CN1725237A - Metal bar counting system - Google Patents
Metal bar counting system Download PDFInfo
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- CN1725237A CN1725237A CN 200410070827 CN200410070827A CN1725237A CN 1725237 A CN1725237 A CN 1725237A CN 200410070827 CN200410070827 CN 200410070827 CN 200410070827 A CN200410070827 A CN 200410070827A CN 1725237 A CN1725237 A CN 1725237A
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Abstract
This invention discloses a metal bar counting system composed of an image identifying counting device and a metal bar image camera device connected together, among which, the camera device is composed of a box, camera device and more than one active light source, which radiates the metal bard terminal through the transmission mirror and makes the brightness of bar end surface to be higher than that of the side. The camera device shoots the end part of the bar to get images for identification and counting. This invented active light source radiates the end of the bar from two angles to make the brightness of the end much more brighter than that at the side of the bar.
Description
Technical field
The present invention relates to a kind of number system, be meant especially a kind of by one the cover optical system automatically the metal bar end view is looked like to gather, and by the image of being gathered is handled, the number system that the metal bar on the production line is carried out belongs to computer image recognition technology in real time.
Background technology
Metal bar, for example: stainless steel bars, copper bar material, reinforcing bar etc. all were that unit in bundles and sells with weight in the past.Because the influence of uncertainty exists in the metal bar production run, what all can exist the weight error of certain limit between the metal bar of same specification, if selling, storage, only using with the weight statistics then very inconvenient.This is the mode of unit of account with weight, in fact and be not suitable for metal bar sale, store, use and add up; Because when the use of reality, above-mentioned metal bar is that unit comes number of computations with " root " always.
Because metal bar has plurality of specifications, model, therefore, when its quantity of statistics, can go out the radical of the metal bar under a certain weight simply according to its model, specification and total weight.Though this is a simple method, because the error of bar gauge can cause adopting above-mentioned computing method to obtain numerical value and have bigger error.For example: under a kind of specification, total " root " number of the standard of two tons of reinforcing bars is 200, because the existence of error, in fact, two tons reinforcing bar might be 195, also might be 205.In use, actual needs is received 200 reinforcing bars, and the reinforcing bar of depositing in the warehouse is if with weight be unit of account, and the then actual reinforcing bar of receiving two tons of a bundles might occur that quantity has more or not enough phenomenon.
For the needs of reality, in the sale of metal bar, the process of circulation, be that the quantity that unit calculates it can greatly make things convenient for each links such as producing and selling, storage and use with " root ".So each manufacturing enterprise tends to install additional some mechanical type counting assemblys when producing, be used for the corresponding metal bar is counted.
But because metal bar is one of starting material the most basic in the commercial production, its quantity required can present bigger fluctuating along with social economy's periodic cycle.And generally speaking, mechanical type metal bar counting device can only at the uniform velocity be worked according to certain speed, can not guarantee to produce the counting requirement when the peak; And the mechanical type counting assembly often needs metal bar is piled up to separate and be individual layer, with mechanical count mode, photoelectric counting mode or shooting counting mode it is counted again, could guarantee to have good counting accuracy like this.But this need drop into bigger fund, and outfit is piled up equipment and just can be finished the said counting task.
In order to overcome the deficiency of above-mentioned counting equipment or system, industry is introduced metal bar counting with computer image recognition technology.Specifically be to utilize picture pick-up device to gather the image of metal bar end, then, utilize mode identification technology, the end view of metal bar is looked like to identify, and it is counted.This method is easy, and is easy to implement.But because metal bar can cause in the captured end view picture without piling up, lump together in the end face of metal bar and the metal bar side of tiltedly putting, and can't well discern, and therefore also will cause problems such as counting error is big.In order to add up accurately, the metal bar that still needs to be checked is piled up neatly in advance.It is obvious like this that also to need to be equipped with the equipment of piling up neat to guarantee the metal bar end.Need a large amount of fund inputs on the one hand and will drop into the equipment of piling up, can cause production efficiency to descend because of in production procedure, adding new link on the other hand.
