Triaxial experimental device, test system and method based on in-situ X-ray analysis

Abstract

The present invention relates to the technical field of testing equipment for geological samples, and provides a triaxial experimental device based on in-situ X-ray analysis, a testing system and a method thereof. The triaxial experimental device based on in-situ X-ray analysis comprises a container body and a mounting base, wherein the container body comprises an upper cover, an outer shell and a triaxial pressure assembly, wherein the triaxial pressure assembly is arranged in the outer shell, a mounting position is arranged on the top of the triaxial pressure assembly, a first fluid filling device and a second fluid filling device of the testing system are respectively connected to the triaxial pressure assembly; a slit is arranged on the upper cover; a scanning device is arranged above the container body, and the scanning device comprises an emission source and a detector; the container body is arranged on the mounting base; the present invention uses the triaxial experimental device in conjunction with an X-ray diffractometer of the scanning device to onlinely measure the physical and chemical processes of the geological sample under the triaxial experimental conditions of the triaxial experimental device, namely, the crystal structure changes, in real time, to meet the research needs of the geological sample.

Description

Technical Field

[0001] The present invention relates to the technical field of geological sample testing equipment, and in particular to a triaxial experimental device, a testing system and a method thereof based on in-situ X-ray analysis. Background Art

[0002] At present, triaxial experimental devices in related technologies, such as high-temperature and high-pressure triaxial presses, are mainly used to apply pressure to samples, such as geological samples, in three coordinate directions in space to conduct triaxial experiments in order to determine the mechanical data of the samples. However, in the above-mentioned triaxial experiments, the samples are placed inside the triaxial experimental device, so it is impossible to collect the physical and chemical processes (crystal structure changes) that may occur in real time.

[0003] The high-temperature and high-pressure X-ray diffractometer (XRD) of the related technology mainly uses X-ray diffraction technology to realize in-situ measurement of the crystal structure changes of samples, such as geological samples, under high-temperature and high-pressure conditions; wherein, the high-temperature and high-pressure X-ray diffractometer (hereinafter referred to as X-ray diffractometer) mainly includes an emission source (X-ray light tube), a goniometer, a detector and a sample stage, and the sample is placed on the sample stage, but the related X-ray diffractometer can only realize the crystal structure changes of samples collected under high temperature or static high-pressure conditions, and cannot measure the crystal structure changes of samples under the above-mentioned three-axis experimental conditions in real time. Summary of the invention

[0004] The problem solved by the present invention is how to collect the crystal structure changes of geological samples under triaxial experimental conditions in real time by using a triaxial experimental device in conjunction with a scanning device.

[0005] To solve the above problems, in a first aspect, the present invention provides a triaxial experimental device based on in-situ X-ray analysis, which is applied to a test system and comprises:

[0006] A container body, the container body comprising an upper cover, an outer shell and a triaxial pressure assembly, the triaxial pressure assembly is arranged in the outer shell, the top of the triaxial pressure assembly is provided with a mounting position for placing a sample, the first fluid filling device and the second fluid filling device of the test system are respectively connected to the triaxial pressure assembly to cooperate with the triaxial pressure assembly to perform a triaxial pressure test on the sample; the upper cover is detachably connected to the top of the outer shell, and the upper cover is provided with a slit; a scanning device for scanning and recording X-ray diffraction data of the sample under triaxial pressure conditions is arranged above the container body, the scanning device comprises an emission source for emitting X-rays to scan the sample and a detector for receiving the X-rays diffracted by the sample, and the slit is used to allow the X-rays emitted by the emission source to enter the container body and the X-rays diffracted by the sample to be emitted from the container body to the detector;

[0007] A mounting base is provided on which the container body is arranged.

[0008] Optionally, the three-axis pressure assembly includes an axial pressure rod assembly and a sleeve, wherein the axial pressure rod assembly is arranged in the outer shell along the axial direction of the outer shell, and the sleeve is sleeved on the top end of the axial pressure rod assembly and outside the sample, and the sample is located below the slit of the upper cover.

[0009] Optionally, the three-axis pressure assembly also includes a first pressure head, a first support ring, a second support ring and a positioning piece. The outer shell is provided with a first cavity and a second cavity which are arranged along its own axial direction and are interconnected. The first pressure head is embedded in the second cavity. The top end of the axial pressure rod assembly is passed through the first pressure head and is in the first cavity. The positioning piece is arranged between the top end of the axial pressure rod assembly and the outside of the sleeve and the inner wall of the outer shell. The first support ring and the second support ring are arranged in the first cavity and are respectively on the upper and lower sides of the positioning piece. The first pressure head is provided with a first fluid flow channel connected to the first cavity. The positioning piece is a circular ring structure made of porous rubber. The first fluid filling device is connected to the first fluid flow channel, and is used to output the confining pressure fluid to flow through the first fluid flow channel, the first cavity and the positioning piece in sequence and act on the sleeve sleeved outside the sample.

[0010] Optionally, the three-axis pressure assembly also includes a limiting top plate, a third cavity is provided inside the first pressure head, an annular protrusion is provided on the outer wall of the axial pressure rod assembly, the annular protrusion is sealed to the circumferential side wall of the third cavity, and a fluid entry space is preset between the annular protrusion and the inner bottom wall of the third cavity, the first pressure head is also provided with a second fluid flow channel connected to the fluid entry space, the limiting top plate is arranged between the sample and the upper cover, the first fluid filling device is connected to the second fluid flow channel, and is used to output axial pressure fluid to flow through the second fluid flow channel and the fluid entry space in sequence, so as to push the annular protrusion to drive the axial pressure rod assembly to move axially.

[0011] Optionally, the three-axis pressure assembly also includes a second pressure head, and a fourth cavity is provided inside the first pressure head, the fourth cavity is located above the third cavity, and the second pressure head is arranged in the fourth cavity, and the second pressure head is used to limit the axial displacement height of the annular protrusion.

[0012] Optionally, the triaxial pressure assembly further comprises a seepage metal ring, a transfer pipeline and a transmission top plate, wherein the transmission top plate is arranged between the sample and the limiting top plate, the first support ring is provided with a sink and a gap flow channel, the seepage metal ring is arranged in the sink, and the seepage metal ring is sleeved outside the top of the sample; the interior of the axial pressure rod assembly is provided with a fluid inlet flow channel and a fluid outlet flow channel, and the axial pressure rod assembly is also provided with a reflux port at the first cavity, and the second fluid filling device is respectively connected to the fluid inlet flow channel and the fluid outlet flow channel. The porous fluid in the fluid inlet channel is used for inputting the porous fluid into the fluid inlet channel and receiving the porous fluid discharged from the fluid outlet channel. The transparent top plate is arranged above the first support ring and the seepage metal ring and is in contact with and connected to the first support ring and the seepage metal ring. The first support ring is connected to the reflux port through the transfer pipeline. The porous fluid in the fluid inlet channel flows back to the fluid outlet channel after passing through the sample, the seepage metal ring, the gap channel of the first support ring, the transfer pipeline and the reflux port in sequence.

[0013] Optionally, the triaxial experimental device based on in-situ X-ray analysis further includes a support seat, the sample is arranged above the support seat, and the support seat is arranged at the top end of the axial pressure rod assembly for mounting samples of different sizes.

[0014] Compared with the prior art, the present invention has a detachable connection between the upper cover and the top of the outer shell, and a mounting position for placing the sample is provided on the top of the three-axis pressure assembly, so that when the upper cover is opened, the sample can be placed at the mounting position of the three-axis pressure assembly provided in the outer shell; and the container body is provided on the mounting base, so that the container body can be moved to one side of the scanning device, such as below, through the mounting base, wherein the height of the mounting base can be adjusted to adjust the height of the container body provided in the mounting base, so that the height of the mounting position of the container body matches the height of the original standard sample stage in the scanning device, such as an X-ray diffractometer, so that the container body can replace the original sample stage in the X-ray diffractometer, so that the three-axis experimental device and the scanning device, such as an X-ray diffractometer, can be used online.

[0015] The first fluid filling device of the test system is connected to the triaxial pressure assembly, so that the confining pressure fluid and the axial pressure fluid can be input into different flow channels in the triaxial pressure assembly through the first fluid filling device and act on the sample, so as to perform confining pressure test and axial pressure test on the sample; the second fluid filling device is connected to the triaxial pressure assembly, so that the pore fluid can be input into the triaxial pressure assembly to perform pore pressure test on the sample, thereby realizing the triaxial experimental operation on the sample and obtaining the corresponding mechanical data of the geological sample; by arranging a slit in the upper cover, and the scanning device includes an emission source and a detector, when the XRD test is performed on the sample through the scanning device , so that the length direction of the slit is parallel to or corresponds to the plane where the emission source that emits X-rays and the detector that receives X-rays are located, or the length direction of the slit is consistent with the arrangement direction of the emission source and the detector, so that it is convenient for the X-rays emitted by the emission source of the scanning device to pass through the slit and can irradiate the sample in the scanning container body, and the X-rays can pass through the slit and enter the detector after diffracting by the sample, so that the scanning device can measure the physical and chemical processes of the sample, such as the geological sample, under the triaxial experimental conditions of the triaxial experimental device, that is, the crystal structure changes, in real time, to ensure the online coordinated experimental operation of the triaxial experimental device and the scanning device, thereby meeting the research needs of geological samples.

