CN102735513B - Movable asphalt mixture forming machine - Google Patents
Movable asphalt mixture forming machine Download PDFInfo
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- CN102735513B CN102735513B CN201210254445.3A CN201210254445A CN102735513B CN 102735513 B CN102735513 B CN 102735513B CN 201210254445 A CN201210254445 A CN 201210254445A CN 102735513 B CN102735513 B CN 102735513B
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Abstract
The invention provides a movable asphalt mixture forming machine which comprises a vehicle body, a speed reduction mechanism, a test die frame for arranging a test die, a hydraulic loading system and a wheel milling bracket assembly. The movable asphalt mixture forming machine is characterized in that the vehicle body is provided with wheels; the speed reduction mechanism is arranged in the vehicle body; the test die frame is movably arranged on the upper surface of the vehicle body; and the hydraulic loading system is used for driving a milling wheel in the wheel milling bracket assembly to apply a load to the test die in the test die frame.
Description
Technical field
The present invention relates to a kind of rolling forming machine, particularly a kind of mobile bitumen compound rolling forming machine.
Background technology
As requested, in the time carrying out asphalt mixture in track test, test specimen must carry out moulding by rolling method.
The asphalt rolling forming machine using both at home and abroad at present, bulky and heavy, be only suitable for testing laboratory and use.So test specimen is made and have to be taked to fetch testing laboratory from working-yard by the compound mixing and stirring, more cooling compound is reheated to the method for product.Cause ageing of asphalt owing to reheating like this, have a strong impact on the accuracy of test findings.
The asphalt rolling forming machine using is at present subject to the restriction of its structural principle.First the test specimen translational speed in the process of rolling, it is controlled and adopts gear drive and chain-wheel mechanism through what deceleration, and the motor speed of 1440 revs/min is down to 5 revs/min of test specimen translational speeds.This reduction gearing mechanism causes complex structure, and volume increases.The second, test specimen rolls the loading problem of process, should accomplish that linear load is adjustable, again constant pressure in specimen molding process.Traditional way is to adopt steelyard principle, and pressure should reach 9KN on request, and this just requires to lengthen the arm beam of steelyard, and counterweight (sliding weight of steelyard) quality reaches 200Kg; The counterweight of handling in addition 200KG moves and has increased again a set of sprocket drive system on the arm beam of steelyard.Cause so the huge heaviness of equipment volume, complex structure.This structure, in the time that test specimen is exchanged direction and handling test specimen, all need maneuvering chain wheel drive mechanism control counterweight to move it the top to the arm beam of steelyard, then manually arm beam of steelyard rolling wheel is lifted, can unload test specimen or test specimen and exchange direction, complex operation, labour intensity are large.Roll compound in process and be uneven, cause the arm beam of steelyard to tremble together with counterweight, cause grinding pressure fluctuation, bring many random labile factors to process of the test.The 3rd, due to its complex structure, bulky heaviness, not Portable belt (movement) transport, is applicable to laboratory special.
In order to overcome the problems referred to above, the invention provides a kind of mobile bitumen compound forming machine.This forming machine adopts the reducing gear control die trial translational speed of big retarding ratio, high pulling torque, accomplishes volume-diminished, weight saving.Loading system adopts hydraulic loaded, volume-diminished, weight saving.Improve quality, efficiency, reduced labour intensity.Increase travel mechanism, be convenient to mobile transport, reach the object of in-place forming bitumen mixture specimen.
Summary of the invention
For addressing the above problem, the invention provides a kind of mobile bitumen compound forming machine, comprise car body, reducing gear, for the die trial frame of die trial is set thereon, hydraulic loading system and rolling bracket component, it is characterized in that described car body comprises vehicle frame, wheel and handlebar, described handlebar is installed on vehicle frame one side, wheel is fixed on vehicle frame below makes vehicle frame removable, described vehicle frame is a rectangular box, described reducing gear is arranged in described casing, described die trial frame reciprocally moves and is arranged on described vehicle frame upper surface, described reducing gear is connected with described die trial frame by connecting rod, described rolling bracket component is fixed on described vehicle frame, the rolling wheel of described rolling bracket component aligns with the die trial being arranged on die trial frame of its below, described hydraulic loading system is for driving the rolling wheel of described rolling bracket component with the test specimen imposed load in described die trial.
