CN102275274A - Injection mechanism with ultrahigh injection volume and squeezing molding technology of ultra-large plastic products - Google Patents

Injection mechanism with ultrahigh injection volume and squeezing molding technology of ultra-large plastic products Download PDF

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Publication number
CN102275274A
CN102275274A CN2011101251732A CN201110125173A CN102275274A CN 102275274 A CN102275274 A CN 102275274A CN 2011101251732 A CN2011101251732 A CN 2011101251732A CN 201110125173 A CN201110125173 A CN 201110125173A CN 102275274 A CN102275274 A CN 102275274A
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injection
accumulator
mould
super
goods
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CN102275274B (en
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李向东
王安德
张春林
董鹏举
陈志雄
梁展升
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Donghua Machinery Co Ltd
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Donghua Machinery Co Ltd
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Abstract

The invention relates to an injection mechanism with ultrahigh injection volume and a squeezing molding technology of ultra-large plastic products. The injection mechanism comprises a plasticizing mechanism and an injecting mechanism, wherein a storage tank of the injecting mechanism is provided with an injecting nozzle provided with a hydraulic seal, the injecting nozzle can be tightly contacted, matched and communicated with an injecting hole of the mold, a plasticizing tube of the plasticizing mechanism is used for directly squeezing smelted glue into the cavity of the mold by the injecting nozzle through the storage tank of the injecting mechanism with communicated pipelines, and a cavity pressure sensor is arranged in the injecting hole of the mold. The injection molding mechanism disclosed by the invention is used for molding ultra-large plastic products in a squeezing way, and is applied to ultra-large plastic injection molding machines; and the single plasticizing mechanism and the single injecting mechanism solves the technical problem of injection molding of ultra-large plastic products with ultrahigh injection volume.

Description

The extruding technology of the injection mechanism of super large injection volume and super-large size plastic goods
Technical field
The present invention relates to screw rod plunger type injection (mo(u)lding) machine and penetrate the injection machine of platform structure, relate in particular to the extruding technology of the injection mechanism and the super-large size plastic goods of super large injection volume.
Background technology
Along with Urbanization in China is accelerated, in municipal pipeline facility, communal facility, and modern industry has the trend that constantly rises to the plastic products demand than big appearance and size.The profile of plasthetics increases, and its weight also correspondingly develops into the hundreds of kilogram from several kilograms.For example, be widely used in the PE pipe fitting of industries such as natural gas, feedwater, building materials, hydroelectric project, its weight has reached the hundreds of kilogram.Tackle the development of this industrial requirement, common solution is to adopt screw rod plunger type injection structure now, utilizes the mode of accumulator to improve disposable injection volume.The defective of this scheme is the weight increase along with goods, and the diameter of its accumulator, injection stroke are with increasing.For example, the PE pipe fitting of 20 myriagrams that weigh requires disposable injection volume will reach about 23 myriagrams during its injection moulding, could moulded products.The internal diameter of producing the accumulator of this PE pipe fitting reaches 400mm, and injection stroke will reach 2000mm, and the processing and manufacturing cost of this accumulator is very high, and the difficulty of processing of this part is also very big, and general factory can't reach production requirement.The applicant's the patent No. is to disclose a kind of screw rod plunger type plastic-injection moulding machine injection structure in the patent of ZL 200720059325.2, but can't satisfy the injection volume of super-large size plastic injection moulding machine, if the size of this mechanism is strengthened, then all supporting element sizes all need strengthen, as the overstriking screw rod, strengthen melten gel motor or the like, large-scale parts difficulty of processing is big, cost is high, cause the cost of entire equipment high, have shortcomings such as complex structure.Tackle the development of current this industrial requirement, current structural design can't satisfy the needs of plastic shaping industrial development, be necessary to develop high injection amount injection machine more can be provided penetrate the platform structure.On the basis of this patent, the injection moulding mechanism that the applicant has proposed to use subpost plug cylinders such as principal post plug cylinder of above-mentioned patent and three or five, six to form again, determine the quantity of suitable subpost plug cylinder according to the size of injection volume, solved the working ability problem of plastic-injection moulding machine processing super large plastic products.Their common technology all is when plasticizing, hydraulic pressure envelope mouth closed injection material road.Plasticizing apparatus is melten gel (also successively melten gel) simultaneously, constantly the fusion sizing material is stored in the accumulator, form melten gel pressure, and promote stopper head, stopper head rollback separately, and drive piston rod piston, piston rod piston rollback, when required sizing material is expired in storage, promptly finish and just inject after melten gel moves; During injection, hydraulic pressure envelope mouth is opened injection material road.Pressure oil enters in the oil cylinder chamber, and promotion piston piston rod, notes chock plug move forward, and push the fusion sizing material in the secondary accumulator, form injection pressure, push check valve open, and the fusion sizing material enters in the main accumulator by connector; Because stopper head can not retreat, and can only seal mouth by hydraulic pressure from the fusion sizing material in the secondary accumulator and inject in the mould.After treating that the injection of fusion sizing material is finished in the secondary accumulator, pressure oil enters in the oil cylinder, and promotion piston piston rod, injection head move forward, and push the fusion sizing material in the main accumulator, form injection pressure; Because the one-way function of check valve, sizing material can not flow to secondary accumulator, can only seal mouth by hydraulic pressure and inject mould, is also finished the pressurize work of molding at last by main accumulator.Wherein, the melten gel amount in rubber melting cylinder and the accumulator and by realizing that by compression pump or oil cylinder control injection pressure injection volume wherein can only be compression pump or the estimation substantially of oil cylinder control injection pressure, has the coarse drawbacks limit of injection volume; Simultaneously, if product weight further increases again, the diameter of its accumulator or length will further increase or realize by the frame mode of the secondary accumulator of combination, to cause part to process, can not produce corresponding injection device, and have shortcomings such as complex structure, also just can not produce the injecting products of the hundreds of kilogram that weighs.Be subjected to the restriction of equipment, can not produce the ultra-large type injected articles.The present invention provides a kind of extruding technology of novelty for removing this kind restriction for the ultra-large type molding process of injection.
Summary of the invention
The present invention wants the technical solution problem to provide a kind of injection mechanism with super large injection volume simple and compact for structure.
For solving the problems of the technologies described above, the injection mechanism of a kind of super large injection volume of the present invention, this mechanism is made of a plastifying organization and an injection mechanism, the rubber melting cylinder of plastifying organization is by the accumulator pipeline conducting of injection mechanism, wherein be provided with check valve, the injection orifice that the accumulator of injection mechanism is provided with band hydraulic pressure envelope mouth can closely contact cooperation and conducting with the injection orifice of mould, is provided with the cavity pressure sensor in the injection orifice of its described mould.
The injection mechanism of above-mentioned super large injection volume, the described injection molding that waters is made of dynamic model, cover half, and described sprue gate is arranged on the cover half.
The injection mechanism of above-mentioned super large injection volume, described plastifying organization comprise motor, hopper seat, power transmission shaft, Connection Block, rubber melting cylinder, screw rod and connector, check valve and transition body; Described injection mechanism comprises head connected body, accumulator, material cylinder bearing, accumulator flange, guide pillar, piston rod, oil cylinder protecgulum, piston, cylinder support, oil cylinder, oil cylinder bonnet and stopper head; Described connector is fixedlyed connected and conducting with accumulator by the transition body, check valve is arranged between connector and the transition body, described connector and motor are separately positioned on the rubber melting cylinder rear and front end, screw rod is located in the rubber melting cylinder, its rear end and motor interlock, and the hopper seat is arranged between rubber melting cylinder and the motor and is positioned on the guide pillar by Connection Block; Be positioned on the guide rod by the guide pillar connection and by material cylinder bearing and cylinder support between described accumulator and the oil cylinder, the stopper head in the accumulator and the piston of oil cylinder are by the piston rod interlock.
The present invention is owing to adopt technique scheme, solution pressure wherein by injecting by plastifying organization in the cavity pressure sensor settings die cavity that in the injection orifice of mould, is provided with, accurately control according to the solution force value that the die cavity size designs, change in the conventional art and realize by the melten gel amount in compression pump or oil cylinder control rubber melting cylinder and the accumulator with by its injection pressure, injection volume wherein can only be the defective of estimation substantially, realize the accurate and omnidistance pressure controlled technique effect of pressure control, solve the working ability problem of plastic-injection moulding machine processing super large plastic products, the injector structure that constitutes simplification by single plastifying organization and single injection mechanism realizes the technique effect of the injection moulding super-large size plastic goods of super large injection volume.The present invention compared with prior art has simple in structure, the low processing cost of entire equipment, reduces the physical dimension of parts, and is simple in structure, helps parts processing and production, reduces cost.
The present invention will solve the technical problem that is made of the injection moulding super-large size plastic goods of realizing the super large injection volume above-mentioned single plastifying organization and single injection mechanism, the extruding technology of a kind of super-large size plastic goods of the present invention, its extruding super-large size plastic goods use above-mentioned injection moulding mechanism, comprise following technological process: 1. mold-locked, nozzle hole and mold injects hole closely contact the plastifying organization of cooperation → 2. to accumulator storing → 3. directly extrude mold filling, the die cavity sizing material reaches solution pressure sensor setting pressure → 4. accumulator injection pressurize feeding → 5. take out goods, by above-mentioned five steps, just constituted an injection cycle; Finish the production of a large-scale or ultra-large type injection-molded item, returned for the 1. step, restarted next product molding; The described flow process 1. injection nozzle of the accumulator of middle injection mechanism can closely contact cooperation and conducting with the injection orifice of mould, described flow process 2. described in the accumulator of rubber melting cylinder by the injection mechanism of pipeline conducting of plastifying organization be full of melten gel, described flow process 3. described in the rubber melting cylinder of plastifying organization continue the fusion sizing material directly is squeezed in the die cavity of mould through injection nozzle after making the accumulator storing be full of melten gel, squeeze note to cavity pressure sensor settings solution pressure is finished and is extruded the mold filling action and stop melten gel.
The extruding technology of above-mentioned a kind of super-large size plastic goods, described step 1., at first dynamic model, the cover half of moulded products, under the clamping mechanism effect of injection (mo(u)lding) machine, locking is moving, cover half, finishes the locked mode action; Under the drive of penetrating the platform mobile device, nozzle and hydraulic pressure envelope mouth are closely contacted cooperation with cover half.
The extruding technology of above-mentioned a kind of super-large size plastic goods, described step 2., the accumulator storing, hydraulic pressure envelope mouth is sealed injection material road, sizing material after the plasticizing is under extrusion screw rod promotes, flow to connector, in connector, constantly the fusion sizing material is accumulated certain pressure pusher opening one-way valve, the transition body of flowing through arrives accumulator.Constantly flow into accumulator fusion sizing material,, behind the accumulation certain pressure, promote stopper head and retreat because of not going out by the past surface current.Stopper head retreats, and drive piston rod, piston retreat, and reach preset value up to storing, finish at the accumulator storing.With to mold heated, reach design temperature.Wherein seal front end material road by hydraulic pressure envelope mouth, the fusion sizing material that plastifying organization produces passes through connector, check valve, transition body, enters accumulator, and storing in accumulator when treating storing to desired location, is finished the storing in accumulator earlier; And in the accumulator storing,, make mould reach preset temperature to mold heated.When mold temperature does not influence product molding, also can be not specially to mold heated.
The extruding technology of above-mentioned a kind of super-large size plastic goods, described step 3., extrude mold filling, when finish to the work of accumulator storing and mold heated reach set heating-up temperature after, hydraulic pressure envelope mouth is opened the material road, the fusion sizing material is extruded in the die cavity through check valve, transition body, storing, hydraulic pressure envelope mouth by connector.When treating to clamp-on in the die cavity sizing material and melting body pressure and reach preset value, finish and extrude the mold filling action, and stop melten gel, enter next step.
The extruding technology of above-mentioned a kind of super-large size plastic goods, described step 4., hydraulic pressure envelope mouth still is in the state of opening injection material road, pressure oil enters the rodless cavity of oil cylinder, promote piston advances forward, drive piston rod, stopper head move forward, and the extruding sizing material forms injection pressure, because the one-way flow effect of check valve, the fusion sizing material can only seal the mouth injection by hydraulic pressure and enter die cavity, finishes storing mold filling, pressurize action.
The extruding technology of above-mentioned a kind of super-large size plastic goods, described step 5., plastic products change cooling and shaping over to by pressurize, opens mould then, takes out plastic products, so far finish a product molding, return the 1. stepping go into next production of articles circulation.
Extruding technology of the present invention, be with the major different of other Shooting Technique: the required most of sizing material of moulded products from step in the technology of the present invention 3., after making the accumulator storing be full of melten gel, the rubber melting cylinder of realizing plastifying organization described in described flow process 3. continues the fusion sizing material directly is squeezed in the die cavity of mould through injection nozzle, squeeze note to cavity pressure sensor settings solution pressure is finished and is extruded the mold filling action and stop melten gel, solution pressure wherein by injecting by plastifying organization in the cavity pressure sensor settings die cavity that in the injection orifice of mould, is provided with, accurately control according to the solution force value that the die cavity size designs, change in the conventional art and realize by the melten gel amount in compression pump or oil cylinder control rubber melting cylinder and the accumulator with by its injection pressure, injection volume wherein can only be the defective of estimation substantially, realize the accurate and omnidistance pressure controlled technique effect of pressure control, 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 height saving that has realized energy consumption and the technique effect of simplifying injection technique.
Description of drawings
Below in conjunction with the embodiment in the accompanying drawing the present invention is described in further detail, but does not constitute any limitation of the invention.
Fig. 1 process flow diagram of the present invention;
Fig. 2 processing step of the present invention 1. the time technology penetrate platform user mode structural representation;
Fig. 3 processing step of the present invention 2. the time technology penetrate platform user mode structural representation;
Fig. 4 processing step of the present invention 3. the time technology penetrate platform user mode structural representation;
Fig. 5 processing step of the present invention 4. the time technology penetrate platform user mode structural representation;
Fig. 6 processing step of the present invention 5. the time technology penetrate platform user mode structural representation.
The specific embodiment
Shown in Fig. 1~6, the injection mechanism of a kind of super large injection volume of the present invention, this mechanism is made of a plastifying organization 101 and an injection mechanism 102, the injection nozzle that the accumulator of injection mechanism 102 is provided with band hydraulic pressure envelope mouth can closely contact cooperation and conducting with the injection orifice of mould 103, the rubber melting cylinder of plastifying organization 101 directly is squeezed into the fusion sizing material among the die cavity A of mould 103 through injection nozzle by the accumulator of the injection mechanism 102 of pipeline conducting, is provided with cavity pressure sensor 27 in the injection orifice of mould;
Mould 103 is made of dynamic model 25, cover half 26, and the sprue gate is arranged on the cover half 26;
Plastifying organization 101 comprises motor 16, hopper seat 15, power transmission shaft 14, Connection Block 13, rubber melting cylinder 8, screw rod 7 and connector 6, check valve 5 and transition body 4; Injection mechanism 102 comprises head connected body 2, accumulator 3, material cylinder bearing 9, accumulator flange 10, guide pillar 11, piston rod 12, oil cylinder protecgulum 17, piston 18, cylinder support 19, oil cylinder 20, oil cylinder bonnet 21 and stopper head 22; Connector 6 is fixedlyed connected and conducting with accumulator 3 by transition body 4, check valve 5 is arranged between connector 6 and the transition body 4, connector 6 and motor 16 are separately positioned on rubber melting cylinder 8 rear and front ends, screw rod 7 is located in the rubber melting cylinder 8, its rear end and motor 16 interlocks, and hopper seat 15 is arranged between rubber melting cylinder 8 and the motor 16 and is positioned on the guide pillar 11 by Connection Block 13; Be positioned on the guide rod 23 by guide pillar 11 connections and by material cylinder bearing 9 and cylinder support 19 between accumulator 3 and the oil cylinder 20, stopper head 22 in the accumulator 3 and the piston of oil cylinder 20 18 are by piston rod 12 interlocks.
Utilize above-mentioned injection structure, cooperate the clamping mechanism of injection (mo(u)lding) machine and other parts, mould etc. to constitute an injection molding apparatus again.Shown in Figure of description 2, dynamic model 25, cover half 26, cavity pressure sensor 27.This moulding process the 1. the step is: utilize the clamping mechanism of injection (mo(u)lding) machine,, nozzle closely contacted cooperation with mould with penetrating the platform mobile device with mold-locked.Its role is to, the Jiao Kou of injection structure material road and mould is linked up, form the cavity volume of a closure.
Shown in Figure of description 3, be the 2. step of moulding process of the present invention.In this step, when plastics plastified, hydraulic pressure envelope mouth 1 was sealed injection material road, and, the fusion sizing material can not seal mouth 1 outflow by hydraulic pressure during the plastics plasticizing yet.Sizing material after the plasticizing flows to connector 6 under extrusion screw rod 7 promotes, in connector 6, constantly fusion sizing material accumulation certain pressure pusher opening one-way valve 5, and the transition body 4 of flowing through arrives accumulator 3.Constantly be squeezed into accumulator 3 fusion sizing materials,, behind the accumulation certain pressure, promote stopper head 22 and retreat because of not going out by the past surface current.Stopper head 22 retreats, and drive piston rod 12, piston 18 retreat, and reach preset value up to storing, finish the storing in accumulator.In the accumulator storing, after heating mould reaches design temperature, finish the 2. step of this technology, enter next step.
Shown in Figure of description 4, be the 3. step of moulding process of the present invention.In this step, plastifying organization continues the plasticizing sizing material, and hydraulic pressure envelope mouth 1 is opened injection material road, plasticizing sizing material well forms certain pressure, the connector 6 of flowing through under extrusion screw rod 7 promotes, open check valve 5,, be extruded in the die cavity by transition body 4, accumulator 3, nozzle and hydraulic pressure envelope mouth 1.At this moment, sizing material still remains molten condition in die cavity, along with clamp-oning increasing of sizing material, pressure in die cavity will raise gradually, when cavity pressure sensor 27 detects pressure in the die cavity and reaches setting value, just finish the action of extruding mold filling of this technology, change next step over to thereupon.
Shown in Figure of description 5, be the 4. step of moulding process of the present invention.In this step, hydraulic pressure envelope mouth 1 still is in the state of opening injection material road.After finishing the action of extruding mold filling of this technology, pressure oil enters the rodless cavity of cylinder body, promoting piston 18 travels forward, drive piston rod 12, stopper head 22 move forward, the extruding sizing material forms injection pressure, because the one-way flow effect of check valve 5, the fusion sizing material can only seal mouth 1 injection by hydraulic pressure and enter mould cavity, finishes storing mold filling, pressurize action.In this step, in die cavity, form very high pressure during owing to storing mold filling, pressurize, will make the institutional framework of goods fine and close more.After finishing storing mold filling, pressurize, change next step over to.
Shown in Figure of description 6, be the 5. step of moulding process of the present invention.Through the 4. step, goods change cooling and shaping over to by pressurize, open mould then, take out plastic products 28.So far, a complete plastics injected articles is finished, and forwards for the 1. step again to, enters the next production of articles cycle.
More than cited embodiment only be used for conveniently illustrating the present invention, be not that the present invention is done any pro forma restriction, have in the Shooting Technique applied technical field under any and know the knowledgeable usually, if in the scope that does not break away from technical characterictic that the present invention carries, utilize disclosed technology contents to make the local equivalent embodiment that changes or modify, and do not break away from technical characterictic content of the present invention, all still belong in the scope of the technology of the present invention feature.

Claims (10)

1. the injection mechanism of a super large injection volume, it is characterized in that: this mechanism is made of a plastifying organization (101) and an injection mechanism (102), the accumulator pipeline conducting of the rubber melting cylinder of plastifying organization (101) and injection mechanism (102), wherein be provided with check valve, the injection nozzle that the accumulator of injection mechanism (102) is provided with band hydraulic pressure envelope mouth can closely contact cooperation and conducting with the injection orifice of mould (103), is provided with cavity pressure sensor (27) in the injection orifice of described mould.
2. the injection mechanism of super large injection volume according to claim 1 is characterized in that: described mould (103) is made of dynamic model (25), cover half (26), and described sprue gate is arranged on the cover half (26).
3. the injection mechanism of super large injection volume according to claim 1 is characterized in that: described plastifying organization (101) comprises motor (16), hopper seat (15), power transmission shaft (14), Connection Block (13), rubber melting cylinder (8), screw rod (7) and connector (6), check valve (5) and transition body (4); Described injection mechanism (102) comprises head connected body (2), accumulator (3), material cylinder bearing (9), accumulator flange (10), guide pillar (11), piston rod (12), oil cylinder protecgulum (17), piston (18), cylinder support (19), oil cylinder (20), oil cylinder bonnet (21) and stopper head (22); Described connector (6) is fixedlyed connected and conducting with accumulator (3) by transition body (4), check valve (5) is arranged between connector (6) and the 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 the rubber melting cylinder (8), its rear end and motor (16) interlock, and hopper seat (15) is arranged between rubber melting cylinder (8) and the motor (16) and is positioned on the guide pillar (11) by Connection Block (13); Be positioned on the guide rod (23) by guide pillar (11) connection and by material cylinder bearing (9) and cylinder support (19) between described accumulator (3) and the oil cylinder (20), the stopper head (22) in the accumulator (3) and the piston (18) of oil cylinder (20) are by piston rod (12) interlock.
4. the extruding technology of super-large size plastic goods, it is characterized in that: extruding super-large size plastic goods use the described injection moulding of claim 1 to 3 mechanism, comprise following technological process: 1. mold-locked, nozzle hole and mold injects hole closely contact the plastifying organization of cooperation → 2. to accumulator storing → 3. directly extrude mold filling, the die cavity sizing material reaches solution pressure sensor setting pressure → 4. accumulator injection pressurize feeding → 5. take out goods, by above-mentioned five steps, just constituted an injection cycle; Finish the production of a large-scale or ultra-large type injection-molded item, returned for the 1. step, restarted next product molding; The described flow process 1. injection nozzle of the accumulator of middle injection mechanism (102) can closely contact cooperation and conducting with the injection orifice of mould (103), described flow process 2. described in the accumulator of rubber melting cylinder by the injection mechanism (102) of pipeline conducting of plastifying organization (101) be full of melten gel, described flow process 3. described in the rubber melting cylinder of plastifying organization (101) continue the fusion sizing material directly is squeezed in the die cavity of mould (103) through injection nozzle after making the accumulator storing be full of melten gel, squeeze note to cavity pressure sensor (27) is set solution pressure and is finished and extrude the mold filling action and stop melten gel.
5. the extruding technology of super-large size plastic goods according to claim 4 is characterized in that: step is 1., dynamic model (25) moves to cover half (26), mold-locked, and the nozzle hole closely contacts cooperation with the mold injects hole;
6. according to the extruding technology of the described super-large size plastic goods of claim 1, it is characterized in that: step 2., molten plastic enters accumulator, heating mould; Complete set of equipments hydraulic pressure envelope mouth is sealed the nozzle hole, and plastifying organization is under screw rod shearing and heating collar heat effect, and plastics are melted; Because the turning effort of screw rod promotes the fusion sizing material, enters accumulator; When storing reaches desired location, finish to accumulator storing action, at heating mould in the accumulator storing, reach when setting heating-up temperature finishing accumulator storing and mould, this step moves and finishes, and enters next step.
7. according to the extruding technology of the described super-large size plastic goods of claim 1, it is characterized in that: step 3., extrude mold filling, when finish to the work of accumulator storing and mold heated reach set heating-up temperature after, open hydraulic pressure envelope mouth, the fusion sizing material is squeezed into the die cavity of mould, when treating to clamp-on in the die cavity sizing material and melting body pressure and reach preset value, finishes and extrude the mold filling action, and stop melten gel, enter next step.
8. according to the extruding technology of the described super-large size plastic goods of claim 1, it is characterized in that: step 4., storing mold filling, pressurize, when extruding after mold filling action finishes, plunger in the accumulator is under the promotion of oil cylinder piston bar, fusion sizing material in the extruding accumulator, because piston can provide higher dwell pressure, finishes the pressurize feeding.
9. according to the extruding technology of the described super-large size plastic goods of claim 1, it is characterized in that: step 5., goods cooling and shaping and open mould and take out goods in mould, after pressurize is finished, the cooling and shaping goods, after the goods typing, open mould, take out goods.
10. according to the extruding technology of the described super-large size plastic goods of claim 1, it is characterized in that: the required most of sizing material of moulded products is from the 3. step in the technology of the present invention.
CN201110125173.2A 2011-05-15 2011-05-15 The injection mechanism of super large injection volume and the extruding technique of super-large size plastic goods Active CN102275274B (en)

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CN106042259A (en) * 2015-08-24 2016-10-26 宁波双马机械工业有限公司 Online mixing injection-molding 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
CN110789080A (en) * 2019-11-12 2020-02-14 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

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