CN219162021U - Positioning and clamping assembly - Google Patents
Positioning and clamping assembly Download PDFInfo
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- CN219162021U CN219162021U CN202223583472.3U CN202223583472U CN219162021U CN 219162021 U CN219162021 U CN 219162021U CN 202223583472 U CN202223583472 U CN 202223583472U CN 219162021 U CN219162021 U CN 219162021U
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Abstract
The utility model relates to a positioning clamping assembly, which comprises a base and a normal positioning device, wherein the normal positioning device comprises a positioning plate, the positioning plate is fixed on the base, a plurality of buckles arranged along the circumferential direction are arranged on the positioning plate, spherical bent crystals are fixed on the positioning plate by the buckles, and scales are arranged on the positioning plate. According to the positioning and clamping assembly, the spherical bent crystal can be fixed on the positioning plate through the buckle, and the normal vector of the lattice diffraction surface of the spherical bent crystal can be positioned through the scale on the positioning plate.
Description
Technical Field
The utility model relates to the technical field of laboratory spectrometers, in particular to a positioning and clamping assembly for fixing spherical bent crystals of 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 order to obtain high-quality experimental data, the installation height of the geometric center of the spherical bent crystal is required to be as high as possible to be positioned at the same height as the light source point of the ray source, the center of the sample and the center of the detector. Because of a certain processing error in the processing process of the spherical bent crystal, a certain included angle exists between the normal vector of the lattice diffraction surface of the surface coating and the normal vector of the spherical geometric center of the spherical bent crystal, and the angle is called a chamfer angle (generally within 0.5 degrees). When the X-ray source and the spherical bent crystal scan the sample, the normal vector of the lattice diffraction surface of the spherical bent crystal needs to be positioned in the plane of the Roland circle to obtain higher diffraction efficiency.
However, the conventional fixing device for spherical bent crystals cannot position the normal vector of the lattice diffraction surface.
Disclosure of Invention
The utility model aims to provide a positioning and clamping assembly which is used for fixing spherical bent crystals and positioning normal vectors of lattice diffraction surfaces of the spherical bent crystals.
Based on the above object, the utility model provides a positioning and clamping assembly, which comprises a base and a normal positioning device, wherein the normal positioning device comprises a positioning plate, the positioning plate is fixed on the base, a plurality of buckles arranged along the circumferential direction are arranged on the positioning plate, spherical bent crystals are fixed on the positioning plate by the buckles, and scales are arranged on the positioning plate.
Further, the buckle includes buckle base and cardboard, the buckle base with locating plate fixed connection, the cardboard with form the draw-in groove between the buckle base, in the draw-in groove was gone into to the curved brilliant card of sphere, the cardboard compresses tightly the curved brilliant of sphere.
Further, an elastic pad is arranged on the clamping plate, so that the clamping plate is in contact with the spherical bent crystal through the elastic pad.
Further, the elastic pad is adhesive tape, rubber or sponge.
Further, two shaft shoulder screws used for highly positioning the spherical bent crystal are arranged on the positioning plate, and the bottom end of the spherical bent crystal is contacted with the two shaft shoulder screws.
Further, a holding part is arranged on the positioning plate.
Further, the base comprises a switching disc, a bottom plate and a side plate, wherein the bottom plate is fixed on the switching disc, the side plate is fixed on the bottom plate, and the positioning plate is fixed on the side plate.
Further, two shaft shoulder screws used for positioning the height of the positioning plate are arranged on the side plate, and the bottom end surface of the positioning plate is in contact with the two shaft shoulder screws.
Further, a lateral positioning block is arranged on the side plate, two positioning pins are arranged on the adapter plate, and the lateral positioning block and the two positioning pins jointly position the central axis of the spherical bent crystal.
Further, the unit of the scale is 10 °.
According to the positioning and clamping assembly, the spherical bent crystal can be fixed on the positioning plate through the buckle, and the normal vector of the lattice diffraction surface of the spherical bent crystal can be positioned through the scale on the positioning plate.
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 positioning and clamping assembly according to an embodiment of the utility model;
FIG. 3 is a schematic view of a base according to an embodiment of the present utility model;
FIG. 4 is a cross-sectional view of a base according to an embodiment of the present utility model;
FIG. 5 is a schematic view of a normal positioning device according to an embodiment of the present utility model;
FIG. 6 is a schematic view of a buckle according to an embodiment of the present utility model;
fig. 7 is a rear schematic view of a positioning clamp assembly according to an embodiment of the utility model.
