Switching device for X-ray detection equipment and X-ray detection equipment

Abstract

The invention discloses a switch device for X-ray detection equipment and the X-ray detection equipment, and the switch device comprises a pipeline assembly which comprises a light inlet and a light outlet which are arranged at the two ends; the X-ray shielding piece is arranged in the pipeline assembly in a sleeved mode, and a through hole penetrating through the X-ray shielding piece is formed in the center of the X-ray shielding piece; the blocking piece assembly is movably arranged at the end, close to the light outlet, of the through hole so as to open or shield the through hole. When the through hole is shielded by the blocking piece assembly, secondary X-rays generated by the X-rays penetrating through the through hole and irradiating on the blocking piece irradiate to the inner wall of the through hole and / or penetrate through the light inlet and irradiate to the X light source shielding chamber. According to the switching device, the X-ray beam blocking function is maintained, and meanwhile, the X-ray shielding piece has the protection capability on lateral secondary X-ray radiation.

Description

Technical Field

[0001] The present application relates to the technical field of detection equipment, and in particular to a switch device for X-ray detection equipment and the X-ray detection equipment. Background Art

[0002] X-ray detection equipment such as X-ray fluorescence spectrometer (XRF), X-ray diffractometer (XRD), and X-ray small angle scattering (SAXS) use X-ray excitation sources. When they are irradiated to the sample, they will interact with the material in a complex manner, thereby generating a variety of physical signals such as diffraction, scattering, and fluorescence. The precise detection and analysis of these signals provide a powerful means for industrial quality inspection, material structure analysis, biomedicine, and other fields. X-rays are electromagnetic waves with a wavelength between 0.01-100nm, which have strong penetrability and can cause great harm to human health. However, X-ray detection equipment requires a high-throughput X-ray source to improve the sensitivity of the instrument, and in different application scenarios, X-rays with shorter wavelengths and stronger penetration are often used, further increasing the safety hazards caused by X-ray irradiation and leakage. Therefore, X-ray detection equipment is equipped with X-ray beam blockers and radiation shielding devices to reduce radiation doses, providing convenience and safety for operators and instruments.

[0003] Figure 1 This is a schematic diagram of the structure of an existing X-ray detection device. The light emitted by the X-ray light source is guided to the position of the sample to be tested through the X-ray transmission optical path, and the signal generated by the sample is excited and enters the detector through the signal transmission optical path. An X-ray switch and a radiation shielding chamber are arranged on the X-ray transmission optical path. Figure 2 The schematic diagram of the structure of the existing X-ray switch is a key component for opening and closing the X-ray beam. The baffle made of tungsten or other high-density materials is controlled by a precision drive system to achieve precise control of the ray beam. It is opened to allow the rays to pass through, and closed to block the rays. When the X-ray switch is in the open state, since the beam is a parallel or focused beam, there is no irradiation and interaction with the X-ray switch baffle and the side wall of the structure on the X-ray propagation path. At this time, there is no radiation leakage risk in the vacuum X-ray switch section; when the switch is in the closed state, the X-ray beam reaches the shielding baffle. In addition to being absorbed and attenuated, it will also produce secondary X-rays such as large-angle parasitic scattering and fluorescence with strong penetrating power, causing serious radiation leakage. The design of the existing X-ray switch only considers blocking the direct beam, but ignores the shielding of secondary X-rays. In order to eliminate the risk of secondary X-ray radiation leakage, an X-ray switch shielding room needs to be set outside the main structure of the X-ray switch, but this method not only increases the difficulty of system design and the risk of radiation leakage, but also reduces the convenience, flexibility and safety of the equipment. Summary of the invention

[0004] In view of this, the present application provides a switch device for X-ray detection equipment and X-ray detection equipment to solve the problem that the switch device of the existing X-ray detection equipment does not have the ability to eliminate secondary X-ray radiation and has radiation leakage.

[0005] In order to solve the above technical problems, a technical solution adopted in the present application is: to provide a switch device for X-ray detection equipment, which includes: a pipeline assembly, the pipeline assembly includes a light inlet and a light outlet arranged at both ends; an X-ray shielding component, the X-ray shielding component is sleeved in the pipeline assembly, and a circular through hole penetrating the X-ray shielding component is arranged at the center of the X-ray shielding component; a baffle assembly, the baffle assembly is movably arranged at one end of the circular through hole close to the light outlet to open or block the circular through hole; when the baffle assembly blocks the circular through hole, the secondary X-rays generated by the X-rays passing through the circular through hole and irradiating the baffle are irradiated to the inner wall of the circular through hole and / or pass through the light inlet to irradiate the X-ray light source shielding room.

