CN111812133B - Monochromator capable of adjusting focusing radius - Google Patents

Abstract

The invention provides a monochromator capable of adjusting a focusing radius, which comprises a box body for placing a reflector plate, a frame, a first driving assembly and a second driving assembly, wherein the first driving assembly is arranged on the box body; the box body is of a long strip-shaped structure, a reflector plate is arranged on the front side of the box body, and the box body is tightly pressed through a limiting piece; the two ends of the box body are rotationally connected with the frame; two ends of the box body are respectively provided with a through hole along the width direction, a pressing tongue rotationally connected with the box body is arranged in the through hole, and the rotating axis of the pressing tongue is parallel to the width direction of the box body; the box bodies are multiple and are sequentially arranged along the width direction of the box bodies; the first driving assembly is simultaneously in driving connection with the pressing tongue on each box body, can drive the pressing tongue to rotate, and enables the reflecting sheet to be bent forwards under the matching action of the limiting pieces; the box body is provided with a turnover connecting piece, the second driving assembly is in driving connection with the turnover connecting pieces on each box body simultaneously, and the box bodies are driven to rotate. The monochromator has reasonable structural design, convenient adjustment, high adjustment precision and obviously improved applicability.

Description

A Monochromator with Adjustable Focusing Radius

technical field

The invention belongs to the technical field of neutron scattering experiments, in particular to a monochromator and a bracket with adjustable focusing radius.

Background technique

Neutrons have strong penetrating ability, magnetic moment and no charge. As a research technique, neutron scattering has been involved in the research fields of physics, chemistry, chemical industry, biology, geology and mineral science, and materials science, such as determination of unknown structure, determination of atomic occupancy and thermal shock parameters, dynamics of sample structure over time Measurement, magnetic order and magnetic phase transition research, structure determination under special environment (low temperature, high temperature, high pressure, magnetic field) conditions, etc.

The neutrons produced by the reactor are white light neutrons with a continuous wavelength. According to Bragg's law, neutrons with specific wavelengths in the white light neutron beam emitted by the reactor can be selected by single crystal diffraction technology to meet the needs of neutron scattering experiments. The neutron beam intensity at the sample is a key technical indicator that directly affects the performance of the spectrometer. By using a focusing monochromator to converge the monochromatic neutron beam, the neutron flux at the sample of the neutron scattering spectrometer can be doubled. . The focusing monochromator is equipped with multiple single crystals, and by synergistically changing the vertical inclination and horizontal curvature of all single crystals, the neutrons of a specific wavelength satisfying Bragg's law can be focused at the sample. This technique is widely used in neutron powder diffraction, stress, single crystal and triaxial isospectrometer setups.

However, the current neutron-focusing monochromator still has many shortcomings technically. For example, the focusing parameters of the fixed monochromator are fixed and cannot be adjusted. The manual monochromator is inconvenient to adjust and requires more manual operations, or The structural design is unreasonable and the adjustment accuracy is not high.

Contents of the invention

In order to solve the above technical problems, the present invention provides a monochromator with adjustable focus radius. The monochromator has a reasonable structural design, is not only convenient to adjust but also has high adjustment accuracy, and its applicability is significantly improved.

The object of the invention of the present invention is achieved through the following technical solutions, a monochromator with an adjustable focus radius, including a box body, a frame, a first drive assembly and a second drive assembly for placing a reflector; the box body is a long A bar-shaped structure, the front side of which is provided with a limiting member and a mounting position for placing the reflective sheet, and the reflective sheet is placed in the mounting position and pressed by the limiting member installed on the front side of the box body; The two ends of the box body are rotatably connected with the frame, and the rotation axis is parallel to the length direction of the box body; two ends of the box body are respectively provided with a through hole along the width direction, and the through hole is provided with a The tongue that is rotatably connected to the box body has a rotation axis parallel to the width direction of the box body; the number of the box bodies is multiple, and they are arranged in sequence along the width direction; the first drive assembly is connected to each The depressing tongue on the box body is driven and connected at the same time, and the depressing tongue can be driven to rotate, and the reflective sheet is bent forward under the cooperation of the stopper; the box body is provided with an overturn connection The second drive assembly is simultaneously driven and connected to the flip connector on each of the boxes to drive the boxes to rotate.

