CN114545487A

CN114545487A - Rotary target device

Info

Publication number: CN114545487A
Application number: CN202210043470.0A
Authority: CN
Inventors: 刘蕴韬; 李晓博; 李玮; 焦听雨; 秦茜; 肖凯歌; 李世垚
Original assignee: China Institute of Atomic of Energy
Current assignee: China Institute of Atomic of Energy
Priority date: 2022-01-14
Filing date: 2022-01-14
Publication date: 2022-05-27
Anticipated expiration: 2042-01-14
Also published as: CN114545487B

Abstract

The application discloses rotary target device for monoenergetic neutron reference radiation field, including target plate and target main part. The target is used for being bombarded by proton beams from the accelerator to generate monoenergetic neutrons; the target sheet is arranged on the target body, and the target body is configured to enable the target sheet to rotate so as to change the bombardment position of the proton beam current on the target sheet. The device of the application can change the bombardment position of proton beam current at the target plate, reduces the local deposition energy of the target plate, and prevents the target plate from being destroyed by melting due to overhigh temperature.

Description

Rotary target device

Technical Field

The application relates to the field of reference radiation field devices, in particular to a rotary target device.

Background

The current single-energy fast neutrons have wide and deep application in the fields of nuclear data measurement, reactor design, irradiation experiment, radiotherapy and the like, wherein the accuracy of neutron detectors and dosage instruments used in the method determines that the work can be smoothly carried out to a great extent. The measurement and the accurate calibration of the response functions of the neutron detector and the dosimeter are completed under a reference radiation field with accurately known neutron fluence and neutron energy spectrum, so that the method has very important significance for the related research of the neutron reference radiation field.

The keV energy zone is one of important energy zones for construction of a single-energy fast neutron reference radiation field recommended by the international standard ISO 8529 neutron reference radiation. Because most materials are in a resonance area in an energy area of several keV-100 keV and the cross section changes greatly, the neutron capture cross section of the keV energy area is an important parameter of nuclear reaction theory, neutron fluence measurement, element synthesis and nuclear reactor design, and researches in the nuclear celestial body physical field and fast neutron breeder reactor are particularly concerned about the neutron capture cross section of the energy area of 10-300 keV. Especially in the aspects of selection direction of structural materials and cladding materials of the fusion reactor, neutron radiation protection and use of a radiation protection dose instrument.

Although it is used for⁴⁵The Sc (p, n) reaction has many advantages in generating keV monoenergetic neutron reference radiation fields: if the emitted neutrons are isotropic in a mass center system, the associated gamma background is small, the yield of monoenergetic neutrons is higher than other alternative reactions, but the resonance width of a series of resonance areas in an keV energy area is small, the monoenergetic neutrons with good monochromaticity can be generated only by using a thin target plate, and the yield of neutrons is still lower. Therefore, if the counting rate of the detector is further increased, the measurement period is shortened to reduce the statistical error and reduce the influence of the natural background, the intensity of the proton beam current can only be increased. Therefore, under the conditions that the proton beam fixedly bombards one point and the beam spot area on the target sheet is not changed, the beam power density deposited on the target sheet is increased along with the fixed bombardment, and the target sheet has the risks of local overheating melting, breakage and damage.

Disclosure of Invention

In view of the above, it is desirable to provide a rotary target device to solve the problem of overheating of the target sheet.

In order to achieve the above purpose, the technical solution of the embodiment of the present application is implemented as follows:

the embodiment of the application discloses rotary target device for monoenergetic neutron reference radiation field includes:

the target is used for receiving bombardment of proton beams from the accelerator so as to generate monoenergetic neutrons;

a target body on which the target sheet is disposed, the target body configured to enable rotation of the target sheet to change a bombardment position of the proton beam current on the target sheet.

Further, the target body includes:

a mounting seat;

the driving assembly is arranged on the mounting seat;

the target frame is connected with the driving assembly at one end;

the target piece is positioned in the neutron target tube, and the neutron target tube is arranged at one end of the target frame, which is far away from the driving assembly;

the driving component drives the target frame to do eccentric motion so as to enable the target piece to do circular motion around the center of the proton beam.

Further, the drive assembly includes:

the power source is arranged on the mounting seat and used for providing driving force;

and the deflection mechanism is arranged on the mounting seat, is connected with the power source and the target frame and is used for driving the target frame to rotate eccentrically.

Further, the deflection mechanism includes:

the driving wheel assembly is arranged on the mounting seat and is in driving connection with the power source;

the driven wheel assembly is arranged on the mounting base, and one end of the target frame is connected with the driving wheel assembly and the driven wheel assembly respectively;

and the synchronous belt is connected with the driving wheel component and the driven wheel component so that the driving wheel component drives the driven wheel component to move synchronously.

Further, the deflection mechanism further comprises:

and the tensioning device is arranged on the mounting seat and used for tensioning the synchronous belt so as to enable the driven wheel assembly and the driving wheel assembly to synchronously move.

Further, the tensioner comprises:

the tensioning support is fixed on the mounting seat;

one end of the tensioning wheel is adjustably arranged on the tensioning support, and the circumferential surface of the other end of the tensioning wheel can be rotationally abutted against the synchronous belt;

and the abutting part is positioned in the tensioning support, one end of the abutting part is vertically connected to the mounting seat, and the other end of the abutting part abuts against the tensioning wheel and is used for supporting the tensioning wheel.