A large-scale metal bar manufacturing and processing enterprise, the annual metal bar of producing is worth and reaches billions of yuans, as long as millesimal error is arranged, then the loss that suffers of enterprise will be up to millions of yuans, and be accurately statistics to increase production link also be the way of attending to one thing and lose sight of another.Therefore, in the face of facing a difficult choice of last number, it is the technical barrier that industry needs to be resolved hurrily that existing metal bar counting device is improved.
Summary of the invention
Technical problem underlying to be solved by this invention provides a kind of metal bar counting system, this system can acquisition characteristics the obvious end view picture of outstanding metal bar, make and utilize the image recognition counting to carry out precise counting metal bar, simultaneously need not increase any metal bar again and pile up equipment, the infusion of financial resources of saving equipment.
The present invention specifically solves above-mentioned technical matters by the following technical solutions:
A kind of metal bar counting system, be interconnected to constitute by image recognition counting assembly and metal bar image capturing device, described image recognition counting assembly is one to be provided with the computing machine of digital image processing apparatus, this computing machine receives the metal bar end view picture of camera head by signal wire transmits, end face to the metal bar in this metal bar end view picture is discerned and is counted, and obtains metal bar quantity in every width of cloth image;
Described metal bar image capturing device comprises at least: casing, camera head and more than one active light source; Described camera head is fixedlyed connected with described casing with the active light source, initiatively light source sees through transmissive mirror irradiation on the described casing respectively and is positioned at metal bar end on the metal bar conveying equipment, and makes the brightness of described metal bar end face be higher than the brightness of described metal bar end sides; The shooting direction of camera head is vertical substantially with the throughput direction of described metal bar; And camera head can see through the end that described transmissive mirror photographs described metal bar; Initiatively the light of the described metal bar of light source directive end and the shooting axis of camera head are an acute angle.
By above-mentioned technical scheme as can be known: the present invention adopts the end of the metal bar that light source initiatively is counted from two angular illumination at least, make the end brightness of metal bar be higher than the brightness of described metal bar side far away, thereby feasible captured with this understanding metal bar image adopts image-recognizing method to count can be very accurate.Simultaneously, employing looks like to discern to the end view of metal bar in the image of being gathered based on the image model identification mode, can be described metal bar layering be handled and be piled up, saved the infusion of financial resources of the equipment of piling up, avoided the increase of unnecessary production link.
Description of drawings
Fig. 1 is a reinforcing bar image capturing device synoptic diagram in one embodiment of the invention;
Fig. 2 is a reinforcing bar image capturing device synoptic diagram in another embodiment of the present invention;
Fig. 3 is a reinforcing bar image capturing device synoptic diagram in further embodiment of this invention;
Fig. 4 is the installing synoptic diagram of casing radiator fan of the present invention;
Fig. 5 is positioned at synoptic diagram on the carrier chain for reinforcing bar;
Fig. 6 is used to block the synoptic diagram that the baffle plate of carrier chain is connected with conveying equipment for the present invention;
Fig. 7 is used to flatten the structural scheme of mechanism of carrier chain for the present invention one;
Another is used to flatten the structural scheme of mechanism of carrier chain to Fig. 8 for the present invention.
Embodiment
The present invention is described in further detail below in conjunction with accompanying drawing and specific embodiment:
Metal bar counting system of the present invention is interconnected to constitute by metal bar image capturing device and image recognition counting assembly; The metal bar image capturing device is decided the compartment of terrain basically and is taken the metal bar end view picture that is positioned on the metal bar conveying equipment, and send this image to the image recognition counting assembly, after the image recognition counting assembly receives described image, this image is discerned processing, the end face number of metal bar in the image is counted.