On the basis of the above technical solutions, the present invention can also be further improved as follows.

Further, the end of the depressing tongue close to the middle part of the box body is rotatably connected with the box body, and a top block is provided on the front side of the end away from the middle part of the box body, and the top block can abut against the reflective sheet ;

The limiter includes two pressure heads, and the two pressure heads are respectively arranged on both sides of the middle part of the box body;

The two jacking blocks are closer to both ends of the box body in the length direction than the two pressing heads.

Further, the top block is movably connected to the depressing tongue, and an adjusting screw is provided on the back side of the depressing tongue, and the protruding distance of the top block can be adjusted by turning the adjusting screw.

Further, the back side of the depressing tongue is provided with a pressure-bearing member in the shape of an arcuate convex structure;

The first drive assembly includes two rotating shafts mounted on the frame, the rotating shafts are eccentric, and the cylindrical surfaces of the rotating shafts abut against the pressure bearing member.

Further, both ends of the rotating shaft are respectively connected to the frame in rotation, and a first reset hole is provided on the end surface of one end at a non-rotating axis position, and a second reset hole matching the first reset hole is provided at a corresponding position on the frame. An insertion hole, by inserting a first pin shaft adapted to the first reset hole and the first insertion hole, it can be determined that the rotation shaft is in an initial position.

Further, the first driving assembly further includes a first driving motor installed on the frame, the first driving motor is provided with two power output ends, and is synchronously connected to the two rotating shafts.

Further, the flip connector includes contacts, which are arranged on the back side of the box;

The second driving assembly includes a helical shaft, and the helical shaft is provided with forward and reverse thread grooves, and the contacts of each of the boxes are sequentially inserted into the thread grooves.

Further, the two ends of the spiral shaft are respectively connected to the frame in rotation, and a second reset hole is provided on the end surface of one end at the non-rotational axis position, and a second reset hole matching the second reset hole is provided at a corresponding position on the frame. Two insertion holes, by inserting a second pin shaft adapted to the second reset hole and the second insertion hole, it can be determined that the screw shaft is in an initial position.

Further, the second drive assembly further includes a second drive motor mounted on the frame, and the second drive motor is in transmission connection with the screw shaft.

Further, it is characterized in that the frame includes two side plates, and the two side plates are respectively arranged on both sides in the length direction of the box body;

The inner sides of the two side plates are provided with slide grooves;

Both sides of the box body are respectively provided with a slider, and the sliders are rotatably connected with the box body and are connected with the chute at the same time.

Through the above-mentioned technical solution provided by the present invention, a neutron monochromatization vertical focusing device for neutron diffraction spectrometer is provided, through a long box body, the reflector can be placed in, and then through the first The driving assembly and the second driving assembly can simultaneously adjust the curvature of the reflective sheet placed in the box in both horizontal and vertical directions, thereby achieving the purpose of focusing the monochromatic neutron beam, and the beam spot is very uniform. The whole device has simple structure, reasonable layout, convenient adjustment and high efficiency, and can realize automatic control adjustment.

