CN104444944B - A kind of radiographic source elevating mechanism and there is its X-ray detection device for foreign matter - Google Patents
A kind of radiographic source elevating mechanism and there is its X-ray detection device for foreign matter Download PDFInfo
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- CN104444944B CN104444944B CN201410839255.7A CN201410839255A CN104444944B CN 104444944 B CN104444944 B CN 104444944B CN 201410839255 A CN201410839255 A CN 201410839255A CN 104444944 B CN104444944 B CN 104444944B
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- synchronous belt
- belt wheel
- lead screw
- lifting plate
- fixed
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- 230000007246 mechanism Effects 0.000 title claims abstract description 46
- 238000001514 detection method Methods 0.000 title claims abstract description 23
- 230000003028 elevating effect Effects 0.000 title claims abstract description 10
- 230000001360 synchronised effect Effects 0.000 claims description 40
- 230000005855 radiation Effects 0.000 claims description 24
- 230000005540 biological transmission Effects 0.000 claims description 12
- 239000000758 substrate Substances 0.000 claims description 5
- 230000000694 effects Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 6
- 238000006073 displacement reaction Methods 0.000 description 5
- 238000003384 imaging method Methods 0.000 description 5
- 230000000670 limiting effect Effects 0.000 description 5
- 230000008859 change Effects 0.000 description 3
- 230000003321 amplification Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F7/00—Lifting frames, e.g. for lifting vehicles; Platform lifts
- B66F7/10—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported directly by jacks
- B66F7/12—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported directly by jacks by mechanical jacks
- B66F7/14—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported directly by jacks by mechanical jacks screw operated
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F7/00—Lifting frames, e.g. for lifting vehicles; Platform lifts
- B66F7/28—Constructional details, e.g. end stops, pivoting supporting members, sliding runners adjustable to load dimensions
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
- G01N23/04—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Analysing Materials By The Use Of Radiation (AREA)
Abstract
The open a kind of radiographic source elevating mechanism of the present invention, including driving motor, lifter plate, guiding mechanism, lead-screw drive mechanism, radiographic source is fixed on lifter plate, the uniform guiding mechanism making lifter plate to move up and down in the corner of described lifter plate, described driving motor drives lead-screw drive mechanism, and lifter plate connects lead-screw drive mechanism.Invention additionally discloses a kind of X-ray detection device for foreign matter with above-mentioned radiographic source elevating mechanism.It is an advantage of the current invention that: by adjusting radiogenic height in real time so that the resolution of system does not changes along with the thickness difference of object, remains optimal resolution, reaches accurately to detect the effect of foreign body.
Description
Technical Field
The invention relates to the technical field of foreign matter detection, in particular to a ray source lifting mechanism and an X-ray foreign matter detection device with the same.
Background
The working principle of the X-ray foreign matter detector is as follows: foreign matters with high density such as metal, glass, stones and the like mixed in the bulk materials are detected by utilizing different penetration characteristics of X-rays to different substances, and then are removed by a removing device.
The positions of a ray source and a detector of the current X-ray equipment are generally fixed, the height of the ray source is basically determined by the width of an object to be irradiated, and the detector is generally arranged below a transmission belt, so that when objects with different thicknesses pass through the equipment, the actual resolution (amplification) rate of the system is changed and cannot be ensured to be close to an optimal value.
Disclosure of Invention
One of the technical problems to be solved by the present invention is to provide a radiation source lifting mechanism that ensures that the resolution of the system does not change with the thickness of the object.
The second technical problem to be solved by the present invention is to provide an X-ray foreign object detection device having the above-mentioned radiation source elevating mechanism.
The invention adopts the following technical scheme to solve one of the technical problems: the utility model provides a ray source elevating system, includes driving motor, lifter plate, guiding mechanism, screw drive mechanism, and the ray source is fixed on the lifter plate, the four corners equipartition of lifter plate makes the guiding mechanism that the lifter plate can only reciprocate, driving motor drive screw drive mechanism, lifter plate connection screw drive mechanism.
