CN102275274B - The injection mechanism of super large injection volume and the extruding technique of super-large size plastic goods - Google Patents
The injection mechanism of super large injection volume and the extruding technique of super-large size plastic goods Download PDFInfo
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- CN102275274B CN102275274B CN201110125173.2A CN201110125173A CN102275274B CN 102275274 B CN102275274 B CN 102275274B CN 201110125173 A CN201110125173 A CN 201110125173A CN 102275274 B CN102275274 B CN 102275274B
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Abstract
The present invention relates to the injection mechanism of a kind of super large injection volume and the extruding technique of super-large size plastic goods, this mechanism is made up of a plastifying organization and an injection mechanism, the accumulator of injection mechanism is provided with the injection orifice of injection nozzle and the mould of band hydraulic pressure envelope mouth can close contacting fit turning on, melted sizing material is directly squeezed in the die cavity of mould by the accumulator of the injection mechanism that the rubber melting cylinder of plastifying organization is turned on by pipeline through injection nozzle, the injection orifice of described mould is provided with cavity pressure sensor, extruding super-large size plastic goods of the present invention use above-mentioned injection moulding mechanism, the injection moulding mechanism of the present invention is applied in super-large size plastic injection moulding machine, single plastifying organization and single injection mechanism constitute the technical problem of the injection moulding super-large size plastic goods realizing super large injection volume.
Description
Technical field
The present invention relates to screw plunger type injection (mo(u)lding) machine and penetrate the injection machine of platform structure, particularly relate to the injection mechanism of super large injection volume and the extruding technique of super-large size plastic goods.
Background technology
Along with Urbanization in China is accelerated, at municipal pipeline facility, communal facility, and modern industry, the plastic demand of bigger overall dimensions there is the trend constantly risen.The profile of plasthetics increases, and its weight the most correspondingly develops into hundreds of kilogram from several kilograms.Such as, being widely used in the PE pipe fitting of the industries such as natural gas, feedwater, building materials, hydroelectric project, its weight has reached hundreds of kilogram.Tackling the development of this industrial requirement, solution typically now is to use screw plunger type injection structure, utilizes the mode of accumulator to improve disposable injection volume.The defect of this scheme is as the weight of goods to be increased, and the diameter of its accumulator, injection stroke are by increasing.Such as, the PE pipe fitting of 20 myriagrams that weigh, require during its injection moulding that disposable injection volume to reach about 23 myriagrams, could moulded products.The internal diameter of the accumulator producing this PE pipe fitting reaches 400mm, and injection stroke is up to 2000mm, and the processing and manufacturing cost of this accumulator is the highest, and the difficulty of processing of this part is the biggest, and general factory can't reach production requirement.The patent of Patent No. ZL200720059325.2 of the applicant discloses a kind of screw plunger type plastic-injection moulding machine injection structure, but it is not met by the injection volume of super-large size plastic injection moulding machine, if by the larger of this mechanism, the most all supporting element sizes are both needed to strengthen, such as overstriking screw rod, strengthening melten gel motor etc., large-scale parts machining difficulty is big, cost is high, the cost causing whole equipment remains high, and has the shortcomings such as structure is complicated.Tackling the development of current this industrial requirement, current structure design cannot meet the needs of plastic shaping industrial development, it is necessary to what exploitation can provide higher injection volume injection machine penetrates platform structure.On the basis of this patent, the applicant also been proposed and uses one principal post plug cylinder of above-mentioned patent and three or five, the injection moulding mechanism of the subpost plug cylinder compositions such as six, size according to injection volume determines the quantity of suitable subpost plug cylinder, solves the working ability problem solving plastic-injection moulding machine processing super large plastic.They common techniques are all when plasticizing, hydraulic pressure envelope mouth closed injection material road.Plasticizing apparatus simultaneously melten gel (can also successively melten gel), the most melted sizing material is stored in accumulator, form melten gel pressure, and each self-propelled stopper head, stopper head rollback, and drive plunger stem flange, plunger stem flange rollback, when the full required sizing material of storage, just inject after i.e. completing melten gel action；During injection, hydraulic pressure envelope mouth opens injection material road.Pressure oil enters in oil cylinder