A multi-optical path collective beam limiter and beam limiting method

Abstract

The present application discloses a multi-optical path collective beam limiter, including a radiation-proof outer shell, the outer shell is penetrated from top to bottom with a passage for X-ray irradiation emitted by the focus of the tube arranged above the beam limiter, and the outer shell is also respectively installed with an illumination unit for spatially overlapping the light field and the ray field and a laser positioning unit for coinciding the center of the positioning laser with the center of the ray field; and a beam limiting mechanism for adjusting the effective irradiation range of the ray field, and an adjustment mechanism for driving the beam limiting mechanism to adjust the ray field. The present application adopts a brand-new structural design, which can realize the integration of visible light, positioning laser and X-rays, overlap the effective ray field generated by invisible X-rays with the light field, make the X-ray field visualized, and use laser positioning to indicate the center, so that the part to be irradiated can be aligned with the best irradiation area at one time, and the best irradiation film can be obtained at one time.

Description

Technical Field

[0001] The present invention relates to the field of X-ray precision irradiation devices, in particular to the field of beam limiters for X-rays, and specifically to a multi-light path aggregate beam limiter and a method for realizing light path and ray constraints using the beam limiter. Background Art

[0002] The beam limiter is an electromechanical optical device installed in front of the output window of the X-ray tube assembly. Its main function is to control the irradiation field of the X-ray tube output line, so as to minimize the projection range and avoid unnecessary doses while meeting the requirements of X-ray imaging and diagnosis; it can also absorb some scattered rays to improve image clarity. In addition, it can also indicate the size of the projection center and projection field of view. Therefore, the beam limiter is an indispensable auxiliary device for X-ray projection and protection.

[0003] According to the opening and closing methods of the beam limiter lead blades, they can generally be divided into manual beam limiters, electric beam limiters and fully automatic beam limiters. The ultimate goal is the same, which is to achieve artificial control and intervention of the radiation field to achieve the desired irradiation range. In terms of structural complexity, the fully automatic beam limiter is the most complex. Compared with the electric beam limiter, it has more position sensing units and feedback units. Due to the actual use of the beam limiter, it is relatively convenient and accurate to adjust it manually, which has convenient, flexible, practical and accurate technical effects. The existing manual beam limiter designs have various structures, or use a simple deflection plate to change the position of the lead blade, but with poor stability and low precision; or use a belt to connect the slider to drive the lead blade to change its position to achieve the technical effect of beam limiting.

[0004] A similar prior art case was retrieved: Chinese utility model patent, application number CN201920263124.7 discloses a manual beam limiter for X-ray diagnostic equipment, including a bottom plate assembly, an inner door transmission assembly, a support frame assembly, a transmission assembly, a main board assembly, a lamp holder assembly, a laser lamp assembly and a shell assembly, wherein a support frame assembly is installed on the bottom plate assembly, a main board assembly is arranged above the support frame assembly, and the inner door transmission assembly is transmission-connected between the transmission assembly and the tower-shaped inner door assembly in the bottom plate assembly; a manual knob is arranged at the input end of the transmission assembly, and the output end is transmission-connected with the main board assembly and the inner door transmission assembly; the lamp holder assembly is installed at the rear end of the main board assembly, and the laser lamp assembly is installed at the front end of the main board assembly; and the above components are integrally installed in a shell. The transmission assembly of the patent document combines gears and synchronous belts, which is easy to assemble, runs smoothly, and reduces assembly time; a filtering function is added, and a plurality of filters with selectable irradiation intensity are provided to reduce the irradiation intensity to the human body.

[0005] In the prior art, the most commonly used positioning method is to set a "cross" shading material that can block visible light in the cross section of the X-ray irradiation path, so that a "cross" light shadow will be formed in the irradiated light field. The light shadow is used to indicate the center of the ray field. However, based on the principle of rectilinear propagation of light, the shadow will continue to increase with the increase of distance, resulting in inaccurate positioning, which can easily lead to the failure of a single film shoot and the need for multiple shots, resulting in cost waste, increased damage, and reduced efficiency. Summary of the invention

[0006] In order to solve the technical problem of accurate irradiation of X-ray devices during use, the present application provides a multi-optical path collective beam limiter, which is used to achieve accurate beam limiting of X-rays, and to achieve arbitrary adjustment of the length direction and / or width direction of the horizontal section of the ray field within the effective adjustment range, while integrating positioning laser, visible light and X-rays to achieve accurate constraint and adjustment of X-rays. At the same time, the present invention also provides a method for realizing optical path and ray constraint using the beam limiter.

[0007] In order to achieve the above purpose, the technical solution adopted in this application is:

[0008] A multi-optical path collective beam limiter includes a radiation-proof outer shell, the outer shell is penetrated from top to bottom with a passage for irradiation of X-rays emitted from the focus of a tube arranged above the beam limiter, and the outer shell is also respectively installed with an illumination unit for spatially overlapping the light field and the ray field and a laser positioning unit for coinciding the positioning laser center with the center of the ray field; and a beam limiting mechanism for adjusting the effective irradiation range of the ray field, and an adjustment mechanism for driving the beam limiting mechanism to adjust the ray field. In actual use, the tube or X-ray machine is installed on the outer shell, so that the irradiation direction of the X-rays emitted from the focus of the tube runs through the entire beam limiter, and the illumination unit forms a containing or contained relationship with the X-ray range emitted from the focus of the tube after at least one or more refractions and / or reflections of the visible light, and the preferred state is a coincidence state. The laser positioning unit makes the emitted laser beam coincide with the central emission limiting beam after at least one or more refractions and / or reflections, which is used to indicate the center of the effective ray field, which is convenient for visual operation, and accurately aligns the target object to be irradiated with the center point to obtain the best irradiation effect.

[0009] As one of the preferred embodiments of the present application, the lighting unit is specifically configured as follows to provide a structure involved in the propagation of the entire visible light beam from the light source to the irradiated target: it includes an LED light source installed on the inner wall of the outer shell for emitting a lighting beam, and a mirror glass and a reflector installed in sequence along the propagation direction of the lighting beam, which are used to reflect the lighting beam so that the light field formed by the lighting beam coincides with the ray field. It is worth noting that, since the present application has a beam limiting mechanism, when the light field and the ray field do not completely overlap and are in a state of containing or being contained, if the beam and the X-ray beam are limited by the beam limiting mechanism, the effective beam limiting edge of the beam limiting mechanism is in contact with the light field and the ray field at the same time, and the technical effect of the light field and the ray field completely overlapping can also be obtained; therefore, when the light field and the ray field overlap, it is the best state, not a necessary state. As long as the visible light beam range emitted by the LED light source is larger than the illumination range required for illumination, and the X-ray range emitted by the focus of the tube is larger than the required irradiation range, the visible light beam and the X-ray beam limiting set can be completely overlapped through the beam limiting mechanism to achieve the best state, that is, the light field range formed by the visible light is all irradiated by the X-ray effect, so as long as the target is placed in the visible light range, perfect irradiation can be achieved, and simple, visual operation can be achieved. With the laser beam, the required irradiation range or part can be clearly aligned with the center of the ray field, achieving one-time irradiation and one-time success, avoiding the trouble and repetitive operation of inaccurate and unclear imaging, multiple irradiations, and the need for repetitive operations.