Further, the neutron target tube comprises:

one end of the vacuum target tube is fixed on the target frame, and the target sheet is positioned in the other end of the vacuum target tube;

one end of the corrugated pipe is connected with one end of the vacuum target pipe fixed on the target frame;

the end, far away from the vacuum target tube, of the corrugated tube is connected with the fixed tube, and the fixed tube is used for aligning the accelerator, so that the proton beam emitted by the accelerator bombards the target sheet after flowing through the fixed tube, the corrugated tube and the vacuum target tube;

the driving component drives the target frame to do eccentric motion, so that the vacuum target tube drives the target sheet to do circular motion around the center of the proton beam.

Further, the neutron target tube comprises a pressing ring nut, threads are arranged at the other end of the vacuum target tube, and the pressing ring nut is screwed with the target sheet through the threads to be fixed on the vacuum target tube.

Further, the rotary target apparatus includes:

the target support is configured to enable the setting position of the target main body to be adjustable so that the proton beam can bombard on the target piece.

Further, the rotary target apparatus further includes:

and one end of the alignment plate is detachably arranged on the target main body, the other end of the alignment plate is provided with a hole groove used for aligning with the accelerator, and the target support is adjusted to position the arrangement position of the target main body.

Further, the target holder includes:

a bracket upright post;

the three-dimensional sliding table is connected with the target main body and used for adjusting the setting position of the target main body;

the sliding table mounting plate is arranged on the support stand column, the three-dimensional sliding table is arranged on the sliding table mounting plate, and the sliding table mounting plate is used for adjusting the position of the three-dimensional sliding table relative to the support stand column.

Further, the rotary target apparatus further includes:

a cooling air duct for blowing cool air to the back of the target to reduce the temperature of the target.

The embodiment of the application discloses a rotating target device for monoenergetic neutron reference radiation field makes the target piece rotatory through setting up the target main part, changes proton beam and bombards the position on the target piece, can greatly reduce the local deposition energy of target piece, reduces the target piece because of the too high condition of melting out rupture of temperature.

Drawings

Fig. 1 is a schematic structural diagram of a rotary target apparatus according to an embodiment of the present disclosure;

FIG. 2 is a schematic structural view of the target body of FIG. 1;

FIG. 3 is a schematic view of the working principle of the target;

FIG. 4 is a schematic structural view of the drive wheel assembly of FIG. 2;

FIG. 5 is a schematic structural view of a driving wheel assembly driving a driven wheel assembly to rotate via a synchronous belt;

FIG. 6 is a schematic view of the tensioner of FIG. 2;

FIG. 7 is a schematic structural diagram of the three-dimensional slide table shown in FIG. 1;

FIG. 8 is a schematic top view of the three-dimensional sliding table from another perspective;

FIG. 9 is a schematic cross-sectional view of a three-dimensional slide table in a longitudinal direction;

FIG. 10 is a schematic structural diagram of the neutron target tube installed after the alignment plate is aligned with the accelerator through the empty slot.

Description of the reference numerals

A rotary target device 100; a target 101; a target body 1; a mounting base 11; a first platform 111; a second platform 112; a drive assembly 12; a power source 121; a stepping motor 1211; a motor mount 1212; a deflection mechanism 122; a drive wheel assembly 1221; a bearing assembly 12211; a power wheel 12212; a connecting shaft 12212 a; a rotary disk 12212 b; a transmission gear 12212 c; a drive shaft 12213; a connecting block 12213 a; a fixed shaft 12213 b; a driven wheel assembly 1222; a synchronous belt 1223; a tensioning device 1224; a tension mount 12241; a tension pulley 12242; an abutment 12243; a shaft coupling 123; a target frame 13; a through hole 13 a; a neutron target tube 14; a vacuum target tube 141; a bellows 142; a fixing tube 143; a compression ring nut 144; a vacuum caliper 145; a target holder 2; a bracket post 21; a three-dimensional slide table 22; a first component 221; a first plate 2211; a second plate 2212; a first fixing block 2213; a first set screw 2214; a second component 222; a third panel 2221; a fourth plate 2222; a second fixed block 2223; a second set screw 2224; a third component 223; a fifth plate 2231; a sixth plate 2232; a third fixing block 2233; an abutment end 22331; pushing end 22332; a third set screw 2234; a retaining member 224; a slide table mounting plate 23; the plate 3 is aligned.

Detailed Description

It should be noted that, in the present application, technical features in examples and embodiments may be combined with each other without conflict, and the detailed description in the specific embodiment should be understood as an explanation of the gist of the present application and should not be construed as an improper limitation to the present application.

The present application will be described in further detail with reference to the following drawings and specific embodiments. The descriptions of "first," "second," etc. in the embodiments of the present application are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly including at least one feature. In the description of the embodiments of the present application, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the description of the embodiments of the present application, the terms of orientation or positional relationship such as "lateral," "longitudinal," "vertical," and the like are based on the orientation or positional relationship shown in fig. 7-9, it being understood that these terms of orientation are merely used to facilitate the description of the present application and to simplify the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be considered as limiting the present application.

