CN110239049B - Four-layer three-machine-head plastic extruder - Google Patents

Four-layer three-machine-head plastic extruder Download PDF

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Publication number
CN110239049B
CN110239049B CN201910510894.1A CN201910510894A CN110239049B CN 110239049 B CN110239049 B CN 110239049B CN 201910510894 A CN201910510894 A CN 201910510894A CN 110239049 B CN110239049 B CN 110239049B
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China
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layer
plate
core
flow distribution
machine head
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CN110239049A (en
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陈镜华
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KAIPING AKEI PLASTIC MACHINERY MOLD FACTORY
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KAIPING AKEI PLASTIC MACHINERY MOLD FACTORY
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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
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0017—Combinations of extrusion moulding with other shaping operations combined with blow-moulding or thermoforming
    • 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
    • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
    • B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
    • 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
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/305—Extrusion nozzles or dies having a wide opening, e.g. for forming sheets
    • B29C48/307—Extrusion nozzles or dies having a wide opening, e.g. for forming sheets specially adapted for bringing together components, e.g. melts within the die
    • 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
    • B29C48/695—Flow dividers, e.g. breaker plates
    • B29C48/70—Flow dividers, e.g. breaker plates comprising means for dividing, distributing and recombining melt flows
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/92—Measuring, controlling or regulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/92609—Dimensions
    • B29C2948/92647—Thickness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/92704—Temperature

Abstract

The invention discloses a four-layer three-machine-head plastic extruder which adopts four-layer plastic feeding and a three-machine-head structure and can synchronously extrude three plastic cup blanks; the servo oil cylinder product thickness regulating structure is adopted, so that the linkage plate and the thickness adjusting screw rod can be stably and smoothly driven to do linear reciprocating motion; each machine head has an independent temperature control function, and the molten plastics of each main flow channel flow into the corresponding core sleeve from the corresponding flow distribution plate through the corresponding machine head, and are extruded and molded from the die structure in time and quickly. In addition, the feeding runners of the flow distribution plates of the inner layer, the inner two layer and the inner three layer all adopt spiral runners, so that a blank is obtained to be distributed on each layer in a good circumference manner, and the feeding runner of the flow distribution plate of the outer layer adopts a heart-shaped runner, so that a product has good appearance; the thick and thin adjusting screw not only functions as an extrusion screw, but also can adjust the position of the slide core through the height and the thickness thereof to realize the thickness of the plastic cup. The plastic extruder is suitable for use with PE, PA, EVOH and other plastic material.

Description

Four-layer three-machine-head plastic extruder
Technical Field
The invention relates to the technical field of blow molding extruders, in particular to a four-layer three-head plastic extruder capable of realizing synchronous extrusion of a four-layer structure and a three-cavity die head.
Background
The machine head of the plastic extruder is a key part for molding products in plastic processing and is used for meeting the requirement of product molding in a plastic extrusion process, the screw type plastic extruder is a common extrusion device, the screw type plastic extruder can fully plasticize and uniformly mix materials by means of pressure and shearing force generated by rotation of a screw, then extrudes a material blank through a die, finally, the material blank is subjected to closed blow molding in a die cavity, and the product is obtained after cooling and shaping.
When the traditional plastic extruder is used for extruding at present, molten plastics of all layers cannot be uniformly distributed in time, so that the shape of a product is unstable and the thickness of the product is non-uniform; and the machine head pressure provided by the extrusion screw rod is only relied on, the machine head pressure of the process requirement cannot be achieved, and the specified technical requirement cannot be met. The basic reason is that the pressure drop and the residence time of the materials along the way from the inlet of the machine head to the outlet of the mouth die are not equal; when the molten materials of each layer are converged in the flow channel of the composite zone, the axial flow rate and the temperature distribution of the molten materials of each layer in the circumferential direction of the neck ring die are uniform and inconsistent, so that the thickness deviation is large, and the condition of non-uniform thickness is caused; and the machine head flow channels of the plastics of each layer are not in an independent temperature control and segmented temperature control mode, so that a blank is not obtained to obtain good circumferential distribution on each layer. Therefore, the existing conventional plastic extruders do not have the capability to be optimized accordingly and solutions that avoid the above-mentioned drawbacks.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a four-layer three-head plastic extruder which adopts four-layer plastic feeding and a three-head structure and can synchronously extrude three plastic cup blanks; the thickness regulating structure of the servo oil cylinder product is adopted, the corresponding linkage plate and the thickness regulating screw rod can be stably and smoothly driven to do linear reciprocating motion, each machine head of the plastic extruder has an independent temperature control function, the temperature control of at least 26 sections is realized, the molten plastic of each layer of main flow channel flows into the corresponding core sleeve from the corresponding flow distribution plate through the corresponding machine head, and the molten plastic is extruded and molded from the die structure in time and rapidly. In addition, the feeding runners of the inner layer splitter plate, the inner two-layer splitter plate and the inner three-layer splitter plate are all spiral runners, so that a good circumferential distribution of the blanks on each layer is achieved, and the feeding runner of the outer layer splitter plate is a heart-shaped runner, so that a product has a good appearance; the thick and thin adjusting screw not only acts as an extrusion screw, but also can realize the thickness adjustment of the plastic blank by adjusting the height of the thick and thin adjusting screw and the position of the thick and thin adjusting slide core. The plastic extruder is suitable for use with PE, PA, EVOH and other plastic material.