Description of drawings

Fig. 1 is the three-dimensional structure schematic diagram of the specific embodiment of the monochromator of a kind of adjustable focusing radius provided by the present invention;

Fig. 2 is another perspective perspective structural schematic diagram of the embodiment shown in Fig. 1;

Fig. 3 is a schematic structural view of a specific embodiment of the box body;

Fig. 4 is a schematic diagram of a disassembled structure of a specific embodiment of the box body;

Fig. 5 is a schematic diagram of a disassembled structure of another angle of the box body;

Fig. 6 is a schematic diagram of the disassembled structure of some parts of a specific embodiment of a monochromator with adjustable focus radius provided by the present invention;

Fig. 7 is a schematic diagram of a disassembled structure from another angle shown in Fig. 6;

Fig. 8 is a schematic diagram of installation of the box body and the side panels;

Fig. 9 is a schematic structural diagram of a monochromator with adjustable focusing radius provided by the present invention. Among them, the part number in the figure is expressed as:

1. Box body, 2. Frame, 3. Limiting piece, 4. Reflector, 5. Through hole, 6. Depressing tongue, 7. Flip connector, 8. Top block, 9. Pressure head, 10. Adjusting screw , 11, pressure bearing, 12, rotating shaft, 13, the first reset hole, 14, the first insertion hole, 15, the first pin shaft, 16, the first drive motor, 17, the contact, 18, the screw shaft, 19, thread groove, 20, second reset hole, 21, second insertion hole, 22, second pin shaft, 23, second drive motor, 24, side plate, 25, chute, 26, slide block, 27, Box rotating shaft, 28, top plate, 29, base plate.

Detailed ways

The present invention will be described in detail below with reference to the accompanying drawings and examples. The principles and features of the present invention are described below in conjunction with the accompanying drawings. It should be noted that the accompanying drawings are only schematic diagrams provided for explaining the present invention, rather than real physical projection drawings; The embodiments and the features in the embodiments can be combined with each other. The examples given are only for explaining the present invention, not for limiting the scope of the present invention.

Please refer to Figures 1 to 9, Figure 1 is a schematic diagram of the three-dimensional structure of a specific embodiment of a monochromator with adjustable focusing radius provided by the present invention; Figure 2 is a schematic diagram of the three-dimensional structure of the embodiment shown in Figure 1 at another angle ; Fig. 3 is a schematic structural diagram of a specific embodiment of the box; Fig. 4 is a schematic diagram of a disassembled structure of a specific embodiment of the box; Fig. 5 is a disassembly of another angle of the box Fig. 6 is a schematic diagram of the dismantled structure of some parts of a specific embodiment of a monochromator with adjustable focus radius provided by the present invention; Fig. 7 is a schematic diagram of the disassembled structure of another angle shown in Fig. 6 ; FIG. 8 is a schematic diagram of the installation of the box and the side plate; FIG. 9 is a schematic structural diagram of a monochromator with adjustable focusing radius provided by the present invention.

In a specific embodiment of a monochromator with adjustable focus radius provided by the present invention, it includes a box body 1 for placing a reflective sheet 4, a frame 2, a first drive assembly and a second drive assembly; the reflective sheet 4 can be It's a silicon wafer.

In order to facilitate adjustment, the box body 1 is a strip-shaped structure, and its front side is provided with a stopper 3 and a mounting position for placing the reflective sheet 4. After the reflective sheet 4 is placed in the mounting position, it is installed on the The limiting member 3 on the front side of the box body 1 is pressed tightly; the two ends of the box body 1 are rotationally connected with the frame 2, and the rotation axis 12 is parallel to the length direction of the box body 1; the box body 1 Two ends of the body 1 are respectively provided with a through hole 5 along the width direction, and the through hole 5 is provided with a depressing tongue 6 which is rotatably connected with the box body 1, and its rotation axis 12 is parallel to the width direction of the box body 1 The number of said boxes 1 is multiple, in this embodiment it is 9, and the number can be set freely according to needs, and arranged in sequence along its width direction; said first drive assembly and each said box body 1 The depressing tongue 6 is driven and connected at the same time, which can drive the depressing tongue 6 to rotate, and under the cooperation of the stopper 3, the reflective sheet 4 is bent forward; the box body 1 is provided with Turn over the connecting piece 7, the second driving assembly is simultaneously drivingly connected with the turning over connecting piece 7 on each of the box bodies 1, and drives the box body 1 to rotate.