⁴⁵The Sc (p, n) reaction has many advantages in generating keV monoenergetic neutron reference radiation fields: if the emitted neutrons are isotropic in a mass center system, the associated gamma background is small, the yield of monoenergetic neutrons is higher than other alternative reactions, but the resonance widths of a series of resonance areas in an keV energy area are small, and the monoenergetic neutrons with better monochromaticity can be generated only by using a thin target plate, but the yield of neutrons is still lower. Therefore, if the counting rate of the detector is further increased, the measurement period is shortened to reduce the statistical error and reduce the influence of the natural background, the intensity of the proton beam current can only be increased. Therefore, under the conditions that the proton beam fixedly bombards one point and the beam spot area on the target sheet is not changed, the beam power density deposited on the target sheet is increased along with the fixed bombardment, and the target sheet has the risks of local overheating melting, breakage and damage.

In view of this, the present application provides a rotary target device for a monoenergetic neutron reference radiation field, please refer to fig. 1, which includes a target sheet 101 and a target body 1. The target 101 is used to receive bombardment by a proton beam from an accelerator to produce monoenergetic neutrons. For example, the target sheet 101 may be composed of a target material or a target material plus a substrate, and the addition of the substrate may be determined by the thickness of the target material and the properties of the target material. The target plate 101 is disposed on the target body 1, and the target body 1 is configured to be able to rotate the target plate 101 to change a bombardment position of the proton beam on the target plate 101.

In the embodiment, the target sheet 101 is rotated by the target body 1, and the bombardment position of the proton beam on the target sheet 101 is changed, so that the local deposition energy of the target sheet 101 can be greatly reduced, and the situation that the target sheet 101 is damaged and cracked due to over-high temperature is reduced.

In an embodiment, the target body 1 may comprise a drive assembly and a target head assembly. The driving assembly is fixedly arranged and used for providing driving force for the rotation of the target plate 101. The target assembly is connected with the driving assembly, the target sheet 101 is located on the target assembly, and the driving assembly drives the target assembly to rotate the target sheet 101 so as to change the bombardment position of the proton beam on the target sheet 101.

The embodiment adopts the drive assembly to provide the drive power, makes the target sheet 101 that is located the target head assembly rotatory, effectively reduces the local deposition energy of target sheet 101, reduces the condition that target sheet 101 melts down, simple structure, simple operation.

In the above embodiment, the target body 1 may be arranged so that the target 101 can rotate, and the target 101 may rotate on its own axis, and the rotation center of the target 101 and the center of the proton beam current may be arranged eccentrically. The target body 1 may be arranged so that the target 101 can rotate, or the target 101 may be moved circularly around the center of the proton beam, that is, the target 101 may revolve around the center of the proton beam without rotating.

In one embodiment, referring to fig. 1 and 2, target body 1 includes a mount 11, a drive assembly 12, a target holder 13, and a neutron target tube 14. Wherein, the mounting seat 11 and the driving component 12 form a part of a driving assembly, and the target holder 13 and the neutron target tube 14 form a part of a target head assembly. The mounting plate 11 is used to provide support for the drive assembly 12, the target holder 13 and the neutron target tube 14. The driving assembly 12 is disposed on the mount 11. For example, the mounting base 11 includes a first platform 111 and a second platform 112, a slot is provided on the first platform 111, the driving component 12 can be clamped in the slot, and then fixed on the first platform 111 by a bolt; the second platform 112 is fixed with the first platform 111, and the thickness is increased, so that the support for the target head assembly is increased, and meanwhile, the replacement and installation are facilitated; the first platform 111 and the second platform 112 may also be integrally formed.

One end of the target 13 is connected to the drive assembly 12. For example, the target holder 13 may be made of aluminum alloy or stainless steel, the target holder 13 has two wide ends and a thin middle, and the end of the target holder 13 close to the driving assembly 12 has a hole for fixing the target holder 13 to the driving assembly 12 by bolts. The target sheet 101 is located in the neutron target tube 14, and the neutron target tube 14 is arranged at one end of the target frame 13 far away from the driving assembly 12. For example, the target holder 13 has a through hole 13a at an end thereof remote from the driving assembly 12, the neutron target tube 14 is inserted and fixed in the through hole 13a, the target plate 101 is located in the neutron target tube 14, and the accelerator is fixed at an end of the neutron target tube 14. The through hole 13a may be a circular hole, and the neutron target tube 14 may be a hollow cylindrical shape having an outer diameter adapted to the through hole 13 a. The driving assembly 12 drives the target holder 13 to make eccentric motion, so that the target sheet 101 makes circular motion around the center of the proton beam. For example, the driving assembly 12 may drive the target holder 13 to move eccentrically, and then drive at least a portion of the neutron target tube 14 to move the target 101 circularly around the center of the proton beam.

It can be understood that the target holder 13 drives the neutron target tube 14 to make the target sheet 101 rotate circumferentially around the center of the proton beam, which means that the projection is along the axial direction of the neutron target tube 14, please refer to fig. 3, the target sheet 101 will make a circular motion around the center of the proton beam, and will pass through positions a, B, C, and D in sequence, that is, the target sheet 101 revolves around the center of the proton beam, and the target sheet 101 itself cannot rotate because of being fixed. The neutron target tube 14 is at least partially arranged in vacuum, and the target sheet 101 does not rotate, so that the sealing treatment of the target sheet 101 arranged in the neutron target tube 14 is facilitated.

