Neutron collimator structure

Abstract

The present invention belongs to the technical field of neutron collimators and discloses a neutron collimator structure, which includes a first collimator tube, a second collimator tube, a limit plate and an aperture assembly. The second end of the first collimator tube is provided with a first protrusion, and the two ends of the second collimator tube are respectively provided with a second recessed portion and a second protrusion. A limit plate is installed on the flange surface at the connection position of the first collimator tube and the second collimator tube. The limit plate is used to limit the relative rotation of the first collimator tube and the second collimator tube. The first protrusion and the second recessed portion are plugged into and matched to achieve coaxial docking installation of the first collimator tube and the second collimator tube to meet higher coaxiality requirements and, at the same time, achieve angular rotation limitation. The end cover is provided on the second collimator tube, and the end cover is provided with an arc groove. The aperture plate is plugged into the arc groove, and the arc surface of the aperture plate is pressed against the inner wall of the arc groove. The higher coaxiality requirements are achieved through the cooperation between the arc groove and the aperture plate.

Description

Technical Field

[0001] The present invention relates to the technical field of neutron collimators, and in particular to a neutron collimator structure. Background Art

[0002] Small-angle neutron scattering (SANS) is an experimental technique that uses elastic neutron scattering at low scattering angles to study the internal mesoscopic structure of various materials. It is widely used in the development of new energy, new materials, and new drugs. To reduce air spurious neutrons in the incident light path near the sample, a sample vacuum chamber is typically placed in the SAS spectrometer. To further minimize neutron losses along the neutron flight path, neutrons emitted from the neutron source are collimated by a neutron collimator, which constrains the longitudinal and transverse angular divergence of the neutrons along the desired direction, thereby forming a focused neutron beam.

[0003] Because small-angle neutron scattering experiments require extremely high collimation and positioning accuracy for neutron optical components, conventional neutron collimators, due to their inherent structural influence, have neutrons reflected from their inner walls, reducing collimation performance. Furthermore, the collimation distance is short, and the beam divergence is large, requiring high coaxiality with the neutron beam. Furthermore, in scattering experiments, a circular aperture is added before the sample to further constrain the neutron spot size and divergence, and this circular aperture also requires high coaxiality with the neutron beam.

[0004] Therefore, a neutron collimator structure is urgently needed to solve the above problems. Summary of the Invention

[0005] The object of the present invention is to provide a neutron collimator structure that can achieve angular rotation limitation in an angular direction, improve the coaxiality between two adjacent collimators, and achieve higher coaxiality requirements between the aperture and the collimator.

[0006] In order to solve the above problems existing in the prior art, the present invention adopts the following technical solutions:

[0007] A neutron collimator structure is configured to be mounted in a collimator cabin having a vacuum chamber, comprising:

[0008] a first collimator tube, hermetically connected to the bellows of the collimator cabin, wherein a first end of the first collimator tube is in communication with the vacuum chamber of the collimator cabin, and a first protrusion is provided at a second end of the first collimator tube;

[0009] a second collimator tube connected to the first collimator tube, wherein a second recessed portion and a second protruding portion are respectively provided at both ends of the second collimator tube, and the first protruding portion of the first collimator tube is plugged into and fitted with the second recessed portion of the second collimator tube;

[0010] a limit plate, mounted on the butt flange surfaces of the first collimator tube and the second collimator tube, the limit plate being used to limit relative rotation of the first collimator tube and the second collimator tube;

[0011] The aperture assembly includes an aperture plate and an end cover, wherein the end cover is arranged on the second collimating tube and is provided with an arc groove, the aperture plate is inserted into the arc groove, and the arc surface of the aperture plate is tightly pressed against the inner wall of the arc groove.

[0012] Preferably, there are multiple second collimating tubes, and the second protrusion of one of every two adjacent second collimating tubes is inserted into the second recessed portion of another second collimating tube. The second collimating tubes include a shell and a neutron absorption tube, the outer peripheral wall of the neutron absorption tube is fixedly connected to the inner peripheral wall of the shell, the neutron absorption tube is made of boron aluminum alloy material, and the shell is made of aluminum alloy material.

