A tray for electron accelerator irradiation

Abstract

This invention discloses a tray for electron accelerator irradiation, comprising: a tray body with an automatic centering mechanism mounted on its upper surface, and a thickened edge structure for the tray body; a horizontal track mechanism at the lower end of the tray body, and a lifting mechanism at the lower end of the horizontal track mechanism. The automatic centering mechanism of this invention enables automatic centering of the irradiated product, ensuring that the irradiated product is always at the position of maximum irradiation dose. Combined with the thickened structure, it improves the utilization efficiency of the electron beam from the electron accelerator and the irradiation effect on the product. The lifting mechanism of this invention adjusts the height of the tray body (i.e., the irradiated product), thereby increasing or decreasing the dose rate of the first irradiated product. The horizontal track mechanism increases the balance of the tray body and facilitates adjustment of its lateral and longitudinal positions. This invention places the dosimeter inside a metal housing, achieving electron balance and irradiation consistency.

Description

Technical Field

[0001] This invention belongs to the field of electron accelerator technology, and more specifically, this invention relates to a tray for electron accelerator irradiation. Background Technology

[0002] When electron accelerators irradiate food, medical devices, and other items, these items need to be placed on trays. Currently, many trays are simple plate-like structures. High-efficiency electron accelerators can achieve rapid, low-cost, and large-scale product irradiation by using the lowest-cost plate-like structure. However, this simple tray structure cannot be raised or lowered. Based on the scanning irradiation characteristics of electron accelerators, generally speaking, the closer the product is to the electron beam exit window (i.e., the higher the tray position), the greater the irradiation dose received. Therefore, due to the current lack of height-adjustable electron accelerator irradiation trays, it is impossible to adjust the height of products with different irradiation dose rates using a single tray. Meanwhile, the location with the highest and most uniform dose irradiation is concentrated at the position where the electron accelerator exit window is projected onto the tray. This position is usually in the middle of the tray. In the three-dimensional space above the tray, there is a phenomenon of decreasing marginal irradiation dose. The closer to the irradiation center, the greater the dose received by the product, while the dose received by the product gradually decreases near the edge of the irradiation tray. Therefore, in order to obtain the most uniform irradiation dose, achieve the most efficient irradiation of the product, and make full use of the irradiation electron beam energy of the electron accelerator, a tray that can automatically center the product is needed, and this tray structure can also adjust the irradiation height. Summary of the Invention

[0003] One object of the present invention is to solve at least the above-mentioned problems and / or defects, and to provide at least the advantages described below.

[0004] To achieve these objectives and other advantages according to the present invention, a tray for electron accelerator irradiation is provided, comprising:

[0005] The pallet body has an automatic centering mechanism installed on its upper surface, and the edges of the pallet body are designed with a thickened structure.

[0006] The lower end of the pallet body is provided with a horizontal rail mechanism, and the lower end of the horizontal rail mechanism is provided with a lifting mechanism.

[0007] Preferably, the upper surface of the tray body is provided with a metal housing structure, the metal housing structure is provided with a dosimeter placement hole for placing a dosimeter, and the dosimeter is placed inside the metal housing structure.

[0008] Preferably, the automatic alignment mechanism comprises two identical structures: a left-side automatic alignment mechanism and a right-side automatic alignment mechanism, and the structure of either the left-side or right-side automatic alignment mechanism includes:

[0009] Two pairs of mounting plates are clamped and fixed to the vertical edge of the tray body by locking bolts and locking nuts. The inner mounting plate is fixedly connected to a fixing cylinder. A sliding rod is slidably connected inside the fixing cylinder. A return spring is axially provided between the sliding rod and the fixing cylinder. An axial limiting protrusion is provided on the sliding rod. A limiting groove adapted to the limiting protrusion is provided on the inner wall of the fixing cylinder. The limiting protrusion is slidably disposed in the limiting groove.

[0010] The front end of the sliding rod is rotatably connected to an arc-shaped baffle. The centers of the two arc-shaped baffles are on the same straight line, and the centers of the two arc-shaped baffles are located in the center of the tray body.