chamber, promotes piston piston rod, note chock plug to move forward, and the melted sizing material in the secondary accumulator of extruding forms injection pressure, pushes check valve open, and melted sizing material is entered in main accumulator by connector；Owing to stopper head can not retreat, can only be injected in mould by hydraulic pressure envelope mouth from the melted sizing material in secondary accumulator.After sizing material melted in secondary accumulator has been injected, pressure oil enters in oil cylinder, promotes piston piston rod, injection head to move forward, extrudes the melted sizing material in main accumulator, forms injection pressure；Due to the one-way function of check valve, sizing material can not flow to secondary accumulator, can only inject mould by hydraulic pressure envelope mouth, the most also be completed the pressurize work of molding by main accumulator.Wherein, melten gel amount in rubber melting cylinder and accumulator and realizing by being controlled injection pressure by compression pump or oil cylinder, injection volume therein can only be compression pump or oil cylinder controls injection pressure estimation substantially, has the coarse drawbacks limit of injection volume；Simultaneously, if product weight further increases, the diameter of its accumulator or length be will be further increased or realized by the frame mode of the secondary accumulator of combination, part will be caused to process, corresponding injection device can not be produced, and there is the shortcomings such as structure is complicated, also it is impossible to produce the injecting products of hundreds of kilogram of weighing.Limited by equipment, it is impossible to produce ultra-large type injected articles.The present invention limits for releasing this kind, for the extruding technique of molding a kind of novelty of offer of ultra-large type injection-molded item.
Summary of the invention
The invention solves the problems that technical problem is to provide a kind of injection mechanism with super large injection volume simple and compact for structure.
For solving above-mentioned technical problem, a kind of injection mechanism of the super large injection volume of the present invention, this mechanism is made up of a plastifying organization and an injection mechanism, the rubber melting cylinder of plastifying organization is turned on by the accumulator pipeline of injection mechanism, it is provided with check valve, the accumulator of injection mechanism be provided with injection orifice and the mould of band hydraulic pressure envelope mouth injection orifice can close contacting fit turning on, the injection orifice of its described mould is provided with cavity pressure sensor.
The injection mechanism of above-mentioned super large injection volume, described casting moulds is made up of dynamic model, cover half, and described sprue gate is arranged on cover half.
The injection mechanism of above-mentioned super large injection volume, described plastifying organization includes motor, hopper, power transmission shaft, connection seat, rubber melting cylinder, screw rod and connector, check valve and transition body；Described injection mechanism includes head connected body, accumulator, material cylinder bearing, accumulator flange, guide pillar, piston rod, oil cylinder front cover, piston, cylinder support, oil cylinder, oil cylinder bonnet and stopper head；Described connector is connected by transition body and accumulator are fixing and turn on, check valve is arranged between connector and transition body, described connector and motor are separately positioned on rubber melting cylinder rear and front end, screw rod is located in rubber melting cylinder, its rear end interlocks with motor, and hopper is arranged between rubber melting cylinder and motor and is positioned on guide pillar by connection seat；Being connected by guide pillar between described accumulator and oil cylinder and be positioned on guide rod by material cylinder bearing and cylinder support, stopper head and the piston of oil cylinder in accumulator are interlocked by piston rod.
Due to the fact that employing technique scheme, wherein by the solution pressure injected by plastifying organization in the cavity pressure sensor settings die cavity of setting in the injection orifice of mould, the solution force value designed according to die cavity size accurately controls, change in conventional art and controlled the melten gel amount in rubber melting cylinder and accumulator by compression pump or oil cylinder and realized by its injection pressure, injection volume therein can only be the defect of estimation substantially, realize Stress control precisely and the pressure controlled technique effect of whole process, solve the working ability problem of plastic-injection moulding machine processing super large plastic, the technique effect that the injector structure of simplification realizes the injection moulding super-large size plastic goods of super large injection volume it is made up of single plastifying organization and single injection mechanism.The present invention compared with prior art has the simple in construction of whole equipment, low processing cost, reduces the physical dimension of parts, simple in construction, beneficially parts machining and production, reduces cost.