[0006] As a further improvement of the present application, the pipeline assembly includes a vacuum tube, and a first connecting member and a second connecting member respectively arranged at both ends of the vacuum tube, the first connecting member is used to connect to the window of the X-ray source shielding room, and the second connecting member is used to connect to the window of the detector shielding room.

[0007] As a further improvement of the present application, the X-ray shielding component includes a shielding cylinder made of a metal material with a strong X-ray absorption capability, and the outer side surface of the shielding cylinder is in close contact with the inner wall of the pipeline assembly.

[0008] As a further improvement of the present application, the maximum distance from the center of the through hole to the inner wall of the through hole, the length of the through hole, the diameter of the pipe assembly, and the distance from the end of the through hole close to the light inlet to the light inlet are all pre-set, so that among the secondary X-rays generated by the X-rays irradiated on the baffle, with the X-ray propagation direction as a reference, the secondary X-rays that meet the first propagation angle are irradiated to the inner wall of the through hole, and the secondary X-rays that meet the second propagation angle pass through the light inlet and propagate to the X-ray source shielding room.

[0009] As a further improvement of the present application, the first propagation angle and the second propagation angle are determined based on the maximum distance from the center of the through hole to the inner wall of the through hole and the length of the through hole. The first propagation angle is expressed as: and The second propagation angle is expressed as: Wherein, A represents the maximum distance from the center of the through hole to the inner wall of the through hole, and B represents the length of the through hole.

[0010] As a further improvement of the present application, the maximum distance from the center of the through hole to the inner wall of the through hole, the length of the through hole, the diameter of the pipeline assembly, and the distance from one end of the through hole close to the light inlet to the light inlet satisfy the following relationship: Wherein, C represents the distance from the end of the through hole close to the light inlet to the light inlet, and D represents the diameter of the pipeline assembly.

[0011] As a further improvement of the present application, the through hole is a circular through hole, and the maximum distance from the center of the through hole to the inner wall of the through hole is the radius of the circular through hole.

[0012] As a further improvement of the present application, the baffle assembly includes a baffle and a baffle driving system. The baffle is movably arranged at one end of the through hole close to the light outlet. The output end of the baffle driving system is connected to the baffle. The diameter of the baffle is larger than the diameter of the through hole. The baffle driving system drives the baffle according to external input instructions to open or block the through hole.

[0013] As a further improvement of the present application, one end of the X-ray shielding member adjacent to the baffle is arranged as a groove, the baffle is movably arranged in the groove, and the baffle and the X-ray shielding member are arranged at a preset distance.

[0014] As a further improvement of the present application, the depth of the groove is greater than the preset distance.

[0015] In order to solve the above-mentioned technical problems, another technical solution adopted in the present application is: to provide an X-ray detection device, which includes an X-ray light source, an X-ray light source shielding room and one of the above-mentioned switch devices for X-ray detection equipment, the X-ray light source is arranged in the X-ray light source shielding room, a window is arranged on the X-ray light source shielding room, and the light inlet of the switch device is connected to the window.

[0016] The beneficial effect of the present application is that the switch device for X-ray detection equipment of the present application arranges an X-ray shielding component in the pipeline assembly, and arranges a through hole in the X-ray shielding component to provide a propagation light path for the X-rays. When the baffle assembly blocks the through hole, among the secondary X-rays propagating to various angles generated by the X-ray irradiation on the baffle assembly, the secondary X-rays irradiating the inner wall of the through hole are absorbed by the X-ray shielding component, and the secondary X-rays reflected to the outside of the through hole pass through the light inlet and return to the X-ray light source shielding room. It can not only realize the control of the on and off of the X-ray light beam, but also avoid the secondary X-rays from irradiating the pipeline assembly with weak radiation protection ability, thereby reducing the risk of secondary X-ray leakage, and there is no need to design a bulky radiation shielding chamber for the switch device, thereby reducing the equipment manufacturing cost and improving the convenience and flexibility of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The schematic diagram of the structure of the existing X-ray detection equipment is shown;

[0018] Figure 2 The schematic diagram of the structure of the existing X-ray switch is shown;

[0019] Figure 3is a schematic structural diagram of a switch device for an X-ray detection device according to an embodiment of the present invention;

[0020] Figure 4 is a schematic diagram of the propagation angle of secondary X-rays of a switch device for an X-ray detection device according to an embodiment of the present invention;

[0021] Figure 5 It is a schematic structural diagram of an X-ray detection device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0023] The terms "first", "second", "third" in this application are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined as "first", "second", "third" can expressly or implicitly include at least one of the features. In the description of this application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. In the embodiments of this application, all directional indications (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication also changes accordingly. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the steps or units listed, but optionally also includes steps or units that are not listed, or optionally also includes other steps or units inherent to these processes, methods, products or devices.

