CN114615787A - Self-sealing protective sealing transmission rod for stripping film of storage chamber of heavy ion accelerator - Google Patents
Self-sealing protective sealing transmission rod for stripping film of storage chamber of heavy ion accelerator Download PDFInfo
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- CN114615787A CN114615787A CN202210340501.9A CN202210340501A CN114615787A CN 114615787 A CN114615787 A CN 114615787A CN 202210340501 A CN202210340501 A CN 202210340501A CN 114615787 A CN114615787 A CN 114615787A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H7/00—Details of devices of the types covered by groups H05H9/00, H05H11/00, H05H13/00
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H13/00—Magnetic resonance accelerators; Cyclotrons
- H05H13/04—Synchrotrons
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Abstract
The invention discloses a sealing transmission rod for self-sealing protection of a stripping film of a storage chamber of a heavy ion accelerator, wherein the front end of the transmission rod is connected with a membrane clamping assembly for replacing a membrane, the transmission rod is connected with a sealing assembly at the rear part of the membrane clamping assembly, when the front end of the transmission rod extends into a dipolar iron vacuum chamber, the sealing assembly is positioned in a dipolar iron vacuum pipeline of a synchronous accelerator, one end of the dipolar iron vacuum pipeline is communicated with the dipolar iron vacuum chamber, and the other end of the dipolar iron vacuum pipeline is communicated with the stripping film storage chamber; the sealing assembly is used for sealing and separating the two sections of dipolar iron vacuum pipeline chambers in front of and behind the sealing assembly so as to separate the dipolar iron vacuum chamber and the stripping film storage chamber. The base and the sealing ring have low manufacturing cost, are convenient to produce and purchase, and reduce the construction cost of equipment; the sealing structure is simple, the sealing effect is outstanding, and the complexity of the equipment can be greatly reduced, so that the reliability of the equipment is improved, and the construction and maintenance cost is reduced.
Description
Technical Field
The invention belongs to the technical field of heavy ion accelerators, and particularly relates to a sealing transmission rod for self-sealing protection of a stripping film of a storage chamber of a heavy ion accelerator.
Background
HIMM (heavy Ion Medical machine) is the first carbon Ion therapy equipment with proprietary intellectual property rights in China. The main body part mainly comprises an isochronous cyclotron, a synchrotron with the accelerating energy of up to 400Mev and a beam transmission line connected with 5 treatment terminals.
The synchrotron is by means of stripping injection, i.e. using C5+The ion bombarded carbon film (stripping film) strips the last extra-nuclear electron and converts it into C6+Ions. In order to ensure the efficiency of beam injection into the synchrotron, the thickness of the carbon film is only 15 mug/cm2(about 0.1 μm) which is a brittle material, slight disturbance may cause cracking of the carbon film. Therefore, in order to ensure the long-term and effective operation of the accelerator device, the stripping film system is designed with a stripping film storage chamber for storing 12 spare carbon films, so that the carbon films can be conveniently replaced when damaged, and the stripping film storage chamber is connected with a carbon film replacing device (refer to patent No. cn202110462833. x).
In the long-term operation process of the accelerator, the whole vacuum environment of the device is damaged due to unexpected factors such as equipment failure and the like. The gas quickly enters the vacuum pipeline of the accelerator through the leakage opening, and the disturbed gas flow impacts the carbon film in use and the spare carbon film in the storage chamber, so that the carbon film is completely damaged, and major accidents are caused.
After the accident happens, the maintenance work of the accelerator is very heavy, and the carbon film needs to be replaced again, and the installation, calibration, leak detection, evacuation and the like are required. Moreover, such a thin carbon film cannot be stored in a normal pressure environment for a long period of time, and requires a very high level of labor for replacing the carbon film, and therefore requires specialized staff to replace the carbon film. The maintenance time cost and the labor cost of the accelerator are greatly increased, and the influence on the synchrotron of the carbon ion treatment device is more important.
