WO2023050976A1

WO2023050976A1 - Swing-type high-power x-ray conversion target device

Info

Publication number: WO2023050976A1
Application number: PCT/CN2022/105728
Authority: WO
Inventors: 陆洁平; 倪晓敏; 査军; 肖珺; 陈海
Original assignee: 中广核达胜加速器技术有限公司
Priority date: 2021-09-30
Filing date: 2022-07-14
Publication date: 2023-04-06
Also published as: CN113782406A

Abstract

The present invention relates to a swing-type high-power X-ray conversion target device, comprising a conversion target and a supporting assembly configured to support the conversion target, wherein the conversion target and the supporting assembly are arranged below a scanning window; the supporting assembly comprises a supporting frame and an electric motor driving mechanism; the supporting frame comprises a frame body and guide rails provided on two sides of the frame body; the guide rails on the two sides are each provided with the electric motor driving mechanism; the electric motor driving mechanism comprises a driving electric motor, a pulley, and a connecting plate; the pulley is provided on the guide rail; the driving electric motor drives the pulley to move and drives the connecting plate to move along with the pulley; and the connecting plate is hinged to the conversion target. The supporting assembly drives the conversion target to perform a reciprocating linear motion and a reciprocating swing motion, so that long-time bombardment by an electron beam on the same position of a target is avoided, the service life of the target is prolonged, and the uniformity of the output of X-rays is improved; and a cooling-liquid pipe is provided at the lower end of a metal composite plate of the conversion target, so that a good cooling effect is ensured, and the problems of direct contact between a cooling liquid and a heavy metal plate, hidden corrosion hazards of there being no target, and the replacement of a sealing ring are also solved.

Description

A swinging high-power X-ray conversion target device

technical field

The invention belongs to the technical field of radiation processing, and in particular relates to a swinging high-power X-ray conversion target device.

Background technique

In the field of irradiation processing technology, in order to make up for the limitations in the practical application of irradiation processing caused by the weak penetrating power of electron beams, low utilization rate of gamma rays and fixed attenuation, electron beams with high energy and large beam work are used to bombard heavy metal targets. The obtained X-ray source has both the advantages of the above two types of rays. However, in recent years, the development of domestic γ-irradiation sources has been limited due to the insufficient supply of cobalt-60 source market, the decommissioning of sources, and the environmental problems of γ-irradiation devices. It can be expected that using high-energy electron beams or using high-energy electron beams to target X-rays to replace cobalt sources will be one of the development trends in the future radiation processing industry.

In the radiation processing industry, in order to realize the large-scale production of radiation processing using X-rays, the X-ray power converted by electron beams needs to reach a certain level. Existing X-ray conversion target products are restricted by the X-ray conversion rate of electron beam conversion. Usually, the ideal X-ray conversion target is obtained by selecting a heavy metal plate with an optimal thickness and high atomic number as the conversion target, and increasing the energy and beam current of the electron beam. Ray power output. The high power of the electron beam generated by the high energy and large beam current will directly act on the heavy metal plate layer on the surface of the X-ray conversion target to achieve the output of X-rays less than 10% of the total power, and the rest of the energy will be released through heat energy. Therefore, the conversion target needs to have good overall heat dissipation performance and needs to have external cooling. Generally, the conversion target needs cooling liquid to cool the target material layer of the conversion target.

At present, there are generally two types of X-ray conversion target structures for high-power electrons. One is to design a cooling liquid layer between the heavy metal plate material layer and the light metal material layer, and then fasten the sealing ring with bolts to realize the sealing of the cooling liquid layer and the cooling effect of the target. In this way, the liquid flow in the cooling liquid layer is very wide and long, which easily leads to uneven liquid flow velocity, and easily produces air bubbles that affect the cooling effect of the cooling liquid on the conversion target. Moreover, the direct contact between the cooling liquid and the target will also affect the target. There is a certain corrosion effect, and the long-term electron beam acts on the same area of the target, etc., which greatly affect the service life of the target. At the same time, due to the need to replace the sealing ring regularly, it also increases maintenance costs and reduces radiation production capacity. The other is to directly weld the heavy metal material layer and the light metal material layer together, and then weld the heat conduction coolant pipe under the light metal material layer. The disadvantage of this method is that the heat-conducting coolant pipeline has a certain absorption effect on X-rays, thereby affecting the uniformity of X-ray output.