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. The utility modelIn the 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, an embodiment of the present utility model provides a positioning and clamping assembly for positioning a spherical bent crystal of a laboratory spectrometer, which includes a normal positioning device 10 and a base 20, wherein the normal positioning device 10 is fixed on the base 20, and the spherical bent crystal 30 is fixed on the normal positioning device 10.
As shown in fig. 3, the base 20 includes a turntable 21, a bottom plate 22, and side plates 23, the bottom plate 22 being fixed to the turntable 21 by a plurality of M4x12 hexagon socket head cap screws 24; as shown in fig. 4, the side plate 23 is fixed to the bottom plate 22 by two M6x10 hexagon socket head cap screws 25, and the normal positioning device 10 is fixed to the side plate 23, and the turntable 21 is used to connect to a rotary displacement table (not shown) so as to rotate the spherical bent crystal 30 by the rotary displacement table.
Two shoulder screws 29 of the type GDSMSB8-25-F12-M6 are provided on the side plate 23 for locating the height of the normal locating device 10. When installed, the bottom of the normal locating device 10 is placed on the two shoulder screws 29, thus defining the height of the normal locating device 10. The side plate 23 can be further provided with a lateral positioning block 26 which is fixed on the side plate 23 through two M4x8 hexagon socket head cap screws 27, the turntable 21 is provided with two phi 4x25 positioning pins 28, and the lateral positioning block 26 and the positioning pins 28 are jointly used for positioning the spherical bent crystal 30 so that the central axis of the spherical bent crystal 30 coincides with the central axis of the turntable 21. Specifically, the mounting positions of the two positioning pins 28 and the lateral positioning block 26 relative to the central axis of the turntable 21 are ensured by precision machining, and after machining, the normal positioning device 10 is simultaneously leaned against the inner side of the lateral positioning block 26 and the side surfaces of the two positioning pins 28 when being mounted, so that the central axis of the spherical bent crystal 30 is coincident with the central axis of the turntable 21.
As shown in fig. 5, the normal positioning device 10 includes a positioning plate 11, a plurality of fasteners 12 arranged along the circumferential direction are arranged on the positioning plate 11, the fasteners 12 are fixed with the positioning plate 11 by hexagonal countersunk head screws 15 in M6x16, and spherical bent crystals 30 are fixed on the positioning plate 11 by the fasteners 12.
As shown in fig. 6, the buckle 12 includes a buckle base 121 and a clamping plate 122, a clamping groove 123 is formed between the clamping plate 122 and the buckle base 121, and when the buckle is fixed, the spherical bent crystal 30 is partially clamped into the clamping groove 123 and is pressed by the clamping plate 122 to limit the movement of the spherical bent crystal 30, when the spherical bent crystal 30 is fixed by a plurality of buckles 12, the spherical bent crystal 30 cannot move, if the buckle needs to move, the screw 15 can be loosened, so that the buckle 12 does not press the spherical bent crystal 30 any more, and at this time, the spherical bent crystal 30 can rotate on the positioning plate 11. An elastic pad 124, such as an adhesive tape, sponge, rubber or other elastic material, may be disposed on the bottom surface of the clamping plate 122, and the elastic pad 124 contacts the spherical bent crystal 30 to relieve the pressure of the clamping plate 122 on the spherical bent crystal 30.
The positioning plate 11 may be provided with a scale, for example, the scale may be 10 ° with the topmost end being 0, and then 10 ° and 20 ° … ° are marked sequentially in the clockwise direction, so as to determine the rotation angle of the spherical curved crystal 30, and facilitate the subsequent positioning of the normal vector of the lattice diffraction plane of the spherical curved crystal 30.
Two shoulder screws 13 with the model of GDMSB6-16-F9.5-M5 can be arranged on the positioning plate 11 and used for positioning the geometric center height of the spherical bent crystal 30. When the spherical bent crystal 30 is installed, the bottom of the spherical bent crystal 30 is contacted with the two shoulder screws 13, and the geometric center height of the spherical bent crystal 30 can be determined.