[0024] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0025] Figure 3 Schematic diagram of the structure of a switch device for an X-ray detection device according to an embodiment of the present invention. Figure 3As shown, the switch device for X-ray detection equipment includes: a pipeline component 1, an X-ray shielding component 2 and a baffle component 3.

[0026] The pipeline assembly 1 includes a light inlet 1a and a light outlet 1b arranged at both ends. Specifically, the pipeline assembly 1 is mainly used to provide an optical path for X-rays and maintain a vacuum state in the pipeline assembly 1. It is usually made of stainless steel material and has poor radiation protection ability. The light inlet 1a is used to connect to the X-ray source shielding room, and the light outlet 1b is used to connect to the detector shielding room. The X-ray beam emitted by the X-ray source passes through the pipeline assembly 1 and irradiates the sample in the detector shielding room. It should be noted that the pipeline assembly 1 can also be set to a non-vacuum state, and the present invention is not limited thereto.

[0027] The X-ray shielding member 2 is sleeved in the pipeline assembly 1, and a through hole 21 penetrating the X-ray shielding member 2 is provided at the center of the X-ray shielding member 2. The X-ray shielding member 2 is made of a high-density material with a strong absorption capacity for X-rays, such as tungsten, tantalum, etc. The through hole 21 penetrating the X-ray shielding member 2 is located on the propagation optical path of the X-ray beam, and the propagation optical path of the X-ray beam preferably coincides with the center line of the through hole 21. It should be noted that the size of the through hole 21 can be designed according to the size of the X-ray beam.

[0028] The baffle assembly 3 is movably arranged at one end of the through hole 21 close to the light outlet 1b to open or block the through hole 21. The baffle assembly 3 is also made of a high-density material with a strong absorption capacity for X-rays, and is movably arranged on the propagation optical path of the X-rays to release or block the X-ray beam in the direction of the main optical path of the X-rays.

[0029] In this embodiment, when the baffle assembly 3 blocks the through hole 21, the secondary X-rays generated by the X-rays passing through the through hole 21 and irradiating the baffle are irradiated to the inner wall of the through hole 21 and / or pass through the light inlet 1a to irradiate the X-ray source shielding room. Specifically, when the X-ray source is working, the X-ray beam emitted by it passes through the light inlet 1a of the pipeline assembly 1 into the pipeline assembly 1, and then passes through the through hole 21. At this time, if the baffle assembly 3 does not block the through hole 21, the X-ray beam directly passes through the light outlet 1b of the pipeline assembly 1 and propagates to the detector shielding room to detect the sample; if the baffle assembly 3 blocks the through hole 21, the X-ray beam is irradiated on the baffle assembly 3. In addition to being absorbed and attenuated by the baffle assembly 3, secondary X-rays such as large-angle parasitic scattering and fluorescence with strong penetrating power will be generated. These secondary X-rays are either irradiated on the inner wall of the through hole 21 and absorbed by the X-ray shielding component 2, or emitted from the other end of the through hole 21 through the light inlet 1a of the pipeline assembly 1 and propagated to the X-ray light source shielding room, thereby avoiding leakage of secondary X-rays.

[0030] The switch device for X-ray detection equipment of this embodiment is achieved by arranging an X-ray shielding component 2 in the pipeline component 1, and arranging a through hole 21 in the X-ray shielding component 2 to provide a propagation light path for the X-rays. When the baffle component 3 blocks the through hole 21, among the secondary X-rays propagating to various angles generated by the X-rays irradiating the baffle component 3, the secondary X-rays irradiating the inner wall of the through hole 21 are absorbed by the X-ray shielding component 2, and the secondary X-rays reflected to the outside of the through hole 21 pass through the light inlet 1a and return to the X-ray light source shielding room. It can not only realize the control of the on and off of the X-ray beam, but also prevent the secondary X-rays from irradiating the pipeline component 1 with weak radiation protection ability, thereby reducing the risk of secondary X-ray leakage, and there is no need to design a bulky radiation shielding chamber for the switch device, thereby reducing the equipment manufacturing cost and improving the convenience and flexibility of the equipment.

