CN215995324U - Head structure of stripping target for BNCT accelerator - Google Patents
Head structure of stripping target for BNCT accelerator Download PDFInfo
- Publication number
- CN215995324U CN215995324U CN202120544922.4U CN202120544922U CN215995324U CN 215995324 U CN215995324 U CN 215995324U CN 202120544922 U CN202120544922 U CN 202120544922U CN 215995324 U CN215995324 U CN 215995324U
- Authority
- CN
- China
- Prior art keywords
- stripping
- positioning
- pin
- positioning cone
- horn
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Particle Accelerators (AREA)
Abstract
The utility model discloses a head structure of a stripping target for a BNCT accelerator, which comprises a stripping membrane component, a positioning cone and a stripping target main shaft, wherein the stripping membrane component is provided with a stripping membrane component taper hole and a horn-shaped strip opening, the stripping membrane component taper hole can be simply and conveniently mounted and dismounted by a pulling and inserting method, the stripping membrane component taper hole is matched with the positioning cone in size, the horn-shaped strip opening is matched with a positioning cone pin on the positioning cone, and the positioning cone pin is fixed on the positioning cone without being dismounted; the stripping membrane assembly is connected with the stripping target main shaft through a positioning cone; the utility model solves the problem of simple installation by changing the shape, position and size of the elements, and can use a robot hand to replace manual operation, thereby thoroughly solving the problem of harming human health. The utility model is improved from the limited contact of two step surfaces of the positioning shaft to the contact of two conical surfaces between the stripping membrane component and the positioning cone, and the contact area is increased by several times.
Description
Technical Field
The utility model belongs to the technical field of BNCT accelerators, and particularly relates to a head structure of a stripping target for a BNCT accelerator.
Background
BNCT (boron neutron capture) cancer therapy is a novel cancer therapy mode developed in recent years, is one of the international leading-edge anticancer therapy technologies at present, and has the principle that a medicine containing a nonradioactive boron isotope (boron-10) is used as a tumor positioning medicine and a neutron capture agent, after the medicine is injected into a human body, when the medicine reaches a certain concentration in a tumor, a neutron beam generated by targeting with an accelerator is used for irradiating the tumor of the human body, the neutron beam and the boron isotope (boron-10) generate a nuclear reaction to generate radioactive particles, cancer cells are accurately destroyed in the cancer cells, and normal tissues are not accidentally injured. Is a novel cancer treatment technology which is currently and internationally developed.
A miniaturized BNCT cancer treatment device based on a high-current cyclotron is a latest generation cancer treatment device which is innovatively developed by the Chinese atomic energy science research institute, a high-current proton beam with the intensity of more than 1mA is led out by the device through the 14MeV high-current cyclotron, a beryllium target is bombarded to generate a neutron beam, and neutron energy spectrum distribution required by treatment is obtained through a moderator.
The BNCT strong-flow cyclotron target stripping system is the key equipment of accelerator, and its function is to accelerate the accelerator with negative hydrogen (H) by stripping the extremely thin carbon film on the target-) The beam strips off two electrons to form proton (H)+) And the beam flows are led out to a beam flow line through a lead-out opening so as to realize reverse operation.
The high-current proton beam with the current of more than 1mA is led out, and the beam current power is large, so that the thermal deposition on the stripping target carbon film is more than 2 times higher than the original 300uA current, and the following problems are brought along:
1) the carbon film is frequently replaced, and the residual dosage has great harm to human body. The carbon film is very thin, and has short service life due to the fact that the carbon film is always subjected to beam bombardment and thermal deposition and needs to be replaced frequently. The stripping target in the prior art has a complex structure, the replacement time of the stripping membrane assembly is long, and meanwhile, the position of the stripping target is the area with the most serious beam bombardment, and the residual dose of the stripping target has larger harm to human bodies; the structure of the stripping target is complicated as shown in FIG. 6, the stripping target needs to be aligned twice in the installation process, the first time is the positioning of the positioning shafts 1-4 and the stripping target main shaft, and as the upper and lower thicknesses of the positioning shafts 1-4 are the same, the positioning shafts 1-4 can be inserted into the stripping target main shafts 1-3 only by strictly aligning the circular holes of the positioning shafts 1-42 and the stripping target main shafts 1-3 during alignment; the second alignment is the positioning of the pin 1-4-1 and the positioning shaft 1-4, and the pin 1-4-1 adopts a circular hole design, so that the pin can be inserted after the stripping membrane assembly is installed and the positioning hole is aligned.