[0013] Preferably, there are a plurality of the limiting plates, and the plurality of limiting plates are arranged at intervals along the circumferential direction of the second collimating tube.

[0014] Preferably, the neutron collimator structure also includes a locking assembly, which includes a locking screw and two mounting seats. The mounting seats are arranged on the docking flange surface, and the mounting seats have connecting holes. The locking screws are sequentially passed through the connecting holes of the two mounting seats so that the two mounting seats lock the relative positions of the first collimator tube and the second collimator tube.

[0015] Preferably, the aperture assembly further includes a locking member, a threaded hole is provided on the side wall of the arc-shaped groove, and the locking member passes through the threaded hole and abuts against the arc surface of the aperture plate.

[0016] Preferably, the neutron collimator structure further includes a sealing ring, the end cover is provided with a third recessed portion, and the sealing ring is sandwiched between the second protruding portion and the third recessed portion.

[0017] Preferably, the aperture assembly further includes a sapphire window and a pressing plate, the pressing plate is fixed and pressed so that the sapphire window presses against the sealing ring, and the sapphire window is configured to be sapphire.

[0018] Preferably, the neutron collimator structure also includes a fixing mechanism, which includes a sleeve and a plurality of fixing claws. The sleeve is sleeved on the first collimator tube, and along the circumferential direction of the sleeve, the plurality of fixing claws are spaced apart on the outer circumferential surface of the sleeve, and the fixing claws are fixedly connected to the ribs of the collimator cabin.

[0019] Preferably, the fixing mechanism also includes a plurality of adjusting bolts, the sleeve is a rectangular tube, and the outer peripheral wall of the sleeve is provided with a mounting hole. There are multiple mounting holes, and the multiple mounting holes are spaced apart along the outer peripheral direction of the sleeve. The adjusting bolt passes through the mounting hole and is tightened against the outer peripheral wall of the first collimating tube.

[0020] Preferably, the fixing mechanism also includes two limit assemblies, which are respectively arranged at the two ends of the sleeve, and the limit assemblies include an adjustment screw and a mounting plate, the mounting plate is fixedly connected to the outer peripheral surface of the first collimating tube, and the adjustment screw is passed through the mounting plate and pressed against the sleeve.

[0021] The beneficial effects of the present invention are:

[0022] The neutron collimator structure provided by the present invention is used to be installed in a collimator cabin. A first collimator tube is sealed and connected to the bellows of the collimator cabin. The first end of the first collimator tube is connected to the vacuum chamber of the collimator cabin, and the second end of the first collimator tube is provided with a first protrusion. A second collimator tube is connected to the first collimator tube. The two ends of the second collimator tube are respectively provided with a second recess and a second protrusion. A limit plate is installed on the flange surface at the connection position of the first collimator tube and the second collimator tube. The limit plate is used to limit the relative rotation of the first collimator tube and the second collimator tube. The first protrusion and the second recess are plugged into each other, and the coaxial docking installation of the first collimator tube and the second collimator tube is achieved by the limit plate installed on the flange surface, achieving high coaxiality requirements. At the same time, the angular direction rotation is limited under the action of the limit plate, ensuring that the first collimator tube and the second collimator tube are aligned without angular misalignment. The aperture assembly includes an aperture plate and an end cover. The end cover is arranged on the second collimator tube, and the end cover is provided with an arc groove. The aperture plate is inserted into the arc groove, and the arc surface of the aperture plate is tightly pressed against the inner wall of the arc groove. The higher coaxiality requirements are achieved through the cooperation of the arc groove and the aperture plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic diagram of a neutron collimator structure in an embodiment of the present invention;

[0024] Figure 2 for Figure 1 A partial enlarged view of point I in the middle;

[0025] Figure 3 A cross-sectional view of the neutron collimator structure in an embodiment of the present invention Figure 1 ;

[0026] Figure 4 A cross-sectional view of the neutron collimator structure in an embodiment of the present invention Figure 2 ;

[0027] Figure 5 A side view of a neutron collimator structure according to an embodiment of the present invention;

[0028] Figure 6 Schematic diagram of the structure of the second collimator in an embodiment of the present invention;

[0029] Figure 7 is a side view of a second collimator in an embodiment of the present invention;

[0030] Figure 8 is a cross-sectional view of a second collimator according to an embodiment of the present invention;

[0031] Figure 9 Schematic diagram of an explosion of an aperture assembly according to an embodiment of the present invention;

[0032] Figure 10 2 is a cross-sectional view of the aperture assembly in an embodiment of the present invention.