This embodiment drives the target frame 13 through drive assembly 12 and makes eccentric motion, make the target sheet 101 that is located neutron target tube 14 do circular motion around the center of proton beam, can change the beam spot of beam current in the position on target sheet 101 surface, the effective area that the beam spot shines on target sheet 101 has been increased, reduce the local beam deposition energy of target sheet 101, can greatly reduce the target sheet 101 because of the high condition that melts down the fracture of high temperature, improve the upper limit of the proton beam current intensity that target sheet 101 can bear, can bombard more monoenergetic neutrons in unit interval, make the monoenergetic neutron reference radiation field of establishment more accurate and reliable, moreover, the steam generator is simple in structure, and convenient operation.

In one embodiment, referring to fig. 2, the neutron target tube 14 includes a vacuum target tube 141, a bellows 142, and a fixed tube 143. One end of the vacuum target tube 141 is fixed to the target holder 13, and the target 101 is positioned in the other end of the vacuum target tube 141. For example, one end of the vacuum target tube 141 is fixed in the through hole 13a of the target holder 13 and partially exposed in the through hole 13a, and the target 101 is located in the end of the vacuum target tube 141 away from the through hole 13 a. One end of the bellows 142 is connected to one end of the vacuum target tube 141 fixed to the target holder 13. For example, one end of the bellows 142 is connected to a portion of the vacuum target pipe 141 exposed from the through hole 13 a. The end of the bellows 142 remote from the vacuum target tube 141 is connected to a fixed tube 143, and the fixed tube 143 is used for aligning the accelerator so that the proton beam emitted from the accelerator flows through the fixed tube 143, the bellows 142, and the vacuum target tube 141 to bombard the target 101. For example, the fixed tube 143 may be a steel tube, and is generally fixedly disposed relative to the mounting base 11, so as to stably emit the proton beam; the fixing tube 143 can be connected to an end of the bellows 142 away from the vacuum target tube 141 via a flange, so that the nozzle of the fixing tube 143 can be in butt joint with the nozzle of the bellows 142.

It can be understood that there is a large difference between the port diameter of the bellows 142 and the port diameter of the fixed tube 143, because in the emission process of the proton beam, in order to make the proton beam bombard the target 101 during the rotation process, the diameters of the bellows 142 and the vacuum target tube 141 need to be enlarged, so that the proton beam is not blocked by the tube wall during the rotation process, and therefore, some port transition connectors, such as flanges, need to be selected.

It should be noted that, in the rotation process, because the fixing tube 143 is fixedly disposed, one end of the corrugated tube 142 close to the fixing tube 143 is fixed, and one end of the corrugated tube 142 far from the fixing tube 143 rotates along with the target holder 13, so that it can be ensured that the relative position between the proton beam current and the target 101 is changed, and the target 101 makes a circular motion around the center of the proton beam current.

It can be understood that the fixed tube 143 has a fixed property, that is, the linearity of the fixed tube itself does not change greatly, the material may be steel or other rigid metals, and there are two reasons for adopting the fixed tube 143 to connect the accelerator and the corrugated tube 142, i.e., in the emission process of the proton beam, the fixed tube 143 is the first section connected to the accelerator, and the emission trajectory needs to be stabilized to prevent the trajectory from deflecting; and secondly, high temperature resistance is required, and the position of the tube wall away from the proton beam is relatively close to the tube wall due to the thin tube opening of the fixed tube 143, so that the tube needs to bear high temperature.

In this embodiment, the vacuum target tube 141 is used for placing the target sheet 101, the target holder 13 can be twisted while rotating by the bellows 142, and the vacuum degree between the accelerator and the vacuum target tube 141 can be ensured; the fixing tube 143 is provided for stabilizing emission stability of the proton beam.

In an embodiment, the neutron target tube 14 further includes a compression ring nut 144. For example, the end of the vacuum target tube 141 remote from the bellows 142 is threaded, and the retaining ring nut 144 can be threaded to secure the target 101 to the vacuum target tube 141 and stabilize the target 101.

In one embodiment, the neutron target tube 14 further includes a sealing gasket. For example, the sealing washers are O-shaped washers, and the number of the sealing washers may be two or more, and the sealing washers are respectively disposed on the contact surfaces of the target plate 101, the vacuum target tube 141 and the pressing ring nut 144, so as to isolate the external environment, maintain the vacuum environment in the tube, and provide a buffer to prevent the target plate 101 from being crushed when the pressing ring nut 144 is screwed.

In one embodiment, the neutron target tube 14 further includes vacuum calipers 145, and the number of the vacuum calipers 145 may be two, or more. For example, two vacuum calipers 145 are fixed at the connection of the vacuum target tube 141 and the bellows 142 and at the connection of the fixing tube 143 and the bellows 142, and maintain an internal vacuum environment.

