CN219162018U

CN219162018U - Sample support

Info

Publication number: CN219162018U
Application number: CN202223578314.9U
Authority: CN
Inventors: 张林娟; 王建强; 于海生; 吴佳兴
Original assignee: Shanghai Institute of Applied Physics of CAS
Current assignee: Shanghai Institute of Applied Physics of CAS
Priority date: 2022-12-30
Filing date: 2022-12-30
Publication date: 2023-06-09
Anticipated expiration: 2032-12-30

Abstract

The utility model relates to a sample holder, which comprises an adapter plate, wherein a fixed plate is fixed on the adapter plate, a cover plate and a magnetic piece are arranged on the fixed plate, the magnetic piece adsorbs the cover plate on the fixed plate, and a sample is clamped between the magnetic piece and the cover plate; the magnetic part is provided with a first through hole, the cover plate is provided with a second through hole, the fixed plate is provided with a third through hole, and the adapter plate is provided with a fourth through hole. According to the sample holder, the sample is clamped between the magnetic piece and the cover plate, and the magnetic piece, the sample and the cover plate are fixed on the fixing plate through the attraction of the magnetic piece, so that the sample holder is convenient to install, and quick and accurate installation can be realized.

Description

Sample support

Technical Field

The utility model relates to the field of laboratory spectrometers, in particular to a sample holder for fixing a sample in a laboratory spectrometer.

Background

The X-ray absorption spectrum is an experimental technology which matures along with the development of a synchrotron radiation device, is one of important methods for researching a substance structure, can research an atomic neighbor local structure under various conditions such as solid state, liquid state and the like, and is widely applied to various fields such as materials, biology, chemistry, environment, geology and the like.

The laboratory spectrometer is an analysis instrument formed by utilizing components such as an X-ray source, a spherical bent crystal, a detector, a displacement table and the like based on the Roland circle imaging principle, and the X-ray source, the spherical bent crystal, the sample and the detector move on the Roland circle through the displacement table so as to realize absorption spectrum acquisition of different samples in the energy range corresponding to different Bragg angles, thereby measuring the adjacent local structure information (such as the types, valence states, bond lengths, coordination numbers and the like of coordination elements) of different elements.

In the prior art, a sample after grinding and pressing is adhered to an iron sheet with a rectangular hole by using an adhesive tape, and then the iron sheet and the sample are integrally fixed on an adapter plate.

However, the existing sample fixing structure adopts the tape-sticking mode, which is difficult to position, the sample is likely to be broken due to the fact that the sticking position is not ideal and the operation is repeated, and the sample is relatively time-consuming and labor-consuming to stick, and if the tape is covered in the through hole area of the iron sheet during the sticking, the sample absorption spectrum data acquisition result can be affected.

Disclosure of Invention

The utility model aims to provide a sample holder which is used for adsorbing and fixing a sample by magnetic force so as to realize quick positioning and mounting of the sample.

Based on the above object, the utility model provides a sample holder, comprising an adapter plate, wherein a fixed plate is fixed on the adapter plate, a cover plate and a magnetic piece are arranged on the fixed plate, the magnetic piece adsorbs the cover plate on the fixed plate, and a sample is clamped between the magnetic piece and the cover plate; the magnetic part is provided with a first through hole, the cover plate is provided with a second through hole, the fixed plate is provided with a third through hole, and the adapter plate is provided with a fourth through hole.

Further, a protrusion is arranged on one side, close to the cover plate, of the magnetic piece, and a containing groove is formed in the protrusion so as to contain the sample.

Further, a first groove is formed in one side, close to the magnetic piece, of the cover plate so as to accommodate the protrusion.

Further, a second groove is formed in one side, close to the cover plate, of the fixing plate so as to accommodate one side of the cover plate.

Further, the protrusion is in clearance fit with the first groove, and the cover plate is in clearance fit with the second groove.

Further, a plurality of screw holes are formed in the fixing plate, so that the fixing plate is connected with the adapter plate through screws.

Further, the magnetic piece is made by annealing an N35 neodymium magnet.

Further, the cover plate and the fixing plate are both made of iron.

According to the sample holder, the sample is clamped between the magnetic piece and the cover plate, and the magnetic piece, the sample and the cover plate are fixed on the fixed plate through the attraction of the magnetic piece, so that the sample holder is convenient to install, and can be installed rapidly and accurately; the positioning and fixing of the sample, the magnetic piece and the cover plate can be completed through the accommodating groove, the first groove, the second groove and the like, and the rapid and accurate positioning can be realized.