[0010] As a preferred technical solution of the present application, the laser positioning unit includes a laser directly or indirectly fixedly mounted on the inner wall of the outer shell, and the emission point of the laser and the focus of the tube are mirror-symmetrical relative to the reflecting surface of the reflector; the acute angle e formed by the central laser beam emitted by the laser and the reflecting surface of the reflector is equal to the acute angle f formed by the central X-ray emitted by the focus of the tube and the reflecting surface of the reflector.

[0011] The LED light source and the emission point of the laser are installed in mirror symmetry with respect to the reflective surface of the mirror glass, and the acute angle h between the central light beam of the LED light source and the reflective surface of the mirror glass is equal to the acute angle g formed by the central laser beam emitted by the laser and the reflective surface of the mirror glass. The above structure is set up to utilize the linear propagation and total reflection principle of light, and can integrate the visible light beam, laser beam and X-rays invisible to the naked eye into one, and intuitively reflect the invisible X-rays through visible light recognizable by the naked eye. At the same time, by accurately controlling the installation position of the LED light source that emits visible light and the angle of the visible light emitted, the position of the laser emission point and the laser emission angle, the installation position and emission angle of the tube focus, and the installation position and installation angle of the mirror glass and the reflector, the integration and unification of multiple light paths are achieved, and the technical effect of optimal overlap is achieved. For another situation as described above, when the coverage angle of the visible light beam includes the coverage angle of the X-ray, there is visible light illumination within the effective X-ray range, and the same effect can be achieved through uniform constraint by the beam limiting mechanism; conversely, when the coverage angle of the X-ray is greater than the coverage angle of the visible light, the light field irradiated within the effective window can be equal to the ray field through uniform constraint by the beam limiting mechanism, and precise irradiation can be implemented. It is worth noting that when selecting a tube or X-ray machine model, it is necessary to note that the coverage angle of the X-ray emitted by the focus of the tube should not be less than the angle when the beam limiting mechanism is in the maximum state, and there should be no irradiation blind area. It is necessary to ensure that the X-ray fully covers the spatial cross-section formed when the beam limiting mechanism is in the maximum state. If this condition is not met, it is necessary to replace the focus of the tube with a larger coverage range. Since the tube or X-ray machine is an existing commercially available product, it is only necessary to select one that meets the conditions of this application. Similarly, the visible light coverage range emitted by the selected LED light source should also achieve full coverage of the beam limiting mechanism when it is in the maximum state, leaving no blind spots; of course, generally commercially available wide-angle LED light sources can meet the conditions of this application, except for single-beam LED spotlights. Therefore, the range of existing commercially available light sources or ray sources selected in this application is very wide and highly compatible.

[0012] Preferably, the dispersed irradiation angle of the visible light emitted by the LED light source can be selected or adjusted so that after the illumination light beam emitted by the LED light source is reflected by the mirror glass and the reflector in sequence, the edgemost light beam a coincides with the edgemost limiting beam c. The laser is a discrete, continuous or cross-beam laser including a central laser, and the laser beam b at the edge coincides with the edgemost limiting beam c after being reflected by the reflector; after the illumination light beam emitted by the LED light source is reflected by the mirror glass and the reflector in sequence, the edgemost light beam a coincides with the edgemost limiting beam c.

[0013] As a preferred implementation scheme of the present application, the following structure is particularly adopted: the adjustment mechanism includes a first adjustment mechanism and a second adjustment mechanism that are independently manually controlled, and the beam limiting mechanism includes a first beam limiting unit and a second beam limiting unit. The first adjustment mechanism drives and connects the first beam limiting unit, so that the two first beam limiting modules symmetrically installed on any opposite sides of the passage to form the first beam limiting unit perform relative opening and closing movements. The second adjustment mechanism drives and connects the second beam limiting unit, so that the two second beam limiting modules symmetrically installed on the opposite sides of the passage perpendicular to the first beam limiting unit to form the second beam limiting unit perform relative opening and closing movements.

[0014] It is further preferably arranged that the first adjustment mechanism includes a first adjustment unit which is driven and connected in sequence, a first gear which is fixedly axially mounted on the first adjustment unit, and a first gear, a second gear, and a third gear which are driven and connected in sequence; the second gear and the third gear are fixedly connected on one side close to the first beam limiting module with a first driving plate which is used to adjust the swing angle of the corresponding first beam limiting module to realize the relative opening and closing movement of the first beam limiting modules installed in pairs.

[0015] It is further preferably arranged that the second adjustment mechanism includes a second adjustment unit which is driven and connected in sequence, a fourth gear which is fixedly axially mounted on the second adjustment unit, and a fourth gear, a fifth gear, and a sixth gear which are driven and connected in sequence; the fifth gear and the sixth gear are fixedly connected on one side close to the second beam limiting module with a second driving plate which is used to adjust the swing angle of the corresponding second beam limiting module to realize the relative opening and closing movement of the second beam limiting modules installed in pairs.

[0016] As a detailed structural setting of the present application, a rack meshing with the fourth gear is fixedly arranged on the fifth gear. The fourth gear is preferably a bevel gear, and the rack is an arc-shaped rack meshing with the bevel gear.

[0017] In order to facilitate manual adjustment and improve the stability of the limiting mechanism, the first adjustment unit includes a turntable installed at the end of the main shaft connected to the first gear for easy gripping and rotation, a first nut and a second nut threadedly connected to the main shaft, and an arc-shaped gasket installed between the first nut and the outer shell for adjusting the rotation resistance of the turntable. The first nut and the second nut are installed adjacent to each other, and the mutual force formed by mutual abutment and extrusion can maintain the relative fixity of the first nut, the second nut and the main shaft. During actual adjustment, the arc-shaped gasket is applied with different pressures by rotating the turntable to generate anti-rotation resistance, so as to ensure the stability of the first adjustment unit in any adjustment position.

[0018] For the convenience of setting, the specific structure of the second adjusting unit is the same as that of the first adjusting unit.

