Adjustable X-ray central light beam shielding device

Abstract

The utility model provides an adjustable X-ray central light beam shielding device which comprises a light beam shielding block capable of shielding passing X-rays; an included angle is formed between the extension directions of the adjacent ropes, and one end of each rope is connected to the light beam shielding block; one end of each rope is connected with the light beam shielding block, the other end of each rope is connected with the corresponding winding mechanism, the winding mechanisms wind and unwind the connected ropes, and the ropes pull the light beam shielding block, so that the light beam shielding block has multiple translational degrees of freedom in the same space plane. Therefore, the light beam shielding block capable of adjusting the spatial position of the light beam shielding block can shield a part of X-rays, so that the detector is protected from radiation damage. And meanwhile, the rope can also avoid excessive shielding, so that the negative influence on a diffraction pattern in the X-ray is reduced, and the accuracy and the reliability of X-ray diffraction are ensured.

Description

Technical Field

[0001] The present application relates to the field of X-ray devices, and in particular to an adjustable X-ray central beam blocker. Background Art

[0002] X-ray diffraction (XRD) technology has a wide range of applications in materials science, solid state physics, chemistry and other fields. It is mainly used to study important information such as the crystal structure, lattice parameters and phase change of materials. For medical research, X-ray diffraction imaging technology can more clearly distinguish different pathological tissues, thereby assisting in diagnosis. In industrial production, X-ray diffraction imaging technology can detect the crystal structure of the workpiece produced, thereby obtaining the crystallographic information inside the workpiece, thereby detecting the quality and performance of the product, and can be used to optimize the production process. For example, the detection of cutting-edge metal additive manufacturing samples can optimize the additive processing technology. In materials research, X-ray diffraction imaging technology can detect the crystallographic information of new materials and assist in the development of higher performance materials. For example, the detection of lithium battery cells, the detection of strong magnets, the detection of metamaterials, the detection of new ceramic materials, the detection of new aerospace materials, etc.

[0003] In XRD experiments, the surface array detector is a crucial component, whose function is to receive and record the diffraction pattern produced by the interaction of X-rays with the sample.

[0004] The diffraction signal of X-rays is often a low-intensity large scattering angle signal, so in actual detection, a long exposure time is required to ensure the quality of the signal. The high-intensity transmission X-ray signal is not only of no application value in some application scenarios, but also causes radiation damage to the center of the detector under long-term exposure, which will reduce the sensitivity and performance of the detector, and even cause the detector to fail. In order to solve this problem, the traditional method is to set a shielding device at the center position of the detector array surface to reduce the direct exposure of the X-ray transmission signal. However, the traditional fixed shielding device is generally connected by a relatively sturdy rigid support, which may also have some problems. For example, the rigid support may cause excessive shielding of the area of ​​the detector that does not need to be shielded, thereby affecting the diffraction pattern, and the position cannot be flexibly adjusted.

[0005] The Chinese utility model patent with the announcement number "CN220360424U" discloses "a medical X-ray beam limiter and a medical X-ray detection device". This utility model patent uses a transmission unit to drive the X-ray shielding plate to move along a preset direction. Its transmission unit is a screw and nut structure, which belongs to the rigid connection mentioned above and is also prone to excessive shielding of X-rays. Utility Model Content

[0006] This application is made in view of the above-mentioned state of the prior art. The purpose of this application is to provide an adjustable X-ray central beam blocker.

[0007] The technical solution adopted by the present application to solve its technical problems is: an adjustable X-ray central beam blocker includes: a beam blocking block capable of blocking passing X-rays; a plurality of ropes, the extension directions of adjacent ropes forming an angle with each other, one end of the ropes being connected to the beam blocking block; and a plurality of winding mechanisms, the other ends of the ropes being respectively connected to the winding mechanisms, the winding mechanisms retract and release the connected ropes, the ropes pulling the beam blocking block, so that the beam blocking block has multiple translational degrees of freedom in the same spatial plane.

[0008] As a further improvement of the present application, the number of the ropes and the winding mechanisms are both four; one end of the rope connected to the beam blocking block is the front end of the rope, the extension directions of the front end of the rope coincide with the same spatial plane, and the extension directions of the front end of the rope are perpendicular to each other.

[0009] As a further improvement of the present application, the rope is a nylon wire with a diameter of 0.1 mm to 0.3 mm.