Referring to Fig. 1, in the present embodiment, described metal bar image capturing device comprises at least: casing 11, camera head 6 and two active light sources 100; Camera head 6 and active light source 100 are fixed on the inside of casing, and transmissive mirror 9,9A and transmissive mirror 10 are housed on the casing; Initiatively light source 100 sees through the transmissive mirror 9 on the described casing, the end that the 9A irradiation is positioned at the metal bar 13 on the metal bar conveying equipment respectively.The shooting direction of camera head 6 is vertical substantially with the throughput direction of described metal bar 13, and sees through the end that described transmissive mirror 10 photographs described metal bar 13; The light of the described metal bar of active light source 100 directives 13 ends and the shooting direction of camera head 6 are one and are not more than 30 acute angles of spending.In order to obtain good metal bar end view picture, pass through identification metal bar end face wherein with convenient follow-up computing machine, reach the purpose that metal bar is counted, among the present invention, adopt two or more active light sources 100 from different perspectives the end of described metal bar to be shone.With the present embodiment is example, and the benefit of doing like this is: when active light source 100 shone the end of described metal bar from different perspectives, the brightness of the end face of metal bar was the result by the common irradiation of two active light sources, so its brightness is the highest; And other sides of metal bar are only by initiatively light source 100 irradiations, so its brightness is darker relatively.Take in the case, can obtain the outstanding image of end face brightness, handle thereby greatly facilitate follow-up identification.
Above-mentioned active light source 100 is made up of luminophor 1 and collector lens 2 at least, luminophor 1 be located substantially on collector lens 2 a focus near, and be fixedly installed on the inside of casing 11, the light that this luminophor 1 is sent can see through the end that the transmissive mirror 9 that is located on the casing 11 shines described metal bar 13 behind described collector lens 2 optically focused.
Referring to Fig. 2, because luminophor 1 can produce a lot of heats in working order down, therefore, should make luminophor 1, with the normal working temperature of the heat effects camera head 6 of avoiding its generation as much as possible away from camera head 6.For this reason, described luminophor 1 can be arranged in the casing 11 position far away apart from camera head 6.In order to guarantee that the light that it sent behind luminophor 1 position change can also shine on the end face of metal bar, need between collector lens 2 and transmissive mirror 9, set up a reflective mirror 5, the position of this reflective mirror 5 is arranged on casing 11 inside, and make light that described luminophor 1 sent behind described collector lens 2 optically focused, shine on the described reflective mirror 5, through these reflective mirror 5 reflection commutations, the light that luminophor 1 is sent sees through the end that the transmissive mirror 9 that is located on the casing 11 shines described metal bar 13.
Because luminophor 1 can produce a large amount of heats in working order the time, if untimely heat radiation then can influence the work of miscellaneous part in the casing.For this reason, be provided with the heating radiator 3 of fin on its surface of active light source 100 arranged outside that described luminophor 1, collector lens 2 are constituted, and, in position heating radiator cooling fan 4 is set near heating radiator 3, this heating radiator cooling fan 4 directly blows cooling air to the outside surface of described heating radiator 3, the heat on heating radiator 3 surfaces is taken away by cooling air, reached purpose 100 heat radiations of active light source.
Referring to Fig. 3, in order to solve the heat dissipation problem of luminophor 1 better, the active light source of being made up of luminophor 1 and collector lens 2 100 can be arranged on the outside of casing 11, and this active light source 100 is fixedlyed connected with described casing 11, and, be provided with reflective mirror 5 in casing 11 internal fixation, this reflective mirror 5 is between the collector lens 2 and transmissive mirror 9 of active light source 100, make light that this luminophor 1 sent behind described collector lens 2 optically focused, shine on the described reflective mirror 5, through these reflective mirror 5 reflection commutations, the light that luminophor 1 is sent sees through the end that the transmissive mirror 9 that is located on the casing 11 shines described metal bar 13.
The outside at above-mentioned active light source 100 can be provided with heating radiator 3 equally, identical with embodiment 1, at the outer setting cooling fan 4 of heating radiator 3, the outside surface of this heating radiator 3 is provided with more than one fin, is used for the heat that described active light source 100 distributes is dispelled the heat; And cooling fan 4 is arranged on the outside of casing 11, and described heating radiator 3 is cooled off.Compare with the above embodiments 1, the advantage of present embodiment is: 100 heat radiations are what to carry out in the outside of casing 11 to the active light source, and therefore the effect of heat radiation is even more ideal.
Referring to Fig. 4, on the basis of two above-mentioned embodiment, for each parts that is operated in casing 11 inside are dispelled the heat, can on casing 11, offer air intake opening and exhausr port, and be provided with supply fan 20 at the air intake opening place; The effect of this supply fan 20 is to make casing 11 air outside enter casing 11 inside, and flows out from exhausr port, so that each parts of its inside are cooled off.
