CN110053231A - A kind of plastic micro air-assist extrusion device and method that gas pressure precision automatically controls - Google Patents
A kind of plastic micro air-assist extrusion device and method that gas pressure precision automatically controls Download PDFInfo
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- CN110053231A CN110053231A CN201910329045.6A CN201910329045A CN110053231A CN 110053231 A CN110053231 A CN 110053231A CN 201910329045 A CN201910329045 A CN 201910329045A CN 110053231 A CN110053231 A CN 110053231A
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- 239000004033 plastic Substances 0.000 title claims abstract description 125
- 229920003023 plastic Polymers 0.000 title claims abstract description 125
- 238000001125 extrusion Methods 0.000 title claims abstract description 77
- 238000000034 method Methods 0.000 title claims abstract description 50
- 230000001105 regulatory effect Effects 0.000 claims abstract description 62
- 230000008569 process Effects 0.000 claims abstract description 18
- 238000001816 cooling Methods 0.000 claims description 20
- 238000010438 heat treatment Methods 0.000 claims description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 238000005259 measurement Methods 0.000 claims description 8
- 230000006835 compression Effects 0.000 claims description 7
- 238000007906 compression Methods 0.000 claims description 7
- 238000003825 pressing Methods 0.000 claims description 7
- 238000004441 surface measurement Methods 0.000 claims description 7
- 238000012512 characterization method Methods 0.000 claims description 5
- 230000009471 action Effects 0.000 claims description 4
- 230000008054 signal transmission Effects 0.000 claims description 4
- 238000004513 sizing Methods 0.000 claims description 4
- 230000002146 bilateral effect Effects 0.000 claims description 3
- 239000000498 cooling water Substances 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 3
- 238000007781 pre-processing Methods 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 238000012163 sequencing technique Methods 0.000 claims description 3
- 238000010257 thawing Methods 0.000 claims description 3
- 238000003780 insertion Methods 0.000 claims description 2
- 230000037431 insertion Effects 0.000 claims description 2
- 210000003205 muscle Anatomy 0.000 claims description 2
- 238000003860 storage Methods 0.000 claims description 2
- 230000008961 swelling Effects 0.000 abstract description 4
- 239000007789 gas Substances 0.000 description 222
- 230000000694 effects Effects 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 230000008676 import Effects 0.000 description 3
- 238000007493 shaping process Methods 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 235000013339 cereals Nutrition 0.000 description 2
- 238000003745 diagnosis Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229920002521 macromolecule Polymers 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000002583 angiography Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000008429 bread Nutrition 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000000916 dilatatory effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000003447 ipsilateral effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 238000002559 palpation Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
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- 210000000952 spleen Anatomy 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
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- 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
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
-
- 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
-
- 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
- B29C48/255—Flow control means, e.g. valves
- B29C48/2556—Flow control means, e.g. valves provided in or in the proximity of 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
- B29C48/30—Extrusion nozzles or dies
- B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The present invention is using measuring unit using the electric signal for characterizing diameter and concave-convex surface degree by the plastic micro of extrusion unit and mouth mold unit air-assist extrusion as feedback signal, after amplifying and filter by Signal Pretreatment unit, diameter and concave-convex surface deviation signal are transmitted to PLC precise pressure regulating valve through I/O interface by signal acquisition process unit, for the opening and closing degree of solenoid valve in control PLC precise pressure regulating valve, and then control the auxiliary plastic micro air-assist extrusion automatically controlled with the auxiliary gas pressure of outer gas, final realization gas pressure precision of interior gas in gas auxiliary unit.Compared with conventional plastic micro-pipe squeezes out, the present invention can not only overcome the problems such as extrusion swelling, melt fracture and extrusion deformation, but also the accurate of gas pressure in air-assist extrusion may be implemented and automatically control, so that the plastic micro quality of the stability of air-assist extrusion and extrusion is improved.
Description
Technical field
The present invention relates to technical field of polymer material processing, especially a kind of plastics of gas pressure precision automatic control
Micro-pipe air-assist extrusion device and method.
Background technique
Plastic micro is that a kind of size is small and a kind of higher plastic products of dimension precision requirement, is mainly used at present
Medical diagnosis, optical-fibre communications, in automobile air path/oil circuit and precision instrument and equipment, wherein especially with the application in medical diagnosis
It is prominent, such as: insertion type catheter, comprising: intravascular angiography catheter, sacculus dilating catheter, central venous catheter and various gas
Pipe conduit etc..The all types of plastic micro-pipe of annual China's consumption has more than one hundred million yuans, therefore the production of plastic micro product has
Good market prospects and value.Plastic micro product is after being melted into macromolecule melt under high temperature environment by plastics,
The helical screw agitator of extruder is compressed and is transported down, and extrusion obtains from specific tubing mouth mold, but is squeezed in conventional plastic micro-pipe
During out, since the intrinsic high viscous-elastic behaviour of high molecular material, and melting macromolecule melt produce in mouth mold runner inner wall
Raw shearing and stretching action is easy so that the plastic micro being extruded generates extrusion swelling, melt fracture and extrusion deformation etc.
A series of problems.And by introducing gases into mouth mold, between mouth mold inner wall and plastic micro melt outside wall surface, and
Between the outside wall surface of mouth mold plug and the inner wall of plastic micro melt, it is respectively formed gas blanket, in the auxiliary of two gas blankets
It helps under effect, can greatly reduce the shearing and tensile stress between melt and mouth mold wall surface, so as to overcome plastics micro-
The problems such as extrusion swelling of pipe, melt fracture and extrusion deformation.But whether the plastic micro quality of air-assist extrusion with gas
Can the pressure of gas control appropriate most important in auxiliary extrusion.In other words, the pressure energy of gas is assisted to directly affect gas
The plastic micro quality of auxiliary extrusion, or even directly determine that can plastic micro air-assist extrusion go on smoothly.For gas pressure
Control, the method generallyd use is to manually adjust, but this conventional method can bring some drawbacks, specifically have: production efficiency
Extremely low, control precision do not reach requirement, poor anti jamming capability etc..Therefore, it is necessary to gas in plastic micro air-assist extrusion
Body pressure is realized accurate and is automatically controlled.
Summary of the invention
(1) the technical issues of solving
In order to overcome the shortcoming of above-mentioned plastic micro air-assist extrusion, the invention proposes a kind of gas pressure precisions certainly
The plastic micro air-assist extrusion device and method of dynamic control, apparatus of the present invention are assisted single by extrusion unit, mouth mold unit, gas
Member, measuring unit, Signal Pretreatment unit and signal acquisition process unit are constituted.
(2) technical solution
Technical solution of the present invention: the plastic micro air-assist extrusion device and side that a kind of gas pressure precision automatically controls
Method, including squeeze out unit, mouth mold unit, gas auxiliary unit, measuring unit, Signal Pretreatment unit and signal acquisition process list
Member；Wherein: successively including extruder, cooling trough and dragger before and after the extrusion unit；The mouth mold unit is with molten
Body flow through sequence successively by linkage section, connecting flange, handpiece body, spreader, shunt bracket, plug, pressing ring, without the auxiliary mouth mold of gas
Section, outer gas auxiliary circle cylinder, screw, the auxiliary connector of interior gas and the auxiliary connector of outer gas are constituted, wherein linkage section is inserted into extruder barrel outlet
In, connecting flange is located among linkage section and handpiece body, by connecting flange come fixing port form unit；Handpiece body is mouth mold unit
Outer entirety；Spreader and plug can be fixed on by internal and external threads to be shunted on bracket, is placed into handpiece body, and by interior
The auxiliary connector of gas is fixed with handpiece body；Nesting constitutes annular channel without the auxiliary mouth mold section of gas between the two outside plug；It is auxiliary without gas
Mouth mold section is connected and fixed by pressing ring and screw with handpiece body；Outer gas auxiliary circle cylinder is connect by screw with the auxiliary mouth mold section of no gas solid
It is fixed；The auxiliary connector of outer gas is fixed in the auxiliary mouth mold section outside wall surface of no gas；The gas auxiliary unit according to sequencing successively by
Air compressor machine, air accumulator, pressure reducing valve, triple valve, PLC precise pressure regulating valve one, PLC precise pressure regulating valve two, flowmeter one, flowmeter
Two, gas heater one, gas heater two and binary channels temperature controller are constituted, wherein are led between air compressor machine and air accumulator
Cross high pressure resistant rubber tube connection, pressure reducing valve, triple valve, PLC precise pressure regulating valve one, PLC precise pressure regulating valve two, flowmeter one, stream
Meter two, gas heater one, gas heater two pass sequentially through high-temperature resistant polytetrafluoroethylmelt plastic tube and connect with gas-tpe fitting；
The measuring unit includes calibrating subelement and concave-convex surface measurement two parts of subelement, wherein calibrates subelement by swashing
Laser exciter and photelectric receiver composition, laser-excitation source and photelectric receiver are located at the two sides of plastic micro, and surface is recessed
Convex measurement subelement is made of projection source and light quantity receiver, and projection source and light quantity receiver are located at the same of plastic micro
Side, the Signal Pretreatment unit are successively electrically connected structure by signal amplifier and traffic filter according to signal transmission order
At, the signal acquisition process individual palpation according to signal transmission order by signal picker, signal operation processor and I/O interface according to
Secondary electrical connection is constituted.
A kind of plastic micro air-assist extrusion device and method that gas pressure precision automatically controls, in which: the head
External bread wraps up in heating coil, and the diversion angle value range of the spreader is 30-80 °.
A kind of plastic micro air-assist extrusion device and method that gas pressure precision automatically controls, in which: the shunting
The shunting muscle number of bracket is 3-8 item, and shunts and process an air flue in bracket, with the auxiliary fittings of interior gas.
A kind of plastic micro air-assist extrusion device and method that gas pressure precision automatically controls, in which: the plug
Diameter is determined with the interior diameter of plastic micro product, and plug center also processes an air flue, the compression of plug
Angular region is 30-60 °.
A kind of plastic micro air-assist extrusion device and method that gas pressure precision automatically controls, in which: the outer gas
Auxiliary circle cylinder and handpiece body pass through the fixed composition auxiliary gas chamber of outer gas of screw.
A kind of plastic micro air-assist extrusion device and method that gas pressure precision automatically controls, in which: the PLC essence
Close pressure regulator valve one, PLC precise pressure regulating valve two are electrification magnetic control valve pressure regulator valve.
A kind of plastic micro air-assist extrusion device and method that gas pressure precision automatically controls, in which: the gas
Heater one is successively made of gas heat pump and outer cylinder from the inside to the outside, and gas heater two is successively added by gas from the inside to the outside
Heat pump and outer cylinder are constituted, meanwhile, there are air inlet and air outlet at outer cylinder and outer cylinder both ends respectively.
A kind of plastic micro air-assist extrusion device and method that gas pressure precision automatically controls, in which: the bilateral
Channel temp controller is made of binary channels temperature-controlled cabinet, thermocouple one, thermocouple two, wherein thermocouple one, thermocouple two divide
It is not inserted into outer cylinder and outer circle tube inner chamber, thermocouple one, thermocouple two are connected with channel temperature control cabinet by conducting wire respectively
It connects, is believed the temperature of gas in collected gas heater one, two inner cavity of gas heater by thermocouple one, thermocouple two
Breath is converted to electric signal, then binary channels temperature controller is input to by conducting wire, by the control in binary channels temperature controller
Instrument and relay open the temperature of control gas heating, in addition, the power supply of heat pump and gas heat pump passes through conducting wire and channel
The power switch of temperature-controlled cabinet is connected.
A kind of plastic micro air-assist extrusion device and method that gas pressure precision automatically controls, in which: the signal
Arithmetic processor is electrically connected by I/O interface and PLC precise pressure regulating valve one, PLC precise pressure regulating valve two.
A kind of plastic micro air-assist extrusion device and method that gas pressure precision automatically controls, in which: step 1: will modeling
Expect that particle is packed into extruder barrel from extruder hopper, opens the electricity of extruder and gas heater one, gas heater two
Source sets the temperature of extruder and mouth mold unit, and extruder and mouth mold unit is allowed to be heated until temperature reaches setting temperature
Degree.
Step 2: opening the power supply of air compressor machine in extruder and mouth mold unit heating process, air compressor machine is allowed to generate compression
Air is simultaneously stored into air accumulator, when the compressed air pressure in air accumulator reaches air compressor machine maximum pressure value, air compressor machine
It is automatically stopped, at this moment, the compressed air stored in air accumulator is in case subsequent air-assist extrusion uses.
Step 3: opening the power supply of cooling trough after the temperature of extruder and mouth mold unit reaches predetermined value, pass through pumping
Water in cooling trough lower water is injected into cooling trough by water pump, and forms cooling water circulation, is then turned on dragger,
Set the motor rotation frequency of dragger.
Step 4: opening reservoir outlet valve, then pressure reducing valve is adjusted, the pressure tune for the compressed air that air accumulator is come out
To about 0.3MPa, triple valve is then passed through under the transporting of appendix, gas is divided into two-way by triple valve, it is auxiliary for interior gas all the way
Gas circuit, another way are the auxiliary gas circuit of outer gas, then pass through PLC precise pressure regulating valve one, PLC precise pressure regulating valve two respectively per gas all the way
Automatic precision pressure regulation and the measurement of gas flow are carried out with meter one, flowmeter two, is then added per gas all the way by gas
Hot device one, gas heater two carry out being heated to assigned temperature, finally under the temperature setting control of binary channels temperature controller
It is auxiliary to enter gas by the auxiliary connector of respective interior gas and the auxiliary connector of outer gas respectively for the two-way gas of certain pressure and flow after heating
In extrusion neck ring mold.
Step 5: opening the motor control power supply of extruder, the motor rotation frequency of extruder is set, at this time extruder
Motor drive screw rod, the plastic melt of thawing is stirred, compressed and transported so that molten plastic melt from machine barrel export
It is flowed into mouth mold unit, then melt successively passes through linkage section, shunting section, compression section and the sizing section of mouth mold unit, finally
Reach gas secondary segment, gas is auxiliary under the action of the auxiliary gas blanket of outer gas inside, squeezes out from the outlet of mouth mold unit.
Step 6: by cooling trough, (10, which carry out cooling, determines by the plastic micro of air-assist extrusion under the drive of dragger
Type forms the plastic micro product of certain diameter and wall thickness dimension.
Step 7: by measuring unit calibrate subelement and concave-convex surface measurement subelement respectively to water-cooled shaping after
The overall diameter and concave-convex surface degree of plastic micro carry out On-line sampling system, and by the overall diameter measured and concave-convex surface degree
Corresponding electric signal is converted to, then by signal amplifier and traffic filter respectively to characterization overall diameter and concave-convex surface degree
Electric signal amplify and filter preprocessing, pretreated analog electrical signal is carried out by signal picker again later certain
The acquisition of frequency is simultaneously converted to digital signal, and signal operation processor is then transferred to be analyzed and processed, and makes a reservation for respective
Value compares, and deviation signal is transmitted to PLC precise pressure regulating valve one, PLC precise pressure regulating valve two by I/O interface, finally
The opening and closing degree of electromagnetic valve in PLC precise pressure regulating valve one, PLC precise pressure regulating valve two, realize in gas is auxiliary and the auxiliary gas circuit of outer gas in
The automatic precision of gas pressure controls.
Step 8: the auxiliary gas of interior gas after PLC precise pressure regulating valve one, two automatic precision of PLC precise pressure regulating valve are adjusted
Or the auxiliary gas of outer gas, flow measurement, then the control in binary channels temperature controller are carried out using flowmeter one, flowmeter two
It is lower heated by gas heater one, gas heater two after, entered in mouth mold unit by respective intake interface,
And assisted plastic micro-pipe melt, so that then plastic micro melt repeats the 6th step extremely from the outlet air-assist extrusion of mouth mold unit
8th step, until reaching the deviation model allowed by the deviation of the plastic micro diameter dimension of air-assist extrusion and concave-convex surface degree
It encloses, at this time the pressure through PLC precise pressure regulating valve one, the auxiliary gas of interior gas that PLC precise pressure regulating valve two is adjusted or the auxiliary gas of outer gas
Just reach stable state, to realize the moderately good air-assist extrusion of plastic micro.
(3) beneficial effect
The present invention has the advantages that (1) present invention uses gas-assisted technology, in plastic micro melt and mouth mold unit inner wall
And between plug outside wall surface, it is respectively formed the auxiliary layer of interior gas and the auxiliary layer of outer gas, so that plastic micro melt is squeezed out with piston-shaped, it can
To eliminate the problems such as conventional plastic micro-pipe squeezes out the extrusion swelling generated, melt fracture and extrusion deformation；(2) present invention employs
The auxiliary automatic precision control with the auxiliary gas pressure of outer gas of interior gas in plastic micro air-assist extrusion may be implemented in PLC Closed loop Control
System；(3) present invention measures subelement using subelement and concave-convex surface is calibrated come to plastic micro diameter and concave-convex surface quality
Measure, and combine PLC Closed loop Control, plastic micro air-assist extrusion stability can be made to be improved, gas it is auxiliary squeeze
Plastic micro dimensional accuracy out is higher and surface quality is more preferable.
Other than above-mentioned described objects, features and advantages, there are also other objects, features and advantages by the present invention.Under
Face will be referring to figure, and the present invention is further described.
Detailed description of the invention
Fig. 1 apparatus of the present invention schematic illustration.
Fig. 2 air-assist extrusion die geometry schematic diagram.
Fig. 3 gas heater structural schematic diagram.
Fig. 4 calibrates schematic illustration.
Appended drawing reference: unit 1, extruder 101, cooling trough 102, dragger 103, mouth mold unit 2, linkage section are squeezed out
201, connecting flange 202, handpiece body 203, spreader 204, shunt bracket 205, plug 206, pressing ring 207, without the auxiliary mouth mold section of gas
208, the auxiliary connector 211 of outer gas auxiliary circle cylinder 209, screw 210, interior gas, the auxiliary connector 212 of outer gas, gas auxiliary unit 3, air compressor machine
301, air accumulator 302, pressure reducing valve 303, triple valve 304, PLC precise pressure regulating valve 1, PLC precise pressure regulating valve 2 308, flow
Count one 306, flowmeter 2 309, gas heater 1, body heat pump 307-1, outer cylinder 307-2, gas heater two
310, gas heat pump 310-1, outer cylinder 310-2, binary channels temperature controller 311, binary channels temperature-controlled cabinet 311-1, heat
One 311-2 of galvanic couple, two 311-3 of thermocouple, measuring unit 4, subelement 4-1, laser-excitation source 401, photelectric receiver are calibrated
402, concave-convex surface measurement subelement 4-2, projection source 403, light quantity receiver 404, Signal Pretreatment unit 5, signal amplification
Device 501, traffic filter 502, signal acquisition process unit 6, signal picker 601, signal operation processor 602, I/O interface
603。
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Apparatus of the present invention are by extrusion unit 1, mouth mold unit 2, gas auxiliary unit 3, measuring unit 4, Signal Pretreatment list
Member 5, signal acquisition process unit 6 are constituted, as shown in Figure 1.
1 front and back of extrusion unit successively includes extruder 101, cooling trough 102 and dragger 103, extruder 101
For the raw materials such as plastic grain to be carried out heating and melting into plastic melt, compresses using the helical screw agitator in machine barrel, then will
Molten plastic melt conveying is exported to 101 machine barrel of extruder, then enters plastic micro air-assist extrusion mouth mold unit from machine barrel outlet
2, the plastic products for certain cross sectional shape that cooling trough 102 is used to squeeze out from mouth mold unit 2 carry out water-cooled shaping, dragger
103 for pulling the plastic micro product squeezed out, to obtain continuous continual plastic micro extrusion process.
As shown in Fig. 2, the mouth mold unit 2 flows through sequence successively by linkage section 201, connecting flange 202, machine with melt
Head body 203, spreader 204, shunt bracket 205, plug 206, pressing ring 207, without the auxiliary mouth mold section 208 of gas and outer gas auxiliary circle cylinder 209
It constitutes, wherein linkage section 201 and connecting flange 202 are used to connect 2 import of mouth mold unit and the outlet of 101 machine barrel of extruder
It connects, so that the molten plastic melt in 101 machine barrel of extruder flows down in 2 runner of import form unit in 101 screw drive of extruder.
Handpiece body 203 is entirety outside mouth mold unit 2, is mainly used for integrating all parts in mouth mold unit 2, and handpiece body
Heating coil is wrapped up in 203 outsides, for heating mouth mold unit 2, so that the molten plastic temperature in 2 runner of mouth mold unit obtains
To holding.Spreader 204 is for shunting plastic melt, to form hollow plastic products structure, spreader 204
The usual value range of diversion angle is 30-80 °.Bracket 205 is shunted for spreader 204 and plug 206 to be fixed, and point
An air flue is processed in stream bracket 205 for importing the auxiliary gas of interior gas.Plug 206 be used for so that molten plastic micro-pipe it is interior
Chamber carries out shaping processing, and 206 diameter of plug can be determined according to the interior diameter of plastic micro product, in plug 206
The heart also processes an air flue, is used to import the auxiliary gas of gas in plastic micro together with bracket 205 is shunted, and the pressure of plug
Contracting angle value range is 30-60 °.The no auxiliary mouth mold section 208 of gas is used to determine the outside wall surface of molten plastic micro-pipe, and plug 206
Diameter and without the auxiliary mouth mold section 208 of gas interior diameter interaction, thus it is possible to vary interior diameter, overall diameter and the wall thickness of plastic micro
Size.Outer gas auxiliary circle cylinder 209 is used to the auxiliary gas of outer gas being introduced into 2 runner inner wall face of mouth mold unit, so that molten plastic
Auxiliary gas blanket is formed between the 2 runner inner wall face of outside wall surface and mouth mold unit of micro-pipe, to realize the external gas of plastic micro
Auxiliary extrusion.Outer gas auxiliary circle cylinder 209 and handpiece body 203 constitute the auxiliary gas chamber of outer gas by the way that screw 210 is fixed, effect mainly so that
The auxiliary air inlet of outer gas entered from the auxiliary connector 212 of outer gas is steady.The no auxiliary mouth mold section 208 of gas passes through pressing ring 207 and screw 210 and head
Body 203 is connected and fixed.Outer gas auxiliary circle cylinder 209 is connected and fixed by screw 210 with the auxiliary mouth mold section 208 of no gas.
Further, in the mouth mold unit 2, the auxiliary specific implementation method of the auxiliary and internal gas of external gas is formed such as
Under: for auxiliary for external gas, from all the way gas of the gas auxiliary unit 3 after the heating of heater 2 310, from mouth mold unit
The auxiliary connector 212 of outer gas in 2 enters, the gas that then gas successively passes through outer gas auxiliary circle cylinder 209 and constitutes without the auxiliary mouth mold section 208 of gas
Then room enters in 2 runner of mouth mold unit from outer gas auxiliary circle cylinder 209 and without the annular gap between the auxiliary mouth mold section 208 of gas,
Extraneous gas auxiliary layer is formed between plastic micro melt outside wall surface and mouth mold runner inner wall face.And it is auxiliary for internal gas for,
From other all the way gas of the gas auxiliary unit 3 after the heating of heater 1, connect by the way that the interior gas on handpiece body 203 is auxiliary
First 211 enter, and then pass sequentially through the air flue shunted in bracket 205 and plug 206, finally flow out from 206 middle section of plug,
The auxiliary gas blanket of gas in being formed between 206 outside wall surface of plug and the inner wall of molten plastic micro-pipe melt.
The gas auxiliary unit 3 is according to sequencing successively by air compressor machine 301, air accumulator 302, pressure reducing valve 303, three
Port valve 304, PLC precise pressure regulating valve 1, PLC precise pressure regulating valve 2 308, flowmeter 1, flowmeter 2 309, gas add
Hot device 1, gas heater 2 310 and binary channels temperature controller 311 are constituted, wherein air compressor machine 301 is used as gas source, uses
In the gas for generating certain pressure.Air accumulator 302 is for storing the gas that air compressor machine 301 generates, air compressor machine 301 and storage
It is connected between gas tank 302 by high pressure resistant rubber tube.The gas come out from air accumulator 302 carries out decompression tune by pressure reducing valve 303
Section, to obtain the gas of modest pressure range.Triple valve 304 is used to for the gas come out in air accumulator 302 being split into
Two-way gas is all the way the auxiliary gas circuit of outer gas, and in addition one is the auxiliary gas circuit of interior gas.PLC precise pressure regulating valve 1 and PLC precision tune
Pressure valve 2 308 for adjusting the gas pressure of two auxiliary air passages again, to be suitble to plastic micro air-assist extrusion to press
Power needs.PLC precise pressure regulating valve 1 and PLC precise pressure regulating valve 2 308 are electrification magnetic control valve pressure regulator valve, pass through data
I/O interface 603 is in the control instruction for receiving signal operation processor 602 and sending, to PLC precise pressure regulating valve 1 and PLC essence
The opening degree of the electric magnetic control valve of close pressure regulator valve 2 308 automatically adjusts, and is finally reached the effect of regulating gas pressure.Flow
Count 1 and flowmeter 2 309 be respectively used to measurement by PLC precise pressure regulating valve 1 and 2 308 pairs of PLC precise pressure regulating valve
Gas flow size after gas pressure adjusting.Gas heater 1 and gas heater 2 310 from the inside to the outside successively by
Gas heat pump 307-1 and 310-1 and outer cylinder 307-2 and 310-2 are constituted, as shown in Figure 3.Gas heat pump 307-1 and
The gas that 310-1 is used to will go into gas heater 1 is quickly heated, and outer cylinder 307-1 and 310-2 are mainly used
In constituting a gas heating chamber, heated convenient for the gas of input.Meanwhile the both ends point on outer cylinder 307-1 and 310-2
There are not air inlet and air outlet, is respectively used to inject a gas into two heaters and carries out heating and carry out the gas after heating defeated
Out.Temperature controller 311 is made of one 311-2 of binary channels temperature-controlled cabinet 311-1 and thermocouple, two 311-3 of thermocouple,
In, one 311-2 of thermocouple, two 311-3 of thermocouple are inserted into the inner cavity of outer cylinder 307-1 and 310-2 of temperature heater, heat
One 311-2 of galvanic couple, two 311-3 of thermocouple are connect with binary channels temperature-controlled cabinet 311-1 by conducting wire, and one 311- of thermocouple is passed through
2, two 311-3 of thermocouple is by the temperature information of gas in collected gas heater 1,2 310 inner cavity of gas heater
Electric signal is converted to, binary channels temperature controller 311-1 is then input to by conducting wire, by binary channels temperature-controlled cabinet 311-1
In control instrument and relay open control gas heating temperature.In addition, gas heater 1, gas heater 2 310
The power supply of middle gas heat pump 307-1 and 310-1 are connected by conducting wire with the power switch of binary channels temperature-controlled cabinet 311-1
It connects, is synchronized by the power switch of binary channels temperature-controlled cabinet 311-1 and open gas heater 1, gas heater 2 310
Heating work.Pressure reducing valve 303, triple valve 304, PLC precise pressure regulating valve 1, PLC precise pressure regulating valve 2 308, flowmeter one
306, flowmeter 2 309, gas heater 1 and gas heater 2 310 pass sequentially through high-temperature resistant polytetrafluoroethylmelt plastics
Pipe is connected with gas-tpe fitting.
The measuring unit 4 includes calibrating subelement 4-1 and concave-convex surface measurement two parts subelement 4-2.Wherein,
It calibrates subelement 4-1 to be made of laser-excitation source 401 and photelectric receiver 402, laser-excitation source 401 and photelectric receiver 402
It is located at the two sides of plastic micro.It calibrates shown in 401 schematic illustration of subelement such as Fig. 4 (a), by the light source of laser-excitation source
401-1 issues light, successively expands by beam expanding lens 401-2 with after collimating mirror 401-3 collimation, laser light curtain is formed, by laser light
Curtain is vertically projected in plastic micro, since plastic micro blocks intermediate light curtain, can measure on photelectric receiver 402
The outer diameter of the plastic micro of intermediate sheltering part, and obtain the electric signal of characterization plastic micro outer diameter size, such as Fig. 4
(b) shown in.Figure (1) is the electric signal figure of the plastic micro outer diameter dimension of standard in Fig. 4 (b), and zero-signal width H0 can in figure
To be characterized as the plastic micro outer diameter dimension size of standard.If zero in the electric signal obtained by photelectric receiver 402
Signal width H1 is greater than H0, then shows that the overall diameter of certain section of plastic micro measured is greater than the plastic micro overall diameter of standard；
, whereas if the zero-signal width H2 in the electric signal obtained by photelectric receiver 402 is less than H0, then show certain section measured
The overall diameter of plastic micro is less than the plastic micro overall diameter of standard.Concave-convex surface measures subelement 4-2 by projection source 403
It is constituted with light quantity receiver 404, projection source 403 and light quantity receiver 404 are located at the ipsilateral of plastic micro, and it acts as be used for
Plastic micro concave-convex surface situation is measured, and characterization plastic micro concave-convex surface degree is obtained by light quantity detector
Electric signal.
The Signal Pretreatment unit 5 includes 502 two parts of signal amplifier 501 and traffic filter.Its main function
It can be that photelectric receiver 402 and light quantity receiver 404 are detected into obtained analog electrical signal, carry out signal amplification and signal respectively
Filtering processing.
The signal acquisition process unit 6 is by signal picker 601, signal operation processor 602 and I/O interface 603
Successively electrical connection is constituted.Its effect is: signal picker 601 under certain frequency, to it is pretreated calibrate electric signal and
Light quantity electric signal is acquired, and is then converted into digital signal.Then, the number converted by 602 Duis of signal operation processor is believed
It number is analyzed and processed, and digital signal will be calibrated and light quantity digital signal is compared with respective setting value respectively, point
It does not obtain calibrating error amount and light quantity error amount.Then, error amount is transferred to PLC precise pressure regulating valve one by I/O interface 603
305 and PLC precise pressure regulating valve 2 308 comes in automatically control PLC precise pressure regulating valve 1 and PLC precise pressure regulating valve 2 308
The opening and closing degree of electromagnetic valve, to realize the automatic precision control of gas pressure in air-assist extrusion system.
The present invention also provides a kind of realization plastic micro air-assist extrusion gas pressure essence other than providing above-mentioned apparatus
Close control method, specific as follows:
Step 1: plastic grain is packed into extruder barrel from 101 hopper of extruder, opens extruder 101 and gas adds
Hot device 1,2 310 power supply of gas heater, set the temperature of extruder 101 and mouth mold unit 2, allow 101 He of extruder
Mouth mold 2 is heated until temperature reaches set temperature, such as: 220 DEG C.
Step 2: in 2 heating process of extruder 101 and mouth mold unit, the power supply of air compressor machine 301 is opened, allows air compressor machine
301 generate compressed air and store into air accumulator 302, until the compressed air pressure in air accumulator 302 reaches air compressor machine most
When big pressure value, air compressor machine 301 is automatically stopped, and the compressed air at this moment stored in air accumulator 302 is in case subsequent air-assist extrusion makes
With.
Step 3: opening the electricity of cooling trough 102 after the temperature of extruder 101 and mouth mold unit 2 reaches predetermined value
Water in 102 lower water of cooling trough is injected in screw clamp by suction pump, and forms cooling water circulation by source.Then, it opens
Dragger 103 is opened, the motor rotation frequency of dragger 103 is set.
Step 4: opening 302 outlet valve of air accumulator, then pressure reducing valve 303 is adjusted, the compression that air accumulator 302 is come out is empty
The pressure of gas is adjusted to about 0.3MPa.Then, triple valve 304 is passed through under the transporting of appendix, is divided into gas by triple valve 304
Two-way is all the way the auxiliary gas circuit of interior gas, and another way is the auxiliary gas circuit of outer gas.Then pass through PLC precise pressure regulating valve respectively per gas all the way
One 305, PLC precise pressure regulating valve 2 308, flowmeter 1, flowmeter 2 309 carry out automatic precision pressure regulation and gas flow
Measurement.Then, pass through gas heater 1, gas heater 2 310 per gas all the way, in binary channels temperature controller
It carries out being heated to assigned temperature under 311 temperature setting control.Finally, the two-way gas of certain pressure and flow after heating,
It is entered in air-assist extrusion mouth mold unit 2 by the auxiliary connector 211 of respective interior gas and the auxiliary connector 212 of outer gas respectively.
Step 5: opening the motor control power supply of extruder 101, the motor rotation frequency of extruder 101 is set, at this time
The motor of extruder 101 drives screw rod, and the plastic melt of thawing is stirred, compresses and is transported, so that molten plastic melt
Enter from machine barrel outlet stream into mouth mold unit 2.Then, melt successively passes through the linkage section, shunting section, compression section of mouth mold unit 2
With sizing section, gas secondary segment is finally reached, gas is auxiliary under the action of the auxiliary gas blanket of outer gas inside, squeezes out from mouth mold outlet.
Step 6: it is cooling fixed to carry out by cooling trough 102 by the plastic micro of air-assist extrusion under the drive of dragger
Type forms the plastic micro product of certain diameter and wall thickness dimension.
Step 7: by calibrating subelement 4-1 and concave-convex surface measurement subelement 4-2 respectively to water cooling in measuring unit 4
The overall diameter and concave-convex surface degree of plastic micro after sizing carry out On-line sampling system, and by the overall diameter measured and surface
Concave-convex degree is converted to corresponding electric signal, then by signal amplifier 501 and traffic filter 502 respectively to characterization overall diameter
It is amplified with the electric signal of concave-convex surface degree and filter preprocessing, later again by signal picker 601 to pretreated
Analog electrical signal carries out the acquisition of certain frequency and is converted to digital signal, and signal operation processor 602 is then transferred to be divided
Analysis processing, and compared with respective predetermined value, and deviation signal is transmitted to PLC precise pressure regulating valve by I/O interface 603
One 305, PLC precise pressure regulating valve 2 308, electromagnetic valve in last PLC precise pressure regulating valve 1, PLC precise pressure regulating valve 2 308
Opening and closing degree, realize in gas is auxiliary and the auxiliary gas circuit of outer gas in gas pressure automatic precision control.
Step 8: the interior gas after PLC precise pressure regulating valve 1,2 308 automatic precision of PLC precise pressure regulating valve are adjusted
Auxiliary gas or the auxiliary gas of outer gas carry out flow measurement using flowmeter 1, flowmeter 2 309, then in bilateral channel temp
After being heated under the control of controller 311 by gas heater 1, gas heater 2 310, pass through respective air inlet connecting
Mouth enters in mouth mold unit 2, and assisted plastic micro-pipe melt, so that plastic micro melt working off one's feeling vent one's spleen from mouth mold unit 2
Then auxiliary extrusion repeats the 6th step to the 8th step, until by the plastic micro diameter dimension and concave-convex surface degree of air-assist extrusion
Deviation reach the deviation range allowed, at this time through PLC precise pressure regulating valve 1, PLC precise pressure regulating valve 2 308 adjust in
The pressure of the auxiliary gas of gas or the auxiliary gas of outer gas just reaches stable state, squeezes to realize that the moderately good gas of plastic micro is auxiliary
Out.
It should be noted that the terms "include", "comprise" or its any other variant are intended to the packet of nonexcludability
Contain, so that the process, method, article or equipment for including a series of elements not only includes those elements, but also including
Other elements that are not explicitly listed, or further include for elements inherent to such a process, method, article, or device.
In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that including the element
Process, method, article or equipment in there is also other identical elements.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (10)
1. the plastic micro air-assist extrusion device and method that a kind of gas pressure precision automatically controls, including squeeze out unit (1), mouth
Form unit (2), gas auxiliary unit (3), measuring unit (4), Signal Pretreatment unit (5) and signal acquisition process unit (6)；
It is characterized by: successively including extruder (101), cooling trough (102) and dragger before and after the extrusion unit (1)
(103)；The mouth mold unit (2) flows through sequence successively by linkage section (201), connecting flange (202), handpiece body with melt
(203), spreader (204), shunt bracket (205), be plug (206), pressing ring (207), auxiliary without the auxiliary mouth mold section (208) of gas, outer gas
Cylinder (209), screw (210), the auxiliary connector of interior gas (211) and the auxiliary connector of outer gas (212) are constituted, wherein linkage section (201) insertion
In the outlet of extruder (101) machine barrel, connecting flange (202) is located at linkage section (201) and handpiece body (203) is intermediate, passes through connection
Flange (202) comes fixing port form unit (2), and handpiece body (203) is that mouth mold unit (2) are whole outside；Spreader (204) and plug
(206) it can be fixed on and be shunted on bracket (205) by internal and external threads, placed into handpiece body (203), and is auxiliary by interior gas
Connector (211) is fixed with handpiece body (203), nested without the auxiliary mouth mold section (208) of gas outside plug (206), between the two structure
Runner is circularized, the no auxiliary mouth mold section (208) of gas is connected and fixed by pressing ring (207) and screw (210) with handpiece body (203), outside
Gas auxiliary circle cylinder (209) is connected and fixed by screw (210) with the auxiliary mouth mold section (208) of no gas, and the auxiliary connector of outer gas (212) is fixed on nothing
In auxiliary mouth mold section (208) outside wall surface of gas；The gas auxiliary unit (3) is according to sequencing successively by air compressor machine (301), storage
Gas tank (302), pressure reducing valve (303), triple valve (304), PLC precise pressure regulating valve one (305), PLC precise pressure regulating valve two (308),
Flowmeter one (306), flowmeter two (309), gas heater one (307), gas heater two (310) and bilateral channel temp control
Device (311) processed is constituted, wherein is connect between air compressor machine (301) and air accumulator (302) by high pressure resistant rubber tube, pressure reducing valve
(303), triple valve (304), PLC precise pressure regulating valve one (305), PLC precise pressure regulating valve two (308), flowmeter one (306), stream
Meter two (309), gas heater one (307), gas heater two (310) pass sequentially through high-temperature resistant polytetrafluoroethylmelt plastic tube
It is connected with gas-tpe fitting；The measuring unit (4) includes calibrating subelement (4-1) and concave-convex surface measurement subelement (4-2)
Two parts are calibrated subelement (4-1) and are made of laser-excitation source (401) and photelectric receiver (402), laser-excitation source
(401) and photelectric receiver (402) is located at the two sides of plastic micro, and concave-convex surface measures subelement (4-2) by projection light
Source (403) and light quantity receiver (404) are constituted, and projection source (403) and light quantity receiver (404) are located at the same of plastic micro
Side；The Signal Pretreatment unit (5) is according to signal transmission order successively by signal amplifier (501) and traffic filter
(502) electrical connection is constituted；The signal acquisition process list (6) is according to signal transmission order by signal picker (601), letter
Number arithmetic processor (602) and I/O interface (603) are successively electrically connected composition.
2. plastic micro air-assist extrusion device and side that a kind of gas pressure precision according to claim 1 automatically controls
Method, it is characterised in that: heating coil, the diversion angle value range of the spreader (204) are wrapped up outside the handpiece body (203)
It is 30-80 °.
3. plastic micro air-assist extrusion device and side that a kind of gas pressure precision according to claim 1 automatically controls
Method, it is characterised in that: the shunting muscle number of the shunting bracket (205) is 3-8 item, and shunts and process in bracket (205)
One air flue is connected to the auxiliary connector of interior gas (211).
4. plastic micro air-assist extrusion device and side that a kind of gas pressure precision according to claim 1 automatically controls
Method, it is characterised in that: plug (206) diameter is determined with the interior diameter of plastic micro product, and plug
(206) center also processes an air flue, and the compression angular region of plug (206) is 30-60 °.
5. plastic micro air-assist extrusion device and side that a kind of gas pressure precision according to claim 1 automatically controls
Method, it is characterised in that: the outer gas auxiliary circle cylinder (209) and handpiece body (203) constitutes the auxiliary gas of outer gas by the way that screw (210) are fixed
Room.
6. plastic micro air-assist extrusion device and side that a kind of gas pressure precision according to claim 1 automatically controls
Method, it is characterised in that: the PLC precise pressure regulating valve one (305), PLC precise pressure regulating valve two (308) are electrification magnetic control valve
Pressure regulator valve.
7. plastic micro air-assist extrusion device and side that a kind of gas pressure precision according to claim 1 automatically controls
Method, it is characterised in that: the gas heater one (307) is from the inside to the outside successively by gas heat pump (307-1) and outer cylinder
(307-2) is constituted, and gas heater two (310) is from the inside to the outside successively by gas heat pump (310-1) and outer cylinder (310-2) structure
At, meanwhile, there are air inlet and air outlet at outer cylinder (307-2) and the both ends outer cylinder (310-2) respectively.
8. plastic micro air-assist extrusion device and side that a kind of gas pressure precision according to claim 1 automatically controls
Method, it is characterised in that: the binary channels temperature controller (311) is by binary channels temperature-controlled cabinet (311-1), thermocouple one
(311-2), thermocouple two (311-3) are constituted, wherein thermocouple one (311-2), thermocouple two (311-3) are inserted respectively into outer
In cylinder (307-2) and the inner cavity outer cylinder (310-2), thermocouple one (311-2), thermocouple two (311-3) respectively with channel temperature
Control cabinet (311-1) is spent by conducting wire connection, by thermocouple one (311-2), thermocouple two (311-3) by collected gas
The temperature information of gas is converted to electric signal in heater one (307), gas heater two (310) inner cavity, then passes through conducting wire
Be input to binary channels temperature controller (311), by binary channels temperature controller (311) control instrument and relay open control
The temperature of gas heating, in addition, the power supply of heat pump (307-1) and gas heat pump (310-1) passes through conducting wire and channel temperature
The power switch of control cabinet (311-1) is connected.