[0010] As a further improvement of the present application, the adjustable X-ray central beam blocker also includes a device frame, the winding mechanism includes a stepper motor, the stepper motor is fixed to the device frame, and the device frame is provided with a fixed pulley for changing the extension direction of the rope.

[0011] As a further improvement of the present application, two laser rangefinders are further arranged on the device frame, and each of the two laser rangefinders points to the beam blocking block, and the directions of the two laser rangefinders are perpendicular to each other.

[0012] As a further improvement of the present application, the adjustable X-ray central beam blocker also includes a control and power supply integrated module, and the stepper motor and the laser rangefinder are each connected to the control and power supply integrated module via a cable.

[0013] As a further improvement of the present application, the output shaft of the stepper motor is connected to a worm, the worm is connected to a worm wheel, and the worm wheel winds the rope; one end of the rope entering the worm wheel is also clamped by rollers, and the rollers are symmetrically arranged on both sides of the rope, and the rollers located on both sides of the rope rotate in opposite directions.

[0014] As a further improvement of the present application, the beam blocking block includes a replaceable blocking block and a fixed block which are detachably assembled with each other, the fixed block is directly connected to the rope, and when observed in a direction perpendicular to the translation direction of the fixed block, the area of ​​the replaceable blocking block is larger than the area of ​​the fixed block.

[0015] As a further improvement of the present application, the replaceable shielding block and the fixed block are detachably assembled via magnets.

[0016] As a further improvement of the present application, when observed from a perspective perpendicular to the plane in which the fixed block translates, the outline of the replaceable shielding block is circular or rectangular; the connection point between the rope and the fixed block and the center of mass of the replaceable shielding block, the fixed block and the magnet as a whole are in the same spatial plane.

[0017] The adjustable X-ray central beam blocker of the present application has the following beneficial effects: first, the beam block can block a part of the X-rays and protect the detector from radiation damage. Secondly, the beam block has the mechanical freedom of movement. By fine-tuning the actual spatial position of the beam block, it can adapt to detectors of different specifications, different X-rays, and different diffraction experimental requirements. Thirdly, the movement of the beam block is achieved by pulling the rope with the help of a winding mechanism. Several ropes are arranged at an angle to each other. The beam block can be moved to the specified position only when the ropes are retracted and released. The interaction of several ropes enables the beam block to have sufficient translational freedom. Finally, ropes are used to fix and pull the beam block. The ropes are generally strong in tensile strength and their own diameter can also be very small. When fixing a beam block of the same specification, the rigid support structure of the fixed beam block in the traditional technology often needs to have sufficient pressure resistance and bending resistance, so the rigid support structure in the traditional technology is inherently thicker and it is difficult to be thinner than the rope. The relatively thin rope, due to its small size, can reduce excessive obstruction of X-rays and reduce the negative impact on the diffraction pattern of X-rays, thereby ensuring the accuracy and reliability of X-ray diffraction. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 is a structural schematic diagram of an embodiment of an adjustable X-ray central beam blocker according to the present application;

[0020] Figure 2It is a structural schematic diagram of an embodiment of the winding mechanism of the present application;

[0021] Figure 3 It is a front view of an embodiment of the beam blocking block of the present application;

[0022] Figure 4 It is a side view of an embodiment of the beam blocking block of the present application.

[0023] Description of Reference Numerals

[0024] 1-device base; 2-winding mechanism; 21-mechanism housing; 22-roller; 23-worm gear; 24-worm; 25-stepping motor; 26-stepping motor connecting line; 3-device frame; 4-placing table; 5-laser rangefinder; 6-beam blocking block; 61-replaceable blocking block; 62-fixed block; 63-magnet; 7-surface array detector; 8-rope; 9-control and power supply integrated module. DETAILED DESCRIPTION

[0025] The adjustable X-ray central beam blocker of the present application is further described in detail below with reference to the accompanying drawings. It should be understood that these specific descriptions are only used to teach those skilled in the art how to implement the present application, and are not intended to exhaust all feasible methods of the present application, nor to limit the scope of the present application.

