A XRD powder sample preparation device

Abstract

The utility model discloses an XRD powder sample preparation device, which relates to the field of material detection technology, including a base, a sample preparation cabin and a first elastic member, wherein a vibrating member is provided on the base, and the upper end of the sample preparation cabin is set as an opening; a vibrating screen assembly, which is detachably connected to the top of the sample preparation cabin; a sample rack and a clamping assembly, wherein a receiving slot and a channel are provided on one side of the sample rack, one end of the channel is connected to the receiving slot, and the other end extends to the edge of the sample rack, the sample rack is installed in the clamping assembly so that the opening of the receiving slot is blocked, the clamping assembly is longitudinally detachably connected to the sample preparation cabin so that the output end of the vibrating screen assembly extends to be located in the channel, the receiving slot is used to collect the powder to be tested after screening, and when the receiving slot is collected, the clamping assembly is disconnected from the sample preparation cabin, and the channel is blocked by the blocking member. The above-mentioned XRD powder sample preparation device solves the technical problem of errors in manual sample preparation and achieves the technical effect of the XRD powder sample preparation device.

Description

Technical Field

[0001] The utility model relates to the technical field of material detection, in particular to an XRD powder sample preparation device. Background Art

[0002] With the continuous development of science and technology, XRD (X-ray diffraction) technology, as an important means of material characterization, has been widely used in materials, energy, physics, chemical industry, minerals, life sciences and other fields. XRD technology can accurately determine the crystal structure of materials, especially for quantitatively obtaining the microstructural parameters of materials, it is very important to obtain the XRD spectrum that reflects the structural characteristics of materials. However, the accuracy and reliability of XRD test results depend to a large extent on the sample preparation process.

[0003] In XRD testing, powder samples are the most common sample form. Traditional powder sample preparation methods, such as manual sample preparation and tableting, are simple and easy, but have many disadvantages. Because the sample is manually taken, the height of the sample on the metal round plate die is different, resulting in different densities of the pressed sample in the horizontal direction, which in turn leads to systematic differences in XRD test data, thus affecting the accuracy of the test results. In addition, the manual sample preparation process is complicated and costly, which is not conducive to its promotion in practical applications.

[0004] Therefore, how to provide an XRD powder sample preparation device to avoid errors caused by human factors and improve the accuracy and reliability of XRD testing is a technical problem that those skilled in the art currently need to solve. Utility Model Content

[0005] The utility model aims to provide an XRD powder sample preparation device, which solves the technical problems of human error in manual sample preparation and inaccurate XRD test data.

[0006] In order to achieve the above object, the utility model provides an XRD powder sample preparation device, comprising:

[0007] A base, a sample preparation cabin and a first elastic member, wherein the sample preparation cabin is arranged on the top of the base through the first elastic member, a vibrating member is arranged on the base, and an upper end of the sample preparation cabin is arranged as an opening;

[0008] A vibrating screen assembly, detachably connected to the top of the sample preparation cabin;

[0009] The sample rack and the clamping assembly are provided with a receiving groove and a channel on one side of the sample rack. One end of the channel is connected to the receiving groove, and the other end extends to the edge of the sample rack. The sample rack is installed in the clamping assembly to seal the opening of the receiving groove. The clamping assembly is longitudinally detachably connected to the sample preparation cabin so that the output end of the vibration screen assembly extends to be located in the channel. The receiving groove is used to collect the powder to be tested after screening. When the receiving groove completes the collection, the clamping assembly is disconnected from the sample preparation cabin, and the channel is sealed by the sealing member.

[0010] Preferably, the vibrating screen assembly includes a sieve body and a hanger. The sieve body is a funnel-shaped sieve body with a sieve installed inside. The hanger is arranged on the outer peripheral surface of the sieve body so that the sieve body can be detachably connected to the top of the sample preparation cabin. An output pipe is provided at the bottom of the sieve body, and the output pipe can be extended to the channel.

[0011] Preferably, the hanger is an annular groove with an opening at the bottom end, which is fixed to the outer peripheral surface of the top end of the sieve body. The outer diameter of the annular groove is larger than the outer diameter of the sample preparation chamber, and the outer diameter of the sieve body is smaller than the inner diameter of the sample preparation chamber. The annular groove can be embedded in the upper end of the sample preparation chamber.

