A conical slit device and a slit system

Abstract

A conical slit device and a slit system, comprising: a housing, a shield, a blade assembly, a bracket assembly, and a drive component; the drive component being disposed within the housing; the bracket assembly comprising two first brackets and two second brackets; and the blade assembly comprising two first blades and two second blades; the first blade being mounted on the first bracket, and the second blade being mounted on the second bracket; the two first blades and the two second blades overlapping to form a slit channel, the slit channel facing the opening of the small end face of the shield; the drive component being configured to drive the two first blades to move relative to each other in a first preset direction to change the width of the slit channel in the first preset direction; and the drive component being further configured to drive the two second blades to move relative to each other in a second preset direction to change the height of the slit channel in the second preset direction. This application can provide a slit close to the curved surface for measuring curved samples, thereby ensuring the accuracy of sample measurement.

Description

Technical Field

[0001] The present invention relates to the field of neutron spectrometers, and in particular to a conical slit device and a slit system. Background Art

[0002] Neutron spectrometers primarily use neutrons as a detection tool to study the microstructure and properties of various materials. Currently, spectrometers built worldwide can be divided into two categories: neutron spallation source spectrometers and neutron reactor spectrometers. In many spectrometers, the neutron beam must pass through a narrow slit to limit the flux.

[0003] The neutron collimating aperture (slit) is a crucial component of a neutron spectrometer. It primarily provides the required beam size for sample testing, ensuring high beam size accuracy and a beam free of excessive stray neutrons. Therefore, the aperture opening must be adjustable from maximum to fully closed, and the aperture blades must be highly parallel, flat and smooth, with high repeatability, and low neutron transmittance.

[0004] In the measurement of some samples, for example, samples with curved surfaces, it is necessary to accurately locate the volume of each measurement point in each sample, the slit needs to be close to the sample, and the slit size needs to be adjusted according to the curved surface of the sample.

[0005] Existing planar slits make it difficult to perform high-precision measurements on samples with curved surfaces. Summary of the Invention

[0006] The main technical problem solved by the present invention is that it is difficult for existing planar slits to perform high-precision measurements on samples with curved surfaces.

[0007] According to a first aspect, an embodiment provides a tapered slit device comprising: a housing, a shield, a blade assembly, a bracket assembly, and a drive component;

[0008] The driving component is arranged in the housing; the shield is installed on the housing, the blade assembly and the bracket assembly are located in the shield, and the shield is conical and has an opening on its small end surface;

[0009] The bracket assembly includes two first brackets and two second brackets, and the blade assembly includes two first blades and two second blades; the first blade is mounted on the first bracket, and the second blade is mounted on the second bracket; the two first blades and the two second blades overlap to form a slit channel, and the slit channel faces the opening of the small end surface of the shield;

[0010] The driving component is configured to drive the two first blades to move relative to each other along a first preset direction to change the width of the slit channel in the first preset direction; the driving component is also configured to drive the two second blades to move relative to each other along a second preset direction to change the height of the slit channel in the second preset direction.

[0011] In one embodiment, the driving component includes a base, two first tables, two second tables, two first driving assemblies, and two second driving assemblies, one first bracket is correspondingly mounted on each first table, one second bracket is correspondingly mounted on each second table; one first driving assembly is correspondingly arranged on each first table, and one second driving assembly is correspondingly arranged on each second table;

[0012] The first driving assembly is used to drive the first table to move in a first preset direction relative to the base, and the first blade follows the movement of the first table via the first bracket;

[0013] The second driving assembly is used to drive the second table to move relative to the base in a second preset direction, and the second blade follows the movement of the second table through the second bracket.

[0014] In one embodiment, the first end of the first bracket is connected to the first table, and the distance between the two first ends of the two first brackets is greater than the distance between the two second ends;

[0015] The first end of the second bracket is connected to the second table surface, and the distance between the two first ends of the two second brackets is greater than the distance between the two second ends.

[0016] In one embodiment, the driving component further includes two first measuring components and two second measuring components, wherein one first measuring component is arranged corresponding to one first table, and one second measuring component is arranged corresponding to one second table;

[0017] The first measuring component is used to measure a first distance of movement of the first table relative to the base;

[0018] The second measuring component is used to measure a second distance that the second table moves relative to the base.

[0019] In one embodiment, the first measuring component is a metrological grating, one of the reading head and the grating ruler of the first measuring component is mounted on the base, and the other is mounted on the first table;

[0020] And / or, the second measuring component is a metrological grating, and one of the reading head and the grating ruler of the second measuring component is installed on the base, and the other is installed on the second table.

