CN103422767A - Pneumatic two-pass shielding shutter - Google Patents
Pneumatic two-pass shielding shutter Download PDFInfo
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- CN103422767A CN103422767A CN2013103214756A CN201310321475A CN103422767A CN 103422767 A CN103422767 A CN 103422767A CN 2013103214756 A CN2013103214756 A CN 2013103214756A CN 201310321475 A CN201310321475 A CN 201310321475A CN 103422767 A CN103422767 A CN 103422767A
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Abstract
The invention relates to a control device for irradiation device irradiation doses, and in order to overcome the defect of a shielding shutter used for controlling the irradiation doses in an existing irradiation device, the invention provides a pneumatic two-pass shielding shutter which comprises an air cylinder, a connecting rod, a shield, a pulley and a slide rail. The air cylinder is a two-pass air cylinder and connected with the shield through the connecting rod to drive the shield, the pulley matched with the slide rail is arranged on the shield, and the shield driven by the air cylinder can slide along the slide rail. A shutter opening is formed in the center of the shield, the portions corresponding to other radiation beam outlets, except the shutter opening, of the shield are provided with shielding material, and other parts of the shield are made of material with the density lower than that of the shielding material to form a supporting structure. The pneumatic two-pass shielding shutter has the advantages of being good in stability, high in on-off speed, short in transition time, small in vibration amplitude, good in combination property and suitable for being applied to quantitative control over the irradiation device irradiation doses.
Description
Technical field
The present invention relates to a kind of control device of irradiation devices exposure dose, particularly a kind of pneumatic two-pass shielding shutter.
Background technology
Irradiation devices, when specific irradiation object is irradiated, usually need quantitatively to control exposure dose (irradiation time).For radioactive source, owing to itself continuing to provide radiant output, therefore must, by additional method, output be controlled.And for X-ray production apparatus or radiation from machine source, although can control exposure dose by the break-make of high pressure or line, but also can there be longer transition region in this control in general, dosage in transition region is to increase gradually or reduce gradually, if now total exposure dose is larger, transition dosage can be ignored for the impact of accumulated dose so, if but total dosage is less, transition dosage is just very obvious for the contribution of accumulated dose, naturally also can accurately control and bring very large impact dosage.Therefore, a lot of irradiation devices all need additionally to add one for controlling the shielding shutter of exposure dose, and irradiation time (being exposure dose) is controlled accurately.
At present, for the shielding shutter of controlling exposure dose, mainly contain three kinds, be respectively the shielding shutter of motor-driven shielding shutter, solenoid-driven and the shielding shutter of air cylinder driven.
Motor-driven shielding shutter main feature is to select arbitrarily stroke, and can increase driving force by the mode that changes moment, and the weight of shutter shield not have to limit substantially.But also there is obvious deficiency in motor-driven shielding shutter, be mainly that it needs the time of growing in switching process, the transit time that namely shields shutter is partially long, for the control of short time, transit time, proportion was bigger than normal, had a strong impact on the accuracy that dosage is controlled.
The shielding shutter of solenoid-driven is controlled the switch of shielding shutter by the adhesive of electromagnet, main feature is its quick action, generally in a few tens of milliseconds magnitude.But the shielding shutter of solenoid-driven drives stroke shorter, and the gross weight of its driving is lower, therefore often is difficult to meet the needs of practical application.
The shielding shutter of air cylinder driven is used comparatively extensive at present, adopts the one-stroke air cylinder driven, and its main feature is quick action, and transit time is short.But it is less stable in use, if the large powerful cylinder of use that just needs of driven component weight, vibration amplitude during corresponding cylinder operation also will strengthen.
In sum, the shielding shutter had now for controlling exposure dose all exists weak point in concrete application, therefore when realizing the irradiation devices short irradiation to the accurate control of exposure dose, and guarantee good combination property simultaneously, need to develop the shielding shutter that a kind of transit time is short, stability is high, vibration amplitude is little.
Summary of the invention
For solving in existing irradiation devices for controlling the shielding shutter above shortcomings of exposure dose, improve its combination property, enable to possess short, the advantage such as stability is high, vibration amplitude is little transit time simultaneously, the invention provides a kind of pneumatic two-pass shielding shutter.
