CN103507259B - Efficient large pipe-extrusion forming device - Google Patents

Efficient large pipe-extrusion forming device Download PDF

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Publication number
CN103507259B
CN103507259B CN201310430768.8A CN201310430768A CN103507259B CN 103507259 B CN103507259 B CN 103507259B CN 201310430768 A CN201310430768 A CN 201310430768A CN 103507259 B CN103507259 B CN 103507259B
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pipe
gas
porous
head
embedding pipe
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CN103507259A (en
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杨卫民
杨华光
焦志伟
阎华�
丁玉梅
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Beijing University of Chemical Technology
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Beijing University of Chemical Technology
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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
    • B29C48/14—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the particular extruding conditions, e.g. in a modified atmosphere or by using vibration
    • B29C48/147—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the particular extruding conditions, e.g. in a modified atmosphere or by using vibration after the die nozzle
    • B29C48/1472—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the particular extruding conditions, e.g. in a modified atmosphere or by using vibration after the die nozzle at the die nozzle exit zone
    • 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
    • B29C48/505—Screws
    • B29C48/535—Screws with thread pitch varying along the longitudinal axis
    • 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
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
    • 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
    • B29C48/355—Conveyors for extruded 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
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
    • B29C48/40—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders
    • B29C48/425—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders using three or more screws
    • 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
    • B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
    • B29C48/40—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders
    • B29C48/435—Sub-screws
    • 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
    • B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
    • B29C48/40—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders
    • B29C48/435—Sub-screws
    • B29C48/44—Planetary screws
    • 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
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/22—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of tubes
    • B29C55/26—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of tubes biaxial
    • 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
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/90—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article
    • B29C48/904—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article using dry calibration, i.e. no quenching tank, e.g. with water spray for cooling or lubrication
    • 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
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/911—Cooling
    • B29C48/9115—Cooling of hollow articles
    • B29C48/912—Cooling of hollow articles of tubular films
    • B29C48/913—Cooling of hollow articles of tubular films externally
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2023/00—Tubular articles
    • B29L2023/22—Tubes or pipes, i.e. rigid

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

The invention discloses an efficient large pipe-extrusion forming device. The efficient large pipe-extrusion forming device mainly comprises a planet screw extruder, a gas-assisted extrusion forming machine head and a traction device, wherein the planet screw extruder comprises a temperature control system, a transmission system, a conveying section and a planet section; the planet section comprises a plurality of planet screws and a main screw. The gas-assisted extrusion forming machine head comprises a machine head body, a shunt cone, a shunt cone bracket, an opening die, a core rod, a gas nipple A, a gas nipple B, a porous embedded pipe A, a porous embedded pipe B, a gas chamber outer pipe, a nut, a sealing gasket, a connecting head, an opening die press plate, a gas nipple and a heating ring. The efficient large pipe-extrusion forming device can form a layer of uniform gas film on the inner and outer surfaces of a material through a gas-assisted extrusion technology, reduces the extrusion resistance of the material, solves the problem of low outlet pressure of the planet screw extruder, realizes mass production through the combination of the planet screw extruder and the gas-assisted extrusion forming machine head, and can produce high-strength and high-tenacity PVC-O pipes by performing axial and radial stretching on PVC pipe blanks.

Description

A kind of large pipe extrusion molding apparatus
Technical field
The present invention relates to a kind of large pipe extrusion molding apparatus, it can realize docking of Planetary Screw Extruder and PVC molding port mould, and realizes the PVC-O type tubing of production high strength efficiently, high tenacity, belongs to the extrusion molding equipment field of plastics machinery.
Technical background
PVC is heat sensitive material, and it to the requirement of extruder is: at alap temperature, melt has good Homogeneous phase mixing; Low and enough shearings can be provided to material, and working stability; Often the amount of changing the line of production is high, and the energy extruding per kilogram supplies consumption is low; The dispersiveness of good additive, stabilizing agent and pigment, and mix.At present both at home and abroad production PVC technique be comprise batching, mixing, conical-double-helical rod extruder are extruded, extrusion die, calibration sleeve and spray the operations such as vacuum shaping box, the method is discontinuous and the production cycle is long.And Planetary Screw Extruder plastifies, output is high, meet the target that manufacturing enterprise is pursued, obtain applying more and more widely in PVC processing, but Planetary Screw Extruder exists, and extrusion pressure is low waits deficiency, existing PVC extrusion molding die extrusion resistance is large, easily occurs " sharkskin " and extrudes defects such as breaking, is difficult to realize PVC high speed, high-qualityly extrudes.
Summary of the invention
The object of the invention is for the deficiency existing for prior art, design a kind of compact conformation, efficient and high-quality large pipe extrusion molding apparatus, the advantage that Planetary Screw Extruder plastifies, output is high can not only be played, and can biaxial tension be realized in PVC process, molecularly oriented, make production biaxial tension PVC (PVC-O) tubing become possibility, while improving PVC intensity, improve its toughness.
The technical scheme realizing above-mentioned purpose employing is: a kind of large pipe extrusion molding apparatus, mainly comprise Planetary Screw Extruder, gas-assisted extrusion head and tubing cooling system, draw-gear, Planetary Screw Extruder, gas-assisted extrusion head, tubing cooling system and draw-gear are placed successively, Planetary Screw Extruder and gas-assisted extrusion head link together, Planetary Screw Extruder is by temperature control system, transmission system and transportation section and planet section composition, planet section comprises multiple planetary-screw and driving screw, have a bulb to be threaded connection at the end of driving screw to connect together with driving screw, bulb and spreader seamlessly transit the delay that can not cause material, avoid the degraded of PVC, the rotation direction of bulb screw thread is contrary with the rotation direction of driving screw, bulb so just can be avoided to come off in the process rotated along with driving screw.Gas-assisted extrusion head is made up of handpiece body, spreader, spreader support, mouth mould, plug, valve A, valve B, porous embedding pipe A, the embedding pipe B of porous, air chamber outer tube, nut, seal washer, coupling head, mouth moulded board and heating collar.Spreader, spreader support are connected with handpiece body by screw by mouth moulded board with mouth mould, and valve B is fixed on handpiece body, and handpiece body is provided with temperature element, and heating collar is positioned at outside handpiece body, for by each heat parts of head to setting temperature, air chamber is by valve A, air chamber outer tube, seal washer, nut, the embedding pipe A of porous, the embedding pipe B of porous, coupling head and mouth moulded board are formed, the embedding pipe A of porous is fixed in the stepped hole of air chamber outer tube by matched in clearance (such as H7/f7) requirement, valve A is fixed on air chamber outer tube, one end of the embedding pipe B of porous is connected with coupling head by screw thread, and coupling head is threaded connection on the plug in mouth mould, other one end of porous embedding pipe B connects seal washer and nut, air chamber outer tube and mouth mould are also threaded connection, thread pitch eliminated by pressured tight air chamber sealing circle, handpiece body and mouth moulded board are bolted, valve B passes through handpiece body, spreader support, plug and the embedding pipe B of porous are to air feed in shaping pipe, porous embedding pipe A and porous embedding pipe B is the tubing with multiple hole on tube wall.Compression section is entered through spreader after melting PVC material enters head, material here compresses, when material enters expanding section, extrusion neck ring mold has the trend of radial dilatation, particularly under the booster action of air-flow, circumferentially orientation in the process that PVC melt is shaped at mouth mould, will produce radial stretching.Through draw-gear after PVC is extruded from Air-Assisted Extrusion of Polymer head, the diameter of draw-gear should be slightly less than pipe diameter, under the effect of draw-gear, strand also stretches along lead, cause strand axial tension, thus make the existing axial tension of PVC have radial drawing again, the PVC-O tubing of high strength, high tenacity can be produced.
A kind of large pipe extrusion molding apparatus of the present invention, porous embedding pipe A is the core part of whole head, and this part is the metal powder sintered porous stainless steel metal sleeve of particle diameter 0.5 μm.Gas-assisted extrusion head comprises two air-flows, first air-flow enters air chamber outer tube via valve A and enters middle gas chamber through the embedding pipe A of porous, so just form the uniform air film of one deck at the skin of material, improve the mobility of melt, reduce flow resistance, realize the gas assisted molding of tubing.Another air-flow enters middle gas chamber via the embedding pipe B of valve B, spreader support and porous, pipe inflation is close to the inwall of the embedding pipe A of porous, forms pipe geometry.The air pressure of these two gas circuits should reach dynamic equilibrium, realizes in production mainly through adjustable pressure valve.Will reach suitable temperature through the pre-heat treatment before gas enters head, no person will play cooling effect to melting PVC material, reduces PVC quality.
A kind of large pipe extrusion molding apparatus of the present invention, draw-gear is entered after pvc pipe embryo is extruded from Air-Assisted Extrusion of Polymer head, draw-gear is made up of laterally zygomorphic two conveyer chains, and conveyer chain is arc-shaped, which increase the contact area of conveyer chain and pipe, the diameter that ultimate range between two conveyer chains exports than Air-Assisted Extrusion of Polymer head gas secondary segment is little, like this because grip friction power just can carry out axial stretching to pipe embryo, form axial orientation, improve the intensity of tubing.
The invention has the beneficial effects as follows:
1. use a kind of large pipe extrusion molding apparatus of the present invention, the uniform air film of one deck can be all formed at the surfaces externally and internally of material by Air-Assisted Extrusion of Polymer technology, what reduce material extrudes resistance, solve the problem that Planetary Screw Extruder outlet pressure is low, PVC can be extruded after adding gas-assisted extrusion head of the present invention.
2. use a kind of large pipe extrusion molding apparatus of the present invention, due to Planetary Screw Extruder have self-cleaning, plasticizing efficiency is high, blended effective, the feature such as output is high, specific energy consumption is low, be specially adapted to PVC extrude, Planetary Screw Extruder is used to add the combination of gas-assisted extrusion head, can output be improved, realize large batch of production.
3. use a kind of high-efficiency large tube extrusion forming method of the present invention and device, when material passes through the expanding section of gas-assisted extrusion head, radial stretching can be produced, through draw-gear after PVC is extruded from Air-Assisted Extrusion of Polymer head, the diameter of draw-gear should be slightly less than pipe diameter, the stretching of an axis can be produced like this, thus make the existing axial tension of PVC have radial drawing again, high strength can be produced, the PVC-O material of high tenacity, thus make the existing axial tension of PVC have radial drawing again, high strength can be produced, the PVC-O tubing of high tenacity.
Accompanying drawing explanation
Fig. 1 is a kind of large pipe extrusion molding apparatus of the present invention structural representation.
Fig. 2 is the head expanding section partial enlarged drawing of a kind of large pipe extrusion molding apparatus of the present invention shown in Fig. 1.
In figure, 1-transportation section, 2-planet section, 3-planetary-screw, 4-driving screw, 5-bulb, 6-handpiece body, 7-spreader support, 8-mouth mould, 9-plug, 10-valve A, 11-air chamber outer tube, 12-seal washer, 13-draw-gear, 14-chain link, 15-nut, 16-vacuum sizing device, embedding pipe B, the 19-coupling head of 17-porous embedding pipe A, 18-porous, 20-mouth moulded board, 21-heating collar, 22-valve B, 23-spreader.
Detailed description of the invention
A kind of large pipe extrusion molding apparatus of the present invention, as depicted in figs. 1 and 2, this extrusion molding apparatus comprises Planetary Screw Extruder, gas-assisted extrusion head and draw-gear, described Planetary Screw Extruder is by temperature control system, transmission system and transportation section 1 and planet section 2 form, planet section 2 comprises multiple planetary-screw 3 and driving screw 4, a bulb 5 is had at the end of driving screw 4, bulb 5 is threaded connection and connects together with driving screw 4, bulb 5 and spreader 23 seamlessly transit the delay that can not cause material, avoid the degraded of PVC, the rotation direction of bulb 5 screw thread is contrary with the rotation direction of driving screw, bulb 5 so just can be avoided to come off in the process rotated along with driving screw 4.Gas-assisted extrusion head is made up of handpiece body 6, spreader 23, spreader support 7, mouth mould 8, plug 9, valve A10, valve B22, air chamber outer tube 11, nut 15, seal washer 12, porous embedding pipe A17, the embedding pipe B18 of porous, coupling head 19, mouth moulded board 20 and heating collar 21.Air chamber is made up of valve A10, air chamber outer tube 11, seal washer 12, nut 15, porous embedding pipe A17, the embedding pipe B18 of porous, coupling head 19 and mouth moulded board 20, the embedding pipe A17 of porous is fixed in the stepped hole of air chamber outer tube 11 by matched in clearance (such as H7/f7) requirement, valve A10 is fixed on air chamber outer tube 11, air chamber outer tube 11 and mouth mould 8 are combined as a whole by screw thread by the embedding pipe B18 of nut 15, seal washer 12, porous and coupling head 19, thread pitch eliminated by pressured tight air chamber sealing circle 12, and handpiece body 6 and mouth moulded board 20 are bolted.Compression section is entered through spreader 23 after melting PVC material enters head, material is compression compact here, when material enters expanding section, radial stretching will be produced, through draw-gear after PVC is extruded from Air-Assisted Extrusion of Polymer head, the diameter of draw-gear should be slightly less than pipe diameter, can produce the stretching of an axis like this, thus make the existing axial tension of PVC have radial drawing again, the PVC-O tubing of high strength, high tenacity can be produced.
A kind of large pipe extrusion molding apparatus of the present invention, as shown in Figure 1, the tubing of processing can set up vacuum sizing device 16 or other spray cooling systems between Air-Assisted Extrusion of Polymer head and draw-gear 13, porous embedding pipe A17 is the core part of whole head, and this part is the metal powder sintered porous stainless steel metallic sheath of particle diameter 0.5 μm.Gas-assisted extrusion head comprises two air-flows, first air-flow enters air chamber outer tube 11 via valve A10 and enters middle gas chamber through the embedding pipe A17 of porous, so just form the uniform air film of one deck at the skin of material, improve the mobility of melt, reduce flow resistance, realize the gas assisted molding of tubing.Another air-flow enters middle gas chamber via the embedding pipe B18 of valve 22, spreader support 7 and porous, pipe inflation is close to the inwall of the embedding pipe A17 of porous, forms pipe geometry.The air pressure of these two gas circuits should reach dynamic equilibrium, realizes in production mainly through adjustable pressure valve.Will reach suitable temperature through the pre-heat treatment before gas enters head, no person will play cooling effect to melting PVC material, reduces PVC quality.
A kind of large pipe extrusion molding apparatus of the present invention, as shown in Figure 1, when pvc pipe base enters draw-gear 13 after the expansion of Air-Assisted Extrusion of Polymer head extruded circumferential, draw-gear 13 is made up of laterally zygomorphic two conveyer chains, and chain link 14 one-tenth arc-shaped, which increase the contact area of conveyer chain and pipe embryo, the diameter that ultimate range between two conveyer chains exports than Air-Assisted Extrusion of Polymer head gas secondary segment is little, like this because grip friction power just can carry out axial stretching to pipe embryo, form axial orientation, improve the intensity of tubing.