Described reducing gear comprises the first motor, reductor, minor sprocket, hinge wheel, driving-chain, rotating disk, the output shaft of described the first motor is connected with the input shaft of described reductor, reductor exports minor sprocket to, minor sprocket through driving-chain by transmission of rotation to hinge wheel, described hinge wheel and rotating disk are fixed on same axle to drive dial rotation, fix one end of a connecting rod at the edge of described rotating disk, the other end of described connecting rod is fixed on one end of die trial frame, and the rotation of rotating disk drives die trial frame to move reciprocatingly.
Described reductor (3) is cycloid pin gear planet speed reducer.
The reduction gear ratio of described reducing gear is 1/240-1/360, is preferably 1/261.
Described hydraulic loading system comprises the second motor, fuel tank, surplus valve, reversal valve, tensimeter, oil pipe, oil cylinder, oil pump, described the second motor drives oil pump pump oil from fuel tank, the output oil pipe of fuel tank is connected with surplus valve, the output oil pipe of described fuel tank is also connected with oil cylinder by reversal valve, and wherein tensimeter is arranged between reversal valve and oil cylinder, for measuring the oil pressure of oil pipe, the stroke of oil cylinder is 80mm-120mm, is preferably 100mm.
Described rolling bracket component comprises rolling wheel, guide rail, bearing, support, one end of described oil cylinder is fixed on the entablature of support, in the rotating shaft of the both sides, cylinder barrel upper end of oil cylinder, be set with rolling wheel, and the rotating shaft of the both sides, cylinder barrel upper end of oil cylinder is arranged in guide rail by bearing, described guide rail is perpendicular to the entablature of support, one end is fixed on described entablature, and the other end is to downward-extension, and described rolling wheel is fixed on cylinder tube by rotating shaft, both can move up and down with oil cylinder, again can be around the shaft swing being fixed on cylinder tube.
Described rolling wheel is sector, and radius is 400mm-600mm, is preferably 500mm, and arc length is 350mm, and width is 300mm.
The present invention's implementation structure from structural principle is simple, small and exquisite, and on-the-spot use, from the fixed movable type that becomes.Not only make technique simple, met functions of the equipments requirement, its physical dimension and structure have also met the requirement of integral arrangement well, the hydraulic loading system that the present invention adopts, and loading and unloading only need be handled reversal valve, can complete
Lifting of rolling wheel put, pressure regulator valve adjustable pressure, and after pressure setting, it is constant that grinding pressure keeps.Make compact conformation, easy to operate, work efficiency is high, staff's labour intensity reduces greatly.
Brief description of the drawings
By example, the present invention is described referring now to accompanying drawing, wherein:
Fig. 1 is the schematic diagram of the on-the-spot rolling forming machine of mobile bitumen compound of the present invention;
Fig. 2 is the schematic diagram of reducing gear of the present invention;
Fig. 3 is the schematic diagram of hydraulic loading system of the present invention;
Fig. 4 is the schematic diagram of rolling bracket component of the present invention.
Wherein:
1-vehicle frame, 2-the first motor, 3-reductor, 4-chain wheel assembly, 41-minor sprocket, 42-hinge wheel, 43-driving-chain, 5-rotating disk, 6-connecting rod, 7-hydraulic loading system, 71-the second motor, 72-fuel tank, 73-surplus valve, 74-reversal valve, 75-tensimeter, 76-oil pipe, 77-oil cylinder, 78-oil pump, 8-rolling bracket component, 81-rolling wheel, 82-guide rail, 83-bearing, 84-support, 9-handlebar, 10-die trial frame.
Embodiment
The invention provides the on-the-spot rolling forming machine of a kind of mobile bitumen compound.The structure of the on-the-spot rolling forming machine of this mobile bitumen compound as shown in Figure 1.
This forming machine comprises car body, reducing gear, and die trial frame, hydraulic loading system and rolling bracket component, described car body comprises vehicle frame 1, wheel and handlebar, handlebar is installed on vehicle frame one side, and wheel is fixed on vehicle frame below, is convenient to vehicle frame and moves.Vehicle frame is body structure, and reducing gear is arranged in frame box.