Contents of the invention

Aiming at the above-mentioned problems existing in the prior art, the present invention provides a swinging high-power X-ray conversion target device. The support assembly of the conversion target can drive the conversion target to reciprocate linear motion and reciprocating swinging motion, so that the electron beam will not fall on the target. Bombarding at the same position for a long time avoids target deformation or premature damage caused by local overheating of the conversion target, and effectively improves the uniformity of X-ray output; in addition, the conversion target is realized by combining heavy and light metal composite plates and coolant pipes The generation of X-rays and the filtration of low-energy rays after bombardment by high-energy electron beams not only have high conversion efficiency, but also can avoid direct contact between the coolant and the heavy metal plate while ensuring a good cooling effect, without target corrosion hidden dangers and sealing The problem of ring replacement is simple, the reliability is high, and the service life is long.

The technical solution adopted by the present invention to solve the technical problem is: a swinging high-power X-ray conversion target device, including a conversion target and a support assembly for supporting the conversion target, and the conversion target and support assembly are arranged under the scanning window , the support assembly includes a support frame and a motor drive mechanism, the support frame includes a frame body and guide rails arranged on both sides of the frame body, the guide rails on both sides are provided with a motor drive mechanism, and the motor drives The mechanism includes a drive motor, a pulley and a connecting plate, the pulley is arranged on the guide rail, the driving motor drives the pulley to move, and drives the connecting plate to move with the pulley, and the connecting plate is hinged to the conversion target .

Further specifically, a limit travel switch is provided at the end of the guide rail.

More specifically, the guide rails include a first guide rail and a second guide rail arranged in parallel, and the pulley is clamped between the first guide rail and the second guide rail.

More specifically, the conversion target includes a metal composite plate, a number of cooling liquid pipes arranged under the metal composite plate, side fixing frames arranged on both sides of the short side of the metal composite The cooling liquid input pipe and the cooling liquid output pipe on both sides of the long side of the plate, the cooling liquid pipe is arranged between the cooling liquid input pipe and the cooling liquid output pipe, the cooling liquid input pipe, the cooling liquid output pipe and several The cooling liquid pipes communicate with each other, the metal composite plate includes a heavy metal plate and a light metal plate arranged under the heavy metal plate, a number of arc-shaped grooves are arranged at the bottom of the light metal plate, and the cooling liquid pipe is arranged in the arc-shaped groove superior.

Further specifically, the cooling liquid pipe is arranged along a direction parallel to the short side of the conversion target.

More specifically, the hinge structure between the connecting plate and the conversion target is that a connection hole is opened on the side fixing frame of the conversion target, and the connection plate is connected with the connection hole through a bolt, and the connection hole is Waist-shaped hole, the longer axis of the connection hole is perpendicular to the short side direction of the conversion target.

More specifically, the depth of the arc-shaped groove of the light metal plate is 50-65% of the thickness of the metal composite plate.

Further specifically, the material of the heavy metal plate in the metal composite plate is one of tantalum, tungsten, and gold.

Further specifically, the material of the light metal plate in the metal composite plate is one of copper and aluminum.

More specifically, when the light metal plate is a copper plate, the cooling liquid pipe is a copper pipe, and when the light metal plate is an aluminum plate, the cooling liquid pipe is an aluminum pipe.

The beneficial effects of the present invention are:

(1) The motor drive mechanism is set on the support assembly of the conversion target, which can drive the conversion target to reciprocate linear motion and swing motion, so that the electron beam will not bombard the same position of the target for a long time, and avoid the target deformation or advance due to local overheating of the conversion target Damage, prolong the service life of the target, and effectively improve the uniformity of X-ray output;

(2) The lower end of the metal composite plate of the conversion target is provided with a number of coolant pipes, so that the coolant will not directly contact the metal composite plate, avoiding the risk of the metal composite plate being corroded by the coolant, and improving the overall service life of the target. Moreover, the drawbacks in the prior art that the coolant needs to be isolated and sealed by sealing materials such as sealing rings, and the sealing rings need to be replaced regularly are eliminated;

(3) The cooling liquid pipe is arranged parallel to the short side of the conversion target, which shortens the distance of the cooling liquid flowing from the cooling liquid input pipe to the cooling liquid output pipe, improves the heat exchange rate, and makes the flow rate of the cooling liquid more uniform, thereby Better cool down the metal composite board and improve the overall heat dissipation performance of the conversion target;

(4) There are several arc-shaped grooves on the bottom of the metal composite plate of the conversion target, and the coolant pipe is arranged on the arc-shaped groove, which effectively increases the contact area between the coolant pipe and the metal composite plate, and enhances the cooling capacity of the coolant. The heat exchange capacity of the tube further improves the cooling effect of the conversion target.

Description of drawings

Figure 1 is a schematic diagram of the structure of the swing type high-power X-ray conversion target device of the present invention;

Fig. 2 is the structural schematic diagram II of the oscillating high-power X-ray conversion target device of the present invention;

Fig. 3 is the front view of the X-ray conversion target of the present invention;

Fig. 4 is a sectional view of the X-ray conversion target of the present invention;

Fig. 5 is a partially enlarged view of the X-ray conversion target of the present invention;

Fig. 6 is a schematic diagram of the reciprocating linear motion of the conversion target on the support assembly of the present invention;

Fig. 7 is a schematic diagram of the reciprocating swinging movement of the conversion target on the support assembly according to the present invention.

In the figure: 10, conversion target; 110, metal composite plate; 111, heavy metal plate; 112, light metal plate; 1121, arc-shaped groove; 120, cooling liquid pipe; 130, side fixing frame; Coolant input pipe; 150, coolant output pipe; 20, support assembly; 210, support frame; 211, frame body; 212, guide rail; 2121, first guide rail; 2122, second guide rail; 220, motor drive mechanism; , drive motor; 222, pulley; 223, connecting plate; 2231, bolt; 230, limit travel switch.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

As shown in FIG. 1 , a swinging high-power X-ray conversion target device includes a conversion target 10 and a support assembly 20 for supporting the conversion target 10 , and the conversion target 10 and support assembly 20 are arranged below the scanning window.

As shown in Fig. 3, Fig. 4 and Fig. 5, the conversion target 10 includes a metal composite plate 110, a plurality of cooling liquid pipes 120 arranged under the metal composite plate 110, and side fixing frames 130 arranged on both short sides of the metal composite plate 110. And the cooling liquid input pipe 140 and the cooling liquid output pipe 150 respectively disposed on both sides of the long side of the metal composite plate 110 , the cooling liquid pipe 120 is disposed between the cooling liquid input pipe 140 and the cooling liquid output pipe 150 .

The coolant inlet pipe 140 and the coolant outlet pipe 150 are oppositely provided with several holes, the inner diameter of the holes is consistent with the inner diameter of the coolant pipe 120, and the coolant pipe 120 is welded at the corresponding holes so that it is connected with the coolant input. The pipe 140 communicates with the coolant output pipe 150 . The cooling liquid enters from the cooling liquid input pipe 140 , flows through all the cooling liquid pipes 120 and finally flows out from the cooling liquid output pipe 150 to cool down the metal composite plate 110 . The cooling liquid will not directly contact the metal composite plate 110, avoiding the risk of the metal composite plate 110 being corroded by the cooling liquid, improving the service life of the target as a whole, and abandoning the prior art that needs sealing materials such as sealing rings to isolate, The downside of sealing the coolant and requiring periodic replacement of the seals.

As shown in FIG. 5 , the metal clad plate 110 includes a heavy metal plate 111 and a light metal plate 112 disposed below the heavy metal plate 111 , and the heavy metal plate 111 and the light metal plate 112 are combined through an explosive composite process. The heavy metal plate 111 is used to receive high-energy and high-power electron beam bombardment. When the high-energy electron beam bombards the heavy metal plate 111, bremsstrahlung occurs in the heavy metal plate 111 to generate X-rays. Since the conversion efficiency of X-rays is related to the atomic number, the higher the atomic number is, the higher the corresponding conversion efficiency is. Therefore, the material of the heavy metal plate 111 is a metal material with a high atomic number, such as tantalum, tungsten, and gold in this embodiment. one of them. The light metal plate 112 is made of copper or aluminum with high thermal conductivity and low atomic number. On the one hand, the light metal plate 112 under the heavy metal plate 111 is used to block the electron beam passing through the heavy metal plate 111, so as to ensure that the irradiated product can only receive X-ray irradiation but not electron beam irradiation, and at the same time obtain a suitable electron conversion X The energy of the ray can effectively filter the remaining electrons of the ray and the low-energy part of the X-ray to realize the hardening of the X-ray. On the other hand, the light metal plate 112 is in direct contact with the heavy metal plate 111, which can better dissipate heat for the heavy metal plate 111.

As shown in FIG. 5 , a plurality of arc-shaped grooves 1121 are provided at the bottom of the light metal plate 112 , and the cooling liquid pipe 120 is attached to the arc-shaped grooves 1121 and fixed on the arc-shaped grooves 1121 by welding. The cooling liquid pipe 120 is a copper or aluminum pipe with high thermal conductivity and low atomic number, and in order to facilitate welding, when the light metal plate 112 is a copper plate, the cooling liquid pipe 120 is a copper pipe; when the light metal plate 112 is an aluminum plate , The coolant pipe 120 is an aluminum pipe. The depth of the arc-shaped groove 1121 is 50-65% of the thickness of the metal composite plate 110, to ensure that the light metal coolant pipe 120 is not in direct contact with the heavy metal plate 111, and the coolant pipe 120 and the metal composite plate 110 should be as large as possible. contact area, so that the metal composite plate 110 can be cooled better.

As shown in Figure 3, several cooling liquid pipes 120 are evenly arranged along the short side direction parallel to the conversion target 10, which effectively shortens the flow of the cooling liquid from the cooling liquid input pipe compared to the arrangement along the long side direction parallel to the conversion target 10. The distance from 140 to the cooling liquid output pipe 150 increases the heat exchange rate and makes the cooling liquid flow rate more uniform, thereby better cooling the metal composite plate 110 and improving the overall heat dissipation performance of the conversion target 10 .

When the high-energy electron beam bombards the X-ray conversion target 10 , part of the energy is converted into X-rays, and other energy is converted into heat and deposited on the surface of the conversion target 10 . In order to avoid deformation or damage of the conversion target 10 due to local overheating caused by electron beam bombardment at the same position of the target for a long time, as shown in Fig. 1 and Fig. Support assembly 20 for oscillating motion. The support assembly 20 includes a support frame 210 and a motor drive mechanism 220, the support frame 210 includes a frame body 211 and guide rails 212 arranged on both sides of the frame body 211, and the guide rails 212 on both sides are provided with a motor drive mechanism 220, the motor driving mechanism 220 includes a driving motor 221, a pulley 222 and a connecting plate 223, the pulley 222 is arranged on the guide rail 212, the driving motor 221 drives the moving of the pulley 222, and drives the connecting plate 223 moves with the pulley 222, and the connecting plate 223 is hinged to the conversion target 10. The support assembly 20 has a simple structure, avoids the electron beam bombarding the same position of the target for a long time, and improves the service life and reliability of the conversion target 10 .

In this embodiment, the guide rail 212 includes a first guide rail 2121 and a second guide rail 2122 arranged in parallel, and the pulley 222 is clamped between the first guide rail 2121 and the second guide rail 2122 . One end of the pulley 222 is connected to the driving motor 221 , and the other end is connected to the connecting plate 223 , so that the driving motor 221 can drive the connecting plate 223 to move through the pulley 222 .

The support assembly 20 also includes a travel limit switch 230 for controlling the motion state of the drive motor 221 , the travel limit switch 230 is disposed on the frame body 211 and located at the end of the guide rail 212 .

As shown in Fig. 2 and Fig. 3, a connection hole 131 is provided on the side fixing frame 130 of the conversion target 10. The edge direction is vertical, and the connecting plate 223 is hinged with the conversion target 10 through the cooperation of the bolt 2231 and the connecting hole 131 . Since the connection hole 131 is a waist-shaped hole, the conversion target 10 disposed on the support assembly 20 can move left and right for a certain distance in the horizontal direction, so that the conversion target 10 can swing on the support assembly 20 .

As shown in FIG. 6 , when the motor drive mechanisms 220 on both sides of the conversion target 10 run in the same direction, the linear movement of the conversion target 10 can be realized. The specific movement process is: the drive motors 221 on both sides of the guide rail 212 drive the pulleys 222 on the guide rails 212 on both sides to slide in the same direction, and drive the connecting plate 223 to move with the pulley 222, and the conversion target 10 moves in parallel with the connecting plates 223 on both sides. After the connecting plate 223 hits the limit travel switch 230 arranged at the end of the guide rail 212, the driving motor 221 is triggered to reverse, and the connecting plate 223 is driven to switch from the original running direction to the opposite direction with the pulley 222, and the conversion target 10 also follows the pulley 222. The connecting plates 223 on both sides move in parallel in opposite directions to realize the reciprocating linear motion of the conversion target 10 within a certain distance.

As shown in Figure 7, when the motor drive mechanisms 220 on both sides of the conversion target 10 run in opposite directions, the swing motion of the conversion target 10 can be realized. The specific movement process is: the driving motors 221 on both sides of the guide rail 212 drive the pulleys 222 on the guide rails 212 on both sides to slide towards the opposite direction, and drive the connecting plates 223 on both sides to move towards each other, and the short sides of the conversion target 10 are hinged to the connecting plates 223 , so that both sides of the short side of the conversion target 10 move toward each other with the connecting plates 223 on both sides. When the connecting plate 223 touches the limit travel switch 230 arranged at the end of the guide rail 212, the driving motor 221 is triggered to reverse and drive the connecting plate 223 moves in the opposite direction as the pulley 222 switches from the original running direction, and the short sides of the corresponding conversion target 10 move in opposite directions, thereby realizing the reciprocating swing motion of the conversion target 10 on the support assembly 20 . The reciprocating swinging motion of the conversion target 10 on the support assembly 20 makes the area irradiated by the electron beam on the conversion target 10 change continuously at a certain angle, thereby improving the absorption of X-rays by the cooling liquid pipe 120 under the metal composite plate 110, Effectively improve the overall output uniformity of X-rays.

To sum up, the present invention provides a swing-type high-power X-ray conversion target device. The support assembly 20 of the conversion target 10 can drive the conversion target 10 to reciprocate linear motion and reciprocating swing motion, so that the electron beam will not stay at the same position of the target for a long time. Time bombardment avoids target deformation or premature damage caused by local overheating of the conversion target 10, and has a simple structure, high reliability, and effectively improves the uniformity of X-ray output; moreover, the conversion target 10 adopts a metal composite plate 110 and a cooling liquid tube 120 to achieve the generation of X-rays after bombardment by high-energy electron beams and the filtration of low-energy rays, which not only has a high conversion efficiency, but also can avoid direct contact between the cooling liquid and the heavy metal target while ensuring a good cooling effect. There is no hidden danger of target corrosion and replacement of sealing rings; at the same time, the cooling liquid pipe 120 is arranged along the short side direction parallel to the conversion target 10, shortening the distance for the cooling liquid to flow from the cooling liquid input pipe 140 to the cooling liquid output pipe 150, The heat exchange rate is improved, and the flow rate of the coolant is more uniform, so as to better cool down the metal composite plate 110 and improve the overall heat dissipation performance of the conversion target 10; in addition, the bottom of the metal composite plate 110 has several arc-shaped grooves 1121, the cooling liquid pipe 120 is arranged on the arc-shaped groove 1121, which effectively increases the contact area between the cooling liquid pipe 120 and the metal composite plate 110, enhances the heat exchange capacity of the cooling liquid pipe 120, and further improves the heat exchange rate of the conversion target 10. cooling effect.

It should be emphasized that: the above are only preferred embodiments of the present invention, and are not intended to limit the present invention in any form. Any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention are valid. Still belong to the scope of the technical solution of the present invention.

Claims

A swinging high-power X-ray conversion target device, comprising a conversion target (10) and a support assembly (20) for supporting the conversion target (10), the conversion target (10) and the support assembly (20) are arranged in a scanning Below the window, it is characterized in that the support assembly (20) includes a support frame (210) and a motor drive mechanism (220), and the support frame (210) includes a frame body (211) and is arranged on the frame body (211) ) guide rails (212) on both sides, the guide rails (212) described on both sides are all provided with a motor drive mechanism (220), and the motor drive mechanism (220) includes a drive motor (221), a pulley (222) and a connection plate (223), the pulley (222) is arranged on the guide rail (212), the drive motor (221) drives the pulley (222) to move, and drives the connecting plate (223) to follow the pulley (222) ) movement, the connecting plate (223) is hinged with the conversion target (10).
The swing-type high-power X-ray conversion target device according to claim 1, characterized in that a limit travel switch (230) is arranged at the end of the guide rail (212).
The swinging high-power X-ray conversion target device according to claim 1, characterized in that, the guide rail (212) includes a first guide rail (2121) and a second guide rail (2122) arranged in parallel, and the pulley (222 ) is clamped between the first guide rail (2121) and the second guide rail (2122).
The oscillating high-power X-ray conversion target device according to claim 1, characterized in that the conversion target (10) comprises a metal composite plate (110), and several cooling devices arranged under the metal composite plate (110). The liquid pipe (120), the side fixing frame (130) arranged on both sides of the short side of the metal composite plate (110), and the cooling liquid input pipes (140) respectively arranged on both sides of the long side of the metal composite plate (110) ) and the cooling liquid output pipe (150), the cooling liquid pipe (120) is arranged between the cooling liquid input pipe (140) and the cooling liquid output pipe (150), the cooling liquid input pipe (140), The cooling liquid output pipe (150) communicates with several cooling liquid pipes (120), and the metal composite plate (110) includes a heavy metal plate (111) and a light metal plate (112) arranged below the heavy metal plate (111), so Several arc-shaped grooves (1121) are arranged at the bottom of the light metal plate (112), and the cooling liquid pipe (120) is arranged on the arc-shaped grooves (1121).
The swinging high-power X-ray conversion target device according to claim 4, characterized in that, the cooling liquid pipe (120) is arranged along a short side direction parallel to the conversion target (10).
The swing-type high-power X-ray conversion target device according to claim 4, characterized in that, the hinge structure between the connecting plate (223) and the conversion target (10) is on the side of the conversion target (10) A connecting hole (131) is opened on the fixing frame (130), and the connecting plate (223) is connected with the connecting hole (131) through a bolt (2231), and the connecting hole (131) is a waist-shaped hole. The longer axis of the connection hole (131) is perpendicular to the shorter side direction of the conversion target (10).
The oscillating high-power X-ray conversion target device according to claim 4, characterized in that the depth of the arc-shaped groove (1121) of the light metal plate (112) is 50% of the thickness of the metal composite plate (110) ~65%.
The oscillating high-power X-ray conversion target device according to claim 4, characterized in that the material of the heavy metal plate (111) in the metal composite plate (110) is one of tantalum, tungsten and gold.
The oscillating high-power X-ray conversion target device according to claim 4, characterized in that the material of the light metal plate (112) in the metal composite plate (110) is one of copper and aluminum.
The swinging high-power X-ray conversion target device according to claim 4, characterized in that, when the light metal plate (112) is a copper plate, the cooling liquid pipe (120) is a copper pipe, and the light metal plate (112 ) is an aluminum plate, the cooling liquid pipe (120) is an aluminum pipe.