2) Because the high beam current intensity and the high beam current power are led out by the BNCT strong current cyclotron, the cooling effect of a stripping target system needs to be further improved, but the cooling effect of the stripping target structure in the prior art is poor, as shown in FIG. 6, an original stripping membrane component 1-1 needs to be cooled by using a 1-4 positioning shaft, the original positioning shaft 1-4 structure is a double-cylinder structure with steps, the actual cooling contact surface of the stripping membrane component is only the step position, two cylindrical surfaces cannot be really in close contact, and the positioning shaft and the main shaft are made of stainless steel, which is poor in heat conduction effect compared with copper, so that the cooling effect is seriously affected.
3) The pin is easy to activate and the like; under the non-working state, the positions of the pins 1-1-4 can be bombarded by beam current, so that the material is activated, and the later maintenance is seriously influenced.
In a word, the BNCT high-current cyclotron realizes a high-current proton beam of more than 1mA, so that the carbon film is subjected to beam bombardment and the thermal deposition degree is doubled, the original stripping target has a complex structure, the stripping film assembly is long in replacement time, the cooling effect is poor, the pins are easy to activate and the like, and the actual use requirement that the stripping target can strip negative hydrogen beams of more than 1mA cannot be met.
SUMMERY OF THE UTILITY MODEL
Aiming at the problems in the prior art, the utility model discloses a head structure of a stripping target for a BNCT accelerator, and aims to solve the problems that the original stripping target is complex in structure, a stripping membrane assembly is long in replacement time, poor in cooling effect, easy to activate pins and incapable of meeting the actual use requirement that the stripping target can strip negative hydrogen beams of more than 1 mA.
The utility model adopts the following technical scheme for solving the technical problems:
a head structure of a stripping target for a BNCT accelerator comprises a stripping membrane component 2-1, a positioning cone 2-2 and a stripping target main shaft 2-3, and is characterized in that: the stripping membrane component 2-1 is provided with a stripping membrane component taper hole 2-1-6 and a horn-shaped strip opening 2-1-7, the stripping membrane component 2-1 can be simply and conveniently mounted and dismounted by a pulling and inserting method, the stripping membrane component taper hole 2-1-6 is matched with the positioning cone 2-2 in size, the horn-shaped strip opening 2-1-7 is matched with a positioning cone pin 2-1-4 on the positioning cone 2-2, and the positioning cone pin 2-1-4 is fixed on the positioning cone 2-2 without being dismounted; the stripping membrane assembly 2-1 is connected with the stripping target main shaft 2-3 through a positioning cone 2-2.
The positioning cone 2-2 comprises an upper part, a middle part and a lower part, wherein the upper part is of a conical structure, the middle part is a boss with the diameter matched with the main shaft of the stripping target, and the lower part is a cylinder with external threads; the side surface of the conical structure at the half-height is transversely fixed with a positioning conical pin 2-1-4, the positioning conical pin 2-1-4 is matched with a horn-shaped strip opening 2-1-7 of the stripping membrane component 2-1 and is embedded into the horn-shaped strip opening 2-1-7, and the angular position of the stripping membrane component 2-1 is fixed through the positioning conical pin 2-1-4.
The horn-shaped strip gap 2-1-7 is not only: the top of the opening 2-1-7 is a strip shape with equal width, two sides of the top extending downwards are splayed and expanded outwards, and the cross section is a horn-shaped opening; the width of the horn-shaped strip opening (2-1-7) at the top is approximately equal to the diameter of the pin and used for limiting the amount of the rack on the left and the right of the pin, and the horn-shaped opening at the bottom facilitates the pin to be embedded into the opening.
The stripping membrane component 2-1 comprises a stripping membrane frame 2-1-1, a pressing plate 2-1-2, a stripping membrane 2-1-3, a positioning taper pin 2-1-4, a pin hole 2-1-4-1, a screw 2-1-5, a screw hole 2-1-5-1, a stripping membrane component taper hole 2-1-6 and a horn-shaped strip opening 2-1-7; two sides of the stripping film frame 2-1-1 are symmetrically provided with 1 stripping film 2-1-3 at 180 degrees respectively, and the stripping films 2-1-3 are fixed with the stripping film frame 2-1-1 through respective pressing plates 2-1-2, screws 2-1-5 and screw holes 2-1-5-1.
The stripping membrane assembly taper hole 2-1-6 is arranged at the center of the stripping membrane assembly frame 2-1-1 and penetrates through the upper surface and the lower surface of the stripping membrane assembly frame 2-1-1, the height of the stripping membrane assembly taper hole 2-1-6 is matched with the height of the conical structure of the positioning cone 2-2, and the size of the stripping membrane assembly taper hole 2-1-6 on the upper surface of the stripping membrane assembly frame 2-1-1 is smaller than that of the stripping membrane assembly taper hole 2-1-6 on the lower surface.