As shown in Figure 2, reducing gear comprises the first motor (2), reductor (3), minor sprocket (41), hinge wheel (42), driving-chain 43, rotating disk 5.Reductor is cycloid pin gear planet speed reducer, this reductor application Gear Planet Transmission principle, adopts cycloidal pin teeth engagement, and reduction gear ratio is large, engagement position adopts the engagement of rolling, therefore transmission efficiency can reach more than 90%, has not only adopted Gear Planet Transmission principle, its input shaft and output shaft are on same axis, and this reductor and the first motor direct connection are one, have compact conformation, volume is little, lightweight feature.The output shaft of the first motor 2 is connected with the input shaft of reductor 3, reductor 3 exports minor sprocket 41 to, minor sprocket 41 through driving-chain 43 by transmission of rotation to hinge wheel 42, described hinge wheel 42 is fixed on same axle to drive rotating disk 5 to rotate with rotating disk 5, this reducing gear volume is little, lightweight, output torque is large, adopts the two poles of the earth to slow down.Through evidence, die trial translational speed is that per minute comes and goes 4-6 time for the best, therefore needs the rotating speed of the first motor from 1440 revs/min, and through reducing to 4-6 rev/min, reduction gear ratio is 1/240-1/360.In this example, adopting reduction gear ratio is that 1/87 planetary cycloidal pin gear carries out primary speed-down, and reduction gear ratio does not reach requirement yet, and therefore adopting again reduction gear ratio is that double reduction is carried out in 1/3 chain transmission, and total reduction ratio is 1/261.Adopting chain transmission is because chain sprocket drive has gear drive and the feature with transmission concurrently as double reduction, and compared with gear drive, chaindriven installation accuracy and manufacturing accuracy require low; The bearing capacity ratio gear of sprocket wheel is large, and tooth surface abrasion is lighter, and buffering vibration absorption ability is strong.Chain transmission is compared with band transmission, and chaindriven ratio of gear is accurate, and transmission efficiency is high, and chain is little to the effect of axle, and compact conformation is strong to environmental suitability.
Die trial frame 10 is arranged on frame box, and this die trial frame bottom arranges roller, can on frame box, move back and forth, and die trial is arranged on die trial frame.Connecting rod 6 one end are fixed on the edge of rotating disk 5, and the other end is fixed on die trial frame one end, rotating disk rotarily drive connecting rod 6 and die trial frame 10 moves reciprocatingly.The output of sprocket wheel drives the rotation of rotating disk, often rotates a circle, and die trial frame makes a round trip.
Hydraulic loading system 7 is for making rolling wheel to test specimen on-load pressure by oil cylinder 77.As shown in Figure 3, this hydraulic loading system is by the second motor 71, fuel tank 72, surplus valve 73, and reversal valve 74, tensimeter 75, oil pipe 76, oil cylinder 77, oil pump 78 forms.The second motor 71 is for driving oil pump 78 from fuel tank 72 pump oil, and the output oil pipe of fuel tank 72 is connected with surplus valve 73, and is connected with oil cylinder 77 by reversal valve 74, and wherein tensimeter 75 is arranged between reversal valve 74 and oil cylinder 77, for measuring the oil pressure of oil pipe.This hydraulic loading system is closed, and surplus valve 73 is set up by the pressure requirement of specimen molding.When moulding, the linear pressure of rolling wheel is 300N/cm, and rolling wheel width is 30cm, and it is 9KN that rolling wheel is adjusted gross load.According to this requirement, set pressure gauge pressure.Oil cylinder 77 diameter 45mm, tensimeter pressure 57.8kg/cm
2.
The stroke of oil cylinder 77 is 80mm-120mm, being preferably 100mm, there is requirement to hydraulic loading system in the size of oil cylinder stroke, and excessive and too small oil cylinder stroke all selects to bring difficulty to the parts of hydraulic loading system, excessively make troubles to integral arrangement, cause volume excessive.The too small forming requirements that can not meet different-thickness test specimen, above-mentioned oil cylinder stroke both can ensure can normally working of hydraulic loading system, and can not need each parts of hydraulic loading system to carry out special setting, save workload, and this hydraulic stroke also meets the bitumen mixture specimen of processing different-thickness demand just.When work, the die trial that fills asphalt is placed on die trial frame, handles reversal valve 74 and put down gently rolling wheel, set up after load wait reaching, surplus valve work, it is constant that pressure keeps.Roll rear manipulation reversal valve 74, lifted oil cylinder and rolling wheel, completed specimen molding.