The positioning plate 11 may also be provided with a grip portion 14 for easy taking.
As shown in fig. 7, the positioning plate 11 may be fixed to the side plate 23 by three flat head knurled screws 16.
The following will describe the positioning step of the normal vector of the lattice diffraction plane of the spherical bent crystal 30:
s1: after the positioning and clamping assembly is assembled, the adapter plate 21 of the positioning and clamping assembly is fixed on a rotary displacement table;
s2: marking a marking line at a position of the spherical bent crystal 30 corresponding to the scale mark 0 on the positioning plate 11;
s3: the rotary displacement table drives the spherical bent crystal 30 to rotate by +/-1 DEG, and the maximum light intensity count of the detector in the angle range is recorded;
s4: loosening the screw 15, rotating the spherical bent crystal 30 to enable the marked line on the spherical bent crystal 30 to be aligned with the 10-degree marked line on the positioning plate 11, and driving the spherical bent crystal 30 to rotate by +/-1 degree by the rotary displacement table, wherein the maximum light intensity count of the detector in the angle range is recorded, namely the maximum light intensity count under the 10-degree marked line;
s5: and sequentially rotating the spherical bent crystal 30 to obtain the maximum light intensity counts under different scribing lines, wherein the scribing line position corresponding to the maximum light intensity count is the position of the normal vector of the lattice diffraction surface in the Roland circle plane, and the positioning of the normal vector of the lattice diffraction surface can be completed by rotating the spherical bent crystal 30 until the scribing line is aligned to the scribing line.
According to the positioning and clamping assembly provided by the embodiment of the utility model, the spherical bent crystal can be fixed on the positioning plate through the buckle, and the normal vector of the lattice diffraction surface of the spherical bent crystal can be positioned through the scale on the positioning plate.
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 (10)
1. The utility model provides a location centre gripping subassembly, its characterized in that includes base and normal positioner, normal positioner includes the locating plate, the locating plate is fixed on the base, be equipped with a plurality of buckles along circumference range on the locating plate, the buckle is fixed spherical curved crystal on the locating plate, be provided with the scale on the locating plate.
2. The positioning and clamping assembly according to claim 1, wherein the buckle comprises a buckle base and a clamping plate, the buckle base is fixedly connected with the positioning plate, a clamping groove is formed between the clamping plate and the buckle base, the spherical bent crystal is clamped into the clamping groove, and the clamping plate compresses the spherical bent crystal.
3. The positioning and clamping assembly according to claim 2, wherein an elastic pad is provided on the clamping plate to contact the spherical bent crystal through the elastic pad.
4. A positioning clamp assembly according to claim 3 wherein the resilient pad is tape, rubber or sponge.
5. The positioning and clamping assembly according to claim 1, wherein two shoulder screws for positioning the spherical bent crystal at a high height are arranged on the positioning plate, and the bottom end of the spherical bent crystal is in contact with the two shoulder screws.
6. The positioning and clamping assembly of claim 1, wherein the positioning plate is provided with a grip.
7. The positioning clamp assembly of claim 1, wherein the base includes a turntable, a bottom plate and a side plate, the bottom plate being secured to the turntable, the side plate being secured to the bottom plate, the positioning plate being secured to the side plate.
8. The positioning and clamping assembly according to claim 7, wherein two shoulder screws for positioning the height of the positioning plate are arranged on the side plate, and the bottom end surface of the positioning plate is in contact with the two shoulder screws.
9. The positioning and clamping assembly according to claim 7, wherein a lateral positioning block is arranged on the side plate, two positioning pins are arranged on the adapter plate, and the lateral positioning block and the two positioning pins jointly position the central axis of the spherical bent crystal.
10. The positioning clamp assembly of claim 1 wherein the scale is in units of 10 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223583472.3U CN219162021U (en) | 2022-12-30 | 2022-12-30 | Positioning and clamping assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223583472.3U CN219162021U (en) | 2022-12-30 | 2022-12-30 | Positioning and clamping assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219162021U true CN219162021U (en) | 2023-06-09 |
Family
ID=86616631
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223583472.3U Active CN219162021U (en) | 2022-12-30 | 2022-12-30 | Positioning and clamping assembly |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219162021U (en) |
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- 2022-12-30 CN CN202223583472.3U patent/CN219162021U/en active Active
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