The horn-shaped strip notch 2-1-7 of the stripping film frame 2-1-1 is formed in a horizontal plane at half height of the stripping film frame 2-1-1, the horn-shaped strip notch 2-1-7 extends to one side end face of the stripping film frame 2-1-1 from a taper hole 2-1-6 of a stripping film assembly of the stripping film frame 2-1-1 in the horizontal direction and penetrates through the side end face, and the length and the height of the horn-shaped strip notch 2-1-7 are matched with the length and the height of the positioning taper pin 2-1-4.
The positioning cone 2-2 is made of copper materials, and the heat dissipation effect is good.
The positioning cone pins 2-1-4 on the positioning cone 2-2 penetrate through the stripping membrane component 2-1 on one side, and the positioning cone pins 2-1-4 are positioned on the non-pin surface of the stripping membrane component 2-1 in a non-working state, so that the activation problem is avoided.
The sizes of the conical holes 2-1-6 of the stripping membrane assembly and the conical holes 2-2 of the positioning cones are consistent, and the selection range of the cone angle is 6-11 degrees, so that the strength of the positioning taper sleeve is ensured.
Advantageous effects of the utility model
1. The utility model solves the problem of simple installation by changing the shape, position and size of the elements, and obtains unexpected effect. The shape of the stripping membrane component is changed from the circular hole alignment of the upper surface and the lower surface to the taper hole alignment of the upper surface and the lower surface; the shape of the positioning shaft is changed from a cylindrical positioning shaft to a conical + pin-shaped positioning shaft; and through changing the installation sequence, the pin is inserted after the counterpoint is performed, and the pin is inserted before the counterpoint is performed, so that the method of one-time pulling and inserting is used for replacing a plurality of round hole counterpoint methods which are time-consuming and labor-consuming, and simultaneously, the leap from quantity change to quality change is realized: because the operation after the improvement is very simple, only need to peel off the membrane module and grab from the top down and transfer to the location awl on, the counterpoint process is the counterpoint of coarse grain moreover, in case coarse grain counterpoint is accomplished the back, can be according to the shape of taper hole or the shape of opening automatic positioning to the target location, this work can replace manual operation with the manipulator completely, has thoroughly solved from a long time not to leave manual operation, harm the problem of the health of the person.
2. The utility model changes the water-cooling heat dissipation contact area of the stripping membrane component and the positioning cone, improves the limited contact of two step surfaces of the positioning shaft into the contact of two conical surfaces between the stripping membrane component and the positioning cone, increases the contact area by several times, and effectively solves the problem that the water-cooling heat dissipation effect brought by the strong current extraction from 300uA to 1mA cannot keep up with the high-current strong heat dissipation requirement.
3. The utility model changes the layout mode of the positioning taper pin, and improves the mode that the original positioning shaft pin penetrates through the front side and the rear side of the stripping membrane assembly into the mode that the positioning taper pin only penetrates through one side of the stripping membrane assembly; the pin in the working state is exposed, but the pin is not activated because the beam is applied to the stripping film and the position of the pin is outside the beam path, so that the problem that the pin is activated is thoroughly solved. Because the problem that the locating cone pin is activated is solved, although the flow intensity is increased to 1mA, the maintenance frequency is reduced, and the requirement of high flow intensity extraction is met.
4. The technical scheme adopted by the utility model well solves the problems of installation, positioning and heat dissipation of the simple stripping film frame, and bidirectional leading-out can be realized by adopting a double-stripping film structure.
Drawings
FIG. 1 is a schematic view of a peel-off target mounting location;
FIG. 2 is a schematic view of a non-operative position of the peeling target;
FIG. 3 is a schematic view of the working position of the peeling target
FIG. 4 is a schematic view of a beam trajectory in a working state of a peeling target;
FIG. 5 is a view showing the structure of an original peeling target device;
FIG. 6 is a sectional view of the original peeling target device;
FIG. 7 is a view showing a positioning cone of the original peeling target device;
FIG. 8-1 is a schematic view of a stripping membrane module of the original target stripping apparatus shown in FIG. 1;
FIG. 8-2 is a schematic view of a stripping membrane module of the original target stripping apparatus shown in FIG. 2;
FIG. 9 is a view showing a structure of a new peeling target device;
FIG. 10 is a sectional view of a new peeling target device;
FIGS. 11-1, 11-2, and 11-3 are views showing the positioning cone of the new peeling target device;
FIG. 12 is a view showing a structure of a stripping membrane module of the new stripping target apparatus;
FIG. 13 is a bottom view of FIG. 12;
FIG. 14 is a view of a peeling film frame;
in the figure:
1: a magnetic pole; 1-1: an original stripping membrane component; 1-2: a nut; 1-3: stripping the target spindle; 1-4: positioning the shaft; 1-1-1: original stripping film frame; 1-1-2: pressing a plate; 1-1-3: stripping the film; 1-1-4: a pin; 1-1-5: a screw; 1-1-6: a water inlet pipe; 1-1-7: a water outlet pipe;
2: stripping the target; 2-1: stripping the membrane assembly; 2-1-1: stripping the film frame; 2-1-2: pressing a plate; 2-1-3: stripping the film; 2-1-4-1: a pin hole; 2-1-4: a pin; 2-1-5: a screw; 2-1-5-1: screw holes; 2-1-6: a tapered hole; 2-1-7: a horn strip-shaped opening; 2-2: positioning a cone; 2-3: stripping the target spindle; 3: a lead-out port; 4: a negative hydrogen beam current; 5: a proton beam current;
Detailed Description
Design principle of the utility model
1. The pins are inserted first and then aligned, and 1 alignment is reduced. Before improvement, the installation of the stripping membrane component 2-1 needs 2 times of contraposition, and after improvement, only 1 time of contraposition is needed, because: after improvement, 2 times of alignment can be carried out simultaneously, namely the alignment of the conical hole 2-1-6 on the stripping film frame 2-1 and the alignment of the horn strip-shaped notch 2-1-7 can be carried out simultaneously. The precondition of simultaneous contraposition is: the pins 2-1-4 are inserted into the positioning cones 2-2 in advance, at this time, the positioning cones 2-2 and the pins 2-1-4 are aligned, then the horn strip-shaped openings 2-1-7 of the stripping membrane assembly 2-1 are aligned with the pins, and meanwhile, the tapered holes 2-1-6 of the stripping membrane assembly 2-1 are aligned with the positioning cones 2-2, so that 2 times of alignment are combined into 1 time of alignment. As shown in figures 11-2, 11-3, 12 and 13, because the bottom opening of the horn-shaped strip opening 2-1-7 is larger than the diameter of the pin 2-1-4, the pin can be easily inserted into the opening, and the upper opening of the horn-shaped strip opening 2-1-7 is small and has the diameter approximately equal to the diameter of the pin, the upper opening can hold the pin 2-1-4 without producing left and right supporting frames, thereby realizing the angular positioning of the stripping membrane assembly 2-1 through the pin 2-1-4 and the horn-shaped strip opening 2-1-7.
2. The insertion type alignment replaces the circular hole alignment, so that time and labor are saved. The key point of the insertion type alignment is that the diameters of two holes aligned with each other are one big and one small, and the large-diameter hole is easy to sleeve the small-diameter hole. According to the utility model, the conical tip at the top of the contraposition positioning cone 2-2 is removed through the conical hole 2-1-6 with the larger relative diameter at the bottom of the stripping membrane component 2-1, so that the contraposition process is simple, convenient and quick; and the pin 2-1-4 with the diameter smaller than that of the positioning cone 2-2 is aligned by stripping the opening at the bottom of the membrane component 2-1 relative to the large horn-shaped gap, so that the alignment process is simple, convenient and quick.
3. The conical surface contact is used for replacing the table-board contact, and the heat dissipation effect is increased by several times. The utility model improves the original limited surface contact of two step surfaces of the stripping membrane component through the positioning shaft into the contact of two conical surfaces between the stripping membrane component and the positioning cone, increases the contact area by several times, and effectively solves the problem that the water-cooling heat dissipation effect brought by the strong current extraction from 300uA to 1mA cannot keep up with the high-current strong heat dissipation requirement.
4. The semi-penetrating pin prevents the pin from being activated. The original positioning shaft pin is positioned by a method of penetrating the front side and the rear side of the stripping membrane component, after improvement, the positioning taper pin is led out from a taper hole 2-1-6 of the stripping membrane component and then extends to one side of the stripping membrane component along the horizontal direction, so that the positioning taper pin only penetrates through one side of the stripping membrane component, when one of the two stripping membrane components is in a working state and the other stripping membrane component is in a non-working state, the pin on the stripping membrane component in the non-working state is in a semi-penetrating mode, and when a beam flows through, the pin on the stripping membrane component is on the non-pin surface of the stripping membrane component, so the pin cannot be activated; the pin in the working state is on the pin surface of the stripping membrane assembly, but the pin can not be activated because the beam is applied to the stripping membrane and the position of the pin is outside the beam path, thereby thoroughly solving the problem that the pin is activated. Because the problem that the locating cone pin is activated is solved, although the flow intensity is increased to 1mA, the maintenance frequency is reduced, and the requirement of high flow intensity extraction is met.
Based on the above principle, the present invention designs a head structure of a stripping target for a BNCT accelerator.
A head structure of a stripping target for a BNCT accelerator is shown in fig. 9, fig. 10, fig. 12 and fig. 13, and comprises a stripping membrane assembly 2-1, a positioning cone 2-2 and a stripping target main shaft 2-3, and is characterized in that: the stripping membrane component 2-1 is provided with a stripping membrane component taper hole 2-1-6 and a horn-shaped strip opening 2-1-7, the stripping membrane component 2-1 can be simply and conveniently mounted and dismounted by a pulling and inserting method, the stripping membrane component taper hole 2-1-6 is matched with the positioning cone 2-2 in size, the horn-shaped strip opening 2-1-7 is matched with a positioning cone pin 2-1-4 on the positioning cone 2-2, and the positioning cone pin 2-1-4 is fixed on the positioning cone 2-2 without being dismounted; the stripping membrane assembly 2-1 is connected with the stripping target main shaft 2-3 through a positioning cone 2-2.
As shown in fig. 11-2 and 11-3, the positioning cone 2-2 comprises an upper part, a middle part and a lower part, wherein the upper part is of a cone structure, the middle part is a boss with a diameter matched with the main shaft of the peeling target, and the lower part is a cylinder with external threads; the side surface of the conical structure at the half-height is transversely fixed with a positioning conical pin 2-1-4, the positioning conical pin 2-1-4 is matched with a horn-shaped strip opening 2-1-7 of the stripping membrane component 2-1 and is embedded into the horn-shaped strip opening 2-1-7, and the angular position of the stripping membrane component 2-1 is fixed through the positioning conical pin 2-1-4.
As shown in fig. 12, 13 and 14, the horn-shaped elongated gap 2-1-7 is either: the top of the opening 2-1-7 is a strip shape with equal width, two sides of the top extending downwards are splayed and expanded outwards, and the cross section is a horn-shaped opening; the width of the horn-shaped strip opening (2-1-7) at the top is approximately equal to the diameter of the pin and used for limiting the amount of the rack on the left and the right of the pin, and the horn-shaped opening at the bottom facilitates the pin to be embedded into the opening.
The stripping membrane component 2-1 is shown in figure 12 and comprises a stripping membrane frame 2-1-1, a pressing plate 2-1-2, a stripping membrane 2-1-3, a positioning taper pin 2-1-4, a pin hole 2-1-4-1, a screw 2-1-5, a screw hole 2-1-5-1, a stripping membrane component taper hole 2-1-6 and a horn-shaped strip notch 2-1-7; two sides of the stripping film frame 2-1-1 are symmetrically provided with 1 stripping film 2-1-3 at 180 degrees respectively, and the stripping films 2-1-3 are fixed with the stripping film frame 2-1-1 through respective pressing plates 2-1-2, screws 2-1-5 and screw holes 2-1-5-1.
As shown in FIG. 10, the stripping membrane module taper holes 2-1-6 are arranged at the center of the stripping membrane frame 2-1-1 and penetrate through the upper surface and the lower surface of the stripping membrane frame 2-1-1, the height of the stripping membrane module taper holes 2-1-6 is matched with the height of the positioning cones 2-2, and the size of the stripping membrane module taper holes 2-1-6 on the upper surface of the stripping membrane frame 2-1-1 is smaller than that of the stripping membrane module taper holes 2-1-6 on the lower surface.
As shown in fig. 13, the horn-shaped long slit 2-1-7 of the stripping film frame 2-1-1 is opened on a horizontal plane at half height of the stripping film frame 2-1-1, the horn-shaped long slit 2-1-7 extends from the conical hole 2-1-6 of the stripping film assembly of the stripping film frame 2-1-1 to one side end face of the stripping film frame 2-1-1 in the horizontal direction and penetrates through the side end face, and the length and height of the horn-shaped long slit 2-1-7 are matched with the length and height of the positioning conical pin 2-1-4.
The positioning cone 2-2 is made of copper materials, and the heat dissipation effect is good.
As shown in fig. 11-3, the positioning cone pins 2-1-4 on the positioning cone 2-2 penetrate the stripping film assembly 2-1 on one side, and in a non-working state, the positioning cone pins 2-1-4 are located on the non-pin surface of the stripping film assembly 2-1, so that the activation problem is avoided.
Supplementary explanation:the stripping membrane component in the non-working state is changed from being perpendicular to the beam direction by 90 degrees to being parallel to 180 degrees in the working state, and at the moment, the stripping membrane component and the beam direction are parallelThe contact surface when the beam flows through is a non-pin surface.
The sizes of the conical holes 2-1-6 of the stripping membrane assembly and the conical holes 2-2 of the positioning cones are consistent, and the selection range of the cone angle is 6-11 degrees, so that the strength of the positioning taper sleeve is ensured.
Based on the stripping target head structure of the BNCT accelerator, the utility model designs a dismounting method of the stripping target head structure, which comprises the following steps:
firstly, fixing a positioning cone pin 2-1-4 on a positioning cone 2-2, and when disassembling the stripping membrane assembly 2-1, fixing the pin 2-1-4 on the positioning cone 2-2 without disassembling;
step two, in the process of installing the stripping membrane assembly, only the damaged stripping membrane assembly 2-1 is required to be pulled out, the stripping membrane assembly taper hole 2-1-6 and the horn-shaped strip notch 2-1-7 of the new stripping membrane assembly are respectively aligned with the top end of the conical structure of the positioning cone 2-2 and the positioning cone pin 2-1-4 on the positioning cone 2-2, the stripping membrane assembly 2-1 is pushed downwards onto the positioning cone 2-2, and the conical surfaces of the stripping membrane assembly are attached by slight force, so that the disassembly and assembly work can be completed;
example one
As shown in fig. 1, two symmetrical peeling targets 2 are mounted on a magnetic pole 1. The beam extraction in two 180-degree symmetrical directions can be realized. And 3 is a beam outlet.
FIG. 2 shows the debonding target in a non-operative position.
Figure 3 shows the peel-off target in the operating position.
FIG. 4 shows the direction of beam extraction for the target in the working position, where 4 is the negative hydrogen (H) entering the previous turn of the target being cyclotron-accelerated inside the accelerator-) The beam current, since it has not yet reached the position of the peeling target, is also negative hydrogen (H)-) Beam current; 5 is a change from negative hydrogen beam to proton beam (H) after target stripping+) The beam current which enters the lead-out opening in the reverse rotation direction is led out. Therefore, the two-way respective extraction can be realized only by controlling the working state of each peeling target.
FIG. 5 and FIG. 6 show the original target stripping structure, which includes the original stripping membrane module 1-1, the main shaft of the stripping target 1-3, and the positioning shaft 1-4, the original stripping membrane module 1-1 is installed on the positioning shaft 1-4, the pin 1-1-4 shown in FIG. 8 is used to fix the original stripping membrane module 1-1, and the positioning shaft 1-4 and the main shaft of the stripping target 1-3 are made of stainless steel material as a whole. The problems existing in the original structure mainly comprise: 1) the stripping membrane component 1-1 is provided with 3 stripping membrane positions, and due to the adoption of the 90-degree included angle, the stripped beam current is easy to block in the actual work. The effect of prolonging the service life of a plurality of original stripping films cannot be achieved, and 2) under the non-working state, the positions 1-1-4 of the pins are bombarded by beam current, so that material activation is caused, and later maintenance is seriously influenced. 3)1-1 the original stripping membrane module 1-1 needs to be cooled by using a positioning shaft 1-4, the structure of the original positioning shaft 1-4 is a double-cylinder structure with steps, the actual cooling contact surface of the stripping membrane module 1-1 is only the step position, the two cylindrical surfaces cannot be really in close contact, and the positioning shaft and the main shaft are made of stainless steel, so that the heat conduction effect is poor, and the cooling effect is seriously influenced. 4) The pins 1-1-4 are designed to be round holes, and the pins can be inserted only after the stripping membrane assembly 1-1 is installed and the positioning holes are aligned. The installation process is complicated and the operator is exposed to more doses.
FIG. 7 is a view showing a positioning cone of the original peeling target device; FIG. 8 is a view showing a structure of a stripping membrane module of an original target stripping apparatus; fig. 9 and 10 show a modified peel-off target structure. Wherein the positioning cone 2-2 is screwed on the 2-3 peeling target main shaft through the bottom thread, and the positioning cone 2-2 can be disassembled and can be replaced at any time if serious activation occurs, thereby reducing the residual dosage of the accelerator. The positioning cone 2-2 is fixed with 2-1-4 pins, and the stripping membrane assembly 2-1 is arranged on the positioning cone 2-2 and fixed in angle position through a pin hole. The positioning cone 2-2 is made of copper materials, and the heat dissipation effect is good.