[0026] like Figure 1 As shown, the embodiment of the present application is to design an adjustable X-ray central beam blocker that can be installed in front of the detector. Figure 1 The propagation direction of the central X-ray has been marked in the figure, which is perpendicular to the paper surface. The shielding device uses a high-strength rope 8 to fix the beam blocking block 6, and the beam blocking block 6 is used to block the beam of the central high-intensity X-ray. The beam blocking block 6 can be a metal sheet, and the rope 8 can be a nylon wire with a diameter of 0.1mm to 0.3mm. One end of several ropes 8 is connected to the beam blocking block 6, and the other ends of several ropes 8 are respectively fixed on the winding mechanism 2. The winding mechanism 2 can include a winch, which is driven by a stepper motor 25, and then each stepper motor 25 controls a rope 8 to achieve the length of the rope 8 to be retracted or released, thereby changing the spatial position of the beam blocking block 6.

[0027] The shielding piece can be fixed with an ultra-thin and high-strength nylon line. The rope 8 provides sufficient tensile strength while the rope 8 itself is very small, which can avoid the problem of excessive X-ray shielding by the rigid fixing device for fixing the beam shielding block 6 in the prior art. The length of the rope 8 can be adjusted by the stepper motor 25, so that the rope 8 can be accurately adjusted, and then the spatial position of the beam shielding block 6 can be accurately adjusted.

[0028] In another embodiment, if Figure 1 As shown, the shield includes two sets of laser rangefinders 5, each of which points to the beam shielding block 6, and each of which points perpendicularly to each other. The stepper motor 25 and the laser rangefinder 5 are each connected to the control and power supply integrated module 9 through, for example, a cable, and the laser rangefinder 5 is used to sense the position of the beam shielding block 6 in real time, thereby facilitating the stepper motor 25 to make corresponding adjustments. Figure 2 The cable of the stepper motor 25, i.e., a part of the stepper motor connection line 26 is shown. The control and power supply integrated module 9 can provide the laser rangefinder 5 and the stepper motor 25 with the power required for operation, and also receive the data information fed back by the laser rangefinder 5, and control the action of each stepper motor 25 accordingly.

[0029] The laser rangefinder 5 is used to monitor the spatial position of the beam blocking block 6, which can further improve the positioning accuracy of the beam blocking block 6. Here, in a non-limiting manner, human-machine interaction can also be achieved through a human-machine interface device such as a display device.

[0030] In another embodiment, if Figure 2 As shown, the output shaft of the stepper motor 25 is connected to the worm 24. Here, as an example, the end of the output shaft of the stepper motor 25 can be integrally fixed coaxially with the end of the worm 24, or the output shaft of the stepper motor 25 and the worm 24 can be parallel to each other and in the form of gear meshing or belt transmission. In short, the output shaft of the stepper motor 25 drives the worm 24 to rotate around the axis of the worm 24. The worm 24 is connected to the worm wheel 23, and the worm wheel 23 can be integrally fixed coaxially with a capstan, and then the rope 8 is wound. The end of the rope 8 entering the worm wheel 23 is also clamped by the roller 22, and the rollers 22 are symmetrically arranged on both sides of the rope 8, and the rollers 22 located on both sides of the rope 8 respectively rotate in opposite directions. The roller 22 plays an auxiliary feeding role for the rope 8, avoiding the rope 8 near the roller 22 from shaking and displacing, thereby facilitating the winding of the rope 8 by the capstan. In addition, as Figure 2 As shown, the winding mechanism 2 may further include a mechanism housing 21 , which accommodates the roller 22 , the worm gear 23 , the worm 24 , and the stepping motor 25 .

[0031] When the stepper motor 25 rotates, it can drive the capstan to rotate, and then realize the winding of the rope 8, so as to adjust the exposed length of the rope 8. The meshing of the worm 24 and the worm wheel 23 can effectively prevent the stepper motor 25 from being reversed when the tension of the rope 8 is large, because the characteristic of the worm gear mechanism is that the reverse resistance is large, so it is equivalent to having an anti-reverse protection function.

[0032] In another embodiment, if Figure 1As shown, the winding mechanism 2 is fixed to the device frame 3. The bottom of the device frame 3 is the device base 1. A placement table 4 is provided on the side of the device frame 3, and the placement table 4 is used to place the winding mechanism 2. Two sets of laser rangefinders 5 are respectively fixed on the top and side of the device frame 3. In addition, the device frame 3 may be provided with a small hole for the rope 8 to pass freely, such as Figure 1 As shown, when the rope 8 passes through the small hole of the device frame 3, the small hole divides the rope 8 into two sections with obtuse angles to each other, thus ensuring that the friction between the rope 8 and the inner wall of the small hole is not too large. A fixed pulley can also be installed on the device frame 3, and the rope 8 is in active contact with the fixed pulley, and the fixed pulley changes the direction of the rope 8. The hollow position in the middle of the device frame 3 is for the surface array detector 7 to be placed. Along the direction of the X-ray beam, the beam blocking block 6 overlaps with the projection of the surface array detector 7; along the direction of the X-ray beam, the beam blocking block 6 can be coincident with the centroid of the surface array detector 7.