[0019] In order to further realize the driving connection relationship between the adjustment mechanism and the beam limiting mechanism, preferably, both end faces of any first beam limiting module are fixedly connected with an axle pin, and the first driving plate is provided with a strip groove for accommodating the axle pin at one end away from the second gear and the third gear. The first beam limiting module is directly or indirectly fixedly hinged to the outer shell on the side away from the axle pin, so that the first beam limiting module can be positionally adjusted along the fixed hinge point under the drive of the first driving plates on both sides.

[0020] Furthermore, the first beam-limiting module includes at least one layer of first beam-limiting lead plates arranged horizontally. The thickness of the specific lead plates or the number of the first beam-limiting lead plates arranged can be flexibly determined according to the effective protective effect of the radiation-proof lead sheet arranged on the outer shell; in order to ensure the safety of the application, preferably, the first beam-limiting lead plates can be arranged in multiple layers, such as two or three layers, and the total thickness of the first beam-limiting lead plates arranged can block a radiation dose that is more than times the actual X-ray radiation dose, so as to ensure the absolute safety of the application during use and prevent radiation contamination and damage.

[0021] Both end surfaces of any second beam-limiting module are fixedly connected with axle pins, and a strip groove for accommodating the axle pin is provided at one end of the second drive plate away from the fifth gear and the sixth gear, and the second beam-limiting module is directly or indirectly fixedly hinged to the outer shell at one side away from the axle pin, so that the second beam-limiting module can be adjusted along the fixed hinge point under the driving of the second drive plates on both sides. The second beam-limiting module includes a second beam-limiting lead plate and a third beam-limiting lead plate arranged horizontally and overlapping each other.

[0022] In order to further improve the compatibility of the structure of the present application, preferably, a connector for installing a tube is further provided on the upper end surface of the outer shell, and the connector is further provided with a locking rod for locking the connector and the tube. The locking rod is connected to the connector by a thread and the position of the locking rod is adjusted to achieve the abutment or clamping locking of the connector and the tube. Since another purpose of the invention of the present application is to provide a method that can improve the beam limiting effect as much as possible while being compatible with standard tubes or X-ray machines on the market, the upper part of the connector adopts a standard structure that can be quickly installed with existing tubes or X-ray machines. The connector can be configured with more than one set of detachable connectors for tubes or X-ray machines of different models that meet the radiation requirements of the present application, so as to further meet the needs of customers to match the existing mainstream tubes or X-ray machines with the beam limiter described in the present application, thereby reducing the cost investment of the entire X-ray irradiation system. Regardless of the type of connector, the lower part adopts a standard interface to be detachably fixed to the outer shell.

[0023] In order to further improve the safety of the present application, a lead layer for preventing radiation contamination is provided on any surface of the outer shell; a sealed irradiation plate for preventing foreign matter from entering the beam limiter is fixedly installed on the lower surface of the outer shell.

[0024] The present invention also provides a beam limiting method, which is implemented by using the above-mentioned multi-light path aggregate beam limiter.

[0025] The specific steps include:

[0026] Step S100 sets three independent emission points, which are respectively the focus of the tube emitting X-rays, the LED light source emitting visible light, and the laser emitting cross lasers;

[0027] Step S200 debugs the three emission points in step S100 and satisfies the following conditions:

[0028] Step S210: Install the tube just above the beam limiter and ensure that the center ray of the X-ray emitted from the focus of the tube is directed vertically downward and coincides with the theoretical center line of the passage;

[0029] Step S220: Install the laser and the reflector and meet the following conditions:

[0030] Step S2201: the emission point of the laser and the focus of the tube are mirror-symmetrical with respect to the reflection surface of the reflector;

[0031] Step S2202: the acute angle e formed by the central laser beam emitted by the laser and the reflective surface of the reflector is equal to the acute angle f formed by the central X-ray emitted by the focus of the tube and the reflective surface of the reflector;

[0032] Step S230: Install the LED light source and the mirror display glass and meet the following conditions:

[0033] Step S2301: the emission points of the LED light source and the laser are mirror-symmetrical with respect to the reflection surface of the mirror glass;

[0034] Step S2302: the acute angle h between the central light beam of the LED light source and the reflective surface of the mirror glass is equal to the acute angle g formed by the central laser beam emitted by the laser and the reflective surface of the mirror glass;

[0035] Step S300: Turn on the tube, and make the intersection of the cross laser emitted by the laser be located at the center of the ray field in the target irradiation field, so that the ray field and the light field coincide.

[0036] Beneficial Effects

[0037] 1. The present application adopts a brand-new structural design, which can realize the integration of visible light, positioning laser and X-rays, overlap the effective ray field generated by invisible X-rays with the light field, visualize the X-ray field, and use laser positioning to indicate the center, so that the part to be irradiated can be aligned with the best irradiation area at one time, and the best irradiation film can be obtained at one time.

[0038] 2. The present application can flexibly realize the lateral and / or longitudinal adjustment of the horizontal cross-section of the radiation field through the ingenious design of the adjustment mechanism and the beam limiting mechanism, so as to flexibly adjust the effective radiation field and make adaptive adjustments for different sizes of irradiated parts. By adding a simple and practical damping mechanism, the operation is convenient, the stability is high, and the practicality is strong.

[0039] 3. The structural design of the present application is compact, and the optical path, laser and ray are integrated without obstruction, which solves the problem that the center point becomes larger or smaller as the distance of the irradiated ray changes, which is not conducive to accurate positioning, caused by the existing technology of achieving midpoint positioning by blocking the visible light path. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative labor.

[0041] Figure 1 This is a schematic diagram of the illumination status of the application.

[0042] Figure 2 This is the front view of the beam limiter.

[0043] Figure 3 yes Figure 2 Section view along the cutting symbol AA.

[0044] Figure 4 yes Figure 3 Enlarged view of the structure of area E in the middle.

[0045] Figure 5 It is the left side view of the beam limiter.

[0046] Figure 6 yes Figure 5 Section view along the cutting symbol BB.

[0047] Figure 7 It is a top view of the beam limiter without the upper end surface outer shell.

[0048] Figure 8 yes Figure 7 Enlarged view of the structure of the middle C area.

[0049] Fig. 9 yes Figure 7 Enlarged view of the structure of the middle D area.

[0050] Fig.10 3D structural diagram of the internal adjustment mechanism and the beam limiting mechanism of the beam limiter.

[0051] Fig.11 for Fig.10 Another perspective three-dimensional structure diagram.

[0052] Fig.12 for Fig.10 Another perspective three-dimensional structure diagram.

[0053] Fig.13 A is a schematic diagram of the prior art using shadow blocking to locate the close-range irradiation light field.

[0054] Fig.13 B is adopted Fig.13 Schematic diagram of the mid-range irradiation light field of technique A.

[0055] Fig.13 C is adopted Fig.13 Schematic diagram of the integrated light field formed by long-distance irradiation of the target object using technology A.

[0056] Fig.14 A and 14B are schematic diagrams of the integrated light field for illuminating the same distance and target object as that of the present application and the prior art shadow positioning.

[0057] Fig.15 A-15C is a schematic diagram of the integrated light field for illuminating target objects at long, medium and short distances in this application.

[0058] In the figure: 1-outer shell; 2-tube focus; 3-connector; 31-locking rod; 4-reflector; 5-LED light source; 6-mirror display glass; 7-laser; 8-adjustment mechanism; 9-beam limiting mechanism; 10-axle pin; 11-strip groove; 12-sealed irradiation plate.

[0059] 81-first adjustment mechanism; 811-first adjustment unit; 812-first gear; 813-second gear; 814-third gear; 815-first driving plate; 8110-arc gasket; 8111-first nut; 8112-second nut; 8113-turntable; a-light beam; b-laser beam; c-limiting beam.

[0060] 82 - second adjustment mechanism; 821 - second adjustment unit; 822 - fourth gear; 823 - fifth gear; 824 - sixth gear; 825 - rack; 826 - second drive plate.

[0061] 91 - first beam limiting unit; 911 - first beam limiting lead plate; 92 - second beam limiting unit; 921 - second beam limiting lead plate; 922 - third beam limiting lead plate.

[0062] e represents the acute angle formed by the central laser emitted by the laser and the reflecting surface of the reflector;

[0063] f represents the acute angle between the central X-ray emitted by the focus of the tube and the reflecting surface of the reflector

[0064] h represents the acute angle between the central light beam of the LED light source and the reflecting surface of the mirror glass;

[0065] g represents the acute angle formed by the central laser beam emitted by the laser and the reflecting surface of the mirror glass. DETAILED DESCRIPTION

[0066] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0067] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0068] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0069] In the description of this application, it should be noted that if the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the product of the application is usually placed when in use. It is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on this application. In addition, if the terms "first", "second", etc. appear in the description of this application, they are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0070] In addition, if the terms "horizontal" or "vertical" appear in the description of this application, it does not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0071] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0072] Embodiment 1:

[0073] In order to better achieve the beneficial technical effects that can be brought about by this application, this embodiment briefly describes the setting and implementation of the overall structure of the beam limiter, specifically in conjunction with the appendix to the specification of this application. Figure 1-3 A multi-optical path collective beam limiter is shown, comprising a radiation-proof outer shell 1, wherein the outer shell 1 is provided with a passage from top to bottom for convenient X-ray irradiation emitted by the focus 2 of the tube arranged above the beam limiter, and the passage is improved by structural design, thereby eliminating the existence of some physical structures in the passage as in some prior arts, so as to block X-rays and / or visible light and / or lasers. The outer shell 1 is also provided with an illumination unit for spatially overlapping the light field and the ray field, and a laser positioning unit for aligning the positioning laser center with the ray field center;

[0074] The lighting unit is a general term for structures that provide visible light and fuse visible light with invisible rays; the laser positioning unit is a general term for structures involved in the emission and propagation of laser beams that provide laser beams and point the laser beams to the center of the ray field through refraction or reflection; and a beam limiting mechanism 9 for adjusting the effective irradiation range of the ray field, and an adjustment mechanism 8 for driving the beam limiting mechanism to adjust the ray field. In actual use, the tube or X-ray machine is installed on the outer shell 1, so that the irradiation direction of the X-rays emitted from the focus 2 of the tube runs through the entire beam limiter, and the lighting unit forms a containing or contained relationship with the X-ray range emitted from the focus 2 of the tube after at least one or more refractions and / or reflections of the visible light, and the preferred state is a coincidence state. The laser positioning unit overlaps the emitted laser beam with the central irradiation limiting beam after at least one or more refractions and / or reflections, which is used to indicate the center of the effective ray field, facilitate visual operation, and accurately align the target object to be irradiated with the center point to obtain the best irradiation effect. It avoids the problem of poor photo quality caused by inaccurate positioning and too large positioning center, and the need for repeated irradiation. In this embodiment, the visible light path, the X-ray limiting beam and the positioning laser beam are integrated and the light propagation principle of refraction and reflection is fully utilized to solve the light blocking problem existing in the prior art; at the same time, the beam limiting mechanism is used to uniformly limit and eliminate redundant, scattered visible light and X-rays so that the light field formed by the visible light of the beam limiter provided by this embodiment overlaps and superimposes with the invisible X-ray field, thereby realizing precise visualization operation and achieving the technical effect of taking a picture once and completing it at one time. Compared with the prior art, the effect is improved and the loss cost and time cost are reduced; at the same time, the radiation damage to the irradiated part caused by multiple irradiations is also reduced.

[0075] Embodiment 2:

[0076] In order to more clearly and thoroughly explain the technical effects that can be used in this application to achieve multi-light path collection and precise illumination, this embodiment provides one of the preferred implementation schemes, specifically providing a multi-light path collection beam limiter, combined with the attached manual Figure 1-6The content shown includes a radiation-proof outer shell 1, which is provided with a passage for X-ray irradiation emitted by the focus 2 of the tube arranged above the beam limiter from top to bottom, and the outer shell 1 is also provided with an illumination unit for spatially overlapping the light field and the ray field and a laser positioning unit for coinciding the positioning laser center with the ray field center; and a beam limiting mechanism 9 for adjusting the effective irradiation range of the ray field, and an adjustment mechanism 8 for driving the beam limiting mechanism to adjust the ray field. The illumination unit is specifically provided as follows for providing the structure involved in the entire visible beam propagation from the light source to the irradiation target: including an LED light source 5 for emitting an illumination beam installed on the inner wall of the outer shell 1, and a mirror glass 6 and a reflector 4 for reflecting the illumination beam so that the light field formed by the illumination beam coincides with the ray field, which are sequentially installed along the propagation direction of the illumination beam. It is worth noting that, since the present application has a beam limiting mechanism, when the light field and the ray field do not completely overlap and are in a state of containing or being contained, if the beam limiting mechanism is used to limit the light beam and the X-ray beam, the effective beam limiting edge of the beam limiting mechanism is in contact with the light field and the ray field at the same time, and the technical effect of the light field and the ray field completely overlapping can also be obtained; therefore, when the light field and the ray field overlap, it is the best state, not a necessary state, as long as the visible light beam range emitted by the LED light source 5 is larger than the illumination range required for illumination, and the X-ray range emitted by the focus of the tube 2 is larger than the required irradiation range, the visible light beam and the X-ray beam limiting set can be completely overlapped through the beam limiting mechanism to achieve the best state, that is, the light field range formed by the visible light is all irradiated by the X-ray effect, so as long as the target object is placed in the visible light range, perfect irradiation can be achieved, and simple, visual operation can be achieved. With the laser beam, the required irradiation range or part can be clearly aligned with the center of the ray field, achieving one-time irradiation and one-time success, avoiding the trouble and repetitive operation of inaccurate and unclear imaging, multiple irradiations, and the need for repetitive operations.

[0077] In this embodiment, the laser positioning unit includes a laser 7 directly or indirectly fixedly mounted on the inner wall of the outer shell 1, and the emission point of the laser 7 is mirror-symmetrical with the focus 2 of the tube relative to the reflective surface of the reflector 4; the acute angle e formed by the central laser beam emitted by the laser 7 and the reflective surface of the reflector 4 is equal to the acute angle f formed by the central X-ray emitted by the focus 2 of the tube and the reflective surface of the reflector 4. The LED light source 5 and the emission point of the laser 7 are mirror-symmetrically mounted relative to the reflective surface of the mirror glass 6, and the acute angle h formed by the central light beam of the LED light source 5 and the reflective surface of the mirror glass 6 is equal to the acute angle g formed by the central laser beam emitted by the laser 7 and the reflective surface of the mirror glass 6. The above-mentioned structural setting utilizes the principle of rectilinear propagation and total reflection of light, and can integrate visible light beams, laser beams and X-rays invisible to the naked eye into one, and intuitively reflect invisible X-rays through visible light recognizable by the naked eye. At the same time, by accurately controlling the installation position of the LED light source 5 that emits visible light and the angle of the emitted visible light, the position of the emission point of the laser 7 and the laser emission angle, the installation position and emission angle of the tube focus 2, and the installation position and installation angle of the mirror display glass 6 and the reflector 4, the collection and unification of multiple light paths is realized, and the technical effect of optimal overlap is achieved.

[0078] It is worth noting that the mirror glass 6 described in the present application is an existing optical lens, not invented by the applicant, and is also commonly known as a "magic mirror". The technical effects and functions it possesses are: first, reflecting the visible light emitted by the LED light source 5 to achieve a change in the optical path propagation path of the visible light; second, when the laser beam emitted by the laser 7 passes through the mirror glass 6, the laser is propagated along a straight line or a parallel line. Since the existing mirror glass products all have debugged functions, including the amount of reflection, the angle of refraction, etc., only the appropriate specifications need to be selected. In this embodiment, the three situations such as the above-mentioned light field, ray field and laser beam being included or being included or overlapping can be realized, so the optional room for the mirror glass 6 is very large, and the cost investment of the present application can be further reduced, which greatly improves the compatibility of the present application with the existing technology.

[0079] For another situation as described above, when the coverage angle of the visible light beam includes the coverage angle of the X-ray, there is visible light illumination within the effective X-ray range, and the same effect can be achieved through the uniform constraint of the beam limiting mechanism; conversely, when the coverage angle of the X-ray is greater than the coverage angle of the visible light, the light field irradiated within the effective window can be equal to the ray field through the uniform constraint of the beam limiting mechanism, and precise irradiation can be implemented. It is worth noting that when selecting a tube or X-ray machine model, it is necessary to note that the coverage angle of the X-ray emitted by the tube focus 2 should not be less than the angle when the beam limiting mechanism is in the maximum state, and there should be no irradiation blind area. It is necessary to ensure that the X-ray fully covers the spatial cross-section formed when the beam limiting mechanism is in the maximum state. If this condition is not met, it is necessary to replace the tube focus 2 with a larger coverage range. Since the tube or X-ray machine is an existing commercially available product, it is only necessary to select one that meets the conditions of this application. Similarly, the visible light coverage range emitted by the selected LED light source 5 should also achieve full coverage of the beam limiting mechanism when it is in the maximum state, leaving no blind spots; of course, generally commercially available wide-angle LED light sources 5 can meet the conditions of this application, except for single-beam LED spotlights, so the range of existing commercially available light sources or ray sources selected in this application is very wide and highly compatible.

[0080] In this embodiment, the dispersed irradiation angle of the visible light emitted by the LED light source 5 can be selected or adjusted so that after the illumination light beam emitted by the LED light source 5 is reflected by the mirror glass 6 and the reflector 4 in sequence, the edgemost light beam a coincides with the edgemost limiting beam c. The laser 7 is a discrete, continuous or cross-beam laser including a central laser, and the laser beam b at the edge coincides with the edgemost limiting beam c after being reflected by the reflector 4; after the illumination light beam emitted by the LED light source 5 is reflected by the mirror glass 6 and the reflector 4 in sequence, the edgemost light beam a coincides with the edgemost limiting beam c.

[0081] Further combined with Fig.13 A-13C, Fig.14 A. Fig.14 B. Fig.15 As shown in A-15C, at least two continuous laser lines emitted by a cross-beam laser are used for indication. In this embodiment, a commercially available laser 7 emitting a cross laser is used. Alternatively, an "X" or "M" shaped cross laser beam can be used to obtain an equivalent positioning effect. Fig.13 As shown in A-13C, its disadvantages are mainly in two aspects:

[0082] First, the greater the irradiation distance, the wider the positioning shadow will be, and the larger the area of ​​the positioning intersection will be, making it impossible to accurately irradiate small areas.

[0083] Secondly, since occlusion positioning relies on shadows in the light field, in actual use, when the target object is dark or bright in color or reflects light, it is difficult for the naked eye to capture the shadow intersections and shadow lines, which poses a great challenge to accurate positioning of the illumination. Therefore, the above reason is also the reason why the existing technology requires multiple irradiations to obtain an ideal film.

[0084] The irradiation effect of this application is as follows Fig.14 A. Fig.14 B. Fig.15 As shown in A-15C, the problem of the positioning laser becoming wider, and the accuracy and recognition being reduced due to the distance mentioned in the first aspect will not occur. Since the laser beam is emitted from the laser 7 and has a separate light source, the light path only passes through the mirror glass 6 and is reflected by the reflector 4. The visible width during the entire beam propagation process is basically unaffected. Under normal circumstances, the laser beam propagates within a range of 100 meters without visible attenuation and dispersion to the naked eye. Therefore, its positioning effect is improved by more than one order of magnitude compared to the prior art. At the same time, due to the bright color value and high light sensitivity of the laser beam, no matter what color the target is irradiated, it can be clearly distinguished by the naked eye, which can meet the purpose of one-time precise positioning and one-time irradiation.