[0011] Preferably, a U-shaped mounting piece is fixedly provided on the back of the arc-shaped baffle, and a mounting shaft is fixedly provided at the front end of the sliding rod. The U-shaped mounting piece is rotatably connected to both ends of the mounting shaft, and an irregularly shaped damping plate is also connected between the mounting shaft and the arc-shaped baffle. The large end of the irregularly shaped damping plate is fixedly sleeved on the mounting shaft, and the small end is fixedly connected to the back of the arc-shaped baffle.

[0012] Preferably, an angle adjustment mechanism is further provided between the arc-shaped baffle and the fixed cylinder, and the structure of the angle adjustment mechanism includes:

[0013] A collar is slidably sleeved on the outer surface of the fixed cylinder. A fixing plate is integrally formed on one side of the collar. An adjusting rod is threaded onto the fixing plate. The end of the adjusting rod is rotatably connected to an adjusting cylinder via a bearing. A U-shaped connector is horizontally movably connected to the adjusting cylinder. The U-shaped connector is fixed to the back of the arc-shaped baffle.

[0014] The angle adjustment mechanisms on the left and right automatic centering mechanisms are set on the same side or opposite sides.

[0015] Preferably, the thickening structure consists of multiple thickening gaskets, which are fixed to the lower or upper surface of the pallet body by bolts, and the thickening gaskets are arranged in a rectangular enclosure on the lower surface or the edge of the lower surface of the pallet body.

[0016] Preferably, the lifting mechanism comprises the following structure:

[0017] The base has four lifting cylinders fixedly installed on it. One of the lifting cylinders is equipped with a hand-cranked worm gear mechanism. Each lifting cylinder is equipped with a lifting rod. The worm of the hand-cranked worm gear mechanism is fixedly connected to one of the lifting rods. The other three lifting rods are threaded with positioning lock nuts. The lower surface of the positioning lock nuts abuts against the upper surface of the lifting cylinder.

[0018] A horizontal crossbar is fixedly connected between two adjacent lifting rods, and a base plate is fixedly installed at the upper end of the four lifting rods.

[0019] Preferably, the structure of the horizontal track mechanism includes:

[0020] Two transverse guide rails are fixedly mounted on the upper surface of the base plate;

[0021] Two sets of transverse sliders are slidably connected to the transverse guide rails respectively. The upper end of the transverse slider is fixedly connected to the longitudinal guide rail. The longitudinal slider is slidably connected to the longitudinal guide rail. The top plate is fixedly connected to the longitudinal slider. The top plate is connected to the pallet body through a limiting component. The limiting component includes multiple limiting posts, which are fixedly set on the lower surface of the pallet body. The top plate has limiting holes with the same number of limiting posts, and the limiting posts pass through the limiting holes.

[0022] Preferably, a connecting column is provided between the mounting plate and the fixed cylinder, the connecting column and the fixed cylinder are rotatably connected, an L-shaped positioning rod is fixedly provided on the outside of the fixed cylinder, the L-shaped positioning rod is provided with a pin hole, and the tray body is provided with a positioning hole corresponding to the pin hole;

[0023] A telescopic plate is connected between two arc-shaped baffles. The telescopic plate includes an outer plate, which is fixedly connected to one of the arc-shaped baffles; and an inner plate, one end of which is fixedly connected to the other arc-shaped baffle, and the other end of which is slidably disposed inside the outer plate.

[0024] Preferably, four support columns are fixedly installed on the top plate, and a support spring is sleeved on each support column, with the lower surface of the tray body abutting against the support spring.

[0025] An installation column is provided on the outside of the support column, and a fixed pulley is installed at the upper end of the installation column. Traction ropes are connected to the four corners of the pallet body. The traction ropes pass around the fixed pulleys and are respectively connected to the counterweight frames on both sides of the top plate for placing counterweight bars.