As shown in Figure 4, rolling bracket component 8 is fixed on vehicle frame, this rolling bracket component comprises rolling wheel 81, guide rail 82, bearing 83, support 84, one end of oil cylinder 77 is fixed on support 84 entablatures, in the rotating shaft of oil cylinder 77 both sides, cylinder barrel upper end, be set with rolling wheel 81, and the rotating shaft of oil cylinder 77 both sides, cylinder barrel upper end is arranged in guide rail 82 by bearing 83, described guide rail 82 one end are fixed on the entablature of support 84, the other end perpendicular to entablature to downward-extension, rolling wheel 81 is fixed on cylinder tube by rotating shaft, both can move up and down with oil cylinder, again can be around the shaft swing being fixed on cylinder tube.Rolling wheel adopts the circular arc rolling wheel similar to steel cylinder formula street roller, radius is 400mm-600mm, be preferably 500mm, above-mentioned radius is suitable for movably in forming machine rolling wheel, excessive rolling wheel cannot be arranged in movable forming machine, and too small rolling wheel cannot ensure that institute's formed asphalt compound test specimen can meet user demand.Structurally adopt pressing wheel mechanism, rolling wheel is sector, it is constant that guarantee rolls radian, this rolling wheel is connected with the cylinder tube of hydraulic loading system, by hydraulic loading system control, it lifts and puts down, under stress state, roll freely again, the arc length of this rolling wheel is 350mm, and width is 300mm.Both ensured radius requirement, solve again hydraulic loaded problem, simple in structure small and exquisite, above-mentioned arc length guarantees that rolling wheel can use whole arc length to roll in the process around shaft swing, avoid the long rolling wheel causing of arc length excessive, also avoided arc length too short cause roll deficiency, above-mentioned width can guarantee to roll completely whole test specimen.
Adopt and manufacture with the following method bitumen mixture specimen:
Step 1: preheating die trial in baking oven, take the programming rates of per minute rising 10 degree that die trial is preheated to after 100 DEG C, be placed in baking oven 1 hour with the temperature of 100 DEG C, preheating in the general direct baking oven that die trial is arranged on to 100 DEG C in prior art, but the die trial of this preheating method preheating is yielding, and serviceable life is low, the pre-heating mean that the present invention takes makes die trial not yielding, and improve 70% serviceable life, after preheating, die trial is taken out from baking oven, die trial framework is installed in die trial;
Step 2: lay paper on the bottom surface of die trial and side, the speed that packs 30cm3 into per minute after required asphalt being stirred with scuppit equably along die trial by limit in pack in order die trial into and make test specimen, to being packed into, asphalt packs speed no requirement (NR) in die trial in the prior art, but the inevasible bubble that exists in the bitumen mixture specimen of method manufacture of the prior art, easily forming stress concentrates, cause bitumen mixture specimen easy to crack, serviceable life is low, applicant finds in the process of manufacturing test specimen, the rate of injection of compound has a great impact the tool in serviceable life of test specimen, the rate of injection that the present invention adopts has well avoided producing bubble in test specimen, avoid stress to concentrate, make improve 90% the serviceable life of test specimen, the center of test specimen is higher than surrounding 2-5mm, upper surface forms dome arc, if test specimen middle part makes the specimen thickness after compacting test specimen excessive or too fine and close higher than the too high meeting of surrounding, if whole specimen thickness is too small when test specimen middle part makes compacting test specimen higher than the too low meeting of surrounding, test specimen density deficiency after compacting, the test specimen of manufacturing is undesirable,
Step 3: take off die trial framework, with the small-sized compaction hammer of preheating by test specimen by limit to middle compacting, become dome curved upper surface, when material test specimen to be mixed is cooled to the compacting temperature of regulation, lay kraft on test specimen surface;
Step 4: die trial is arranged on the platform of die trial frame, handle the first motor switch of reducing gear make die trial be centered in oil cylinder under, adjust rolling wheel position, make die trial, rolling wheel and oil cylinder center-aligned;
Step 5: play the trend rolling wheel hydraulic loading system of exerting pressure, the reversal valve of operating hydraulically operated loading system puts down rolling wheel, in the time compressing after-applied load and reach preset pressure, keeps constant pressure, the predetermined number of times that rolls;