In the embodiment shown in the accompanying drawings, a plurality of box bodies 1 are arranged horizontally, and are neatly arranged up and down, and the two ends are respectively connected to the frame 2 in rotation, and the entire row of box bodies 1 is simultaneously driven by the first drive assembly, so that each box body The tongue 6 in 1 protrudes forward, and since the through hole 5 communicates with the installation position, the reflective sheet 4 in the box body 1 can be pushed forward, and at the same time, through the limiting effect of the limiting member 3, the The reflective sheet 4 is bent and deformed after being pushed up, and the horizontal curvature of the reflective sheet 4 is adjusted by controlling the first driving component to control the push-up distance of the tongue 6 .

Since both ends of the box body 1 are rotatably connected to the frame 2, through the cooperation of the second drive assembly and the turning connector 7, the box body 1 can be driven to turn over along the horizontal axis at the same time, so that the reflection sheet 4 is turned over accordingly , the longitudinal curvature can be adjusted.

Through the cooperative adjustment of the first drive assembly and the second drive assembly, the reflecting sheets 4 in the plurality of cassettes 1 can finally form a shape similar to a concave surface, thereby realizing the focusing effect of the neutron beam.

It can be understood that the specific embodiment of the monochromator with adjustable focusing radius provided by the present invention is arranged according to the arrangement in the drawings, that is, the box body 1 is placed horizontally along the length direction, and a plurality of box bodies 1 are placed along the longitudinal direction. Arranged in a vertical arrangement, in this way, the first drive assembly adjusts the horizontal curvature, and the second drive assembly adjusts the longitudinal curvature; if the box body 1 is not arranged in the way in this embodiment, for example Arranged vertically in the length direction and arranged horizontally, the purpose of the present invention can also be achieved in this way, which also belongs to the protection scope of the present invention. Therefore, in order to facilitate understanding and explanation, the specific embodiments provided by the present invention are described according to the arrangement in the drawings.

As a preference, in order to make the adjustment accuracy of the horizontal curvature higher, the present invention provides a preferred structure and installation form of the depressing tongue 6, that is, the end of the depressing tongue 6 close to the middle of the box body 1 and the box body 1 Rotationally connected, a top block 8 is provided on the front side of the end away from the middle part of the box body 1, and the top block 8 can abut against the reflective sheet 4; the stopper 3 includes two pressure heads 9, two The two indenters 9 are respectively arranged on both sides of the middle part of the box body 1; the two top blocks 8 are closer to both ends of the box body 1 in the length direction than the two indenters 9. Under this structure, the depressing tongue 6 is connected to the box body 1 by rotation, the top block 8 is on both sides of the box body 1, and the pressure head 9 is arranged in the middle to form a lever structure, which is more labor-saving. At the same time, the reflective sheet 4 can Both ends are bent forward, and the middle part is raised backward, forming an arc surface as a whole with a more precise curvature.

After the reflection sheet 4 is installed in the installation position, there is usually a gap between the pressure head 9 and the top block 8. In order to eliminate the gap and make it in a pressed contact state before adjustment, a preferred way is that the top block 8 is movably connected to the On the depressing tongue 6, and the back side of the depressing tongue 6 is provided with an adjusting screw 10, by turning the adjusting screw 10, the protruding distance of the top block 8 can be adjusted, thereby eliminating the contact between the reflector 4 and the depressing plate. The gap between the head 9 and the top block 8 ensures the accuracy of adjustment.

