A positioning and mounting assembly for spherical bent crystals

Abstract

This invention relates to a positioning and mounting assembly for a spherical curved crystal, comprising a positioning plate assembly and a base. The spherical curved crystal has a front and a back side connected by side connections. The front side has a narrow annular edge. The positioning plate assembly includes a positioning plate mounted on the base and a positioning element fixedly mounted on the positioning plate. The narrow annular edge of the spherical curved crystal is positioned against the positioning plate, and the side of the spherical curved crystal is supported on the positioning element for positioning to determine the geometric center height of the spherical curved crystal. According to the positioning and mounting assembly of the spherical curved crystal of this invention, positioning and mounting are performed using the front side, which has higher machining precision, and the structure of the positioning and mounting assembly is simplified, making it easier and faster to position and mount the spherical curved crystal into a laboratory spectrometer.

Description

Technical Field

[0001] This invention relates to laboratory spectrometers, and more specifically to a positioning and mounting assembly for a spherical curved crystal. Background Technology

[0002] Laboratory spectrometers are analytical instruments based on the Loland circle imaging principle, utilizing components such as X-ray sources, spherical curved crystals, detectors, and high-precision displacement stages. They can measure the local structural information of neighboring elements (such as the type, valence state, bond length, and coordination number of coordinating elements). The spherical curved crystal is used to receive X-rays emitted from the X-ray source, monochromate them, and focus them onto the sample.

[0003] CN202223583472.3 discloses a spherical curved crystal positioning and mounting assembly, the main disadvantages of which are: 1) Using the back side of the spherical curved crystal for positioning and mounting, since the crystal is processed by grinding the glass substrate into the required disk-shaped spherical shape, its back side is usually a slightly convex arc surface, so using its back side for positioning and mounting will introduce additional surface shape errors; 2) The geometric center height of the spherical curved crystal mounted on the electric turntable is determined by two sets of shoulder screws, which may introduce additional positioning errors; 3) The positioning of the geometric center of the spherical curved crystal and the rotation center axis of the electric turntable is achieved by relying on the positioning pin, which requires high processing accuracy in the size and position of the positioning pin hole and the outer diameter of the positioning pin. Summary of the Invention

[0004] To address the positioning errors and other issues in the prior art, this invention provides a positioning and mounting assembly for spherical bent crystals.

[0005] The positioning and mounting assembly for a spherical curved crystal according to the present invention includes a positioning plate assembly and a base, wherein the spherical curved crystal has a front and a back connected by a side, and the edge of the front has an annular narrow edge. The positioning plate assembly includes a positioning plate mounted on the base and a positioning element fixedly mounted on the positioning plate. The annular narrow edge of the spherical curved crystal is positioned against the positioning plate, and the side of the spherical curved crystal is positioned on the positioning element to determine the geometric center height of the spherical curved crystal.

[0006] Preferably, the positioning plate has a through hole, and the annular narrow edge surrounds the through hole and contacts the back of the positioning plate to achieve positioning. Incident X-rays pass through the through hole and hit the front of the spherical curved crystal.

[0007] Preferably, the positioning element is a set of shoulder screws extending perpendicularly to the positioning plate.

[0008] Preferably, the side of the spherical bent crystal is placed on the cylindrical surface of the shoulder screw.

[0009] Preferably, the back of the positioning plate has etched lines as reference lines, and the etched lines on the side of the spherical curved crystal are aligned with the etched lines so that the lattice plane normal vector of the spherical curved crystal is placed in the Rowland circle plane.

[0010] Preferably, the positioning plate assembly further includes clamping fingers fixedly mounted on the positioning plate, the clamping fingers pressing against the back of the spherical curved crystal to complete the fixation of the spherical curved crystal.

[0011] Preferably, the material for holding the finger is polytetrafluoroethylene or polyimide.

[0012] Preferably, the base has a rear step surface and a side step surface, the back of the positioning plate abuts against the rear step surface for positioning, and the side of the positioning plate abuts against the side step surface for positioning.

[0013] Preferably, the positioning plate has a rectangular step extending forward on its front side, and a first stepped countersunk hole is opened on the rectangular step. A second stepped countersunk hole is opened on the base. Fasteners pass through the first stepped countersunk hole and into the second stepped countersunk hole to complete the connection between the positioning plate assembly and the base.

[0014] Preferably, the base has a threaded hole through which a screw connects the base to the motorized turntable of the laboratory spectrometer.