As an optimized technical scheme, two groups of screw rod transmission mechanisms are respectively and symmetrically arranged on two sides of the lifting plate, and all parameters of the two groups of sliding screw rods which are symmetrically arranged are completely consistent.
As an optimized technical scheme, the lifting mechanism further comprises a first synchronous belt pulley, a first synchronous belt, a second synchronous belt pulley, a second synchronous belt and a third synchronous belt pulley, each group of screw rod transmission mechanisms comprises a sliding screw rod and a nut, a through hole is formed in the position, corresponding to the sliding screw rod, of the lifting plate, the nut and the through hole are coaxially fixed on the lifting plate, the lower portion of the sliding screw rod is fixed on a thrust bearing, the thrust bearing is fixed on a base plate of the X-ray foreign matter detection device, the first synchronous belt pulley is fastened on an output shaft of a driving motor, the second synchronous belt pulley and the third synchronous belt pulley are fastened on the lower portions of the two sliding screw rods respectively, the first synchronous belt pulley and the second synchronous belt pulley are connected through the first synchronous belt, and the second synchronous belt pulley and the third synchronous belt pulley are connected through the second.
As an optimized technical scheme, the driving motor is fixed on a motor support, and the motor support is fixed on the substrate.
The invention adopts the following technical scheme to solve the second technical problem: an X-ray foreign matter detection device comprising the ray source lifting mechanism is provided.
The invention has the advantages that: by adjusting the height of the ray source in real time, the resolution of the system does not change along with the difference of the thickness of the object, the optimal resolution is always kept, and the effect of accurately detecting the foreign matters is achieved.
Drawings
Fig. 1 is a schematic diagram of the principle of X-ray imaging.
Fig. 2 is a schematic diagram of the principle of X-ray imaging after the conveyor belt is added.
Fig. 3 is a schematic structural diagram of a light curtain thickness measuring device according to an embodiment of the present invention and a schematic usage state thereof.
Fig. 4 is a schematic structural diagram of an X-ray source positioning mechanism according to an embodiment of the present invention.
Fig. 5 is a schematic structural diagram of an X-ray source lifting mechanism according to an embodiment of the present invention.
Detailed Description
The present invention is described in detail below with reference to the attached drawings.
As shown in FIG. 1, the X-ray detection device comprises a radiation source 1 and a detector 2, wherein the radiation source 1 and the detector 2 are respectively positioned above and below a detected object 3, and the system magnification of the X-ray detection device is based on the X-ray imaging theoryIs defined as:
（1）
the distance from the source 1 to the detector 2,is the distance from the radiation source 1 to the height center of the object 3.
As a further refinement, the object 3 is conveyed by a conveyor belt 4, as shown in FIG. 2, at which time the magnification is increasedComprises the following steps:
（2）
wherein,the distance from the radiation source 1 to the conveyor belt 4,the distance of the conveyor belt 4 from the detector 2,is the thickness of the test object 3.
The present science has demonstrated that the optimum magnification(to optimize object imaging quality) is:
（3）
wherein,is the size of the focal spot of the radiation source 1,the resolution of the detector 2.
For an X-ray examination apparatus,andare fixed, i.e. the optimal magnification of the system is constant.
In order to solve the problem that the resolution of the existing system changes according to the thickness of the object 3, according to the aforementioned theory, the applicant proposes a scheme to adjust the height of the radiation source 1 (keep the position of the detector 2 unchanged) in real time according to the thickness of the object 3, so that the actual system magnification reaches or approaches the optimal magnification to the maximum extent.
Order to
Then（4）
When the apparatus is empty, the initial distance from the radiation source 1 to the conveyor belt 4Comprises the following steps:
（5）
the distance setting mentioned above presupposes that a radiation source 1 of a suitable divergence angle is selected to ensure a detection width.
Obviously, when the thickness isWhen the object 3 is detected by the X-ray detection device, the position of the radiation source 1 changesComprises the following steps:
（6）
a negative value indicates that the position of the radiation source 1 is elevated.
Based on the above analysis, please refer to fig. 3 and 4 together, the X-ray foreign object detection apparatus with the best resolution provided by the applicant includes a radiation source 10, a detector (not shown), a conveyor belt 30, a thickness measuring device 40, an upper computer (not shown), a driving motor 50, and a lifting mechanism 60.
The measured object 80 conveys on conveyer belt 30, radiation source 10 is located the top of conveyer belt 30, fixes on elevating system 60, and the detector is located the below of conveyer belt 30, receives the signal that radiation source 10 sent, and driving motor 50 and elevating system 60 are installed on X ray foreign matter detection device's base plate 70, thickness measuring device sets up on the conveyer belt 30 both sides of X ray foreign matter detection device's entrance, the host computer with thickness measuring device 40 reaches driving motor 50 connects, and driving motor 50 drives elevating system 60.
Specifically, the thickness measuring device 40 is a light curtain measuring device, and includes a set of photo-emitters 42 and receivers 44 disposed opposite to each other, the photo-emitters 42 and the receivers 44 are fixed on the conveyor belt support 32, and the receivers 44 are configured to receive signals generated by the photo-emitters 42, so as to obtain the thickness of the object 80 to be measured.
Of course, multiple sets of photoemitters 42 and receivers 44 can be provided on either side of the belt 30, as desired.
The light emitted from the photoemitters 42 is equally spaced, with the minimum spacing being the measurement accuracy. When no object 80 passes between the photoemitter 42 and the receiver 44, the receiver 44 receives the optical signal transmitted by the photoemitter 42 completely. When the object 80 passes between them, part of the light is blocked by the object 80, and the receiver 44 only receives the unblocked light. The receiver 44 calculates the number of the blocked light rays, multiplies the distance of the light rays to obtain the height of the measured object, and uploads the height parameter to the upper computer.
The upper computer obtains the thickness parameter of the measured object 80Then, the displacement of the radiation source 10 relative to the current position can be determined according to the calculation formula (6) of the position change of the radiation source.
The driving motor 50 may be fixed on an X-ray foreign object detection device, such as a substrate 70 of the X-ray foreign object detection device, or may be fixed at another position convenient for operation, and an opening for allowing the X-ray beam 12 generated by the X-ray source 10 to pass through is formed on the substrate 70, and the X-ray beam 12 passes through the opening to reach a detector disposed below the conveyor belt 30, so as to form an image of the object 80 to be detected.
The upper computer sends the calculated displacement parameters to the driving motor 50, and the driving motor 50 drives the lifting mechanism 60 to drive the X-ray source 10 to move up and down, face or be far away from the detector, and finally be in the optimal imaging position.
The driving motor 50 may be a conventional motor, which may be conceived by those skilled in the art without creative efforts and will not be described herein.
As a more specific technical solution, as shown in fig. 5, which is a schematic structural diagram of the lifting mechanism 60 of the present invention, the lifting mechanism 60 includes a lifting plate 61, a guide mechanism 62, a screw transmission mechanism 63, a first timing belt 64, a first timing belt 65, a second timing belt 66, a second timing belt 67, and a third timing belt 68.
The X-ray source 10 is fixed on the lifting plate 61, the guide mechanisms 62 are uniformly distributed at four corners of the lifting plate 61, each guide mechanism 62 consists of a guide shaft 622 and a sliding sleeve 624, through holes (not shown) are formed at the four corners of the lifting plate 61, the sliding sleeves 624 are arranged in the through holes, the lower ends of the guide shafts 622 are fixed on the base plate 70 of the X-ray foreign matter detection device, the upper ends of the guide shafts 624 penetrate through the sliding sleeves 624, and the guide mechanisms 62 only enable the lifting plate 61 to move up and down due to the limiting effect of the sliding sleeves 624.