Drawings

FIG. 1 is a schematic view of a Roland circle of a laboratory spectrometer according to an embodiment of the utility model;

FIG. 2 is a schematic view of a sample holder according to an embodiment of the present utility model;

FIG. 3 is a cross-sectional view of a sample holder according to an embodiment of the present utility model;

FIG. 4A is a top view of a magnetic article according to an embodiment of the present utility model;

FIG. 4B is a cross-sectional view A-A of FIG. 4A;

FIG. 4C is an enlarged view of the portion I of FIG. 4B;

FIG. 5A is a top view of a cover plate according to an embodiment of the present utility model;

FIG. 5B is a B-B cross-sectional view of FIG. 5A;

FIG. 6A is a top view of a fixation plate according to an embodiment of the present utility model;

FIG. 6B is a C-C cross-sectional view of FIG. 6A;

fig. 6C is an enlarged view of section II of fig. 6B.

Detailed Description

Preferred embodiments of the present utility model will be described in detail with reference to the accompanying drawings.

The laboratory spectrometer comprises an X-ray source, a spherical bent crystal and a detector, wherein the X-ray source is fixed, and the spherical bent crystal, the sample and the detector are moved so that the X-ray source, the spherical bent crystal and the sample are always on the Roland circle. As shown in fig. 1, the light source point P of the X-ray source ₁ Geometric center P of spherical bent crystal ₂ And the geometric center P of the sample surface ₃ Always on the rowland circle with a diameter Rc, where Rc is the radius of curvature of the spherical curved crystal. Thus, an incident beam of light from the X-ray is monochromatized by spherical bending, transmitted to the sample and received by a subsequent detector. The included angle between the incident beam and the normal of the spherical bent crystal is the Bragg angle theta, and the energy used for scanning can be changed by changing the angle value. Light source point P ₁ And the geometric center P of spherical bent crystal ₂ The distance between them is P ₁ P ₂ =rc·sin θ, light source point P ₁ And the geometric center P of the sample surface ₃ The distance between them is P ₁ P ₃ =rc·sin θ cos θ. Since Rc is the radius of curvature of the spherical bent crystal, the size of the spherical bent crystal is determined after the spherical bent crystal is determined, and therefore, P ₁ P ₂ And P ₁ P ₃ The value of (2) is related to θ, and when θ changes, P ₁ P ₂ And P ₁ P ₃ The value of (2) also needs to be changed accordingly. In the utility model, θ=55° -82 °, spherical bending, sample and detector movement can be moved simultaneously to satisfy the above distance relationship at different θ values.

As shown in fig. 2 and 3, the sample holder 100 includes an adapter plate 10, a fixing plate 20 is disposed on the adapter plate 10, and is fixed on the adapter plate 10 by a plurality of m2.5x8 stainless steel hexagon socket head cap screws 60, a cover plate 30 and a magnetic member 40 are disposed on the fixing plate 20, the magnetic member 40 adsorbs the cover plate 30 on the fixing plate 20, and the sample 50 is sandwiched between the magnetic member 40 and the cover plate 30 and is fixed by the adsorption force of the magnetic member 40.

As shown in fig. 4A, 4B and 4C, the magnetic member 40 may have a stepped disc structure, on which a first through hole 41 is provided for X-rays to pass. The magnetic member 40 is provided with a protrusion 42 on a side close to the sample 50, and the protrusion 42 is provided with a receiving groove 43 having a diameter slightly larger than that of the sample 50 (for example, 1mm larger) to receive the sample 50 and position the sample 50.

As shown in fig. 5A and 5B, the cover plate 30 is provided with a second through hole 41 for passing X-rays. The cover plate 30 is provided with a first groove 32 on one side close to the magnetic member 40 for accommodating a protrusion 42 of the magnetic member 40 to fix and position the magnetic member 40 on the cover plate 30. The first recess 32 may be sized slightly larger than the projection 42 such that the projection 42 and the first recess 32 are a clearance fit.

As shown in fig. 6A, 6B and 6C, the fixing plate 20 is provided with a third through hole 21 for the X-rays to pass through. The fixing plate 20 is provided with a second groove 22 on one side near the cover plate 30 to accommodate one side of the cover plate 30 therein, thereby achieving positioning of the cover plate 30. The fixing plate 20 is provided with a plurality of screw holes 23, which are engaged with the screws 60, thereby fixing the fixing plate 20 to the adapter plate 10. The adapter plate 10 is provided with a fourth through hole (not shown in the figure) for X-rays to pass through.

Before installing a sample, the bottom end of the adapter plate 10 is fixed on the base of the laboratory spectrometer, the fixing plate 20 is fixed on the adapter plate 10 through the screw 60, when installing the sample, the sample 50 is firstly placed in the accommodating groove 43 on the protrusion 42 of the magnetic piece 40, then the protrusion 42 of the magnetic piece 40 is placed in the first groove 32 of the cover plate 30, the magnetic piece 40 is fixed with the cover plate 30, the sample 30 is clamped between the magnetic piece 40 and the cover plate 30, then one side, far away from the magnetic piece 40, of the cover plate 30 is placed in the second groove 22 of the fixing plate 20, and the cover plate 30 is fixed on the fixing plate 20 under the suction effect of the magnetic piece 40, so that the installation of the sample 50 is completed. The positioning and fixing of the sample 50, the magnetic piece 40 and the cover plate 20 are completed through the accommodating groove 43, the first groove 32, the second groove 22 and the like, the installation is simple and convenient, the rapid and accurate installation of the sample 50 can be realized, and the disassembly is simpler and more convenient through magnetic force absorption. When the sample 50 needs to be replaced, the magnetic element 40, the cover plate 30 and the sample 50 are detached from the fixing plate 20, then the magnetic element 40 is detached from the cover plate 30, the sample 50 is taken out, and the installation process is repeated after a new sample is replaced. When mounted, the sample 50 is positioned right in front of a detector (not shown) of the laboratory spectrometer, such that X-rays can be irradiated onto the sample 50 through the first through hole 41, transmitted from the sample 50, sequentially passed through the second through hole 31, the third through hole 21 and the fourth through hole, and then reach the detector to be received by the detector.

In one exemplary embodiment, the sample 50 has a diameter of 13mm and a thickness of 0.2mm; the diameter d1=24 mm of the magnetic member 40, the diameter of the first through hole 41 is 10mm, the thickness is 2mm, the diameter of the projection 42 is 20mm, the thickness is 0.5mm, the diameter of the receiving groove 43 is 14mm, and the thickness is 0.2mm±0.05mm; the cover plate 30 has a diameter d2=24 mm, the second through hole 31 has a diameter d3=10 mm, a thickness of 1.5mm, the first groove 32 has a thickness of 0.45mm, and a diameter of 20mm; the third through hole 21 of the fixing piece 20 is a rectangular hole having a size of 3mm×9mm, and the second groove 22 has a diameter of 24mm and a thickness of 0.5mm to be clearance-fitted with the cap plate 30. The fixing piece 20 comprises a first circular arc section 24, a first straight line section 25, a second circular arc section 26 and a second straight line section 27 which are connected end to end, wherein the diameters of the first circular arc section 24 and the second circular arc section 26 are 37.8mm, and the included angle between the first straight line section 25 and the second straight line section 27 is 42.6 degrees.

The magnetic member 40 may be made of an N35 neodymium magnet, which must be annealed after finishing the processing to weaken its magnetic properties (thermally induced demagnetization); the magnetic member 40 was baked for about 1 hour in an environment above the curie temperature (310 c) of the material N35 neodymium magnet. The magnetic member 40 can be removed more conveniently after being demagnetized at high temperature. The cover plate 30 and the fixing plate 20 are made of iron to be adsorbed to the magnetic member 40. The magnetic member 40, the cover plate 30 and the fixing plate 20 are all subjected to rust-preventing treatment.

According to the sample holder disclosed by the embodiment of the utility model, the sample 50 is clamped between the magnetic piece 40 and the cover plate 30, and the magnetic piece 40, the sample 50 and the cover plate 30 are fixed on the fixed plate 20 through the attraction of the magnetic piece 40, so that the sample holder is convenient to install, and quick and accurate installation can be realized; the positioning and fixing of the sample 50, the magnetic member 40, the cover plate 20 are accomplished by the accommodation groove 43, the first groove 32, the second groove 22, etc., and rapid and accurate positioning can be achieved.

The foregoing description is only a preferred embodiment of the present utility model, and is not intended to limit the scope of the present utility model, and various modifications can be made to the above-described embodiment of the present utility model. All simple, equivalent changes and modifications made in accordance with the claims and the specification of this application fall within the scope of the patent claims. The present utility model is not described in detail in the conventional art.

Claims

1. The sample holder is characterized by comprising an adapter plate, wherein a fixed plate is fixed on the adapter plate, a cover plate and a magnetic piece are arranged on the fixed plate, the magnetic piece adsorbs the cover plate on the fixed plate, and a sample is clamped between the magnetic piece and the cover plate; the magnetic part is provided with a first through hole, the cover plate is provided with a second through hole, the fixed plate is provided with a third through hole, and the adapter plate is provided with a fourth through hole.

2. The sample holder according to claim 1, wherein a protrusion is provided on a side of the magnetic member adjacent to the cover plate, and a receiving groove is provided on the protrusion to receive the sample.

3. The sample holder of claim 2, wherein a first recess is formed in a side of the cover plate adjacent to the magnetic member to accommodate the protrusion.

4. A sample holder according to claim 3, wherein the side of the fixing plate adjacent to the cover plate is provided with a second recess for receiving one side of the cover plate.

5. The sample holder of claim 4, wherein the protrusion is in clearance fit with the first recess and the cover plate is in clearance fit with the second recess.

6. The sample holder according to claim 1, wherein the fixing plate is provided with a plurality of screw holes so that the fixing plate is connected to the adapter plate by screws.

7. The sample holder of claim 1, wherein the magnetic member is formed by annealing an N35 neodymium magnet.

8. The sample holder of claim 1, wherein the cover plate and the fixing plate are each made of iron.