At present, most stripping film systems adopt a partition measure, namely, in the running process of an accelerator, a spare carbon film of a storage chamber moves along with a film frame through a motion mechanism, and after the movement is finished, a main accelerator system is partitioned through a valve. The existing protective device adopting the partition method has the following problems:
1. a gear rack or a screw rod corrugated pipe and other transmission mechanisms and various photoelectric and mechanical limiting protection devices need to be inserted into the dipolar iron vacuum pipeline, and the method has the problems of complex equipment, complex debugging, low operation fault tolerance rate and the like; in addition, the equipment inserted into the vacuum chamber also needs to meet the requirement of ultrahigh vacuum admission, and part of components have to adopt customized products, so that the cost such as manufacturing cost, time, manpower, process and the like is greatly increased;
2. the existing partition method protection device usually selects magnetic fluid as a transmission and sealing device, and the sealing principle of the magnetic fluid causes that disordered magnetic fields appear around the magnetic fluid, so that the magnetic fluid device is used in a synchrotron, and two problems are caused inevitably: the magnetic field of each step of the magnetic fluid influences the field uniformity of the diode magnet of the synchrotron; the high field intensity of the dipolar magnet influences the magnetic field distribution of the magnetofluid, resulting in sealing failure;
3. in the existing partition method protection device, after the membrane clamping assembly is inserted into the dipolar iron vacuum, a standby carbon membrane in a storage chamber must be moved to an isolation chamber, and the process requires that a membrane frame attached with the carbon membrane moves stably and slowly, so that the requirements on operators and control programs are high. And during the movement, the vibration will also transmit random mechanical parts to the synchrotron dipolar iron end, causing the accuracy of magnet positioning to exceed the design index.
Disclosure of Invention
The invention provides a sealing transmission rod for self-sealing protection of a stripping film of a storage chamber of a heavy ion accelerator, and aims to solve the problems that the existing heavy ion synchrotron system is complex in partition equipment in front of the storage chamber, large in occupied space, large in control difficulty and high in equipment failure risk.
Therefore, the invention adopts the following technical scheme:
a sealing transmission rod for self-sealing protection of a stripping film of a storage chamber of a heavy ion accelerator is characterized in that the front end of the transmission rod is connected with a membrane clamping assembly for replacing a membrane, the transmission rod is connected with a sealing assembly at the rear part of the membrane clamping assembly, when the front end of the transmission rod extends into a dipolar iron vacuum chamber, the sealing assembly is positioned in a dipolar iron vacuum pipeline of a synchrotron, one end of the dipolar iron vacuum pipeline is communicated with the dipolar iron vacuum chamber, and the other end of the dipolar iron vacuum pipeline is communicated with the stripping film storage chamber; the sealing assembly is used for sealing and separating dipolar iron vacuum pipelines on the front side and the rear side of the sealing assembly, and further separating dipolar iron vacuum chambers and stripping film storage chambers.
Further, the sealing assembly comprises a disc-shaped base, the inner diameter of the base is equal to the outer diameter of the transmission rod, and the outer diameter of the base is smaller than the inner diameter of the dipolar iron vacuum pipeline; the base is fixed on the transmission rod, a first sealing ring is arranged on the inner ring of the base and used for sealing a gap between the outer circumference of the transmission rod and the inner ring of the base; and a second sealing ring is arranged on the outer ring of the base and used for sealing a gap between the inner cavity of the dipolar iron vacuum pipeline and the outer ring of the base.
Further, the first sealing ring comprises at least one, and the second sealing ring comprises at least two.
Further, the first sealing ring is an O-shaped sealing ring, and the second sealing ring is a rectangular sealing ring.
Furthermore, the first sealing ring and the second sealing ring are made of fluororubber.