Specifically, in the specific embodiment of the monochromator provided by the present invention, the frame 2 includes a top plate 28, a bottom plate 29 and side plates 24 on both sides, and the back side of the depressing tongue 6 is provided with a pressure bearing member 11; The first drive assembly includes two rotating shafts 12 installed on the frame 2, the rotating shafts 12 are vertically installed between the top plate 28 and the bottom plate 29, and are located on the back side of the box body 1, the rotating shafts 12 are eccentric structure, its cylindrical surface abuts against the pressure-bearing member 11, and since the box body 1 needs to be overturned, the pressure-bearing member 11 can be set as an arc-shaped convex structure, and at least forms a line contact with the cylindrical surface of the rotating shaft 12, which can To avoid the additional moment generated when the box body 1 rotates along the horizontal axis, which will affect the turning over.

The first drive assembly also includes a first drive motor 16 installed on the top plate 28 , the first drive motor 16 is provided with two power output ends, and is synchronously connected to the two rotating shafts 12 . This can not only ensure that the depressing tongues 6 at both ends are pushed up synchronously, improve the adjustment accuracy, but also facilitate automatic control, and can also save costs due to the reduction of motors.

In the adjustment of the longitudinal curvature, in order to achieve precise adjustment, a contact 17 is provided on the flip connector 7 on each box body 1, which is located on the back side of the box body 1; the second drive assembly includes a helical shaft 18. It is installed vertically between the top plate 28 and the bottom plate 29. The screw shaft 18 is provided with positive and negative two-way thread grooves 19, preferably from the middle position to both ends to provide a positive and negative two-way thread grooves 19, the thread grooves The width of 19 matches the contact 17, the pitch of the thread groove 19 matches the distance between two adjacent contacts 17, and the contacts 17 of each box body 1 are embedded in the thread groove 19 in turn , in order to avoid jamming, the contact 17 preferably has a spherical structure. The second drive assembly also includes a second drive motor 23 mounted on the frame 2, and the second drive motor 23 is in transmission connection with the screw shaft 18. In this specific embodiment, the second drive motor 23 is installed At the bottom of the base plate 29, it is connected with the lower end of the threaded rotating shaft. When the second driving motor 23 works, it can drive the screw shaft 18 to rotate. Since the helical direction is forward and reverse, the flipping directions of the box body 1 at the upper half and the box body 1 at the lower half are just opposite, and then The overall box body 1 is provided with an expected longitudinal curvature radius in the longitudinal direction.

In order to achieve precise longitudinal curvature radius adjustment, the lead angle of the thread needs to be geometrically calculated in advance, so as to ensure that the box body 1 in the upper half and the box body 1 in the lower half are combined into a circle as much as possible when turned over. Arc arrangement.

Because the two ends of the box body 1 need to be rotatably connected with the side plates 24, in order to facilitate installation, the inboards of the two side plates 24 can be provided with chute 25, and both sides of the box body 1 are respectively provided with a slide block 26, and the slide block 26 and The box body 1 is rotatably connected and connected with the slide groove 25 at the same time. The sliding block 26 is provided with matching holes, and the two sides of the box body 1 are provided with box rotating shafts 27 for rotational connection. During installation, one end of the two side plates 24 can be fixed on the base plate 29 earlier, and each box body 1 is connected with the two sliders 26 by the box rotating shaft 27 on both sides earlier, and then from the chute 25 upper ends of the side plates 24 Insert one by one down. If the installation structure of the chute 25 and the slide block 26 is not used, and the holes connected with the box rotating shaft 27 are directly provided on the two side plates 24, all the box bodies 1 need to be installed on one side plate 24 earlier during installation. , and then use another side plate 24 to align the box shafts 27 on the other side of the box body 1 together, it will be very troublesome, it is difficult to align the hole positions, and after using the structure of the chute 25 and the slide block 26, it can be done one by one. Plug in for quick and easy installation.

As a preference, after all the reflecting sheets 4 are installed in place, before adjusting the curvature in two directions, in order to realize the determination of the initial position, a first reset hole 13 can be opened on the non-rotating axis 12 line position on the end face of one end of the rotating shaft 12 , in this embodiment, set the shaft end at the bottom end of the rotating shaft 12. At the same time, a first insertion hole 14 that is compatible with the first reset hole 13 is provided at a corresponding position on the bottom plate 29. By inserting it into the first reset hole 13 A reset hole 13 and a first pin shaft 15 matched with the first insertion hole 14 can ensure that the rotating shaft 12 is in an initial position. The position of the hole at the shaft end is pre-calculated and set to ensure that the pin shaft can be determined to be at the initial position of adjustment after being inserted.

Similarly, in order to determine the initial position of the longitudinal curvature adjustment, a second reset hole 20 is opened on the end surface of the shaft end of the helical shaft 18 at the position of the non-rotating shaft 12 line. A second insertion hole 21 compatible with the second reset hole 20 is provided, and by inserting a second pin shaft 22 compatible with the second reset hole 20 and the second insertion hole 21, it can be determined The screw shaft 18 is at the initial position, so it can be determined that the current box body 1 is at the initial adjustment position (non-turnover state).

In summary, in the monochromator with adjustable focusing radius provided by the present invention, each box body 1 is equipped with a reflective sheet 4 (silicon wafer), and two indenters 9 are arranged on both sides of the reflective surface. There are two top blocks 8 at the far end of the head 9 to press against the silicon chip, and make the reflective surface of the silicon chip form a horizontal radius of curvature. Its basic principle is shown in Figure 9. The size of the horizontal radius of curvature is determined by the displacement of the top block 8. The displacement of the top block 8 mounted on the depressing tongue 6 in the silicon wafer box is driven by the eccentric displacement generated by the rotation of the eccentric rotating shaft 12, so the realization of the horizontal radius of curvature of the silicon wafer is realized in the silicon wafer box.

There are two box rotating shafts 27 at both ends of the silicon wafer box, which can rotate in the frame 2, and the silicon wafers inside it also rotate with the box body 1. The angle of rotation is determined by the longitudinal radius of curvature. The rotation angles of each box body 1 are different under the same radius of curvature. The rotation angle of each box body 1 is zero at the beam center, and the rotation angle of each box body 1 gradually increases from the center to the outside, so that the center of the reflective surface of each silicon wafer The normal passes through the desired focus radius of curvature. The control of the rotation angle of each box body 1 is realized by the helical shaft 18 . The helical shaft 18 has not less than the number of helical grooves of the box body 1, and the lift of each helical groove is different to adapt to the changing requirements of the rotation angle of each box body 1 under the same radius of curvature. There is a circular tongue (contact 17) in the middle of each box body 1 and is inserted in its corresponding spiral groove, and the rotation angle of the silicon wafer box is changed along with the rotation of the spiral column to achieve a set longitudinal radius of curvature.

In describing the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", The orientation or positional relationship indicated by "bottom", "inner", "outer", and "circumferential" are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying References to devices or elements must have a particular orientation, be constructed, and operate in a particular orientation and therefore should not be construed as limiting the invention.

In the present invention, unless otherwise clearly specified and limited, terms such as "installation", "connection", "connection" and "fixation" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection , or integrated; it may be mechanically connected or electrically connected; it may be directly connected or indirectly connected through an intermediary, and it may be the internal communication of two components or the interaction relationship between two components, unless otherwise specified limit. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

In the present invention, unless otherwise clearly specified and limited, the first feature may be in direct contact with the first feature or the first and second feature may be in direct contact with the second feature through an intermediary. touch. Moreover, "above", "above" and "above" the first feature on the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. "Below", "beneath" and "beneath" the first feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is less horizontally than the second feature.

In the description of this specification, descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific examples", or "some examples" mean that specific features described in connection with the embodiment or example , structure, material or feature is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the described specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without conflicting with each other.

Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, those skilled in the art can make the above-mentioned The embodiments are subject to changes, modifications, substitutions and variations.

Claims (10)

1. A monochromator with an adjustable focus radius, characterized in that it comprises a box body, a frame, a first drive assembly and a second drive assembly for placing a reflector; The box body is a strip-shaped structure, and its front side is provided with a limit piece and a mounting position for placing the reflective sheet. After the reflective sheet is placed in the mounting position, it passes through the The limit piece is pressed; Both ends of the box body are rotatably connected to the frame, and the rotation axis is parallel to the length direction of the box body; The two ends of the box body are respectively provided with a through hole along the width direction, and the through hole is provided with a tongue that is rotatably connected with the box body, and its rotation axis is parallel to the width direction of the box body; There are multiple boxes, which are arranged sequentially along the width direction; The first driving assembly is simultaneously driven and connected to the depressing tongue on each of the boxes, and can drive the depressing tongue to rotate, and make the reflective sheet bend forward under the cooperation of the stopper fold; The box body is provided with an overturn connector, and the second driving assembly is simultaneously driven and connected to the overturn connector on each of the box bodies to drive the box body to rotate. 2. A monochromator with adjustable focus radius according to claim 1, characterized in that, the end of the depressing tongue close to the middle part of the box body is rotatably connected with the box body, away from the middle part of the box body A top block is provided on the front side of one end, and the top block abuts against the reflective sheet; The limiter includes two pressure heads, and the two pressure heads are respectively arranged on both sides of the middle part of the box body; The two jacking blocks are closer to both ends of the box body in the length direction than the two pressing heads. 3. The monochromator with adjustable focusing radius according to claim 2, wherein the top block is movably connected to the depressing tongue, and the back side of the depressing tongue is provided with an adjusting screw, The protruding distance of the top block can be adjusted by turning the adjusting screw. 4. A monochromator with adjustable focusing radius according to claim 1, characterized in that, the back side of the depressing tongue is provided with a pressure-bearing member in the shape of an arcuate convex structure; The first drive assembly includes two rotating shafts mounted on the frame, the rotating shafts are eccentric, and the cylindrical surfaces of the rotating shafts abut against the pressure bearing member. 5. A monochromator with adjustable focusing radius according to claim 4, characterized in that, the two ends of the rotating shaft are respectively connected to the frame in rotation, and the non-rotating axis position on the end surface of one end is provided with a second A reset hole, the corresponding position on the frame is provided with a first insertion hole adapted to the first reset hole, by inserting the first pin shaft adapted to the first reset hole and the first insertion hole, the Make sure that the rotating shaft is at the initial position. 6. The monochromator with adjustable focusing radius according to claim 4, wherein the first drive assembly also includes a first drive motor mounted on the frame, and the first drive motor There are two power output ends, which are synchronously connected with the two rotating shafts. 7. A monochromator with adjustable focusing radius according to claim 1, characterized in that, the flip connector includes a contact, which is arranged on the back side of the box body; The second driving assembly includes a helical shaft, and the helical shaft is provided with forward and reverse thread grooves, and the contacts of each of the boxes are sequentially inserted into the thread grooves. 8. The monochromator of a kind of adjustable focus radius according to claim 7, is characterized in that, The two ends of the spiral shaft are respectively connected to the frame in rotation, and a second reset hole is provided on the end surface of one end at the position of the non-rotational axis, and a second insertion hole matching the second reset hole is provided at a corresponding position on the frame. hole, by inserting a second pin shaft that fits into the second reset hole and the second insertion hole, it can be determined that the screw shaft is in an initial position. 9. The monochromator with adjustable focusing radius according to claim 7, wherein the second driving assembly also includes a second driving motor mounted on the frame, and the second driving motor It is connected with the transmission of the screw shaft. 10. A monochromator with adjustable focusing radius according to any one of claims 1 to 9, characterized in that, the frame comprises two side plates, and the two side plates are respectively arranged on the box Both sides in the length direction of the body; The inner sides of the two side plates are provided with slide grooves; Both sides of the box body are respectively provided with a slider, and the sliders are rotatably connected with the box body and are connected with the chute at the same time.

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