In order to prevent that dust in casing 11 extraneous airs is to the pollution of inner each optical device of casing 11, and then the image effect of influence shooting, can also do sealing setting to casing 11, set up filtration 21 at described air intake opening simultaneously, be used for the air that enters in the casing 11 is filtered.
Be subjected to covering of dust in the air in order to prevent to be installed in transmissive mirror 9,10 on the casing 11 etc., above-mentioned exhausr port can be located at the position of casing 11 near transmissive mirror 9,10, and be provided with air exchange fan 22 in exhaust ports, this air exchange fan 22 directly blows to the pure air in the casing 11 outside of described transmissive mirror 9,10, be used to prevent the sticking outside of dropping on transmissive mirror 9,10 of dust, simultaneously, form the exchange of casing 11 inside and outside air.
Referring to Fig. 1,2,3, among each above-mentioned embodiment, in casing 11, exist the light that is sent by active light source 100, these light are a kind of stray light for camera head 6, if this stray light is not eliminated, can make actual photographed image cause interference, make the image blurring of acquisition, and then the effect of influence identification; Therefore, these stray lights need be blocked, make its shooting not constitute influence camera head.For this reason, in the present invention, from the taking lens 7 of described camera head 6 to the cone 8 that is provided for blocking stray light the transmissive mirror of described casing 11.
Referring to Fig. 5, on the production line of reality, metal bar 13 is directly to be placed on the carrier chain 12 of conveying equipment 14, therefore, when the active light source 100 in adopting the present invention shines metal bars 13, the side of this carrier chain 12 also can be illuminated, like this, and in the image of captured metal bar 13 ends, the image of carrier chain 12 also can clearly exist, obviously, this can cause identification and seriously influence, and makes the result of counting bigger error occur.Referring to Fig. 6, the way that solves is: be provided with the baffle plate 15 that is used to block carrier chain 12 at metal bar conveying equipment 14 towards a side of camera head 6, this baffle plate 15 is one with the plane that is positioned at metal bar 13 places on the carrier chain 12 and is not more than 60 angles of spending, its outside surface is made non-reflecting surface, for example, be painted with black or make etc. with heat-resisting light absorbent; And the end face that described metal bar 13 is taken stretches out the side of described baffle plate 15 towards camera head.Like this, when taking, carrier chain 12 is blocked by baffle plate 15, therefore, only remains with the end view drawing picture of metal bar 13 in the captured image.Littler for the influence of carrier chain 12 in the image that makes shooting, the light that can also make described active light source 100 irradiation metal bar ends and described metal bar 13 coexist a plane or and plane, metal bar place between have one and be not more than 20 acute angles of spending.
Because the production of metal bar 13 has continuity, therefore, want to metal bar 13 countings accurately must make between captured per two adjacent images not have interruption, from concrete realization, should make in per two the adjacent images that are taken all to have overlapped part.For this reason, need make camera head 6 decide the compartment of terrain according to the speed of carrier chain operation takes.In the present embodiment, on metal bar conveying equipment 14, be provided with and carrier chain 12 travelling speed and the synchronous coded disc counting device of traffic direction, this coded disc counting device is used for deciding the compartment of terrain according to the move distance of carrier chain 12 and sends the shooting signal to described camera head 6, makes in per two the adjacent images that are taken all to have overlapped part.
On the production line of reality, each chain link on the carrier chain 12 is because long-play, may there be not active phenomenon mutually, can form the phenomenon of chain link projection thus, if this projection is photographed, the accuracy of counting can be influenced equally, for this reason, the mechanism of carrier chain 12 can be on metal bar conveying equipment 14, be provided for forcing to flatten.Referring to Fig. 7,8, its two embodiments for realizing carrier chain 12 is forced pressing.