In one embodiment, the drive assembly 12 includes a power source 121 and a deflection mechanism 122. The power source 121 is provided on the mount 11 for providing a driving force. Specifically, the power source 121 includes a stepping motor 1211 and a motor base 1212, the motor base 1212 is fixed in the slot on the first platform 111 by a bolt, and the stepping motor 1211 is fixed on the motor base 1212 by a bolt; the stepper motors 1211 may be remotely controlled to adjust the rotational speed of the respective stepper motor 1211 in accordance with the bombardment requirements. The deflecting mechanism 122 is disposed on the mounting base 11, and connected to the power source 121 and the target holder 13, for driving the target holder 13 to rotate eccentrically. For example, the deflection mechanism 122 may be fixed to the first platform 111 by bolts, one end of the deflection mechanism 122 is connected to the rotating shaft of the stepping motor 1211, and the other end is connected to the target holder 13, and the power source 121 provides a driving force to drive the target holder 13 to perform an eccentric motion via the deflection mechanism 122.

In an embodiment, the power source 121 may also be a manual type, and the position of the target 101 bombarded by the proton beam may be precisely controlled by applying power manually, so as to fully utilize the target 101 and save cost.

It can be understood that the reason for adopting the eccentric rotation is that, when the target 101 is bombarded by the proton beam, if the target 101 does not rotate, the proton beam only bombards the same position of the target 101, and the target 101 is overheated and melted, for example, the target 101 rotates around its center, i.e. rotates, if the center of the target 101 and the center of the proton beam are coaxially arranged, the proton beam only bombards the same position of the target 101, and as with the above-mentioned non-rotation, the relative position between the proton beam and the target 101 is not changed essentially; if the center of the target 101 and the center of the proton beam are eccentrically disposed, the sealing process between the target 101 and the vacuum target tube 141 is complicated, the sealing cost is high, and the sealing effect and reliability may be poor.

In this embodiment, the driving force from the power source 121 drives the target holder 13 to eccentrically rotate through the deflection mechanism 122, so that the relative position between the proton beam and the target 101 can be changed, the condition that the proton beam fixedly bombards the same position is reduced, and the local over-temperature of the target 101 is reduced.

In one embodiment, the driving assembly 12 further includes a coupling 123, and the coupling 123 is connected between the power source 121 and the deflection mechanism 122 for transmitting the driving force, improving the transmission precision between the power source 121 and the deflection mechanism 122, reducing the alignment error between the two, and performing a damping function.

In one embodiment, the deflection mechanism 122 may be a disk, the rotating shaft of the power source 121 is fixedly inserted into the center of the disk, and one end of the target 101 is fixed at an off-center position of the disk, so as to realize the eccentric rotation of the target holder 13.

In an embodiment, the corresponding deflection mechanism 122 may also be arranged according to the size of the target 101, so that when the deflection mechanism 122 drives the target holder 13 to rotate eccentrically, the proton beam can be bombarded to any position on the target 101, and the target can be fully utilized.

In one embodiment, the deflection mechanism 122 includes a drive pulley assembly 1221, a driven pulley assembly 1222, and a timing belt 1223. The driving wheel assembly 1221 is arranged on the mounting seat 11 and is in driving connection with the power source 121. Driven wheel assembly 1222 is mounted on mounting base 11, and target frame 13 is connected at one end to driving wheel assembly 1221 and driven wheel assembly 1222.

It will be appreciated that the drive wheel assembly 1221 and driven wheel assembly 1222 may be identical in construction, or changes may be made in the arrangements conventional in the art, with some differences in the construction of the drive wheel assembly 1221 and driven wheel assembly 1222. For example, drive wheel assembly 1221 may differ from driven wheel assembly 1222 in that driven wheel assembly 1222 is not connected to power source 121 at one end, i.e., the end of power wheel 12212 distal from drive shaft 12213 is directly tightened through a bearing washer and nut, but this does not affect the transmission between the two. Therefore, the drive wheel assembly 1221 will be exemplified below.

Specifically, referring to fig. 4, the drive wheel assembly 1221 includes a bearing assembly 12211, a power wheel 12212, and a drive shaft 12213. For example. The power wheel 12212 is composed of two parts, one part is a connecting shaft 12212a, the other part is a rotating disc 12212b, the connecting shaft 12212a penetrates through the bearing assembly 12211 and then is in driving connection with the power source 121, and the rotating disc 12212b is clamped on one side, far away from the power source 121, of the bearing assembly 12211; referring to the drawings, the driving shaft 12213 is composed of two parts, one part is a connecting block 12213a, the other part is a fixing shaft 12213b, a position of the rotating disc 12212b, which is close to one side of the bearing assembly 12211 and deviates from the center, is provided with a limiting groove matched with the connecting block 12213a, the connecting block 12213a is located in the limiting groove and fixed on the rotating disc 12212b through a screw or a bolt, and the fixing shaft 12213b penetrates through the rotating disc 12212b and then is fixedly connected with the target frame 13.

Further, the bearing assembly 12211 includes a bearing seat, a bearing holder, and a circlip. For example, the bearing seat may be fixed in a slot on the first platform 111 by a fastener such as a bolt or a screw, and the connecting shaft 12212a passes through the bearing seat; the bearing can be a deep groove ball bearing, is arranged in the bearing seat and is sleeved on the connecting shaft 12212 a; the bearing fixing seat covers the bearing and is fixed on one side of the bearing seat close to the power source 121; the number of the circlips may be two, one of the circlips is located on the end surface of the bearing contacting the bearing holder, and the other circlip is located on the end surface of the bearing contacting the connecting shaft 12212 a.