[0026] The present invention offers at least the following advantages: The automatic centering mechanism ensures automatic centering of the irradiated product, guaranteeing it is always positioned at the maximum irradiation dose. Combined with the thickened structure, this improves the utilization efficiency of the electron beam from the electron accelerator and enhances the product's irradiation effect. The lifting mechanism allows for adjusting the height of the tray body (i.e., the irradiated product), thereby increasing or decreasing the dose rate of the first irradiated product. The horizontal track mechanism enhances the tray body's balance and facilitates adjustment of its lateral and longitudinal positions. Placing the dosimeter inside the metal housing achieves electron balance and irradiation consistency.

[0027] Other advantages, objectives and features of the present invention will become apparent in part from the following description, and in part from those skilled in the art through study and practice of the invention. Attached Figure Description

[0028] Figure 1 A schematic diagram of the front structure of the tray for electron accelerator irradiation provided by the present invention;

[0029] Figure 2 This is a top view of the tray body provided by the present invention.

[0030] Figure 3 This is a schematic diagram of the automatic centering mechanism;

[0031] Figure 4 A schematic diagram of the connection structure for mounting the shaft, U-shaped mounting piece, and arc-shaped baffle;

[0032] Figure 5 A schematic diagram of an automatic centering mechanism with a connecting column and an L-shaped positioning rod;

[0033] Figure 6 This is a schematic diagram of the automatic centering mechanism with connecting column and L-shaped positioning rod when positioning the product to be irradiated at a 60-degree tilt.

[0034] Figure 7 This is a schematic diagram of the metal casing structure;

[0035] Figure 8 A schematic diagram of the dose distribution obtained by irradiation using the electron accelerator irradiation tray provided by the present invention;

[0036] Figure 9 A schematic diagram of the transverse dose distribution obtained by irradiation using the electron accelerator irradiation tray provided by the present invention;

[0037] Figure 10 A schematic diagram of the longitudinal surface dose distribution obtained by irradiation using the electron accelerator irradiation tray provided by the present invention;

[0038] Figure 11 A schematic diagram of a typical tray structure used for electron accelerator irradiation.

[0039] Figure 12 A schematic diagram of the dose distribution obtained by irradiating a tray used for ordinary electron accelerator irradiation.

[0040] Figure 13 A schematic diagram of the transverse dose distribution obtained by irradiating a tray used for ordinary electron accelerator irradiation.

[0041] Figure 14 A schematic diagram of the longitudinal surface dose distribution obtained by irradiating a tray used for ordinary electron accelerator irradiation.

[0042] Figure 15 This is a schematic diagram showing the change in area dose curve obtained using the electron accelerator irradiation tray provided by the present invention. Detailed Implementation

[0043] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0044] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0045] It should be noted that in the description of this invention, the orientations or positional relationships indicated by terms are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this invention. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0046] In the description of this invention, unless otherwise explicitly specified and limited, the terms "installed", "equipped", "sleeved / connected", "connected", etc., should be interpreted broadly. For example, "connection" 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 an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0047] Furthermore, in this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Moreover, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0048] like Figure 1-7 As shown: A tray for electron accelerator irradiation according to the present invention includes:

[0049] The pallet body 1 has an automatic centering mechanism 2 installed on its upper surface, and the edges of the pallet body 1 are designed with a thickened structure.

[0050] The lower end of the pallet body 1 is provided with a horizontal rail mechanism 3, and the lower end of the horizontal rail mechanism 3 is provided with a lifting mechanism 4.

[0051] Working Principle: The automatic centering mechanism 2 in the electron accelerator irradiation tray structure provided by this invention allows the irradiated product to be placed in the automatic centering mechanism, achieving automatic centering of the irradiated product and automatically aligning it with the area below the electron accelerator where the electron beam irradiation dose is the highest. This ensures that the irradiated product is always at the position of maximum irradiation dose. Combined with the thickened structure, this reduces the marginal effect of the electron accelerator scanning area on the tray body 1, improving the utilization efficiency of the electron beam and the irradiation effect on the product. The invention also utilizes a lifting mechanism 4 to adjust the height of the tray body (i.e., the irradiated product), thereby increasing or decreasing the dose rate of the first irradiated product. When the lifting mechanism 4 raises the tray body 1, the irradiation dose received by the irradiated product placed on the tray body 1 increases; conversely, when the lifting mechanism 4 lowers the tray body 1, the irradiation dose received by the irradiated product placed on the tray body 1 decreases. This allows for the satisfaction of different irradiation requirements for different irradiated products. The present invention improves the balance of the tray body 1 by setting up a horizontal track mechanism 3, and facilitates the adjustment of the lateral and longitudinal positions of the tray body 1. When the irradiated product has been automatically centered, the horizontal track mechanism 3 can quickly and accurately transport the irradiated product to the area with the largest irradiation dose.