Step 6: the first motor of start and deceleration mechanism, the die trial frame that die trial is installed starts to-and-fro movement, first rolling 2 with 5 round speed of per minute comes and goes, stop the first motor of described reducing gear, the reversal valve of handling described hydraulic loading system lifts rolling wheel, by after die trial tune, handle reversal valve and put down rolling wheel, uniform pressure in loading and step 5, identical shuttle speed rolls 2 and comes and goes, applicant in use finds, in the process of processing test specimen, rolling shuttle speed has a significant impact quality and the serviceable life to test specimen, in prior art, shuttle speed is not claimed, the present invention adopts the above-mentioned compactness that rolls shuttle speed and can guarantee processed test specimen, reduce the wherein formation of bubble, reducing stress concentrates, improve the serviceable life of test specimen,
Step 7: repeating step six is to test specimen being rolled to till meeting Marshall standard packing 100 ± 1% or reach predetermined and stop after rolling number of times; Can determine and roll number of times through pressure testing before the formal compacting of test specimen, general 12 round left and right Ke Da requirements, to special asphalt, should determine and roll number of times before test, make the mixture density of compacting meet Marshall Test and hit real density;
Step 8: unload after compaction moulding, throw off surperficial paper, indicate and roll direction on test specimen surface, fill the die trial of compacting test specimen, put the demoulding after cooling at least 12 hours under room temperature, take off test specimen.
The present invention is simple and compact for structure, quality is light, and reducing gear volume is little, and loading measure is simple, maneuverability, and the transport that is easy to carry, adapts to the on-the-spot various requirement using.Working-yard research technique was both provided, had avoided post bake, improved the accuracy detecting, can be used for again indoor.Simple to operate, both improved work efficiency, greatly reduce again staff's labour intensity.
Claims (8)
1. a mobile bitumen compound forming machine, comprise car body, reducing gear, for the die trial frame (10) of die trial is set thereon, hydraulic loading system (7) and rolling bracket component (8), it is characterized in that described car body comprises vehicle frame (1), wheel and handlebar, described handlebar is installed on vehicle frame one side, wheel is fixed on vehicle frame below makes vehicle frame removable, described vehicle frame is a rectangular box, described reducing gear is arranged in described casing, described die trial frame (10) reciprocally moves and is arranged on described vehicle frame upper surface, described reducing gear is connected with described die trial frame (10) by connecting rod, described rolling bracket component (8) is fixed on described vehicle frame,
Described rolling bracket component (8) comprises rolling wheel (81), guide rail (82), bearing (83), support (84), in described hydraulic loading system (7), one end of oil cylinder (77) is fixed on the entablature of support (84), in the rotating shaft of the both sides, cylinder barrel upper end of oil cylinder (77), be set with rolling wheel (81), and the rotating shaft of both sides, oil cylinder (77) cylinder barrel upper end is arranged in guide rail (82) by bearing (83), described guide rail (82) is perpendicular to the entablature of support (84), one end is fixed on described entablature, the other end is to downward-extension, described rolling wheel (81) is arranged on oil cylinder (77) cylinder barrel by rotating shaft, both can be with on cylinder barrel, lower movement, again can be around the shaft swing being fixed on cylinder barrel, align with the die trial being arranged on die trial frame in rolling wheel (81) below, described hydraulic loading system (7) is for driving rolling wheel with the test specimen imposed load to described die trial.
2. mobile bitumen compound forming machine as claimed in claim 1, it is characterized in that described reducing gear comprises the first motor (2), reductor (3), minor sprocket (41), hinge wheel (42), driving-chain (43), rotating disk (5), the output shaft of described the first motor (2) is connected with the input shaft of described reductor (3), reductor (3) exports minor sprocket (41) to, minor sprocket (41) through driving-chain (43) by transmission of rotation to hinge wheel (42), described hinge wheel (42) is fixed on same axle to drive rotating disk (5) to rotate with rotating disk (5), fix one end of a connecting rod (6) at the edge of described rotating disk, the other end of described connecting rod (6) is fixed on one end of die trial frame, the rotation of rotating disk (5) drives die trial frame (10) to move reciprocatingly.
3. mobile bitumen compound forming machine as claimed in claim 2, is characterized in that described reductor (3) is cycloid pin gear planet speed reducer.
4. mobile bitumen compound forming machine as claimed in claim 2, the reduction gear ratio that it is characterized in that described reducing gear is 1/240-1/360.
5. mobile bitumen compound forming machine as claimed in claim 4, the reduction gear ratio that it is characterized in that described reducing gear is 1/261.
6. mobile bitumen compound forming machine as claimed in claim 1, it is characterized in that described hydraulic loading system (7) comprises the second motor (71), fuel tank (72), surplus valve (73), reversal valve (74), tensimeter (75), oil pipe (76), oil cylinder (77), oil pump (78), described the second motor (71) drives oil pump (78) pump oil from fuel tank (72), the output oil pipe of fuel tank (72) is connected with surplus valve (73), the output oil pipe of described fuel tank (72) is also connected with oil cylinder (77) by reversal valve (74), wherein tensimeter (75) is arranged between reversal valve (74) and oil cylinder (77), for measuring the oil pressure of oil pipe, the stroke of oil cylinder (77) is 80mm-120mm.
7. mobile bitumen compound forming machine as claimed in claim 1, is characterized in that described rolling wheel is sector, and radius is 400mm-600mm, and arc length is 350mm, and width is 300mm.
8. mobile bitumen compound forming machine as claimed in claim 7, is characterized in that the fan-shaped radius of described rolling wheel (81) is 500mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210254445.3A CN102735513B (en) | 2012-07-19 | 2012-07-19 | Movable asphalt mixture forming machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210254445.3A CN102735513B (en) | 2012-07-19 | 2012-07-19 | Movable asphalt mixture forming machine |
Publications (2)
| Publication Number | Publication Date |
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| CN102735513A CN102735513A (en) | 2012-10-17 |
| CN102735513B true CN102735513B (en) | 2014-08-06 |
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| CN201210254445.3A Expired - Fee Related CN102735513B (en) | 2012-07-19 | 2012-07-19 | Movable asphalt mixture forming machine |
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| CN106053180B (en) * | 2016-08-08 | 2018-11-20 | 山西省交通科学研究院 | The analog vibration rolling molding machine and test specimen production method of bitumen mixture specimen |
| CN106053179B (en) * | 2016-08-08 | 2018-11-09 | 山西省交通科学研究院 | The simulation rolling molding machine and test specimen production method of bitumen mixture specimen |
| CN106124273B (en) * | 2016-08-08 | 2018-11-09 | 山西省交通科学研究院 | Make the simulation rolling molding machine and test specimen production method of bitumen mixture specimen |
| CN107589003B (en) * | 2017-09-09 | 2020-04-21 | 芜湖市方圆工程质量检验有限责任公司 | Rut sample forming machine with rotatable rolling wheel |
| CN110849685B (en) * | 2019-11-22 | 2024-01-02 | 长安大学 | Asphalt mixture wheel grinding compaction all-in-one machine and grinding compaction method |
| CN112709105B (en) * | 2020-12-25 | 2022-06-03 | 重庆建工集团股份有限公司 | Asphalt additional paving device for old cement concrete pavement reconstruction |
| CN113567208B (en) * | 2021-07-21 | 2024-03-26 | 长安大学 | Arc mould bituminous material pavement test piece forming machine |
| CN114754949B (en) * | 2022-03-25 | 2024-01-30 | 山东交通学院 | Suspension driving type bridge durability wheel load experimental device |
| CN114754951A (en) * | 2022-03-25 | 2022-07-15 | 山东交通学院 | Through type bridge durability wheel load experimental device |
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Inventor after: Jiao Yongshun Inventor after: Su Min Inventor after: Liu Guijun Inventor after: Zhang Zhongmin Inventor after: Guo Xiaohua Inventor before: Su Min Inventor before: Liu Guijun Inventor before: Jiang Lan Inventor before: Guo Xiaohua |
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| COR | Change of bibliographic data |
Free format text: CORRECT: INVENTOR; FROM: SU MIN LIU GUIJUN JIANG LAN GUO XIAOHUA TO: JIAO YONGSHUN SU MIN LIU GUIJUN ZHANG ZHONGMIN GUO XIAOHUA |
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Granted publication date: 20140806 Termination date: 20200719 |