The size of the stripping membrane assembly taper hole is consistent with that of the positioning taper 2-2, the whole taper surface is a heat dissipation surface, the heat dissipation area is large, and the pin is fixed on the positioning taper 2-2 without disassembly, so that in the process of installing the stripping membrane assembly, only the damaged stripping membrane assembly needs to be pulled out, the new stripping membrane assembly taper hole is aligned with the pin, a new stripping membrane assembly is installed downwards, and the taper surfaces of the stripping membrane assembly are attached with little force, so that the installation work can be completed. The disassembly and assembly process is simple. The pin is unidirectional, and under the non-operating condition, the pin is in the back position, can not be bombarded by the beam current, has reduced the activation problem.
The sizes of the stripping membrane assembly taper hole 2-1-6 and the positioning taper hole 2-2 are consistent, the selection range of the taper angle is 6-11 degrees and less than 6 degrees, and the upper and lower positions of the stripping membrane frame are not guaranteed during installation; if the angle is larger than 11 degrees, the top end of the positioning taper sleeve is too thin, and the strength of the positioning taper sleeve is not suitable to be ensured.
FIG. 14 shows a horn-shaped strip gap structure, the top of the gap is approximately equal to the diameter of the pin, the bottom of the gap is larger than the diameter of the pin, and the horn-shaped strip gap 2-1-7 of the stripping membrane component is aligned with the pin 2-1-4 during installation, so that the stripping membrane component can be conveniently inserted.
The present invention is not limited to the above-mentioned specific embodiments, and those skilled in the art can derive other embodiments according to the technical solutions of the present invention, and the embodiments also belong to the technical innovation scope of the present invention.
Claims (9)
1. A head structure of a stripping target for a BNCT accelerator comprises a stripping membrane component (2-1), a positioning cone (2-2) and a stripping target main shaft (2-3), and is characterized in that: the stripping membrane component (2-1) is provided with a stripping membrane component taper hole (2-1-6) and a horn-shaped strip notch (2-1-7), the stripping membrane component (2-1) can be simply and conveniently mounted and dismounted by a pulling and inserting method, the stripping membrane component taper hole (2-1-6) is matched with the positioning cone (2-2) in size, the horn-shaped strip notch (2-1-7) is matched with the positioning cone pin (2-1-4) on the positioning cone (2-2), and the positioning cone pin (2-1-4) is fixed on the positioning cone (2-2) and does not need to be dismounted; the stripping membrane assembly (2-1) is connected with the stripping target main shaft (2-3) through a positioning cone (2-2).
2. The head structure of claim 1 for a dissection target of a BNCT accelerator, wherein: the positioning cone (2-2) comprises an upper part, a middle part and a lower part, wherein the upper part is of a conical structure, the middle part is a boss with the diameter matched with the stripping target main shaft, and the lower part is a cylinder with external threads; and a positioning cone pin (2-1-4) is transversely fixed on the side surface of the conical structure at the half-height position, the positioning cone pin (2-1-4) is matched with the horn-shaped long strip opening (2-1-7) of the stripping membrane assembly (2-1) and is embedded into the horn-shaped long strip opening (2-1-7), and the angular position of the stripping membrane assembly (2-1) is fixed through the positioning cone pin (2-1-4).
3. The head structure of claim 1 for a dissection target of a BNCT accelerator, wherein: the horn-shaped strip gap (2-1-7) is as follows: the top of the opening (2-1-7) is a strip shape with equal width, two sides of the top extending downwards are splayed and expanded outwards, and the cross section is a horn-shaped opening; the width of the top long-strip-shaped opening (2-1-7) is approximately equal to the diameter of the pin and used for limiting the amount of the rack on the left and the right of the pin, and the bottom flared opening facilitates the pin to be embedded into the opening.
4. The head structure of claim 1 for a dissection target of a BNCT accelerator, wherein: the stripping membrane component (2-1) comprises a stripping membrane frame (2-1-1), a pressing plate (2-1-2), a stripping membrane (2-1-3), a positioning taper pin (2-1-4), a pin hole (2-1-4-1), a screw (2-1-5), a screw hole (2-1-5-1), a stripping membrane component taper hole (2-1-6) and a horn-shaped strip notch (2-1-7); the two sides of the stripping film frame (2-1-1) are symmetrically provided with 1 stripping film (2-1-3) at 180 degrees respectively, and the stripping films (2-1-3) are fixed with the stripping film frame (2-1-1) through respective pressing plates (2-1-2), screws (2-1-5) and screw holes (2-1-5-1).
5. The head structure of claim 2, wherein said head structure comprises: the stripping membrane assembly taper hole (2-1-6) is arranged at the center of the stripping membrane assembly frame (2-1-1) and penetrates through the upper surface and the lower surface of the stripping membrane assembly frame (2-1-1), the height of the stripping membrane assembly taper hole (2-1-6) is matched with the height of the conical structure of the positioning cone (2-2), and the size of the stripping membrane assembly taper hole (2-1-6) on the upper surface of the stripping membrane assembly frame (2-1-1) is smaller than that of the stripping membrane assembly taper hole (2-1-6) on the lower surface.