[0052] In the above technical solution, a metal housing structure 5 is provided on the edge of the upper surface of the tray body 1. The metal housing structure 5 has a dosimeter placement hole 51 for placing a dosimeter, and the dosimeter is placed inside the metal housing structure 5. This invention places the dosimeter inside the metal housing 5. The metal housing 5 and its internal filling material provide shielding for the dosimeter. The dosimeter measures the dose rate through the dosimeter placement hole 51, achieving electronic balance and irradiation consistency. The diameter of the dosimeter placement hole is 2 cm, and the dosimeter placement depth is 5 mm.

[0053] In the above technical solution, the automatic alignment mechanism 2 includes two identical structures: a left automatic alignment mechanism and a right automatic alignment mechanism. The structure of either the left or right automatic alignment mechanism includes:

[0054] Two pairs of mounting plates 201 are clamped and fixed to the vertical edge 101 of the tray body 1 by locking bolts and locking nuts. The mounting plates 201 on the inner side are fixedly connected to a fixing cylinder 202. A sliding rod 203 is slidably connected inside the fixing cylinder 202. A return spring 204 is axially arranged between the sliding rod 203 and the fixing cylinder 202. An axial limiting protrusion (not shown) is provided on the sliding rod 203. A limiting groove (not shown) is provided on the inner wall of the fixing cylinder 202 to match the limiting protrusion. The limiting protrusion is slidably arranged in the limiting groove.

[0055] The front end of the sliding rod 203 is rotatably connected to an arc-shaped baffle 205. The centers of the two arc-shaped baffles 205 are on the same straight line, and the centers of the two arc-shaped baffles 205 are located at the center of the tray body 1.

[0056] In this technical solution, the length of the return spring 204 is selected according to the size of the irradiated product. After installing the two automatic centering mechanisms 2, the irradiated product is placed between the two arc-shaped baffles 205. The two arc-shaped baffles 205 automatically center the irradiated product, that is, the irradiated sample is clamped and limited by the two arc-shaped baffles 205 to the center of the tray body 1, so that the irradiated product can receive a larger and more uniform dose of irradiation, making fuller use of the energy of the electron beam of the electron accelerator. The setting of the return spring 204 provides soft and elastic support for the arc-shaped baffles 205, which is convenient for limiting the size range of irradiated products. At the same time, after the irradiated product is removed, the two arc-shaped baffles 205 can immediately return to their initial position. The limiting groove and the limiting protrusion cooperate to axially limit the sliding rod 203, preventing the sliding rod 203 from shifting laterally within the fixed cylinder 202, thereby improving the accuracy and stability of automatic centering. Meanwhile, the two pairs of mounting plates 201 and the vertical edge 101 are detachably fixed with locking nuts and locking bolts, which facilitates the quick disassembly and installation of the automatic centering mechanism.

[0057] In the above technical solution, a U-shaped mounting component 206 is fixedly disposed on the back of the arc-shaped baffle 205, and a mounting shaft 207 is fixedly disposed on the front end of the sliding rod 203. The U-shaped mounting component 206 is rotatably connected to both ends of the mounting shaft 207, and a shaped damping plate 208 is also connected between the mounting shaft 207 and the arc-shaped baffle 205. The large end of the shaped damping plate 208 is fixedly sleeved on the mounting shaft, and the small end is fixedly connected to the back of the arc-shaped baffle 205. This structural arrangement realizes the rotatable connection between the arc-shaped baffle 205 and the sliding rod 203. The shaped damping plate 208 disposed between the mounting shaft 207 and the arc-shaped baffle 205 provides a certain damping force for the rotation of the arc-shaped baffle 205, so that the arc-shaped baffle 205 has a certain elasticity and toughness when the limiting angle of the irradiated product changes, thus making the limiting and clamping of the irradiated product more stable.