The invention solves the problems that the technical problem being made up of the injection moulding super-large size plastic goods realizing super large injection volume above-mentioned single plastifying organization and single injection mechanism, a kind of extruding technique of the super-large size plastic goods of the present invention, its extruding super-large size plastic goods use above-mentioned injection moulding mechanism, including following technological process: 1. mold-locked, the plastifying organization of nozzle hole and mould injection orifice close contacting fit → 2. is to accumulator storing → the most directly extrude mold filling, die cavity sizing material reaches solution pressure transducer and sets pressure → 4. accumulator injection pressurize feeding → 5. take out goods, by above-mentioned five steps, just constitute an injection cycle；Complete a large-scale or production for ultra-large type injection-molded item, return the and 1. walk, restart next product molding；Described flow process 1. in the injection orifice of injection nozzle and mould of accumulator of injection mechanism can close contacting fit turning on, described flow process 2. described in the accumulator of injection mechanism that turned on by pipeline of the rubber melting cylinder of plastifying organization be full of melten gel, described flow process 3. described in the rubber melting cylinder of plastifying organization make accumulator storing continue melted sizing material after being full of melten gel to be directly squeezed in the die cavity of mould through injection nozzle, squeeze and complete extrude mold filling action and stop melten gel to cavity pressure sensor settings solution pressure.
The extruding technique of above-mentioned a kind of super-large size plastic goods, described step 1., the first dynamic model of moulded products, cover half, under the clamping mechanism effect of injection (mo(u)lding) machine, locking is dynamic, cover half, completes locked mode action；Under the drive penetrating platform mobile device, nozzle and hydraulic pressure are sealed mouth and cover half close contacting fit.
The extruding technique of above-mentioned a kind of super-large size plastic goods, described step 2., accumulator storing, hydraulic pressure envelope mouth seals injection material road, sizing material after plasticizing is under extrusion screw rod promotes, flow to connector, in connector, the most melted sizing material accumulation certain pressure pusher opening one-way valve, flow through transition body, arrive accumulator.Constantly it is flowed into accumulator and melts sizing material, because can not go out by surface current in the past, promote stopper head to retreat after accumulation certain pressure.Stopper head retreats, and drives piston rod, piston to retreat, until storing reaches preset value, completes at accumulator storing.Heat with to mould, reach design temperature.Wherein being sealed material road, front end by hydraulic pressure envelope mouth, the melted sizing material that plastifying organization produces is through connector, check valve, transition body, entrance accumulator, and first storing in accumulator, when storing arrives setting position, completes the storing in accumulator；And while accumulator storing, mould is heated, makes mould reach preset temperature.When mold temperature does not affects product molding, it is also possible to the most specially mould is heated.
The extruding technique of above-mentioned a kind of super-large size plastic goods, described step 3., extrusion mold filling, when completing after the work of accumulator storing and mould heating reach to set heating-up temperature, hydraulic pressure envelope mouth opens material road, melted sizing material, by connector, is extruded in die cavity through check valve, transition body, storing, hydraulic pressure envelope mouth.In die cavity, clamp-on sizing material melt body pressure when reaching preset value, complete to extrude mold filling action, and stop melten gel, enter next step.
The extruding technique of above-mentioned a kind of super-large size plastic goods, described step 4., hydraulic pressure envelope mouth still in the state opening injection material road, pressure oil enters the rodless cavity of oil cylinder, promote piston advances forward, driving piston rod, stopper head to move forward, extruding sizing material forms injection pressure, due to the one-way flow effect of check valve, melted sizing material can only enter die cavity by hydraulic pressure envelope mouth injection, completes storing mold filling, pressurize action.
The extruding technique of above-mentioned a kind of super-large size plastic goods, described step 5., plastic proceeded to cooling and shaping by pressurize, then open mould, take out plastic, so far complete a product molding, return the 1. stepping enter next production of articles circulation.
nullExtruding technique of the present invention，Topmost difference with other Shooting Technique is: the most of sizing material needed for moulded products is from step in present invention process 3.，Realize described flow process 3. described in the rubber melting cylinder of plastifying organization make accumulator storing continue melted sizing material after being full of melten gel to be directly squeezed in the die cavity of mould through injection nozzle，Squeeze and complete extrude mold filling action and stop melten gel to cavity pressure sensor settings solution pressure，Wherein by the solution pressure injected by plastifying organization in the cavity pressure sensor settings die cavity of setting in the injection orifice of mould，The solution force value designed according to die cavity size accurately controls，Change in conventional art and controlled the melten gel amount in rubber melting cylinder and accumulator by compression pump or oil cylinder and realized by its injection pressure，Injection volume therein can only be the defect of estimation substantially，Realize Stress control precisely and the pressure controlled technique effect of whole process，Realize the technical problem of the injection moulding super-large size plastic goods of super large injection volume.The present invention compared with prior art, has the height saving achieving energy consumption and the technique effect simplifying injection technique.
