Radiation irradiation equipment and safety detection equipment

Abstract

A radiation irradiation device and safety detection equipment, comprising: a radiation source for providing radiation; a shielding shell having a chamber for accommodating the radiation source and an opening connected to the chamber, so that the radiation can radiate outward through the opening; a scale for obtaining position information of the radiation source; a control device for controlling the radiation source to move to a first position or a second position according to the position information of the radiation source; wherein the first position is a position where the radiation radiates outward through the opening; and the second position is a position where the radiation cannot radiate outward through the opening. The device of the embodiment of the present invention can realize the emission of higher frequency radiation, and at the same time can also reduce the impact force on the shielding shell caused by the emission of radiation, and reduce the radiation dose while reducing the difficulty of radiation protection.

Description

Technical Field

[0001] The present invention relates to the field of nuclear technology applications, and in particular to a ray irradiation device and safety detection equipment. Background Art

[0002] At present, radioactive safety detection equipment has been widely used in stations, subways, airports, customs, ports, nuclear power plants, government agencies, postal inspection centers, courts, conference venues, etc. The radiation passes through the object to be tested, and the detector set up on the other side collects the signal to obtain the intensity of the radiation after penetrating different substances. The density of the detected object is distinguished, and different grayscale images are obtained to conduct safety inspections on objects or vehicles.

[0003] A dual-projection radiation imaging detection technology for large trucks and containers is known, in which isotopes are set as radiation sources. The radiation source is usually placed in a heavy shielding room, and an emission hole for emitting radiation is opened on the shielding room. A shutter with a shielding function can block or expose the emission hole by reciprocating movement, so that the radiation can be emitted from the emission hole at a certain frequency to detect the object to be detected. However, due to the heavy structure of this shutter, the shutter opens and closes slowly, has a large impact force, a long opening time, and inaccurate positioning, resulting in a large radiation dose required for detection and a large shutter size.

[0004] Therefore, a radiation irradiation device and safety detection equipment with fast shutter opening and closing speed and small impact are needed. Summary of the invention

[0005] The present invention provides a radiation irradiation device and a safety detection device, aiming to provide a radiation irradiation device and a safety detection device with fast shutter opening and closing speed, small impact, and more accurate radiation source positioning.

[0006] According to one aspect of the present invention, a radiation irradiation device is provided, comprising: a radiation source for providing radiation; a shielding shell having a chamber for accommodating the radiation source and an opening connected to the chamber, so that the radiation can radiate outward through the opening; a scale for obtaining position information of the radiation source; and a control device for controlling the radiation source to move to a first position or a second position according to the position information of the radiation source; wherein the first position is a position where the radiation radiates outward through the opening; and the second position is a position where the radiation cannot radiate outward through the opening.

[0007] According to another aspect of the present invention, there is provided a safety detection device, comprising the above-mentioned radiation irradiation device.

[0008] The shielding shell of the radiation irradiation device provided by the embodiment of the present invention has an opening. The device of the embodiment of the present invention does not realize radiation of radiation by opening and closing a shutter, but a control device controls the radiation source to be located at a first position so that the radiation radiates outward through the opening, or a second position so that the radiation cannot radiate outward through the opening. Since the weight of the radiation source is much smaller than the weight of the shutter, the emission of radiation of a higher frequency can be achieved, and the impact force on the shielding shell caused by the emission of radiation can also be reduced. The position information of the radiation source can be accurately obtained through the scale. The control device controls the movement of the radiation source according to the position information of the radiation source, and can more accurately control the radiation source to be located at the first position or the second position. Since the position of the radiation source is accurate, the opening size can be reduced, thereby reducing the radiation dose and reducing the difficulty of radiation protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Features, advantages, and technical effects of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.

[0010] Figure 1 Schematic diagram showing the structure of a radiation irradiation device according to an embodiment of the present invention.