[0058] In the above technical solution, an angle adjustment mechanism is further provided between the arc-shaped baffle 205 and the fixed cylinder 202, and the structure of the angle adjustment mechanism includes:

[0059] A collar 209 is slidably sleeved on the outer surface of the fixed cylinder 202. A fixing plate 2010 is integrally formed on one side of the collar 209. An adjusting rod 2011 is threadedly connected to the fixing plate 2010. The end of the adjusting rod 2011 is rotatably connected to an adjusting cylinder 2012 through a bearing. A U-shaped connector 2013 is horizontally movably connected to the adjusting cylinder 2012. The U-shaped connector 2013 is fixed to the back of the arc-shaped baffle 205.

[0060] The angle adjustment mechanisms on the left and right automatic centering mechanisms can be set on the same side or opposite sides. Figure 2 The diagram shows the opposite-side configuration. The angle adjustment mechanism is designed to adjust to a more suitable limiting clamping angle for irradiated products of different shapes and sizes (typically, these irradiated products are asymmetrical or not conventionally cylindrical). The limiting clamping angle is adjusted by turning the adjusting rod 2011, which moves forward or backward along the sliding rod 202. Since the adjusting cylinder 2012 and the adjusting rod 2011 are rotatably connected, the adjusting rod 2011 only applies a forward pushing or backward pulling force to the arc-shaped baffle 205, thereby changing the clamping limiting angle of the arc-shaped baffle 205. The U-shaped connector 2013 allows the adjusting rod 2011 to have a smoother and less obstructive angle adjustment function. When the sliding rod 203 compresses the return spring 204 in the fixed cylinder or is pushed back by the return spring 204, the collar 209 slides axially along the surface of the fixed cylinder 202.

[0061] In the above technical solution, the thickened structure consists of multiple thickened gaskets 9, which are fixed to the lower or upper surface of the tray body 1 by bolts. The thickened gaskets 9 are arranged in a rectangular enclosure around the lower surface or edge of the tray body 1. By using the thickened gaskets 9, the interaction between the thickened gaskets 9 and the electron beam is enhanced. With the electron beam energy and free path remaining constant, the amount of electron beam reflected back from the edge of the tray body 1 is increased, thereby reducing the marginal effect of the dose rate in the three-dimensional space above the tray body 1. This allows the edge of the tray body 1 to also meet the irradiation dose rate requirements for the irradiated sample, and also makes the dose rate distribution at the center of the tray body 1 more uniform and concentrated. This allows the irradiated sample to receive dose rate irradiation over a larger area, making fuller use of the electron beam energy of the electron accelerator.

[0062] In the above technical solution, the structure of the lifting mechanism includes:

[0063] The base 401 has four lifting cylinders 402 fixedly installed on it. One of the lifting cylinders 402 is equipped with a hand-cranked worm gear mechanism 403. Each lifting cylinder 402 is equipped with a lifting rod 404. The worm of the hand-cranked worm gear mechanism 403 is fixedly connected to one of the lifting rods 404. The other three lifting rods 404 are threaded with positioning lock nuts 405. The lower surface of the positioning lock nuts 405 abuts against the upper surface of the lifting cylinder 402.

[0064] A horizontal crossbar 406 is fixedly connected between two adjacent lifting rods 404, and a base plate 407 is fixedly installed on the upper end of the four lifting rods 404. The pallet body 1 is raised or lowered by manually rotating the hand-cranked worm gear mechanism 403, thereby adjusting the product to be irradiated to the target height. When the product reaches the target height, tightening the positioning locking nut 405 prevents the other three lifting rods from descending, thus achieving the purpose of positioning the height of the pallet body 1. The horizontal crossbar 406 allows the four lifting rods 404 to rise or fall synchronously, ensuring that the upper surface of the pallet body 1 remains horizontal throughout the entire rising or falling process.