The technical scheme adopted by the invention for solving the technical problems is as follows: a four-layer three-machine-head plastic extruder comprises a splitter plate component with four splitter plates, a feeding pipe component connected with the splitter plates corresponding to the four splitter plates, a linkage rod penetrating through the splitter plate component from top to bottom and fixedly installed with the splitter plate component, a bearing plate and a connecting rod connecting plate arranged at the upper end of the linkage rod, a rubber drawing head bottom plate strut arranged at the four corners of the connecting rod connecting plate, a linkage plate penetrating through and installed and matched with the rubber drawing head bottom plate strut, a rubber drawing head bottom plate installed at the top of the rubber drawing head bottom plate strut in a connected mode, a servo oil cylinder installed on the rubber drawing head bottom plate, a rubber drawing head connecting nut installed at the power output end of the servo oil cylinder and fixedly connected and linked with the linkage plate, an oil-containing copper sleeve and a copper sleeve pressing plate installed between the top of the rubber drawing head bottom plate strut and the rubber drawing head bottom plate to realize linkage of the rubber drawing head bottom plate, three thickness adjusting screws, The bushing structure comprises a first machine head body arranged at the lower end of a linkage rod, a second machine head body installed and spliced with the bottom of the first machine head body, core sleeve assemblies arranged in the first machine head body and the second machine head body, a machine head core installed at the bottom of the second machine head body, a thickness adjusting sliding core installed on the outer side of the middle part of the machine head core, a machine head body gland installed on the outer side of the bottom of the machine head core, a sliding sleeve seat installed in a matched manner with the machine head body gland, a thickness adjusting sliding sleeve installed in a matched manner with the thickness adjusting sliding core through the sliding sleeve seat, a bushing adjusting seat installed at the bottom of the thickness adjusting sliding sleeve, a bushing cup core installed in a matched manner corresponding to the thickness adjusting sliding sleeve, a bushing pressing plate installed and matched with the bushing adjusting seat and a bushing adjusting block arranged on the bushing; the feeding pipe assembly comprises an inner three-layer feeding pipe, an inner two-layer feeding pipe, an inner feeding pipe and an outer feeding pipe, the core sleeve assembly of the first machine head body comprises an inner core sleeve and an inner two-layer core sleeve, and the core sleeve assembly of the second machine head body comprises an inner three-layer core sleeve and an outer core sleeve; the flow distribution plate assembly comprises an inner layer flow distribution plate, an inner two-layer flow distribution plate, an inner three-layer flow distribution plate, an outer layer flow distribution plate, spiral flow channels and a core flow channel, wherein the inner layer flow distribution plate is connected with an inner inlet pipe and an inner core sleeve, the inner two-layer flow distribution plate is connected with an inner two-layer inlet pipe and an inner two-layer core sleeve, the inner three-layer flow distribution plate is connected with an inner three-layer inlet pipe and an inner three-layer core sleeve, the outer layer flow distribution plate is connected with an outer inlet pipe and an outer core sleeve, and the core flow channel of the outer layer flow distribution plate is a core flow channel.
The principle of the four-layer three-head plastic extruder is as follows: the servo oil cylinder is opened, the power output end of the servo oil cylinder drives the glue drawing head to be connected with the nut, the glue drawing head connecting nut and the linkage plate to move up and down, the linkage moves along the track of the glue drawing head bottom plate support and synchronously drives the thickness adjusting screw rod to move up and down, when the thickness adjusting screw rod moves upwards, plastic raw materials of all layers flow into the corresponding core sleeves through the flow channels of the respective flow distribution plates and are distributed in good circumference on each layer, and the thickness adjusting screw rod moves downwards and penetrates through all machine head bodies to extrude the plastic raw materials corresponding to all the core sleeves from the mouth mold cup core, so that the plastic extrusion process is completed.