This shielding shutter comprises cylinder, connecting rod, shield, pulley and slide rail; Described cylinder is double stroke cylinder, and cylinder is connected with shield with the driven shield body by connecting rod; Shield is provided with the pulley matched with slide rail, and shield can slide along slide rail under the driving of cylinder; Described shield central authorities are provided with fast door opening, and on shield, except fast door opening, other exports corresponding part with radiation beam and is provided with shielding material, the shield remainder adopt density lower than the material of shielding material to form braced structures.
Described shielding material is preferably lead.
The material of described braced structures is preferably stainless steel.
Connecting rod is preferably bolt with the connected mode of shield and is connected.
Pneumatic two-pass shielding shutter of the present invention adopts double stroke cylinder, this kind of cylinder carries out propelling and the withdrawal of two-part when work, the mode of operation of shielding shutter is become to " oco-pass " pattern by " on-off " pattern of original one-stroke air cylinder driven, that is: open the shielding shutter after first stroke of releasing at cylinder, after second stroke that cylinder is released, close the shielding shutter; Open the shielding shutter after first stroke retracted at cylinder, after second stroke that cylinder retracts, close the shielding shutter.
When selecting air pump to be inflated the double stroke cylinder of shielding shutter, the gas once be filled with can meet the needs of the shielding shutter switching of two strokes, such mode of operation stability will be significantly better than the shielding shutter that adopts the one-stroke cylinder, and break-make speed is fast, transit time is short, and vibration amplitude is little.
Main cause is: when being irradiated, often need to irradiate the specific time, therefore need to be controlled the shutter opening time, when using the shielding shutter that adopts the one-stroke cylinder, tend to the situation that occurs that the shielding shutter is not opened, main cause is not normal operation of cylinder, makes experiment again to clock; If select two-pass shielding shutter, particularly use its second stroke, the switching of shielding shutter is irrelevant with the inflation of cylinder.
In addition, because the double stroke cylinder of same size is more smaller than one-stroke cylinder motive force, and the shutter release speed of air cylinder driven has certain relation with the weight of shield, easily cause the increase of transit time, for addressing this problem, the present invention partly changes the material preparation lower than shielding material by density by braced structures not corresponding with the radiation beam outlet on shield.
In sum, the advantage such as pneumatic two-pass shielding shutter of the present invention has good stability concurrently, and break-make speed is fast, and transit time is short, and vibration amplitude is little, practical application shows that its combination property is good, is suitable for the application in the irradiation devices exposure dose is quantitatively controlled.
The accompanying drawing explanation
Fig. 1 pneumatic two-pass shielding shutter structure schematic diagram of the present invention
Fig. 2 pneumatic two-pass shielding shutter course of work schematic diagram of the present invention
Reference numeral: 1. radiation beam outlet, 2. slide rail, 4. fast door opening, 5. braced structures, 6. connecting rod, 7. cylinder, 8. shielding material, 9. pulley, 10. cylinder one Room, 11. cylinder two Room.
In Fig. 2: the A. original state, the B. cylinder is released the first stroke, and the C. cylinder is released the second stroke, and the D. cylinder retracts the first stroke, and the E. cylinder retracts the second stroke, gets back to original state.
The specific embodiment
Below in conjunction with accompanying drawing, embodiments of the present invention are described further.
Embodiment
A kind of pneumatic two-pass shielding shutter, comprise cylinder, connecting rod, shield, pulley and slide rail; Described cylinder is double stroke cylinder, and cylinder is connected with shield with the driven shield body by connecting rod; Shield is provided with the pulley matched with slide rail, and shield can slide along slide rail under the driving of cylinder; Described shield central authorities are provided with fast door opening, and on shield, except fast door opening, other exports corresponding part with radiation beam and is provided with shielding material, the shield remainder adopt density lower than the material of shielding material to form braced structures.Described shielding material is plumbous; The material of described braced structures is stainless steel; Connecting rod and shield are with bolts.
Pneumatic two-pass shielding shutter of the present invention has been carried out to shield effectiveness test and transit time to irradiating the Dose Effect test, and measurement result is listed in respectively table 1 and table 2.
Table 1
Table 2
| Radiation quality | Average energy keV | 200s irradiation dose theoretical value mGy | X-ray machine is controlled mGy switch time | With the theoretical value relative deviation | Shutter control mGy | With the theoretical value relative deviation |
| N-250 | 208 | 1.000 | 0.981 | 1.9% | 1.004 | 0.4% |
Claims (4)
1. a pneumatic two-pass shielding shutter, comprise cylinder, connecting rod, shield, pulley and slide rail, and it is characterized in that: described cylinder is double stroke cylinder, and cylinder is connected with shield with the driven shield body by connecting rod; Shield is provided with the pulley matched with slide rail, and shield can slide along slide rail under the driving of cylinder; Described shield central authorities are provided with fast door opening, and on shield, except fast door opening, other exports corresponding part with radiation beam and is provided with shielding material, the shield remainder adopt density lower than the material of shielding material to form braced structures.
2. pneumatic two-pass as claimed in claim 1 shields shutter, it is characterized in that: described shielding material is for plumbous.
3. pneumatic two-pass as claimed in claim 1 shields shutter, and it is characterized in that: the material of described braced structures is stainless steel.
4. pneumatic two-pass as claimed in claim 1 shields shutter, and it is characterized in that: connecting rod is that bolt is connected with the connected mode of shield.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310321475.6A CN103422767B (en) | 2013-07-29 | 2013-07-29 | A kind of pneumatic two-pass shielding shutter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310321475.6A CN103422767B (en) | 2013-07-29 | 2013-07-29 | A kind of pneumatic two-pass shielding shutter |
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| Publication Number | Publication Date |
|---|---|
| CN103422767A true CN103422767A (en) | 2013-12-04 |
| CN103422767B CN103422767B (en) | 2016-06-29 |
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| CN201310321475.6A Active CN103422767B (en) | 2013-07-29 | 2013-07-29 | A kind of pneumatic two-pass shielding shutter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108166906A (en) * | 2018-01-22 | 2018-06-15 | 倪菁菁 | A kind of dept. of radiology's Medical anti-radiation controllable type separation layer |
| CN110010261A (en) * | 2019-04-15 | 2019-07-12 | 中国原子能科学研究院 | A kind of speed radiation shielding shutter |
Citations (6)
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| CN1333462A (en) * | 2001-09-03 | 2002-01-30 | 北京埃索特核电子机械有限公司 | Equipment of cobalt 60 gamma ray source-cesium iodide or cadmium tungstate detector for checking container |
| JP2002266811A (en) * | 2001-03-05 | 2002-09-18 | Rigaku Industrial Co | Pneumatic cylinder for vacuum chamber and x-ray analizer using the same |
| CN1401996A (en) * | 2002-09-23 | 2003-03-12 | 清华大学 | Gamma-ray radiation source device for vehicle-mounted container inspecting system |
| WO2007133501A2 (en) * | 2006-05-09 | 2007-11-22 | Millennium Cell, Inc. | Fixed-bed reactors and catalytic processes |
| CN102779564A (en) * | 2012-07-26 | 2012-11-14 | 清华大学 | Radiation source device for radiation imaging system |
| CN203462899U (en) * | 2013-07-29 | 2014-03-05 | 中国原子能科学研究院 | Pneumatic double-stroke shielding shutter |
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2013
- 2013-07-29 CN CN201310321475.6A patent/CN103422767B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002266811A (en) * | 2001-03-05 | 2002-09-18 | Rigaku Industrial Co | Pneumatic cylinder for vacuum chamber and x-ray analizer using the same |
| CN1333462A (en) * | 2001-09-03 | 2002-01-30 | 北京埃索特核电子机械有限公司 | Equipment of cobalt 60 gamma ray source-cesium iodide or cadmium tungstate detector for checking container |
| CN1401996A (en) * | 2002-09-23 | 2003-03-12 | 清华大学 | Gamma-ray radiation source device for vehicle-mounted container inspecting system |
| WO2007133501A2 (en) * | 2006-05-09 | 2007-11-22 | Millennium Cell, Inc. | Fixed-bed reactors and catalytic processes |
| CN102779564A (en) * | 2012-07-26 | 2012-11-14 | 清华大学 | Radiation source device for radiation imaging system |
| CN203462899U (en) * | 2013-07-29 | 2014-03-05 | 中国原子能科学研究院 | Pneumatic double-stroke shielding shutter |
Non-Patent Citations (1)
| Title |
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| 吴碧金等: "双行程集成气缸的设计及动态特性研究", 《集美大学学报（自然科学版）》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108166906A (en) * | 2018-01-22 | 2018-06-15 | 倪菁菁 | A kind of dept. of radiology's Medical anti-radiation controllable type separation layer |
| CN110010261A (en) * | 2019-04-15 | 2019-07-12 | 中国原子能科学研究院 | A kind of speed radiation shielding shutter |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103422767B (en) | 2016-06-29 |
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