[0065] In the above technical solution, the structure of the horizontal track mechanism includes:

[0066] Two transverse guide rails 301 are fixedly mounted on the upper surface of the base plate 407;

[0067] Two sets of transverse sliders 302 are slidably connected to the transverse guide rails 301. A longitudinal guide rail 303 is fixedly connected to the upper end of each transverse slider 302. A longitudinal slider 304 is slidably connected to the longitudinal guide rail 303. A top plate 305 is fixedly connected to the longitudinal slider 304. The top plate 305 is connected to the pallet body 1 via a limiting component. The limiting component includes two limiting posts, which are fixedly disposed on the lower surface of the pallet body 1. The top plate 305 has limiting holes, the same number as the limiting posts, through which the limiting posts pass. By manually pushing the longitudinal guide rails 303 and the top plate 305, the transverse and longitudinal positions of the pallet body 1 can be adjusted respectively, while ensuring the stability of the pallet body 1's movement.

[0068] In the above technical solution, a connecting column 2015 is provided between the mounting plate 201 and the fixed cylinder 202. The connecting column 2015 and the fixed cylinder 202 are rotatably connected. An L-shaped positioning rod 2014 is fixedly provided on the outside of the fixed cylinder 202. A pin hole 2016 is provided on the L-shaped positioning rod 2015. A positioning hole corresponding to the pin hole 2016 is provided on the tray body 1.

[0069] A telescopic plate connects the two arc-shaped baffles 205. The telescopic plate includes an outer plate 2017, which is fixedly connected to one of the arc-shaped baffles 205; and an inner plate 2018, one end of which is fixedly connected to the other arc-shaped baffle 105, and the other end of which is slidably disposed inside the outer plate 1017. With this design, after the sample to be irradiated is placed on the telescopic plate, the L-shaped positioning rod 2014 is held to rotate the fixed cylinder 60 degrees. Then, the pin is inserted into the pin hole 2016 and the positioning hole, so that the upper opening of the sample box is at a 60-degree angle to the horizontal plane, thereby achieving angular positioning of the sample to be irradiated. This setting facilitates the loading of samples into the relevant sample boxes.

[0070] In the above technical solution, four support columns 6 are fixedly installed on the top plate 305, and a support spring 7 is sleeved on each support column 6. The lower surface of the tray body 1 abuts against the support spring 7.

[0071] A mounting column 8 is provided on the outer side of the support column 6. A fixed pulley 9 is installed at the upper end of the mounting column 8. Traction ropes 10 are connected to the four corners of the tray body 1. The traction ropes 10 pass around the fixed pulleys 9 and are respectively connected to the counterweight frames 11 on both sides of the top plate 305 for placing counterweight bars. With this structure, counterweight bars of corresponding weight are placed in the counterweight frames according to the weight of the product to be irradiated, in order to control the descent height of the tray body 1. Each counterweight bar weighs 0.5 kg. The weight of the counterweight bar and the weight of the sample to be irradiated are related as follows: Where M is the total weight of the counterweight bar and counterweight frame, m1 is the weight of the sample to be irradiated, m2 = 1, 2, 5, 10, 20 kg are selectable weight constants and m2 < m3, and m3 is the weight of the pallet body 1. The effect achieved is that, with the supporting spring 7 providing soft support to the pallet body 1, when an irradiated product of appropriate weight is placed on the pallet body, the pallet and the sample to be irradiated will descend to an appropriate height. However, due to the structural arrangement of the traction rope, fixed pulley, and counterweight frame, the heavier the irradiated product, the heavier the counterweight bar will be placed in the counterweight frame, resulting in a smaller descent height (or a larger ascent height) for the pallet body; conversely, the lighter the irradiated product, the fewer the counterweight bars are placed in the counterweight frame, resulting in a larger descent height for the pallet body 1. Therefore, regardless of the weight of the sample to be irradiated, the overall height of the pallet body and the sample to be irradiated can be ensured to be within 60 cm.