Furthermore, one end of the inner three-layer feeding pipe is provided with an inner three-layer connecting flange, and the other end of the inner three-layer feeding pipe is provided with an inner three-layer feeding flange which is mutually connected with the flow distribution plate assembly; one end of the inner second-layer feeding pipe is provided with an inner second-layer connecting flange, and the other end of the inner second-layer feeding pipe is provided with an inner second-layer feeding flange which is mutually connected with the flow distribution plate component; one end of the inner layer feeding pipe is provided with an inner layer connecting flange, and the other end of the inner layer feeding pipe is provided with an inner layer feeding flange which is mutually connected with the flow distribution plate assembly; outer layer inlet pipe one end is equipped with outer layer flange, and the other end is equipped with the outside feeding flange with flow distribution plate subassembly interconnect.
Furthermore, the bottom of the flow distribution plate assembly is also provided with an inner layer adjusting rod, an inner two-layer adjusting rod and an inner three-layer adjusting rod, and the bottom of each adjusting rod is provided with a corresponding adjusting rod screw and an adjusting rod gland; the back of reposition of redundant personnel board subassembly is equipped with outer regulation pole and outer regulation pole gland.
Furthermore, a one-way thrust ball bearing is sleeved on the outer side of the top of the thickness adjusting screw rod, the one-way thrust ball bearing is fixedly connected with a bearing fixing nut, the bearing fixing nut is fixedly installed with the bottom of the linkage plate, and a bearing gland is arranged on the one-way thrust ball bearing; the thickness adjusting screw tightening nut is sleeved on the outer side of the bottom of the thickness adjusting screw, and the thickness adjusting screw nut is installed on the outer side of the thickness adjusting screw tightening nut.
Furthermore, a heat insulation plate positioned below the support plate is further arranged on the linkage rod, and a positioning plate is arranged at the bottom of the heat insulation plate.
Furthermore, first positioning pins for mutual positioning are arranged between the splitter plates of each layer of the splitter plate assembly, second positioning pins are further arranged between the inner core sleeve and the inner second core sleeve, and third positioning pins are further arranged between the inner third core sleeve and the outer core sleeve.
Furthermore, a locking screw for locking the thickness adjusting sliding core and the head body gland is also arranged in the head core.
In conclusion, the four-layer three-head plastic extruder disclosed by the invention adopts four-layer plastic feeding and a three-head structure, and can synchronously extrude three plastic cup blanks; the thickness regulating structure of the servo oil cylinder product is adopted, the corresponding linkage plate and the thickness regulating screw rod can be stably and smoothly driven to do linear reciprocating motion, each machine head of the plastic extruder has an independent temperature control function and has temperature control of at least 26 sections, and molten plastic of each layer of main flow channel flows into the corresponding core sleeve from the corresponding flow distribution plate through the corresponding machine head and is extruded and molded from the die structure in time and rapidly. In addition, the feeding runners of the inner layer splitter plate, the inner two-layer splitter plate and the inner three-layer splitter plate are all spiral runners, so that a good circumferential distribution of the blanks on each layer is achieved, and the feeding runner of the outer layer splitter plate is a heart-shaped runner, so that a product has a good appearance; the thick and thin adjusting screw not only acts as an extrusion screw, but also can realize the thickness adjustment of the plastic blank by adjusting the height of the thick and thin adjusting screw and the position of the thick and thin adjusting slide core. The plastic extruder is suitable for use with PE, PA, EVOH and other plastic material.
Drawings
FIG. 1 is an exploded view of a four-layer three-head plastic extruder according to example 1 of the present invention;
FIG. 2 is a rear view of a four-layer three-head plastic extruder according to example 1 of the present invention;
FIG. 3 is a right side view of a four-layer three-head plastic extruder according to example 1 of the present invention;
fig. 4 is a bottom view of a four-layer three-head plastic extruder of example 1 of the present invention.