[0031] Furthermore, in this embodiment, the pipeline assembly 1 includes a vacuum tube 11, and a first connecting member 12 and a second connecting member 13 respectively arranged at both ends of the vacuum tube 11, the first connecting member 12 is used to connect to the window of the X-ray source shielding room, and the second connecting member 13 is used to connect to the window of the detector shielding room.

[0032] Specifically, the first connector 12 and the second connector 13 are preferably flanges. It should be noted that the distance from the end of the through hole 21 close to the light inlet 1a to the light inlet 1a is the distance from the through hole 21 to the side of the flange. The flange cannot be irradiated by the secondary X-rays and there is a risk of radiation leakage.

[0033] Furthermore, the X-ray shielding component 2 comprises a shielding cylinder made of a metal material with a strong X-ray absorption capability, and the outer side surface of the shielding cylinder is in close contact with the inner wall of the pipeline assembly 1 .

[0034] Furthermore, in order to ensure that the secondary X-rays emitted from various angles can be absorbed by the X-ray shielding component 2 and / or propagate to the X-ray source shielding room, in this embodiment, the maximum distance from the center of the through hole 21 to the inner wall of the through hole and the length of the through hole, the diameter of the pipeline assembly 1, and the distance from the end of the through hole 21 close to the light inlet 1a to the light inlet 1a are all pre-set, so that among the secondary X-rays generated by the X-rays irradiated on the baffle, with the X-ray propagation direction as a reference, the secondary X-rays that meet the first propagation angle are irradiated to the inner wall of the through hole 21, and the secondary X-rays that meet the second propagation angle pass through the light inlet 1a and propagate to the X-ray source shielding room.

[0035] The first propagation angle and the second propagation angle are determined based on the maximum distance from the center of the through hole 21 to the inner wall of the through hole and the length of the through hole. The first propagation angle is expressed as: and The second propagation angle is expressed as: A represents the maximum distance from the center of the through hole 21 to the inner wall of the through hole, and B represents the length of the through hole 21 .

[0036] It should be understood that the shape of the through hole 21 is not limited in this embodiment, and any shape that can ensure the normal passage of X-rays is acceptable, that is, the propagation optical path of the X-rays should be within the through hole 21. In addition, for a through hole of a regular shape, the propagation optical path of the X-rays passes through its center point, such as a circle or a regular polygon, so the center of the through hole is the center of the circle or the center point of the regular polygon; while for an irregular shape, the center of the through hole in this embodiment refers to a point on the propagation optical path of the X-rays. Therefore, when calculating the first propagation angle and the second propagation angle, in order to ensure that the secondary X-rays emitted from the through hole 21 will not irradiate the pipeline component 1, this embodiment uses the maximum distance from the center of the through hole 21 to the inner wall of the through hole 21 as a reference. If the secondary X-rays emitted from the position corresponding to the maximum distance all meet the second propagation angle, the secondary X-rays emitted from any position of the baffle assembly 3 should also meet the second propagation angle, so that the secondary X-rays will not irradiate the pipeline component 1.

[0037] like Figure 4 As shown, the propagation optical path of the X-ray beam coincides with the center line of the pipeline component 1 and the center line of the through hole 21, and the size of the X-ray beam is usually much smaller than the distance between the center of the through hole 21 and the inner wall. Therefore, it can be understood that the point where the secondary X-ray is generated is mainly located at the point where the center line of the through hole 21 intersects with the baffle component 3. In order to ensure that the secondary X-ray is absorbed by the X-ray shielding component 2 and / or propagates to the X-ray source shielding room, the maximum distance from the center of the through hole 21 to the inner wall of the through hole and the length of the through hole, the diameter of the pipeline component 1, and the distance from one end of the through hole 21 close to the light inlet 1a to the light inlet 1a are set in this embodiment, so that the secondary X-ray is either absorbed by the X-ray shielding component 2 or propagates to the X-ray source shielding room, and will not be irradiated on the pipeline component 1 with poor radiation protection ability.