[0072] Before loading the product to be irradiated onto the pallet body, height sensors are installed on the top plate and the pallet body to accurately adjust the height of the pallet body. Simultaneously, distance sensors are installed at the opposite positions of the two arc-shaped baffles. The height and distance sensors measure the height of the pallet body, the height of the top plate, and the distance between the two arc-shaped baffles, respectively. The height and distance sensors are connected to an alarm via a controller to provide alarm prompts when the target height is raised or lowered. When the height of the pallet body and the top plate reaches the set value, the controller issues an alarm command, and the alarm sounds for the height of the pallet body after loading the product to be irradiated, as well as a prompt indicating whether the two arc-shaped baffles are clamping the product (indicating whether the distance between the two arc-shaped baffles is equal to the size of the product to be irradiated, used to determine if the product is being clamped by the arc-shaped baffles). Once the top plate and the pallet body have reached the target height and the distance between the two arc-shaped baffles meets the requirements, the height and distance sensors are removed.

[0073] Figure 11 This is a schematic diagram of a typical electron accelerator irradiation tray structure, which only includes a flat plate and a vertical edge, lacking an automatic centering mechanism, thickened pads, a lifting mechanism, and a horizontal track mechanism. The electron accelerator irradiation tray and the one provided by this invention are used respectively. Figure 11 The ordinary trays shown were irradiated without load. All irradiations used identical electron accelerators with the same electron beam energy and scanning width, and the tray height was the same. After the same irradiation time, the following results were obtained: Figures 8-10 and Figures 12-14As can be seen from the comparison of the six figures, the dose distribution in the three-dimensional diagram of the electron accelerator irradiation tray provided by this invention is mainly concentrated at the irradiation center, with the low-limit dose region located at the bottom four corners and the high-limit region located at the inner center. Furthermore, the dose distribution at the inner center is more uniform, and the area with the highest dose rate occupies a larger area. The marginal effect of the tray is significantly reduced, making it more conducive to irradiating the product. In contrast, the irradiation results of ordinary trays are shown in the figure. Figures 12-14 The dose distribution in the area above it is significantly worse than that of the electron accelerator irradiation tray provided in this invention. Furthermore, analyzing the surface dose distribution along the length of the tray body yields... Figure 15 With the bottom left corner of the tray body as the origin of the horizontal axis, the horizontal axis represents the horizontal distance from the bottom left corner. Figure 15 The peak values ​​of the curves are concentrated in the range of 100mm to 800mm, which fully conforms to the central irradiation law for irradiated products and meets the requirements for efficient irradiation of irradiated products. Figures 8-10 and Figures 12-14 The shades of color in the bar chart represent the amount of radiation dose; the darker the color, the greater the radiation dose.

[0074] The number of devices and processing scale described herein are for the purpose of simplifying the description of the invention. Applications, modifications, and variations of the invention will be readily apparent to those skilled in the art.

[0075] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A tray for electron accelerator irradiation, characterized in that, include: The pallet body has an automatic centering mechanism installed on its upper surface, and the edges of the pallet body are designed with a thickened structure. The lower end of the pallet body is provided with a horizontal rail mechanism, and the lower end of the horizontal rail mechanism is provided with a lifting mechanism. The automatic alignment mechanism comprises two identical structures: a left automatic alignment mechanism and a right automatic alignment mechanism. The structure of either the left or right automatic alignment mechanism includes: Two pairs of mounting plates are clamped and fixed to the vertical edge of the tray body by locking bolts and locking nuts. The inner mounting plate is fixedly connected to a fixing cylinder. A sliding rod is slidably connected inside the fixing cylinder. A return spring is axially provided between the sliding rod and the fixing cylinder. An axial limiting protrusion is provided on the sliding rod. A limiting groove adapted to the limiting protrusion is provided on the inner wall of the fixing cylinder. The limiting protrusion is slidably disposed in the limiting groove. The front end of the sliding rod is rotatably connected to an arc-shaped baffle. The centers of the two arc-shaped baffles are on the same straight line, and the centers of the two arc-shaped baffles are located at the center of the tray body. A U-shaped mounting piece is fixedly provided on the back of the arc-shaped baffle, and a mounting shaft is fixedly provided at the front end of the sliding rod. The U-shaped mounting piece is rotatably connected to both ends of the mounting shaft, and an irregularly shaped damping plate is also connected between the mounting shaft and the arc-shaped baffle. The large end of the irregularly shaped damping plate is fixedly sleeved on the mounting shaft, and the small end is fixedly connected to the back of the arc-shaped baffle. An angle adjustment mechanism is also provided between the arc-shaped baffle and the fixed cylinder, and the structure of the angle adjustment mechanism includes: A collar is slidably sleeved on the outer surface of the fixed cylinder. A fixing plate is integrally formed on one side of the collar. An adjusting rod is threaded onto the fixing plate. The end of the adjusting rod is rotatably connected to an adjusting cylinder via a bearing. A U-shaped connector is horizontally movably connected to the adjusting cylinder. The U-shaped connector is fixed to the back of the arc-shaped baffle. The angle adjustment mechanisms on the left and right automatic centering mechanisms are set on the same side or opposite sides; The thickened structure consists of multiple thickened gaskets, which are fixed to the lower or upper surface of the pallet body by bolts, and the thickened gaskets are arranged in a rectangular enclosure on the lower surface or the edge of the lower surface of the pallet body. The lifting mechanism includes the following structure: The base has four lifting cylinders fixedly installed on it. One of the lifting cylinders is equipped with a hand-cranked worm gear mechanism. Each lifting cylinder is equipped with a lifting rod. The worm of the hand-cranked worm gear mechanism is fixedly connected to one of the lifting rods. The other three lifting rods are threaded with positioning lock nuts. The lower surface of the positioning lock nuts abuts against the upper surface of the lifting cylinder. A horizontal crossbar is fixedly connected between two adjacent lifting rods, and a base plate is fixedly installed at the upper end of the four lifting rods; The structure of the horizontal track mechanism includes: Two transverse guide rails are fixedly mounted on the upper surface of the base plate; Two sets of transverse sliders are slidably connected to the transverse guide rails respectively. The upper end of the transverse slider is fixedly connected to the longitudinal guide rail. The longitudinal slider is slidably connected to the longitudinal guide rail. The top plate is fixedly connected to the longitudinal slider. The top plate is connected to the pallet body through a limiting component. The limiting component includes multiple limiting posts, which are fixedly set on the lower surface of the pallet body. The top plate has limiting holes with the same number of limiting posts, and the limiting posts pass through the limiting holes. Four support columns are fixedly installed on the top plate, and a support spring is sleeved on each support column. The lower surface of the tray body abuts against the support spring. A mounting column is provided on the outer side of the support column, and a fixed pulley is installed at the upper end of the mounting column. Traction ropes are connected to the four corners of the tray body. The traction ropes pass around the fixed pulleys and are respectively connected to the counterweight frames on both sides of the top plate for placing counterweight bars. According to the weight of the product to be irradiated, counterweight bars of corresponding weight are placed in the counterweight frames to control the descent height of the tray body. Each counterweight bar weighs 0.5 kg. The weight of the counterweight bar and the weight of the sample to be irradiated are related as follows: ,in M It is the total weight of the counterweight bar and the counterweight frame. m 1 represents the weight of the sample to be irradiated. m 2 = 1, 2, 5, 10, 20 kg are selectable weight constants and m 2< m 3, m 3 represents the weight of the pallet body (1); A connecting column is provided between the mounting plate and the fixed cylinder. The connecting column and the fixed cylinder are rotatably connected. An L-shaped positioning rod is fixedly provided on the outside of the fixed cylinder. A pin hole is provided on the L-shaped positioning rod. A positioning hole corresponding to the pin hole is provided on the tray body. A telescopic plate is connected between two arc-shaped baffles. The telescopic plate includes an outer plate, which is fixedly connected to one of the arc-shaped baffles; and an inner plate, one end of which is fixedly connected to the other arc-shaped baffle, and the other end of which is slidably disposed inside the outer plate.

2. The tray for electron accelerator irradiation as described in claim 1, characterized in that, The upper surface of the tray body is provided with a metal shell structure, and the metal shell structure is provided with a dosimeter placement hole for placing a dosimeter, and the dosimeter is placed inside the metal shell structure.

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