[0016] In a second aspect, the present invention also provides a testing system, comprising a first fluid filling device, a second fluid filling device, a scanning device, and the triaxial experimental device based on in-situ X-ray analysis as described above, and also comprising a collection device, wherein the collection device is connected to the triaxial experimental device based on in-situ X-ray analysis.

[0017] Therefore, since the test system at least includes the triaxial experimental device based on in-situ X-ray analysis, the test system at least has all the technical effects of the triaxial experimental device based on in-situ X-ray analysis, which will not be repeated here.

[0018] In a third aspect, the present invention further provides a testing method, based on the testing system according to claim 8, characterized in that it comprises the following steps:

[0019] Move the three-axis experimental device of the test system to the scanning device, and adjust the height of the container body in the three-axis experimental device so that the installation position height of the sample set in the container body corresponds to the height of the original standard sample stage in the scanning device;

[0020] Adjusting the angular position of the container body so that the length direction of the slit on the container body is consistent with the arrangement direction of the emission source and the detector, so that the X-rays emitted by the emission source and the X-rays received by the detector after diffraction by the sample can both pass through the slit;

[0021] Control the first fluid filling device to fill the first fluid flow channel and the second fluid flow channel of the container body with confining pressure fluid and axial pressure fluid respectively, so that the sample reaches the predetermined confining pressure data and the predetermined axial pressure data, and control the second fluid filling device to fill the pore fluid into the fluid inlet flow channel of the container body, so that the sample reaches the predetermined pore pressure data;

[0022] The flow rate of the confining pressure fluid or the axial pressure fluid is increased again, and the mechanical data of the sample is recorded by a collection device; and the X-ray diffraction data of the sample under triaxial pressure conditions is collected by a scanning device; wherein the mechanical data includes the current confining pressure data, the current axial pressure data, the displacement of the axial pressure rod assembly, and the current pore pressure data corresponding to the sample after the flow rate of the confining pressure fluid or the axial pressure fluid is increased again;

[0023] The mechanical data and the X-ray diffraction data are saved, the confining pressure fluid, the axial pressure fluid and the pore fluid are unloaded, and a sample is taken out.

[0024] Therefore, the test method is based on the above test system, so the test method at least has all the technical effects of the test system, which will not be repeated here.

[0025] Optionally, controlling the first fluid charging device to charge the confining pressure fluid and the axial pressure fluid into the first fluid flow channel and the second fluid flow channel of the container body respectively so that the sample reaches a predetermined confining pressure data and a predetermined axial pressure data, and controlling the second fluid charging device to charge the pore fluid into the fluid inlet flow channel of the container body so that the sample reaches a predetermined pore pressure data comprises:

[0026] Controlling the first fluid filling device to work, so as to fill the first cavity of the container body with a confining pressure fluid through the first fluid flow channel of the container body and act on the sample to load the confining pressure;

[0027] Controlling the first fluid filling device to work, so as to fill the fluid inlet space of the container body with axial pressure fluid through the second fluid flow channel of the container body and act on the sample to load axial pressure;

[0028] Loading the confining pressure to a predetermined confining pressure data according to a first preset flow rate, and loading the axial pressure to a predetermined axial pressure data according to a second preset flow rate;

[0029] The second fluid filling device is controlled to work so as to fill the pore fluid into the fluid inlet channel of the container body so that the fluid pressure acting on the sample reaches the predetermined pore pressure data. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the relative position structure of the container body and the mounting base in an embodiment of the present invention;

[0031] Figure 2 It is a schematic diagram of the positions of the online cooperation of the three-axis experimental device and the scanning device in the embodiment of the present invention;

[0032] Figure 3 It is a schematic diagram of the explosion structure of the container body in an embodiment of the present invention;

[0033] Figure 4 is a schematic diagram of the cross-sectional structure of a container body in an embodiment of the present invention;

[0034] Figure 5 Schematic diagram of the axial structure of the first pressing head in an embodiment of the present invention;

[0035] Figure 6 for Figure 4 Schematic diagram of the enlarged structure at point A in the middle.

[0036] Description of reference numerals:

[0037] 1-leg assembly; 11-chassis; 12-first connecting piece; 13-second connecting piece; 14-fastener; 2-frame assembly; 21-first annular structure; 22-third connecting piece; 23-second annular structure; 24-handle; 25-locking structure; 26-column; 27-third annular structure; 3-container body; 4-upper cover; 41-slit; 42-groove structure; 5-housing; 6-container bottom plate; 70-axial pressure rod assembly; 701-fluid inlet Flow channel; 702-fluid discharge flow channel; 703-return port; 71-first pressure head; 711-first fluid flow channel; 712-second fluid flow channel; 713-leak detection flow channel; 72-positioning piece; 73-transmitting top plate; 74-limiting top plate; 75-annular protrusion; 76-second pressure head; 77-seepage metal ring; 78-transfer pipeline; 79-first support ring; 80-second support ring; 81-support seat; 8-emitter; 9-detector; 10-sample. DETAILED DESCRIPTION

[0038] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0039] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein.

[0040] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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; 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 elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] In the description of this specification, the description with reference to the terms "embodiment", "one embodiment" and "one implementation" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or implementation are included in at least one embodiment or implementation of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or implementation. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or implementations in a suitable manner.

[0042] In order to solve the above technical problems, an embodiment of the present invention provides a triaxial experimental device based on in-situ X-ray analysis, which is applied to a test system, including:

[0043] A container body 3, wherein the container body 3 comprises an upper cover 4, an outer shell 5 and a triaxial pressure assembly, wherein the triaxial pressure assembly is arranged in the outer shell 5, and a mounting position for placing a sample 10 is arranged on the top of the triaxial pressure assembly, and a first fluid filling device and a second fluid filling device of a test system are respectively connected to the triaxial pressure assembly to cooperate with the triaxial pressure assembly to perform a triaxial pressure test on the sample 10; the upper cover 4 is detachably connected to the top of the outer shell 5, and the upper cover 4 is provided with a slit 41; a scanning device for scanning and recording X-ray diffraction data of the sample 10 under triaxial pressure conditions is arranged above the container body 3, and the scanning device comprises an emission source 8 for emitting X-rays to scan the sample 10 and a detector 9 for receiving the X-rays diffracted by the sample 10, and the slit 41 is used to allow the X-rays emitted by the emission source 8 to enter the container body and the X-rays after passing through the sample 10 to be emitted from the container body to the detector 9;

[0044] A mounting base, on which the container body 3 is arranged.

[0045] It should be noted that, combined with Figure 1 and Figure 3As shown, the mounting base is used to support the container body 3 so as to install the container body 3. The outer shell 5 is a shell structure with a cavity inside and an opening at one end, and the triaxial pressure assembly can be installed in the cavity of the outer shell 5 from the opening. The first fluid filling device and the second fluid filling device are respectively connected to the triaxial pressure assembly to perform a triaxial pressure test on the sample 10 and obtain corresponding mechanical data; the first fluid filling device is connected to the triaxial pressure assembly to output axial pressure fluid and confining pressure fluid to the triaxial pressure assembly and act on the sample 10, so as to perform an axial pressure test and a confining pressure test on the sample 10, and obtain axial pressure data and confining pressure data; the second fluid filling device is connected to the triaxial pressure assembly to output pore fluid to the triaxial pressure assembly and act on the sample 10, so as to perform a pore pressure test on the sample 10 and obtain pore pressure data; the mechanical data includes axial pressure data, confining pressure data and pore pressure data, axial pressure displacement, etc. The above-mentioned sample 10 refers to a material sample, wherein the material sample can be a geological sample. Therefore, the triaxial experimental device based on in-situ X-ray analysis of the present invention can perform triaxial pressure tests based on in-situ X-ray analysis on various material samples.

[0046] In-situ X-ray analysis means that the container body in the triaxial experimental device in this embodiment replaces the original sample stage in the X-ray diffractometer, and the sample in the container body at the original sample stage position is scanned in real time by X-rays, so as to measure in real time the physical and chemical processes of the sample, that is, the crystal structure changes, under the triaxial experimental conditions of the triaxial experimental device.

[0047] Combination Figure 1 and Figure 2 As shown, a mounting position is provided on the side of the triaxial pressure assembly facing the upper cover 4 for mounting the sample 10, and a slit 41 is opened in the upper cover 4, and the slit 41 passes through the center of the upper cover 4. If the projection of the outer shell 5 and the upper cover 4 on the ground is a circular structure, the slit 41 passes through the center position of the upper cover 4, and the mounting position and the sample 10 on the mounting position are directly below the slit 41, so that the X-rays emitted by the emission source 8 of the scanning device can clearly scan the sample 10, and the detector 9 receives the X-rays diffracted by the sample 10, so that the X-ray diffraction data of the sample 10 under the triaxial pressure conditions of the container body 3 can be obtained.