[0011] Explanation of the reference numerals: 10, radiation source; 20, shielding shell; 21, first chamber; 22, opening; 23, second chamber; 24, mounting hole; 30, scale; 40, control device; 50, mounting rod; 60, driving mechanism; 61, stator; 62, mover; 70, support; 71, base; 72, side wall; 73, guide rail; 74, slider; 75, pointer; 80, reset device; 81, bracket; 82, connecting ring; 91, first limit sensor; 92, second limit sensor. DETAILED DESCRIPTION

[0012] The features and exemplary embodiments of various aspects of the present invention will be described in detail below. In the detailed description below, many specific details are explained and illustrated to provide a comprehensive understanding of the present invention. However, it is obvious to those skilled in the art that the present invention can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by describing examples of the present invention. The present invention is not limited to any specific configuration proposed below, but covers any modifications, replacements and improvements made to the structure and components of the present invention without departing from the spirit of the present invention. In the accompanying drawings and the following description, known structures and technologies are not shown to avoid unnecessary confusion for understanding the technical solution of the present invention.

[0013] Figure 1It is a schematic diagram of the structure of a ray irradiation device provided in an embodiment of the present invention. The ray irradiation device can be installed in the detection channel of various types of safety detection equipment (not shown in the figure), and is used to emit detection rays to an object to be detected (for example, a vehicle or a container) as needed, and cooperate with detectors and other units arranged in the detection channel to detect the detection object.

[0014] See also Figure 1 The radiation irradiation device includes a radiation source 10 for providing radiation; a shielding shell 20 having a first chamber 21 for accommodating the radiation source 10 and an opening 22 connected to the first chamber 21, so that the radiation can radiate outward through the opening 22; a scale 30 for obtaining position information of the radiation source 10; a control device 40 for controlling the radiation source 10 to move to a first position or a second position according to the position information of the radiation source 10; wherein the first position is a position where the radiation radiates outward through the opening 22; and the second position is a position where the radiation cannot radiate outward through the opening 22.

[0015] The shielding shell 20 of the radiation irradiation device provided in the embodiment of the present invention has an opening 22. The device in the embodiment of the present invention does not realize radiation of radiation by opening and closing a shutter, but the control device 40 controls the radiation source 10 to be located at a first position so that the radiation radiates outward through the opening 22, or a second position so that the radiation cannot radiate outward through the opening. Since the weight of the radiation source 10 is much smaller than the weight of the shutter, the emission of higher frequency radiation can be achieved, and the impact force on the shielding shell 20 caused by the emission of radiation can also be reduced. The position information of the radiation source 10 can be accurately obtained through the scale 30. The control device 40 controls the movement of the radiation source 10 according to the position information of the radiation source 10, and can more accurately control the radiation source 10 to be located at the first position or the second position. Since the position of the radiation source 10 is accurate, the size of the opening 22 can be reduced, thereby reducing the radiation dose and reducing the difficulty of radiation protection.

[0016] In some optional embodiments, the shielding shell 20 is made of a material with shielding properties, which has good shielding effect and high strength. For example, it can be made of high-density metals or alloys such as lead, tungsten, lead alloy or tungsten alloy, uranium 238, etc. The main body of the shielding shell 20 is an elliptical spherical structure, which can be installed on the mounting seat of the radiation irradiation device of the detection channel. It has a first chamber 21 for accommodating the radiation source 10 inside, and the opening 22 provided on the shielding shell 20 can be selected to be opened as a circular hole or a slit-shaped opening according to actual irradiation needs. For example, Figure 1 As shown, an opening 22 can be directly opened on the main body of the shielding shell 20. Of course, the position of the opening 22 can be determined according to the position of the radiation source 10 in the chamber, as long as the radiation source 10 can have a first position that can be aligned with the opening 22 or a second position that deviates from the opening 22.

[0017] Since the opening 22 of the embodiment of the present invention is opened on the elliptical spherical structure, when the opening 22 is slit-shaped, the opening angle can be maximized on the shielding shell 20, so that the radiation irradiation device can have a larger opening angle while ensuring a good shielding effect, that is, presenting a wider radiation area. Therefore, it can be arranged as close to the detection object as possible to reduce the space occupied by the entire detection device. In some embodiments, when the opening 22 is slit-shaped, and because the shielding shell 20 itself has sufficient thickness, the opening 22 can also be used as a collimator of the radiation irradiation device to lead out the detection ray and constrain the shape and size of the detection ray, so that the ray is collimated into a larger fan-shaped area with the ray source 10 as the vertex and can involve the entire detection object. In this way, it can not only ensure that the ray provided by the ray source 10 is non-repetitive, non-leaky and has no dead angle, but also make the detection ray strictly aligned with the corresponding detector (not shown), improve the detection efficiency and the quality of the detection image presented, so that the object to be detected can be detected more accurately.

[0018] Of course, the structure of the above-mentioned shielding shell 20 is not limited to this. In order to ensure that its thickness is evenly distributed and easy to install, the shielding shell 20 in this embodiment adopts an ellipsoidal structure. In other embodiments, it can also be a cube, cylinder or other shell structure, as long as its thickness can meet the shielding requirements.

[0019] The embodiment of the present invention does not limit the type of the radiation source 10. For example, the radiation source 10 may be a gamma ray source. The gamma ray source includes an isotope radiation source, and specifically, may include: 60 Co. 137 Cs, 192 Ir, 75 Se, preferably 60 Co, with its high energy, can cooperate with the larger opening angle provided by the opening 22 to form a stronger fan-shaped scanning surface, so as to perform more accurate scanning and detection on the object to be detected.

[0020] In some optional embodiments, the radiation source 10 is installed in the chamber through the mounting portion, so the first chamber 21 inside the shielding shell 20 is correspondingly configured according to the shape of the mounting portion of the radiation source 10. The first position and the second position are formed according to the matching state between the radiation source 10 and the opening 22. The control device 40 can move the radiation source 10 relative to the opening 22 between the first position and the second position.

[0021] It can be understood that the mounting part can be a mounting rod 50, which can be moved in the shielding shell 20, and the radiation source 10 is fixedly set on the mounting rod 50. The scale 30 is used to obtain the position information of the mounting rod 50, and the control device 40 is used to control the movement of the mounting rod 50 according to the position information of the mounting rod 50, so that the radiation source 10 is located at the first position or the second position.

[0022] In other optional embodiments, the radiation source 10 is fixedly disposed in the mounting rod 50, and the mounting rod 50 includes a thin-walled portion, which is located at a position on the mounting rod 50 opposite to the radiation source 10, that is, a position on the mounting rod 50 where the radiation of the radiation source 10 is emitted, and the wall thickness of the thin-walled portion is less than or equal to a preset thickness value. In these optional embodiments, the preset thickness value can be set according to actual needs, as long as the radiation of the radiation source 10 can penetrate the mounting rod 50 and radiate when the wall thickness of the mounting rod 50 is less than or equal to the preset thickness value. The other positions on the mounting rod 50 except the thin-walled portion are made of shielding materials to prevent radiation from being emitted from other positions.

[0023] It is understood that in other optional embodiments, the first chamber 21 further includes a mounting hole 24, and the mounting rod 50 is located in the mounting hole 24 and can move in the mounting hole 24; the shielding shell 20 further includes a second chamber 23 provided at the second end of the mounting rod 50. In these optional embodiments, by providing the second chamber 23, the mounting rod 50 can be enclosed in the shielding shell 20 to prevent the mounting rod from being taken out of the mounting hole 24 at the second end of the mounting rod 50. Further, the second chamber 23 is provided with a lock, and the second chamber 23 cannot be opened to take out the mounting rod 50 without unlocking. In these optional embodiments, the difficulty of taking out the mounting rod 50 can be increased by the second chamber 23 and the lock in the second chamber 23, so as to prevent the user from accidentally taking out the mounting rod 50 and causing a radiation leakage accident. Specifically, in order to ensure the stability and safety of the radiation source 10 in the linear reciprocating motion, the mounting hole 24 is provided perpendicular to the opening 22, and the mounting rod 50 is reciprocatingly provided in the mounting hole 24.

[0024] In some optional embodiments, the difference between the diameter of the mounting hole 24 and the diameter of the mounting rod 50 is less than or equal to a preset difference. In these optional embodiments, the preset difference can be set according to actual needs, so that the radiation dose radiated from the end of the mounting hole 24 away from the second chamber 23 meets the shielding requirements. In these optional embodiments, since the radiation is radiated in a certain direction, when the diameter of the mounting hole 24 is small, that is, the gap between the mounting hole 24 and the mounting rod 50 is small, the radiation dose radiated is limited and can meet the shielding requirements.

[0025] In some other optional embodiments, the distance between the second position and the end of the mounting hole 24 away from the second chamber 23 is greater than or equal to the first preset distance. The first preset distance can be set according to actual needs, so that the radiation dose radiated from the end of the mounting hole 24 away from the second chamber 23 meets the shielding requirements.

[0026] In some other optional embodiments, the distance between the opening 22 and the end of the mounting hole 24 away from the second chamber 23 is greater than or equal to the second preset distance. The second preset distance can be set according to actual needs, so that the radiation dose radiated from the end of the mounting hole 24 away from the second chamber 23 meets the shielding requirements.

[0027] In some other optional embodiments, further, the radiation irradiation device also includes a driving mechanism 60, the driving mechanism 60 includes a stator 61 and a mover 62 that can reciprocate along the stator 61, the mover 62 is fixedly connected to the first end of the mounting rod 50, the scale 30 is used to obtain the position information of the mover 62, and the control device 40 is used to control the movement of the mover 62 according to the position information of the mover 62, so that the radiation source 10 is located at the first position or the second position. The second end of the mounting rod 50 can reciprocate in the mounting hole 24 and the second chamber 23. Specifically, the driving mechanism 60 adopts a linear motor, and the mover 62 of the linear motor is connected to the mounting rod 50 for transmission, or indirectly cooperates with the mounting rod 50 for transmission through the connecting rod. Of course, the present invention does not limit the connection method between the mover 62 and the mounting rod 50, as long as a detachable fixed connection between each other can be achieved. The control device 40 can control the movement of the mover 62, thereby driving the mounting rod 50 to perform a linear reciprocating motion along its axial direction in the mounting hole 24, so as to realize the movement of the ray source 10 and switch the ray source 10 between the first position and the second position. By utilizing the height characteristics of the linear motor, the control device 40 can quickly control the ray source 10 to move to the first position or the second position. According to the position information obtained by the scale 30, while ensuring the rapid control of the ray source 10 to move to the first position or the second position, the accuracy of the control can also be guaranteed.

[0028] In some optional embodiments, the cross-section of the mounting rod 50 may also be square, rectangular or other shapes, as long as it cooperates with the mounting hole 24 to achieve linear reciprocating motion.

[0029] In some optional embodiments, further, the radiation irradiation device also includes a support 70, the support 70 includes a base 71 and two side walls 72, the two side walls 72 are located on both sides of the base 71 along the axial direction of the mounting rod 50, and the stator 61 is fixedly arranged between the two side walls 72.

[0030] The base 71 is provided with a guide rail 73, and the mover 62 can reciprocate along the guide rail 73, so that the mover 62 reciprocates along the stator 61. In these optional embodiments, the guide rail 73 carries the mover 62 to reciprocate, thereby avoiding damage to components caused by the mover 62 being carried by the stator 61 to reciprocate due to insufficient strength of the stator 61.

[0031] There are many ways to implement the connection between the mover 62 and the guide rail 73. As an optional implementation, the guide rail 73 also includes a slider 74 that can reciprocate along the guide rail 73, and the mover 62 and the slider 74 are connected.

[0032] In other optional embodiments, the scale 30 is arranged at the bottom of the guide rail 73, and the measuring direction of the scale 30 is consistent with the reciprocating direction of the mover 62. The slider 74 is provided with a pointer 75, and the top of the pointer 75 points to the side of the scale 30 close to the slider 74, which is used to indicate the scale displayed on the scale 30. In these optional embodiments, the top of the pointer 75 points to the scale 30, so the position information of the slider 74 can be read from the scale 30, that is, the position information of the mover 62 connected to the slider 74. Of course, the scale 30 can also be set at other positions, as long as the scale 30 can obtain the position information of the mover 62.

[0033] In some other optional embodiments, the radiation irradiation device further includes a reset device 80 fixedly connected to the mover 62, and the reset device 80 resets and deforms to move the mover 62 so that the radiation source 10 is located at the first position or the second position. Optionally, the reset device 80 can be an uninterruptible power supply (English full name: Uninterruptible Power System / Uninterruptible Power Supply, English abbreviation: UPS), a super capacitor or a compression spring.

[0034] Specifically, the reset device 80 is a compression spring, the first end of which is connected to the mover 62, and the elastic deformation of the compression spring moves the mover 62, so that the radiation source 10 is located at the first position or the second position. In some optional embodiments, when the mover 62 moves from the first position corresponding to the radiation source 10 to the second position corresponding to the radiation source 10, the mover 62 performs a movement to compress the compression spring. Specifically, when the mover 62 is located at the position corresponding to the second position of the radiation source 10, the compression spring is in a naturally extended state, and when the mover 62 is located at the position corresponding to the first position of the radiation source 10, the compression spring is in a compressed state. In these optional embodiments, when the radiation source 10 emits radiation and a power failure occurs suddenly, the elastic force of the compression spring moves the mover 62 to the position corresponding to the second position of the radiation source 10, so that the radiation cannot be radiated from the opening 22.

[0035] In some optional embodiments, the radiation irradiation device further includes a bracket 81 having one end fixedly disposed on the shielding shell 20, a compression spring sleeved on the bracket 81, a first end of the compression spring fixedly connected to the mover 62 via a connecting ring 82, the connecting ring 82 sleeved on the bracket 81, and a second end of the compression spring fixedly disposed on the shielding shell 20. Of course, one end of the bracket 81 can also be fixed to other positions of the radiation irradiation device of this embodiment, and similarly, the second end of the compression spring can also be fixed to other positions of the radiation irradiation device of this embodiment. In these optional embodiments, when the mover 62 moves under the elastic force of the compression spring, the mover 62 can be ensured to move along the bracket 81 due to the limiting effect of the bracket 81 and the connecting ring 82. Further optionally, the bracket 81 is arranged in parallel with the stator 61, and the mover 62 reciprocates along the bracket 81, so that the mover 62 reciprocates along the stator 61.

[0036] In some other optional embodiments, the moving stroke of the mover 62 is greater than or equal to the distance between the first position and the second position. In these optional embodiments, the moving stroke of the mover 62 can ensure that the mover 62 drives the ray source 10 to move to the first position or the second position.

[0037] In some other optional embodiments, the radiation irradiation device further includes a first limit sensor 91 and / or a second limit sensor 92, wherein the first limit sensor 91 is used to determine whether the radiation source 10 is located at the first position, and the second limit sensor 92 is used to determine whether the radiation source 10 is located at the second position; the control device 40 is also used to determine whether to control the radiation source 10 to stop moving according to the judgment results of the first limit sensor 91 and / or the second limit sensor 92. In these optional embodiments, when the control device 40 is used to control the radiation to radiate outwards, and the first limit sensor 91 determines that the radiation source 10 is located at the first position, the control device 40 controls the radiation source 10 to stop moving; when the control device 40 is used to control the radiation not to radiate outwards, and the second limit sensor 92 determines that the radiation source 10 is located at the second position, the control device 40 controls the radiation source 10 to stop moving. Among them, the control device 40 is also used to determine the corresponding positions of the first position and the second position of the radiation source 10 on the scale 30 according to the position information obtained by the scale 30, the first limit sensor 91 is set at the position on the scale 30 corresponding to the first position of the radiation source 10, and the second limit sensor 92 is set at the position on the scale 30 corresponding to the second position of the radiation source 10.

[0038] The second embodiment of the present invention provides a safety detection device, including the radiation irradiation device in any of the above embodiments. The safety detection device provided in the embodiment of the present invention (taking vehicle detection as an example) is equipped with the above-mentioned radiation irradiation device, and the radiation irradiation device can be installed on the bottom surface, top surface or side surface of the detection channel of the safety detection device. Preferably, the radiation irradiation device is installed on the bottom surface of the detection channel. Since the radiation irradiation device in the embodiment of the present invention has a large radiation angle, during the detection process, it is installed on the bottom surface of the detection channel, maintaining a close distance with the detection vehicle while having a wide radiation area, which is conducive to presenting a clearer detection image.

[0039] According to an embodiment of the present invention, the above-mentioned safety detection equipment also includes a sensor for detecting the vehicle to be detected in the detection channel. After the sensor detects that the moving target enters the detection channel of the safety detection equipment and the cab passes over the radiation irradiation device, the information is transmitted to the control device 40. The control device 40 controls the radiation source 10 to move to the opening 22 of the shielding shell 20, and cooperates with the detector arranged in the detection channel to scan and detect the vehicle to be detected. Of course, according to the needs, the radiation source 10 can be continuously placed at the opening 22 to scan the detection vehicle or the driving mechanism 60 can drive the radiation source 10 to move periodically to scan the detection vehicle. When the sensor detects that the detection of the detection vehicle is completed, the information is transmitted to the control device 40 again, and the control device 40 controls the radiation source 10 to move to the second position, and the vehicle can drive out of the detection channel. The safety detection equipment in this embodiment is equipped with the above-mentioned radiation irradiation device, and can control the rapid opening or closing of the shutter of the radiation irradiation device according to the entry of the vehicle to be detected, so as to conveniently, quickly and reasonably control the radiation irradiation device, improve the detection efficiency, ensure the accuracy of the detection result, and avoid the radiation irradiation device itself from being impacted.

Claims

1. A radiation irradiation device, comprising: A radiation source, used for providing radiation; A shielding shell having a first chamber for accommodating the radiation source and an opening communicating with the first chamber, so that the radiation can radiate outward through the opening; A scale, used for obtaining position information of the ray source; A control device, used for controlling the ray source to move to a first position or a second position according to the position information of the ray source, wherein the first position is a position where the ray radiates outward through the opening, and the second position is a position where the ray cannot radiate outward through the opening; a mounting rod, the mounting rod being movable in the shielding shell, the radiation source being fixedly mounted on the mounting rod, the scale being used for acquiring position information of the mounting rod, the control device being used for controlling the movement of the mounting rod according to the position information of the mounting rod so that the radiation source is located at the first position or the second position, the first chamber further comprising a mounting hole, the mounting rod being located in the mounting hole and being movable in the mounting hole; the shielding shell further comprising a second chamber disposed at a second end of the mounting rod; a driving mechanism, the driving mechanism comprising a stator and a mover that can reciprocate along the stator, the mover being fixedly connected to the first end of the mounting rod, the scale being used to obtain position information of the mover, and the control device being used to control the movement of the mover according to the position information of the mover, so that the radiation source is located at the first position or the second position; a reset device, wherein the reset device is fixedly connected to the mover, and the reset device is reset and deformed to move the mover so that the ray source is located at the first position or the second position; Wherein, the reset device is a compression spring, a first end of the compression spring is connected to the mover, and elastic deformation of the compression spring moves the mover so that the radiation source is located at the first position or the second position; Furthermore, it also includes a bracket with one end fixedly arranged on the shielding shell, the compression spring is sleeved on the bracket, the first end of the compression spring is fixedly connected to the mover through a connecting ring, the connecting ring is sleeved on the bracket, and the second end of the compression spring is fixedly arranged on the shielding shell.

2. The radiation irradiation device according to claim 1, wherein: The difference between the diameter of the mounting hole and the diameter of the mounting rod is less than or equal to a preset difference.

3. The radiation irradiation device according to claim 1, wherein: Furthermore, it also includes a support, which includes a base and two side walls, the two side walls are located on both sides of the base along the axial direction of the mounting rod, and the stator is fixedly arranged between the two side walls.

4. The radiation irradiation device according to claim 3, wherein: A guide rail is arranged on the base, and the mover can reciprocate along the guide rail so that the mover can reciprocate along the stator.

5. The radiation irradiation device according to claim 4, wherein: The guide rail further comprises a slider which can reciprocate along the guide rail, and the mover is connected to the slider.

6. The device according to claim 5, wherein: The scale is arranged at the bottom of the guide rail, and the measuring direction of the scale is consistent with the reciprocating motion direction of the mover. A pointer is arranged on the slider, and the top of the pointer points to the side of the scale close to the slider, which is used to indicate the scale displayed on the scale.

7. The radiation irradiation device according to claim 1, wherein: The moving stroke of the mover is greater than or equal to the distance between the first position and the second position.

8. The radiation irradiation device according to claim 1, wherein: Further comprising a first limit sensor and / or a second limit sensor, wherein the first limit sensor is used to determine whether the radiation source is located at the first position, and the second limit sensor is used to determine whether the radiation source is located at the second position; The control device is further used to determine whether to control the ray source to stop moving according to the judgment result of the first limit sensor and / or the second limit sensor.

9. A safety detection device comprising: A radiation irradiation device as claimed in any one of claims 1 to 8.

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