9. plastic micro air-assist extrusion device and side that a kind of gas pressure precision according to claim 1 automatically controls
Method, it is characterised in that: the signal operation processor (602) passes through I/O interface (603) and PLC precise pressure regulating valve one
(305), PLC precise pressure regulating valve two (308) is electrically connected.
10. the plastic micro air-assist extrusion device automatically controlled using a kind of gas pressure precision described in claim 1 and side
Method, it is characterised in that specific implementation method is as follows:
Step 1: by plastic grain from extruder (101) hopper be packed into extruder (101) machine barrel in, open extruder (101) and
The power supply of gas heater one (307), gas heater two (310) sets the temperature of extruder (101) and mouth mold unit (2)
Degree, allows extruder (101) and mouth mold unit (2) to be heated until temperature reaches set temperature.
Step 2: in extruder (101) and mouth mold unit (2) heating process, the power supply of air compressor machine (301) is opened, allows pneumatics
Machine (301) generates compressed air and stores in air accumulator (302), until the compressed air pressure in air accumulator (302) reaches
When air compressor machine (301) maximum pressure value, air compressor machine (301) is automatically stopped, at this moment, the compressed air stored in air accumulator (302)
In case subsequent air-assist extrusion uses.
Step 3: opening the electricity of cooling trough (102) after the temperature of extruder (101) and mouth mold unit (2) reaches predetermined value
Water in cooling trough (102) lower water is injected into cooling trough (102) by suction pump, and forms cooling water by source
Circulation, is then turned on dragger (103), sets the motor rotation frequency of dragger (103).
Step 4: opening air accumulator (302) outlet valve, then pressure reducing valve (303) are adjusted, the compression that air accumulator (302) are come out
The pressure of air is adjusted to about 0.3MPa, then passes through triple valve (304) under the transporting of appendix, by triple valve (304) by gas
Body is divided into two-way, is all the way the auxiliary gas circuit of interior gas, and another way is the auxiliary gas circuit of outer gas, then passes through PLC precision respectively per gas all the way
Pressure regulator valve one (305), PLC precise pressure regulating valve two (308) and meter one (306), flowmeter two (309) carry out automatic precision pressure regulation
And the measurement of gas flow, then pass through gas heater one (307), gas heater two (310) per gas all the way, double
Be heated to assigned temperature under the temperature setting control of channel temperature controller (311), it is finally heated after certain pressure and
The two-way gas of flow enters air-assist extrusion mouth mold by the respective interior auxiliary connector of gas (211) and the auxiliary connector of outer gas (212) respectively
In.
Step 5: opening the motor control power supply of extruder (101), the motor rotation frequency of extruder (101) is set, at this time
The motor of extruder (101) drives screw rod, and the plastic melt of thawing is stirred, compresses and is transported, so that molten plastic is molten
Body enters from machine barrel outlet stream in mouth mold unit (2), and then melt successively passes through the linkage section, shunting section, pressure of mouth mold unit (2)
Contracting section and sizing section, finally reach gas secondary segment, and gas is auxiliary under the action of the auxiliary gas blanket of outer gas inside, export from mouth mold unit (2)
Middle extrusion.
Step 6: it is cooling fixed to carry out by cooling trough (102) by the plastic micro of air-assist extrusion under the drive of dragger
Type forms the plastic micro product of certain diameter and wall thickness dimension.
Step 7: by calibrating subelement (4-1) and concave-convex surface measurement subelement (4-2) respectively to water in measuring unit (4)
The overall diameter and concave-convex surface degree of plastic micro after cold formed carry out On-line sampling system, and by the overall diameter measured and table
Face bumps degree is converted to corresponding electric signal, then by signal amplifier (501) and traffic filter (502) respectively to characterization
The overall diameter and electric signal of concave-convex surface degree amplifies and filter preprocessing, later again by signal picker (601) to pre-
Treated, and analog electrical signal carries out the acquisition of certain frequency and is converted to digital signal, then transfers to signal operation processor
(602) it is analyzed and processed, and is compared with respective predetermined value, and deviation signal is transmitted to by I/O interface (603)
PLC precise pressure regulating valve one (305), PLC precise pressure regulating valve two (308), last PLC precise pressure regulating valve one (305), PLC precision tune
The opening and closing degree of electromagnetic valve in pressure valve two (308) realizes the auxiliary automatic precision control with gas pressure in the auxiliary gas circuit of outer gas of interior gas
System.
Step 8: the interior gas after PLC precise pressure regulating valve one (305), PLC precise pressure regulating valve two (308) automatic precision are adjusted
Auxiliary gas or the auxiliary gas of outer gas carry out flow measurement using flowmeter one (306), flowmeter two (309), then in binary channels
After being heated under the control of temperature controller (311) by gas heater one (307), gas heater two (310), by each
From intake interface enter in mouth mold unit (2), and assisted plastic micro-pipe melt, so that plastic micro melt is from mouth mold list
The outlet air-assist extrusion of first (2), then repeats the 6th step to the 8th step, until by the plastic micro diameter dimension of air-assist extrusion and
The deviation of concave-convex surface degree reaches the deviation range allowed, at this time through PLC precise pressure regulating valve one (305), PLC precise pressure regulating valve
The pressure of the auxiliary gas of interior gas or the auxiliary gas of outer gas that two (308) are adjusted just reaches stable state, to realize that plastic micro is steady
Fixed good air-assist extrusion.
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Cited By (1)
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| CN115219100A (en) * | 2022-09-21 | 2022-10-21 | 中国空气动力研究与发展中心空天技术研究所 | Total pressure measuring structure of combustion heater |
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| CN1075908A (en) * | 1992-02-27 | 1993-09-08 | 清华大学 | A kind of pipe, wire rod pressed production line |
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