Accompanying drawing explanation
Below in conjunction with the embodiment in accompanying drawing, the present invention is described in further detail, but does not constitute any limitation of the invention.
Fig. 1 present invention process schematic flow sheet；
Fig. 2 present invention process step 1. time technique penetrate platform use status architecture schematic diagram；
Fig. 3 present invention process step 2. time technique penetrate platform use status architecture schematic diagram；
Fig. 4 present invention process step 3. time technique penetrate platform use status architecture schematic diagram；
Fig. 5 present invention process step 4. time technique penetrate platform use status architecture schematic diagram；
Fig. 6 present invention process step 5. time technique penetrate platform use status architecture schematic diagram.
Detailed description of the invention
As shown in figs. 1 to 6, a kind of injection mechanism of the super large injection volume of the present invention, this mechanism is made up of a plastifying organization 101 and an injection mechanism 102, the accumulator of injection mechanism 102 is provided with the injection orifice of injection nozzle and the mould 103 of band hydraulic pressure envelope mouth can close contacting fit turning on, melted sizing material in injection nozzle is directly squeezed into the die cavity A of mould 103, is provided with cavity pressure sensor 27 by the accumulator of the injection mechanism 102 that the rubber melting cylinder of plastifying organization 101 is turned on by pipeline in the injection orifice of mould；
Mould 103 is made up of dynamic model 25, cover half 26, and sprue gate is arranged on cover half 26；
Plastifying organization 101 includes motor 16, hopper 15, power transmission shaft 14, connects seat 13, rubber melting cylinder 8, screw rod 7 and connector 6, check valve 5 and transition body 4；Injection mechanism 102 includes head connected body 2, accumulator 3, material cylinder bearing 9, accumulator flange 10, guide pillar 11, piston rod 12, oil cylinder front cover 17, piston 18, cylinder support 19, oil cylinder 20, oil cylinder bonnet 21 and stopper head 22；Connector 6 is connected by transition body 4 is fixing with accumulator 3 and turns on, check valve 5 is arranged between connector 6 and transition body 4, connector 6 and motor 16 are separately positioned on rubber melting cylinder 8 rear and front end, screw rod 7 is located in rubber melting cylinder 8, its rear end interlocks with motor 16, and hopper 15 is arranged between rubber melting cylinder 8 and motor 16 and is positioned on guide pillar 11 by connection seat 13；Being connected by guide pillar 11 between accumulator 3 and oil cylinder 20 and be positioned on guide rod 23 by material cylinder bearing 9 and cylinder support 19, stopper head 22 and the piston 18 of oil cylinder 20 in accumulator 3 are interlocked by piston rod 12.
Utilize above-mentioned injection structure, then coordinate the clamping mechanism of injection (mo(u)lding) machine and other parts, mould etc. to constitute an injection molding apparatus.As shown in Figure of description 2, dynamic model 25, cover half 26, cavity pressure sensor 27.The of this moulding process 1. step is: utilize the clamping mechanism of injection (mo(u)lding) machine, by mold-locked, with penetrating platform mobile device by nozzle and mould close contacting fit.Its role is to, the Jiao Kou in injection structure material road and mould is linked up, form the cavity volume of a Guan Bi.
As shown in Figure of description 3,2. for moulding process of the present invention walk.In this step, during plastics plasticizing, hydraulic pressure envelope mouth 1 seals injection material road, will not be flowed out by hydraulic pressure envelope mouth 1 that is, melt sizing material during plastics plasticizing.Sizing material after plasticizing, under extrusion screw rod 7 promotes, flows to connector 6, in connector 6, and the most melted sizing material accumulation certain pressure pusher opening one-way valve 5, flow through transition body 4, arrive accumulator 3.Constantly it is squeezed into accumulator 3 and melts sizing material, because can not go out by surface current in the past, promote stopper head 22 to retreat after accumulation certain pressure.Stopper head 22 retreats, and drives piston rod 12, piston 18 to retreat, until storing reaches preset value, completes the storing in accumulator.While accumulator storing, heating is after mould reaches design temperature, and 2. the of complete cost process walk, and enters next step.
As shown in Figure of description 4,3. for moulding process of the present invention walk.In this step, plastifying organization continues plasticizing sizing material, and hydraulic pressure envelope mouth 1 opens injection material road, the sizing material plastified, under extrusion screw rod 7 promotes, forms certain pressure, flows through connector 6, open check valve 5, seal mouth 1 by transition body 4, accumulator 3, nozzle and hydraulic pressure, be extruded in die cavity.Now, in die cavity, sizing material is maintained as molten condition, along with clamp-oning increasing of sizing material, pressure in die cavity will gradually rise, when the pressure in cavity pressure sensor 27 detects die cavity reaches setting value, with regard to the action of the extrusion mold filling of complete cost process, proceed to next step therewith.
As shown in Figure of description 5,4. for moulding process of the present invention walk.In this step, hydraulic pressure envelope mouth 1 is still in the state opening injection material road.After the action of the extrusion mold filling of complete cost process, pressure oil enters the rodless cavity of cylinder body, piston 18 is promoted to travel forward, piston rod 12, stopper head 22 is driven to move forward, extruding sizing material forms injection pressure, due to the one-way flow effect of check valve 5, melted sizing material can only enter mould cavity by hydraulic pressure envelope mouth 1 injection, complete storing mold filling, pressurize action.In this step, during due to storing mold filling, pressurize, in die cavity, form the highest pressure, by finer and close for the organizational structure making goods.After completing storing mold filling, pressurize, proceed to next step.
As shown in Figure of description 6,5. for moulding process of the present invention walk.4. walking through the, goods are proceeded to cooling and shaping by pressurize, then open mould, take out plastic 28.So far, complete plastic injection goods are complete, and return again to the and 1. walk, and enter next article manufacturing cycle.
Embodiment enumerated above is only used for the convenient illustration present invention, not the present invention is made any pro forma restriction, Shooting Technique applied technical field belonging to any has usually intellectual, if in the range of without departing from the carried technical characteristic of the present invention, disclosed technology contents is utilized to be made the Equivalent embodiments that local is changed or modified, and without departing from the technical characteristic content of the present invention, all still fall within the range of the technology of the present invention feature.
Claims (8)
1. the injection mechanism of a super large injection volume, it is characterized in that: this mechanism is made up of a plastifying organization (101) and an injection mechanism (102), the rubber melting cylinder of plastifying organization (101) turns on the accumulator pipeline of injection mechanism (102), it is provided with check valve, the accumulator of injection mechanism (102) be provided with injection nozzle and the mould (103) of band hydraulic pressure envelope mouth injection orifice can close contacting fit turning on, the injection orifice of described mould is provided with cavity pressure sensor (27)；Described plastifying organization (101) includes motor (16), hopper (15), power transmission shaft (14), connects seat (13), rubber melting cylinder (8), screw rod (7) and connector (6), check valve (5) and transition body (4)；Described injection mechanism (102) includes head connected body (2), accumulator (3), material cylinder bearing (9), accumulator flange (10), guide pillar (11), piston rod (12), oil cylinder front cover (17), piston (18), cylinder support (19), oil cylinder (20), oil cylinder bonnet (21) and stopper head (22)；Described connector (6) is connected by transition body (4) and accumulator (3) are fixing and turn on, check valve (5) is arranged between connector (6) and transition body (4), described connector (6) and motor (16) are separately positioned on rubber melting cylinder (8) rear and front end, screw rod (7) is located in rubber melting cylinder (8), its rear end interlocks with motor (16), and hopper (15) is arranged between rubber melting cylinder (8) and motor (16) and is positioned on guide pillar (11) by connection seat (13)；Being connected by guide pillar (11) between described accumulator (3) and oil cylinder (20) and be positioned on guide rod (23) by material cylinder bearing (9) and cylinder support (19), stopper head (22) and the piston (18) of oil cylinder (20) in accumulator (3) are interlocked by piston rod (12).
The injection mechanism of super large injection volume the most according to claim 1, it is characterised in that: described mould (103) is made up of dynamic model (25), cover half (26), and sprue gate is arranged on cover half (26).
3. the extruding technique of super-large size plastic goods, it is characterized in that: extruding super-large size plastic goods use the arbitrary described injection mechanism of claim 1 to 2, including following technological process: 1. mold-locked, the plastifying organization of nozzle hole and mould injection orifice close contacting fit → 2. is to accumulator storing → the most directly extrude mold filling, die cavity sizing material reaches cavity pressure sensor settings pressure → 4. accumulator injection pressurize feeding → 5. take out goods, by above-mentioned five steps, just constitute an injection cycle；Complete a large-scale or production for ultra-large type injection-molded item, return the and 1. walk, restart next product molding；Described flow process 1. in the injection orifice of injection nozzle and mould (103) of accumulator of injection mechanism (102) can close contacting fit turning on, described flow process 2. described in the accumulator of injection mechanism (102) that turned on by pipeline of the rubber melting cylinder of plastifying organization (101) be full of melten gel, described flow process 3. described in the rubber melting cylinder of plastifying organization (101) make accumulator storing continue melted sizing material after being full of melten gel in injection nozzle is directly squeezed into the die cavity of mould (103), squeezing to cavity pressure sensor (27) sets solution pressure and completes extrude mold filling action and stop melten gel.
The extruding technique of super-large size plastic goods the most according to claim 3, it is characterised in that: step 1., dynamic model (25) mobile to cover half (26), mold-locked, nozzle hole and mould injection orifice close contacting fit.
The extruding technique of super-large size plastic goods the most according to claim 3, it is characterised in that: step 2., molten plastic enter accumulator, heat mould；Complete set of equipments hydraulic pressure envelope mouth seals nozzle hole, and plastifying organization is under screw rod shearing and heating collar heat effect, and plastics are melted；Owing to the turning effort of screw rod promotes melted sizing material, enter accumulator；When storing reaches setting position, completing, to accumulator storing action, heating mould while accumulator storing, when completing accumulator storing and mould reaches to set heating-up temperature, this step action completes, and enters next step.
The extruding technique of super-large size plastic goods the most according to claim 3, it is characterized in that: step 3., extrusion mold filling, when completing after the work of accumulator storing and mould heating reach to set heating-up temperature, open hydraulic pressure envelope mouth, melted sizing material is squeezed into the die cavity of mould, in die cavity, clamp-ons sizing material melt body pressure when reaching preset value, complete to extrude mold filling action, and stop melten gel, enter next step.
The extruding technique of super-large size plastic goods the most according to claim 3, it is characterized in that: step 4., storing mold filling, pressurize, after extrusion mold filling action completes, plunger in accumulator is under the promotion of cylinder piston rod, melted sizing material in extruding accumulator, owing to piston is provided that higher dwell pressure, complete pressurize feeding.
The extruding technique of super-large size plastic goods the most according to claim 3, it is characterised in that: step 5., goods cooling and shaping in a mold and open mould and take out goods, after pressurize completes, cooling and shaping goods, after goods sizing, open mould, take out goods.
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| CN104827635B (en) * | 2015-04-15 | 2017-06-13 | 浙江申达机器制造股份有限公司 | One kind combination two steps type injection mechanism and its injection molding technique |
| CN105108987A (en) * | 2015-08-24 | 2015-12-02 | 宁波双马机械工业有限公司 | On-line mixing injection molding device |
| CN105108984A (en) * | 2015-08-24 | 2015-12-02 | 宁波双马机械工业有限公司 | Conversion valve device of on-line mixing injection molding machine and control method of conversion valve device |
| CN108099140A (en) * | 2017-12-12 | 2018-06-01 | 刘镇江 | Two-stage injection device |
| CN108340535A (en) * | 2018-04-13 | 2018-07-31 | 高密三维数控机械有限公司 | A kind of large capacity rubber injection machine |
| CN110039735A (en) * | 2019-05-22 | 2019-07-23 | 上海邦临机械设备有限公司 | A kind of melting injection integral structure |
| CN110789080B (en) * | 2019-11-12 | 2022-06-03 | 山东东宏管业股份有限公司 | Production device, production method and application of connecting pipe fitting of plastic composite pipe |
| CN113579196A (en) * | 2021-07-15 | 2021-11-02 | 伯乐智能装备有限公司 | Method for manufacturing light alloy modified product |
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Inventor after: Li Xiangdong Inventor after: Zhang Chunlin Inventor after: Dong Pengju Inventor after: Chen Zhixiong Inventor after: Liang Zhansheng Inventor before: Li Xiangdong Inventor before: Wang Ande Inventor before: Zhang Chunlin Inventor before: Dong Pengju Inventor before: Chen Zhixiong Inventor before: Liang Zhansheng |
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