[0015] The positioning and mounting assembly for the spherical bent crystal according to the present invention uses the front side of the spherical bent crystal with higher processing precision for positioning and mounting, and simplifies the structure of the positioning and mounting assembly, so that the spherical bent crystal can be more conveniently and quickly positioned and mounted into the laboratory spectrometer. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of a positioning and mounting assembly according to a preferred embodiment of the present invention, wherein a spherical curved crystal is mounted on the positioning and mounting assembly.

[0017] Figure 2 yes Figure 1 Rear view.

[0018] Figure 3 yes Figure 1 A schematic diagram of the structure of a spherical bent crystal.

[0019] Figure 4 yes Figure 1 A schematic diagram of the positioning plate.

[0020] Figure 5 yes Figure 4 Rear view.

[0021] Figure 6 yes Figure 1 A schematic diagram of the base structure. Detailed Implementation

[0022] To enable those skilled in the art to better understand the present invention, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of the invention.

[0023] like Figures 1-2 As shown, the spherical curved crystal 1 is installed by a positioning and mounting assembly A according to a preferred embodiment of the present invention. The positioning and mounting assembly A includes a positioning plate assembly 100 and a base 6, wherein the spherical curved crystal 1 is mounted on the positioning plate assembly 100, the positioning plate assembly 100 is mounted on the base 6, and the base 6 is mounted on the electric turntable (not shown) of the laboratory spectrometer.

[0024] like Figure 3 As shown, the spherical curved crystal 1 has a front side 1a and a back side 1b connected by a side surface 12, and the front side 1a has an annular narrow edge 11 at its edge. Compared to the back side 1b, the annular narrow edge 11 has better flatness. The spherical curved crystal 1 of the present invention is positioned and installed by the annular narrow edge 11 and the side surface 12, avoiding the additional surface shape error introduced by using the back side for positioning.

[0025] Back Figure 1 The positioning plate assembly 100 includes a positioning plate 2, shoulder screws 3, and clamping fingers 4. Two shoulder screws 3 are fixedly mounted on the positioning plate 2 below the spherical curved crystal 1, and four clamping fingers 4 are fixedly mounted on the positioning plate 2 around the spherical curved crystal 1.

[0026] like Figure 4 As shown, a circular through hole 13 is opened in the middle of the positioning plate 2, and the annular narrow edge 11 of the front side 1a of the spherical curved crystal 1 surrounds the circular through hole 13 and the back side 10 of the positioning plate 2 (see Figure 10). Figure 2 ( ) Contact achieves positioning, and incident X-rays can reach the front surface 1a of the spherical curved crystal 1 through the circular through-hole 13, such as Figure 2 As shown.

[0027] like Figure 5 As shown, the upper part of the back surface 10 of the positioning plate 2 has a etched line 9 serving as a reference line, such as... Figure 2 As shown, when the spherical curved crystal 1 is mounted on the positioning plate 2, aligning the scribing line 8 and the engraving line 9 on its side 12 will place the lattice plane normal vector of the spherical curved crystal 1 within the Rowland circle plane, thereby obtaining better diffraction efficiency during energy spectrum acquisition. Here, the lattice plane normal vector refers to the direction pointed to by the normal vector of the lattice diffraction plane in the coating on the spherical curved crystal substrate.

[0028] like Figure 5 As shown, the positioning plate 2 also has four screw holes 14 evenly distributed around the circular through hole 13, such as... Figure 2As shown, four L-shaped clamping fingers 4 are inserted into screw holes 14 via screws 5 to press against the back surface 1b of the spherical curved crystal 1, thereby completing the fixation of the spherical curved crystal 1. The clamping fingers 4 here can be made of materials with a certain degree of toughness, such as polytetrafluoroethylene or polyimide, to reduce the compressive stress and deformation on the back surface 1b of the spherical curved crystal 1 after clamping.

[0029] like Figure 5 As shown, the positioning plate 2 also has two screw holes 15 located below the circular through hole 13, such as... Figure 2 As shown, a set of shoulder screws 3 are installed onto the positioning plate 2 via screw holes 15 to position the geometric center height of the spherical bent crystal 1. During installation, the side surface 12 of the spherical bent crystal 1 (see...) Figure 3 ) placed on the cylindrical surface 16 of the two shoulder screws 3 (see Figure 2 On the spherical curved crystal 1, by attaching the annular narrow edge 11 of the front side 1a of the spherical curved crystal 1 to the back side 10 of the positioning plate 2 and aligning the drawn line 8 and engraved line 9 of the side side 12 of the spherical curved crystal 1, the geometric center height of the spherical curved crystal 1 after installation can be determined, and its lattice plane normal vector is placed in the Rowland circle plane. Compared with the prior art, which requires two sets of shoulder screws to determine the geometric center height, the present invention avoids introducing additional positioning errors.