Further, the air permeability of the first sealing ring and the second sealing ring is not more than 3.6 multiplied by 10-4/Pa·L·cm-1·s-1。
Further, the air-out rate of the first sealing ring and the second sealing ring is not more than 3.5 multiplied by 10-4Pa·L·cm-2·s-1。
Further, the base is made of aluminum alloy.
Furthermore, the outer surface of the base is provided with a plurality of screw holes pointing to the axis, jackscrews are connected in the screw holes, and the base is fixed on the transmission rod through the jackscrews.
The invention has the beneficial effects that:
1. adopting a base after topological optimization, and separating a standby carbon film of a storage chamber of a stripping film system from a dipolar iron vacuum chamber by using double-layer self-sealing and radial sealing; the spare carbon film is protected from the disturbance of the air flow entering the vacuum pipeline from the leakage point, so that operators can have sufficient time to complete the separation of the stripping film system and the main accelerator system, and the spare carbon film is prevented from being damaged due to the disturbance of the air flow when the vacuum environment of the accelerator is damaged; after the synchronous accelerator is cleared, the synchronous accelerator can be quickly recovered to be used, so that the maintenance cost and the maintenance time of the synchronous accelerator are greatly reduced, and the operation is simple and convenient;
2. the base and the sealing ring have low manufacturing cost, are convenient to produce and purchase, and reduce the construction cost of equipment; the sealing structure is simple, the sealing effect is outstanding, and the complexity of the equipment can be greatly reduced, so that the reliability of the equipment and the construction and maintenance cost are improved;
3. when the treatment device under construction or already constructed is reconstructed and upgraded, the original equipment does not need to be changed in design, and the reconstruction and upgrade of the stripping membrane system can be completed only by mounting the sealing assembly on the transmission rod, so that the equipment under construction and already constructed is convenient to maintain and upgrade, and the upgrading cost is reduced;
4. the device does not introduce new magnetic field and mechanical vibration on the basis of the original equipment, prevents the magnetic field and the mechanical vibration from influencing the operation precision of the accelerator main equipment, and ensures the safe and reliable operation of the equipment.
Drawings
FIG. 1 is a front view of the structure of the synchrotron system of the present invention;
FIG. 2 is a top view of FIG. 1;
FIG. 3 is a schematic view of the connection of the seal assembly of the present invention;
figure 4 is a perspective assembly view of a sealing lance head according to the present invention;
in the figure: 1-a stripping film storage chamber, 2-a dipolar iron vacuum pipeline, 3-a dipolar iron vacuum chamber, 4-a sealing assembly, 41-a membrane clamping assembly, 42-a base, 43-a first sealing ring, 44-a second sealing ring, 45-a jackscrew and 5-a transmission rod.
Detailed Description
The invention will be further described with reference to the accompanying drawings in which:
a self-sealing transmission rod for protecting a stripping film of a storage chamber of a heavy ion accelerator is disclosed, wherein the front end of the transmission rod 5 is connected with a membrane clamping assembly 41 for replacing a membrane, and the detailed structures of a synchrotron, the transmission rod 5 and the membrane clamping assembly 41 are disclosed in a patent CN202110462833.X, which is not described again.
The transmission rod 5 is connected with the sealing assembly 4 at the rear part of the membrane clamping assembly 41, and when the front end of the transmission rod 5 extends into the dipolar iron vacuum chamber 3, the sealing assembly 4 is positioned in the synchrotron dipolar iron vacuum pipeline 2. Because one end of the dipolar iron vacuum pipeline 2 is communicated with the dipolar iron vacuum chamber 3, and the other end is communicated with the stripping film storage chamber 1, the sealing component 4 can seal and separate the two sections of dipolar iron vacuum pipeline 2 chambers in front of and behind the sealing component 4, and further separate the dipolar iron vacuum chamber 3, namely the main accelerator vacuum system, from the stripping film storage chamber 1.