[0033] Reference numerals:

[0034] 1. The first collimator;

[0035] 2. Second collimator; 21. Shell; 22. Neutron absorption tube;

[0036] 3. Limit plate;

[0037] 4. Aperture assembly; 41. Aperture plate; 42. End cap; 421. Arc groove; 43. Locking piece; 44. Sapphire window; 45. Pressing plate; 46. Anti-slip plate;

[0038] 5. Locking assembly; 51. Locking screw; 52. Mounting seat;

[0039] 6. Fixing mechanism; 61. Sleeve; 62. Fixing claw; 63. Adjusting bolt; 64. Limiting assembly; 641. Adjusting top screw; 642. Mounting plate. DETAILED DESCRIPTION

[0040] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0041] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0042] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0043] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are used to refer to positions or locations based on those shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0044] Since the neutron small-angle scattering experimental technology requires very high collimation and positioning accuracy of neutron optical components, the conventional neutron collimator is affected by its own structure and its inner wall will reflect neutrons, reducing the collimation performance. In addition, the collimation distance is short and the beam divergence is large, requiring a high coaxiality with the neutron beam. At the same time, in the scattering test, a circular aperture needs to be installed in front of the sample to further constrain the spot size and divergence of the neutrons, and the coaxiality of the circular aperture and the neutron beam is also required to be high. In this regard, this embodiment provides a neutron collimator structure that can achieve angular rotation limit, improve the coaxiality between two adjacent collimating tubes, and achieve high coaxiality requirements between the aperture and the collimating tube.

[0045] like Figures 1-10As shown, in this embodiment, the neutron collimator structure is intended to be installed in a collimator cabin and includes a first collimator tube 1, a second collimator tube 2, a limit plate 3, and an aperture assembly 4. The first collimator tube 1 is sealed to the bellows of the collimator cabin. The first end of the first collimator tube 1 is in communication with the vacuum chamber of the collimator cabin, and the second end of the first collimator tube 1 is provided with a first protrusion. The second collimator tube 2 is in communication with the first collimator tube 1, and the second ends of the second collimator tube 2 are respectively provided with a second recess and a second protrusion. The first protrusion of the first collimator tube 1 is plugged into the second recess of the second collimator tube 2. The limit plate 3 is mounted on the mating flange surface of the first collimator tube 1 and the second collimator tube 2. The limit plate 3 is used to limit the relative rotation of the first collimator tube 1 and the second collimator tube 2. The aperture assembly 4 includes an aperture plate 41 and an end cap 42. The end cap 42 is mounted on the second collimator tube 2 and is provided with an arcuate groove 421. The aperture plate 41 is inserted into the arcuate groove 421, and the arcuate surface of the aperture plate 41 is tightly abutted against the inner wall of the arcuate groove 421. Specifically, the first collimator tube 1 is made of stainless steel and has a square hole formed inside. A rectangular neutron absorber tube 22 is installed in the square hole. The rectangular neutron absorber tube 22 is made of a boron-aluminum alloy material. The boron-aluminum alloy contains boron carbide that can absorb neutrons. The front and rear end faces of the first collimator tube 1 are both circular flange sealing surfaces, and the first and second ends of the first collimator tube 1 are respectively provided with a first recessed portion and a first protruding portion. The first collimator tube 1 is an integrally processed structure, and the internal rectangular tube is formed by wire cutting. The circular sealing flange surfaces of the front end face and the rear end face of the second collimator tube 2 are respectively provided with a second recessed portion and a second protruding portion, and a limiting plate 3 is installed on the flange surface at the connection position of the first collimator tube 1 and the second collimator tube 2. The first protruding portion and the second recessed portion are plugged into each other, and the coaxial docking installation of the first collimator tube 1 and the second collimator tube 2 is quickly realized through the limiting plate 3 installed on the flange surface, meeting the requirement of higher coaxiality. At the same time, under the action of the limiting plate 3, the angular direction rotation limit is realized to ensure that the first collimator tube 1 and the second collimator tube 2 are aligned without angular misalignment, and only need to be aligned once, and subsequent replacement does not require re-alignment, which is convenient and fast. An end cap 42 is mounted on the end of the second collimator 2 and defines a hole for neutrons to pass through. It also includes an arcuate slot 421. The depth of the slot 421 is slightly greater than the thickness of the aperture plate 41 by 0.1 mm. Furthermore, the width of the slot 421 and the semicircular diameter at its bottom are slightly greater than the diameter of the aperture plate 41 by 0.05 mm. This alignment of the slot 421 with the aperture plate 41 ensures high coaxiality.

[0046] Further, continue to refer to Figures 1-10There are multiple second collimators 2. The second protrusion of one of the two adjacent second collimators 2 is plugged into the second recess of the other second collimator 2. The second collimator 2 includes a shell 21 and a neutron absorption tube 22. The outer peripheral wall of the neutron absorption tube 22 is fixedly connected to the inner peripheral wall of the shell 21. The neutron absorption tube 22 is made of boron aluminum alloy material, and the shell 21 is made of aluminum alloy material. Specifically, in this embodiment, three second collimators 2 are provided, which have the same structure. The specific number is designed to be different lengths or segments as needed, and multiple second collimators 2 are connected end to end in sequence. In order to reduce weight, the shell 21 is made of aluminum alloy, with a square threaded hole inside and a cylindrical structure outside. The diameter of the second protrusion is 0.1 mm smaller than the diameter of the second recess. When docking, the coaxiality of the two adjacent collimators can be better than 0.2 mm through the cooperation of the two.

[0047] Further, continue to refer to Figures 1-10 There are multiple limit plates 3, spaced apart along the circumference of the second collimator tube 2. Specifically, four limit plates 3 are mounted on the circular sealing flange at the rear end of the second collimator tube 2 to provide angular positioning, ensuring that the internal square holes of two adjacent second collimator tubes 2 are aligned without angular misalignment. The arcuate groove 421 of the end cap 42, through the third recessed portion of the flange surface, mates with the second protruding portion of the flange surface of the second collimator tube 2. Together with the multiple limit plates 3, the end cap 42 and the second collimator tube 2 are coaxially docked.

[0048] Further, continue to refer to Figures 1-10 The neutron collimator structure also includes a locking assembly 5, which includes a locking screw 51 and two mounting seats 52. The mounting seats 52 are arranged on the mating flange surface and have connecting holes, wherein one mounting seat 52 is a through hole and the other is a threaded hole. The locking screws 51 are sequentially inserted through the through hole of one mounting seat 52 and threadedly connected to the threaded hole of the other mounting seat 52, so that the two mounting seats 52 lock the relative positions of the first collimator tube 1 and the second collimator tube 2. All second collimators 2 are locked with the first collimator tube 1 by four sets of locking assemblies 5, and the second collimator tubes 2 can be sealed with the end cap 42. According to experimental needs, unnecessary second collimators 2 can be removed by simply loosening the locking assembly 5.

[0049] Further, continue to refer to Figures 1-10 The aperture assembly 4 further includes a locking member 43. The sidewalls of the arcuate slot 421 are provided with threaded holes. The locking member 43 passes through the threaded holes and abuts against the arcuate surface of the aperture plate 41. Specifically, the locking member 43 is configured as a screw. After the aperture plate 41 is inserted into the arcuate slot 421 of the end cap 42, the locking member 43 arranged on both sides of the end cap 42 achieves locking.

[0050] Further, continue to refer to Figures 1-10 The neutron collimator structure further includes a sealing ring. The end cap 42 is provided with a third recessed portion. The sealing ring is sandwiched between the second protruding portion and the third recessed portion. Specifically, the sealing ring is made of rubber material, and a vacuum seal is achieved by compression of the sealing ring.

[0051] Further, continue to refer to Figures 1-10 The aperture assembly 4 also includes a sapphire window 44 and a pressure plate 45. The pressure plate 45 is fixed and pressed against the sapphire window 44 so that the sapphire window 44 is pressed against the sealing ring. The sapphire window 44 is set to sapphire. Specifically, in order to achieve an overall vacuum seal, a sapphire window 44 and a pressure plate 45 are installed in the middle of the end cover 42. The pressure plate 45 presses the sapphire window 44 so that the sapphire window 44 and the sealing ring in the third recess of the end cover 42 are vacuum-sealed. A square hole is opened in the middle of the pressure plate 45. The diameter of the square hole is larger than the size of the neutron beam spot. The pressure plate 45 is made of boron aluminum alloy material, which can absorb stray neutrons that pass through. Sapphire material has a high transmittance to neutrons, so the loss of neutrons passing through the sapphire window 44 is very small. The aperture assembly 4 also includes an anti-slip plate 46, which is fixed to the outer end face of the end cover by screws.

[0052] Further, continue to refer to Figures 1-10 The neutron collimator structure also includes a fixing mechanism 6, which includes a sleeve 61 and multiple fixing claws 62. The sleeve 61 is mounted on the first collimator tube 1. Along the circumference of the sleeve 61, multiple fixing claws 62 are spaced apart on the outer circumference of the sleeve 61, and the fixing claws 62 are fixedly connected to the ribs of the collimator cabin. Specifically, the sleeve 61 is surrounded by a rectangular tube bottom plate, a rectangular tube left plate, a rectangular tube right plate, and a rectangular tube top plate, all of which are made of stainless steel. The sleeve 61 is installed in the middle of the first collimator tube 1, and the inner dimension of the sleeve 61 is slightly larger than the outer dimension of the first collimator tube 1 by about 5mm on one side. The fixing claws 62 are fixedly connected to the sleeve 61 by bolts, and the fixing claws 62 are used to connect to the ribs of the collimator cabin.

[0053] Further, continue to refer to Figures 1-10The fixing mechanism 6 also includes multiple adjustment bolts 63. The sleeve 61 is a rectangular tube with multiple mounting holes disposed on its outer circumferential wall. The mounting holes are spaced apart along the outer circumference of the sleeve 61. The adjustment bolts 63 pass through the mounting holes and abut against the outer circumferential wall of the first collimator 1. Specifically, one adjustment bolt 63 is disposed on each of the top and bottom plates of the rectangular tube, and two adjustment bolts 63 are disposed on each of the left and right plates of the rectangular tube. All adjustment bolts 63 abut against the outer circumferential wall of the first collimator 1. A tracker is installed to measure the multiple target mounts welded to the outside of the first collimator 1, and high-precision positioning of the first collimator 1 on the beam line is achieved by adjusting the adjustment bolts 63.

[0054] Further, continue to refer to Figures 1-10 The fixing mechanism 6 further includes two limiting assemblies 64, which are respectively arranged at the two ends of the sleeve 61. The limiting assemblies 64 include an adjustment screw 641 and a mounting plate 642. The mounting plate 642 is fixedly connected to the outer circumferential surface of the first collimator tube 1. The adjustment screw 641 is passed through the mounting plate 642 and pressed against the sleeve 61. Specifically, a mounting plate 642 is respectively installed on both sides of the top surface of the first collimator tube 1. Each mounting plate 642 is installed with an adjustment screw 641. The adjustment screw 641 presses against the top plate of the rectangular tube. The spatial position of the first collimator tube 1 can be adjusted and positioned by using multiple adjusting bolts 63 and the adjustment screw 641.

[0055] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A neutron collimator structure, for installation in a collimator cabin having a vacuum chamber, characterized in that: include: A first collimator tube (1) is sealed and connected to the bellows of the collimator cabin, a first end of the first collimator tube (1) is connected to the vacuum chamber of the collimator cabin, and a second end of the first collimator tube (1) is provided with a first protrusion; A second collimator (2) is connected to the first collimator (1), and a second recessed portion and a second protruding portion are respectively provided at both ends of the second collimator (2), and the first protruding portion of the first collimator (1) is plugged into and fitted with the second recessed portion of the second collimator (2); A limit plate (3) is installed on the butt flange surfaces of the first collimator tube (1) and the second collimator tube (2), and the limit plate (3) is used to limit the relative rotation of the first collimator tube (1) and the second collimator tube (2); An aperture assembly (4) comprises an aperture plate (41) and an end cover (42), wherein the end cover (42) is arranged on the second collimator (2), and the end cover (42) is provided with an arcuate groove (421), the aperture plate (41) is plugged into the arcuate groove (421), and the arcuate surface of the aperture plate (41) is tightly pressed against the inner wall of the arcuate groove (421); The aperture assembly (4) further includes a locking member (43), a threaded hole is provided on the side wall of the arc-shaped groove (421), and the locking member (43) passes through the threaded hole and abuts against the arc surface of the aperture plate (41); The sealing ring is provided with a third recessed portion on the end cover (42), and the sealing ring is sandwiched between the second protruding portion and the third recessed portion.

2. The neutron collimator structure according to claim 1, characterized in that: There are multiple second collimating tubes (2), and the second protruding portion of one of the two adjacent second collimating tubes (2) is plugged into the second recessed portion of the other second collimating tube (2). The second collimating tubes (2) include a shell (21) and a neutron absorption tube (22). The outer peripheral wall of the neutron absorption tube (22) is fixedly connected to the inner peripheral wall of the shell (21). The neutron absorption tube (22) is made of a boron aluminum alloy material, and the shell (21) is made of an aluminum alloy material.

3. The neutron collimator structure according to claim 1, characterized in that: There are a plurality of the limiting plates (3), and the plurality of limiting plates (3) are arranged at intervals along the circumferential direction of the second collimating tube (2).

4. The neutron collimator structure according to claim 1, characterized in that: The neutron collimator structure further comprises a locking assembly (5), wherein the locking assembly (5) comprises a locking screw (51) and two mounting seats (52), wherein the mounting seats (52) are arranged on the butt flange surface, and the mounting seats (52) have connecting holes, and the locking screws (51) are sequentially passed through the connecting holes of the two mounting seats (52), so that the two mounting seats (52) lock the relative positions of the first collimator tube (1) and the second collimator tube (2).

5. The neutron collimator structure according to claim 1, characterized in that: The aperture assembly (4) further comprises a sapphire window (44) and a pressing plate (45), wherein the pressing plate (45) is fixed to and pressed against the sapphire window (44) so ​​that the sapphire window (44) is pressed against the sealing ring, and the sapphire window (44) is configured as sapphire.

6. The neutron collimator structure according to claim 1, characterized in that: The neutron collimator structure further comprises a fixing mechanism (6), the fixing mechanism (6) comprising a sleeve (61) and a plurality of fixing claws (62), the sleeve (61) being sleeved on the first collimator tube (1), the plurality of fixing claws (62) being spaced apart on the outer peripheral surface of the sleeve (61) along the circumferential direction of the sleeve (61), and the fixing claws (62) being fixedly connected to the rib plate of the collimator cabin.

7. The neutron collimator structure according to claim 6, characterized in that: The fixing mechanism (6) further includes a plurality of adjusting bolts (63). The sleeve (61) is a rectangular tube. The outer peripheral wall of the sleeve (61) is provided with mounting holes. There are a plurality of mounting holes. The plurality of mounting holes are spaced apart along the outer peripheral direction of the sleeve (61). The adjusting bolts (63) pass through the mounting holes and are pressed against the outer peripheral wall of the first collimating tube (1).

8. The neutron collimator structure according to claim 6, characterized in that: The fixing mechanism (6) further comprises two limiting assemblies (64), the two limiting assemblies (64) being respectively arranged at the two ends of the sleeve (61), the limiting assemblies (64) comprising an adjusting top screw (641) and a mounting plate (642), the mounting plate (642) being fixedly connected to the outer peripheral surface of the first collimating tube (1), the adjusting top screw (641) being passed through the mounting plate (642) and pressed against the sleeve (61).

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