[0085] It is worth noting that: according to the applicant's investigation abroad, a certain American company has developed a beam limiter product for external laser-assisted positioning. The main idea is to combine the laser light source and the beam limiter product structure, and finally realize the laser line indicating the center of the ray field or light field after precise parameter debugging; but the prerequisite for the product to achieve precise positioning is that the irradiation distance cannot be changed at will, otherwise the positioning will be inaccurate. At the same time, the laser line is a fixed length, and the light field cannot be enlarged due to the adjustment of the leaf with the adjustment mechanism, and the technical effect of the cross laser always covering the entire light field in this application cannot be achieved.

[0086] Embodiment 3:

[0087] This embodiment provides a preferred arrangement scheme for the adjustment mechanism 8 and the limiting mechanism 9. Figure 1-12 The content shown. The adjustment mechanism 8 includes a first adjustment mechanism 81 and a second adjustment mechanism 82 that are independently manually controlled, and the beam limiting mechanism 9 includes a first beam limiting unit 91 and a second beam limiting unit 92. The first adjustment mechanism 81 drives and connects the first beam limiting unit 91, so that the two first beam limiting modules symmetrically installed on any opposite sides of the passage to form the first beam limiting unit 91 perform relative opening and closing movements. The second adjustment mechanism 82 drives and connects the second beam limiting unit 92, so that the two second beam limiting modules symmetrically installed on the opposite sides of the passage perpendicular to the first beam limiting unit 91 to form the second beam limiting unit 92 perform relative opening and closing movements.

[0088] In this embodiment, for the first adjustment mechanism 81, the first adjustment mechanism 81 includes a first adjustment unit 811 that is sequentially driven and connected, a first gear 812 that is fixedly axially installed with the first adjustment unit 811, and a first gear 812, a second gear 813, and a third gear 814 that are sequentially driven and connected; the second gear 813 and the third gear 814 are both fixedly connected to the side close to the first beam limiting module with a first driving plate 815 for adjusting the swing angle of the corresponding first beam limiting module to achieve the relative opening and closing movement of the first beam limiting modules installed in pairs. The second gear 813 and the third gear 814 are synchronously meshed and rotated with a gear ratio of 1:1.

[0089] In this embodiment, with respect to the second adjustment mechanism 82, the second adjustment mechanism 82 includes a second adjustment unit 821 that is sequentially driven and connected, a fourth gear 822 that is fixedly axially mounted with the second adjustment unit 821, and a fourth gear 822, a fifth gear 823, and a sixth gear 824 that are sequentially driven and connected; the fifth gear 823 and the sixth gear 824 are both fixedly connected to the side close to the second beam limiting module with a second driving plate 826 that is used to adjust the swing angle of the corresponding second beam limiting module to achieve the relative opening and closing movement of the second beam limiting modules installed in pairs. The fifth gear 823 and the sixth gear 824 are set with the same gear ratio to ensure that the second beam limiting modules driven by the fifth gear 823 and the sixth gear 824, respectively, deflect synchronously. A rack 825 that meshes with the fourth gear 822 is fixedly arranged on the fifth gear 823. The fourth gear 822 adopts a bevel gear, and the rack 825 adopts an arc-shaped rack that meshes with the bevel gear, as shown in detail. Fig. 9 The drive structure shown is shown.

[0090] In order to facilitate manual adjustment and improve the stability of the limiting mechanism, the first adjustment unit 811 includes a turntable 8113 installed at the end of the main shaft connected to the first gear 812 for easy gripping and rotation, a first nut 8111 and a second nut 8112 threadedly connected to the main shaft, and an arc-shaped gasket 8110 installed between the first nut 8111 and the outer shell 1 for adjusting the rotation resistance of the turntable 8113. The first nut 8111 and the second nut 8112 are installed adjacent to each other, and the mutual interaction force formed by mutual abutment and extrusion can maintain the relative fixity of the first nut 8111, the second nut 8112 and the main shaft. During actual adjustment, the turntable 8113 is rotated to apply different pressures to the arc-shaped gasket 8110 to generate anti-rotation resistance to ensure the stability of the first adjustment unit 811 in any adjustment position.

[0091] For the convenience of configuration, the specific structure of the second adjusting unit 821 is the same as that of the first adjusting unit 811 .

[0092] In order to further realize the driving connection relationship between the adjustment mechanism and the beam limiting mechanism, preferably, both end surfaces of any first beam limiting module are fixedly connected with an axle pin 10, and the first driving plate 815 is provided with a strip groove 11 for accommodating the axle pin 10 at one end away from the second gear 813 and the third gear 814, and the first beam limiting module is directly or indirectly fixedly hinged to the outer shell 1 on the side away from the axle pin 10, so that the first beam limiting module can be positionally adjusted along the fixed hinge point under the drive of the first driving plates 815 on both sides.

[0093] Furthermore, the first beam-limiting module includes at least one layer of horizontally arranged first beam-limiting lead plates 911. The thickness of the specific lead plates or the number of the first beam-limiting lead plates 911 can be flexibly determined according to the effective protective effect of the radiation-proof lead sheet arranged on the outer shell 1; in order to ensure the safety of use of the present application, preferably, the first beam-limiting lead plates 911 can be arranged in multiple layers, such as two or three layers, and the total thickness of the arranged first beam-limiting lead plates 911 can block a radiation dose that is more than twice the actual X-ray radiation dose, so as to ensure the absolute safety of the present application during use and prevent radiation contamination and damage.

[0094] The two end surfaces of any second beam limiting module are fixedly connected with an axle pin 10, and the second drive plate 826 is provided with a strip groove 11 for accommodating the axle pin 10 at one end away from the fifth gear 823 and the sixth gear 824. The second beam limiting module is directly or indirectly fixedly hinged to the outer shell 1 at one side away from the axle pin 10, so that the second beam limiting module can be adjusted in position along the fixed hinge point under the driving of the second drive plates 826 on both sides. The second beam limiting module includes a second beam limiting lead plate 921 and a third beam limiting lead plate 922 arranged horizontally and overlapping each other.

[0095] In order to further improve the compatibility of the structure of the present application, preferably, the upper end surface of the outer shell 1 is also provided with a connector 3 for installing a tube, and the connector 3 is also provided with a locking rod 31 for locking the connector 3 and the tube. The locking rod 31 is connected to the connector 3 by a thread and the position of the locking rod 31 is adjusted to achieve the abutment or clamping locking of the connector 3 and the tube. Since another purpose of the invention of the present application is to provide a standard structure that can improve the beam limiting effect as much as possible while being compatible with standard tubes or X-ray machines on the market, the upper part of the connector 3 adopts a standard structure that can be quickly installed with existing tubes or X-ray machines. The connector 3 can be configured with more than one set of detachable connectors 3 for tubes or X-ray machines of different models that meet the radiation requirements of the present application, so as to further meet the needs of customers to match the existing mainstream tubes or X-ray machines with the beam limiter described in the present application, thereby reducing the cost investment of the entire X-ray irradiation system. Regardless of the type of connector 3, the lower part is detachably connected to the outer shell 1 using a standard interface. In order to further improve the safety of the present application, a lead layer for preventing radiation pollution is provided on any surface of the outer shell 1; a sealed irradiation plate 12 is fixedly installed on the lower surface of the outer shell 1 to prevent foreign matter from entering the beam limiter.

[0096] Brief description of adjustment method and beam limiting principle:

[0097] For the convenience of description, the directions involved in the principle description of this embodiment shall be based on the directions shown in the drawings. Figure 7 As shown, when it is necessary to adjust the longitudinal height of the ray field cross section, that is, to adjust the opening and closing degree of the first beam limiting unit 91, first hold the rotating disk 8113, as shown in FIG. Figure 8 The structure is shown, the turntable 8113 is rotated clockwise or counterclockwise, and the turntable 8113 rotates the main shaft fixedly connected thereto synchronously, thereby driving the first gear 812 to rotate. Since the first gear 812, the second gear 813, and the third gear 814 are meshed in sequence, and the second gear 813 and the third gear 814 are set at a gear ratio of 1:1, the second gear 813 and the third gear 814 respectively drive the first driving plate 815 fixedly connected thereto to deflect synchronously, and the first driving plate 815 drives the first beam limiting unit 91 to realize synchronous opening and closing movement, so as to realize the following Figure 7 The longitudinal height adjustment in the direction shown, that is, the two first beam limiting modules move synchronously relative to or towards each other, realizes the adjustment of the size of the effective irradiation cross section of the ray field.

[0098] Similarly, when the lateral width of the ray field section needs to be adjusted, Figure 7 In the position shown, when adjusting the opening and closing degree of the second beam limiting unit 92, first, hold the rotating disk 8113 in the second adjustment mechanism 82, as shown in FIG. Figure 8The structure is shown, the turntable 8113 is rotated clockwise or counterclockwise, and the turntable 8113 rotates the main shaft fixedly connected thereto synchronously, thereby driving the fourth gear 822 to rotate, and the fourth gear 822 is meshed with the rack 825. Since the rack 825 is integrally connected with the fifth gear 823 and the fifth gear 823 is synchronously meshed with the sixth gear 824, the fifth gear 823 and the sixth gear 824 respectively drive the second driving plate 826 fixedly connected thereto to deflect synchronously, and the second driving plate 826 drives the second beam limiting unit 92 to realize synchronous opening and closing movement, so as to realize the following Figure 7 The lateral width adjustment in the direction shown, that is, the two second beam limiting modules move synchronously relative to or towards each other, realizes the adjustment of the size of the effective irradiation cross section of the ray field.

[0099] Embodiment 4:

[0100] The present invention also provides a beam limiting method, which is implemented by using the above-mentioned multi-light path aggregate beam limiter.

[0101] The specific steps include:

[0102] Step S100 sets three independent emission points, which are respectively the focus 2 of the tube emitting X-rays, the LED light source 5 emitting visible light, and the laser 7 emitting cross lasers;

[0103] Step S200 debugs the three emission points in step S100 and satisfies the following conditions:

[0104] Step S210: Install the tube just above the beam limiter and ensure that the center ray of the X-ray emitted by the focus 2 of the tube is directed vertically downward and coincides with the theoretical center line of the passage;

[0105] Step S220: Install the laser 7 and the reflector 4 and meet the following conditions:

[0106] Step S2201: the emission point of the laser 7 and the focus 2 of the tube are mirror-symmetrical with respect to the reflection surface of the reflector 4;

[0107] Step S2202: the acute angle e formed by the central laser beam emitted by the laser 7 and the reflecting surface of the reflecting mirror 4 is equal to the acute angle f formed by the central X-ray emitted by the focus 2 of the tube and the reflecting surface of the reflecting mirror 4;

[0108] Step S230: Install the LED light source 5 and the mirror glass 6 and meet the following conditions:

[0109] Step S2301: the emission points of the LED light source 5 and the laser 7 are mirror-symmetrical with respect to the reflection surface of the mirror glass 6;

[0110] Step S2302: the acute angle h between the central light beam of the LED light source 5 and the reflecting surface of the mirror glass 6 is equal to the acute angle g formed by the central laser beam emitted by the laser 7 and the reflecting surface of the mirror glass 6;

[0111] Step S300 turns on the tube, and makes the intersection of the cross laser emitted by the laser 7 located at the center of the ray field within the target irradiation field, so that the ray field and the light field coincide.

[0112] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A multi-light path collective beam limiter, comprising a radiation-proof outer shell (1), wherein the outer shell (1) is provided with a passage from top to bottom for convenient X-ray irradiation emitted by a focus (2) of a tube arranged above the beam limiter, characterized in that: The outer shell (1) is also provided with an illumination unit for spatially overlapping the light field and the ray field, and a laser positioning unit for aligning the positioning laser center with the ray field center; a beam limiting mechanism (9) for adjusting the effective irradiation range of the ray field, and an adjustment mechanism (8) for driving the beam limiting mechanism to adjust the ray field; The lighting unit comprises an LED light source (5) mounted on the inner wall of the outer shell (1) for emitting a lighting beam, and a mirror glass (6) and a reflector (4) mounted in sequence along the propagation direction of the lighting beam, for reflecting the lighting beam so that the light field formed by the lighting beam coincides with the ray field; The laser positioning unit comprises a laser (7) directly or indirectly fixedly mounted on the inner wall of the outer shell (1), the emission point of the laser (7) and the focus of the tube (2) being mirror-symmetrical with respect to the reflection surface of the reflector (4); the acute angle e formed by the central laser beam emitted by the laser (7) and the reflection surface of the reflector (4) is equal to the acute angle f formed by the central X-ray emitted by the focus of the tube (2) and the reflection surface of the reflector (4); the LED light source (5) and the emission point of the laser (7) are mounted in mirror-symmetrical relation to the reflection surface of the mirror glass (6), and the acute angle h formed by the central light beam of the LED light source (5) and the reflection surface of the mirror glass (6) is equal to the acute angle g formed by the central laser beam emitted by the laser (7) and the reflection surface of the mirror glass (6); The upper end surface of the outer shell (1) is also provided with a connector (3) for mounting a tube, and the connector (3) is also provided with a locking rod (31) for locking the connector (3) and the tube, the locking rod (31) being connected to the connector (3) by means of a thread, and the abutment or clamping locking of the connector (3) and the tube is achieved by adjusting the position of the locking rod (31); any surface of the outer shell (1) is provided with a lead layer for preventing radiation contamination; and a sealing irradiation plate (12) for preventing foreign matter from entering the beam limiter is fixedly mounted on the lower surface of the outer shell (1).