[0021] In one embodiment, the driving component further includes two first sliding assemblies, each first table top is slidably connected to the base via the two first sliding assemblies, and the sliding direction is a first preset direction;

[0022] And / or, the driving component further includes two second sliding assemblies, each second table top is slidably connected to the base via the two second sliding assemblies, and the sliding direction is a second preset direction.

[0023] In one embodiment, the two first driving components are located on a first surface of the base, and the two second driving components are located on a second surface of the base opposite to the first surface.

[0024] In one embodiment, the two first tables are centrally symmetrically arranged on the base, and / or the two first driving assemblies are centrally symmetrically arranged on the base;

[0025] And / or, the two second tabletops are centrally symmetrically arranged on the base, and / or, the two second driving assemblies are centrally symmetrically arranged on the base.

[0026] In one embodiment, the first drive assembly includes a linear motor, and the linear motor of the first drive assembly is fixed relative to the first table;

[0027] And / or, the second drive assembly includes a linear motor, and the linear motor of the second drive assembly is fixed relative to the base.

[0028] According to a second aspect, an embodiment provides a slit system, comprising a motion device and the tapered slit device described in the first aspect;

[0029] The motion device is used to drive the tapered slit device to move along a second preset direction and a third preset direction, wherein the third preset direction is perpendicular to the second preset direction;

[0030] The motion device includes a base plate, a first motion system, a second motion system, and an adapter assembly. The housing of the tapered slit device is connected to the second motion system via the adapter assembly. The second motion system is used to drive the tapered slit device to move along a second preset direction.

[0031] The second motion system is connected to the bottom plate through the first motion system. The first motion system is used to drive the second motion system to move along a third preset direction. The conical slit device follows the second motion system to move along the third preset direction.

[0032] According to the conical slit device and slit system of the above-mentioned embodiment, the bracket assembly extends from the shell to the small end surface of the shield, and the driving assembly can drive the blade to move through the bracket, forming a slit channel with adjustable size at the opening of the small end surface of the shield, providing a slit close to the curved surface for the measurement of curved samples, thereby ensuring the accuracy of sample measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 Schematic diagram of the structure of a slit system according to an embodiment;

[0034] Figure 2 Schematic diagram of the structure of a slit system according to an embodiment;

[0035] Figure 3 Schematic diagram of the structure of a tapered slit device according to an embodiment;

[0036] Figure 4 Schematic diagram of the structure of a tapered slit device according to an embodiment;

[0037] Figure 5 A schematic structural diagram of a blade assembly and a slit channel according to an embodiment;

[0038] Figure 6 Schematic diagram of the structure of a tapered slit device according to an embodiment;

[0039] Figure 7 Schematic diagram of the structure of a driving component according to an embodiment;

[0040] Figure 8 Schematic diagram of the structure of a driving component according to an embodiment;

[0041] Figure 9 Schematic diagram of the structure of a driving component according to an embodiment;

[0042] Figure 10 Schematic diagram of the structure of a driving component according to an embodiment;

[0043] Figure 11 Schematic diagram of the neutron spectrometer measurement.

[0044] Figure markings: 1-shell; 2-shield; 21-small end face; 3-blade assembly; 30-slit channel; 31-first blade; 32-second blade; 4-bracket assembly; 41-first bracket; 42-second bracket; 5-driving component; 50-base; 51-first table top; 52-second table top; 53-first driving assembly; 54-second driving assembly; 55-first measuring assembly; 56-second measuring assembly; 57-first sliding assembly; 58-second sliding assembly; 59-clearance through hole; 501-clearance groove; 502-bracket; 100-conical slit device; 210-base plate; 220-first motion system; 230-second motion system; 240-adapter assembly; 241-joint connecting plate; 242-universal joint; 250-truss; 260-horizontal adjustment seat. DETAILED DESCRIPTION

[0045] The present invention will be further described in detail below by means of specific embodiments in conjunction with the accompanying drawings. Similar elements in different embodiments are numbered with associated similar elements. In the following embodiments, many detailed descriptions are provided to enable the present application to be better understood. However, those skilled in the art will readily appreciate that some of the features may be omitted in different circumstances, or may be replaced by other elements, materials, or methods. In some cases, some operations related to the present application are not shown or described in the specification. This is to avoid the core portion of the present application being overwhelmed by excessive descriptions, and for those skilled in the art, it is not necessary to describe these related operations in detail. They will fully understand the related operations based on the description in the specification and the general technical knowledge in the art.