The up-and-down movement of the lifting plate 61 is realized by two sets of screw rod transmission mechanisms 63 symmetrically arranged on two sides of the lifting plate 61, each set of screw rod transmission mechanism 63 includes a sliding screw rod 632 and a nut 634, and each parameter of the two sets of sliding screw rods 632 symmetrically arranged is completely consistent, the lead angle of the sliding screw rod 632 is smaller than the friction angle, and has a self-locking function, a through hole (not shown) is provided at a position of the lifting plate 61 corresponding to the sliding screw rod 632, the nut 634 and the through hole are coaxially fixed on the lifting plate 61, as can be easily understood by a person skilled in the art, the nut 634 may be fixed above the lifting plate 61 or below the lifting plate 61, the lower side of the sliding screw rod 632 is fixed on a thrust bearing 636, and the thrust bearing 636 is fixed on the substrate 70 of the X-ray foreign matter.
The output shaft of the driving motor 50 is fastened with a first synchronous pulley 64, the lower parts of the two sliding screws 632 are respectively fastened with a second synchronous pulley 66 and a third synchronous pulley 68, the first synchronous pulley 64 and the second synchronous pulley 66 are connected by a first synchronous belt 65, the second synchronous pulley 66 and the third synchronous pulley 68 are connected by a second synchronous belt 67, the driving motor 50 rotates to drive the first synchronous pulley 64 to rotate, and further drive the second synchronous pulley 66 and the third synchronous pulley 68 to rotate, so that power is transmitted to the sliding screws 632, and the rotation of the sliding screws 632 drives the lifting plate 61 to lift. The parameters of the two sets of sliding screw 632 symmetrically arranged are completely consistent, so that the lifting amplitudes of the two sides of the lifting plate 61 are completely consistent, and a stable lifting effect is achieved.
The drive motor 50 is fixed to a motor support 52, the motor support 52 is fixed to a base plate 70, and the base plate 70 is provided with an opening through which the X-ray beam 12 generated by the X-ray source 10 passes, and the X-ray beam 12 passes through the opening to reach a detector disposed below the conveyor belt 30, thereby forming an image of the object 80 to be measured.
As an optimized scheme, a light limiting cylinder 69 is installed at a light outlet hole of the X-ray source 10 and used for limiting the width of the X-ray, and the second synchronous belt 67 wraps the light limiting cylinder 69 on the inner side.
The whole X-ray source position self-adjustment comprises the following steps:
step 1, measuring thickness by using a light curtain:
the thickness measuring device 40 as described above can be used as the thickness measuring device for measuring and storing the thickness parameter of the object 80 to be measuredAfter the detection, uploading the data to an upper computer;
step 2, position calculation:
the upper computer obtains the thickness parameter of the measured objectThen, according to the above formula (6) for calculating the position of the radiation source 10, the displacement of the radiation source 10 relative to the current position can be determined;
step 3, positioning is executed:
according to the displacement of the radiation source 10 relative to the current position determined in step 2, the position of the radiation source 10 is adjusted to match the displacement, so as to achieve the purpose of obtaining better resolution, and the position adjustment of the radiation source 10 is realized through the driving motor 50 and the lifting mechanism 60.
The invention can effectively improve the resolution.