On the production line of reality, each chain link on the carrier chain 12 is because long-play, may there be not active phenomenon mutually, can form the phenomenon of chain link projection thus, if this projection is photographed, the accuracy of counting can be influenced equally, for this reason, the mechanism of carrier chain 12 can be on reinforcing bar conveying equipment 14, be provided for forcing to flatten.Referring to Fig. 7,8, its two embodiments for realizing carrier chain 12 is forced pressing.Wherein, Figure 7 shows that a kind of mechanism's example of forcing to flatten carrier chain 12, this mechanism is made of bearing 16,17 on axle, and axle 17 is arranged on the key way of conveying equipment, and the outside of bearing 16 is arranged with axle and becomes sheath 18, bearing sheath 18 is compressed on the carrier chain carrier bar 19, when the chain link projection partly arrived the position at bearing 16 and bearing sheath 18 places, this lug boss can be subjected to the compacting of bearing 16 and bearing sheath 18, and becomes straight, therefore, camera head can not photograph the part of chain link projection again.Figure 8 shows that described pressure flattens another example of the mechanism of carrier chain 12, this mechanism is made of bearing 16,17 on axle equally, axle 17 is arranged on the key way of conveying equipment, the outside of bearing 16 is arranged with axle and becomes sheath 18, different is that bearing sheath 18 is compressed on the carrier chain chain barrel 20, when the chain link projection partly arrives the position at bearing 16 and bearing sheath 18 places, the chain barrel 20 of this lug boss correspondence can be subjected to the compacting of bearing 16 and bearing sheath 18, therefore, camera head can not photograph the part of chain link projection again.
It should be noted that at last: above embodiment only in order to the explanation the present invention and and unrestricted technical scheme described in the invention; Therefore, although this instructions has been described in detail the present invention with reference to each above-mentioned embodiment,, those of ordinary skill in the art should be appreciated that still and can make amendment or be equal to replacement the present invention; And all do not break away from the technical scheme and the improvement thereof of the spirit and scope of the present invention, and it all should be encompassed in the middle of the claim scope of the present invention.
Claims (15)
1, a kind of metal bar counting system, be interconnected to constitute by image recognition counting assembly and metal bar image capturing device, described image recognition counting assembly is one to be provided with the computing machine of digital image processing apparatus, this computing machine receives the metal bar end view picture of camera head by signal wire transmits, end face to the metal bar in this metal bar end view picture is discerned and is counted, and obtains metal bar quantity in every width of cloth image; It is characterized in that:
Described metal bar image capturing device comprises at least: casing, camera head and more than one active light source; Described camera head is fixedlyed connected with described casing with the active light source, initiatively light source sees through transmissive mirror irradiation on the described casing respectively and is positioned at metal bar end on the metal bar conveying equipment, and makes the brightness of described metal bar end face be higher than the brightness of described metal bar end sides; The shooting direction of camera head is vertical substantially with the throughput direction of described metal bar; And camera head can see through the end that described transmissive mirror photographs described metal bar; Initiatively the light of the described metal bar of light source directive end and the shooting axis of camera head are an acute angle.
2, metal bar counting system according to claim 1, it is characterized in that: described active light source is made up of luminophor and collector lens at least, and be fixedly installed on the inside of casing, the light that this luminophor sent sees through the end that the transmissive mirror that is located on the casing shines described metal bar behind described collector lens optically focused.
3, metal bar counting system according to claim 2, it is characterized in that: be fixed with reflective mirror at box house, this reflective mirror is between the collector lens and transmissive mirror of active light source, the light that described luminophor sent is behind described collector lens optically focused, shine on the described reflective mirror, through this reflective mirror reflection commutation, the light that luminophor is sent sees through the end that the transmissive mirror that is located on the casing shines described metal bar.
4, according to claim 2 or 3 described metal bar counting systems, it is characterized in that: the described active light source outside is provided with heating radiator, heating radiator cooling fan, the outside surface of this heating radiator is provided with more than one fin, the heating radiator cooling fan directly blows cooling air to described heating radiator, and it is dispelled the heat.
5, metal bar counting system according to claim 1, it is characterized in that: described active light source is made up of luminophor and collector lens at least, fixedly connected with described casing from the outside of casing, and, be fixed with reflective mirror at box house, this reflective mirror is between collector lens and transmissive mirror, the light that this luminophor sent is behind described collector lens optically focused, shine on the described reflective mirror, through this reflective mirror reflection commutation, the light that luminophor is sent sees through the end that the transmissive mirror that is located on the casing shines described metal bar.