Further, a timing belt 1223 connects drive wheel assembly 1221 and driven wheel assembly 1222 such that drive wheel assembly 1221 moves driven wheel assembly 1222 in a synchronized manner. For example, the timing belt 1223 may be coupled to powered wheels on the drive wheel assembly 1221 and the driven wheel assembly 1222 for synchronous rotation.

In one embodiment, the timing belt 1223 may be a smooth or rack-and-pinion conveyor belt. For example, the power wheel 12212 may further include a transmission gear 12212c, the synchronous belt 1223 may be a transmission chain, the connecting shaft 12212a penetrates through the transmission gear 12212c, so that the transmission gear 12212c is located between the rotating disc 12212b and the bearing seat, and the transmission gear 12212c and the rotating disc 12212b are fixed by a fastener such as a bolt, and the transmission chain connects the two transmission gears 12212c on the driving wheel assembly 1221 and the driven wheel assembly 1222 together to achieve synchronous rotation.

This embodiment is through fixing target frame 13 respectively on driving wheel assembly 1221 and driven wheel assembly 1222 to set up hold-in range 1223 and realized the simultaneous movement of two subassemblies, can greatly improve the rotational stability of target piece 101, and improve target frame 13's holding power.

In one embodiment, the deflection mechanism 122 may include only the drive wheel assembly 1221, which is cost effective.

In one embodiment, referring to fig. 6, the deflection mechanism 122 further includes a tensioning device 1224, the tensioning device 1224 being disposed on the mounting base 11 for tensioning a timing belt 1223 to move the driven wheel assembly 1222 synchronously with the driving wheel assembly 1221. Specifically, the tensioning device 1224 includes a tensioning abutment 12241, a tensioning wheel 12242, and an abutment 12243. The tension bracket 12241 is fixed to the mount 11. For example, the tensioning mounts 12241 may be secured within slots on the first platform 111 by fasteners such as bolts. One end of the tension pulley 12242 is adjustably disposed on the tension support 12241, and the circumferential surface of the other end is rotatably abutted against the timing belt 1223. For example, the tensioning wheel 12242 can be composed of two parts, one part is a rotating wheel, the other part is a tensioning shaft, the rotating wheel is connected with the tensioning shaft, the rotating wheel can be arranged below the synchronous belt 1223, a waist-shaped hole is formed in the tensioning support 12241, a thread is arranged at one end of the tensioning shaft, the tensioning shaft penetrates through the waist-shaped hole and then is fixed on the tensioning support 12241 through a nut, and a proper position can be selected in the waist-shaped hole to be fixed according to the tensioning degree requirement of the synchronous belt 1223. One end of the abutting member 12243 is located in the tension support 12241 and adjustably abuts against the tension pulley 12242 to adjust the tension of the tension pulley 12242 to the timing belt 1223. Specifically, one end of the abutment 12243 may be vertically connected to the mounting base 11, and the other end abuts against the tension wheel 12242 for supporting the tension wheel 12242. For example, the abutment 12243 may be fixed vertically on the first platform 111 at one end and abut the tensioning shaft within a kidney-shaped hole at the other end, preventing the tensioning shaft from shifting within the kidney-shaped hole.

It can be understood that, when the tensioning wheel 12242 is located below the synchronous belt 1223, in order to tension the synchronous belt 1223, the tensioning wheel 12242 needs to be moved upwards to tension the synchronous belt 1223, at this time, the synchronous belt 1223 applies downward pressure to the tensioning wheel 12242, although there is a nut at one end to provide fastening force, the fastening effect is limited, and the tensioning wheel 12242 cannot be effectively prevented from moving up and down in the kidney-shaped hole, so that an abutting part 12243 needs to be arranged below the tensioning wheel 12242 to balance the downward pressure applied to the tensioning wheel 12242 by the synchronous belt 1223, the tensioning effect on the synchronous belt 1223 is enhanced, slipping on the transmission gear 12231 is prevented, and the transmission precision is improved.

In one embodiment, the tension pulley 12242 may also be positioned above the timing belt 1223 to press down on the timing belt 1223 to facilitate adjustment of the fastening member 12243.

It will be appreciated that when the tension pulley 12242 is positioned above the timing belt, since the force applied to the tension pulley 12242 by the timing belt 1223 is upward, the abutment 12243 is required to abut the tension pulley 12242 downward to prevent the tension pulley 12242 from running upward.

The present embodiment enables the driven wheel assembly 1222 and the driving wheel assembly 1221 to move synchronously by arranging the tension device 1224 on the synchronous belt 1223, thereby making the transmission more accurate and smooth.

In one embodiment, referring to fig. 1, the target rotating apparatus 100 includes a target holder 2, a target body 1 is disposed on the target holder 2, and the target holder 2 is configured to enable an arrangement position of the target body 1 to be adjustable so as to enable a proton beam to bombard a target sheet 101.

