solidified sandy soil corresponding to a hollow torsion shear instrument as described in the first embodiment, the method comprising: S1, place the hollow fine mesh 18 on the cylindrical nesting part 6, insert the paper-like rubber membrane 16 into the cylindrical nesting part 6, tighten one end with a rubber ring 17 and fix it in the slot 7, and nest the outer tube 2 on the support 8; S2, the part of the sample-preparing rubber film 16 protruding from the outer tube 2 is flanged and put on the upper end of the outer tube 2, and the air between the sample-preparing rubber film 16 and the outer tube 2 is sucked out from the suction nozzle 3, so that the sample-preparing rubber film 16 is tightly attached to the inner wall of the outer tube 2; S3, connecting the suction end of the peristaltic pump 13 and the liquid curing agent 15 with a rubber tube 14, and connecting the pump outlet end of the peristaltic pump 13 and the through-type circular hole 10 with a rubber tube 14; S4, adding the test sand into the sample preparation rubber membrane 16 in layers until the upper surface of the sand is flush with the upper end of the outer tube 2; S5, turn on the power of the peristaltic pump 13, so that the liquid curing agent 15 slowly and evenly penetrates the sample from bottom to top. When the liquid curing agent 15 penetrates to the top of the sample, keep the peristaltic pump 13 working for ten seconds until the top slightly overflows; S6, turn off the peristaltic pump 13, pull out the rubber tube 14 located at the through-hole 10, immediately close the through-hole 10, nest the sample cover 4 and connect it to the upper end of the inner tube 1, and keep the sample preparation device stationary before the liquid curing agent 15 is cured; S7. After curing, turn back the sample-preparing rubber film 16 on the upper end of the outer tube 2, slowly take out the outer tube 2 vertically, gently hold the middle of the sample-preparing rubber film 16, slowly screw the base 5 as a whole, and then take out the base 5 and the inner tube 1 integrally connected thereto.

[0042] The nano curing agent used in this embodiment is nano silica sol.

[0043] In the description of the present disclosure / application, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only used to explain the relative positional relationship, movement, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly. It is only for the convenience of describing the present disclosure / application and simplifying the description, and does not indicate or imply 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 to the present disclosure / application.

[0044] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the feature. In the description of this disclosure / application, unless otherwise specified, "plurality" means two or more.

[0045] In the description of this disclosure / application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this disclosure / application can be understood according to specific circumstances.

[0046] The above is only a preferred implementation of the present disclosure / application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present disclosure / application, and these improvements and modifications should also be regarded as the scope of protection of the present disclosure / application.

Claims

1. A sample preparation device for a hollow torsion shear apparatus for nano-silica sol-solified sand, characterized in that: The device comprises an inner tube (1), an outer tube (2), a sample cover (4) and a base (5), and is a hollow cylindrical structure. The bottom of the inner tube (1) is integrally connected to the base (5), the top of the inner tube (1) is nestedly connected to the sample cover (4), and the bottom of the outer tube (2) is nestedly connected to the base (5); The inner tube (1) is provided with a rubber membrane (16) on the outside, one end of the rubber membrane (16) is inserted into the base (5) and fixed to the base (5) via a rubber ring (17), and the other end is flanged and sleeved on the top of the outer tube (2) for wrapping the sample during sample preparation; A suction nozzle (3) is provided in the middle of the outer tube (2) for sucking out the air between the outer tube (2) and the rubber membrane (16) during sample preparation, so that the rubber membrane (16) adheres to the inner surface of the outer tube (2).

2. The sample preparation device for the hollow torsion shear apparatus for nano-silica sol-solidified sand according to claim 1 is characterized in that: The base (5) comprises a cylindrical nesting portion (6), a slot (7), a support (8), a support (9) and a through-type circular hole (10). The cylindrical nesting portion (6) is nested and connected with the bottom of the outer tube (2), and has a size smaller than the support platform (8); The bottom surface of the support (8) is integrally connected to the support (9), and the top surface is integrally connected to the cylindrical nesting portion (6). The support (8) is larger in size than the outer tube (2) and is used to support the nested outer tube (2) and the sample. A slot (7) is provided on the side of the support platform (8); the rubber membrane (16) is inserted into the cylindrical nesting portion (6) and fixed on the support platform (8) via a rubber ring (17); the slot (7) is used to limit the position of the rubber ring (17); The supports (9) are arranged in a plurality and arranged in a circular array at the bottom of the base (5), and are used to support the overall structure of the sample preparation device; The base (5) is vertically provided with one or more through-type circular holes (10), the through-type circular holes (10) passing through the base (5) from a vertical geometric center point and connected to a rubber tube (14) for introducing a liquid curing agent (15) into the soil material during sample preparation.

3. The sample preparation device for the hollow torsion shear apparatus for nano-silica sol-solidified sand according to claim 2, characterized in that: A hollow fine-pore gauze (18) is placed at the upper end of the cylindrical nesting portion (6) to prevent sample preparation sand from entering the through-type circular hole (10).

4. The sample preparation device for the hollow torsion shear apparatus for nano-silica sol-solidified sand according to claim 2, characterized in that: The through-type circular hole (10) further comprises a first rounded corner (11) at the bottom thereof, and the first rounded corner (11) is used to ensure the airtightness of the device when connecting the rubber tube (14).

5. The sample preparation device for the hollow torsion shear apparatus for nano-silica sol-solidified sand according to claim 2, characterized in that: The bottom of the outer tube (2) further comprises a second rounded corner (12), and the second rounded corner (12) is used for nesting and connecting the outer tube (2) and the base (5).

6. The sample preparation device for the hollow torsion shear apparatus for nano-silica sol-solidified sand according to claim 1 or 2, characterized in that: The inner tube (1) and the outer tube (2) are used to shape the prepared sample; the outer diameter of the inner tube (1) is the same as the inner diameter of the sample, and the inner diameter of the outer tube (2) is the same as the outer diameter of the sample.

7. The sample preparation device for the hollow torsion shear apparatus for nano-silica sol-solidified sand according to claim 1 or 2, characterized in that: The inner tube (1), the outer tube (2), the sample cover (4) and the base (5) are all made of transparent hard materials.

8. The sample preparation device for the hollow torsion shear apparatus for nano-silica sol-solidified sand according to claim 4, characterized in that: One end of the rubber tube (14) extends into the through-type circular hole (10) via the first fillet (11), and the other end is connected to the pump outlet of the peristaltic pump (13), and is used to add a liquid curing agent (15) to the sample under the action of the peristaltic pump (13) during the sample preparation process.

9. The sample preparation device for the hollow torsion shear apparatus for nano-silica sol-solidified sand according to claim 8, characterized in that: The liquid curing agent (15) is nano silica sol.

10. A method for preparing samples of nano-silica sol-sol-solified sand corresponding to a hollow torsion shear apparatus, characterized in that: Using the sample preparation device for the hollow torsion shear apparatus corresponding to the nano-silica sol-solidified sand as described in claims 1-9, the method comprises: S1. Place the hollow fine mesh 18 on the cylindrical nesting part (6), insert the paper-like rubber membrane (16) into the cylindrical nesting part (6), tighten one end with a rubber ring (17) and fix it in the slot (7), and nest the outer tube (2) on the support (8); S2, the portion of the other end of the sample-preparing rubber film (16) protruding from the outer tube (2) is flanged and placed on the upper end of the outer tube (2), and the air between the sample-preparing rubber film (16) and the outer tube (2) is sucked out from the suction nozzle 3, so that the sample-preparing rubber film (16) is tightly attached to the inner wall of the outer tube (2); S3, connecting the suction end of the peristaltic pump (13) and the liquid curing agent (15) with a rubber tube (14), and connecting the pump outlet end of the peristaltic pump (13) and the through-hole (10) with a rubber tube (14); S4, adding the test sand and soil into the sample preparation rubber membrane (16) in layers until the upper surface of the sand and soil is flush with the upper end of the outer tube (2); S5. Turn on the power of the peristaltic pump (13) to allow the liquid curing agent (15) to penetrate the sample from bottom to top at a slow and uniform speed. When the liquid curing agent (15) penetrates to the top of the sample, keep the peristaltic pump (13) working for ten seconds until a little overflow occurs at the top. S6, turn off the external peristaltic pump (13), pull out the peristaltic pump rubber tube (14) located at the through-hole (10), immediately seal the through-hole (10), nest the sample cover (4) and connect it to the upper end of the inner tube (1), and keep the sample preparation device stationary before the liquid curing agent (15) is cured; S7. After solidification, turn back the sample-preparing rubber membrane (16) on the upper end of the outer tube (2), slowly remove the outer tube (2) vertically, gently hold the middle of the sample-preparing rubber membrane (16), slowly twist the base (5) as a whole, and then remove the base (5) and the inner tube (1) connected thereto in an integral manner.

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