[0048] In the embodiment of the present invention, the upper cover 4 is detachably connected to the top of the outer shell 5, and a mounting position for placing the sample 10 is provided on the top of the triaxial pressure assembly, so that when the upper cover 4 is opened, the sample 10 can be placed at the mounting position of the triaxial pressure assembly provided in the outer shell 5; by providing the container body 3 on the mounting base, it is convenient to move the container body 3 to one side of the scanning device, such as below, through the mounting base, wherein the height of the mounting base can be adjusted to adjust the height of the container body 3 provided in the mounting base, so that the height of the mounting position of the container body 3 matches the height of the original standard sample stage in the scanning device, such as an X-ray diffractometer, so that the container body 3 can replace the original standard sample stage in the X-ray diffractometer, so that the triaxial experimental device and the scanning device, such as an X-ray diffractometer, can be used online.

[0049] The first fluid filling device of the test system is connected to the triaxial pressure assembly, so that the confining pressure fluid and the axial pressure fluid can be input into different flow channels in the triaxial pressure assembly through the first fluid filling device and act on the sample 10, so as to perform confining pressure test and axial pressure test on the sample 10. The second fluid filling device is connected to the triaxial pressure assembly, so that the pore fluid can be input into the triaxial pressure assembly to perform pore pressure test on the sample 10, thereby realizing the triaxial experimental operation on the sample 10 and obtaining the corresponding mechanical data of the geological sample 10; by setting a slit 41 in the upper cover 4, and the scanning device includes a transmitting source 8 and a detector 9, when the scanning device is connected to the triaxial pressure assembly, the pore fluid can be input into the triaxial pressure assembly to perform pore pressure test on the sample 10, thereby realizing the triaxial experimental operation on the sample 10 and obtaining the corresponding mechanical data of the geological sample 10. When performing XRD test on sample 10, the length direction of slit 41 is parallel to or corresponds to the plane where the emission source 8 for emitting X-rays and the detector 9 for receiving X-rays are located, so that the X-rays emitted by the emission source of the scanning device can pass through slit 41 and can irradiate and scan the sample 10 in the container body 3. After diffracting by the sample 10, the X-rays can pass through slit 41 and enter detector 9, so that the scanning device can measure the physical and chemical process of geological sample 10 under the triaxial experimental conditions of triaxial experimental device, that is, the crystal structure change in real time, so as to ensure the online cooperation experimental operation of triaxial experimental device and scanning device, thereby meeting the research needs of geological sample 10.

[0050] Combination Figure 1 As shown, the mounting base is used to adjust the height and angle of the container body 3 so as to facilitate the online use with the scanning device. The mounting base includes a frame assembly 2 and a leg assembly 1, and has a storage space for accommodating the container body 3 of the triaxial pressure test container. The frame assembly 2 is used to connect with the circumferential side wall of the container body 3 to support the container body 3; the leg assembly 1 is arranged below the frame assembly 2 and connected to the frame assembly 2, and is used to adjust the height of the container body 3 by adjusting the height of the frame assembly 2.

[0051] In one embodiment of the present invention, the leg assembly 1 includes a plurality of leg structures arranged in a ring-shaped interval around the vertical axis of the frame assembly 2, each of the leg structures includes a chassis 11, a first connecting member 12 and a second connecting member 13, the first connecting member 12 is connected to the chassis 11, the second connecting member 13 is connected to the frame assembly 2, the second connecting member 13 is connected to the first connecting member 12, and is used to move relative to the first connecting member 12 to adjust the height of the frame assembly 2.

[0052] There are multiple connection modes between the first connecting member 12 and the second connecting member 13 to achieve height adjustment of the frame assembly 2 , which can be generally divided into an automatic control mode to adjust the height of the frame assembly 2 , or a manual control mode to adjust the height of the frame assembly 2 .

[0053] Among them, when the automatic control method is adopted, for example, the first connecting member 12 can be a lifting power component, the second connecting member 13 can be a support block, the lifting power component is installed on the chassis 11, the lifting end of the lifting power component is connected to the support block, and the support block is connected to the frame assembly 2, so that the support block is driven by the power drive of the lifting power component to drive the frame assembly 2 to rise or fall; wherein, the lifting power component can be a vertically arranged lifting motor, lifting cylinder, lifting cylinder, hydraulic cylinder, electric telescopic rod, etc., as long as the lifting power component can drive the lifting action of the frame assembly 2, it is applicable to the present technical solution, and no specific limitation is made here.

[0054] When manual control is used, the two connectors are connected in another way, for example, Figure 1 As shown, the leg assembly also includes a fastener 14, the first connecting member 12 is a screw rod, the second connecting member 13 is a support nut, the fastener 14 can be a fastening nut, one end of the screw rod is connected to the chassis 11, and the screw rod is sequentially passed through the support nut, the third annular structure 27 of the frame assembly and the fastener 14 along its own extension direction, and the support nut is used to rotate relative to the screw rod.

[0055] It should be noted that the screw rod can be supported by the chassis 11. Since the support nut is sleeved on the outside of the screw rod and is located below the third annular structure 27 in the frame assembly 2, the position of the frame assembly 2 can be supported. Since the fastener 14 is sleeved on the screw rod and is located above the third annular structure 27 in the frame assembly 2, the height position of the frame assembly 2 can be locked from above the third annular structure 27, so that the frame assembly 2 is more stable during the experiment and prevents tilting. When adjusting the height of the frame assembly 2, the support nut and the fastening nut can be rotated relative to the screw rod to more accurately adjust the height position of the support nut, and the height of the frame assembly 2 and the container body 3 set in the frame assembly 2 can be more accurately adjusted.

[0056] In one embodiment of the present invention, Figure 1 As shown, the frame assembly 2 includes a first annular structure 21, a third connecting member 22, a second annular structure 23, a handle 24, a locking structure 25, a column 26 and a third annular structure 27, wherein the third annular structure 27 is sleeved on the first connecting member 12 and is located at the upper part of the second connecting member 13, a plurality of columns 26 are arranged at intervals on the third annular structure 27, and one end of each column 26 away from the third annular structure 27 is connected to the second annular structure 23, the first annular structure 21 is arranged above the second annular structure 23, and is used to rotate on the second annular structure 23; a plurality of third connecting members 22 arranged at intervals are provided on the first annular structure 21, and the container itself is provided with a plurality of third connecting members 22 arranged at intervals. A groove structure 42 is provided on the circumferential side wall of the body 3, and the third connecting member 22 is passed through the first annular structure 21 and inserted into the groove structure 42. At this time, the container body 3 can be supported from the side wall of the container body 3 through the third connecting member 22; the handle 24 is connected to the first annular structure 21; the locking structure 25 includes a locking base and a locking member arranged on the locking base; the locking base is arranged on the first annular structure 21, and the locking member is used to move relative to the locking base to lock or release the second annular structure 23. At this time, the current positions of the first annular structure 21 and the second annular structure 23 can be locked or unlocked.

[0057] It should be noted that the first annular structure 21, the second annular structure 23 and the third annular structure 27 can be circular ring structures, the third connecting member 22 can be an adjusting bolt, the groove structure 42 can be a threaded hole, and the locking structure 25 includes a locking base and a locking member arranged on the locking base; the locking base is arranged on the first annular structure 21.

[0058] Further, the frame assembly 2 is an annular frame structure with an accommodating space, so that when the container body 3 is placed in the annular frame structure from the first annular structure 21, when the adjusting bolt is inserted into the threaded hole, the connection between the adjusting bolt and the container body 3 is more secure, preventing the container body 3 from loosening relative to the frame assembly 2; the number of the third connecting members 22 can be multiple, and the multiple third connecting members 22 are arranged on the first annular structure 21 in an annular interval, and the groove structure 42 can be an annular groove arranged on the circumferential side wall of the container body 3, or can be a plurality of threaded holes arranged on the circumferential side wall of the container body 3 at intervals, and the multiple third connecting members 22 arranged in an annular interval are respectively inserted into the groove structure 42 on the circumferential side wall of the container body 3, so that the entire container body 3 can be stably supported from the circumferential direction of the container body 3, and the installation stability of the container body 3 is further enhanced. When the container body 3 needs to be taken out from the first annular structure 21, the third connecting member 22 can be operated to disengage from the groove structure 42 of the container body 3, so that the container body 3 is free from the restriction of the third connecting member 22, thereby facilitating the removal of the container body 3 from the first annular structure 21. Since the container body 3 is a cylindrical structure, the first annular structure 21 and the second annular structure 23 can prevent the container body 3 from tipping over from the circumference of the container body 3 to ensure the installation stability of the container body 3 .

[0059] Furthermore, a slit 41 is provided at the top of the container body 3 for the rays to pass through, and the first annular structure 21 is arranged on the second annular structure 23 and is used to rotate relative to the second annular structure 23 to adjust the position of the slit 41. Specifically, the first annular structure 21 is rotatably connected relative to the second annular structure 23, so that the container body 3 is driven to rotate relative to the second annular structure 23 around the central axis of the first annular structure 21 and the second annular structure 23 by operating the first annular structure 21, so that the angular position of the slit 41 on the container body 3 changes, so that the length direction of the slit 41 on the container body 3 is consistent with the arrangement direction of the emission source 8 and the detector 9 of the scanning device, so that the X-rays emitted by the emission source 8 and the X-rays received by the detector 9 after diffraction by the sample 10 can both pass through the slit 41.