The seal assembly 4 includes a disc-shaped base 42, the base 42 preferably being 7075 aluminum alloy, to ensure that the mass of the entire base 42 does not exceed 50 g. The inner diameter of the base 42 is equal to the outer diameter of the transmission rod 5, and the outer diameter is smaller than the inner diameter of the dipolar iron vacuum pipeline 2 (the inner diameter phi of the dipolar iron vacuum pipeline 2 is 53mm, and the outer diameter phi of the base is 52 mm); the base 42 is sleeved and fixed on the transmission rod 5, the outer surface of the base 42 is provided with a plurality of screw holes pointing to the axis, jackscrews 45 are connected in the screw holes, and the base 42 is fixed on the transmission rod 5 through the jackscrews 45. A first sealing groove is formed in the inner ring of the base 42, a first sealing ring 43 is connected in the first sealing groove, and the first sealing ring 43 is used for sealing a gap between the outer circumference of the transmission rod 5 and the inner ring of the base 42. And a second sealing groove is formed in the outer ring of the base 42, a second sealing ring 44 is connected to the second sealing groove, and the second sealing ring 44 is used for sealing a gap between the inner cavity of the dipolar iron vacuum pipeline 2 and the outer ring of the base 42. The number of the first sealing rings 43 and the second sealing rings 44 can be reasonably selected according to actual working conditions, and the first sealing rings 43 are arranged one way, and the second sealing rings 44 are arranged two ways.
In order to improve the sealing effect, the sealing ring needs to meet the following requirements:
1. the first seal ring 43 and the second seal ring 44 are made of fluororubber materials because the fluororubber seal rings have excellent high temperature resistance, excellent aging resistance, excellent chemical stability and excellent mechanical properties;
2. in order to prevent the inner ring of the base 42 from being fixedly connected with the transmission rod 5, no relative displacement exists between the inner ring and the transmission rod, so that the first sealing ring 43 is an O-shaped sealing ring; the second sealing ring 44 is arranged on the outer ring of the base 42, the second sealing ring 44 needs to slide back and forth relative to the dipolar iron vacuum pipeline 2, and in order to prevent the second sealing ring 44 from being separated from the second sealing groove, the second sealing ring 44 is a rectangular sealing ring;
3. in order to meet the requirement of vacuum sealing, the air permeability of the first sealing ring 43 and the second sealing ring 44 is not more than 3.6 multiplied by 10-4/Pa·L·cm-1·s-1The air output rate is not more than 3.5 multiplied by 10-4Pa·L·cm-2·s-1Can meet the requirement of 10 degrees of vacuum-5-10-7And (4) normally using under a Pa condition.
This structure completes the separation of the dipolar iron vacuum chamber 3, i.e., the main accelerator vacuum system, from the release film storage chamber 1 vacuum system. Through simulation and test analysis, when the vacuum environment of the main accelerator is damaged, the vacuum degree of the stripping membrane system is 30min later, and the stripping membrane system is in the original state of 1e10-5Pa is reduced to 0 Pa. During the period, the operators can have enough time to carry out emergency repair work, the main work comprises the steps of separating the leakage opening position of the accelerator device from the main accelerator system, moving the membrane clamping assembly 41 back to the initial position, separating the stripping membrane system from the main accelerator system, and then completing the problem solution of the fault position. The light protection device protects the spare carbon film of the storage chamber, so that the system can be restored only by replacing the damaged carbon film (the carbon film originally inserted into the dipolar iron vacuum chamber).
Claims (9)
1. A sealing transmission rod for self-sealing protection of a stripping film of a storage chamber of a heavy ion accelerator is characterized in that the front end of the transmission rod (5) is connected with a membrane clamping assembly (41) for replacing the stripping film, the transmission rod (5) is positioned behind the membrane clamping assembly (41) and is connected with a sealing assembly (4), when the front end of the transmission rod (5) extends into a dipolar iron vacuum chamber (3), the sealing assembly (4) is positioned in a dipolar iron vacuum pipeline (2) of a synchrotron, one end of the dipolar iron vacuum pipeline (2) is communicated with the dipolar iron vacuum chamber (3), and the other end of the dipolar iron vacuum pipeline is communicated with a storage chamber (1) of the stripping film; the sealing assembly (4) is used for sealing and separating the dipolar iron vacuum pipelines (2) on the front side and the rear side of the sealing assembly (4), and further separating the dipolar iron vacuum chamber (3) and the stripping film storage chamber (1).
2. The self-sealing protective heavy ion accelerator compartment peel film seal transfer bar of claim 1, wherein the seal assembly (4) comprises a disc-shaped base (42), the base (42) having an inside diameter equal to the outside diameter of the transfer bar (5) and an outside diameter less than the inside diameter of the dipolar iron vacuum conduit (2); the base (42) is fixed on the transmission rod (5), a first sealing ring (43) is arranged on the inner ring of the base (42), and the first sealing ring (43) is used for sealing a gap between the outer circumference of the transmission rod (5) and the inner ring of the base (42); and a second sealing ring (44) is arranged on the outer ring of the base (42), and the second sealing ring (44) is used for sealing a gap between the inner cavity of the dipolar iron vacuum pipeline (2) and the outer ring of the base (42).
3. The self-sealing protective heavy ion accelerator compartment peel film seal transfer bar of claim 2, wherein the first seal (43) comprises at least one and the second seal (44) comprises at least two.
4. The self-sealing protective heavy ion accelerator storage compartment release film seal transfer bar of claim 3, wherein the first seal (43) is an O-ring seal and the second seal (44) is a rectangular seal.
5. The self-sealing protective seal driving rod for the peeling film of the storage room of the heavy ion accelerator according to claim 4, wherein the first sealing ring (43) and the second sealing ring (44) are made of fluororubber.
6. The self-sealing protective seal transfer bar for heavy ion accelerator storage compartment peel film of claim 5, wherein the first seal (43) and the second seal (44) have a gas permeation rate no greater than 3.6×10-4/Pa·L·cm-1·s-1。
7. The self-sealing protective seal transfer bar for heavy ion accelerator storage compartment peel film of claim 6 wherein the first seal (43) and second seal (44) have a vent rate no greater than 3.5 x 10-4Pa·L·cm-2·s-1。
8. The self-sealing protective sealing transmission rod for the stripping film of the storage room of the heavy ion accelerator according to claim 1, wherein the base (42) is made of aluminum alloy.
9. The self-sealing protective sealing transmission rod for the stripping film of the storage room of the heavy ion accelerator as claimed in claim 1, wherein the outer surface of the base (42) is provided with a plurality of screw holes pointing to the axis, a jackscrew (45) is connected in the screw holes, and the base (42) is fixed on the transmission rod (5) through the jackscrew (45).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210340501.9A CN114615787A (en) | 2022-04-02 | 2022-04-02 | Self-sealing protective sealing transmission rod for stripping film of storage chamber of heavy ion accelerator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210340501.9A CN114615787A (en) | 2022-04-02 | 2022-04-02 | Self-sealing protective sealing transmission rod for stripping film of storage chamber of heavy ion accelerator |
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| Publication Number | Publication Date |
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| CN114615787A true CN114615787A (en) | 2022-06-10 |
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| CN202210340501.9A Pending CN114615787A (en) | 2022-04-02 | 2022-04-02 | Self-sealing protective sealing transmission rod for stripping film of storage chamber of heavy ion accelerator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115551169A (en) * | 2022-11-28 | 2022-12-30 | 合肥中科离子医学技术装备有限公司 | Stripping and leading-out device of proton cyclotron |
-
2022
- 2022-04-02 CN CN202210340501.9A patent/CN114615787A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115551169A (en) * | 2022-11-28 | 2022-12-30 | 合肥中科离子医学技术装备有限公司 | Stripping and leading-out device of proton cyclotron |
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