[0046] In addition, the features, operations, or characteristics described in the specification may be combined in any appropriate manner to form various embodiments. Furthermore, the steps or actions in the method description may be reordered or adjusted in a manner readily apparent to those skilled in the art. Therefore, the various sequences in the specification and drawings are provided solely for the purpose of clearly describing a particular embodiment and are not intended to be mandatory, unless otherwise specified.

[0047] The serial numbers assigned to components herein, such as "first," "second," etc., are used solely to distinguish the objects being described and do not convey any sequential or technical meaning. References to "connection" and "coupling" herein, unless otherwise specified, include both direct and indirect connections (couplings).

[0048] like Figure 11 As shown in Figure 1, a neutron spectrometer (engineering material diffractometer) needs to measure residual stress at different locations on the sample. The volume (IGV) measured each time is very small. For example, if the distance Sz from the slit outlet to the sample is 100mm, the divergence is designed to be approximately 0.15°, and the opening height (Sy) is 0.1mm, then the actual illuminated height Δy on the sample is 0.62mm. Therefore, in order to improve measurement accuracy, the slit outlet needs to be as close to the sample as possible (in most cases, the slit outlet is in contact with the sample surface), that is, the slit opening size is approximately equal to the IGV (Sy~Δy, Sx~Δx).

[0049] The samples used in engineering materials diffractometers are very large and come in a variety of shapes, some even curved. Examples include aircraft wings, train wheels, and tubular samples. To ensure the slit outlet is close to these unusually shaped components, it must be designed with a pointed or tapered shape. Therefore, the tapered slit has become a crucial component in engineering materials spectrometers.

[0050] To improve the measurement accuracy of curved samples using a neutron spectrometer (engineering materials diffractometer), a slit with a corresponding cross-sectional area must be placed in front of the curved sample. For curved samples, a pointed (conical) slit structure is required, and the slit size must also be varied for different samples. To address these measurement requirements, this application proposes a conical slit device and slit system.

[0051] like Figure 1 and Figure 2 As shown, some embodiments of the present application provide a slit system, which may include a motion device and a tapered slit device 100 .

[0052] The motion device is used to drive the tapered slit device 100 to move along the second preset direction and the third preset direction, and the third preset direction is perpendicular to the second preset direction. In some embodiments, based on the current situation that the neutron spectrometer is large and difficult to adjust its position, the neutron beam generated by the neutron spectrometer generally propagates in the horizontal direction. Therefore, in this application, the first preset direction is the horizontal direction (such as Figure 2 The second preset direction is the vertical direction (such as Figure 2 The third preset direction is the horizontal direction (such as Figure 2 When the slit system is in operation, the second preset direction is set parallel to the propagation direction of the neutron beam and located in the same vertical plane. When the conical slit device 100 is required, the motion device moves the conical slit device 100 to the position directly in front of the curved sample where measurement is required.

[0053] The sports device will be described in detail below.

[0054] In some embodiments, such as Figure 1 and Figure 2 As shown, the motion device may include a base plate 210, a first motion system 220, a second motion system 230 and an adapter assembly 240. The shell 1 of the conical slit device 100 is connected to the second motion system 230 through the adapter assembly 240. The second motion system 230 is used to drive the conical slit device 100 to move along the second preset direction.

[0055] The second motion system 230 is connected to the base plate 210 through the first motion system 220 . The first motion system 220 is used to drive the second motion system 230 to move along a third preset direction. The tapered slit device 100 follows the second motion system 230 to move along the third preset direction.

[0056] For example, the motion device may also include a truss 250 and a horizontal adjustment seat 260. A plurality of horizontal adjustment seats 260 are installed under the base plate 210 to adjust the level of the base plate 210. The truss 250 is used to connect the first motion system 220 with the second motion system 230. By controlling the dimensional accuracy of the truss 250, the precision of the spatial position between the first motion system 220 and the second motion system 230 can be controlled. Among them, the first motion system 220 and the second motion system 230 can both be electric translation stages, which are driven by a motor to rotate the lead screw to drive the table of the electric translation stage to slide on the guide rail; or they can be driven by an electric push rod. The present application adopts a linear motion guide rail to form the first motion system 220 and the second motion system 230, ensuring a high repeatability positioning accuracy and avoiding collisions between the conical slit device 100 and the sample due to poor motion accuracy.

[0057] In some embodiments of the present application, an electric translation stage is employed, which occupies less space and forms a stable motion device through the truss 250. The adapter assembly 240 may include a universal joint 242 and a joint connecting plate 241. The universal joint 242 is used to connect to the housing 1 of the tapered slit device 100. The tapered slit device 100 can adjust the spatial orientation of the slit channel 30 through the universal joint 242, thereby fine-tuning the actual neutron beam direction. The joint connecting plate 241 connects the universal joint 242 to the table of the second motion system 230, allowing the second motion system 230 to drive the tapered slit device 100 to move along the second preset direction.

[0058] In some embodiments, due to the possibility of movement of the sample, the conical slit device 100 may still collide when approaching the sample. Through the universal joint 242, the conical slit device 100 can turn and swing, which can play a buffering role in the event of a collision.

[0059] The above is an explanation of the motion device. The tapered slit device 100 will be described in detail below.

[0060] like Figure 3 and Figure 4 As shown, some embodiments of the present application provide a tapered slit device 100 , which may include: a housing 1 , a shield 2 , a blade assembly 3 , a bracket assembly 4 and a driving component 5 .

[0061] The driving component 5 is arranged in the housing 1; the shield 2 is mounted on the housing 1, the blade assembly 3 and the bracket assembly 4 are located in the shield 2, the shield 2 is conical and its small end face 21 is provided with an opening.

[0062] like Figures 3 to 6As shown, the support assembly 4 may include two first supports 41 and two second supports 42, serving as neutron absorbers. The blade assembly 3 may include two first blades 31 and two second blades 32; one first blade 31 is mounted on one first support 41, and one second blade 32 is mounted on one second support 42; the two first blades 31 and the two second blades 32 overlap to form a slit channel 30, which faces the opening of the small end face 21 of the shield 2. In some embodiments, the blades of the blade assembly 3 are made of boron carbide or enriched 10 B material to meet the requirements of blocking neutron beam, for example, enriched 10 Material B only needs to be 3mm thick to meet the requirements, which can control the overall thickness of the blade assembly 3 and the volume of the tapered slit device 100. It can be made more pointed and have a smaller cone angle, and can be more accurately positioned to meet the measurement needs of curved samples.

[0063] The driving component 5 is configured to drive the two first blades 31 along a first preset direction ( Figure 5 The driving component 5 is further configured to drive the two second blades 32 to move along the second preset direction ( Figure 5 The slit channel 30 moves relative to the vertical direction in the second preset direction to change the height of the slit channel 30. Figure 5 As shown, the relative movement of the two first blades 31 can change the width of the slit channel 30, and the two second blades 32 can change the height of the slit channel 30. Figure 6 As shown, under the action of the driving component 5, when the two first blades 31 and / or the two second blades 32 are closed, the slit channel 30 can be closed.

[0064] like Figure 4 As shown, in some embodiments of the present application, the blade assembly 3 is arranged close to the small end face 21 of the shield 2 by means of the support assembly 4 arranged in a conical distribution, so that the slit channel 30 formed by the blade assembly 3 can be close to the curved surface sample. The applicant's research found that in the application process of the conical slit device 100, in order to cope with various types of curved surface samples, this requires the overall volume to be relatively small, that is, the large end face of the shield 2 should be as small as possible. However, the components such as the motor or cylinder or push rod used to realize the drive occupy volume. In addition, multiple components such as measuring components and connecting components are required to realize the control of the movement size of the blade to control the size of the slit channel 30. Therefore, the reasonable arrangement of the structure of the driving component 5 is conducive to improving the applicability of the conical slit device 100.

[0065] The applicant has found that the size of the large end surface of the shield 2 is limited to a minimum value by the size of the driving component 5. Therefore, the present application satisfies the above requirements by providing a driving component 5. The driving component 5 is described in detail below.

[0066] In some embodiments, such as Figures 7 to 10 As shown, the drive component 5 may include a base 50, two first tables 51, two second tables 52, two first drive assemblies 53, and two second drive assemblies 54. A first bracket 41 is mounted on each first table 51, and a second bracket 42 is mounted on each second table 52. A first drive assembly 53 is provided for each first table 51, and a second drive assembly 54 is provided for each second table 52. A clearance hole 59 is provided on the base 50 corresponding to the slit channel 30. The neutron beam passes through the clearance hole 59 and then through the slit channel 30. For example, the clearance hole 59 is centrally located on the base 50. The first and second tables 51, 52 are designed to correspond to the shape of the clearance hole 59 so that they do not block the clearance hole 59 during movement. Similarly, a through hole (not shown) is also provided on the housing 1 at a position corresponding to the slit channel 30 to accommodate the passage of the neutron beam.

[0067] The first drive assembly 53 is used to drive the first table 51 to move in a first predetermined direction relative to the base 50, and the first blade 31 follows the movement of the first table 51 via the first bracket 41. The second drive assembly 54 is used to drive the second table 52 to move in a second predetermined direction relative to the base 50, and the second blade 32 follows the movement of the second table 52 via the second bracket 42. To ensure stable motion control of the blade assembly 3, one drive assembly drives one bracket to drive the movement of the four blades.

[0068] For example, taking the first drive assembly 53 as an example, the first drive assembly 53 can be installed on the first table 51, and its power output end acts directly or indirectly on the base 50, thereby achieving relative movement between the first table 51 and the base 50. The first drive assembly 53 can also be installed on the base 50, and its power output end acts directly or indirectly on the first table 51, thereby achieving relative movement between the first table 51 and the base 50.

[0069] In some embodiments, such as Figure 4 and Figure 6As shown, the first end of the first bracket 41 is detachably connected to the first table 51, and the second end thereof is used to mount the first blade 31. The spacing between the first ends of the two first brackets 41 is greater than the spacing between the second ends. The first end of the second bracket 42 is detachably connected to the second table 52, and the second end thereof is used to mount the second blade 32. The spacing between the first ends of the two second brackets 42 is greater than the spacing between the second ends. In other words, the arrangement corresponds to the dimensions of the large end surface and the small end surface 21 of the shield 2 to ensure that the brackets maintain a distance from the shield 2 during movement.

[0070] In some embodiments, such as Figures 7 to 10 As shown, the driving component 5 may further include two first measuring components 55 and two second measuring components 56 , wherein one first measuring component 55 is provided corresponding to one first table 51 , and one second measuring component 56 is provided corresponding to one second table 52 .

[0071] The first measuring assembly 55 is used to measure a first distance moved by the first table 51 relative to the base 50, and the second measuring assembly 56 is used to measure a second distance moved by the second table 52 relative to the base 50. The first and second measuring assemblies 55, 56 are selected based on the required accuracy of slit control and can be either displacement sensors or distance sensors.

[0072] In some embodiments, such as Figures 7 to 10 As shown, the first measuring component 55 can be a metrological grating, one of the reading head and the grating scale of the first measuring component 55 is mounted on the base 50, and the other is mounted on the first table 51; and / or, the second measuring component 56 can be a metrological grating, one of the reading head and the grating scale of the second measuring component 56 is mounted on the base 50, and the other is mounted on the second table 52.

[0073] For example, Figures 7 to 10 As shown, the reading heads of the first measuring assembly 55 and the second measuring assembly 56 are both mounted on the base 50, and the grating scales are both mounted on the first table 51 and the second table 52. The use of the measuring gratings allows for high-precision measurement of the movement distance of the two tables, i.e., the distance the blade moves, thereby calculating the size change of the slit channel 30.

[0074] In some embodiments, such as Figures 7 to 10 As shown, the driving component 5 may further include two first sliding assemblies 57, each first table 51 is slidably connected to the base 50 through the two first sliding assemblies 57, and the sliding direction is a first preset direction; and / or, the driving component 5 may further include two second sliding assemblies 58, each second table 52 is slidably connected to the base 50 through the two second sliding assemblies 58, and the sliding direction is a second preset direction.

[0075] The two first sliding assemblies 57 ensure stable movement of the first table 51 relative to the base 50 with minimal resistance, thereby reducing the power requirements of the first drive assembly 53. For example, the first sliding assembly 57 may be a linear guide rail, with one of the guide rail and the slide of the first sliding assembly 57 mounted on the base 50 and the other mounted on the first table 51. In the present application, to control the overall size of the drive component 5, the guide rail is mounted on the base 50 and the slide is mounted on the first table 51, so that the two first tables 51 can share two guide rails, thereby restricting the two first tables 51 to move in the same direction.

[0076] The two second sliding assemblies 58 ensure stable movement of the second table 52 relative to the base 50 with minimal resistance, thereby reducing the power requirements of the second drive assembly 54. For example, the second sliding assembly 58 may be a linear guide rail, with one of the guide rail and the slide of the second sliding assembly 58 mounted on the base 50 and the other mounted on the second table 52. In this application, to control the overall size of the drive component 5, the guide rail is mounted on the base 50 and the slide is mounted on the second table 52, so that the two second tables 52 can share two guide rails, thereby restricting the two second tables 52 to move in the same direction.

[0077] In some embodiments, such as Figures 7 to 10 As shown, two first drive assemblies 53 are located on the first surface of the base 50, and two second drive assemblies 54 are located on the second surface of the base 50, opposite the first surface. To minimize the overall size of the drive assembly 5, placing the first drive assembly 53, the second drive assembly 54, the first table 51, and the second table 52 on the same surface of the base 50 would obviously require a larger space. Furthermore, corresponding measuring and sliding assemblies would need to be installed, significantly increasing the design complexity. In some embodiments of the present application, the first table 51 and the second table 52 are disposed on two planes of the base 50 to reduce the overall size of the drive assembly 5. In this application, the first table 51 is disposed on the first surface of the base 50 facing the blade assembly 3. To further control the overall size of the tapered slit device 100, a clearance groove 501 is provided on the edge of the base 50. The second bracket 42 passes through the clearance groove 501 and is removably fixedly connected to the second table 52. The clearance groove 501 also accommodates movement of the second bracket 42 along a second predetermined direction.

[0078] In some embodiments, such as Figure 7 and Figure 8As shown, the two first tables 51 are centrally symmetrically arranged on the base 50, and / or the two first drive assemblies 53 are centrally symmetrically arranged on the base 50, and / or the two first measuring assemblies 55 are centrally symmetrically arranged on the base 50. Based on the fact that the two first tables 51 are arranged in a centrally symmetrical manner, the two first drive assemblies 53 and the two first measuring assemblies 55 corresponding to the first tables 51 are also centrally symmetrically arranged on the base 50. Thus, the first tables 51, the first drive assemblies 53 and the first measuring assemblies 55 can be compactly arranged on one surface of the base 50. When it is necessary to adjust the width of the slit channel 30, the two first drive assemblies 53 are driven to extend and retract with the same control signal to realize the opening and closing of the two first blades 31. This not only makes the structure of the driving component 5 more compact, but also reduces the complexity required in the control.

[0079] In addition, in order to make the large end surface of the conical shield 2 smaller, as shown in FIG. Figure 7 and Figure 8 As shown, a fixed bracket 502 is further provided on the first surface of the base 50, and the bracket 502 is used to install a nut. In these embodiments, the first drive assembly 53 may include a linear motor. The linear motor of the first drive assembly 53 is fixed relative to the first table 51, and the linear motor is rotatably connected to the nut. The rotating shaft of the linear motor is provided with a thread. When the linear motor rotates, the nut moves axially relative to the rotating shaft, so that the first table 51 moves relative to the bracket 502 under the action of the linear motor. It can be seen that by adopting such a drive method, the first drive assemblies 53 corresponding to the first tables 51 can be set on the same side. At this time, the maximum occupied space size ( Figure 8 The left-right and up-down dimensions in the figure can be smaller than the size of the base 50 so that the size of the large end surface of the shield 2 will not be larger than the size of the base 50.

[0080] like Figure 9 and Figure 10 As shown, the two second tables 52 are centrally symmetrically arranged on the base 50, and / or the two second drive assemblies 54 are centrally symmetrically arranged on the base 50, and / or the two second measuring assemblies 56 are centrally symmetrically arranged on the base 50. Based on the fact that the two second tables 52 are centrally symmetrically arranged, the two second drive assemblies 54 and the two second measuring assemblies 56 corresponding to the second tables 52 are also centrally symmetrically arranged on the base 50. Thus, the second tables 52, the second drive assemblies 54 and the second measuring assemblies 56 can be compactly arranged on the second surface of the base 50. When it is necessary to adjust the width of the slit channel 30, the two second drive assemblies 54 are driven to extend and retract with the same control signal to realize the opening and closing of the two second blades 32. This not only makes the structure of the driving component 5 more compact, but also reduces the complexity required in the control.

[0081] The second drive assembly 54 may include a linear motor, which is fixed relative to the base 50. In this case, the nut can be directly mounted on the second table 52. The rotation shaft of the linear motor is provided with a matching thread. The motor rotates to drive the nut to axially move, thereby driving the second table 52 to move along the second predetermined direction.

[0082] In addition, a limit switch or micro switch may be provided in the direction of movement of the first table 51. When the limit switch or micro switch is triggered, the first drive assembly 53 is controlled to stop driving, thereby controlling the first table 51 to move within a specified range of motion. A limit switch or micro switch may be provided in the direction of movement of the second table 52. When the limit switch or micro switch is triggered, the second drive assembly 54 is controlled to stop driving, thereby controlling the second table 52 to move within a specified range of motion.

[0083] According to the conical slit device 100 and slit system of the above-described embodiment, the conical slit device 100 extends from the housing 1 to the small end surface 21 of the shield 2 via the bracket assembly 4. The drive assembly, through the bracket, drives the blade to move, forming an adjustable slit channel 30 at the opening of the small end surface 21 of the shield 2. This provides a slit channel 30 close to the curved surface for measuring curved samples, ensuring accurate sample measurement. The slit system's motion device can move the conical slit device 100 in front of the curved sample to adapt to the direction of the neutron beam and the position of the sample. Furthermore, the conical slit device 100 has a compact structure and can accommodate a variety of complex curved surface measurements.

[0084] The slit system provided in this application has at least the following significant features, making it more suitable for measurement requirements than traditional planar slits.

[0085] 1. The slit channel 30 of the tapered slit device 100 is continuously adjustable and can be adjusted according to the size of the sample to be measured.

[0086] 2. The conical slit device 100 is close to the sample when in use and is easily damaged by the sample. Generally, the conical slit device 100 is moved to a position away from the sample when installing the sample. The conical slit device 100 is driven by a motion device to move in front of the sample. The motion device can ensure the overall motion accuracy of the slit. Existing slit motion mechanisms generally use a crank slider mechanism to directly rotate the slit to a certain position, but its repeatability is relatively poor. The slit was close to the sample the previous time, but it may collide with the sample the next time. The motion device of this application uses a guide rail mechanism to move the entire device to a safer place and ensure high repeatability.

[0087] 3. In the present application, the motion device is connected to the tapered slit device 100 via a universal joint 242, which can act as a buffer when the tapered slit device 100 collides with the sample, thereby playing a role in preventing collisions.

[0088] 4. In this application, the blade of blade assembly 3 adopts enriched 10 Material B only needs 3mm thickness to achieve good neutron absorption.

[0089] This document is described with reference to various exemplary embodiments. However, those skilled in the art will recognize that changes and modifications may be made to the exemplary embodiments without departing from the scope of this document. For example, the various operational steps and components used to perform the operational steps may be implemented in different ways (e.g., one or more steps may be deleted, modified, or incorporated into other steps) depending on the specific application or considering any number of cost functions associated with the operation of the system.

[0090] Although the principles of this invention have been shown in various embodiments, many modifications of structure, arrangement, proportion, elements, materials and components that are particularly suitable for specific environments and operational requirements can be used without departing from the principles and scope of this invention. The above modifications and other changes or amendments are intended to be included within the scope of this invention.

[0091] The foregoing detailed description has been described with reference to various embodiments. However, those skilled in the art will recognize that various modifications and changes can be made without departing from the scope of this disclosure. Therefore, the present disclosure will be considered in an illustrative rather than a restrictive sense, and all such modifications will be included within its scope. Similarly, the advantages, other advantages and solutions to the problems of the various embodiments have been described above. However, the benefits, advantages, solutions to the problems and any elements that can produce these, or make them more specific, should not be interpreted as critical, required or necessary. The term "comprising" and any other variants used in this article are all non-exclusive inclusions, so that a process, method, article or device that includes a list of elements includes not only these elements, but also other elements that are not explicitly listed or do not belong to the process, method, system, article or device. In addition, the term "coupled" and any other variants used in this article refer to physical connections, electrical connections, magnetic connections, optical connections, communication connections, functional connections and / or any other connections.

[0092] Those skilled in the art will recognize that many changes can be made to the details of the above embodiments without departing from the basic principles of the invention. Therefore, the scope of the present invention should be determined solely by the claims.

Claims

1. A tapered slit device, characterized in that: include: A housing (1), a guard (2), a blade assembly (3), a bracket assembly (4), and a driving component (5); The driving component (5) is arranged in the housing (1); the shield (2) is mounted on the housing (1); the blade assembly (3) and the bracket assembly (4) are located in the shield (2); the shield (2) is tapered and has an opening on its small end surface (21); The bracket assembly (4) includes two first brackets (41) and two second brackets (42); the blade assembly (3) includes two first blades (31) and two second blades (32); the first blades (31) are mounted on the first bracket (41), and the second blades (32) are mounted on the second bracket (42); the two first blades (31) and the two second blades (32) overlap to form a slit channel (30), and the slit channel (30) faces the opening of the small end surface (21) of the shield (2); The driving component (5) is configured to drive the two first blades (31) to move relative to each other along a first preset direction via the first bracket (41), so as to change the width of the slit channel (30) in the first preset direction; the driving component (5) is further configured to drive the two second blades (32) to move relative to each other along a second preset direction via the second bracket (42), so as to change the height of the slit channel (30) in the second preset direction.

2. The tapered slit device according to claim 1, wherein: The driving component (5) comprises a base (50), two first tables (51), two second tables (52), two first driving assemblies (53) and two second driving assemblies (54); one first bracket (41) is correspondingly mounted on one first table (51), and one second bracket (42) is correspondingly mounted on one second table (52); one first driving assembly (53) is correspondingly arranged on one first table (51), and one second driving assembly (54) is correspondingly arranged on one second table (52); The first driving assembly (53) is used to drive the first table (51) to move in a first preset direction relative to the base (50), and the first blade (31) moves following the first table (51) via the first bracket (41); The second driving assembly (54) is used to drive the second table (52) to move in a second preset direction relative to the base (50), and the second blade (32) moves following the second table (52) via the second bracket (42).

3. The tapered slit device according to claim 2, wherein: The first end of the first bracket (41) is connected to the first table (51), and the distance between the two first ends of the two first brackets (41) is greater than the distance between the two second ends; The first end of the second bracket (42) is connected to the second table (52), and the distance between the two first ends of the two second brackets (42) is greater than the distance between the two second ends.

4. The tapered slit device according to claim 2, wherein: The driving component (5) further comprises two first measuring components (55) and two second measuring components (56), wherein one first measuring component (55) is provided corresponding to one first table (51), and one second measuring component (56) is provided corresponding to one second table (52); The first measuring component (55) is used to measure a first distance that the first table (51) moves relative to the base (50); The second measuring component (56) is used to measure a second distance that the second table (52) moves relative to the base (50).

5. The tapered slit device according to claim 4, wherein: The first measuring component (55) is a metrological grating, one of a reading head and a grating ruler of the first measuring component (55) is mounted on the base (50), and the other is mounted on the first table (51); And / or, the second measuring component (56) is a metrological grating, one of the reading head and the grating ruler of the second measuring component (56) is mounted on the base (50), and the other is mounted on the second table (52).

6. The tapered slit device according to claim 2, wherein: The driving component (5) further comprises two first sliding assemblies (57), each of the first tabletops (51) is slidably connected to the base (50) via the two first sliding assemblies (57), and the sliding direction is a first preset direction; And / or, the driving component (5) further includes two second sliding assemblies (58), each second table (52) is slidably connected to the base (50) via the two second sliding assemblies (58), and the sliding direction is a second preset direction.

7. The tapered slit device according to any one of claims 2 to 6, wherein: The two first drive assemblies (53) are located on a first surface of the base (50), and the two second drive assemblies (54) are located on a second surface of the base (50) opposite to the first surface.

8. The tapered slit device according to claim 7, wherein: The two first tables (51) are centrally symmetrically arranged on the base (50), and / or the two first drive assemblies (53) are centrally symmetrically arranged on the base (50); And / or, the two second tabletops (52) are centrally symmetrically arranged on the base (50), and / or, the two second drive assemblies (54) are centrally symmetrically arranged on the base (50).

9. The tapered slit device according to any one of claims 2 to 6, wherein: The first drive assembly (53) includes a linear motor, and the linear motor of the first drive assembly (53) is fixed relative to the first table (51); And / or, the second drive assembly (54) includes a linear motor, and the linear motor of the second drive assembly (54) is fixed relative to the base (50).

10. A slot system, characterized in that: include: A motion device and a tapered slit device (100) according to any one of claims 1 to 9; The motion device is used to drive the conical slit device (100) to move along a second preset direction and a third preset direction, the third preset direction being perpendicular to the second preset direction; The motion device comprises a base plate (210), a first motion system (220), a second motion system (230), and a switching assembly (240); the housing (1) of the conical slit device (100) is connected to the second motion system (230) via the switching assembly (240); and the second motion system (230) is used to drive the conical slit device (100) to move along the second preset direction; The second motion system (230) is connected to the base plate (210) via the first motion system (220); the first motion system (220) is used to drive the second motion system (230) to move along the third preset direction; and the conical slit device (100) follows the second motion system (230) to move along the third preset direction.

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