[0060] Furthermore, the handle 24 is connected to the first annular structure 21, and the third connecting member 22 is inserted through the first annular structure 21 and connected to the container body 3. In other words, the gravity of the container body 3 will be applied to the first annular structure 21, so by operating the handle 24, the first annular structure 21 and the container body 3 can be driven to rotate relative to the second annular structure 23, that is, it is more labor-saving during the rotation process. The number of handles 24 can be more than two, and the more than two handles 24 are symmetrically arranged with respect to the central axis of the first annular structure 21, so that it is more convenient to rotate the first annular structure 21. The handle 24 and the first annular structure 21 can be fixed by welding or the like, or can be detachable, which is not specifically limited here.

[0061] Further, the locking base can be fixedly installed on the first annular structure 21 by means of bolts, rivets or welding; the connection method between the locking member and the locking base and the locking with the first annular structure 21 or the second annular structure 23 can be adopted as follows, and the locking base fixedly installed on the first annular structure 21 is taken as an example for specific description. When the locking member is a knob structure, one end of the knob structure is a knob and the other end is a bolt, and the bolt of the knob structure is penetrated through the locking base; when it is necessary to rotate the container body 3 to the angular position posture required for the experimental operation of the container body 3, the knob structure is manually operated to make the bolt of the knob structure move away to loosen the second annular structure 23, thereby effectively releasing the current position lock of the first annular structure 21 and the second annular structure 23, so as to operate the first annular structure 21 to drive the container body 3 to rotate relative to the second annular structure 23; after the angular position of the container body 3 is adjusted, the knob structure is manually operated to make the bolt of the knob structure abut against the second annular structure 23, thereby effectively locking the current position of the first annular structure 21 and the second annular structure 23. For another example, when the locking member is a rotating buckle, one end of the rotating buckle is rotatably connected to the locking base, a protrusion matching the rotating buckle is preset on the second annular structure 23, and the other end of the rotating buckle is rotated relative to the second annular structure 23 to be sleeved on the protrusion, thereby also locking the position of the first annular structure 21 and the second annular structure 23.

[0062] Furthermore, the plurality of columns 26 arranged in an annular pattern can not only distribute the gravity of the container body 3, but also increase the height of the entire mounting base accordingly. The top and bottom ends of the columns 26 respectively correspond to the second annular structure 23 and the third annular structure 27 and can be fixed by welding or threaded connection, which is not specifically limited here.

[0063] In addition, the frame assembly also includes a plurality of connection blocks arranged in a ring-shaped interval around the vertical axis of the second annular structure 23, and the plurality of connection blocks are detachably connected to the second annular structure 23; the top end of each of the columns 26 is connected to each of the connection blocks respectively.

[0064] It should be noted that, the plurality of connecting blocks are detachably connected to the second annular structure 23, and one end of each of the columns 26 is connected to each of the connecting blocks, so that each of the columns 26 is connected to the second annular structure 23 through the corresponding connecting blocks, thereby effectively increasing the connection area between the columns 26 and the second annular structure 23, reducing the pressure applied by the container body 3 to the columns 26 through the first annular structure 21 and the second annular structure 23, thereby improving the rigidity of the support portion, and correspondingly making the installation of the container body 3 more stable.

[0065] The connection block and the second annular structure 23 can be detachably connected by bolts, so that different types of container bodies 3 can be supported and installed by replacing the first annular structure 21 and the support connection block, the second annular structure 23 and the third annular structure 27 of different sizes according to the size of the container body 3 of different models and diameters. One end of the column 26, such as the top end, can be connected to the corresponding connection block by welding or bolts, which is not specifically limited here.

[0066] In one embodiment of the present invention, the three-axis pressure assembly includes an axial pressure rod assembly 70 and a sleeve, wherein the axial pressure rod assembly 70 is arranged in the outer shell 5 along the axial direction of the outer shell 5, and the sleeve is sleeved on the top of the axial pressure rod assembly 70 and the outside of the sample 10, and the sample 10 is located below the slit 41 of the upper cover 4.

[0067] It should be noted that the axial pressure rod assembly 70 is arranged in the shell 5 along the axial direction of the shell 5, so the axial pressure rod assembly 70 coincides with the central axis of the shell 5, and the end of the axial pressure rod assembly 70 close to the upper cover 4 is the top of the axial pressure rod assembly 70. A mounting position is set at the top of the axial pressure rod assembly 70, and the sample 10 is set at the mounting position and is sleeved on the sample 10 and the top of the axial pressure rod assembly 70 through a sleeve, so that the sleeve not only shapes the sample 10, and positions the sample 10 on the mounting position on the axial pressure rod assembly 70 to prevent the sample 10 from tipping over, but also prevents the confining pressure fluid from directly penetrating the sample 10 when the sample is subjected to a confining pressure test, so as to ensure the accuracy of the confining pressure test of the sample 10. The sleeve can be a heat shrink tube, and can also be a sleeve made of other materials that can be penetrated by X-rays, so it is not specifically limited here.

[0068] The sample 10 is disposed directly below the slit 41 , so that the scanning device can clearly scan the crystal structure changes of the sample 10 under the above-mentioned three-axis pressure test conditions.

[0069] In addition, the three-axis pressure assembly in the housing 5 can be supported in the following manner, for example, an annular sink is provided at the inner bottom of the housing 5, and the three-axis pressure assembly is provided in the housing 5 and on the annular sink, thereby supporting the three-axis pressure assembly. Figure 3 and Figure 4 As shown, the container body 3 also includes a container bottom plate 6, which is arranged on the side of the outer shell 5 away from the upper cover 4. The container bottom plate 6 is an annular plate structure, and the inner diameter of the annular plate structure is smaller than the outer diameter of the three-axis pressure assembly. Therefore, when the three-axis pressure assembly is arranged in the outer shell 5, the container bottom plate 6 with an annular plate structure can support the three-axis pressure assembly from below; wherein, the upper cover 4, the outer shell 5 and the container bottom plate 6 can be connected by bolt fasteners, for example, the bolts pass through the container bottom plate 6, the outer shell 5 and the upper cover 4 in turn and are fastened by nuts, thereby realizing the assembly of the upper cover 4, the outer shell 5 and the container bottom plate 6; wherein, the three-axis pressure assembly can be loaded into the outer shell 5 from the lower opening of the outer shell 5, and the sample 10 can be installed at the installation position from the upper opening of the outer shell 5.

[0070] In one embodiment of the present invention, Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, the three-axis pressure assembly also includes a first pressure head 71, a first support ring 79, a second support ring 80 and a positioning member 72. The shell 5 is provided with a first cavity and a second cavity arranged along its own axial direction and interconnected. The first pressure head 71 is embedded in the second cavity. The top end of the axial pressure rod assembly 70 is passed through the first pressure head 71 and is in the first cavity. The positioning member 72 is arranged at the top end of the axial pressure rod assembly 70 and between the outside of the sleeve and the inner wall of the shell 5. The first support ring 79 and the second support ring 80 are arranged in the first cavity and are respectively located on the upper and lower sides of the positioning member 72; the first pressure head 71 is provided with a first fluid flow channel 711 connected to the first cavity, and the positioning member 72 is a circular ring structure made of porous rubber. The first fluid filling device is connected to the first fluid flow channel 711, and is used to output the confining pressure fluid to flow through the first fluid flow channel 711, the first cavity and the positioning member 72 in sequence and act on the sleeve sleeved outside the sample 10.

[0071] It should be noted that the shell 5 is provided with a first cavity and a second cavity which are arranged along its own axial direction and are interconnected. In other words, the first cavity is above the second cavity and the two are connected, so as to facilitate the first pressure head 71 to be arranged in the second cavity. The first pressure head 71 can be a cylindrical structure with an axial through hole inside, and the cylindrical structure is not a standard cylinder; the axial pressure rod assembly 70 is penetrated through the axial through hole of the first pressure head 71 along the axial direction of the first pressure head 71, and the part of the structure of the axial pressure rod assembly 70 exceeding the first pressure head 71 is in the first cavity. By arranging the positioning member 72 at the top end of the axial pressure rod assembly 70 and between the outside of the sleeve and the inner wall of the outer shell 5, in other words, the positioning member 72 is wrapped around the top end of the axial pressure rod assembly 70 and the outside of the sleeve, and is tightly attached to the inner wall of the outer shell 5, and the positioning member 72 is a circular ring structure made of porous rubber, so that the positioning member 72 not only facilitates the confining pressure fluid in the first cavity to pass through and act on the outside of the sleeve outside the sample 10 to perform the confining pressure test, but also plays a certain positioning role for the sample 10 during the triaxial pressure test, thereby reducing the offset.

[0072] The first support ring 79 and the second support ring 80 are arranged in the first cavity and are respectively located at the upper and lower sides of the positioning member 72, wherein the first support ring 79 can be a metal ring of an annular structure, and the first support ring 79, the positioning member 72 and the second support ring 80 can be installed on the axial pressure rod assembly 70 by bolts and are located in the first cavity, so the axial pressure rod assembly 70 provides an installation basis for the first support ring 79, the positioning member 72 and the second support ring 80; in addition, the first support ring 79 is arranged above the positioning member 72 and contacts the upper surface of the positioning member 72, thereby also playing an upper limit role for the positioning member 72 from above to prevent the positioning member 72 from moving upward. The three-axis pressure assembly also includes a second support ring 80, which is arranged below the positioning member 72 and contacts the lower surface of the positioning member 72, thereby playing a lower limit role for the positioning member 72 from below to prevent the positioning member 72 from moving downward.

[0073] The first pressure head 71 is connected to the first fluid flow channel 711 through the first fluid filling device, and is provided with a first fluid flow channel 711 connected to the first cavity. Therefore, when performing a confining pressure test, the confining pressure fluid output by the first fluid filling device passes through the first fluid flow channel 711 and the first cavity in sequence, passes through the positioning member 72, and acts on the sleeve sleeved outside the sample 10, so as to utilize the confining pressure fluid to squeeze the sample 10, thereby realizing a confining pressure test on the sample 10.

[0074] The positioning member 72 is a circular ring structure made of porous rubber that allows the confining pressure fluid to penetrate easily.

[0075] Combination Figure 4 and Figure 6As shown, annular sealing rings are respectively arranged between the first support ring 79 and the housing 5, between the first pressure head 71 and the housing 5, between the annular protrusion 75 and the first pressure head 71, and between the shaft pressure rod assembly 70 and the first pressure head, wherein: Figure 4 and Figure 6 The solid circle in is the annular sealing ring.

[0076] In one embodiment of the present invention, Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, the three-axis pressure assembly also includes a limiting top plate 74, a third cavity is provided inside the first pressure head 71, and an annular protrusion 75 is provided on the outer wall of the axial pressure rod assembly 70. The annular protrusion 75 is sealed with the circumferential inner wall of the third cavity, and a fluid entry space is preset between the annular protrusion 75 and the inner bottom wall of the third cavity. The first pressure head 71 is also provided with a second fluid flow channel 712 connected to the fluid entry space, and the limiting top plate 74 is arranged between the sample 10 and the upper cover 4. The first fluid filling device is connected to the second fluid flow channel 712, and is used to output the axial pressure fluid to flow through the second fluid flow channel 712 and the fluid entry space in sequence, so as to push the annular protrusion 75 to drive the axial pressure rod assembly 70 to move axially.

[0077] It should be noted that when the sample is subjected to confining pressure test and axial pressure test, the confining pressure fluid and the axial pressure fluid can use liquid as the medium, such as high-purity water, or use inert gas as the medium, such as nitrogen or argon. Therefore, the first fluid filling device outputs the corresponding confining pressure liquid or confining pressure gas to the first fluid flow channel 711, and outputs the corresponding axial pressure liquid or axial pressure gas to the second fluid flow channel 712; the outer wall of the axial pressure rod assembly 70 is provided with an annular protrusion 75, and the central axis of the annular protrusion 75 coincides with the central axis of the axial pressure rod assembly 70. The axial pressure rod assembly 70 and the annular protrusion 75 can be an integrally formed structure or a detachable structure. When the axial pressure rod assembly 70 and the annular protrusion 75 can be an integrally formed structure, when the annular protrusion When the protrusion 75 is subjected to the upward force of the axial pressure fluid, it can push the axial pressure rod assembly 70 to move upward synchronously, so that there will be no relative movement between the axial pressure rod assembly 70 and the annular protrusion 75, so as to ensure the accuracy of the displacement caused by the up and down movement of the axial pressure rod assembly 70 in the axial pressure test; when the axial pressure rod assembly 70 and the annular protrusion 75 can be a detachable structure, since the annular protrusion 75 needs to move up and down relative to the first pressure head 71 during the axial pressure test, in other words, there is relative friction between the annular protrusion 75 and the inner wall of the first pressure head 71. Once wear or leakage occurs between the annular protrusion 75 and the inner wall of the first pressure head 71, it will affect the accuracy of the up and down displacement of the axial pressure rod assembly 70, so that the newly replaced annular protrusion 75 can be used to reduce maintenance costs.

[0078] By opening a third cavity inside the first pressure head 71, the annular protrusion 75 is placed in the third cavity. When the annular protrusion 75 is placed in the third cavity, a fluid entry space is reserved between the bottom of the annular protrusion 75 and the inner bottom wall of the third cavity. The fluid entry space may be an annular groove structure. By providing a second fluid flow channel 712 in communication with the fluid entry space in the first pressure head 71, when performing an axial pressure test, the first fluid filling device outputs an axial pressure fluid, and the axial pressure fluid first enters the fluid entry space. Since the fluid entry space is an annular groove structure, the internal space of the fluid entry space is limited. As the axial pressure fluid is continuously injected, the fluid enters the fluid entry space. The axial pressure fluid in the space generates an upward force on the annular protrusion 75 to drive the axial pressure rod assembly 70 to move upward relative to the first pressure head 71. Since the limiting top plate 74 is arranged between the sample 10 and the upper cover 4, and the sample 10 is installed in the installation position of the axial pressure rod assembly 70, the axial pressure rod assembly 70 drives the sample 10 to move upward. Since the limiting top plate 74 is arranged below the upper cover 4, the limiting top plate 74 serves as an upper limit for the axial pressure rod assembly 70 and the sample 10. At this time, the axial pressure rod assembly 70 and the limiting top plate 74 work together to squeeze the sample 10 in the middle position to realize the axial pressure test of the sample 10.

[0079] See Figure 4 and Figure 5 As shown, the first pressure head 71 is also provided with a leak detection channel 713, wherein a leak detection space is enclosed between the upper end of the annular protrusion 75 in the third cavity and the second pressure head 76, the upper end of the leak detection channel 713 is connected to the leak detection space, and the lower end of the leak detection channel 713 is connected to the pressure gauge; when the first fluid filling device fills the fluid entry space with axial pressure fluid through the second fluid flow channel 712 to drive the axial pressure rod assembly 70 to move upward to perform an axial pressure test on the sample, since the above-mentioned annular sealing ring is installed between the annular protrusion 75 and the first pressure head 71, if the pressure gauge has a reading at this time, it is judged that the axial pressure fluid in the fluid entry space enters the leak detection channel 713 through the leak detection space, thereby judging that there is a leakage problem of the axial pressure fluid in the fluid entry space, so the leak detection channel 713 is used to detect whether there is leakage of the axial pressure fluid in the fluid entry space.

[0080] The limiting top plate 74 can be a metal circular plate with a certain rigidity so that it can have an upper limit function. In addition, a strip-shaped interval is provided in the middle of the limiting top plate 74 to match the slit 41 of the upper cover 4, so that the X-ray passing through the slit 41 can smoothly pass through the strip-shaped interval and penetrate the transmission top plate 73 to scan the sample 10, and the strip-shaped interval will not block the X-ray scanning sample 10 emitted by the emission source 8 of the scanning device. The limiting top plate 74 can be a metal circular plate composed of two semicircles, and a strip-shaped interval is reserved between the two semicircles, which facilitates the rapid processing of the limiting top plate 74.

[0081] In one embodiment of the present invention, Figure 4 As shown, the three-axis pressure assembly also includes a second pressure head 76. A fourth cavity is also provided inside the first pressure head 71. The fourth cavity is located above the third cavity. The second pressure head 76 is arranged in the fourth cavity. The second pressure head 76 is used to limit the axial displacement height of the annular protrusion 75.

[0082] It should be noted that a fourth cavity is opened inside the first pressure head 71 to facilitate the arrangement of the second pressure head 76 in the fourth cavity, wherein the fourth cavity is above the third cavity. In addition, the diameter of the fourth cavity is larger than that of the third cavity, so that the second pressure head 76 will not drop when arranged in the fourth cavity; the distance between the bottom of the second pressure head 76 and the upper surface of the annular protrusion 75 in the third cavity is the maximum axial displacement of the axial pressure rod assembly 70 during the axial pressure test. Since the second pressure head 76 is above the annular protrusion 75, the second pressure head 76 can limit the axial displacement height of the axial pressure rod assembly 70 by blocking the annular protrusion 75.

[0083] In one embodiment of the present invention, Figure 4 and Figure 6As shown, the triaxial pressure assembly also includes a seepage metal ring 77, a transfer pipeline 78 and a transmission top plate 73, the transmission top plate 73 is arranged between the sample 10 and the limiting top plate 74, the first support ring 79 is provided with a sink and a gap flow channel, the seepage metal ring 77 is arranged in the sink, and the seepage metal ring 77 is sleeved outside the top of the sample 10; the interior of the axial pressure rod assembly 70 is provided with a fluid inlet flow channel 701 and a fluid outlet flow channel 702, and the axial pressure rod assembly 70 is also provided with a reflux port 703 at the first cavity, and the second fluid filling device is respectively connected to the fluid inlet flow channel 701 and the fluid outlet flow channel The channel 702 is circulated and is used for inputting fluid into the fluid inlet channel 701 and receiving fluid discharged from the fluid outlet channel 702. The transparent top plate 73 is arranged above the first support ring 79 and the seepage metal ring 77 and is in contact with and connected to the first support ring 79 and the seepage metal ring 77. The first support ring 79 is connected to the reflux port 703 through the transfer pipeline 78. The pore fluid of the fluid inlet channel 701 flows back to the fluid outlet channel 702 after passing through the sample 10, the seepage metal ring 77, the gap channel of the first support ring 79, the transfer pipeline 78, and the reflux port 703 in sequence.

[0084] It should be noted that when the pore pressure test is performed on the sample 10, the pore fluid output by the second fluid filling device for the fluid entering the flow channel 701 can be liquid, such as high-purity water, or inert gas, such as nitrogen or argon, which needs to be determined according to the experimental conditions such as the type and size of the sample. The transmission top plate 73 is set between the sample 10 and the limiting top plate 74. When the sample 10 is scanned by the scanning device, the emission source 8 of the scanning device emits X-rays to first pass through the strip interval of the limiting top plate 74, and then pass through the transmission top plate 73 to scan the sample 10, thereby realizing the collection of the crystal structure changes of the sample 10 under the triaxial pressure test conditions. In addition, the limiting top plate 74 is set above the transmission top plate 73, which can play an upper limit role on the sample 10, and the transmission top plate 73 can also effectively prevent the pore fluid from leaking from the contact between the upper cover 4 and the sample 10, so as to play a sealing role for the pore fluid. The transmission top plate 73 may be a circular plate made of metal beryllium. Since metal beryllium has a small atomic number and a low X-ray absorption rate, metal beryllium is used as the transmission top plate 73 to facilitate X-rays to pass through, so that the attenuation rate of X-rays passing through metal beryllium is smaller.

[0085] The first support ring 79 is provided with a sink and a gap flow channel, wherein the sink can be an annular sink, so that the seepage metal ring 77 can be installed on the sink, and the first support ring 79 provides a mounting base for the seepage metal ring 77 arranged on the sink. The transmission top plate 73 is arranged above the first support ring 79 and the seepage metal ring 77 and is in contact and connected with the first support ring 79 and the seepage metal ring 77, so that when the fluid enters the flow channel 701 and flows upward through the sample 10 and enters the seepage metal ring 77, it can flow downward through the gap flow channel of the first support ring 79 and enter the transfer pipeline 78. The transmission top plate 73 also seals the pore fluid passing through the seepage metal ring 77, preventing the pore fluid passing through the seepage metal ring 77 from leaking from the contact between the seepage metal ring 77 and the limiting top plate 74. The seepage metal ring 77 is sleeved on the top of the sample 10 so that the porous fluid passing through the inside of the sample 10 can smoothly enter the seepage metal ring 77, and then flow back to the fluid discharge channel 702 through the gap flow channel of the first support ring 79, the transfer pipeline 78 and the reflux port 703. Therefore, the seepage metal ring 77 and the first support ring 79 can also play a role in guiding the porous fluid passing through the sample 10 and the transfer pipeline 78.

[0086] Among them, the seepage metal ring 77 is used for the porous fluid to pass through it, so the seepage metal ring 77 can be a circular ring structure made of foam titanium material, or a circular ring structure made of other materials that can facilitate the porous fluid to pass through, so as long as the metal ring structure that can facilitate the porous fluid to pass through is applicable to the present technical solution, and no further description is given here. The upper end of the transfer pipeline 78 is connected to the first support ring 79, and the lower end is connected to the return port 703, so that the porous fluid passing through the seepage metal ring 77 can be smoothly guided to the return port 703 through the gap flow channel of the first support ring 79. Among them, the transfer pipeline 78 is also provided with a first sealing nut at the position where it passes through the positioning member 72 and the first support ring 79, and the transfer pipeline 78 is also provided with a second sealing nut at the position where it connects to the return port 703, so the first sealing nut and the second sealing nut can effectively prevent the porous fluid from leaking when flowing through the first support ring 79 and the return port 703 respectively. The transfer pipeline 78 can be a pipeline made of metal material and has a certain curvature.

[0087] When the pore pressure test is performed on the sample 10, the second fluid filling device communicates with the fluid inlet channel 701 and the fluid outlet channel 702 respectively, so that the pore fluid output by the second fluid filling device first enters the fluid inlet channel 701, then flows upward along the fluid inlet channel 701, and then passes through the inside of the sample 10. Since the seepage metal ring 77 is sleeved on the top of the sample 10, the pore fluid passing through the sample 10 enters the seepage metal ring 77 again, and then flows back to the fluid outlet channel 702 along the gap channel of the first support ring 79 and the transfer pipeline 78 through the reflux port 703, so that the pore pressure test of the sample 10 can be achieved through the pore fluid.

[0088] In one embodiment of the present invention, Figure 3 As shown, the triaxial experimental device based on in-situ X-ray analysis also includes a support seat 81, and the sample 10 is arranged above the support seat. The support seat 81 is arranged at the top end of the axial pressure rod assembly 70 for installing samples 10 of different sizes.

[0089] It should be noted that by setting a support seat 81 at the top of the axial pressure rod assembly 70, the support seat 81 is provided with the mounting position, and the sample 10 is installed on the mounting position on the support seat. By replacing the support seats 81 with different diameters and different heights, samples 10 of different sizes can be installed to meet the triaxial pressure test requirements for samples 10 of different sizes.

[0090] When the support seat 81 is used to install samples 10 of different sizes, the support seat 81 can be detachably installed on the top of the axial pressure rod assembly 70. For example, the support seat 81 can be directly placed on the top of the axial pressure rod assembly 70, or can be detachably installed on the top of the axial pressure rod assembly 70 in other ways, which are not specifically limited here. When the support seat 81 is used to install samples 10 of fixed sizes, the support seat 81 can be fixedly installed on the top of the axial pressure rod assembly 70 by, for example, welding, bolts, etc., or can be detachably installed on the top of the axial pressure rod assembly 70 in the above-mentioned detachable manner.

[0091] In addition, the axial pressure rod assembly 70 can be an axial pressure rod structure of an integrally formed structure, or can be composed of more than two detachable parts, for example, the axial pressure rod assembly 70 includes a first pressure rod, a second pressure rod and a third pressure rod arranged along the axial direction of the housing 5, wherein the first pressure rod and the second pressure rod are both in the first cavity of the housing 5, and the first pressure rod is provided with a mounting position for mounting the sample 10, the second pressure rod is below the first pressure rod, and the third pressure rod is below the second pressure rod, wherein the second pressure rod and the third pressure rod are both provided with a fluid inlet channel 701 and a fluid outlet channel 702, the first pressure rod is only provided with a fluid inlet channel 701, and the transfer pipeline 78 can be equivalent to the fluid outlet channel of the first pressure rod; the annular protrusion 75 is sleeved on the circumferential side wall of the third pressure rod. The first pressure rod, the second pressure rod and the third pressure rod can be three independent components, or two components, and the two components refer to any two of the first pressure rod, the second pressure rod and the third pressure rod being an integrally formed structure.

[0092] Another embodiment of the present invention provides a testing system, comprising a first fluid filling device, a second fluid filling device, a scanning device, and the triaxial experimental device based on in-situ X-ray analysis as described above, and also comprising a collection device, wherein the collection device is connected to the triaxial experimental device based on in-situ X-ray analysis.

[0093] Therefore, the test system has all the technical effects of the above-mentioned triaxial test device, which will not be repeated here. Among them, the acquisition device is used to collect the mechanical data of the sample 10 under the triaxial pressure test conditions. For example, the acquisition device at least includes a first pipeline, a first pressure sensor, a second pipeline, a second pressure sensor, a third pipeline, a fourth pipeline and a third pressure sensor, wherein the first fluid filling device is connected to the first fluid flow channel 711 of the first pressure head 71 through the first pipeline, and the first pressure sensor is arranged on the first pipeline, and is used to collect the pressure of the confining pressure fluid on the first pipeline, and the pressure of the confining pressure fluid can be used as the confining pressure data of the sample 10. The first fluid filling device is connected to the second fluid flow channel 712 of the first pressure head 71 through the second pipeline, and the second pressure sensor is arranged on the second pipeline, and is used to collect the pressure of the axial pressure fluid on the second pipeline, and the pressure of the axial pressure fluid can be used as the axial pressure data of the sample 10; in addition, the acquisition device also includes a displacement sensor, which can be installed on the axial pressure rod assembly 70 to collect the displacement of the axial movement of the axial pressure rod assembly 70.

[0094] The second fluid filling device is connected to the fluid inlet channel 701 and the fluid outlet channel 702 of the axial pressure rod assembly 70 through the third pipeline and the fourth pipeline respectively. The third pressure sensor is arranged on the third pipeline or the fourth pipeline, and is used to collect the fluid pressure data entering the sample 10. The fluid pressure data can be used as the pore pressure data of the sample 10.

[0095] Another embodiment of the present invention provides a testing method, based on the testing system as described above, comprising the following steps:

[0096] S1. Move the three-axis experimental device of the test system to the scanning device, and adjust the height of the container body 3 in the three-axis experimental device so that the installation height of the sample 10 set in the container body 3 corresponds to the height of the sample 10 on the original standard sample stage in the scanning device.

[0097] Therefore, the entire triaxial experimental device can be moved to the scanning device by means of the handle 24 on the mounting base, and the height of the container body 3 can be adjusted by adjusting the mounting base, so that the height of the mounting position set on the container body 3 corresponds to the height of the original standard sample stage in the scanning device, so as to replace the original standard sample stage in the scanning device, thereby facilitating the X-rays emitted by the emission source 8 of the scanning device to pass smoothly through the slit 41 of the upper cover 4 of the container body 3 and scan the sample 10 on the mounting position, so that the scanning device can collect the crystal structure changes of the sample 10 under the triaxial pressure experimental conditions.

[0098] S2. Adjust the angular position of the container body 3 so that the length direction of the slit 41 on the container body 3 is consistent with the arrangement direction of the emission source 8 and the detector 9, so that the X-rays emitted by the emission source 8 and the X-rays received by the detector 9 after diffraction by the sample 10 can both pass through the slit 41.

[0099] It should be noted that the angle of the container body 3 is adjusted by adjusting the mounting base so that the length direction of the slit 41 of the upper cover 4 of the container body 3 is parallel to the plane where the emission source 8 and the detector 9 of the scanning device are located, so as to ensure that the emission source 8 can smoothly pass through the slit 41 to irradiate the sample 10 after emitting X-rays, and at the same time facilitate the detector 9 to smoothly receive the X-rays diffracted by the sample 10.

[0100] After step S2, a vacuuming process is also included, in which the vacuum pump is connected to the first fluid flow channel 711 and the second fluid flow channel 712 respectively, so that the first cavity, i.e., the confining pressure cavity, is vacuumed through the first fluid flow channel 711, and the fluid enters the space or the third cavity through the second fluid flow channel 712, so as to ensure the test accuracy of the axial pressure test and the confining pressure test in which the same fluid needs to be introduced in the subsequent steps.

[0101] S3. Control the first fluid filling device to fill the first fluid flow channel 711 and the second fluid flow channel 712 of the container body 3 with confining pressure fluid and axial pressure fluid respectively, so that the sample 10 reaches the predetermined confining pressure data and the predetermined axial pressure data, and control the second fluid filling device to fill the pore fluid into the fluid inlet channel 701 of the container body 3, so that the sample 10 reaches the predetermined pore pressure data.

[0102] It should be noted that, by controlling the first fluid filling device, the confining pressure fluid is filled into the first cavity through the first fluid flow channel 711 of the container body 3 and acts on the sample 10, so that the sample 10 reaches the predetermined confining pressure data; by controlling the first fluid filling device, the axial pressure fluid is filled into the fluid entry space through the second fluid flow channel 712 of the container body 3, so that the sample 10 reaches the predetermined axial pressure data; the second fluid filling device is controlled to fill the pore fluid into the fluid entry channel 701 of the container body 3 and acts on the sample 10, so that the sample 10 reaches the predetermined pore pressure data. In other words, the confining pressure fluid, the axial pressure fluid and the pore fluid are respectively filled into the container body 3, so that the sample 10 reaches the set confining pressure, axial pressure and pore water pressure conditions.

[0103] S4. Increase the flow rate of the confining pressure fluid or the axial pressure fluid again, and record the mechanical data of the sample 10 through the acquisition device; and acquire the X-ray diffraction data of the sample 10 under triaxial pressure conditions through the scanning device; wherein the mechanical data include the current confining pressure data, current axial pressure data, displacement of the axial pressure rod assembly 70, and current pore pressure data corresponding to the sample 10 after the flow rate of the confining pressure fluid or the axial pressure fluid is increased again.

[0104] It should be noted that at the beginning of the experiment, while maintaining the confining pressure data equal to the axial pressure data, the flow rate of the confining pressure fluid is increased again, and the mechanical data of the sample 10 at this time is collected and recorded by the collection device; or, while maintaining the confining pressure data unchanged, the flow rate of the axial pressure fluid is increased again to promote the axial movement of the axial pressure rod assembly 70, and the mechanical data of the sample 10 at this time is collected and recorded by the collection device; at the same time, the X-ray diffraction data of the sample 10 under the above-mentioned three-axial pressure conditions is collected by the scanning device, wherein the X-ray diffraction data includes but is not limited to the crystal structure change process of the sample 10.

[0105] S5, saving the mechanical data and the X-ray diffraction data, unloading the confining pressure fluid, the axial pressure fluid and the pore fluid, and taking out the sample 10.

[0106] It should be noted that after the X-ray diffraction data of the sample 10 is collected under the triaxial pressure conditions, the experiment is ended. At this time, the mechanical data and the X-ray diffraction data are saved first, and then the confining pressure fluid, axial pressure fluid and pore fluid are unloaded, and finally the upper cover 4 is opened and the sample 10 is taken out.

[0107] In one embodiment of the present invention, S3, controlling the first fluid charging device to charge the first fluid flow channel 711 and the second fluid flow channel 712 of the container body 3 with the confining pressure fluid and the axial pressure fluid respectively, so that the sample 10 reaches the predetermined confining pressure data and the predetermined axial pressure data, and controlling the second fluid charging device to charge the pore fluid into the fluid inlet flow channel 701 of the container body 3, so that the sample 10 reaches the predetermined pore pressure data, includes:

[0108] S31, controlling the first fluid filling device to work, so as to fill the first cavity of the container body 3 with confining pressure fluid through the first fluid flow channel 711 of the container body 3 and act on the sample 10, so as to load the confining pressure.

[0109] Therefore, in order to facilitate the triaxial pressure test operation of sample 10, it is necessary to first load the sample 10 with a confining pressure process; for example, first control the first fluid filling device to work, so that the first fluid filling device outputs the confining pressure fluid, which first flows upward through the first fluid flow channel 711, then enters the first cavity of the outer shell 5, and then passes through the inside of the positioning member 72 and acts on the sleeve arranged outside the sample 10, and uses the confining pressure fluid to squeeze the sample 10 from the circumferential direction. This process is the loading of confining pressure.

[0110] S32, controlling the first fluid filling device to work, so as to fill the fluid inlet space of the container body 3 with axial pressure fluid through the second fluid flow channel 712 of the container body 3 and act on the sample 10, so as to load the axial pressure.

[0111] Therefore, in order to facilitate the triaxial pressure test operation of sample 10, it is necessary to subject sample 10 to a loading axial pressure process; for example, the first fluid filling device is controlled to work so that the first fluid filling device outputs an axial pressure fluid, which first flows upward through the second fluid flow channel 712 and then enters the fluid entry space, so that the space for the fluid to enter the space gradually becomes larger. At the same time, the axial pressure fluid in the fluid entry space acts on the annular protrusion 75 to drive the axial pressure rod assembly 70 to move axially. During the upward movement of the axial pressure rod assembly 70, the top end of the axial pressure rod assembly 70 and the limiting top plate 74 are used to squeeze the sample 10 from the bottom and the top respectively. This process is the described loading axial pressure.

[0112] S33, loading the confining pressure to the predetermined confining pressure data according to the first preset flow rate, and loading the axial pressure to the predetermined axial pressure data according to the second preset flow rate.

[0113] Therefore, the first preset flow rate refers to step-wise loading of the confining pressure to the predetermined confining pressure data based on the initial confining pressure data, and the second preset flow rate refers to step-wise loading of the axial pressure to the predetermined axial pressure data based on the initial axial pressure data. At this time, the crystal structure of the sample 10 will change internally during the loading of the confining pressure and the loading of the axial pressure, and in this process, the scanning device can emit X-rays to collect and record more complete crystal structure change data of the sample 10 during the loading of the confining pressure and the loading of the axial pressure under the triaxial test conditions. In addition, the collection and recording of the crystal structure change data of the sample by the scanning device is not limited to the above-mentioned loading of the confining pressure and the loading of the axial pressure process, and can also be collected when the sample 10 reaches the corresponding predetermined confining pressure data, the predetermined axial pressure data, and the predetermined pore pressure data, and can also be collected before the sample is loaded with the confining pressure and the axial pressure.

[0114] S34, controlling the second fluid filling device to work, so as to fill the pore fluid into the fluid inlet channel 701 of the container body 3, so that the fluid pressure acting on the sample 10 reaches the predetermined pore pressure data.

[0115] Thus, the second fluid filling device is controlled to work so as to fill the pore fluid into the fluid inlet channel 701 of the container body 3. The pore fluid flows upward along the fluid inlet channel 701 and enters the interior of the sample 10, and then enters the fluid discharge channel 702 through the seepage metal ring 77, the first support ring 79, the transfer pipeline 78, and the reflux port 703. During this process, the pressure of the fluid entering the sample 10 can be used as the pore pressure data of the sample 10. When the fluid pressure reaches the pore pressure data, the mechanical data of the sample 10 at this time is collected and recorded by the collection device, and the X-ray diffraction data of the sample 10 is collected by the scanning device.

[0116] Although the present invention is disclosed as above, the protection scope of the present invention is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. A triaxial experimental device based on in-situ X-ray analysis, applied to a test system, characterized in that: include: The container body (3) comprises an upper cover (4), an outer shell (5) and a triaxial pressure assembly, wherein the triaxial pressure assembly is arranged in the outer shell (5), and a mounting position for placing a sample (10) is provided on the top of the triaxial pressure assembly, and a first fluid filling device and a second fluid filling device of a test system are respectively connected to the triaxial pressure assembly to cooperate with the triaxial pressure assembly to perform a triaxial pressure test on the sample (10); the upper cover (4) is detachably connected to the top of the outer shell (5), and the upper cover (4) is provided with a slit (41); a scanning device for scanning and recording X-ray diffraction data of the sample (10) under triaxial pressure conditions is arranged above the container body (3); the scanning device comprises an emission source (8) for emitting X-rays to scan the sample (10) and a detector (9) for receiving X-rays transmitted through the sample (10); the slit (41) is used to allow the X-rays emitted by the emission source (8) to enter the container body and the X-rays diffracted by the sample (10) to be emitted from the container body to the detector (9); A mounting base, on which the container body (3) is arranged.

2. The triaxial experimental device based on in-situ X-ray analysis according to claim 1, characterized in that: The three-axis pressure assembly includes an axial pressure rod assembly (70) and a sleeve. The axial pressure rod assembly (70) is arranged in the outer shell (5) along the axial direction of the outer shell (5). The sleeve is sleeved on the top of the axial pressure rod assembly (70) and outside the sample (10). The sample (10) is located below the slit (41) of the upper cover (4).

3. The triaxial experimental device based on in-situ X-ray analysis according to claim 2 is characterized in that: The three-axis pressure assembly further comprises a first pressure head (71), a first support ring (79), a second support ring (80) and a positioning member (72); the housing (5) is provided with a first cavity and a second cavity which are arranged along its own axial direction and are interconnected; the first pressure head (71) is embedded in the second cavity; the top end of the axial pressure rod assembly (70) is passed through the first pressure head (71) and is located in the first cavity; the positioning member (72) is arranged at the top end of the axial pressure rod assembly (70) and between the outer wall of the sleeve and the inner wall of the housing (5); the first support ring (79) and the second support ring (80) are arranged in the first cavity and are respectively located on the upper and lower sides of the positioning member (72); the first pressure head (71) is provided with a first fluid flow channel (711) connected to the first cavity, and the positioning member (72) is a circular ring structure made of porous rubber. The first fluid filling device is connected to the first fluid flow channel (711) and is used to output the confining pressure fluid to flow through the first fluid flow channel (711), the first cavity and the positioning member (72) in sequence and act on the sleeve mounted outside the sample (10).

4. The triaxial experimental device based on in-situ X-ray analysis according to claim 3 is characterized in that: The three-axis pressure assembly also includes a limiting top plate (74), a third cavity is provided inside the first pressure head (71), an annular protrusion (75) is provided on the outer wall of the axial pressure rod assembly (70), the annular protrusion (75) is sealed with the circumferential side wall of the third cavity, and a fluid entry space is preset between the annular protrusion (75) and the inner bottom wall of the third cavity, the first pressure head (71) is also provided with a second fluid flow channel (712) connected to the fluid entry space, the limiting top plate (74) is arranged between the sample (10) and the upper cover (4), the first fluid filling device is connected to the second fluid flow channel (712), and is used to output the axial pressure fluid to flow through the second fluid flow channel (712) and the fluid entry space in sequence, so as to push the annular protrusion (75) to drive the axial pressure rod assembly (70) to move axially.

5. The triaxial experimental device based on in-situ X-ray analysis according to claim 4, characterized in that: The three-axis pressure assembly also includes a second pressure head (76). A fourth cavity is also provided inside the first pressure head (71), and the fourth cavity is located above the third cavity. The second pressure head (76) is arranged in the fourth cavity, and the second pressure head (76) is used to limit the axial displacement height of the annular protrusion (75).

6. The triaxial experimental device based on in-situ X-ray analysis according to claim 4, characterized in that: The triaxial pressure assembly also includes a seepage metal ring (77), a transfer pipeline (78) and a transmission top plate (73), wherein the transmission top plate (73) is arranged between the sample (10) and the limiting top plate (74), the first support ring (79) is provided with a sink and a gap flow channel, the seepage metal ring (77) is arranged in the sink, and the seepage metal ring (77) is sleeved outside the top of the sample (10); the interior of the axial pressure rod assembly (70) is provided with a fluid inlet flow channel (701) and a fluid outlet flow channel (702), and the axial pressure rod assembly (70) is also provided with a reflux port (703) at the first cavity, and the second fluid filling device is respectively in communication with the fluid inlet flow channel (701) and the fluid outlet flow channel (702). , used for inputting pore fluid into the fluid inlet channel (701) and receiving the pore fluid discharged from the fluid outlet channel (702), the transparent top plate (73) is arranged above the first support ring (79) and the seepage metal ring (77) and is in contact and connected with the first support ring (79) and the seepage metal ring (77), the first support ring (79) and the reflux port (703) are connected through the transfer pipeline (78), and the pore fluid of the fluid inlet channel (701) flows back to the fluid outlet channel (702) after passing through the sample (10), the seepage metal ring (77), the gap channel of the first support ring (79), the transfer pipeline (78), the reflux port (703) in sequence.

7. The triaxial experimental device based on in-situ X-ray analysis according to claim 2, characterized in that: It also includes a support seat (81), the sample (10) is arranged above the support seat (81), and the support seat (81) is arranged at the top end of the axial pressure rod assembly (70) for installing samples (10) of different sizes.

8. A testing system, characterized in that: It comprises a first fluid filling device, a second fluid filling device, a scanning device and the triaxial experimental device based on in-situ X-ray analysis as claimed in claim 6, and also comprises a collection device, wherein the collection device is connected to the triaxial experimental device based on in-situ X-ray analysis.

9. A testing method, based on the testing system according to claim 8, characterized in that: The steps include: Moving the three-axis experimental device of the test system to the scanning device, adjusting the height of the container body (3) in the three-axis experimental device so that the installation height of the sample (10) arranged in the container body (3) corresponds to the height of the original standard sample stage in the scanning device; The angular position of the container body (3) is adjusted so that the length direction of the slit (41) on the container body (3) is consistent with the arrangement direction of the emission source (8) and the detector (9), so that the X-rays emitted by the emission source (8) and the X-rays received by the detector (9) after diffraction by the sample (10) can both pass through the slit (41); Controlling the first fluid filling device to respectively fill the first fluid flow channel (711) and the second fluid flow channel (712) of the container body (3) with confining pressure fluid and axial pressure fluid, so that the sample (10) reaches predetermined confining pressure data and predetermined axial pressure data, and controlling the second fluid filling device to fill the pore fluid into the fluid inlet flow channel (701) of the container body (3), so that the sample (10) reaches predetermined pore pressure data; The flow rate of the confining pressure fluid or the axial pressure fluid is increased again, and the mechanical data of the sample (10) is recorded by a collection device; and X-ray diffraction data of the sample (10) under triaxial pressure conditions is collected by a scanning device; wherein the mechanical data includes current confining pressure data, current axial pressure data, displacement of the axial pressure rod assembly (70), and current pore pressure data corresponding to the sample (10) after the flow rate of the confining pressure fluid or the axial pressure fluid is increased again; The mechanical data and the X-ray diffraction data are saved, the confining pressure fluid, the axial pressure fluid and the pore fluid are unloaded, and a sample is taken out (10).

10. The testing method according to claim 9, characterized in that: The controlling of the first fluid filling device to fill the first fluid flow channel (711) and the second fluid flow channel (712) of the container body (3) with the confining pressure fluid and the axial pressure fluid respectively so that the sample (10) reaches the predetermined confining pressure data and the predetermined axial pressure data, and the controlling of the second fluid filling device to fill the pore fluid into the fluid inlet flow channel (701) of the container body (3) so that the sample (10) reaches the predetermined pore pressure data comprises: Controlling the operation of the first fluid filling device to fill the first cavity of the container body (3) with a confining pressure fluid through the first fluid flow channel (711) of the container body (3) and act on the sample (10) to load the confining pressure; Controlling the operation of the first fluid filling device to fill the fluid inlet space of the container body (3) with axial pressure fluid through the second fluid flow channel (712) of the container body (3) and act on the sample (10) to load the axial pressure; Loading the confining pressure to a predetermined confining pressure data according to a first preset flow rate, and loading the axial pressure to a predetermined axial pressure data according to a second preset flow rate; The second fluid filling device is controlled to work so as to fill the pore fluid into the fluid inlet channel (701) of the container body (3) so that the fluid pressure acting on the sample (10) reaches the predetermined pore pressure data.

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