[0030] like Figure 4 As shown, the front of the positioning plate 2 extends forward with a rectangular step 17, on which two stepped countersunk holes 18 are opened.

[0031] like Figure 6 As shown, the base 6 has a rear stepped surface 20 and a side stepped surface 21, see [reference]. Figure 2 The back 10 of the positioning plate 2 abuts against the rear step surface 20 for positioning, and the side 19 of the positioning plate 2 (see...) Figure 4 Position it against the side step surface 21.

[0032] like Figure 6 As shown, the base 6 has two stepped countersunk holes 22, see [reference]. Figure 1 Two screws 24 pass through stepped countersunk holes 18 on the rectangular step 17 of the positioning plate 2 (see...). Figure 4 Insert the stepped countersunk hole 22 to complete the connection between the positioning plate assembly 100 and the base 6, and also complete the assembly of the entire positioning and mounting assembly A.

[0033] like Figure 6 As shown, the base 6 also has a threaded hole 23 and a screw 7 (see Figure 1). Figure 2 The base 6 can be connected to the electric turntable (not shown) through the threaded hole 23, thereby completing the positioning and installation of the spherical curved crystal 1 in the laboratory spectrometer.

[0034] After the spherical bent crystal 1 is positioned and installed on the positioning plate 2, the positioning of the positioning plate 2 on the base 6 ensures that, after the positioning and mounting assembly A is connected to the electric turntable, the geometric center of the spherical bent crystal 1 can coincide as much as possible with the axis of the rotation center of the electric turntable. Compared with the prior art, which requires positioning pins to coincide the geometric center and the rotation center of the electric turntable, the spherical bent crystal 1 of the present invention is positioned by relying on two stepped surfaces 20 and 21. The machining accuracy requirements of the stepped surfaces are relatively low, thus reducing the positioning error introduced by machining errors.

[0035] The spherical curved crystal positioning and mounting assembly provided by this invention has been described in detail above. The composition of each part of the device and their installation position relationships have been explained in this document. The above description is only for the purpose of helping to understand the method and core idea of ​​this invention. It should be noted that those skilled in the art can make several improvements and modifications to this invention without departing from the principle of this invention, and these improvements and modifications also fall within the protection scope of the claims of this invention.

Claims

1. A positioning and mounting assembly for a spherical bent crystal, characterized in that, The positioning and mounting assembly includes a positioning plate assembly and a base. The spherical curved crystal has a front and a back side connected by its sides. The front side has a narrow annular edge. The positioning plate assembly includes a positioning plate mounted on the base and a positioning element fixedly mounted on the positioning plate. The narrow annular edge of the spherical curved crystal fits against the positioning plate for positioning. The side of the spherical curved crystal is supported on the positioning element for positioning to determine the geometric center height of the spherical curved crystal. The positioning plate has a through hole. The narrow annular edge surrounds the through hole and contacts the back side of the positioning plate to achieve positioning. Incident X-rays pass through the through hole to hit the front side of the spherical curved crystal. The positioning plate assembly also includes a clamping finger fixedly mounted on the positioning plate. The clamping finger presses against the back side of the spherical curved crystal to complete the fixation of the spherical curved crystal.

2. The positioning and installation component according to claim 1, characterized in that, The positioning element is a set of shoulder screws that extend perpendicularly to the positioning plate.

3. The positioning and installation component according to claim 2, characterized in that, The side of the spherical bent crystal rests on the cylindrical surface of the shoulder screw.

4. The positioning and installation component according to claim 1, characterized in that, The back of the positioning plate has etched lines that serve as reference lines. The lines on the side of the spherical curved crystal are aligned with the etched lines so that the normal vector of the lattice plane of the spherical curved crystal is placed in the Rowland circle plane.

5. The positioning and installation component according to claim 1, characterized in that, The material used to hold the fingers is polytetrafluoroethylene or polyimide.

6. The positioning and installation component according to claim 1, characterized in that, The base has a rear stepped surface and a side stepped surface. The back of the positioning plate abuts against the rear stepped surface for positioning, and the side of the positioning plate abuts against the side stepped surface for positioning.

7. The positioning and installation component according to claim 1, characterized in that, The positioning plate has a rectangular step extending forward on its front side. A first-step countersunk hole is opened on the rectangular step, and a second-step countersunk hole is opened on the base. Fasteners pass through the first-step countersunk hole and into the second-step countersunk hole to complete the connection between the positioning plate assembly and the base.

8. The positioning and installation component according to claim 1, characterized in that, The base has a threaded hole through which screws connect the base to the motorized turntable of the laboratory spectrometer.

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