Specifically, the target holder 2 includes a holder column 21, a three-dimensional slide table 22, and a slide table mounting plate 23. One end of the bracket upright post 21 is disc-shaped, the surface of the bracket upright post is distributed with a plurality of threaded holes, and the bracket upright post can be fixed on the ground through fasteners such as bolts or screws. The three-dimensional slide table 22 is connected to the target main body 1 for adjusting the setting position of the target main body 1. The sliding table mounting plate 23 is arranged on the support upright post 21, the three-dimensional sliding table 22 is arranged on the sliding table mounting plate 23, and the sliding table mounting plate 23 is used for adjusting the position of the three-dimensional sliding table 22 relative to the sliding table mounting plate 23. For example, the other end of the bracket upright 21 is plate-shaped, and is provided with a plurality of mounting holes, and the sliding table mounting plate 23 can be butted with different mounting holes according to the position requirement to adjust the position; the three-dimensional slide table 22 is mounted above the slide table mounting plate 23 and below the mounting base 11, and can adjust the target main body 1 to move in the three-dimensional direction.

Further, referring to fig. 7 to 9, the three-dimensional sliding table 22 includes a first module 221, a second module 222, and a third module 223 that are connected to each other in a vertical direction. Specifically, the first assembly 221 may move the target body 1 in a lateral direction, the second assembly 222 may move the target body 1 in a longitudinal direction, and the third body may move the target body 1 in a vertical direction. For example, the first assembly 221 includes a first plate 2211, a second plate 2212, a first fixing block 2213 and a first positioning screw 2214, the first plate 2211 may be fixed on the sliding table mounting plate 23 by bolts, the first fixing block 2213 is fixed on the outer side of the second plate 2212 in the transverse direction, the first positioning screw 2214 is fixed on the outer side of the first plate 2211 in the transverse direction and is on the same side as the first fixing block 2213, one end of the first positioning screw 2214 is connected with the first fixing block 2213, by rotating the first positioning screw 2214, the extended screw pushes or pulls the first fixing block 2213 to drive the second plate 2212 to move in the transverse direction.

The second assembly 222 includes a third plate 2221, a fourth plate 2222, a second fixing block 2223, and a second position adjusting screw 2224, where the third plate 2221 is fixedly connected to the second plate 2212, the second fixing block 2223 is fixed to the fourth plate 2222 along the outer side of the longitudinal direction, the second position adjusting screw 2224 is fixed to the third plate 2221 along the outer side of the longitudinal direction and is located at the same side as the second fixing block 2223, one end of the second position adjusting screw 2224 is connected to the second fixing block 2223, and the second position adjusting screw 2224 is rotated so that the extended screw pushes or pulls the second fixing block 2223 to drive the fourth plate 2222 to move along the longitudinal direction.

A third assembly 223 including a fifth plate 2231, a sixth plate 2232, a third fixing block 2233 and a third positioning screw 2234, wherein the fifth plate 2231 is fixedly connected to the fourth plate 2222, the sixth plate 2232 is connected to the mounting seat 11, the third fixing block 2233 includes an abutting end 22331 and a pushing end 22332 which are perpendicularly connected to each other, the pushing end 22332 is in contact with the sixth plate 2232, a through slot is formed at the junction of the abutting end 22331 and the pushing end 22332, the pushing end 22332 can rotate around the screw by fixing the inner side of the sixth plate 2232 with the screw, the third positioning screw 2234 is fixed to the fifth plate 2231, one end of the third positioning screw 2234 is connected to the abutting end 22331, and the protruding screw pushes the abutting end 22331, and the pushing end 22332 rotates around the screw and the sixth plate 2232 to push the sixth plate 2232 to move in the vertical direction.

It is to be understood that the second plate member 2212, the fourth plate member 2222 and the sixth plate member 2232 in the above-mentioned "the second plate member 2212 moves in the transverse direction", "the fourth plate member 2222 moves in the longitudinal direction" and "the sixth plate member 2232 moves in the vertical direction" refer to direct acting objects, and not only these plate members move but the target body 1 does not move, and in fact, under the gravity of the target body 1 and the connection of the respective components, the indirect object of the final movement is the target body 1, that is, the movement of the second plate member 2212, the fourth plate member 2222 and the sixth plate member 2232 correspondingly moves the target body 1, and the directions are consistent.

In this embodiment, the mounting positions are changed by the support upright 21 and the sliding table mounting plate 23 to perform rough adjustment of the position of the target main body 1, and the three-dimensional sliding table 22 is arranged to be adjusted by screws, so that the position of the target main body 1 can be accurately adjusted, proton beam can bombard on the target sheet 101, and the operation is simple and fine and adjustable.

In an embodiment, the three-dimensional sliding table 22 further includes a locking member 224, and the locking member 224 is respectively disposed on the first assembly 221, the second assembly 222, and the third assembly 223 and is used for fixing relative positions between the first plate 2211 and the second plate 2212, the third plate 2221 and the fourth plate 2222, and the fifth plate 2231 and the sixth plate 2232, so as to reduce play and improve the working stability of the target body 1.

