PE profile, PE pipeline and forming method thereof

Abstract

The invention relates to the field of pipelines, in particular to a PE profile which at least comprises a first PE layer and a second PE layer, the first PE layer is of a strip-shaped structure, and the second PE layer wraps and is welded to the peripheral side wall of the first PE layer. According to the PE profile, the second PE layer wraps the first PE layer and is welded to the first PE layer, so that the size of the PE profile can be increased, namely, the size of the PE profile is increased by wrapping the core material layer by layer instead of directly extruding and molding the PE profile to a specified size at a time, and the outer wrapping layer can be welded to the core material by utilizing the material characteristics of PE; therefore, the core material can be independently cooled and then is coated with the outer cladding layer to form the PE profile, the problems that a large-size PE profile is directly extruded and processed, internal cooling is slow, and stable forming is difficult are solved, and the PE profile is convenient to manufacture, stable in structure, convenient to control in size, high in yield and good in effect.

Description

Technical Field

[0001] The invention relates to the technical field of pipelines, in particular to a PE profile, a PE pipeline and a forming method thereof. Background Art

[0002] Plastic pipes are used in various fields, such as water supply and drainage systems, heating systems, electrical wiring, and air-conditioning systems in the construction field, water supply and drainage pipes, sewage pipes, and ventilation pipes in municipal construction, irrigation systems in the agricultural field, sewage pipes and chemical transmission in the industrial field, and the application of polyethylene (PE) pipes in gas transportation. Plastic pipes are used in the fields of electricity and communications, the food industry, the medical industry, and so on.

[0003] Chinese patent publication number CN108278421A discloses an assembled plastic pressure pipe, a production mold, a production method, a plastic plate, and a pipe gallery. The plastic pressure pipe body is formed by splicing pipe segments in sequence. Adjacent pipe segments are hot-melt welded, and electric heating wires are provided in the joints. Plastic pipes with a diameter greater than 2m can be produced, which can be used as water supply and drainage pipes. The pipe segments are formed by extrusion.

[0004] If PE material is used to produce large-diameter plastic pipes, larger pipe segments are required. However, due to the processing characteristics of PE, the internal cooling of the profile is slow during extrusion, and the processing and molding of PE pipe segments is very difficult. Summary of the invention

[0005] The purpose of the present invention is to provide a PE profile, a PE pipeline and a forming method thereof, in view of the problem that in the prior art, large-diameter PE pipes are produced by hot-melt welding of PE pipe segments, which requires larger-sized pipe segments. The PE pipe segments are formed by extrusion, but due to the processing characteristics of PE, the internal cooling of the profile is slow during extrusion, and the processing and forming of large-sized PE pipe segments is very difficult.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] In a first aspect, the present invention provides a PE profile, comprising at least a first PE layer and a second PE layer, wherein the first PE layer is in a strip-shaped structure, and the second PE layer is coated on and welded to the surrounding side walls of the first PE layer.

[0008] Those skilled in the art can understand that, the first PE layer is used as the core material of the second PE layer, and after the second PE layer is coated and welded to the surrounding side walls of the first PE layer, it can be regarded as a new core material, and a new PE layer can continue to be coated on the outside. Therefore, the above-mentioned first PE layer and the second PE layer can be understood as a basic example of the positional relationship and connection relationship between the core material and the outer layer, and are not limited to only the first PE layer and the second PE layer. Based on the above concept, the second PE layer can be coated with several layers until the required PE profile size is reached.

[0009] By adopting the PE profile described in the present invention, the size of the PE profile can be increased by coating the second PE layer and welding it to the first PE layer, that is, the PE profile is not directly extruded to a specified size at one time, but the size is increased by coating the core material layer by layer, and the material properties of PE are utilized to enable the outer layer to be welded to the core material, so that the core material can dissipate heat and cool independently, and then the outer layer is coated to form the PE profile, which solves the problem of slow internal cooling and difficult stable molding of large-size PE profiles during direct extrusion processing. The PE profile is easy to manufacture, has a stable structure, is easy to control in size, has a high yield rate, and has good effects.

[0010] As a preferred technical solution of the present invention, the PE profile further includes a third PE layer, and the third PE layer is coated and welded to the surrounding side walls of the second PE layer.

[0011] In a second aspect, the present invention further provides a forming device for a PE profile as described in any one of the above items, comprising:

[0012] A first extruder, comprising a first die, wherein the first extruder extrudes the first PE layer through the first die;

[0013] A first cooler, used for cooling the first PE layer;

[0014] The second extruder includes a second die. The cooled first PE layer passes through the second die. The second extruder extrude the second PE layer through the second die. The second PE layer covers and is welded to the surrounding side walls of the first PE layer.

[0015] The PE profile molding equipment described in the present invention utilizes the existing extruder and only needs to adapt different extrusion dies. The different extrusion dies respectively mold the core material and the outer layer based on the core material. The outer layer can be automatically welded to the core material to form a whole by utilizing the material characteristics of PE. The core material is first cooled by a first cooler and then coated with the outer layer, which solves the problem of slow internal cooling and difficult stable molding of large-size PE profiles during direct extrusion processing. The PE profile molding equipment has a simple structure, is easy to operate, is cheap, has high production efficiency, and has good effects.

[0016] As a preferred technical solution of the present invention, the molding equipment of the PE profile also includes:

[0017] A second cooler, used for cooling the second PE layer;

[0018] The third extruder includes a third die. The cooled second PE layer passes through the third die. The third extruder extrude a third PE layer through the third die. The third PE layer covers and is welded to the surrounding side walls of the second PE layer.

[0019] As a further preferred technical solution of the present invention, the PE profile forming equipment also includes a third cooler, and the third cooler is used for cooling the third PE layer.

[0020] As a preferred technical solution of the present invention, the PE profile forming equipment also includes a cutting machine, and the cutting machine is used to cut the PE profile into sections.

[0021] As a further preferred technical solution of the present invention, the PE profile forming equipment also includes a material rack, which is arranged after the cutting machine and is used for receiving PE profile segments.

[0022] In a third aspect, the present invention also provides a method for forming a PE profile as described in any of the above items, wherein the first PE layer is extruded and cooled, the first PE layer is used as the core material for subsequent extrusion, the second PE layer is extruded based on the first PE layer, and the second PE layer is coated and welded to the four side walls of the first PE layer.

[0023] The molding method of a PE profile disclosed in the present invention utilizes an existing extruder and only needs to be adapted to different extrusion dies. The different extrusion dies respectively mold the core material and the outer covering layer based on the core material. The outer covering layer can be automatically welded to the core material to form a whole by utilizing the material characteristics of PE. The core material is first cooled and then coated with the outer covering layer, thereby solving the problem of slow internal cooling and difficulty in stable molding of large-size PE profiles during direct extrusion processing. The molding method of the PE profile is ingenious and unique, easy to implement, high in production efficiency, high in yield rate, almost no waste, and good in effect.

[0024] In a fourth aspect, the present invention further provides a PE pipe, using the PE profile as described in any one of the above items as PE pipe sheets, the PE pipe sheets can be spliced ​​in sequence to form a pipe body, and adjacent PE pipe sheets are hot-melt welded.

[0025] The PE pipe segment should be understood as being made of PE material and having a structural shape that is the shape of the pipe segment.

[0026] The PE pipe of the present invention adopts the aforementioned PE profile as the PE pipe sheet, thereby solving the problem of slow internal cooling and difficulty in stable molding of large-size PE profiles during direct extrusion processing. The production is convenient, the production efficiency is high, and the yield rate is high, making it feasible to efficiently manufacture large-diameter PE pipes.

[0027] As a preferred technical solution of the present invention, the outer wall of the PE pipe is provided with a fiber layer.

[0028] In a fifth aspect, the present invention further provides a PE pipe forming device as described in any one of the above items, comprising:

[0029] The core mold is used as the inner lining for PE pipe molding;

[0030] A lower mold, arranged below the core mold, used as an outer lining for forming the PE pipe;

[0031] An upper mold is arranged above the core mold and is used as an outer lining for forming the PE pipe. An annular cavity is formed between the upper mold, the lower mold and the core mold, and the cavity is used to accommodate the PE pipe sheet;

[0032] The upper mold includes two parts, the bracket connects the two parts of the upper mold, each part of the upper mold is connected to the lower mold, and a station is set between the two parts of the upper mold and at the cavity at the top position of the core mold;

[0033] A heater is provided at the work station, and is used for heating and melting corresponding surfaces between adjacent PE pipe sheets;

[0034] A limiter is arranged at the work station, and is used for limiting the position of the PE pipe sheet on the core mold and the butt-jointing position of the heating surface.

[0035] The PE pipe forming equipment described in the present invention is adopted, and an annular cavity is formed by combining the upper mold, the lower mold and the core mold, and the PE pipe segment is placed in the cavity. The bracket is used as the installation basis of the heater and the limiter, and as the opening and closing basis of the upper mold. The heater is used to heat and melt the corresponding surfaces of the adjacent PE pipe segments, and the position of the PE pipe segment is adjusted by the limiter. That is, the cooperation of the heater and the limiter can realize hot-melt welding of the PE pipe segment to form a PE pipe.

[0036] As a preferred technical solution of the present invention, the heater includes a heating plate and a first driver, the first driver is connected to the bracket, the movable end of the first driver is connected to the heating plate, and the first driver drives the heating plate to enter or leave the workstation.

[0037] After the heating plate enters the workstation, the corresponding surface of the PE tube sheet abuts against the heating plate and is heated and melted.

[0038] As a further preferred technical solution of the present invention, a plurality of grooves are evenly distributed along the periphery of the core mold, and the heating plate can extend into the grooves.

[0039] As a preferred technical solution of the present invention, the limiter includes a limit plate and a second driver, the second driver is connected to the bracket, the movable end of the second driver is connected to the limit plate, and the second driver drives the limit plate to enter or leave the workstation.

[0040] After the heating plate enters the workstation, the limit plate pushes the PE tube sheet to abut against the heating plate. After the heating plate leaves the workstation, the limit plate pushes the heating surface of the PE tube sheet to perform hot-melt welding.

[0041] As a preferred technical solution of the present invention, each part of the upper mold is provided with the limiter.

[0042] In a sixth aspect, the present invention further provides a PE pipe forming method, using the PE pipe forming device as described above, the forming method comprises:

[0043] The upper mold, the lower mold and the core mold are combined to form an annular cavity;

[0044] The PE pipe segment is arranged on the core mold, and the PE pipe segment is limited by the stopper;

[0045] The heater is used to heat and melt the corresponding surfaces between the adjacent PE tube sheets, and the stopper is used to push the PE tube sheet machine to perform hot-melt welding;

[0046] Hot-melt welding the PE pipe segments in sequence to form a PE pipe;

[0047] Lifting the support so that the upper mold is detached;

[0048] The core mold is pulled out, and the PE pipe is separated from the core mold.

[0049] A PE pipe forming method described in the present invention is adopted, and an annular cavity is formed by combining the upper mold, the lower mold and the core mold, and the PE pipe segment is placed in the cavity. The bracket is used as an installation basis for the heater and the limiter, and as an opening and closing basis for the upper mold. The heater is used to heat and melt the corresponding surfaces of the adjacent PE pipe segments, and the position of the PE pipe segment is adjusted by the limiter. That is, the cooperation of the heater and the limiter can realize hot-melt welding of the PE pipe segment to form a PE pipe.

[0050] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0051] 1. The PE profile described in the present invention can increase the size of the PE profile by coating the second PE layer and welding it to the first PE layer, that is, the PE profile is not directly extruded to a specified size at one time, but is increased in size by coating the core material layer by layer, and the outer layer can be welded to the core material by utilizing the characteristics of PE, so that the core material can dissipate heat and cool independently, and then the outer layer is coated to form the PE profile, which solves the problem of slow internal cooling and difficulty in stable molding of large-sized PE profiles during direct extrusion processing. The PE profile is easy to manufacture, has a stable structure, is easy to control in size, has a high yield rate, and has good effects;

[0052] 2. The PE profile molding equipment described in the present invention utilizes the existing extruder and only needs to be adapted to different extrusion dies. The different extrusion dies respectively mold the core material and the outer layer based on the core material. The outer layer can be automatically welded to the core material to form a whole by utilizing the material characteristics of PE. The core material is first cooled by the first cooling machine and then coated with the outer layer, which solves the problem of slow internal cooling and difficulty in stable molding of large-sized PE profiles during direct extrusion processing. The PE profile molding equipment has a simple structure, is easy to operate, is cheap, has high production efficiency, and has good effects.

[0053] 3. The molding method of a PE profile described in the present invention utilizes the existing extruder and only needs to be adapted to different extrusion dies. The different extrusion dies respectively mold the core material and the outer layer based on the core material. The outer layer can be automatically welded to the core material to form a whole by utilizing the material characteristics of PE. The core material is first cooled and then coated with the outer layer, which solves the problem of slow internal cooling and difficulty in stable molding of large-sized PE profiles during direct extrusion processing. The molding method of the PE profile is ingenious and unique, easy to implement, high in production efficiency, high in yield, almost no waste, and good in effect.

[0054] 4. The PE pipe of the present invention adopts the above-mentioned PE profile as the PE pipe sheet, thereby solving the problem of slow internal cooling and difficulty in stable forming of large-size PE profiles during direct extrusion processing. The production is convenient, the production efficiency is high, and the yield rate is high, making it feasible to efficiently manufacture large-diameter PE pipes;

[0055] 5. The molding equipment and method of a PE pipe described in the present invention form an annular cavity by combining the upper mold, the lower mold and the core mold, and the PE pipe segment is placed in the cavity. The bracket is used as the installation basis of the heater and the limiter, and as the opening and closing basis of the upper mold. The heater heats and melts the corresponding surfaces of the adjacent PE pipe segments, and the position of the PE pipe segment is adjusted by the limiter. That is, the cooperation of the heater and the limiter can realize hot-melt welding of the PE pipe segment to form a PE pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1 It is a structural schematic diagram of PE profile;

[0057] Figure 2 It is a schematic diagram of the molding equipment of PE profile;

[0058] Figure 3 It is a schematic diagram of the pipeline structure;

[0059] Figure 4 It is a schematic diagram of the structure of the fiber reinforced pipe;

[0060] Figure 5 A schematic diagram of a pipe forming device;

[0061] Figure 6 for Figure 5 Right view of .

[0062] Markings in the figure:

[0063] 1-PE pipe sheet, 11-first PE layer, 12-second PE layer, 13-third PE layer;

[0064] 21-first extruder, 211-first die, 22-second extruder, 221-second die, 23-third extruder, 231-third die, 24-first cooler, 25-second cooler, 26-third cooler, 27-cutting machine, 28-material rack;

[0065] 3-Fiber layer;

[0066] 41-core mold, 411-groove, 42-lower mold, 43-upper mold, 44-cavity, 45-support, 46-heating plate, 47-first driver, 481-pushing plate, 482-limiting plate, 491-second driver, 492-third driver. DETAILED DESCRIPTION

[0067] The present invention is further described in detail below in conjunction with test examples and specific implementation methods. However, this should not be understood as the scope of the above subject matter of the present invention being limited to the following embodiments, and all technologies realized based on the content of the present invention belong to the scope of the present invention.

[0068] Unless otherwise specified, in the description of the specific embodiments of the present invention, the terms indicating the orientation or position relationship such as "up", "down", "left", "right", "center", "inside", "outside", etc. are all expressions based on the orientation or position relationship shown in the drawings, or are the orientation or position relationship when the invented product / equipment / device is usually used. These terms of orientation or position relationship are only for the convenience of describing the scheme of the present invention or simplifying the description in the specific embodiments, so as to facilitate the technicians to quickly understand the scheme, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific position relationship, and therefore cannot be understood as a limitation on the present invention.

[0069] In addition, if the terms "horizontal", "vertical", "overhanging", "parallel" and the like appear, it does not mean that the corresponding devices / components / elements are required to be absolutely horizontal or vertical or overhanging or parallel, but may be slightly tilted or have deviations. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but may be slightly tilted. Alternatively, it can be simplified to mean that the corresponding devices / components / elements are set in directions such as "horizontal", "vertical", "overhanging", "parallel", etc., and can have an error / deviation of ±10% relative to the corresponding direction setting, more preferably an error / deviation within ±8%, more preferably an error / deviation within ±6%, more preferably an error / deviation within ±5%, and more preferably an error / deviation within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its role in the scheme of the present invention.

[0070] In addition, the expressions “first”, “second”, “third”, etc., which appear in the terms, are merely used to distinguish the description of the same or similar components and should not be understood as emphasizing or implying the relative importance of specific components.

[0071] In addition, in the description of the embodiments of the present invention, "several", "plurality" and "a number" represent at least 2. It can be any number such as 2, 3, 4, 5, 6, 7, 8, 9, and even more than 9.

[0072] In addition, in the description of the technical solution of the present invention, unless otherwise clearly specified / defined / restricted, the terms "set", "install", "connect", "connected", "provided with", "laid", and "arranged" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, and can be welding, riveting, bolting, threading, and other commonly used connection means in the field. This connection can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be the internal connection of two elements.

[0073] In the related art, large-diameter plastic pipes are produced by hot-melt welding of PE pipe segments, which requires larger pipe segments. PE pipe segments are formed by extrusion, but due to the processing characteristics of PE, the internal cooling of the profile is slow during extrusion, making it very difficult to process and form PE pipe segments. Figures 1 to 6 To elaborate.

[0074] Example 1

[0075] like Figure 1 As shown, the PE profile of the present invention comprises at least a first PE layer 11 and a second PE layer 12 , wherein the first PE layer 11 is in a strip-shaped structure, and the second PE layer 12 covers and is welded to the surrounding side walls of the first PE layer 11 .

[0076] Those skilled in the art can understand that, the first PE layer 11 is used as the core material of the second PE layer 12, and after the second PE layer 12 is coated and fused to the surrounding side walls of the first PE layer 11, it can be regarded as a new core material, and a new PE layer can continue to be coated on the outside. Therefore, the above-mentioned first PE layer 11 and the second PE layer 12 can be understood as a basic example of the positional relationship and connection relationship between the core material and the outer layer, and are not limited to only the first PE layer 11 and the second PE layer 12. Based on the above concept, the second PE layer 12 can also be coated with several layers to reach the required PE profile size.

[0077] The specific shapes and sizes of the first PE layer 11 and the second PE layer 12 can be constrained and formed by a mold to facilitate precise processing and forming.

[0078] In an optional embodiment, the PE profile further includes a third PE layer 13 , and the third PE layer 13 is coated on and welded to the surrounding side walls of the second PE layer 12 .

[0079] A PE profile described in this embodiment can increase the size of the PE profile by coating the second PE layer 12 and welding it to the first PE layer 11, that is, the PE profile is not directly extruded to a specified size at one time, but the size is increased by coating the core material layer by layer, and the material properties of PE are utilized to enable the outer layer to be welded to the core material, so that the core material can dissipate heat and cool independently, and then the outer layer is coated to form a PE profile, which solves the problem of slow internal cooling and difficult stable molding of large-sized PE profiles during direct extrusion processing. The PE profile is easy to manufacture, has a stable structure, is easy to control in size, has a high yield rate, and has good effects.

[0080] Example 2

[0081] like Figure 1and Figure 2 As shown, a forming device for a PE profile as described in Example 1 of the present invention comprises a first extruder 21, a first cooler 24, a second extruder 22, a second cooler 25, a third extruder 23, a third cooler 26, a cutting machine 27 and a material rack 28 which are arranged in sequence.

[0082] The first extruder 21 includes a first die 211, and the first extruder 21 extrude and mold the first PE layer 11 through the first die 211; the first cooler 24 is used for cooling the first PE layer 11; the second extruder 22 includes a second die 221, and the first PE layer 11 after cooling to a certain temperature penetrates into the second die 221, and the second extruder 22 extrude the second PE layer 12 through the second die 221, and the second PE layer 12 is coated and fused to the surrounding side walls of the first PE layer 11; the second cooler 25 is used for cooling the second PE layer 12; the third extruder 23 includes a third die 231, and the second PE layer 12 after cooling to a certain temperature penetrates into the third die 231, and the third extruder 23 extrude the third PE layer 13 through the third die 231, and the third PE layer 13 is coated and fused to the surrounding side walls of the second PE layer 12; the third cooler 26 is used for cooling the third PE layer 13; the cutting machine 27 is used for cutting PE profiles into segments; the material rack 28 is used for connecting PE profile segments.

[0083] The PE profile molding equipment described in this embodiment utilizes the existing extruder and only needs to be adapted to different extrusion dies. The different extrusion dies respectively mold the core material and the outer layer based on the core material. The outer layer can be automatically welded to the core material to form a whole by utilizing the material characteristics of PE. The core material is first cooled by the first cooler 24 and then coated with the outer layer, which solves the problem of slow internal cooling and difficult stable molding of large-sized PE profiles during direct extrusion processing. The PE profile molding equipment has a simple structure, is easy to operate, is cheap, has high production efficiency, and has good effects.

[0084] Example 3

[0085] like Figure 1 and Figure 2 As shown, the present invention describes a method for forming a PE profile as described in Example 1, wherein the first PE layer 11 is extruded and cooled, the first PE layer 11 is used as the core material for subsequent extrusion, and the second PE layer 12 is extruded based on the first PE layer 11, and the second PE layer 12 is coated and welded to the four side walls of the first PE layer 11.

[0086] In an optional embodiment, the PE profile forming method is implemented using the PE profile forming equipment as described in Example 2.

[0087] The molding method of a PE profile described in this embodiment utilizes the existing extruder and only needs to be adapted to different extrusion dies. The different extrusion dies respectively mold the core material and the outer layer based on the core material. The outer layer can be automatically welded to the core material to form a whole by utilizing the material characteristics of PE. The core material is first cooled and then coated with the outer layer, which solves the problem of slow internal cooling and difficult stable molding of large-sized PE profiles during direct extrusion processing. The molding method of the PE profile is ingenious and unique, easy to implement, high in production efficiency, high in yield, almost no waste, and good in effect.

[0088] Example 4

[0089] like Figure 3 As shown, a PE pipe described in the present invention utilizes the PE profile described in Example 1 as a PE pipe sheet 1. The PE pipe sheets 1 can be spliced ​​in sequence to form a pipe body, and adjacent PE pipe sheets 1 are hot-melt welded.

[0090] The PE pipe segment 1 should be understood as being made of PE material and having a pipe segment shape.

[0091] In an optional embodiment, if Figure 4 As shown, the outer wall of the PE pipe is provided with a fiber layer 3, and the fiber layer 3 includes one or more of glass fiber, rock fiber, and carbon fiber, and is coated on the outer wall of the PE pipe by impregnation resin.

[0092] The PE pipe described in this embodiment adopts the aforementioned PE profile as the PE pipe sheet 1, thereby solving the problem of slow internal cooling and difficulty in stable molding of large-size PE profiles during direct extrusion processing. The production is convenient, the production efficiency is high, and the yield rate is high, making it feasible to efficiently manufacture large-diameter PE pipes.

[0093] Example 5

[0094] like Figure 5 and Figure 6 As shown, a PE pipe forming device as described in Example 4 of the present invention includes a core mold 41, a lower mold 42, an upper mold 43, a bracket 45, a heater and a limiter.

[0095] The core mold 41 is used as the inner lining for forming a PE pipe; the lower mold 42 is arranged below the core mold 41 and is used as the outer lining for forming a PE pipe; the upper mold 43 is arranged above the core mold 41 and is used as the outer lining for forming a PE pipe, and an annular cavity 44 is formed between the upper mold 43, the lower mold 42 and the core mold 41, and the cavity 44 is used to accommodate the PE pipe segment 1.

[0096] The upper mold 43 includes two parts, the bracket 45 connects the two parts of the upper mold 43, each part of the upper mold 43 is connected to the lower mold 42, and a work station is set between the two parts of the upper mold 43 and at the cavity 44 at the top position of the core mold 41.

[0097] The heater is arranged at the work station, and the heater is used for heating and melting the corresponding surfaces between adjacent PE pipe sheets 1; the limiter is arranged at the work station, and the limiter is used for limiting the position of the PE pipe sheet 1 on the core mold 41, and limiting the docking of the heating surface.

[0098] In an optional embodiment, the heater includes a heating plate 46 and a first driver 47, the first driver 47 is connected to the bracket 45, the movable end of the first driver 47 is connected to the heating plate 46, and the first driver 47 drives the heating plate 46 to enter or leave the workstation.

[0099] After the heating plate 46 enters the work station, the corresponding surface of the PE tube sheet 1 abuts against the heating plate 46 and is heated and melted.

[0100] In an optional embodiment, a plurality of grooves 411 are evenly distributed along the periphery of the core mold 41 , and the heating plate 46 can extend into the grooves 411 .

[0101] In an optional embodiment, the limiter includes a push plate 481, a limit plate 482, a second driver 491 and a third driver 492, the second driver 491 and the third driver 492 are both connected to the bracket 45, the movable end of the second driver 491 is connected to the push plate 481, the movable end of the third driver 492 is connected to the limit plate 482, the second driver 491 drives the push plate 481 to enter or leave the work station, and the third driver 492 drives the limit plate 482 to enter or leave the work station.

[0102] After the heating plate 46 enters the workstation, the push plate 481 pushes the new PE tube sheet 1 against the heating plate 46, and the limit plate 482 presses the PE tube sheet 1 against the heating plate 46. The limit plate 482 also needs to press the weld seam adjacent to the heating plate 46 to prevent its displacement (such as Figure 5 As shown), after the heating plate 46 leaves the work station, the pushing plate 481 pushes the heating surface of the PE tube sheet 1 to be hot-melt welded to the heating surface of the PE tube sheet 1 pressed by the limiting plate 482.

[0103] The PE pipe forming equipment described in this embodiment forms an annular cavity 44 by combining the upper mold 43, the lower mold 42 and the core mold 41, and the PE pipe segment 1 is placed in the cavity 44. The bracket 45 is used as the installation basis of the heater and the limiter, and as the opening and closing basis of the upper mold 43. The heater heats and melts the corresponding surfaces of the adjacent PE pipe segments 1, and the position of the PE pipe segment 1 is adjusted by the limiter. That is, the cooperation of the heater and the limiter can realize hot-melt welding of the PE pipe segment 1 to form a PE pipe.

[0104] Example 6

[0105] like Figure 5 and Figure 6 As shown, a PE pipe forming method according to the present invention utilizes the PE pipe forming device according to Example 5, and the forming method comprises:

[0106] The upper mold 43, the lower mold 42 and the core mold 41 are molded together to form an annular cavity 44;

[0107] The PE pipe sheet 1 is arranged on the core mold 41, and the PE pipe sheet 1 is limited by the limiter;

[0108] The corresponding surfaces between the adjacent PE tube sheets 1 are heated and melted by the heater, and the PE tube sheets 1 are pushed by the stopper to perform hot-melt welding;

[0109] Hot-melt welding the PE pipe segments 1 in sequence to form a PE pipe;

[0110] Lifting the bracket 45 away from the upper mold 43;

[0111] The core mold 41 is pulled out, and the PE pipe is separated from the core mold 41 .

[0112] The present embodiment describes a method for forming a PE pipe, wherein an annular cavity 44 is formed by combining the upper mold 43, the lower mold 42 and the core mold 41, and the PE pipe segment 1 is placed in the cavity 44. The bracket 45 is used as a mounting base for the heater and the limiter, and as a base for opening and closing the upper mold 43. The heater is used to heat and melt the corresponding surfaces of the adjacent PE pipe segments 1, and the position of the PE pipe segment 1 is adjusted by the limiter, that is, the cooperation of the heater and the limiter can realize hot-melt welding of the PE pipe segment 1 to form a PE pipe.

[0113] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A PE profile, characterized in that: It comprises at least a first PE layer (11) and a second PE layer (12); the first PE layer (11) is in a strip-shaped structure; the second PE layer (12) covers and is welded to the surrounding side walls of the first PE layer (11).

2. The PE profile according to claim 1, characterized in that: It also includes a third PE layer (13), wherein the third PE layer (13) covers and is welded to the surrounding side walls of the second PE layer (12).

3. A PE profile forming device as claimed in any one of claims 1 to 2, characterized in that: include: A first extruder (21) comprising a first die (211), wherein the first extruder (21) extrudes the first PE layer (11) through the first die (211); A first cooler (24) for cooling the first PE layer (11); The second extruder (22) includes a second die (221). The cooled first PE layer (11) passes through the second die (221). The second extruder (22) extrude the second PE layer (12) through the second die (221). The second PE layer (12) covers and is fused to the surrounding side walls of the first PE layer (11).

4. The PE profile forming equipment according to claim 3, characterized in that: Also includes: A second cooler (25) for cooling the second PE layer (12); The third extruder (23) includes a third die (231). The cooled second PE layer (12) passes through the third die (231). The third extruder (23) extrude a third PE layer (13) through the third die (231). The third PE layer (13) is coated and fused to the surrounding side walls of the second PE layer (12).

5. The PE profile forming equipment according to any one of claims 3 to 4, characterized in that: It also comprises a cutting machine (27), wherein the cutting machine (27) is used to cut the PE profile into sections.

6. A method for forming a PE profile as claimed in any one of claims 1 to 2, characterized in that: The first PE layer (11) is extruded and cooled, the first PE layer (11) is used as the core material for the subsequent extrusion, the second PE layer (12) is extruded based on the first PE layer (11), and the second PE layer (12) is coated and welded to the four side walls of the first PE layer (11).

7. A PE pipe, characterized in that: The PE profile as claimed in any one of claims 1 to 2 is used as a PE pipe sheet (1), the PE pipe sheets (1) can be spliced ​​in sequence to form a pipe body, and adjacent PE pipe sheets (1) are hot-melt welded.

8. The PE pipe according to claim 7, characterized in that: The outer wall of the PE tube sheet (1) is provided with a fiber layer (3).

9. A PE pipe forming device as claimed in any one of claims 7 to 8, characterized in that: include: A core mold (41) is used as an inner lining for forming a PE pipe; A lower mold (42) is disposed below the core mold (41) and is used as an outer lining for forming a PE pipe; An upper mold (43) is arranged above the core mold (41) and is used as an outer lining for forming the PE pipe. An annular cavity (44) is formed between the upper mold (43), the lower mold (42) and the core mold (41), and the cavity (44) is used to accommodate the PE pipe sheet (1); A support (45), wherein the upper mold (43) comprises two parts, the support (45) connects the two parts of the upper mold (43), each part of the upper mold (43) is butt-jointed with the lower mold (42), and a work station is arranged between the two parts of the upper mold (43) and at the mold cavity (44) at the top position of the core mold (41); A heater is arranged at the work station, and is used for heating and melting corresponding surfaces between adjacent PE pipe sheets (1); A limiter is arranged at the work station, and is used for limiting the position of the PE pipe sheet (1) on the core mold (41) and for limiting the butt joint of the heating surface.

10. A method for forming a PE pipe, characterized in that: Using the PE pipe forming device as claimed in claim 9, the forming method comprises: The upper mold (43), the lower mold (42) and the core mold (41) are combined to form an annular cavity (44); The PE pipe sheet (1) is arranged on the core mold (41), and the PE pipe sheet (1) is limited by the limiter; The corresponding surfaces between adjacent PE tube sheets (1) are heated and melted by the heater, and the PE tube sheets (1) are pushed by the stopper to perform hot-melt welding; Hot-melt welding the PE pipe segments (1) in sequence to form a PE pipe; Lifting the support (45) away from the upper mold (43); The core mold (41) is pulled out, and the PE pipe is separated from the core mold (41).

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