[0038] Specifically, this embodiment uses the X-ray propagation direction as a reference and calculates the critical angle between the secondary X-ray irradiated to the inner wall of the through hole 21 and the secondary X-ray propagated from the through hole 21 based on the inverse trigonometric function, which is expressed as That is, when the propagation angle is and When the propagation angle is When the secondary X-rays are emitted from the through hole 21, the diameter of the pipe assembly 1 and the distance from the end of the through hole 21 close to the light inlet 1a to the light inlet 1a are set so that the propagation angle is The secondary X-rays do not irradiate the pipeline assembly 1, but are directly transmitted from the light inlet 1a to the X-ray source shielding room, so the propagation angle is The secondary X-rays will also propagate from the light inlet 1a into the X-ray source shielding room.

[0039] The maximum distance and length from the center of the through hole 21 to the inner wall of the through hole, the diameter of the pipeline assembly 1, and the distance from one end of the through hole 21 close to the light inlet 1a to the light inlet 1a satisfy the following relationship:

[0040]

[0041] Wherein, C represents the distance from one end of the through hole 21 close to the light inlet 1 a to the light inlet 1 a , and D represents the diameter of the pipeline assembly 1 .

[0042] Specifically, first, this embodiment calculates the critical value of the distance from the end of the through hole 21 close to the light inlet 1a to the light inlet 1a for the secondary X-ray to propagate to the X-light source shielding, based on the distance from the end of the through hole 21 close to the light inlet 1a to the light inlet 1a, the diameter of the pipeline assembly 1, and the diameter and length of the through hole 21:

[0043]

[0044] get, Therefore, in order to prevent the secondary X-rays from irradiating the pipeline assembly 1, the diameter and length of the through hole 21, the diameter of the pipeline assembly 1, and the distance from the end of the through hole 21 close to the light inlet 1a to the light inlet 1a meet conditions.

[0045] Furthermore, in this embodiment, the through hole is a circular through hole, and the maximum distance from the center of the through hole to the inner wall of the through hole is the radius of the circular through hole.

[0046] Further, in this embodiment, if Figure 2 As shown, the baffle assembly 3 includes a baffle 31 and a baffle driving system 32. The baffle 31 is movably arranged at one end of the through hole 21 close to the light outlet 1b. The output end of the baffle driving system 32 is connected to the baffle 31. The diameter of the baffle 31 is larger than the diameter of the through hole 21. The baffle driving system 32 drives the baffle according to an external input instruction to open or block the through hole 21.

[0047] Specifically, the baffle driving system 32 includes a controller and a power output device. The controller is used to receive and execute external instructions, and the power output device is used to provide power for the movement of the baffle 31. By driving the baffle driving system 32, the baffle 31 can open or block the through hole 21.

[0048] Furthermore, in order to prevent wear between the baffle 31 and the X-ray shielding 2, which affects the service life of the baffle 31 and the X-ray shielding 2 and the radiation shielding effect, on the basis of the above embodiments, in other embodiments, one end of the X-ray shielding 2 adjacent to the baffle 31 is set as a groove 22, the baffle 31 is movably set in the groove 22, and the baffle 31 and the X-ray shielding 2 are set at a preset distance.

[0049] Specifically, the preset distance is set to a smaller gap, such as a gap of 1 mm or 2 mm wide. In order to prevent the secondary X-rays from being transmitted from the gap and directly irradiating the pipeline assembly 1, the present embodiment sets one end of the X-ray shielding 2 adjacent to the baffle as a groove 22, and then sets the baffle 31 in the groove 22, so that the secondary X-rays transmitted from the gap irradiate the inner wall of the groove 22 and are absorbed by the X-ray shielding 2, and will not irradiate the pipeline assembly 1 and cause radiation leakage.

[0050] Furthermore, in order to ensure that all the secondary X-rays transmitted from the gap are absorbed by the X-ray shielding member 2 , the depth of the groove 22 is greater than a preset distance.

[0051] Specifically, with the X-ray propagation direction as a reference, the maximum propagation angle of the secondary X-ray is infinitely close to 90° or -90°, that is, close to the degree of parallelism with the baffle. Therefore, it is only necessary to set the depth of the groove 22 to be greater than the preset distance so that the secondary X-ray propagating at the maximum angle will not irradiate outside the groove 22, thereby avoiding the secondary X-ray irradiation of the pipeline assembly 1.