2. The multi-light path aggregate beam limiter according to claim 1, characterized in that: After the illumination light beam emitted by the LED light source (5) is reflected by the mirror glass (6) and the reflector (4) in sequence, the edge light beam a coincides with the edge ray beam c.

3. The multi-light path aggregate beam limiter according to claim 1, characterized in that: The laser (7) is a discrete, continuous or cross-beam laser including a central laser, and the laser beam b at the outermost edge coincides with the ray beam c at the outermost edge after being reflected by the reflector (4); the illumination beam emitted by the LED light source (5) is reflected by the mirror glass (6) and the reflector (4) in sequence, and the beam a at the outermost edge coincides with the ray beam c at the outermost edge.

4. A multi-light path aggregate beam limiter according to any one of claims 1 to 3, characterized in that: The adjustment mechanism (8) comprises a first adjustment mechanism (81) and a second adjustment mechanism (82) which are independently manually controlled, and the beam limiting mechanism (9) comprises a first beam limiting unit (91) and a second beam limiting unit (92); The first adjustment mechanism (81) drives and connects the first beam limiting unit (91), so that two first beam limiting modules symmetrically mounted on any opposite sides of the passage and constituting the first beam limiting unit (91) perform relative opening and closing movements; The second adjustment mechanism (82) drives and connects the second beam limiting unit (92), so that two second beam limiting modules symmetrically mounted on opposite sides of the passage perpendicular to the first beam limiting unit (91) and used to form the second beam limiting unit (92) perform relative opening and closing movements; The first adjustment mechanism (81) comprises a first adjustment unit (811) which is sequentially driven and connected, a first gear (812) which is fixedly axially mounted to the first adjustment unit (811), and a first gear (812), a second gear (813), and a third gear (814) which are sequentially driven and connected; the second gear (813) and the third gear (814) are both fixedly connected to a first drive plate (815) on a side close to the first beam limiting module and used for adjusting the swing angle of the corresponding first beam limiting module to achieve relative opening and closing movement of the first beam limiting modules installed in pairs; The second adjustment mechanism (82) comprises a second adjustment unit (821) which is sequentially driven and connected, a fourth gear (822) which is fixedly axially mounted to the second adjustment unit (821), and a fourth gear (822), a fifth gear (823), and a sixth gear (824) which are sequentially driven and connected; the fifth gear (823) and the sixth gear (824) are both fixedly connected to a second drive plate (826) on one side close to the second beam limiting module and used for adjusting the swing angle of the corresponding second beam limiting module to achieve relative opening and closing movement of the second beam limiting modules installed in pairs.

5. The multi-light path aggregate beam limiter according to claim 4, characterized in that: The fifth gear (823) is fixedly provided with a rack (825) meshing with the fourth gear (822); the first adjustment unit (811) comprises a turntable (8113) mounted on the end of a main shaft connected to the first gear (812) for easy gripping and rotation, a first nut (8111) and a second nut (8112) threadedly connected to the main shaft, and an arc-shaped gasket (8110) mounted between the first nut (8111) and the outer shell (1) for adjusting the rotation resistance of the turntable (8113); the specific structure of the second adjustment unit (821) is the same as that of the first adjustment unit (8111).

6. The multi-light path aggregate beam limiter according to claim 5, characterized in that: Both end surfaces of any of the first beam limiting modules are fixedly connected with an axle pin (10); one end of the first drive plate (815) away from the second gear (813) and the third gear (814) is provided with a strip groove (11) for accommodating the axle pin (10); the side of the first beam limiting module away from the axle pin (10) is directly or indirectly fixedly hinged to the outer shell (1), so that the first beam limiting module can be adjusted in position along the fixed hinge point under the drive of the first drive plates (815) on both sides; the first beam limiting module comprises at least one layer of a first beam limiting lead plate (911) horizontally arranged; Both end surfaces of any of the second beam-limiting modules are fixedly connected with an axle pin (10); one end of the second drive plate (826) away from the fifth gear (823) and the sixth gear (824) is provided with a strip groove (11) for accommodating the axle pin (10); the side of the second beam-limiting module away from the axle pin (10) is directly or indirectly fixedly hinged to the outer shell (1), so that the second beam-limiting module can be driven by the second drive plates (826) on both sides to achieve position adjustment along the fixed hinge point; the second beam-limiting module comprises a second beam-limiting lead plate (921) and a third beam-limiting lead plate (922) which are arranged horizontally and overlapped up and down.

7. A beam limiting method, characterized in that: The method is implemented by using a multi-light path collective beam limiter as described in any one of claims 1 to 3; specifically comprising the following steps: Step S100: setting three independent emission points, namely, the focus of the tube for emitting X-rays (2), the LED light source for emitting visible light (5), and the laser for emitting cross lasers (7); Step S200: Debug the three emission points in step S100 and meet the following conditions: Step S210: Install the tube directly above the beam limiter and ensure that the central ray of the X-ray emitted by the focus (2) of the tube is directed vertically downward and coincides with the theoretical center line of the passage; Step S220: Install the laser (7) and the reflector (4) and meet the following conditions: Step S2201: the emission point of the laser (7) and the focus point (2) of the tube are mirror-symmetrical with respect to the reflection surface of the reflector (4); Step S2202 The acute angle e formed by the central laser beam emitted by the laser (7) and the reflecting surface of the reflecting mirror (4) is equal to the acute angle f formed by the central X-ray emitted by the focus of the tube (2) and the reflecting surface of the reflecting mirror (4); Step S230: Install the LED light source (5) and the mirror display glass (6) and meet the following conditions: Step S2301 The emission points of the LED light source (5) and the laser (7) are mirror-symmetrical with respect to the reflection surface of the mirror glass (6); Step S2302 The acute angle h formed between the central light beam of the LED light source (5) and the reflective surface of the mirror glass (6) is equal to the acute angle g formed between the central laser beam emitted by the laser (7) and the reflective surface of the mirror glass (6); Step S300: Turn on the tube, and make the intersection of the cross laser emitted by the laser (7) in the target irradiation field be located at the center of the ray field, so that the ray field and the light field coincide.

Images