6, metal bar counting system according to claim 5, it is characterized in that: the described active light source outside is provided with heating radiator, cooling fan, the outside surface of this heating radiator is provided with more than one fin, is used for the heat that described active light source distributes is dispelled the heat; Described cooling fan is arranged on the outside of casing, and described heating radiator is cooled off.
7, metal bar counting system according to claim 1, it is characterized in that: offer air intake opening and exhausr port on the described casing, air intake opening place at described casing is provided with supply fan, makes the casing air outside enter box house, and each parts of its inside are cooled off.
8, metal bar counting system according to claim 7 is characterized in that: described casing is done sealing and is provided with, to prevent that dust in the casing extraneous air is to the pollution of each optical device in the casing; The place is provided with filtration at described air intake opening, is used for the air that enters in the casing is filtered.
9, metal bar counting system according to claim 8, it is characterized in that: described exhausr port is located at the position of casing near transmissive mirror, this exhaust ports is provided with the air exchange fan, this air exchange fan directly blows to the described transmissive mirror outside, be used to prevent that dust is sticking drops on the transmissive mirror outside, and form the exchange of the inside and outside air of casing.
10, metal bar counting system according to claim 1 is characterized in that: described acute angle is not more than 30 degree.
11, metal bar counting system according to claim 1 is characterized in that: to the transmissive mirror of described casing, be provided with the cone that is used to block stray light from the taking lens of described camera head.
12, metal bar counting system according to claim 1, it is characterized in that: described metal bar conveying equipment is provided with the baffle plate that is used to block carrier chain towards a side of camera head, this baffle plate is one with the plane that is positioned at the metal bar place on the carrier chain and is not more than 60 angles of spending, and its outside surface is made non-reflecting surface; And the end face that described metal bar is taken stretches out the side of described baffle-panels to camera head.
13, metal bar counting system according to claim 1 is characterized in that: the light of described active light source irradiation metal bar end and described metal bar coexist a plane or and plane, metal bar place between have one be not more than 20 the degree acute angles.
14, metal bar counting system according to claim 1, it is characterized in that: described metal bar conveying equipment is provided with and carrier chain travelling speed and the synchronous coded disc counting device of traffic direction, this coded disc counting device is used for deciding the compartment of terrain according to the move distance of carrier chain and sends the shooting signal to described camera head, makes in per two the adjacent images that are taken all to have overlapped part.
15, according to claim 13 or 14 described metal bar counting systems, it is characterized in that: also be provided with the mechanism that is used to force to flatten carrier chain on the described metal bar conveying equipment, be used for eliminating the image of metal bar end view picture carrier chain chain link projection of being taken.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100708276A CN100409256C (en) | 2004-07-20 | 2004-07-20 | Metal bar counting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100708276A CN100409256C (en) | 2004-07-20 | 2004-07-20 | Metal bar counting system |
Publications (2)
| Publication Number | Publication Date |
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| CN1725237A true CN1725237A (en) | 2006-01-25 |
| CN100409256C CN100409256C (en) | 2008-08-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100708276A Expired - Fee Related CN100409256C (en) | 2004-07-20 | 2004-07-20 | Metal bar counting system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101486391B (en) * | 2008-01-18 | 2010-12-15 | 北京光电技术研究所 | Automatic separation method and apparatus for metallic rod |
| CN107430702A (en) * | 2015-03-10 | 2017-12-01 | 首要金属科技德国有限责任公司 | Bar shaped article is counted based on acquired image |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003099755A (en) * | 2001-09-26 | 2003-04-04 | Daido Steel Co Ltd | Method of counting steel bar material |
-
2004
- 2004-07-20 CN CNB2004100708276A patent/CN100409256C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101486391B (en) * | 2008-01-18 | 2010-12-15 | 北京光电技术研究所 | Automatic separation method and apparatus for metallic rod |
| CN107430702A (en) * | 2015-03-10 | 2017-12-01 | 首要金属科技德国有限责任公司 | Bar shaped article is counted based on acquired image |
| CN107430702B (en) * | 2015-03-10 | 2021-03-12 | 首要金属科技德国有限责任公司 | Counting rod-shaped products based on the acquired images |
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| Publication number | Publication date |
|---|---|
| CN100409256C (en) | 2008-08-06 |
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Granted publication date: 20080806 |