[0033] The device frame 3 of different sizes can be selected according to the size of the surface array detector 7 to ensure that the device frame 3 does not block the surface array detector 7. The beam blocking block 6 is located between the ray source and the surface array detector 7, and the beam blocking block 6 can block the X-ray center beam; the beam blocking block 6 is fixed by a plurality of high-strength thin wires and suspended in the center of the device frame 3, and can block the strong X-ray beam in the center of the surface array detector 7, thereby protecting the surface array detector 7 from damage by excessive X-rays.

[0034] The number of ropes 8 as high-strength thin wires can be four, and the other ends of the four ropes 8 can be fixed in the winding mechanism 2; the four winding mechanisms 2 can respectively adjust the exposed lengths of the four ropes 8, thereby further adjusting the spatial position of the beam blocking block 6. One end of the rope 8 connected to the beam blocking block 6 is the front end of the rope, and the extension direction of the front end of the rope can coincide with the same spatial plane. Figure 3 It can also be seen that the extension directions of the front ends of the two adjacent ropes around the beam shielding block 6 are perpendicular to each other, that is, the angles between the two adjacent ropes 8 around the beam shielding block 6 are all 90° right angles, so the beam shielding block 6 has at least two translational degrees of freedom in a spatial plane. Two of the four winding mechanisms 2 can be fixed on the placement table 4, and two can be fixed on the device base 1; the control and power supply integrated module 9 connects the four winding mechanisms 2 and the two sets of laser rangefinders 5, and the control and power supply integrated module 9 can also be connected to a computer for user convenience.

[0035] In another embodiment, the beam blocking block 6 includes a replaceable blocking block 61 and a fixed block 62 which are detachably assembled with each other. The fixed block 62 is directly connected to the rope 8. Along the direction perpendicular to the translation direction of the fixed block 62, the projection area of ​​the replaceable blocking block 61 is larger than the projection area of ​​the fixed block 62.

[0036] In another embodiment, if Figure 4 As shown, the replaceable shielding block 61 and the fixed block 62 are detachably assembled through a magnet 63. The magnet 63 can be an electromagnet or a permanent magnet. Figure 4 The propagation direction of the X-rays has been marked in the figure, which is from the left to the right.

[0037] like Figure 3 As shown, the replaceable shielding block 61 is relatively large in size, and the fixed block 62 is extremely small in size. Figure 3 The propagation direction of the X-ray has been marked in the figure, which is perpendicular to the paper surface. The replaceable shielding block 61 can be tightly locked with the fixed block 62 by the magnetic attraction of the magnet 63. The magnetic attraction assembly form of the magnet 63 makes the removal efficiency higher. The fixed block 62 is connected to four ropes 8. The replaceable shielding block 61 can have multiple sizes, shapes, thicknesses and materials to choose from. The replaceable shielding block 61 of different shapes and sizes can be replaced according to actual needs. The replaceable shielding block 61 can have sufficient density and thickness to have sufficient blocking ability for X-rays.

[0038] In another embodiment, when viewed along the propagation direction of the X-rays, the outline of the replaceable shielding block 61 may be circular or rectangular. Figure 3 The outline of the replaceable blocking block 61 in FIG. 6 is circular.

[0039] In another embodiment, the connection point between the rope 8 and the fixed block 62 and the center of mass of the replaceable shielding block 61, the fixed block 62 and the magnet 63 are in the same spatial plane. Figure 1 As shown, the extension direction of the rope 8, the center of mass of the replaceable blocking block 61, the fixed block 62, and the magnet 63 can be coincident with the same vertical plane in space, and one end of each rope 8 forms an angle of 45° with the horizontal plane, so that the rope 8 is almost only subjected to tension, so the beam blocking block 6 is not easy to tilt.

[0040] Here, the number of the magnet 63 may be one or more.

[0041] In the use state, the specific operation steps of the obstruction device are as follows: First, the user selects a replaceable obstruction block 61 of different shapes or sizes according to actual needs and installs it on the fixed block 62. Next, start the power supply of the obstruction device, connect the obstruction device to the computer, and input the desired position parameters of the beam obstruction block 6 according to actual needs. Then, the laser rangefinder 5 detects the real-time position of the beam obstruction block 6 and transmits the signal to the control and power supply integrated module 9. Then, the control and power supply integrated module 9 controls the stepper motor 25 to run and adjust the position of the beam obstruction block 6 according to the current actual position information of the beam obstruction block 6 and the user's desired position information of the beam obstruction block 6. The two sets of laser rangefinders 5 also detect the position information of the beam obstruction block 6 in real time and display it on the software interface of the computer. Finally, after the beam obstruction block 6 reaches the specified position, the control and power supply integrated module 9 controls the stepper motor 25 to stop working, and the spatial position of the beam obstruction block 6 is locked, and subsequent diffraction experiments or tests can be carried out.

[0042] The above embodiments are only for illustrating the technical concept and features of the present application, and their purpose is to enable people familiar with this technology to understand the content of the present application and implement it. They cannot be used to limit the scope of protection of the present application. All equivalent changes or modifications made according to the spirit of the present application should be included in the scope of protection of the present application.

Claims

1. An adjustable X-ray central beam blocker, characterized in that: include: A beam block that can block the passing X-rays; A plurality of ropes, wherein the extending directions of adjacent ropes form an angle with each other, and one end of each rope is connected to the beam blocking block; as well as A plurality of winding mechanisms, the other ends of the ropes are respectively connected to the winding mechanisms, the winding mechanisms are used to retract and release the connected ropes, and the ropes pull the beam blocking block, so that the beam blocking block has multiple translational degrees of freedom in the same spatial plane.

2. The adjustable X-ray central beam blocker according to claim 1, characterized in that: The number of the ropes and the number of the winding mechanisms are both four; One end of the rope connected to the beam blocking block is the front end of the rope, the extension directions of the front end of the rope coincide with the same spatial plane, and the extension directions of the front end of the rope are perpendicular to each other.

3. The adjustable X-ray central beam blocker according to claim 1, characterized in that: The rope is a nylon line with a diameter of 0.1 mm to 0.3 mm.

4. The adjustable X-ray central beam blocker according to claim 1, characterized in that: The adjustable X-ray central beam blocker also includes a device frame, the winding mechanism includes a stepping motor, the stepping motor is fixed to the device frame, and the device frame is provided with a fixed pulley for changing the extension direction of the rope.

5. The adjustable X-ray central beam blocker according to claim 4, characterized in that: Two laser rangefinders are also arranged on the device frame. The two laser rangefinders each point to the beam blocking block, and the directions of the two laser rangefinders are perpendicular to each other.

6. The adjustable X-ray central beam blocker according to claim 5, characterized in that: The adjustable X-ray central beam blocker also includes a control and power supply integrated module, and the stepper motor and the laser rangefinder are each connected to the control and power supply integrated module via a cable.

7. The adjustable X-ray central beam blocker according to claim 4, characterized in that: The output shaft of the stepper motor is connected to a worm, the worm is connected to a worm wheel, and the worm wheel winds the rope; One end of the rope entering the worm gear is also clamped by rollers, and the rollers are symmetrically arranged on both sides of the rope, and the rollers located on both sides of the rope rotate in opposite directions.

8. The adjustable X-ray central beam blocker according to claim 1, characterized in that: The beam blocking block includes a replaceable blocking block and a fixed block which are detachably assembled with each other. The fixed block is directly connected to the rope. When observed in a direction perpendicular to the translation direction of the fixed block, the area of ​​the replaceable blocking block is larger than that of the fixed block.

9. The adjustable X-ray central beam blocker according to claim 8, characterized in that: The replaceable shielding block and the fixed block are detachably assembled via magnets.

10. The adjustable X-ray central beam blocker according to claim 9, characterized in that: When observed from a viewing angle perpendicular to the plane where the fixed block translates, the outline of the replaceable shielding block is circular or rectangular; The connection point between the rope and the fixed block and the center of mass of the replaceable shielding block, the fixed block and the magnet are in the same spatial plane.

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