The above method is only suitable for the detection of the object 80 having substantially uniform thickness.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the invention, so that any modifications, equivalents, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (3)
1. A ray source elevating system which characterized in that: the X-ray source device comprises a driving motor (50), a lifting plate (61), guide mechanisms (62) and lead screw transmission mechanisms (63), wherein a ray source (10) is fixed on the lifting plate (61), the guide mechanisms (62) which can only move up and down are uniformly distributed at four corners of the lifting plate (61), the driving motor (50) drives the lead screw transmission mechanisms (63), the lifting plate (61) is connected with the lead screw transmission mechanisms (63), the lead screw transmission mechanisms (63) are divided into two groups which are respectively and symmetrically arranged at two sides of the lifting plate (61), parameters of sliding lead screws (632) of the two groups of symmetrically arranged lead screw transmission mechanisms (63) are completely consistent, the lifting mechanism further comprises a first synchronous belt wheel (64), a first synchronous belt (65), a second synchronous belt wheel (66), a second synchronous belt (67) and a third synchronous belt wheel (68), each group of lead screw transmission mechanisms (63) comprises a sliding lead screw (632) and a nut (634), a through hole is formed in the position, corresponding to the sliding lead screw (632), of the lifting plate (61), the nut (634) and the through hole are coaxially fixed on the lifting plate (61), the lower portion of the sliding lead screw (632) is fixed on the thrust bearing (636), the thrust bearing (636) is fixed on a base plate (70) of the X-ray foreign matter detection device, a first synchronous belt wheel (64) is fastened on an output shaft of the driving motor (50), the lower portions of the two sliding lead screws (632) are respectively fastened on a second synchronous belt wheel (66) and a third synchronous belt wheel (68), the first synchronous belt wheel (64) and the second synchronous belt wheel (66) are connected through a first synchronous belt (65), and the second synchronous belt wheel (66) and the third synchronous belt wheel (68) are connected through a second synchronous belt (67).
2. The radiation source lifting mechanism as claimed in claim 1, wherein: the driving motor (50) is fixed on the motor support (52), and the motor support (52) is fixed on a substrate (70) of the X-ray foreign matter detection device.
3. An X-ray foreign matter detection device characterized by comprising the radiation source elevating mechanism according to any one of claims 1 to 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410839255.7A CN104444944B (en) | 2014-12-30 | 2014-12-30 | A kind of radiographic source elevating mechanism and there is its X-ray detection device for foreign matter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410839255.7A CN104444944B (en) | 2014-12-30 | 2014-12-30 | A kind of radiographic source elevating mechanism and there is its X-ray detection device for foreign matter |
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| CN104444944A CN104444944A (en) | 2015-03-25 |
| CN104444944B true CN104444944B (en) | 2016-11-30 |
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| CN105043419B (en) * | 2015-08-04 | 2017-12-19 | 北京控制工程研究所 | A kind of X-ray pulsar navigation sensor on-orbit calibration radiographic source |
| CN105366584B (en) * | 2015-12-10 | 2018-03-23 | 同方威视技术股份有限公司 | Vehicular radiation detection system elevating mechanism and vehicular radiation detection system |
| CN105540490A (en) * | 2016-02-03 | 2016-05-04 | 中国原子能科学研究院 | Jacking device |
| CN107381427A (en) * | 2017-07-20 | 2017-11-24 | 安徽巨自动化装备有限公司 | One kind is accurately positioned hoisting mechanism |
| CN110987973A (en) * | 2019-11-01 | 2020-04-10 | 陕西众策网络科技发展有限公司 | X-ray product quality detection device |
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| CN201191276Y (en) * | 2007-09-06 | 2009-02-04 | 同方威视技术股份有限公司 | Apparatus for detecting contraband article in air-freight service container |
| CN201438181U (en) * | 2009-08-03 | 2010-04-14 | 东莞市科隆威自动化设备有限公司 | Platform carrier for X-ray inspection machines |
| CN101893588A (en) * | 2010-04-27 | 2010-11-24 | 丹东奥龙射线仪器有限公司 | X-ray steel pipe seam detection supporting arm device |
| CN104215648B (en) * | 2013-06-05 | 2016-09-07 | 中国石油天然气股份有限公司 | Automatic positioner for X-ray detecting radiation source |
| CN203715171U (en) * | 2013-11-28 | 2014-07-16 | 江苏大族粤铭激光科技有限公司 | Electric and manual adjustment type lifting device |
| CN204417040U (en) * | 2014-12-30 | 2015-06-24 | 合肥美亚光电技术股份有限公司 | A kind of radiographic source lifting mechanism and there is its X-ray detection device for foreign matter |
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