[0012] Preferably, the sample holder is an annular member, and the receiving groove is a blind hole arranged at the center of the upper end surface of the sample holder.

[0013] Preferably, the clamping assembly includes a clamping seat and a clamping plate. The clamping seat is provided with a penetrating installation groove, the sample rack is arranged in the installation groove, the bottom end of the clamping plate is set as a frosted surface, and the bottom end of the clamping plate is tightly fitted on the top of the sample rack through a connecting module.

[0014] Preferably, the connecting module includes a locking bolt and a second elastic member, and the upper end of the clamping seat is provided with a plurality of threaded holes connected to the mounting grooves, and each locking bolt corresponds to the threaded hole so that the tail end of the locking bolt abuts against the top of the clamping plate, one end of the second elastic member is connected to the clamping seat, and the other end is connected to the top of the clamping plate, and the second elastic member is sleeved on the locking bolt.

[0015] Preferably, a fixing rod is provided at the bottom of the sample preparation cabin, and a clamping assembly is provided with an installation channel. The clamping assembly passes through the fixing rod through the installation channel so that the clamping assembly is connected to the sample preparation cabin, thereby realizing a vertical upward arrangement of the channel in the sample preparation cabin.

[0016] Preferably, the sample preparation cabin is provided with an observation window, and the pressing seat and the sample rack are both transparent parts.

[0017] Preferably, clamping pieces are provided at both ends of the blocking piece, and the clamping pieces abut against the inner wall of the channel so that the blocking piece can seal the channel.

[0018] Preferably, the height of the blocking piece is equal to the depth of the channel, and the length of the blocking piece is equal to the width of the channel.

[0019] Compared with the above-mentioned background technology, the sample preparation cabin provided by the utility model is connected to the base through a first elastic member, and a vibrating member is provided on the base, which provides necessary power for the screening of powder samples by generating vibration. A receiving slot and a channel are provided on one side of the sample rack, one end of the channel is connected to the receiving slot, and the other end extends to the edge of the sample rack. The sieved powder can smoothly enter the receiving slot through the channel, thereby realizing sample collection. In order to ensure the stability and accuracy of the screening process, the sample rack is installed in a clamping assembly. The clamping assembly is longitudinally and detachably connected to the sample preparation cabin, so that the output end of the vibrating screen assembly can accurately extend into the channel. When the vibrating screen assembly is working, the sieved powder can enter the receiving slot through the channel. After working for a certain period of time, when the holding tank is full of powder, the clamping assembly can be disconnected from the sample preparation cabin. At this time, the channel is blocked by a plugging piece to prevent leakage and contamination of the powder. Next, the clamping assembly is placed flat on the test bench to disconnect the clamping assembly from the sample rack, and then the prepared sample is subjected to XRD testing. The tight fixation of the clamping assembly and the sample rack of the present application effectively avoids the height error that may be caused in the manual sample preparation process. At the same time, the sample height of the present application is consistent, and the problem of preferential orientation that may be caused in the manual sample preparation process can be avoided during the vibration sample preparation process. In addition, the screening and sample preparation in the sample preparation process are integrated, which greatly simplifies the cumbersome steps and the use of materials in the sample preparation process. In summary, the present application provides a kind of XRD powder sample preparation device, which avoids errors caused by human factors, improves the accuracy and reliability of XRD testing, simplifies the sample preparation steps, and reduces the sample preparation cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0021] Figure 1 A schematic diagram of the structure of an XRD powder sample preparation device provided in an embodiment of the utility model;

[0022] Figure 2 A schematic diagram of the connection of the sample preparation cabin provided in the embodiment of the utility model;

[0023] Figure 3 A top view of the sample preparation cabin structure provided by an embodiment of the utility model;

[0024] Figure 4 A front view of a vibrating screen assembly provided by an embodiment of the utility model;

[0025] Figure 5 A top view of a vibrating screen assembly provided by an embodiment of the utility model;

[0026] Figure 6 A front view of a sample rack provided by an embodiment of the utility model;

[0027] Figure 7 A top view of a sample holder provided by an embodiment of the utility model;

[0028] Figure 8 A schematic diagram of the structure of the blocking member provided in the embodiment of the utility model;

[0029] Fig. 9 A schematic diagram of the cooperation between the blocking member and the sample rack provided in the embodiment of the utility model;

[0030] Fig.10 A schematic diagram of the cooperation between the compression assembly and the sample rack provided in an embodiment of the utility model;

[0031] Fig.11 for Fig.10 A top view of

[0032] Fig.12 This is a test data diagram of Example 1 of the present application;

[0033] Fig.13 This is a test data diagram for comparative example.

[0034] in:

[0035] 1-base, 2-sample preparation chamber, 3-first elastic member, 4-vibrating screen assembly, 5-sample rack, 6-pressing assembly, 7-blocking member;

[0036] 11- vibrating element;

[0037] 21-fixing rod, 22-observation window;

[0038] 41-screen body, 42-hanging part, 43-screen, 44-output pipe;

[0039] 51-accommodating groove, 52-channel;

[0040] 61-pressing seat, 62-pressing plate, 63-locking bolt, 64-second elastic member, 65-installation channel;

[0041] 71- Clamping piece. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0043] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0044] See also Figure 1 , Figure 6-Figure 9 The present application provides an XRD powder sample preparation device, comprising: a base 1, a sample preparation chamber 2 and a first elastic member 3, wherein the sample preparation chamber 2 is arranged on the top of the base 1 through the first elastic member 3, a vibrating member 11 is arranged on the base 1, and the upper end of the sample preparation chamber 2 is arranged to be open;

[0045] A vibrating screen assembly 4 is detachably connected to the top of the sample preparation chamber 2; a sample rack 5 and a pressing assembly 6, a receiving groove 51 and a channel 52 are provided on one side of the sample rack 5, one end of the channel 52 is connected to the receiving groove 51, and the other end extends to the edge of the sample rack 5, the sample rack 5 is installed in the pressing assembly 6 to seal the opening of the receiving groove 51, the pressing assembly 6 is longitudinally detachably connected to the sample preparation chamber 2, so that the output end of the vibrating screen assembly 4 extends to the channel 52, the receiving groove 51 is used to collect the powder to be tested after screening, when the receiving groove 51 completes the collection, the pressing assembly 6 is disconnected from the sample preparation chamber 2, and the channel 52 is sealed by the blocking member 7.

[0046] That is to say, the sample preparation cabin 2 is connected to the base 1 through the first elastic member 3. This design enables the sample preparation cabin 2 to maintain a stable motion state when vibrated. The base 1 is provided with a vibrating member 11, which provides the necessary power for the screening of the powder sample by generating vibration. The top of the sample preparation cabin 2 is provided with an opening, which is convenient for the vibration screen assembly 4 to be connected to the top of the sample preparation cabin 2 in a detachable manner. One side of the sample rack 5 is provided with a receiving groove 51 and a channel 52. One end of the channel 52 is connected to the receiving groove 51, and the other end extends to the edge of the sample rack 5. The powder after screening can smoothly enter the receiving groove 51 through the channel 52, and the sample collection is realized. In order to ensure the stability and accuracy of the screening process, the sample rack 5 is installed in the clamping assembly 6. The clamping assembly 6 is longitudinally detachably connected to the sample preparation cabin 2, so that the output end of the vibration screen assembly 4 can accurately extend into the channel 52. When the vibration screen assembly 4 is working, the screened powder can enter the receiving groove 51 through the channel 52. After working for a certain period of time, when the receiving tank 51 is full of powder, the clamping assembly 6 can be disconnected from the sample preparation chamber 2. At this time, the channel 52 is blocked by the blocking member 7 to prevent leakage and contamination of the powder. Next, the clamping assembly 6 is placed flat on the test bench to disconnect the clamping assembly 6 from the sample holder 5, and then the prepared sample is subjected to XRD test. The tight fixation of the clamping assembly 6 and the sample holder 5 of the present application effectively avoids the height error that may be caused in the manual sample preparation process. At the same time, the sample height of the present application is consistent, and the problem of preferential orientation that may be caused in the manual sample preparation process can be avoided during the vibration sample preparation process. In addition, the screening and sample preparation in the sample preparation process are integrated, which greatly simplifies the cumbersome steps and the use of materials in the sample preparation process. In summary, the present application provides an XRD powder sample preparation device that avoids errors caused by human factors, improves the accuracy and reliability of XRD testing, simplifies the sample preparation steps, and reduces the sample preparation cost.

[0047] See also Figure 4 and Figure 5 The vibrating screen assembly 4 provided in the present application includes a screen body 41 and a hanging part 42. The screen body 41 is a funnel-shaped screen body, and a screen mesh 43 is installed in the screen body 41. The hanging part 42 is arranged on the outer peripheral surface of the screen body 41, so that the screen body 41 can be detachably connected to the top of the sample preparation cabin 2. The bottom of the screen body 41 is provided with an output pipe 44, and the output pipe 44 can extend to be located in the channel 52. The hanging part 42 is an annular groove with an opening at the bottom end, and the annular groove is fixedly arranged on the outer peripheral surface of the top end of the screen body 41. The outer diameter of the annular groove is larger than the outer diameter of the sample preparation cabin 2, and the outer diameter of the screen body 41 is smaller than the inner diameter of the sample preparation cabin 2. The annular groove can be embedded in the upper end of the sample preparation cabin 2.

[0048] That is to say, the vibrating screen assembly 4 includes a screen body 41 and a hanging part 42. First, the screen body 41 adopts a funnel-shaped design, which is not only convenient for the entry and aggregation of powder, but also can effectively improve the screening efficiency. Inside the screen body 41, a fine screen 43 is installed, which can effectively separate the particles in the powder according to size, thereby ensuring the purity and consistency of the final sample. The hanging part 42 is a connecting piece between the screen body 41 and the sample preparation cabin 2. It is designed as an annular groove with an opening at the bottom, and this structure enables the hanging part 42 to be firmly embedded in the upper end of the sample preparation cabin 2. The outer diameter of the annular groove is larger than the outer diameter of the sample preparation cabin 2, while the outer diameter of the screen body 41 is smaller than the inner diameter of the sample preparation cabin 2. Such a design not only ensures that the screen body 41 can be stably installed on the sample preparation cabin 2, but also makes the disassembly process simple and convenient. When the vibrating screen assembly 4 is installed on the sample preparation cabin 2, the output pipe 44 provided at the bottom of the screen body 41 will accurately extend into the channel 52. In this way, when the sieve body 41 performs sieving under the action of vibration, the sieved powder can smoothly enter the channel 52 through the output pipe 44 and finally be collected in the containing tank 51 .

[0049] Specifically, the first elastic member 3 is a vibration spring, which plays a supporting role as well as a telescopic role.

[0050] Specifically, the mesh size of the sieve 43 is 200 mesh or 300 mesh, preferably 200 mesh.

[0051] See also Figure 6-Figure 7 The sample rack 5 is an annular member, the receiving groove 51 is a blind hole arranged at the center of the upper end surface of the sample rack 5, the receiving groove 51 and the channel 52 are both arranged at the upper end of the sample rack 5, and the depths of the receiving groove 51 and the channel 52 are both less than the thickness of the sample rack 5.

[0052] See also Figure 8-Figure 9 , clamping members 71 are provided at both ends of the blocking member 7, and the clamping members 71 are elastic sheets. The clamping members 71 abut against the inner wall of the channel 52 to achieve the blocking member 7 sealing the channel 52. The height of the blocking member 7 is equal to the depth of the channel 52, and the length of the blocking member 7 is equal to the width of the channel 52.

[0053] That is, the two ends of the plugging member 7 are provided with clamping members 71, which are elastic sheets, so that the clamping members 71 can flexibly adapt to the shape and size of the inner wall of the channel 52. When the plugging member 7 is placed in the channel 52, the clamping members 71 will be tightly abutted against the inner wall of the channel 52 to form an effective sealing structure, which can ensure that powder will not leak out of the channel 52.

[0054] The height of the blocking member 7 is set to be equal to the depth of the channel 52, so that the blocking member 7 can be fully inserted into the channel 52 to achieve a complete blocking effect. At the same time, the length of the blocking member 7 is also set to be equal to the width of the channel 52, so that the blocking member 7 can fit tightly on both sides of the channel 52, further enhancing its sealing performance.

[0055] See also Figure 10-11 The clamping assembly 6 includes a clamping seat 61 and a clamping plate 62. The clamping seat 61 is provided with a penetrating installation groove. The sample rack 5 is arranged in the installation groove. The bottom end of the clamping plate 62 is set to a frosted surface. The bottom end of the clamping plate 62 is tightly fitted on the top of the sample rack 5 through the connecting module. The connecting module includes a locking bolt 63 and a second elastic member 64. The upper end of the clamping seat 61 is provided with a plurality of threaded holes connected to the installation groove. Each locking bolt 63 corresponds to the threaded hole so that the tail end of the locking bolt 63 abuts against the top of the clamping plate 62. One end of the second elastic member 64 is connected to the clamping seat 61, and the other end is connected to the top of the clamping plate 62. The second elastic member 64 is sleeved on the locking bolt 63, and the second elastic member 64 is a spring.

[0056] That is to say, a through mounting groove is provided inside the pressing seat 61 , and the width of the mounting groove is equal to the outer diameter of the sample holder 5 , so that the sample holder 5 can be stably placed in the mounting groove.

[0057] The bottom end of the pressing plate 62 is designed with a frosted surface, which improves the fit between the pressing plate 62 and the top of the sample holder 5. The rough surface of the frosted surface increases the friction, so that the pressing plate 62 can be more tightly and firmly pressed against the sample holder 5, preventing the sample from being displaced or loosened during the vibration screening process, and avoiding the height error and preferential orientation caused by the manual sample preparation process.

[0058] In order to ensure a tight fit between the clamping plate 62 and the sample holder 5, the upper end of the clamping seat 61 is provided with a plurality of threaded holes connected to the mounting grooves, and each locking bolt 63 is matched with a corresponding threaded hole. When the locking bolt 63 is tightened, its tail end will generate abutment force with the top of the clamping plate 62, thereby pushing the clamping plate 62 to move downward to achieve compression of the sample holder 5. At the same time, one end of the second elastic member 64 is connected to the clamping seat 61, and the other end is connected to the top of the clamping plate 62. After the sample preparation is completed, the locking bolt 63 is loosened, and the clamping plate 62 automatically rebounds through the second elastic member 64 to avoid scraping the sample to cause height error and preferential orientation.

[0059] See also Figure 1 , Figure 3 and Fig.10A fixing rod 21 is provided at the bottom of the sample preparation chamber 2, and the fixing rod 21 is made of metal. The clamping assembly 6 is provided with an installation channel 65, and the installation channel 65 is a gap formed by the clamping seat 61, the clamping plate 62 and the locking bolt 63. The clamping assembly 6 passes through the fixing rod 21 through the installation channel 65 so that the clamping assembly 6 is connected to the sample preparation chamber 2, so that the channel 52 is vertically upwardly arranged in the sample preparation chamber 2.

[0060] That is to say, a fixing rod 21 is arranged at the bottom of the sample preparation chamber 2 to provide a stable support for the installation of the clamping assembly 6. The installation channel 65 is actually a gap formed by the clamping seat 61, the clamping plate 62 and the locking bolt 63 to ensure that the fixing rod 21 can pass through it smoothly. When the clamping assembly 6 passes through the fixing rod 21 through the installation channel 65, the clamping assembly 6 is firmly connected to the sample preparation chamber 2. At the same time, since the clamping assembly 6 and the sample rack 5 are placed longitudinally in the sample preparation chamber 2, the channel 52 can be arranged vertically upward in the sample preparation chamber 2, thereby ensuring the smooth progress of the screening and collection process.

[0061] See also Figure 2 The sample preparation cabin 2 is provided with an observation window 22, and the material of the observation window 22 is a transparent material such as PMMA, PVC, and a transparent resin. The material of the sample holder 5 is a transparent material such as organic glass. The material of the pressing plate 62 can be glass, organic glass, etc., the front side is a smooth surface, and the back side needs to be a frosted surface, and the frosted surface is opposite to the surface of the receiving groove 51. The material of the pressing seat is a transparent material such as PMMA, PVC, and a transparent resin. The pressing seat 61 and the sample holder 5 are both transparent parts. This facilitates real-time observation of the sample preparation powder collection situation of the receiving groove in the sample preparation cabin.

[0062] That is to say, the sample preparation cabin 2 provides the user with the convenience of observing the sample preparation process in real time by designing the observation window 22 and selecting the pressing seat 61 and the sample rack 5 made of transparent material.

[0063] Embodiment 1:

[0064] Step 1: Place the sample holder 5 in the mounting groove of the clamping seat 61, make the frosted surface of the clamping plate 62 fit the receiving groove 51 of the sample holder 5, and tighten the locking bolt 63 to form a Fig.10 As shown;

[0065] Step 2: Place the clamping assembly 6 assembled in step 1 in the sample preparation chamber 2, with the opening of the channel 52 facing upward, and then pass the fixing rod 21 through the installation channel 65 to fix the clamping assembly 6 and the sample rack 5 in the sample preparation chamber 2;

[0066] Step 3: hang the vibrating screen assembly 4 on the top of the sample preparation chamber 2, and extend the output pipe 44 to be located in the channel 52;

[0067] Step 4: Connect the vibration element 11 to a power source and start vibration;

[0068] Step 5: Take a certain amount of LATP powder and put it in the sieve 43. After the LATP powder is separated by the sieve 43, it enters the receiving slot 51 of the sample rack 5 through the output pipe 44 and the channel 52;

[0069] Step 6: Observe through the observation window 22 that the sample holding tank 51 has been filled with LATP powder, and turn off the power of the vibration element 11;

[0070] Step 7: Take out the clamping assembly 6, seal the channel 52 with the sealing member 7, and then place the clamping assembly 6 flat on the workbench; loosen the locking bolt 63, the clamping plate 62 automatically rebounds upward, take out the sample holder 5, and perform XRD testing.

[0071] Step 8. Set the X-ray diffractometer test parameters as follows:

[0072] Step 9: Use X-ray diffractometer to test. The test results are as follows: Fig.12 As shown:

[0073] from Fig.12 It can be seen that the LATP powder XRD data corresponds to the peak position and relative peak intensity of PDF card 35-0754.

[0074] Comparative Example:

[0075] Step 1: Take a certain amount of LATP powder and place it on the sieve. Place filter paper or other containers under the sieve in advance and shake it manually to pass through the sieve.

[0076] Step 2: Pour the sieved LATP powder into the sample holder and scrape off the excess sample on the surface with the frosted surface of the frosted glass.

[0077] Step 3: Test using an X-ray diffractometer. The test parameters are the same as those in Example 1. The test results are as follows: Fig.13 As shown:

[0078] from Fig.13 It can be seen that the LATP powder XRD data corresponds to the peak position of PDF card 35-0754, but the relative peak intensities are inconsistent, indicating a preferred orientation.

[0079] By comparing the XRD spectra of Example 1 with those of Comparative Example 1, it is shown that the use of the XRD sample preparation device makes the sample preparation method simpler, reduces the influence of human factors, reduces the sample preparation cost, avoids the occurrence of preferential orientation and peak position shift, and thus makes the XRD data of the sample to be tested more accurate.

[0080] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0081] This article uses specific examples to illustrate the principle and implementation of an XRD powder sample preparation device provided by the utility model. The description of the above examples is only used to help understand the method and core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. An XRD powder sample preparation device, characterized in that: include: A base (1), a sample preparation chamber (2) and a first elastic member (3), wherein the sample preparation chamber (2) is arranged on the top of the base (1) via the first elastic member (3), a vibrating member (11) is provided on the base (1), and the upper end of the sample preparation chamber (2) is arranged to be open; A vibrating screen assembly (4) detachably connected to the top of the sample preparation chamber (2); A sample rack (5) and a pressing assembly (6), wherein a receiving groove (51) and a channel (52) are provided on one side of the sample rack (5), wherein one end of the channel (52) is connected to the receiving groove (51) and the other end extends to the edge of the sample rack (5), wherein the sample rack (5) is installed in the pressing assembly (6) so that the opening of the receiving groove (51) is blocked, and the pressing assembly (6) is longitudinally detachably connected to the sample preparation chamber (2) so that the output end of the vibration screen assembly (4) extends to be located in the channel (52), wherein the receiving groove (51) is used to collect the powder to be tested after screening, and when the collecting in the receiving groove (51) is completed, the pressing assembly (6) is disconnected from the sample preparation chamber (2), and the channel (52) is blocked by a blocking member (7).

2. The XRD powder sample preparation device according to claim 1, characterized in that: The vibrating screen assembly (4) comprises a screen body (41) and a hanging part (42); the screen body (41) is a funnel-shaped screen body, a screen (43) is installed in the screen body (41), the hanging part (42) is arranged on the outer peripheral surface of the screen body (41), so that the screen body (41) can be detachably connected to the top of the sample preparation chamber (2); an output pipe (44) is arranged at the bottom of the screen body (41), and the output pipe (44) can extend to be located in the channel (52).

3. The XRD powder sample preparation device according to claim 2, characterized in that: The hanging part (42) is an annular groove with an opening at the bottom end. The annular groove is fixedly arranged on the outer peripheral surface of the top end of the sieve body (41). The outer diameter of the annular groove is larger than the outer diameter of the sample preparation chamber (2). The outer diameter of the sieve body (41) is smaller than the inner diameter of the sample preparation chamber (2). The annular groove can be snap-fitted into the upper end of the sample preparation chamber (2).

4. The XRD powder sample preparation device according to claim 1, characterized in that: The sample rack (5) is an annular member, and the accommodating groove (51) is a blind hole arranged at the center of the upper end surface of the sample rack (5).

5. The XRD powder sample preparation device according to claim 1, characterized in that: The clamping assembly (6) comprises a clamping seat (61) and a clamping plate (62); a through-going mounting groove is provided in the clamping seat (61); the sample rack (5) is arranged in the mounting groove; the bottom end of the clamping plate (62) is provided with a frosted surface; the bottom end of the clamping plate (62) is tightly fitted on the top of the sample rack (5) via a connecting module.

6. The XRD powder sample preparation device according to claim 5, characterized in that: The connection module comprises a locking bolt (63) and a second elastic member (64); the upper end of the clamping seat (61) is provided with a plurality of threaded holes connected to the mounting groove; each of the locking bolts (63) corresponds to the threaded hole so that the tail end of the locking bolt (63) abuts against the top of the clamping plate (62); one end of the second elastic member (64) is connected to the clamping seat (61), and the other end is connected to the top of the clamping plate (62); and the second elastic member (64) is sleeved on the locking bolt (63).

7. The XRD powder sample preparation device according to claim 6, characterized in that: A fixing rod (21) is provided at the bottom of the sample preparation chamber (2), and the clamping assembly (6) is provided with a mounting channel (65). The clamping assembly (6) passes through the fixing rod (21) through the mounting channel (65) so that the clamping assembly (6) is connected to the sample preparation chamber (2), thereby realizing that the channel (52) is arranged vertically upward in the sample preparation chamber (2).

8. The XRD powder sample preparation device according to claim 5, characterized in that: The sample preparation chamber (2) is provided with an observation window (22), and the pressing seat (61) and the sample rack (5) are both transparent parts.

9. The XRD powder sample preparation device according to claim 1, characterized in that: Clamping pieces (71) are provided at both ends of the blocking piece (7), and the clamping pieces (71) abut against the inner wall of the channel (52) so that the blocking piece (7) seals the channel (52).

10. The XRD powder sample preparation device according to claim 9, characterized in that: The height of the blocking member (7) is equal to the depth of the channel (52), and the length of the blocking member (7) is equal to the width of the channel (52).

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