[0052] Figure 5 Schematic diagram of the structure of an X-ray detection device according to an embodiment of the present invention. Figure 5 As shown, the X-ray detection equipment includes: an X-ray light source 100, an X-ray light source shielding room 200 and a switch device 300 for the X-ray detection equipment of one of the above embodiments, the X-ray light source 100 is arranged in the X-ray light source shielding room 200, a window is arranged on the X-ray light source shielding room 200, and the light inlet 1a of the switch device is connected to the window.

[0053] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit may be implemented in the form of hardware or in the form of software functional units. The above is only an implementation method of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of this application, or directly or indirectly used in other related technical fields, is also included in the patent protection scope of the present application.

Claims

1. A switch device for an X-ray detection device, characterized in that: It includes: A pipeline assembly, the pipeline assembly comprising a light inlet and a light outlet arranged at two ends; An X-ray shielding member, wherein the X-ray shielding member is sleeved in the pipeline assembly, and a through hole penetrating the X-ray shielding member is provided at the center of the X-ray shielding member; A baffle assembly, the baffle assembly being movably disposed at one end of the through hole close to the light outlet to open or cover the through hole; When the baffle assembly blocks the through hole, the X-rays passing through the through hole and irradiating the baffle generate secondary X-rays that irradiate the inner wall of the through hole and / or pass through the light inlet to irradiate the X-ray source shielding room.

2. The switch device for X-ray detection equipment according to claim 1, characterized in that: The pipeline assembly includes a vacuum tube, and a first connector and a second connector respectively arranged at both ends of the vacuum tube, the first connector is used to connect to the window of the X-ray source shielding room, and the second connector is used to connect to the window of the detector shielding room.

3. The switch device for X-ray detection equipment according to claim 1, characterized in that: The X-ray shielding component comprises a shielding cylinder made of a metal material with strong X-ray absorption capability, and the outer side surface of the shielding cylinder is in close contact with the inner side wall of the pipeline assembly.

4. The switch device for X-ray detection equipment according to claim 1, characterized in that: The maximum distance from the center of the through hole to the inner wall of the through hole, the length of the through hole, the diameter of the pipe assembly, and the distance from one end of the through hole close to the light inlet to the light inlet are all preset, so that among the secondary X-rays generated by the X-rays irradiated on the baffle, with the X-ray propagation direction as a reference, the secondary X-rays that meet the first propagation angle are irradiated to the inner wall of the through hole, and the secondary X-rays that meet the second propagation angle pass through the light inlet and propagate to the X-ray source shielding room.

5. The switch device for X-ray detection equipment according to claim 4, characterized in that: The first propagation angle and the second propagation angle are determined based on the maximum distance from the center of the through hole to the inner wall of the through hole and the length of the through hole. The first propagation angle is expressed as: and The second propagation angle is expressed as: Wherein, A represents the maximum distance from the center of the through hole to the inner wall of the through hole, and B represents the length of the through hole.

6. The switch device for X-ray detection equipment according to claim 5, characterized in that: The maximum distance from the center of the through hole to the inner wall of the through hole, the length of the through hole, the diameter of the pipe assembly, and the distance from one end of the through hole close to the light inlet to the light inlet satisfy the following relationship: Wherein, C represents the distance from one end of the through hole close to the light inlet to the light inlet, and D represents the diameter of the pipe assembly.

7. The switch device for X-ray detection equipment according to claim 1, 4, 5 or 6, characterized in that: The through hole is a circular through hole, and the maximum distance from the center of the through hole to the inner wall of the through hole is the radius of the circular through hole.

8. The switch device for X-ray detection equipment according to claim 1, characterized in that: The baffle assembly includes a baffle and a baffle driving system. The baffle is movably arranged at one end of the through hole close to the light outlet. The output end of the baffle driving system is connected to the baffle. The diameter of the baffle is larger than the diameter of the through hole. The baffle driving system drives the baffle according to an external input instruction to open or cover the through hole.

9. The switch device for X-ray detection equipment according to claim 8, characterized in that: One end of the X-ray shielding member adjacent to the baffle is arranged as a groove, the baffle is movably arranged in the groove, and the baffle and the X-ray shielding member are arranged at a preset distance.

10. The switch device for X-ray detection equipment according to claim 9, characterized in that: The depth of the groove is greater than the preset distance.

11. An X-ray detection device, characterized in that: It includes an X-ray light source, an X-ray light source shielding room and a switch device for X-ray detection equipment as described in any one of claims 1 to 10, wherein the X-ray light source is arranged in the X-ray light source shielding room, a window is arranged on the X-ray light source shielding room, and the light inlet of the switch device is connected to the window.

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