Detailed Description
Example 1
The four-layer three-head plastic extruder described in this embodiment 1, as shown in fig. 1, fig. 2, fig. 3 and fig. 4, comprises a splitter plate assembly 33 having four splitter plates, a feeding tube assembly connected to each splitter plate, a linkage rod 1 passing through the splitter plate assembly from top to bottom and fixedly mounted to the splitter plate assembly, a support plate 2 and a connecting rod connecting plate 3 disposed at the upper end of the linkage rod, a tab base plate strut 4 mounted at four corners of the connecting rod connecting plate, a linkage plate 5 passing through the tab base plate strut and fixedly mounted to the linkage plate, a tab base plate 6 mounted to the top of the tab base plate strut, a servo cylinder 7 mounted to the tab base plate, a tab connection nut 8 and a tab connection nut 9 mounted to the power output end of the servo cylinder and fixedly connected to the linkage plate, an oil-containing copper sleeve 10 and a copper sleeve pressing plate 11 mounted between the top of the tab base plate strut and the tab base plate for linkage, The bottom of the linkage plate is fixedly provided with three thickness adjusting screw rods 12 which are uniformly distributed and linked with the connecting plate, a first machine head body 13 arranged at the lower end of the linkage plate, a second machine head body 14 which is spliced with the bottom of the first machine head body, core sleeve components which are arranged in the first machine head body and the second machine head body, a machine head core 15 arranged at the bottom of the second machine head body, a thickness adjusting slide core 16 arranged at the outer side of the middle part of the machine head core, and a machine head body gland 17 arranged at the outer side of the bottom of the machine head core, a sliding sleeve seat 18 which is matched with a machine head body gland for installation, a thickness adjusting sliding sleeve 19 which passes through the sliding sleeve seat and is matched with a thickness adjusting sliding core for installation, a neck mold adjusting seat 20 which is installed at the bottom of the thickness adjusting sliding sleeve, a neck mold cup core 21 which is matched with the thickness adjusting sliding sleeve for installation, a neck mold pressing plate 22 which is installed and matched with the neck mold adjusting seat and a neck mold adjusting block 23 which is arranged on the neck mold cup core are arranged on the outer side of the neck mold cup core; the feed pipe assembly comprises an inner three-layer feed pipe 24, an inner two-layer feed pipe 25, an inner feed pipe 26 and an outer feed pipe 27, the core sleeve assembly of the first machine head body comprises an inner core sleeve 28 and an inner two-layer core sleeve 29, and the core sleeve assembly of the second machine head body comprises an inner three-layer core sleeve 30 and an outer core sleeve 31; the flow distribution plate assembly comprises an inner layer flow distribution plate 32, an inner layer feeding pipe, an inner layer core sleeve, an inner layer two-layer flow distribution plate 34, an inner layer three-layer flow distribution plate 35, an outer layer feeding pipe, an inner layer three-layer flow distribution plate 36, a spiral flow passage and a core flow passage, wherein the inner layer feeding pipe and the inner layer core sleeve are all connected with each other, the inner layer two-layer flow distribution plate 34 is connected with the inner layer two-layer feeding pipe and the inner layer two-layer core sleeve, the inner layer three-layer flow distribution plate 35 is connected with the inner layer three-layer core sleeve, the outer layer flow distribution plate 36 is connected with the outer layer feeding pipe and the outer layer core.
The principle of the four-layer three-head plastic extruder is as follows: the servo oil cylinder is opened, the power output end of the servo oil cylinder drives the glue drawing head to be connected with the nut, the glue drawing head connecting nut and the linkage plate to move up and down, the linkage moves along the track of the glue drawing head bottom plate support and synchronously drives the thickness adjusting screw rod to move up and down, when the thickness adjusting screw rod moves upwards, plastic raw materials of all layers flow into the corresponding core sleeves through the flow channels of the respective flow distribution plates and are distributed in good circumference on each layer, and the thickness adjusting screw rod moves downwards and penetrates through all machine head bodies to extrude the plastic raw materials corresponding to all the core sleeves from the mouth mold cup core, so that the plastic extrusion process is completed.
In this embodiment, one end of the inner three-layer feeding pipe is provided with an inner three-layer connecting flange 37, and the other end of the inner three-layer feeding pipe is provided with an inner three-layer feeding flange 38 which is connected with the flow distribution plate assembly; one end of the inner second-layer feeding pipe is provided with an inner second-layer connecting flange 39, and the other end of the inner second-layer feeding pipe is provided with an inner second-layer feeding flange 40 which is mutually connected with the flow distribution plate component; one end of the inner layer feeding pipe is provided with an inner layer connecting flange 41, and the other end of the inner layer feeding pipe is provided with an inner layer feeding flange 42 which is mutually connected with the flow distribution plate assembly; an outer layer feed pipe is provided with an outer layer connecting flange 43 at one end and an outer side feed flange 44 at the other end for interconnection with the diverter plate assembly.
In this embodiment, the bottom of the flow distribution plate assembly is further provided with an inner layer adjusting rod 45, an inner second layer adjusting rod 46 and an inner third layer adjusting rod 47, and the bottom of each adjusting rod is provided with a corresponding adjusting rod screw 48 and an adjusting rod gland 49; an outer adjusting rod 50 and an outer adjusting rod gland 51 are arranged on the back of the splitter plate component.
In this embodiment, a one-way thrust ball bearing 52 is sleeved outside the top of the thickness adjusting screw, the one-way thrust ball bearing is fixedly connected with a bearing fixing nut 53, the bearing fixing nut is fixedly installed with the bottom of the linkage plate, and a bearing gland 54 is arranged on the one-way thrust ball bearing; the thickness adjusting screw tightening nut 55 is sleeved on the outer side of the bottom of the thickness adjusting screw, and the thickness adjusting screw nut 56 is installed on the outer side of the thickness adjusting screw tightening nut.
In this embodiment, the linkage rod is further provided with a heat insulation plate 57 located below the support plate, and a positioning plate 58 is installed at the bottom of the heat insulation plate.
In this embodiment, first positioning pins 59 for positioning each other are disposed between the splitter plates of the splitter plate assembly, a second positioning pin 60 is further disposed between the inner core sleeve and the inner second core sleeve, and a third positioning pin 61 is further disposed between the inner third core sleeve and the outer core sleeve.
In this embodiment, a locking screw 62 for locking the thickness adjusting slide core and the head body gland is further provided in the head core.
The four-layer three-machine-head plastic extruder adopts four-layer plastic feeding and a three-machine-head structure, and can synchronously extrude three plastic cup blanks; the servo oil cylinder is used as a product thickness regulating structure, the servo oil cylinder can stably and smoothly drive the corresponding linkage plate and the thickness adjusting screw rod to do linear reciprocating motion, each machine head of the plastic extruder has an independent temperature control function and has temperature control of at least 26 sections, and molten plastic of each layer of main flow channel flows into the corresponding core sleeve from the corresponding flow distribution plate through the corresponding machine head and is extruded and molded from the die structure in time and rapidly. In addition, the feeding runners of the inner layer splitter plate, the inner two-layer splitter plate and the inner three-layer splitter plate are all spiral runners, so that a good circumferential distribution of the blanks on each layer is achieved, and the feeding runner of the outer layer splitter plate is a heart-shaped runner, so that a product has a good appearance; the thick and thin adjusting screw not only acts as an extrusion screw, but also can realize the thickness adjustment of the plastic blank by adjusting the height of the thick and thin adjusting screw and the position of the thick and thin adjusting slide core. The plastic extruder is suitable for use with PE, PA, EVOH and other plastic material.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the structure of the present invention in any way. Any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention still fall within the scope of the technical solution of the present invention.

Claims (7)

1. A four-layer three-machine-head plastic extruder is characterized by comprising a splitter plate component with four layers of splitter plates, a feeding pipe component connected with the splitter plates corresponding to the four layers of splitter plates, a linkage rod which penetrates through the splitter plate component from top to bottom and is fixedly installed with the splitter plate component, a supporting plate and a connecting rod connecting plate which are arranged at the upper end of the linkage rod, rubber drawing head bottom plate pillars arranged at the four corners of the connecting rod connecting plate, a linkage plate which penetrates through the rubber drawing head bottom plate pillars and is matched with the rubber drawing head bottom plate pillars in an installation mode, a rubber drawing head bottom plate which is installed at the tops of the rubber drawing head bottom plate pillars in a connection mode, a servo oil cylinder installed on the rubber drawing head bottom plate, a rubber drawing head connecting nut and a rubber drawing head connecting nut which are installed at the power output end of the servo cylinder and are fixedly connected and linked with the linkage plate, an oil-containing copper sleeve and a copper sleeve pressing plate which are installed between the tops, The bushing structure comprises a first machine head body arranged at the lower end of a linkage rod, a second machine head body installed and spliced with the bottom of the first machine head body, core sleeve assemblies arranged in the first machine head body and the second machine head body, a machine head core installed at the bottom of the second machine head body, a thickness adjusting sliding core installed on the outer side of the middle part of the machine head core, a machine head body gland installed on the outer side of the bottom of the machine head core, a sliding sleeve seat installed in a matched manner with the machine head body gland, a thickness adjusting sliding sleeve installed in a matched manner with the thickness adjusting sliding core through the sliding sleeve seat, a bushing adjusting seat installed at the bottom of the thickness adjusting sliding sleeve, a bushing cup core installed in a matched manner corresponding to the thickness adjusting sliding sleeve, a bushing pressing plate installed and matched with the bushing adjusting seat and a bushing adjusting block arranged on the bushing; the feeding pipe assembly comprises an inner three-layer feeding pipe, an inner two-layer feeding pipe, an inner feeding pipe and an outer feeding pipe, the core sleeve assembly of the first machine head body comprises an inner core sleeve and an inner two-layer core sleeve, and the core sleeve assembly of the second machine head body comprises an inner three-layer core sleeve and an outer core sleeve; the flow distribution plate assembly comprises an inner layer flow distribution plate, an inner two-layer flow distribution plate, an inner three-layer flow distribution plate, an outer layer flow distribution plate, spiral flow channels and a core flow channel, wherein the inner layer flow distribution plate is connected with an inner inlet pipe and an inner core sleeve, the inner two-layer flow distribution plate is connected with an inner two-layer inlet pipe and an inner two-layer core sleeve, the inner three-layer flow distribution plate is connected with an inner three-layer inlet pipe and an inner three-layer core sleeve, the outer layer flow distribution plate is connected with an outer inlet pipe and an outer core sleeve, and the core flow channel of the outer layer flow distribution plate is a core flow channel.
2. The four-layer three-head plastic extruder as claimed in claim 1, wherein one end of the inner three-layer feeding pipe is provided with an inner three-layer connecting flange, and the other end is provided with an inner three-layer feeding flange which is connected with the splitter plate assembly; one end of the inner second-layer feeding pipe is provided with an inner second-layer connecting flange, and the other end of the inner second-layer feeding pipe is provided with an inner second-layer feeding flange which is mutually connected with the flow distribution plate component; one end of the inner layer feeding pipe is provided with an inner layer connecting flange, and the other end of the inner layer feeding pipe is provided with an inner layer feeding flange which is mutually connected with the flow distribution plate assembly; outer layer inlet pipe one end is equipped with outer layer flange, and the other end is equipped with the outside feeding flange with flow distribution plate subassembly interconnect.
3. The four-layer three-head plastic extruder as claimed in claim 2, wherein the bottom of the splitter plate assembly is further provided with an inner layer adjusting rod, an inner two-layer adjusting rod and an inner three-layer adjusting rod, and the bottom of each adjusting rod is provided with a corresponding adjusting rod screw and an adjusting rod gland; the back of reposition of redundant personnel board subassembly is equipped with outer regulation pole and outer regulation pole gland.
4. The four-layer three-head plastic extruder as claimed in claim 3, wherein a one-way thrust ball bearing is sleeved outside the top of the thickness adjusting screw, the one-way thrust ball bearing is fixedly connected with a bearing fixing nut, the bearing fixing nut is fixedly mounted with the bottom of the linkage plate, and a bearing gland is arranged on the one-way thrust ball bearing; the thickness adjusting screw tightening nut is sleeved on the outer side of the bottom of the thickness adjusting screw, and the thickness adjusting screw nut is installed on the outer side of the thickness adjusting screw tightening nut.
5. The four-layer three-head plastic extruder as claimed in claim 4, wherein the linkage rod is further provided with a heat insulation plate positioned below the support plate, and the bottom of the heat insulation plate is provided with a positioning plate.
6. The plastic extruder as claimed in claim 5, wherein a first positioning pin is provided between the splitter plates, a second positioning pin is provided between the inner core sleeve and the inner core sleeve, and a third positioning pin is provided between the inner core sleeve and the outer core sleeve.
7. The plastic extruder as claimed in claim 6, wherein the core is further provided with a locking screw for locking the thickness adjusting slide core and the head body gland.
CN201910510894.1A 2019-06-13 2019-06-13 Four-layer three-machine-head plastic extruder Active CN110239049B (en)

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US4936768A (en) * 1986-03-25 1990-06-26 Lupke Manfred Arno Alfred Extrusion die for externally ribbed plastic tubing
US7074027B2 (en) * 2001-02-19 2006-07-11 Starita Joseph M Extrusion die and method for forming dual wall corrugated plastic pipe and dual wall plastic pipe having a foam annular core
CN204977372U (en) * 2015-08-18 2016-01-20 苏州金纬中空技术有限公司 Double -deck head structure of blowing machine
CN206551465U (en) * 2017-01-09 2017-10-13 大禹节水集团股份有限公司 A kind of PVC drip-irrigation belt production lines special had die assembly

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