In one embodiment, the first plate 2211, the third plate 2221 and the fifth plate 2231 respectively have guide slots, the guide slots are respectively oriented in the same direction as the second plate 2212, the fourth plate 2222 and the sixth plate 2232, the second plate 2212, the fourth plate 2222 and the sixth plate 2232 respectively have protrusions thereon, and the first positioning screw 2214, the second positioning screw 2224 and the third positioning screw 2234 are respectively rotated to enable the protrusions to move in the guide slots.

It can be understood that the reason for arranging the guide groove and the protrusion is two points, one is convenient for sliding, and the arrangement of the guide groove can reduce the friction between two plates which slide relatively and improve the moving precision; second, when a moving operation is performed in one assembly, the plate members may slide out, for example, when a lateral moving operation is performed, because the first plate member 2211 is fixed to the slide mounting plate 23, the first adjusting screw may push the second plate member 2212 to move, and because the second plate member 2212 is fixed to the third plate member 2221, if a guide groove and a protrusion are not provided between the third plate member 2221 and the fourth plate member 2222, friction may be insufficient, and then the second plate member 2212 may directly slide out with the third plate member 2221, so that the fourth plate member 2222 or a device thereon cannot be pushed to move, or the pushing distance is small, so that the moving accuracy is greatly reduced. The guide groove is arranged along the moving direction, and in fact, one direction is limited to the other direction, so that the push is facilitated.

In one embodiment, referring to fig. 10, the rotary target apparatus 100 further includes a aligning plate 3, one end of the aligning plate 3 is detachably disposed on the target body 1, and the other end has a hole slot for aligning with the accelerator, and the target holder 2 is adjusted to position the disposition position of the target body 1. For example, the alignment plate 3 may be inserted into a slot on the first platform 111, so as to facilitate installation and detachment; when the setting position of the target main body 1 is positioned, the rough adjustment may be performed by using the stand column 21 and the slide table mounting plate 23, and then the fine adjustment may be performed by using the three-dimensional slide table 22, so that the hole groove is aligned with the accelerator to position the setting position of the target main body 1. It will be appreciated that the relative positions of the various components on the mounting base 11 are pre-designed, that is, by aligning the plate 3 with the accelerator, the position of the target body 1 is determined, i.e. the neutron target tube 14 is then aligned with the accelerator.

In the embodiment, the alignment plate 3 is aligned with the accelerator, so that the position of the target body 1 can be located, subsequent installation and alignment of the neutron target tube 14 are facilitated, and the installation efficiency is improved.

In one embodiment, the rotary target apparatus 100 includes a cooling air duct for blowing cooling air to the back of the target 101 to reduce the temperature of the target 101. For example, the cooling gas pipe can be disposed on the neutron target tube 14 with one end bent to enter along the end of the vacuum target tube 141 away from the bellows 142 and fixed on the inner wall so that the orifice of the cooling gas pipe is aligned with the back of the target 101.

It will be appreciated that the cooling gas line cannot be inserted vertically towards the end of the vacuum target tube 141 remote from the bellows 142, since it would affect the outgoing neutrons and must be bent into along the outer contour of the vacuum target tube 141; because the gas is cooled and has a certain distance with the target sheet 101, neutrons which are reacted with the target sheet 101 cannot generate a moderating effect; the cooling gas pipeline that this application adopted can be through adjusting the overheated position of aiming at target piece 101, can take away the deposition heat of target piece 101 by a wide margin to and reduce the decay to the emergent neutron.

The above description is only a preferred embodiment of the present application, and is not intended to limit the present application, and it is obvious to those skilled in the art that various modifications and variations can be made in the present application. All changes, equivalents, modifications and the like which come within the spirit and principle of the application are intended to be embraced therein.

Claims

1. A rotary target apparatus for a monoenergetic neutron reference radiation field, comprising:

2. The rotary target apparatus of claim 1, wherein the target body comprises:

a mounting seat;

the driving assembly is arranged on the mounting seat;

the target frame is connected with the driving assembly at one end;

3. The rotary target apparatus of claim 2, wherein the drive assembly comprises:

4. The rotary target apparatus of claim 3, wherein the deflection mechanism comprises:

the driven wheel assembly is arranged on the mounting seat, and one end of the target frame is connected with the driving wheel assembly and the driven wheel assembly respectively;

5. The rotary target apparatus of claim 4, wherein the deflection mechanism further comprises:

and the tensioning device is arranged on the mounting seat and used for tensioning the synchronous belt so as to enable the driven wheel assembly and the driving wheel assembly to move synchronously.

6. The rotary target apparatus of claim 5, wherein the tensioning device comprises:

the tensioning support is fixed on the mounting seat;

one end of the abutting piece is located in the tensioning support and is adjustably abutted to the tensioning wheel so as to adjust the tensioning force of the tensioning wheel on the synchronous belt.

7. The rotary target apparatus of claim 2, wherein the neutron target tube comprises:

8. The rotary target assembly of claim 7, wherein the neutron target tube comprises a compression ring nut, the vacuum target tube has threads on the other end, and the compression ring nut secures the target plate to the vacuum target tube by threading.

9. The rotary target apparatus according to claim 1, wherein the rotary target apparatus comprises:

10. The rotary target apparatus of claim 9, further comprising:

11. The rotary target apparatus of claim 9, wherein the target holder comprises:

a bracket upright post;

12. The rotary target apparatus of claim 1, further comprising: