CN114523644A - Polyethylene large-caliber solid-wall pipe forming die - Google Patents
Polyethylene large-caliber solid-wall pipe forming die Download PDFInfo
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- CN114523644A CN114523644A CN202210141211.1A CN202210141211A CN114523644A CN 114523644 A CN114523644 A CN 114523644A CN 202210141211 A CN202210141211 A CN 202210141211A CN 114523644 A CN114523644 A CN 114523644A
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- 239000004698 Polyethylene Substances 0.000 title claims abstract description 40
- -1 Polyethylene Polymers 0.000 title claims abstract description 36
- 229920000573 polyethylene Polymers 0.000 title claims abstract description 36
- 238000001125 extrusion Methods 0.000 claims abstract description 32
- 239000000498 cooling water Substances 0.000 claims abstract description 24
- 239000000463 material Substances 0.000 claims abstract description 20
- 238000007493 shaping process Methods 0.000 claims abstract description 17
- 238000010438 heat treatment Methods 0.000 claims abstract description 10
- 238000004513 sizing Methods 0.000 claims abstract description 10
- 238000005520 cutting process Methods 0.000 claims abstract description 7
- 238000004519 manufacturing process Methods 0.000 claims abstract description 7
- 239000010410 layer Substances 0.000 claims description 32
- 238000009826 distribution Methods 0.000 claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 230000009471 action Effects 0.000 claims description 14
- 230000006835 compression Effects 0.000 claims description 13
- 238000007906 compression Methods 0.000 claims description 13
- 230000007704 transition Effects 0.000 claims description 13
- 239000002344 surface layer Substances 0.000 claims description 8
- 239000000443 aerosol Substances 0.000 claims description 6
- 239000007921 spray Substances 0.000 claims description 6
- 238000000576 coating method Methods 0.000 claims description 4
- 239000004809 Teflon Substances 0.000 claims description 3
- 229920006362 Teflon® Polymers 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims description 2
- 230000008018 melting Effects 0.000 claims description 2
- 239000003595 mist Substances 0.000 claims description 2
- 230000001404 mediated effect Effects 0.000 claims 3
- 239000011248 coating agent Substances 0.000 claims 2
- 239000012530 fluid Substances 0.000 claims 2
- 238000007599 discharging Methods 0.000 claims 1
- 238000005452 bending Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract description 2
- 230000008093 supporting effect Effects 0.000 abstract description 2
- 241000723353 Chrysanthemum Species 0.000 description 9
- 235000007516 Chrysanthemum Nutrition 0.000 description 9
- 239000003292 glue Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 239000004594 Masterbatch (MB) Substances 0.000 description 5
- 239000000155 melt Substances 0.000 description 4
- 239000011229 interlayer Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 238000007711 solidification Methods 0.000 description 3
- 230000008023 solidification Effects 0.000 description 3
- 230000004927 fusion Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000012768 molten material Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 210000003437 trachea Anatomy 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
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
- B29C48/16—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
- 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
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/911—Cooling
- B29C48/9115—Cooling of hollow articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
- B29K2023/04—Polymers of ethylene
- B29K2023/06—PE, i.e. polyethylene
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention relates to a polyethylene large-caliber solid-wall pipe forming die, which belongs to the technical field of large-caliber pipe manufacturing, and is sequentially provided with an inner layer extrusion main machine, a chrysanthemum-type die body, a first sizing cooling water tank, a high-frequency heating oven, a supply die body, a second sizing cooling water tank, a tractor and a cutting machine, wherein one side of the supply die body is provided with an outer layer extrusion main machine; the invention can extrude the large-diameter pipe in a mode of feeding in stages and in many times, the inner layer is cooled and shaped preferentially, and has a certain supporting function on the sizing material on the outer layer, thereby reducing the pipe bending caused by self weight and the problem of melt sag; the invention improves the problem of melt sag from the direction of quickly shaping the pipe and changing the wall thickness, and has remarkable effect.
Description
Technical Field
The invention belongs to the technical field of large-caliber pipe manufacturing, and particularly relates to a polyethylene large-caliber solid-wall pipe forming die.
Background
The production process of the PE pipe comprises the following steps: and extruding the pipe blank in the molten state from an annular neck mold, sizing the pipe blank, and then spraying and cooling the surface of the pipe blank to cool and solidify the pipe blank to obtain the PE pipe.
When a large-caliber thick-wall pipe is produced, because the thermal conductivity of PE is low and radial solidification is slow, the solidification time of the inner side of the pipe wall is long, and the polymer melt on the inner wall of the pipe flows from top to bottom, namely the phenomenon of 'fusion sag'. The phenomenon of 'welding and hanging' can directly cause the uneven wall thickness of the pipe, the uneven inner wall of the pipe and the influence on the pipe structure.
Factors influencing the phenomenon of the 'sag' include temperature, die concentricity, traction speed, material properties and the like, no matter how the process is controlled, PE melt is a free section before leaving an extruder die and entering a sizing device, and a pipe blank can be bent and deformed under the action of the gravity of the material. Therefore, the modification of the equipment and the mold involved in the processing has no obvious effect.
Aiming at the problem of 'melt sag', the industry mainly selects an anti-melt sag raw material to improve, and the cost of the raw material is higher, and the selectivity of the raw material of the large-aperture pipe is limited.
Disclosure of Invention
In order to solve the technical problems mentioned in the background technology, the invention provides a polyethylene large-caliber solid-wall pipe forming die.
The purpose of the invention can be realized by the following technical scheme:
a polyethylene large-caliber solid-wall pipe forming die is sequentially provided with an inner layer extrusion main machine, a chrysanthemum-type die body, a first sizing cooling water tank, a high-frequency heating oven, a supply die body, a second sizing cooling water tank, a tractor and a cutting machine from a feeding end to an outlet pipe end, wherein the outer layer extrusion main machine is arranged on one side of the supply die body;
the forming process of the polyethylene pipe comprises the following steps: the polyethylene master batch is melted and extruded into a chrysanthemum type die body by an inner layer extrusion host machine, an inner pipe blank is extruded into the chrysanthemum type die body, a first shaping cooling water tank cools and shapes the inner pipe blank, then a high-frequency heating oven heats and melts the surface layer of the outer wall of the inner pipe blank, the outer layer extrusion host machine melts the polyethylene master batch and then extrudes the polyethylene master batch into a supply die body, the supply die body coats a layer of molten material on the surface of the inner pipe blank, then a second shaping cooling water tank cools and shapes the pipe, a tractor assists in drawing the pipe to move in the process, a cutting machine cuts the polyethylene master batch to a fixed length, and the production of the polyethylene pipe is completed.
The chrysanthemum type die body comprises a die head connector, the interior of the die head connector is communicated with the inner layer extrusion host, one end of the die head connector is fixedly connected with the extrusion end of the inner layer extrusion host through a connecting flange, a flow distribution plate is fixed at the other end of the die head connector, an outer transition body is fixed at the other side of the flow distribution plate, a die is fixed at one side of the outer transition body, a flow distribution cone is fixed at one side of the middle part of the flow distribution plate, which is located at the die head connector, a compression body is fixed at one side of the middle part of the flow distribution plate, a core rod is fixed at the other end of the compression body, and the core rod is located inside the die;
the molten polyethylene glue is extruded into the interior of the machine head connector, guided into the shunting holes of the shunting plate under the guiding action of the shunting cone, preliminarily formed through the outer transition body and the compression body, and then extruded and formed into an inner tube blank in an interlayer between the neck mold and the core rod.
The chrysanthemum formula die body still includes the die orifice subassembly, this die orifice subassembly is including a plurality of cassette that encircles the bush tip, cassette equal embedding fixed mounting is on the bush, all rotate in the bayonet socket of cassette and install the adjustment sheet, the adjustment sheet is kept away from cassette one end and is provided with the hinge, the one end and the adjustment sheet swing joint of hinge, the other end swing joint of hinge has intermediary ring of a plurality of groups, the one end of each intermediary ring of group all is provided with the action feed cylinder, the installation end of action feed cylinder all with bush fixed connection, through the outside seesaw of action feed cylinder drive intermediary ring at the bush, thereby drive partly adjustment sheet and draw in the inboard in step or expand in the step to the outside, the wall thickness of pipe in the adjustment.
Furthermore, the inner wall of the mouth mold and the outer wall of the core rod are coated with Teflon coatings, so that a compact film layer is formed on the surface, the adhesion of polyethylene sizing materials and a contact surface is reduced, and the wall thickness consistency of the inner blank pipe is improved.
Furthermore, an inner lining pipe is arranged inside the mandrel, the inner lining pipe extends to the outer side of the mandrel and is communicated and fixed with an aerosol spray head, the inner lining pipe is communicated with a water inlet pipe and a gas inlet pipe, the water inlet pipe and the gas inlet pipe both penetrate through the compression body and the flow distribution plate and penetrate out of the side wall of the flow distribution plate to be respectively communicated with an external gas pipe and a water pipe, water vapor is sprayed from the inner wall of the inner blank pipe after the inner blank pipe is formed, the inner blank pipe is in a free section after being separated from the mandrel, the inner wall of the inner blank pipe is uneven under the action of fusion, particularly serious in large-diameter and thick-wall pipes, through the arrangement of the aerosol spray head, the water mist is sprayed from the inner wall of the inner pipe blank after the inner blank pipe is separated from the mandrel, the inner wall of the inner blank pipe is rapidly cooled, the inner wall of the inner blank pipe is preferentially cooled and formed from the inner wall, so that the inner wall of the inner blank pipe is almost kept in a smooth state when being separated from the mandrel, and is rapidly cooled and formed by matching with a first forming cooling water tank, and 4, the molten sag is reduced.
Furthermore, the supply die body comprises a shunting body and an outer die body, the shunting body is fixedly connected with the outer die body in a sealing mode, a feeding channel is formed between the shunting body and the end face, close to the outer die body, of the shunting body, a distributing cavity is formed in the outer die body, the distributing cavity is communicated with the feeding channel and the extrusion end of the outer layer extrusion main machine respectively, molten polyethylene glue is extruded into the distributing cavity to be distributed in an annular mode, and then the molten polyethylene glue is extruded from the feeding channel and coated on the surface of the inner blank pipe with the surface layer molten.
The invention has the beneficial effects that:
1. according to the invention, the large-aperture pipe is prepared by a graded multiple feeding mode, the inner layer is preferentially cooled and shaped, a certain supporting effect is provided for the outer layer rubber, the pipeline bending caused by self weight is reduced, and the problem of melt sag is reduced.
2. According to the invention, the chrysanthemum-type die body is arranged at the end part of the inner layer extrusion main machine, and the wall thickness of the inner tube blank is adjusted through the die orifice assembly at the end part of the chrysanthemum-type die body, so that the uniformity of the wall thickness is ensured.
3. According to the invention, the aerosol spray nozzle is arranged at the core rod, water vapor is formed by high-pressure gas and water, the inner wall of the inner tube blank is rapidly cooled, and the inner tube blank is rapidly shaped by matching with the first shaping cooling water tank, so that the melt sag is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural view of a large-diameter solid-wall polyethylene pipe forming mold according to the present invention;
FIG. 2 is a schematic view of the external structure of the chrysanthemum-like mold body according to the present invention;
FIG. 3 is a schematic diagram of a half-section structure of a chrysanthemum-type mold body according to the present invention;
FIG. 4 is a schematic view of a partial structure of a chrysanthemum-based mold body according to the present invention;
FIG. 5 is a schematic view of the mounting structure of the adjustment tab of the present invention;
FIG. 6 is a schematic view of the external structure of the supply mold according to the present invention;
FIG. 7 is a schematic view of a half-section of a supply mold according to the present invention.
In the figure:
100. the inner layer is extruded out of the main machine; 200. a chrysanthemum type die body; 211. a spreader cone; 212. a handpiece connector; 213. an outer transition body; 214. a neck ring mold; 215. a die assembly; 216. an aerosol spray head; 217. a liner tube; 218. a compression body; 219. a flow distribution plate; 220. an air inlet pipe; 221. a water inlet pipe; 222. an intermediate ring; 223. a card holder; 224. a regulating sheet; 225. a hinge; 226. an action push cylinder; 300. a first shaped cooling water tank; 400. high-frequency heating oven; 500. supplying the die body; 511. a flow divider; 512. an outer mold body; 513. a material distributing cavity; 514. a feed channel; 600. a second shaping cooling water tank; 700. a tractor; 800. a cutter; 900. and extruding the outer layer out of the host machine.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to 7, a polyethylene large-caliber solid-wall pipe forming mold is sequentially provided with an inner layer extrusion main machine 100, a chrysanthemum type mold body 200, a first shaping cooling water tank 300, a high-frequency heating oven 400, a supply mold body 500, a second shaping cooling water tank 600, a tractor 700 and a cutting machine 800 from a feed end to an outlet end, wherein an outer layer extrusion main machine 900 is arranged on one side of the supply mold body 500; polyethylene master batches are melted by an inner layer extrusion main machine 100 and extruded into a chrysanthemum type die body 200, an inner pipe blank is extruded into the chrysanthemum type die body 200, the inner pipe blank is cooled and shaped by a first shaping cooling water tank 300, then the surface layer of the outer wall of the inner pipe blank is heated and melted by a high-frequency heating oven 400, the polyethylene master batches are melted by an outer layer extrusion main machine 900 and then extruded into a supply die body 500, the surface of the inner pipe blank is coated with a layer of molten material by the supply die body 500, then the pipe blank is cooled and shaped by a second shaping cooling water tank 600, in the process, a tractor 700 assists in dragging the pipe blank to move, and a cutting machine 800 cuts the pipe blank at a fixed length to complete the production of the polyethylene pipe blank.
The chrysanthemum-shaped die body 200 comprises a die head connecting body 212, the interior of the die head connecting body 212 is communicated with the inner layer extrusion main machine 100, one end of the die head connecting body 212 is fixedly connected with the extrusion end of the inner layer extrusion main machine 100 through a connecting flange, a flow distribution plate 219 is fixed at the other end of the die head connecting body 212, an outer transition body 213 is fixed at the other side of the flow distribution plate 219, a die 214 is fixed at one side of the outer transition body 213, and the die head connecting body 212, the outer transition body 213 of the flow distribution plate 219 and the die are in sealing connection, so that material overflow in the extrusion process is prevented;
a shunting cone 211 is fixed at one side of the middle part of a shunting plate 219, which is positioned at the nose connecting body 212, a compression body 218 is fixed at one side of the middle part of the shunting plate 219, which is positioned at the outer transition body 213, a core rod is fixed at the other end of the compression body 218, the core rod is positioned inside a neck mold 214, molten polyethylene glue is extruded into the nose connecting body 212, the molten polyethylene glue is guided into shunting holes of the shunting plate 219 under the guiding action of the shunting cone 211, and is preliminarily molded through the outer transition body 213 and the compression body 218, then an inner pipe blank is extruded and molded in an interlayer between the neck mold 214 and the core rod, before assembly, Teflon coatings are respectively coated on the inner wall of the neck mold 214 and the outer wall of the core rod, a compact film layer is formed on the surface, the adhesion of the polyethylene glue and a contact surface is reduced, and the wall thickness consistency of the inner pipe blank is improved.
The chrysanthemum-type die body 200 further comprises a die opening assembly 215, the die opening assembly 215 comprises a plurality of clamping seats 223 surrounding the end part of the die 214, the clamping seats 223 are all embedded and fixedly installed on the die 214, adjusting pieces 224 are all rotatably installed in the clamping seats 223, hinges 225 are arranged at the ends, far away from the clamping seats 223, of the adjusting pieces 224, one ends of the hinges 225 are movably connected with the adjusting pieces 224, the other ends of the hinges 225 are movably connected with a plurality of groups of intermediary rings 222, one end of each group of intermediary rings 222 is provided with an action push cylinder 226, the installation ends of the action push cylinders 226 are fixedly connected with the die 214, by operating the push cylinder 226 to drive the intermediate ring 222 to move forward and backward outside the die 214, the adjustment pieces 224 connected to the intermediate ring 222 are synchronously moved inward and inward or synchronously moved outward with the movement of the intermediate ring 222, and the distance between the adjustment pieces 224 and the mandrel rod is adjusted, thereby making it possible to adjust the local thickness of the inner shell in a targeted manner.
Inside of plug is provided with interior bushing 217, interior bushing 217 extends to the outside intercommunication of plug and is fixed with aerial fog shower nozzle 216, interior bushing 217 intercommunication has inlet tube 221 and intake pipe 220, inlet tube 221 and intake pipe 220 all run through compression body 218 and flow distribution plate 219, wear out from the lateral wall of flow distribution plate 219, do not influence the extrusion of interior pipe base, inlet tube 221 and intake pipe 220 respectively with external trachea and water pipe intercommunication, let in water and high-pressure gas in to aerial fog shower nozzle 216 through inlet tube 221 and intake pipe 220 behind the shaping of interior pipe base, inner wall spraying steam at interior pipe base, the first shaping cooling water tank 300 of cooperation, the inside and outside rapid cooling to interior pipe base pipe, make the interior pipe base fast solidification design, alleviate the melt and hang down.
The supply die body 500 comprises a shunt body 511 and an outer die body 512, the shunt body 511 and the outer die body 512 are fixedly connected in a sealing mode, a feeding channel 514 is formed between the end faces, close to each other, of the shunt body 511 and the outer die body 512, a distributing cavity 513 is arranged inside the outer die body 512, the distributing cavity 513 is communicated with the feeding channel 514 and the extrusion end of the outer layer extrusion main machine 900 respectively, molten polyethylene glue is extruded into the distributing cavity 513 to be distributed in a ring shape, and then the molten polyethylene glue is extruded from the feeding channel 514 to be coated on the surface of the inner blank pipe with the surface layer melted.
The working principle of the invention is as follows:
the polyethylene master batch is melted into molten rubber material by the inner layer extrusion host machine 100, the rubber material is extruded by a screw extruder and enters the interior of the machine head connecting body 212, the rubber material is guided into the diversion holes of the diversion plate 219 under the guiding action of the diversion cone 211, the rubber material is uniformly distributed into the gap between the outer transition body 213 and the compression body 218 through the diversion holes and extruded into a tubular shape, then the rubber material is extruded into an inner tube blank in the interlayer between the neck mold 214 and the core rod, water and high-pressure gas are introduced into the aerosol spray head 216 through the water inlet pipe 221 and the air inlet pipe 220, water vapor is sprayed on the inner wall of the inner tube blank, the inner tube blank is subjected to rapid heat exchange and temperature reduction, the first shaping cooling water tank 300 is subjected to temperature reduction from the outside of the inner tube blank, the inner tube blank is rapidly cooled, solidified and shaped, then the high-frequency heating oven 400 is used for heating and melting the surface layer of the outer wall of the inner tube blank, the rubber material is extruded by the outer layer extrusion host machine 900 and is annularly distributed into the material distribution cavity 513, then, the surface of the inner pipe blank melted on the surface layer is extruded and coated from the feeding channel 514, the melted rubber material on the surface of the inner pipe blank is welded with the rubber material extruded by the outer layer extrusion host 900, the inner pipe blank is thickened, then the rubber material on the surface layer is cooled and solidified by the second shaping cooling water tank 600, the pipe is dragged to move under the assistance of the tractor 700 in the process, and the pipe is cut at a fixed length by the cutting machine 800, so that the production of the polyethylene pipe is completed.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing is merely exemplary and illustrative of the principles of the present invention and various modifications, additions and substitutions of the specific embodiments described herein may be made by those skilled in the art without departing from the principles of the present invention or exceeding the scope of the claims set forth herein.
Claims (8)
1. A polyethylene large-caliber solid-wall pipe forming die comprises an inner layer extrusion main machine (100) and a first shaping cooling water tank (300) and is used for extruding and cooling to form an inner pipe blank, and is characterized in that a chrysanthemum-shaped die body (200) is connected between the inner layer extrusion main machine (100) and the first shaping cooling water tank (300);
the chrysanthemum-shaped die body (200) comprises a die opening (214), a die opening component (215) is arranged at the end part of the die opening (214) close to the first shaping cooling water tank (300), die orifice subassembly (215) are including surrounding a plurality of cassette (223) of bush (214) tip, cassette (223) all imbed fixed mounting on bush (214), all rotate in the bayonet socket of cassette (223) and install adjustment sheet (224), adjustment sheet (224) are kept away from cassette (223) one end and are provided with hinge (225), the one end and adjustment sheet (224) swing joint of hinge (225), ring (222) are mediated to the other end swing joint of hinge (225) a plurality of groups, the one end of ring (222) is mediated in each group all is provided with action thrust cylinder (226), the installation end of action thrust cylinder (226) all with bush (214) fixed connection, the outside seesaw of ring (222) in bush (214) is mediated in the drive of action thrust cylinder (226).
2. The forming die of the polyethylene large-caliber solid-wall pipe according to claim 1, further comprising a supply die body (500) arranged at the pipe outlet side of the first sizing cooling water tank (300), wherein the supply die body (500) is communicated with an outer layer extrusion main machine (900) for coating a layer of outer pipe on the surface of the inner pipe blank, and a second sizing cooling water tank (600) is arranged at the pipe outlet side of the supply die body (500).
3. The forming die for the large-caliber polyethylene solid-wall pipe as claimed in claim 1, wherein the daisy-chain die body (200) further comprises a die head connector (212), the interior of the die head connector (212) is communicated with the inner layer extrusion main machine (100), a splitter plate (219) is fixed to the other end of the die head connector (212), an outer transition body (213) is fixed to the other side of the splitter plate (219), one side of the outer transition body (213) is fixed to the die (214), a splitter cone (211) is fixed to one side of the die head connector (212) in the middle of the splitter plate (219), a compression body (218) is fixed to one side of the outer transition body (213) in the middle of the splitter plate (219), a mandrel is fixed to the other end of the compression body (218), and the mandrel is located inside the die (214).
4. The large-caliber solid-wall polyethylene pipe forming die as claimed in claim 3, wherein the inner wall of the die (214) and the outer wall of the core rod are coated with Teflon coating.
5. The polyethylene large-caliber solid-wall pipe forming die according to claim 3, wherein an inner lining pipe (217) is arranged inside the mandrel, the inner lining pipe (217) extends to the outer side of the mandrel and is fixedly communicated with an aerosol spray head (216), the inner lining pipe (217) is communicated with a water inlet pipe (221) and an air inlet pipe (220), and the water inlet pipe (221) and the air inlet pipe (220) both penetrate through the compression body (218) and the splitter plate (219) and penetrate out of the side wall of the splitter plate (219) for rapid water mist heat exchange from the inner wall of the inner pipe blank.
6. The forming die for the large-caliber solid-wall polyethylene pipe as claimed in claim 2, wherein the supply die body (500) comprises a branch fluid (511) and an outer die body (512), the branch fluid and the outer die body are fixedly connected, a feeding channel (514) is formed between the adjacent end surfaces, a material distribution chamber (513) is arranged inside the outer die body (512), and the material distribution chamber (513) is respectively communicated with the feeding channel (514) and an extrusion end of the outer layer extrusion main machine (900).
7. The large-caliber polyethylene solid-wall pipe forming die according to claim 2, wherein a high-frequency heating oven (400) is arranged between the first fixed cooling water tank (300) and the supply die body (500) and is used for heating and melting the surface layer of the inner pipe blank.
8. The forming die for the large-caliber polyethylene solid-wall pipe according to claim 2, wherein a tractor (700) and a cutting machine (800) are sequentially arranged on one side of the second shaping cooling water tank (600) for assisting in discharging the pipe and blanking for integrated production.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210141211.1A CN114523644B (en) | 2022-02-16 | 2022-02-16 | Polyethylene large-caliber solid wall pipe forming die |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN115195074A (en) * | 2022-07-15 | 2022-10-18 | 陈国平 | PE pipe extrusion molding processing method |
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| CN114523644B (en) | 2023-12-26 |
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