Claims (4)

1. a large pipe extrusion molding apparatus, it is characterized in that: mainly comprise Planetary Screw Extruder, gas-assisted extrusion head and tubing cooling system, draw-gear, Planetary Screw Extruder, gas-assisted extrusion head, tubing cooling system and draw-gear are placed successively, Planetary Screw Extruder and gas-assisted extrusion head link together, Planetary Screw Extruder is by temperature control system, transmission system and transportation section and planet section composition, planet section comprises multiple planetary-screw and driving screw, have a bulb to be threaded connection at the end of driving screw to connect together with driving screw, bulb and spreader seamlessly transit, the rotation direction of bulb screw thread is contrary with the rotation direction of driving screw, gas-assisted extrusion head is made up of handpiece body, spreader, spreader support, mouth mould, plug, valve A, valve B, porous embedding pipe A, the embedding pipe B of porous, air chamber outer tube, nut, seal washer, coupling head, mouth moulded board and heating collar, spreader, spreader support are connected with handpiece body by screw by mouth moulded board with mouth mould, valve B is fixed on handpiece body, handpiece body is provided with temperature element, heating collar is positioned at outside handpiece body, for by each heat parts of head to setting temperature, air chamber is by valve A, air chamber outer tube, seal washer, nut, the embedding pipe A of porous, the embedding pipe B of porous, coupling head and mouth moulded board are formed, the embedding pipe A of porous is fixed in the stepped hole of air chamber outer tube, valve A is fixed on air chamber outer tube, one end of the embedding pipe B of porous is connected with coupling head by screw thread, and coupling head is threaded connection on the plug in mouth mould, other one end of porous embedding pipe B connects seal washer and nut, air chamber outer tube and mouth mould are also threaded connection, handpiece body and mouth moulded board are bolted, valve B passes through handpiece body, spreader support, plug and the embedding pipe B of porous are to air feed in shaping pipe, porous embedding pipe A and porous embedding pipe B is the tubing with multiple hole on tube wall.
2. a kind of large pipe extrusion molding apparatus according to claim 1, is characterized in that: porous embedding pipe A is by the metal powder sintered porous stainless steel metal sleeve of particle diameter 0.5 μm.
3. a kind of large pipe extrusion molding apparatus according to claim 1, is characterized in that: gas reaches suitable temperature through the pre-heat treatment before entering head.
4. a kind of large pipe extrusion molding apparatus according to claim 1, it is characterized in that: draw-gear is made up of laterally zygomorphic two conveyer chains, the diameter that ultimate range between two conveyer chains exports than Air-Assisted Extrusion of Polymer head gas secondary segment is little, and chain link becomes arc-shaped.
CN201310430768.8A 2013-09-21 2013-09-21 Efficient large pipe-extrusion forming device Active CN103507259B (en)

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CN104002465B (en) * 2014-05-15 2016-06-29 华南理工大学 A kind of swollen-micro formula biaxial stretching pipe continuous shaping method and equipment
CN104816454A (en) * 2015-04-10 2015-08-05 苏州固基电子科技有限公司 Novel tube extruding auxiliary engine
CN104816453A (en) * 2015-04-10 2015-08-05 苏州固基电子科技有限公司 Tube extruding auxiliary engine used for plastic hard tube
CN105172097B (en) * 2015-07-29 2019-05-07 日丰企业集团有限公司 A kind of extrusion molding mould of online biaxial orientation plastics minor caliber pipe
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CN107344414A (en) * 2017-08-03 2017-11-14 安徽蓝通科技股份有限公司 A kind of PVC sizing mill
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CN109333966A (en) * 2018-11-20 2019-02-15 上海公元建材发展有限公司 A kind of production of FRPP reinforcement tubing extrusion molding mould and production method
CN114643686B (en) * 2022-03-23 2023-05-12 大连理工大学 Precise extrusion die with sizing die structure for polyvinylidene fluoride pipe

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