CN105172093A - Double-gas-assisted extrusion molding device and method for plastic microtubes - Google Patents
Double-gas-assisted extrusion molding device and method for plastic microtubes Download PDFInfo
- Publication number
- CN105172093A CN105172093A CN201510394781.1A CN201510394781A CN105172093A CN 105172093 A CN105172093 A CN 105172093A CN 201510394781 A CN201510394781 A CN 201510394781A CN 105172093 A CN105172093 A CN 105172093A
- Authority
- CN
- China
- Prior art keywords
- gas
- auxiliary
- microtubule
- neck ring
- pressure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/50—Details of extruders
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/30—Extrusion nozzles or dies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92009—Measured parameter
- B29C2948/92209—Temperature
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses a double-gas-assisted extrusion molding device and method for plastic microtubes. The device is composed of an extruder, a microtube extrusion die, a gas assisting system and a control system. Compared with similar plastic extrusion molding devices, double-gas-assisted extrusion of the inner and outer wall faces of plastic microtubes can be achieved, and therefore the problems of extrusion swelling, melt fracture, distortion and the like can be well eliminated. Meanwhile, by the adoption of the real-time data collection and precision control technology, the extrusion stability is higher.
Description
Technical field
The invention belongs to high molecule plastic extrusion molding manufacture field, be specifically related to a kind of two gas-assisted extrusion devices and methods therefors of plastic micro.
Background technology
In plastic products, plastic micro has wide application market, as: interposing catheter medically and industrial spool etc.Usually, these microtubules be by extruder by the plastics after plasticizing and melting, extrude according to the microtubule extrusion neck ring mold runner of certain shape of cross section, then the available goods of final formation after supercooling, sizing, traction and cutting.But in extrusion, the quality of goods final mass is subject to multifactorial impact perhaps, and its major influence factors has: the height of one, plastic melt itself sticks the characteristics such as bullet, crystallization and molecularly oriented; Two, the impact of the working process parameter such as screw speed, melt temperature, mold temperature, chilling temperature, gas injection pressure, hauling speed; Three, mould flow passage structure parameter.The impact of these many factors, add melt in an extruder under helical screw agitator, compression and shear action, and in microtubule extrusion neck ring mold stretch and shear action under, melt produces larger Pressure Drop, tensile stress and shear stress, melt is made to create larger molecularly oriented effect, elastic energy storage effect and normal stress effect, and then melt produces the unstability such as pressure oscillation, finally makes the plastic products be extruded easily produce the problems such as extrusion swelling, melt fracture, torsional deformation.In actual plastic processing is produced, for the microtubule of a certain size, its working process parameter is all often got by a large amount of trial-and-error methods, causes the waste of great human and material resources and financial resources.And for the good microtubule of some application prospects, the internal business secret of the physical dimension of its extrusion die and working process parameter Dou Shi enterprise, makes other enterprises and processor cannot shared resource.Much research and experiment show, the adhesive force of melt and microtubule extrusion neck ring mold wall has a great impact tools such as extrusion swelling, melt fracture and torsional deformations; And, microtubule is extruded and is different from extruding of traditional piping material, due to the reduction of microtubule characteristic size and the increase of table body ratio, the roughness of microtubule extrusion neck ring mold wall is made to show more outstanding, melt to stick resistance stronger, make in extrusion, to need higher pressure, and the lifting of pressure is extruded problem to extrusion swelling, melt fracture and torsional deformation etc. and can be caused direct impact.And, for plastic micro is extruded, melt is in microtubule extrusion neck ring mold runner, except there is the contact of melt outside wall surface and microtubule extrusion neck ring mold wall, also and between one or more plug wall there is adhesion contact in the inside of melt, the problems such as the extrusion swelling of microtubule, melt fracture and torsional deformation is given prominence to more and is difficult to control.Therefore, how to overcome during microtubule extrudes, the friction of melt and microtubule extrusion neck ring mold wall and plug wall and stick degree, become and overcome the key that microtubule extrudes problem.
Summary of the invention
The object of the invention is two gas-assisted extrusion devices that a kind of plastic micro is provided for the deficiencies in the prior art, additionally provide the method for this gas-assisted extrusion applicable simultaneously.
Two gas-assisted extrusion devices of plastic micro of the present invention are made up of extruder, microtubule extrusion neck ring mold, gas accessory system and control system; Wherein, extruder is singe screw or double screw extruder, is made up of the machine barrel of dynamical system, feed hopper, screw rod, band heating collar, cross-head and extruder controller; Microtubule extrusion neck ring mold, along melt flows direction, by head connecting plate, pressing plate, bolt, handpiece body, interior gas auxiliary ventilation bolt, spreader, shunting support, plug, microtubule extrusion neck ring mold bracket, back-up ring, without gas auxiliary mouth mould, trim ring, has gas auxiliary mouth mould, air inlet mould, the auxiliary ventilation bolt of outer gas, microtubule extrusion neck ring mold heating collar and screw etc. to form; It is outer that microtubule extrusion neck ring mold heating collar is positioned at microtubule extrusion neck ring mold, is wrapped in microtubule extrusion neck ring mold and mouth mould runner, for heating microtubule extrusion neck ring mold; There is in microtubule extrusion neck ring mold a mouthful mould runner, by entrance to outlet comprise successively entrance, shunting section, flat segments, compression section, sizing without gas secondary segment, sizing have gas secondary segment;
Microtubule extrusion neck ring mold and cross-head are formed by connecting by head connecting plate, pressing plate and supporting bolt, the plastic melting physical efficiency that extruder is extruded flows into the porch of microtubule extrusion neck ring mold, then extrudes from the outlet of microtubule extrusion neck ring mold according to microtubule extrusion neck ring mold shape of cross section after microtubule extrusion neck ring mold runner.Microtubule extrusion neck ring mold handpiece body and microtubule extrusion neck ring mold bracket are fixed by back-up ring and screw; Handpiece body is fixed by bolt of ventilating with shunting support; Be fixed by trim ring and screw without the auxiliary mouth mould of gas and microtubule extrusion neck ring mold bracket; Air inlet microtubule extrusion neck ring mold with have the auxiliary mouth mould of gas to be fixed by screw; Outer gas auxiliary ventilation bolt is threaded connection fixing.
In microtubule extrusion neck ring mold, spreader and plug are fixed by screw thread and shunting support, and together constitute the wall of microtubule contact, wherein the melt entering microtubule extrusion neck ring mold is shunted by spreader, is beneficial to form hollow plastic tubing; Shunting support is on the one hand for supporting spreader and being connected plug, on the other hand for connecting the auxiliary ventilation bolt of interior gas, convenient by the hollow airway of gas auxiliary for interior gas importing plug; Compression section is used for the compacting carried out by plastic melt to a certain degree, and produces certain entrance pressure drop, is conducive to the mechanical properties such as the consolidation of the shaping rear goods of raising plastic melt.
Microtubule extrusion neck ring mold has interior gas auxiliary mouth modular system and the auxiliary mouth modular system of outer gas.Wherein, the interior gas auxiliary mouth modular system of microtubule extrusion neck ring mold is made up of the auxiliary ventilation bolt of interior gas, shunting support, spreader and plug.Further, the inside of the auxiliary ventilation bolt of interior gas, shunting support, spreader and plug has hollow airway, for the gas carrying interior gas auxiliary.Its operation principle is: the auxiliary gas of interior gas is under certain pressure effect, microtubule extrusion neck ring mold is entered by interior gas auxiliary ventilation bolt hollow airway, through the hollow airway of shunting stand connection, enter the hollow airway of plug again, flow out from the air drain of plug side again, between melt inwall and mandrel outer wall, form internal gas auxiliary layer; The outer gas auxiliary mouth modular system of microtubule extrusion neck ring mold is by outer gas auxiliary ventilation bolt, air inlet mould, has the auxiliary mouth mould of gas to form; Air inlet mould inwall and have between gas auxiliary mouth mould outer wall and stay certain space, air inlet mould, without gas auxiliary mouth mould with there is gas auxiliary mouth mould to form the auxiliary air chamber of outer gas; There are gas auxiliary mouth mould and the gap without 0.1-0.2mm reserved between the auxiliary mouth mould of gas, form the auxiliary air inlet gap of outer gas.The auxiliary operation principle of outer gas is: the auxiliary gas of outer gas is under certain pressure effect, by the hollow airway of outer gas auxiliary ventilation bolt enter air inlet mould, without gas auxiliary mouth mould and have the auxiliary mouth mould of gas to form air chamber in, then by without gas auxiliary mouth mould and there is the air inlet slit flow between the auxiliary mouth mould of gas to enter the mouth mould runner of microtubule extrusion neck ring mold, between microtubule melt outside wall surface and microtubule extrusion neck ring mold internal face, extraneous gas auxiliary layer is formed.
Gas accessory system assists Zong Lu, the auxiliary branch road of interior gas and the auxiliary branch road of outer gas to form by gas.Wherein, gas assists total curb gas flow direction to be made up of air compressor machine, air valve, rubber tubing, air accumulator, Pressure gauge, air valve, spinner instrument, air hose, gas distributing T-pipe device successively; In interior gas auxiliary route, the auxiliary gas-heating apparatus of the auxiliary pressure-reducing valve of gas, the auxiliary electromagnetic proportional valve of interior gas, the auxiliary Pressure gauge of interior gas, the auxiliary spinner flowmeter of interior gas and interior gas is formed; The auxiliary gas-heating apparatus of the outer auxiliary pressure-reducing valve of gas, the auxiliary electromagnetic proportional valve of outer gas, the auxiliary Pressure gauge of outer gas, the auxiliary spinner flowmeter of outer gas and the outer gas of outer gas auxiliary route is formed.Its operation principle and step are: first, open the draining valve bottom air accumulator, after emptying for the condensate water in air accumulator, close draining valve again; Open the air valve between air compressor machine and air accumulator, close the air valve at reservoir outlet place simultaneously; Start air compressor machine, by air compressor machine, air is compressed, open the air valve in air compressor machine exit, be delivered to air accumulator by rubber tubing and store; Can open the air valve at reservoir outlet place when the Pressure gauge at reservoir outlet place points to 0.6MPa, compressed air flows out through the pressure-reducing valve of reservoir outlet, arrives gas distributing T-pipe device carry out shunting two-way gas through air hose; Wherein a road is the auxiliary branch road of interior gas, from the wherein branch road of gas distributing T-pipe device out after, through the auxiliary pressure-reducing valve of interior gas, gas flow is controlled by the auxiliary electromagnetic proportional valve of interior gas, shown pressure and the flow of the gas that this branch road flows through by the auxiliary pressure sensor of interior gas, Pressure gauge and the auxiliary spinner flowmeter of interior gas, then enter the auxiliary gas-heating apparatus of interior gas and heat; Simultaneously, an other road is the auxiliary branch road of outer gas, from the other branch road of gas distributing T-pipe device out after, through the auxiliary pressure-reducing valve of outer gas, gas flow is controlled by the auxiliary electromagnetic proportional valve of outer gas, shown the flow of the gas that this branch road flows through by the auxiliary pressure sensor of outer gas, the outer auxiliary spinner flowmeter of gas of Pressure gauge, then enter the auxiliary gas-heating apparatus of outer gas and heat; By the gas after the additional thermal of interior gas and the auxiliary heating devices heat of outer gas, enter interior gas auxiliary mouth modular system and the auxiliary mouth modular system of outer gas by interior gas auxiliary ventilation bolt and outer gas auxiliary ventilation bolt respectively.
Control system mainly comprises melt pressure temperature sensor, extruder controller, microtubule extrusion neck ring mold temperature controller, gas temperature sensor, gas pressure sensor, gas temperature controller, electromagnetic proportional valve, A/D card, D/A card and computer and forms.Wherein, melt pressure temperature sensor is connected with microtubule extrusion neck ring mold, for measuring melt pressure in microtubule extrusion neck ring mold runner and temperature; Extruder controller is connected with extruder, for controlling extruder screw rotating speed; Microtubule extrusion neck ring mold temperature controller is connected with microtubule extrusion neck ring mold heating collar, for controlling the temperature of microtubule extrusion neck ring mold heating; Gas temperature sensor is connected with the auxiliary gas-heating apparatus of outer gas with the auxiliary gas-heating apparatus of interior gas, for the temperature after measurement gas heating; Gas pressure sensor is connected with the auxiliary gas-heating apparatus of outer gas with the auxiliary gas-heating apparatus of interior gas, for the pressure after measurement gas heating; Gas temperature controller is connected with the auxiliary gas-heating apparatus of outer gas with the auxiliary gas-heating apparatus of interior gas, for the temperature of adjustments of gas; Electromagnetic proportional valve is connected with the auxiliary branch road of outer gas with the auxiliary branch road of interior gas respectively, for regulating gas flow and the pressure of the auxiliary branch road of tow channel gas.
The present invention is except the two gas-assisted extrusion devices providing a kind of plastic micro, and also provide a kind of corresponding gas-assisted extrusion method, its method concrete steps are as follows:
(1) connect the heating collar of extruder and the power supply of microtubule extrusion neck ring mold heating collar, each section of extruder barrel and microtubule extrusion neck ring mold are heated.
(2) gas accessory system is opened, first air compressor machine is opened, then valve is opened, by air compressor machine Compressed Gas is pressed in air accumulator by air valve and rubber hose and stores, the force value in air accumulator is shown by the Pressure gauge of air accumulator, arrive after setting value until gas pressure in air accumulator, close air compressor machine and air valve.
(3) when the barrel of extruder and the heating temperatures of microtubule extrusion neck ring mold are to design temperature, in connecting, the auxiliary gas-heating apparatus of gas and the auxiliary gas-heating apparatus of outer gas, heated by the copper tube in the auxiliary gas-heating apparatus of the internal gas of resistance wire and the auxiliary gas-heating apparatus of outer gas.
(4) pressure-reducing valve of air accumulator is opened, the gas flow exported by air accumulator is shown by gas flowmeter, be split into through pressure-reducing valve, spinner instrument, air hose and gas distributing T-pipe device the conveying that two-way gas pipeline carries out the auxiliary and auxiliary gas of outer gas of interior gas from air accumulator gas out, wherein two-way pipeline is all furnished with respective pressure-reducing valve, Pressure gauge and flowmeter for controlling and show pressure and the flow of each road gas; Two-way gas is carried through appendix, enters respective gas-heating apparatus and heats, and the two-way gas after heating enters microtubule extrusion neck ring mold separately respectively by interior gas auxiliary ventilation bolt and the auxiliary ventilation bolt of outer gas, and in being formed respectively, gas is auxiliary and outer gas is auxiliary.
(5) when the barrel of extruder, after the temperature of microtubule extrusion neck ring mold and assist gas all reaches predetermined value, plastic raw materials is loaded the barrel of extruder from extruder hopper, open the power supply of extruder, running extruder screw, while plastics carry out plasticizing and melting, by extruder screw plastic melt to be stirred and rotation is delivered to cross-head, melt is under the driving of extruder screw, the entrance of microtubule extrusion neck ring mold is entered through cross-head, by the spreader in microtubule extrusion neck ring mold, melt is shunted again, melt after shunting is after shunting the flat segments of support, carry out compression to a certain degree through plug compression section again and form certain pressure, the sizing section of the auxiliary mouth mould of gas is with after flowing through the sizing section without gas auxiliary mouth mould again, due to before not having melt to flow through to have gas auxiliary mouth mould section, by gas accessory system, the gas with certain pressure and temperature is delivered to the sizing section having the auxiliary mouth mould of gas, therefore, when melt is by when being provided with gas auxiliary mouth mould section without gas auxiliary mouth mould section, gas and can have the wall of the auxiliary mouth mould of gas and plug to form gas blanket at melt, the adhesion of such melt and microtubule extrusion neck ring mold and plug wall obtains elimination, melt can be extruded from there being the sizing section of the auxiliary mouth mould of gas with piston-shaped form, thus eliminate extrusion swelling, the problem such as melt fracture and torsional deformation.
(6) in extruder running and melt extrusion process, when melt pressure or too high or too low for temperature time, the pressure and temperature of melt in microtubule extrusion neck ring mold is recorded by melt pressure temperature sensor, undertaken gathering pressure and temperature analog signal and the data signal being converted to corresponding amplitude by A/D card, computer is sent into again by data/address bus, computer contrasts according to the pressure and temperature numerical value of the melt obtained in real time and predetermined value, the controller that the difference of pressure feeds back to extruder by D/A card is regulated extruder screw rotating speed, thus regulate melt pressure by the mode controlling melt flow rate, in addition the difference of temperature is fed back to microtubule extrusion neck ring mold temperature controller by D/A card, regulated the temperature of microtubule extrusion neck ring mold heating collar by microtubule extrusion neck ring mold temperature controller.
(7) in melt extrusion and gas course of conveying, when gas pressure or too high or too low for temperature time, the analog signal of the pressure and temperature of the gas exporting heating is obtained by gas pressure and temperature sensor, gathered by A/D card again and convert the data signal of corresponding numerical value to, and input to computer by data/address bus, computer contrasts according to the gas pressure preset and temperature value, pressure difference value is fed back to by A/D card the effect that gas pressure servo valve control gas flow reaches adjustments of gas pressure, temperature gap is fed back to by A/D card the effect that the gas temperature controller resistance wire power controlled in gas-heating apparatus reaches adjustments of gas heating-up temperature simultaneously.
(8) when the flow of the flow of melt, pressure, temperature and gas, pressure and temperature are all stabilized within the parameter area of setting, the plastic micro gas-assisted extrusion device be made up of extruder, microtubule extrusion neck ring mold, gas accessory system and control system, realizes the extruding smoothly without extrusion swelling, melt fracture and torsional deformation etc. of the plastic micro of certain shape of cross section.
Compared with conventional plastic microtubule extrusion molding apparatus and method, the present invention has following beneficial effect:
(1) and effect that outer gas auxiliary auxiliary due to interior gas, gas blanket is defined at melt and microtubule extrusion neck ring mold and plug wall, what eliminate melt and microtubule extrusion neck ring mold and plug wall sticks resistance, significantly reduce the pressure of melt, shear stress, normal stress etc., melt is extruded in piston-shaped mode in microtubule extrusion neck ring mold sizing section, greatly eliminates the problems such as extrusion swelling, melt fracture and torsional deformation.
(2) as long as replaced by the plug cross section of sizing section, can realize carrying out air-assist extrusion to the plastic micro of various shape of cross section, function is more, practicality is stronger.
(3) melt pressure temperature sensor, gas pressure and temperature sensor and corresponding pressure and temperature control instrument is adopted, by the control system that A/D card and D/A card and computer are formed, various technological parameter adjustment can be carried out to the Air-Assisted Extrusion of Polymer of plastic micro, considerably increase flexibility and stability that plastic micro extrudes.
Accompanying drawing explanation
Fig. 1 is plastic micro gas-assisted extrusion device schematic diagram;
In figure, 1. extruder, 2. microtubule extrusion neck ring mold, 3. gas accessory system, 4. control system, 1-1 dynamical system, 1-2. feed hopper, 1-3. screw rod, 1-4. machine barrel, 1-5. extruder head, 1-6. extruder controller, the auxiliary branch road of gas in 302., the auxiliary branch road of 303. outer gas, 4-1. melt pressure temperature sensor.
Fig. 2 is that microtubule extrusion neck ring mold is along melt flows directional profile structure chart;
In figure, 1. extruder, 2-1. head connecting plate; 2-2. pressing plate, 2-3. bolt, 2-4. microtubule extrusion neck ring mold handpiece body; the auxiliary ventilation bolt of gas in 2-5.; 2-6. spreader, 2-7. shunts support, 2-8. plug; 2-9. microtubule extrusion neck ring mold bracket; 2-10. back-up ring, 2-11. without the auxiliary mouth mould of gas, 2-12. trim ring; 2-13. has the auxiliary mouth mould of gas; 2-14. air inlet mould, the outer auxiliary ventilation bolt of gas of 2-15., 2-16. microtubule extrusion neck ring mold heating collar; 2-17. screw; the auxiliary branch road of gas in 302., the auxiliary branch road of 303. outer gas, 4-1. melt pressure temperature sensor.
Fig. 3 a and Fig. 3 b is the plug side hollow out schematic diagram of the auxiliary mouth modular system of interior gas;
Fig. 4 is the principle schematic of gas accessory system;
In figure, 301-1. air compressor machine, 301-2. air valve, 301-3. rubber tubing, 301-4. air accumulator, 301-5. Pressure gauge, 301-6. pressure-reducing valve, 301-7. spinner instrument, 301-8. air hose, 301-9. gas distributing T-pipe device, the auxiliary pressure-reducing valve of gas in 302-1., the auxiliary electromagnetic proportional valve of gas in 302-2., the auxiliary Pressure gauge of gas in 302-3., the auxiliary spinner flowmeter of gas in 302-4., the auxiliary gas-heating apparatus of gas in 302-5., the outer auxiliary pressure-reducing valve of gas of 303-1., the outer auxiliary electromagnetic proportional valve of gas of 303-2., the outer auxiliary Pressure gauge of gas of 303-3., the outer auxiliary spinner flowmeter of gas of 303-4., the outer auxiliary gas-heating apparatus of gas of 303-5.
Fig. 5 is the principle schematic of gas-heating apparatus;
In figure, 302-4-1. copper tube, 302-4-2. resistive heater, 302-4-3. pottery short tube, 302-4-4. heat-preservation cotton, 302-4-5. glass fabric, 4-3. gas temperature sensor, 4-4. gas pressure sensor;
Fig. 6 is the principle schematic of control system.In figure, 4-1. melt pressure temperature sensor, 1-6. extruder controller, 4-2. microtubule extrusion neck ring mold temperature controller, 4-3. gas temperature sensor, 4-4. gas pressure sensor, 4-5. gas temperature controller, 302-2 and .303-2. electromagnetic proportional valve, 4-6.A/D card, 4-7.D/A card, 4-8. computer.
Detailed description of the invention
The present invention relates to a kind of two gas-assisted extrusion devices of plastic micro, this principle of device schematic diagram as shown in Figure 1.This device is made up of extruder (1), microtubule extrusion neck ring mold (2), gas accessory system (3) and control system (4).
Wherein, extruder (1) is small-sized singe screw or double screw extruder, is chosen as screw diameter 25-30mm, screw slenderness ratio 25-30:1, screw speed is that 0-25r/min is adjustable.Extruder is made up of dynamical system (1-1), feed hopper (1-2), screw rod (1-3), machine barrel (1-4), extruder head (1-5) and extruder controller (1-6), singe screw or twin-screw are installed in the machine barrel of extruder, singe screw or twin-screw are connected with dynamical system (1-1), drive singe screw or twin-screw to rotate by dynamical system (1-1).During extruder work, first extruder dynamical system (1-1) is started, and utilize heating collar to heat to each section of barrel (1-4), when barrel (1-4) each section of temperature reaches design temperature, plastic raw materials is poured in extruder barrel (1-4) by feed hopper (1-2), under the rotation environment of high temperature and screw rod (1-3), raw materials for plastics production plastify and melting fast, and by bolt rotary, plastic melt is sent to extruder head (1-5), and then enter in microtubule extrusion neck ring mold (2), extruder screw rotating speed can be regulated by extruder controller (1-6).
Fig. 2 is microtubule extrusion neck ring mold (2) structural representation.Microtubule extrusion neck ring mold (2) is along melt flows direction, primarily of head connecting plate (2-1), pressing plate (2-2), bolt (2-3), microtubule extrusion neck ring mold handpiece body (2-4), the auxiliary ventilation bolt (2-5) of interior gas, spreader (2-6), shunting support (2-7), plug (2-8), microtubule extrusion neck ring mold bracket (2-9), back-up ring (2-10), without the auxiliary mouth mould (2-11) of gas, trim ring (2-12), there is the auxiliary mouth mould (2-13) of gas, air inlet mould (2-14), the auxiliary ventilation bolt (2-15) of outer gas, the formations such as microtubule extrusion neck ring mold heating collar (2-16) and screw (2-17).
Microtubule extrusion neck ring mold (2-1) preferably can be processed through Linear cut and electric spark precision by No. 45 steel.Whole microtubule extrusion neck ring mold is wrapped up by microtubule extrusion neck ring mold heating collar (2-16), and its effect utilizes resistance wire to heat microtubule extrusion neck ring mold, makes the melt in microtubule extrusion neck ring mold runner keep certain temperature.
Microtubule extrusion neck ring mold (2) is formed by connecting by head connecting plate (2-1), pressing plate (2-2) and bolt (2-3) with the head (1-5) of extruder (1), the plastic melting physical efficiency that extruder (1) is extruded flows into the porch of microtubule extrusion neck ring mold (2), then extrudes from the outlet of microtubule extrusion neck ring mold according to microtubule extrusion neck ring mold shape of cross section after microtubule extrusion neck ring mold runner.Microtubule extrusion neck ring mold handpiece body (2-4) is fixed by back-up ring (2-10) and screw (2-17) with microtubule extrusion neck ring mold bracket (2-9); Microtubule extrusion neck ring mold handpiece body (2-4) is fixed by the auxiliary ventilation bolt (2-5) of interior gas with shunting support (2-7); Be fixed by trim ring (2-12) and screw (2-17) without the auxiliary mouth mould (2-11) of gas and microtubule extrusion neck ring mold bracket (2-9); Air inlet mould (2-14) with have the auxiliary mouth mould (2-13) of gas to be fixed by screw (2-17); The auxiliary ventilation bolt (2-15) of outer gas is connected and fixed by screw thread and air inlet mould (2-14).
Whole microtubule extrusion neck ring mold runner is comprised to outlet successively by entrance: entrance (201), shunting section (202), advection section (203), compression section (204), sizing have gas secondary segment (206) to form without gas secondary segment (205), sizing.
In microtubule extrusion neck ring mold (2), spreader (2-6) and plug (2-8) are connected and fixed by screw thread and shunting support (2-7), together constitute the internal face of microtubule contact, wherein the melt entering microtubule extrusion neck ring mold (2) is shunted by spreader (2-6), is beneficial to form hollow plastic tubing; Shunting support (2-7) is on the one hand for supporting spreader (2-6) and being connected plug (2-8), on the other hand for connecting the auxiliary ventilation bolt (2-5) of interior gas, convenient by gas auxiliary for interior gas importing plug (2-8); Compression section (204) for plastic melt being carried out compacting to a certain degree, and produces certain entrance pressure drop, is conducive to the mechanical properties such as the consolidation of the shaping rear goods of raising plastic melt.
The plastic micro Air-Assisted Extrusion of Polymer device proposed in the present invention, comprises a kind of gas and assists microtubule extrusion neck ring mold, and this microtubule extrusion neck ring mold has interior gas accessory system and outer gas accessory system.Wherein, interior gas auxiliary mouth modular system is made up of the auxiliary ventilation bolt (2-5) of interior gas, shunting support (2-7), plug (2-8).Its operation principle is: the auxiliary gas of interior gas is under certain pressure effect, microtubule extrusion neck ring mold (2) is entered by the hollow airway of the auxiliary ventilation bolt (2-5) of interior gas, through the air flue of shunting support (2-7) connector, enter the air flue in the middle of plug (2-8) again, flow out from the air drain of plug (2-8) side again, between melt inwall and plug (2-8) outside wall surface, form internal gas auxiliary layer.
Fig. 3 is the plug side hollow out schematic diagram of interior gas auxiliary microtubule extrusion neck ring mold system.Wherein, Fig. 3 (a) is circular hollow out mode, and Fig. 3 (b) is rectangle hollow out mode.Hollow out line number is greater than 2 row, and upper and lower two adopt position interlace mode hollow out in the ranks, and this position hollow out mode of interlocking can ensure that the gas of the auxiliary layer of interior gas is circumferentially evenly distributed whole.
Outer gas auxiliary mouth modular system is by outer gas auxiliary ventilation bolt (2-15), air inlet mould (2-14), has the auxiliary mouth mould (2-13) of gas to form; The auxiliary air chamber of outer gas by without gas auxiliary mouth mould (2-11), have the auxiliary mouth mould (2-13) of gas and air inlet mould (2-14) to form.There are gas auxiliary mouth mould (2-13) and the gap without 0.1-0.2mm reserved between the auxiliary mouth mould (2-11) of gas, form the auxiliary air inlet gap of outer gas.The auxiliary operation principle of outer gas is: the auxiliary gas of outer gas is under certain pressure effect, enter air inlet mould (2-14) by the hollow airway of outer gas auxiliary ventilation bolt (2-15), have gas auxiliary mouth mould (2-13) and in the air chamber that forms without the auxiliary mouth mould (2-11) of gas, then by without gas auxiliary mouth mould (2-11) and there is air inlet slit flow entrance mould runner between the auxiliary mouth mould (2-13) of gas, between microtubule melt outside wall surface and microtubule extrusion neck ring mold runner inner wall face, extraneous gas auxiliary layer is formed.
Gas accessory system (3) assists total road (301), the auxiliary branch road of interior gas (302) and the auxiliary branch road of outer gas (303) to form by gas, as shown in Figure 4.Wherein, gas assists total road (301) along gas flow direction successively by air compressor machine (301-1), air valve (301-2), rubber tubing (301-3), air accumulator (301-4), Pressure gauge (301-5), pressure-reducing valve (301-6), spinner instrument (301-7), air hose (301-8), gas distributing T-pipe device (301-9), the auxiliary pressure-reducing valve of interior gas (302-1), the auxiliary electromagnetic proportional valve of interior gas (302-2), the auxiliary Pressure gauge of interior gas (302-3), the auxiliary spinner flowmeter of interior gas (302-4) and the auxiliary gas-heating apparatus of interior gas (302-5) and the auxiliary pressure-reducing valve of outer gas (303-1), the auxiliary electromagnetic proportional valve of outer gas (303-2), the auxiliary Pressure gauge of outer gas (303-3), the auxiliary spinner flowmeter of outer gas (303-4) and the auxiliary gas-heating apparatus of outer gas (303-5) are formed.Its operation principle and step are: first, open the draining valve of air accumulator (301-4) bottom, after emptying for the condensate water in air accumulator (301-4), close draining valve again; Open the air valve between air compressor machine (301-1) and air accumulator (301-4), close the pressure-reducing valve (301-6) in air accumulator (301-4) exit simultaneously; Start air compressor machine (301-1), by air compressor machine (301-1), air is compressed, open the air valve (301-2) in air compressor machine (301-1) exit, be delivered to air accumulator (301-4) by rubber tubing (301-3) and store; The pressure-reducing valve (301-6) in air accumulator (301-4) exit can be opened when the Pressure gauge (301-5) in air accumulator (301-4) exit points to 0.6MPa, compressed air exports air valve (301-6) through air accumulator (301-4) and flows out, and arrives gas distributing T-pipe device (301-9) carry out shunting 2 road gas through air hose (301-8); Wherein a road is the auxiliary branch road of interior gas (302), from the wherein branch road of gas distributing T-pipe device (301-9) out after, through the auxiliary pressure-reducing valve of interior gas (302-1), gas flow is controlled by the auxiliary electromagnetic proportional valve of interior gas (302-2), shown pressure and the flow of the gas that this branch road flows through by the auxiliary Pressure gauge of interior gas (302-3) and the auxiliary spinner flowmeter of interior gas (302-4), then enter the auxiliary gas-heating apparatus 302-5 of interior gas and heat; Simultaneously, an other road is the auxiliary branch road of outer gas (303), from the other branch road of gas distributing T-pipe device (301-9) out after, through the auxiliary pressure-reducing valve of outer gas (303-1), gas flow is controlled by the auxiliary electromagnetic proportional valve of outer gas (303-2), shown the flow of the gas that this branch road flows through by the auxiliary spinner flowmeter of the auxiliary Pressure gauge of outer gas (303-3) outer gas (303-4), then enter the auxiliary gas-heating apparatus of outer gas (303-5) and heat; Gas after being heated by the additional thermal of interior gas (302-4) and the additional thermal of outer gas (303-4), enters interior gas auxiliary mouth modular system and the auxiliary mouth modular system of outer gas by interior gas auxiliary ventilation bolt (2-5) and outer gas auxiliary ventilation bolt (2-15) respectively.
For the air-cooled serial air compressor machine of air compressor machine (301-1) optional singe screw, as: the air-cooled serial air compressor machine of 0G06E type singe screw, produced by Shanghai Gairs Machinery Co., Ltd., capacity is 0.8m
3/ min, pressure at expulsion can reach 0.7MPa.Air accumulator is chosen as 1V-3/8 type oxygen storage tank, air accumulator tank 301-4 delivery outlet be furnished with Pressure gauge 301-5, pressure-reducing valve 301-6, spinner instrument 301-7, air accumulator effect for storing pressure-air, and the pressure oscillation of gas can be reduced.
The auxiliary gas-heating apparatus (302-4) of the interior gas of gas accessory system (3) as shown in Figure 5.Gas-heating apparatus (302-4) is wrapped up being formed by copper tube (302-4-1), resistive heater (302-4-2), ceramic short tube (302-4-3), heat-preservation cotton (302-4-4), glass fabric (302-4-5) successively from the inside to the outside.The structure of the gas-heating apparatus (302-4) that the auxiliary gas-heating apparatus (303-4) of the outer gas of gas accessory system (3) is auxiliary with interior gas is completely the same.
As shown in Figure 6, control system (4) mainly comprises melt pressure temperature sensor (4-1), extruder controller (1-6), microtubule extrusion neck ring mold temperature controller (4-2), gas temperature sensor (4-3), gas pressure sensor (4-4), gas temperature controller (4-5), electromagnetic proportional valve (302-2) and (303-2), A/D card (4-6), D/A card (4-7) and computer (4-8) and forms the principle schematic of control system (4).
Melt pressure temperature sensor (4-1) insert microtubule extrusion neck ring mold (2) microtubule extrusion neck ring mold bracket 2-9 and without gas auxiliary mouth mould (2-11) place, as shown in Figure 2.The PT131 melt pressure temperature sensor that melt pressure temperature sensor (4-1) optional Hubei Five Sacred Mountins sensor Co., Ltd produces, pressure range is 0-80MPa, and maximum heatproof can reach 450 °.
Gas temperature sensor (4-3) is thermocouple, is chosen as the WRET-01 type thermocouple sensor that Shanghai Shen Peng electrical instrumentation factory produces.The model that temperature controller is chosen as the production of Jia Ming Instrument Corporation is XMT-101 temperature controller.A/D card and D/A card are multi-channel analog/digital and digital-to-analog data collecting card, wherein, A/D card is chosen as the NIUSB-6002 data collecting card that America NI company produces, and this card is 8 tunnel analog inputs, message transmission rate 50kS/ second, data acquisition resolution ratio 16.D/A card is chosen as the NIUSB-7856R that America NI company produces, and it has 16 digital line inputs and 8 road modulating output, the highest 1MHz independent sample rate, 16 bit resolutions.
The present invention is except the two gas-assisted extrusion devices providing a kind of plastic micro, and also provide a kind of corresponding gas-assisted extrusion method, its forming method concrete steps are as follows:
(1) connect the heating collar of extruder (1) and the power supply of microtubule extrusion neck ring mold heating collar (2-16), each section of extruder barrel (1-3) and microtubule extrusion neck ring mold (2) are heated.
(2) gas accessory system (3) is opened, first air compressor machine (301-1) is opened, then air valve 301-2 is opened, by air compressor machine (301-1) Compressed Gas is pressed in air accumulator (301-4) by air valve (301-2) and rubber hose (301-3) and stores, the force value in air accumulator is shown by the Pressure gauge (301-5) of air accumulator (301-4), arrive after setting value until gas pressure in air accumulator, close air compressor machine (301-1) and air valve (301-2).
(3) when the barrel (1-4) of extruder and the heating temperatures of microtubule extrusion neck ring mold (2) are to design temperature, in connecting, the auxiliary gas-heating apparatus of gas (302-5) and the auxiliary gas-heating apparatus of outer gas (303-5), heated by the copper tube in the auxiliary gas-heating apparatus of the internal gas of resistance wire (302-5) and the auxiliary gas-heating apparatus of outer gas (303-5).
(4) air accumulator air valve (301-6) is opened, the gas flow exported by air accumulator is shown by gas flowmeter (301-7), from air accumulator (301-4) gas out through pressure-reducing valve (301-6), spinner instrument (301-7), the conveying that two-way gas pipeline carries out the auxiliary and auxiliary gas of outer gas of interior gas is split into after air hose (301-8) and gas distributing T-pipe device (301-9), wherein two-way pipeline is all furnished with respective pressure-reducing valve (302-1 and 303-1), the Pressure gauge (302-3 and 303-3) of belt sensor and flowmeter (302-4 and 303-4) are for controlling and show pressure and the flow of each road gas, two-way gas is carried through appendix, enter respective gas-heating apparatus (302-5 and 303-5) to heat, two-way gas after heating enters microtubule extrusion neck ring mold separately respectively by interior gas auxiliary ventilation bolt (2-5) and the auxiliary ventilation bolt (2-15) of outer gas, and in being formed respectively, gas is auxiliary and outer gas is auxiliary.
(5) when extruder (1), after the temperature of microtubule extrusion neck ring mold (2) and gas all reaches predetermined value, plastic raw materials is loaded extruder from extruder hopper (1-2), open the power supply of extruder (1), running extruder screw (1-3), while plastics carry out plasticizing and melting, by extruder screw (1-3) plastic melt to be stirred and rotation is delivered to cross-head, melt is under the driving of extruder screw, the entrance of microtubule extrusion neck ring mold (2) is entered through cross-head (1-5), by the spreader (2-6) in microtubule extrusion neck ring mold, melt is shunted again, melt after shunting is after the flat segments of shunting support (2-7), carry out compression to a certain degree through plug (2-8) compression section again and form certain pressure, the sizing section of the auxiliary mouth mould (2-13) of gas is with after flowing through the sizing section without gas auxiliary mouth mould (2-11) again, due to before not having melt to flow through to have gas auxiliary mouth mould section, by gas accessory system, the gas with certain pressure and temperature is delivered to the sizing section having the auxiliary mouth mould (2-13) of gas, therefore, when melt is by when being provided with gas auxiliary mouth mould section (2-13) without gas auxiliary mouth mould section (2-11), gas and can have the wall of the auxiliary mouth mould (2-13) of gas and plug (2-8) to form gas blanket at melt, the adhesion of such melt and microtubule extrusion neck ring mold and plug wall obtains elimination, melt can be extruded from there being the sizing section of the auxiliary mouth mould (2-13) of gas with piston-shaped form, thus eliminate extrusion swelling, the problem such as melt fracture and torsional deformation.
(6) in extruder (1) running and melt extrusion process, when melt pressure or too high or too low for temperature time, the pressure and temperature of melt is gathered by melt pressure temperature sensor (4-1), gather melt pressure and temperature value by A/D card (4-6) and convert data signal to and send into computer (4-8), again by the pressure and temperature difference of computer 4-8 according to melt, by D/A card (4-7), pressure difference value signal feedback is controlled the rotating speed of extruder (1) screw rod to extruder controller (1-6), thus regulate the flow rate of melt extrusion to regulate the pressure of melt, by D/A card (4-7), temperature difference signal is fed back to microtubule extrusion neck ring mold temperature controller (4-2) simultaneously, control microtubule extrusion neck ring mold heating collar (2-16) by microtubule extrusion neck ring mold temperature controller (4-2) and carry out the control of microtubule extrusion neck ring mold temperature.
(7) in melt extrusion and gas course of conveying, when gas pressure or too high or too low for temperature time, the analog signal of the pressure and temperature of the gas exporting heating is obtained by gas temperature sensor (4-3) and gas pressure sensor (4-4), gathered by A/D card (4-6) again and convert the data signal of corresponding numerical value to, and input to computer (4-8) by data/address bus, computer (4-8) is according to contrasting with the gas pressure preset and temperature value, pressure difference value is fed back to electromagnetic proportional valve (302-2 and 303-2) by A/D card (4-7) and controls the effect that gas flow reaches adjustments of gas pressure, temperature gap is fed back to by A/D card (4-7) effect that gas temperature controller (4-5) the resistance wire power controlled in gas-heating apparatus reaches adjustments of gas heating-up temperature simultaneously.
(8) time within the parameter area that melt flow, pressure, temperature and gas flow, pressure and temperature are all stabilized in setting, the plastic micro gas-assisted extrusion device be made up of extruder (1), microtubule extrusion neck ring mold (2), gas accessory system (3) and control system (4), realizes the extruding smoothly without extrusion swelling, melt fracture and torsional deformation etc. of the plastic micro of certain shape of cross section.
The present invention is not limited to above-mentioned concrete embodiment, and those of ordinary skill in the art is from above-mentioned design, and without performing creative labour, done all conversion, all drop within protection scope of the present invention.
Claims (2)
1. two gas-assisted extrusion devices for plastic micro, is characterized in that: described device is made up of extruder, microtubule extrusion neck ring mold, gas accessory system and control system; Wherein, extruder is singe screw or double screw extruder, is made up of the machine barrel of dynamical system, feed hopper, screw rod, band heating collar, cross-head and extruder controller; Microtubule extrusion neck ring mold, along melt flows direction, by head connecting plate, pressing plate, bolt, handpiece body, interior gas auxiliary ventilation bolt, spreader, shunting support, plug, microtubule extrusion neck ring mold bracket, back-up ring, without gas auxiliary mouth mould, trim ring, has gas auxiliary mouth mould, air inlet mould, the auxiliary ventilation bolt of outer gas, microtubule extrusion neck ring mold heating collar and screw etc. to form; It is outer that microtubule extrusion neck ring mold heating collar is positioned at microtubule extrusion neck ring mold, is wrapped in microtubule extrusion neck ring mold and mouth mould runner, for heating microtubule extrusion neck ring mold; There is in microtubule extrusion neck ring mold a mouthful mould runner, by entrance to outlet comprise successively entrance, shunting section, flat segments, compression section, sizing without gas secondary segment, sizing have gas secondary segment;
Microtubule extrusion neck ring mold and cross-head are formed by connecting by head connecting plate, pressing plate and supporting bolt, the plastic melting physical efficiency that extruder is extruded flows into the porch of microtubule extrusion neck ring mold, then extrudes from the outlet of microtubule extrusion neck ring mold according to microtubule extrusion neck ring mold shape of cross section after microtubule extrusion neck ring mold runner; Microtubule extrusion neck ring mold handpiece body and microtubule extrusion neck ring mold bracket are fixed by back-up ring and screw; Handpiece body is fixed by bolt of ventilating with shunting support; Be fixed by trim ring and screw without the auxiliary mouth mould of gas and microtubule extrusion neck ring mold bracket; Air inlet microtubule extrusion neck ring mold with have the auxiliary mouth mould of gas to be fixed by screw; Outer gas auxiliary ventilation bolt is threaded connection fixing;
In microtubule extrusion neck ring mold, spreader and plug are fixed by screw thread and shunting support, and together constitute the wall of microtubule contact, wherein the melt entering microtubule extrusion neck ring mold is shunted by spreader, is beneficial to form hollow plastic tubing; Shunting support is on the one hand for supporting spreader and being connected plug, on the other hand for connecting the auxiliary ventilation bolt of interior gas, convenient by the hollow airway of gas auxiliary for interior gas importing plug; Compression section is used for the compacting carried out by plastic melt to a certain degree, and produces certain entrance pressure drop, is conducive to the mechanical properties such as the consolidation of the shaping rear goods of raising plastic melt;
Microtubule extrusion neck ring mold has interior gas auxiliary mouth modular system and the auxiliary mouth modular system of outer gas; Wherein, the interior gas auxiliary mouth modular system of microtubule extrusion neck ring mold is made up of the auxiliary ventilation bolt of interior gas, shunting support, spreader and plug; Further, the inside of the auxiliary ventilation bolt of interior gas, shunting support, spreader and plug has hollow airway, for the gas carrying interior gas auxiliary; Its operation principle is: the auxiliary gas of interior gas is under certain pressure effect, microtubule extrusion neck ring mold is entered by interior gas auxiliary ventilation bolt hollow airway, through the hollow airway of shunting stand connection, enter the hollow airway of plug again, flow out from the air drain of plug side again, between melt inwall and mandrel outer wall, form internal gas auxiliary layer; The outer gas auxiliary mouth modular system of microtubule extrusion neck ring mold is by outer gas auxiliary ventilation bolt, air inlet mould, has the auxiliary mouth mould of gas to form; Air inlet mould inwall and have between gas auxiliary mouth mould outer wall and stay certain space, air inlet mould, without gas auxiliary mouth mould with there is gas auxiliary mouth mould to form the auxiliary air chamber of outer gas; There are gas auxiliary mouth mould and the gap without 0.1-0.2mm reserved between the auxiliary mouth mould of gas, form the auxiliary air inlet gap of outer gas; The auxiliary operation principle of outer gas is: the auxiliary gas of outer gas is under certain pressure effect, by the hollow airway of outer gas auxiliary ventilation bolt enter air inlet mould, without gas auxiliary mouth mould and have the auxiliary mouth mould of gas to form air chamber in, then by without gas auxiliary mouth mould and there is the air inlet slit flow between the auxiliary mouth mould of gas to enter the mouth mould runner of microtubule extrusion neck ring mold, between microtubule melt outside wall surface and microtubule extrusion neck ring mold internal face, extraneous gas auxiliary layer is formed;
Gas accessory system assists Zong Lu, the auxiliary branch road of interior gas and the auxiliary branch road of outer gas to form by gas; Wherein, gas assists total curb gas flow direction to be made up of air compressor machine, air valve, rubber tubing, air accumulator, Pressure gauge, air valve, spinner instrument, air hose, gas distributing T-pipe device successively; In interior gas auxiliary route, the auxiliary gas-heating apparatus of the auxiliary pressure-reducing valve of gas, the auxiliary electromagnetic proportional valve of interior gas, the auxiliary Pressure gauge of interior gas, the auxiliary spinner flowmeter of interior gas and interior gas is formed; The auxiliary gas-heating apparatus of the outer auxiliary pressure-reducing valve of gas, the auxiliary electromagnetic proportional valve of outer gas, the auxiliary Pressure gauge of outer gas, the auxiliary spinner flowmeter of outer gas and the outer gas of outer gas auxiliary route is formed; Its operation principle and step are: first, open the draining valve bottom air accumulator, after emptying for the condensate water in air accumulator, close draining valve again; Open the air valve between air compressor machine and air accumulator, close the air valve at reservoir outlet place simultaneously; Start air compressor machine, by air compressor machine, air is compressed, open the air valve in air compressor machine exit, be delivered to air accumulator by rubber tubing and store; Can open the air valve at reservoir outlet place when the Pressure gauge at reservoir outlet place points to 0.6MPa, compressed air flows out through the pressure-reducing valve of reservoir outlet, arrives gas distributing T-pipe device carry out shunting two-way gas through air hose; Wherein a road is the auxiliary branch road of interior gas, from the wherein branch road of gas distributing T-pipe device out after, through the auxiliary pressure-reducing valve of interior gas, gas flow is controlled by the auxiliary electromagnetic proportional valve of interior gas, shown pressure and the flow of the gas that this branch road flows through by the auxiliary pressure sensor of interior gas, Pressure gauge and the auxiliary spinner flowmeter of interior gas, then enter the auxiliary gas-heating apparatus of interior gas and heat; Simultaneously, an other road is the auxiliary branch road of outer gas, from the other branch road of gas distributing T-pipe device out after, through the auxiliary pressure-reducing valve of outer gas, gas flow is controlled by the auxiliary electromagnetic proportional valve of outer gas, shown the flow of the gas that this branch road flows through by the auxiliary pressure sensor of outer gas, the outer auxiliary spinner flowmeter of gas of Pressure gauge, then enter the auxiliary gas-heating apparatus of outer gas and heat; By the gas after the additional thermal of interior gas and the auxiliary heating devices heat of outer gas, enter interior gas auxiliary mouth modular system and the auxiliary mouth modular system of outer gas by interior gas auxiliary ventilation bolt and outer gas auxiliary ventilation bolt respectively;
Control system comprises melt pressure temperature sensor, extruder controller, microtubule extrusion neck ring mold temperature controller, gas temperature sensor, gas pressure sensor, gas temperature controller, electromagnetic proportional valve, A/D card, D/A card and computer; Wherein, melt pressure temperature sensor is connected with microtubule extrusion neck ring mold, for measuring melt pressure in microtubule extrusion neck ring mold runner and temperature; Extruder controller is connected with extruder, for controlling extruder screw rotating speed; Microtubule extrusion neck ring mold temperature controller is connected with microtubule extrusion neck ring mold heating collar, for controlling the temperature of microtubule extrusion neck ring mold heating; Gas temperature sensor is connected with the auxiliary gas-heating apparatus of outer gas with the auxiliary gas-heating apparatus of interior gas, for the temperature after measurement gas heating; Gas pressure sensor is connected with the auxiliary gas-heating apparatus of outer gas with the auxiliary gas-heating apparatus of interior gas, for the pressure after measurement gas heating; Gas temperature controller is connected with the auxiliary gas-heating apparatus of outer gas with the auxiliary gas-heating apparatus of interior gas, for the temperature of adjustments of gas; Electromagnetic proportional valve is connected with the auxiliary branch road of outer gas with the auxiliary branch road of interior gas respectively, for regulating gas flow and the pressure of the auxiliary branch road of tow channel gas.
2. two gas-assisted extrusion methods for plastic micro, is characterized in that:
(1) connect the heating collar of extruder and the power supply of microtubule extrusion neck ring mold heating collar, each section of extruder barrel and microtubule extrusion neck ring mold are heated;
(2) gas accessory system is opened, first air compressor machine is opened, then valve is opened, by air compressor machine Compressed Gas is pressed in air accumulator by air valve and rubber hose and stores, the force value in air accumulator is shown by the Pressure gauge of air accumulator, arrive after setting value until gas pressure in air accumulator, close air compressor machine and air valve;
(3) when the barrel of extruder and the heating temperatures of microtubule extrusion neck ring mold are to design temperature, in connecting, the auxiliary gas-heating apparatus of gas and the auxiliary gas-heating apparatus of outer gas, heated by the copper tube in the auxiliary gas-heating apparatus of the internal gas of resistance wire and the auxiliary gas-heating apparatus of outer gas;
(4) pressure-reducing valve of air accumulator is opened, the gas flow exported by air accumulator is shown by gas flowmeter, be split into through pressure-reducing valve, spinner instrument, air hose and gas distributing T-pipe device the conveying that two-way gas pipeline carries out the auxiliary and auxiliary gas of outer gas of interior gas from air accumulator gas out, wherein two-way pipeline is all furnished with respective pressure-reducing valve, Pressure gauge and flowmeter for controlling and show pressure and the flow of each road gas; Two-way gas is carried through appendix, enters respective gas-heating apparatus and heats, and the two-way gas after heating enters microtubule extrusion neck ring mold separately respectively by interior gas auxiliary ventilation bolt and the auxiliary ventilation bolt of outer gas, and in being formed respectively, gas is auxiliary and outer gas is auxiliary;
(5) when the barrel of extruder, after the temperature of microtubule extrusion neck ring mold and assist gas all reaches predetermined value, plastic raw materials is loaded the barrel of extruder from extruder hopper, open the power supply of extruder, running extruder screw, while plastics carry out plasticizing and melting, by extruder screw plastic melt to be stirred and rotation is delivered to cross-head, melt is under the driving of extruder screw, the entrance of microtubule extrusion neck ring mold is entered through cross-head, by the spreader in microtubule extrusion neck ring mold, melt is shunted again, melt after shunting is after shunting the flat segments of support, carry out compression to a certain degree through plug compression section again and form certain pressure, the sizing section of the auxiliary mouth mould of gas is with after flowing through the sizing section without gas auxiliary mouth mould again, due to before not having melt to flow through to have gas auxiliary mouth mould section, by gas accessory system, the gas with certain pressure and temperature is delivered to the sizing section having the auxiliary mouth mould of gas, therefore, when melt is by when being provided with gas auxiliary mouth mould section without gas auxiliary mouth mould section, gas and can have the wall of the auxiliary mouth mould of gas and plug to form gas blanket at melt, the adhesion of such melt and microtubule extrusion neck ring mold and plug wall obtains elimination, melt can be extruded from there being the sizing section of the auxiliary mouth mould of gas with piston-shaped form, thus eliminate extrusion swelling, melt fracture and torsional deformation,
(6) in extruder running and melt extrusion process, when melt pressure or too high or too low for temperature time, the pressure and temperature of melt in microtubule extrusion neck ring mold is recorded by melt pressure temperature sensor, undertaken gathering pressure and temperature analog signal and the data signal being converted to corresponding amplitude by A/D card, computer is sent into again by data/address bus, computer contrasts according to the pressure and temperature numerical value of the melt obtained in real time and predetermined value, the controller that the difference of pressure feeds back to extruder by D/A card is regulated extruder screw rotating speed, thus regulate melt pressure by the mode controlling melt flow rate, in addition the difference of temperature is fed back to microtubule extrusion neck ring mold temperature controller by D/A card, regulated the temperature of microtubule extrusion neck ring mold heating collar by microtubule extrusion neck ring mold temperature controller,
(7) in melt extrusion and gas course of conveying, when gas pressure or too high or too low for temperature time, the analog signal of the pressure and temperature of the gas exporting heating is obtained by gas pressure and temperature sensor, gathered by A/D card again and convert the data signal of corresponding numerical value to, and input to computer by data/address bus, computer contrasts according to the gas pressure preset and temperature value, pressure difference value is fed back to by A/D card the effect that gas pressure servo valve control gas flow reaches adjustments of gas pressure, temperature gap is fed back to by A/D card the effect that the gas temperature controller resistance wire power controlled in gas-heating apparatus reaches adjustments of gas heating-up temperature simultaneously,
(8) when the flow of the flow of melt, pressure, temperature and gas, pressure and temperature are all stabilized within the parameter area of setting, the plastic micro gas-assisted extrusion device be made up of extruder, microtubule extrusion neck ring mold, gas accessory system and control system, realizes the extruding smoothly without extrusion swelling, melt fracture and torsional deformation of the plastic micro of certain shape of cross section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510394781.1A CN105172093A (en) | 2015-07-08 | 2015-07-08 | Double-gas-assisted extrusion molding device and method for plastic microtubes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510394781.1A CN105172093A (en) | 2015-07-08 | 2015-07-08 | Double-gas-assisted extrusion molding device and method for plastic microtubes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105172093A true CN105172093A (en) | 2015-12-23 |
Family
ID=54894751
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510394781.1A Pending CN105172093A (en) | 2015-07-08 | 2015-07-08 | Double-gas-assisted extrusion molding device and method for plastic microtubes |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105172093A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105799132A (en) * | 2016-03-23 | 2016-07-27 | 江苏景越塑料科技有限公司 | Air floatation forming injection molding preparing method and application of plastic product |
| CN107379574A (en) * | 2017-08-07 | 2017-11-24 | 江西中煜程塑业股份有限公司 | PVC O tubing one step processing devices |
| CN108466418A (en) * | 2018-04-26 | 2018-08-31 | 苟举才 | The hollow extrusion integrated plastic snap-gauge of one kind and its production technology and equipment |
| CN110039742A (en) * | 2019-04-18 | 2019-07-23 | 江西科技师范大学 | A kind of plastic micro double air-assist extrusion gas flow closed-loop control device and methods |
| CN110053231A (en) * | 2019-04-23 | 2019-07-26 | 江西科技师范大学 | A kind of plastic micro air-assist extrusion device and method that gas pressure precision automatically controls |
| CN110154357A (en) * | 2019-05-24 | 2019-08-23 | 南昌大学 | A kind of gas auxiliary thin-walled small bore tube extrusion molding die |
| CN115025708A (en) * | 2022-07-15 | 2022-09-09 | 平泉石尚新材料有限公司 | Color sand spraying granulation device and color sand spraying granulation method |
| CN116423791A (en) * | 2023-06-13 | 2023-07-14 | 南昌大学 | Gas-liquid auxiliary forming device and method for hydrophilic antibacterial medical microtubes |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6155813A (en) * | 1998-03-09 | 2000-12-05 | Lupke; Manfred A. A. | Pipe molding apparatus with air assist of plastic onto cooling plug |
| CN201685428U (en) * | 2010-04-16 | 2010-12-29 | 大连海事大学 | Extrusion molding device for plastic-steel composite pipes |
| CN202592709U (en) * | 2012-06-01 | 2012-12-12 | 广东雄塑科技实业有限公司 | Extrusion device for single-wall corrugated pipe |
| CN102825753A (en) * | 2012-08-16 | 2012-12-19 | 南昌大学 | Gas-assistant extrusion molding method |
| CN203580084U (en) * | 2013-09-21 | 2014-05-07 | 北京化工大学 | Efficient large-sized pipe extrusion molding device |
| CN204820267U (en) * | 2015-07-08 | 2015-12-02 | 南昌大学 | Two gaseous supplementary extrusion moulding device of plastics microtubule |
-
2015
- 2015-07-08 CN CN201510394781.1A patent/CN105172093A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6155813A (en) * | 1998-03-09 | 2000-12-05 | Lupke; Manfred A. A. | Pipe molding apparatus with air assist of plastic onto cooling plug |
| CN201685428U (en) * | 2010-04-16 | 2010-12-29 | 大连海事大学 | Extrusion molding device for plastic-steel composite pipes |
| CN202592709U (en) * | 2012-06-01 | 2012-12-12 | 广东雄塑科技实业有限公司 | Extrusion device for single-wall corrugated pipe |
| CN102825753A (en) * | 2012-08-16 | 2012-12-19 | 南昌大学 | Gas-assistant extrusion molding method |
| CN203580084U (en) * | 2013-09-21 | 2014-05-07 | 北京化工大学 | Efficient large-sized pipe extrusion molding device |
| CN204820267U (en) * | 2015-07-08 | 2015-12-02 | 南昌大学 | Two gaseous supplementary extrusion moulding device of plastics microtubule |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105799132A (en) * | 2016-03-23 | 2016-07-27 | 江苏景越塑料科技有限公司 | Air floatation forming injection molding preparing method and application of plastic product |
| CN107379574A (en) * | 2017-08-07 | 2017-11-24 | 江西中煜程塑业股份有限公司 | PVC O tubing one step processing devices |
| CN108466418A (en) * | 2018-04-26 | 2018-08-31 | 苟举才 | The hollow extrusion integrated plastic snap-gauge of one kind and its production technology and equipment |
| CN110039742A (en) * | 2019-04-18 | 2019-07-23 | 江西科技师范大学 | A kind of plastic micro double air-assist extrusion gas flow closed-loop control device and methods |
| CN110039742B (en) * | 2019-04-18 | 2023-11-03 | 江西科技师范大学 | Gas flow closed-loop control device and method for double-gas-assisted extrusion of plastic microtubes |
| CN110053231A (en) * | 2019-04-23 | 2019-07-26 | 江西科技师范大学 | A kind of plastic micro air-assist extrusion device and method that gas pressure precision automatically controls |
| CN110053231B (en) * | 2019-04-23 | 2023-11-24 | 江西科技师范大学 | Plastic microtube gas-assisted extrusion device and method with precise and automatic control of gas pressure |
| CN110154357A (en) * | 2019-05-24 | 2019-08-23 | 南昌大学 | A kind of gas auxiliary thin-walled small bore tube extrusion molding die |
| CN115025708A (en) * | 2022-07-15 | 2022-09-09 | 平泉石尚新材料有限公司 | Color sand spraying granulation device and color sand spraying granulation method |
| CN115025708B (en) * | 2022-07-15 | 2024-05-14 | 平泉石尚新材料有限公司 | Color sand spraying granulation device and color sand spraying granulation method |
| CN116423791A (en) * | 2023-06-13 | 2023-07-14 | 南昌大学 | Gas-liquid auxiliary forming device and method for hydrophilic antibacterial medical microtubes |
| CN116423791B (en) * | 2023-06-13 | 2023-08-29 | 南昌大学 | Gas-liquid auxiliary forming device and method for hydrophilic antibacterial medical microtubes |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105172093A (en) | Double-gas-assisted extrusion molding device and method for plastic microtubes | |
| CN105437493A (en) | Intelligent single line production system for material plasticizing | |
| CN206066895U (en) | A kind of mobile phone shell processing good plastic extruder of extrusion effect | |
| CN105459379A (en) | Intelligent material plasticization double-line production system | |
| CN105437492A (en) | Intelligent 3D rapid molding/material plasticizing double-line production system | |
| CN204820267U (en) | Two gaseous supplementary extrusion moulding device of plastics microtubule | |
| CN100560335C (en) | A kind of one-step method wood-plastic composite material extrusion equipment of extruding based on single screw rod | |
| CN203994736U (en) | Pvc pipe material modification on-line continuous production line | |
| CN208263384U (en) | A kind of extrusion system | |
| CN102310539A (en) | Extrusion die of plastic pipe production equipment with one runner inlet and eight runner outlets | |
| CN204471849U (en) | A kind of dedicated extruder group for the production of diameter changeable pipe material | |
| CN103624952B (en) | Dual-color plastic hollow sheet production line | |
| CN201538026U (en) | Extruding device for product with odd-shaped cross section | |
| CN204773455U (en) | Fine reinforced composite production system of glass | |
| CN103963264A (en) | Efficient and energy-saving plastic product extrusion molding system | |
| CN204471842U (en) | A kind of constant temperature plastic extruder | |
| CN203957329U (en) | A kind of energy-efficient plastic products extrusion molding system | |
| CN204471848U (en) | Unit is extruded in a kind of automatic control for the production of diameter changeable pipe material | |
| CN203818544U (en) | Die extruding machine | |
| CN204367350U (en) | A kind of steel wire mesh framework composite tube process units | |
| CN205439200U (en) | Environmental protection plastic materials production facility | |
| CN210362387U (en) | Double-screw extruder | |
| CN105252746A (en) | Hollow extruding-blowing forming machine used for producing plastic bottle | |
| CN204869570U (en) | Online biaxial stretching plastic extrusion mould | |
| CN204019968U (en) | For the production of the hollow extrusion blowing formation machine of plastic bottle |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20151223 |
|
| WD01 | Invention patent application deemed withdrawn after publication |