6. The head structure of claim 4 for a dissection target of a BNCT accelerator, wherein: the horn-shaped strip notch (2-1-7) of the stripping film frame (2-1-1) is arranged on a horizontal plane at half height of the stripping film frame (2-1-1), the horn-shaped strip notch (2-1-7) extends to one side end face of the stripping film frame (2-1-1) from the conical hole (2-1-6) of the stripping film frame (2-1-1) in the horizontal direction and penetrates through the side end face, and the length and the height of the horn-shaped strip notch (2-1-7) are matched with the length and the height of the positioning cone pin (2-1-4) of the positioning cone (2-2).
7. The head structure of claim 1 for a dissection target of a BNCT accelerator, wherein: the positioning cone (2-2) is made of copper materials, and the heat dissipation effect is good.
8. The head structure of claim 1 for a dissection target of a BNCT accelerator, wherein: the positioning cone pins (2-1-4) on the positioning cones (2-2) penetrate through the stripping membrane assembly (2-1) on one side, and the positioning cone pins (2-1-4) are located on the non-pin surface of the stripping membrane assembly (2-1) in a non-working state, so that the activation problem is avoided.
9. The head structure of claim 1 for a dissection target of a BNCT accelerator, wherein: the size of the stripping membrane assembly taper hole (2-1-6) is consistent with that of the positioning taper (2-2), and the selection range of the taper angle is 6-11 degrees so as to ensure the strength of the positioning taper sleeve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120544922.4U CN215995324U (en) | 2021-03-17 | 2021-03-17 | Head structure of stripping target for BNCT accelerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120544922.4U CN215995324U (en) | 2021-03-17 | 2021-03-17 | Head structure of stripping target for BNCT accelerator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215995324U true CN215995324U (en) | 2022-03-11 |
Family
ID=80581607
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120544922.4U Active CN215995324U (en) | 2021-03-17 | 2021-03-17 | Head structure of stripping target for BNCT accelerator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215995324U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113144439A (en) * | 2021-03-17 | 2021-07-23 | 中国原子能科学研究院 | Head structure and mounting method of stripping target for BNCT accelerator |
-
2021
- 2021-03-17 CN CN202120544922.4U patent/CN215995324U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113144439A (en) * | 2021-03-17 | 2021-07-23 | 中国原子能科学研究院 | Head structure and mounting method of stripping target for BNCT accelerator |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP6914870B2 (en) | Radioisotope production equipment | |
| CN215995324U (en) | Head structure of stripping target for BNCT accelerator | |
| US20100067640A1 (en) | High-Power-Density Lithium Target for Neutron Production | |
| CN113144439A (en) | Head structure and mounting method of stripping target for BNCT accelerator | |
| CN108401354A (en) | A kind of rotary target for accelerator neutron generator | |
| Assmann et al. | LHC collimation: design and results from prototyping and beam tests | |
| CN116520650B (en) | Photoetching machine light source head assembly | |
| CN107910240B (en) | Verification tool for ion source of superconducting proton treatment device | |
| CN207337949U (en) | Target assembly and isotope or neutron generation device | |
| CN111257351B (en) | Irradiation water-cooling sample platform | |
| US20140134324A1 (en) | Automatic lithium target regenerating apparatus and automatic lithium target regenerating method | |
| JP3564599B2 (en) | Positron beam source, manufacturing method thereof and positron beam source automatic supply device | |
| Rinckel et al. | LENS operating experience | |
| CN206489097U (en) | A kind of neutron imaging sample continuous detection apparatus | |
| CN107068216B (en) | X-ray flaw detector for welding line of high-temperature gas cooled reactor heat exchange tube | |
| CN111175806A (en) | Beam scattering target device and beam energy dissipation analyzer | |
| CN204167677U (en) | For the plasma excitation source apparatus of laser | |
| KR20240013100A (en) | Modular X-ray Source and X-ray Source Tube Replacement Method for Motion Compensated Tomosynthesis Imaging System | |
| CN220753141U (en) | Multipurpose tip cone for cable | |
| CN108932982B (en) | High beam plasma array source for linear high-intensity magnetic field device | |
| CN220545181U (en) | Carbon black surface atmospheric plasma processing device | |
| CN111642054B (en) | Portable neutron generator | |
| CN111741583B (en) | Integrated desktop type neutron generator | |
| CN204167675U (en) | A kind of plasma excitation source apparatus of high-power laser system | |
| CN218602374U (en) | Ion device of adjustable spraying needle |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |