CN219789214U

CN219789214U - Pipe extrusion die

Info

Publication number: CN219789214U
Application number: CN202320880252.2U
Authority: CN
Inventors: 王勇彪; 吕爱龙; 陆伟华; 钟培勇
Original assignee: Foshan Rifeng Enterprise Co Ltd; Rifeng Enterprise Group Co Ltd; Rifeng Technology Co Ltd
Current assignee: Foshan Rifeng Enterprise Co Ltd; Rifeng Enterprise Group Co Ltd; Rifeng Technology Co Ltd
Priority date: 2023-04-18
Filing date: 2023-04-18
Publication date: 2023-10-03
Anticipated expiration: 2033-04-18

Abstract

The embodiment of the utility model provides a pipe extrusion die, which comprises a die monomer, wherein a pipe via hole is arranged in the die monomer, the pipe via hole comprises a transition section and a stable section which are sequentially arranged along the moving direction of a pipe, and the inner diameter of the transition section is gradually reduced to be matched with the diameter of the stable section along the moving direction of the pipe; the die monomer comprises a core die and a mouth die, a conical annular surface runner is arranged between the core die and the mouth die, the conical annular surface runner and the pipe through hole are coaxially arranged, one end with a larger diameter of the conical annular surface runner is a feeding end, one end with a smaller diameter is a discharging end, and the feeding end is connected with a feeding channel. According to the pipe extrusion die, the pipe through hole is formed in the middle of the die monomer, during pipe processing, materials are extruded to the surface of the pipe passing through the pipe through hole through the conical annular surface runner, and as adjacent layers of the pipe respectively pass through different extrusion channels, the extrusion of functional layers with different colors and different materials is facilitated, and the functional layers cannot interfere with each other.

Description

Pipe extrusion die

Technical Field

The utility model relates to the field of pipe processing equipment, in particular to a pipe extrusion die.

Background

The plastic pipe formed by extruding and coating more than two layers of different materials once or repeatedly is called a multi-layer composite pipe, and the pipe has multiple performances and can meet the requirements under special working environments.

For example, to meet the needs of special working environments, five-layer tubes including a base tube (which can be any plastic tube on the market) -a glue layer-evoh (oxygen barrier layer) -a glue layer-PE layer can be selected, and conventional extruded tubes are all shared flow channels in the process of normally extruding the multi-layer tubes, because thicker and uneven layers of materials often occur due to different properties of each layer, the phenomenon of mutual interference of color mixing interception conduction occurs, and the phenomenon of glue shortage of some coatings occurs.

Meanwhile, the existing extrusion die generally needs operators to adjust the concentricity of the wall thickness of the pipe plastic layer by layer gradually, which often takes a long time and generates more machine-adjusting waste materials, thus wasting labor, time and raw materials; in addition, the wall thickness of the common runner can only be adjusted by the coextrusion die in the prior art, the wall thickness can not be adjusted for each layer independently, and the flexibility is poor.

Disclosure of Invention

The utility model aims to provide a pipe extrusion die which can overcome the problems of mutual interference and color mixing of a common flow channel caused by the property difference of each layer of material.

Embodiments of the utility model may be implemented as follows:

in a first aspect, the utility model provides a pipe extrusion die, comprising a die monomer, wherein a pipe via hole is arranged in the die monomer, the pipe via hole comprises a transition section and a stable section which are sequentially arranged along the moving direction of a pipe, and the inner diameter of the transition section is gradually reduced to be matched with the diameter of the stable section along the moving direction of the pipe;

the die monomer comprises a core die and a mouth die, wherein a conical annular surface runner for extruding materials to the surface of a pipe material in a pipe material through hole is arranged between the core die and the mouth die, the conical annular surface runner and the pipe material through hole are coaxially arranged, one end with a larger diameter of the conical annular surface runner is a feeding end, one end with a smaller diameter is a discharging end, and the feeding end is connected with a feeding channel.

In an alternative embodiment, the conical annular surface runner feeding end is concavely provided with a pressure-building annular runner, and the pressure-building annular runner and the conical annular surface runner are coaxially arranged.

In an alternative embodiment, the pressure-building annular runner is arranged on the core mold, the radial section of the pressure-building annular runner is semicircular, and the radius of the pressure-building annular runner is 2-3 times of the width of the conical annular runner at the position. In an alternative embodiment, the discharging direction of the conical annular surface runner is parallel to the axis of the conical annular surface runner, and the diameter of the pipe section of the pipe through hole is matched with the inner diameter of the discharging end of the conical annular surface runner.

In an alternative embodiment, the mandrel is provided with an inner annular positioning surface, the die is provided with an outer annular positioning surface, and the inner annular positioning surface and the outer annular positioning surface are mutually attached and are coaxially arranged with the conical annular surface runner.

In an alternative embodiment, the discharge port of the feed channel is located in the conical annular surface flow channel, and more than two discharge ports are circumferentially arranged along the conical annular surface flow channel.

In an alternative embodiment, the feeding channel comprises a main channel, the main channel and the discharging port are communicated through a branch channel, and the feeding port of the main channel is arranged on the peripheral surface of the die monomer.

In an alternative embodiment, the die comprises a first mounting ring arranged outside the conical ring-shaped surface runner, the core mold comprises a second mounting ring matched with the first mounting ring in position and shape, and the first mounting ring and the second mounting ring are detachably connected through screws and/or pins.

In an alternative embodiment, a separating groove is provided on the end face of the first and/or second mounting ring, and the notch of the separating groove is located on the peripheral face of the first and/or second mounting ring.

In an alternative embodiment, the mold units have more than two, and the more than two mold units are coaxially arranged; and a limiting groove is formed in one end face of the die monomer, and a limiting boss matched with the limiting groove in shape and size is arranged on the other end face of the die monomer.

The beneficial effects of the embodiment of the utility model include, for example:

according to the pipe extrusion die, the pipe through hole is formed in the middle of the die monomer, during pipe processing, materials are extruded to the surface of the pipe passing through the pipe through hole through the conical annular surface runner, and as adjacent layers of the pipe respectively pass through different extrusion channels, the extrusion of functional layers with different colors and different materials is facilitated, and the functional layers cannot interfere with each other.

The pipe through hole comprises the transition section and the stabilizing section, the transition section can realize the guiding function on the passing pipe, the stabilizing section is matched with the outer diameter of the pipe passing through the transition section, the stabilizing function on the pipe is realized, and the material in the conical annular surface flow channel is uniformly extruded to the outer surface of the pipe.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is an exploded view of a die monomer according to the present utility model;

FIG. 2 is a schematic diagram of a mandrel according to the present utility model;

FIG. 3 is a schematic view of the structure of the die according to the present utility model;

FIG. 4 is a cross-sectional view of a mold unit in the present utility model;

fig. 5 is an enlarged view of a portion a of fig. 4;

FIG. 6 is a cross-sectional view of one embodiment of the present utility model for creating a annular flow passage;

fig. 7 is an exploded view of a mold formed by coaxially arranging four mold units in the present utility model.

Icon: 100-mold monomers; 110-pipe via holes; 111-a stabilizing section; 112-transition section; 120-mandrel; 121-a second mounting ring; 122-an inner annular locating surface; 130-die; 131-a first mounting ring; 132-an outer annular locating surface; 140-conical annular surface flow channel; 150-feeding channels; 151-main channel; 152-bypass channel; 160-building a ring-shaped runner; 170-limit grooves; 180-limiting bosses; 191-a screw; 192-pins; 193-separator tank.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the present utility model, it should be noted that, if the terms "upper", "lower", "inner", "outer", and the like indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, or the azimuth or the positional relationship in which the inventive product is conventionally put in use, it is merely for convenience of describing the present utility model and simplifying the description, and it is not indicated or implied that the apparatus or element referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus it should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, if any, are used merely for distinguishing between descriptions and not for indicating or implying a relative importance.

It should be noted that the features of the embodiments of the present utility model may be combined with each other without conflict.

Referring to fig. 1 to 5, the present embodiment provides a pipe extrusion die, including a die unit 100, wherein a pipe via hole 110 is provided in the die unit 100, the pipe via hole 110 includes a transition section 112 and a stabilizing section 111 sequentially provided along a moving direction of a pipe, and an inner diameter of the transition section 112 gradually decreases to be matched with a diameter of the stabilizing section 111 along the moving direction of the pipe;

the die unit 100 comprises a core die 120 and a mouth die 130, a conical annular surface runner 140 for extruding materials to the surface of the inner pipe of the pipe through hole 110 is arranged between the core die 120 and the mouth die 130, the conical annular surface runner 140 and the pipe through hole 110 are coaxially arranged, one end with a larger diameter of the conical annular surface runner 140 is a feeding end, one end with a smaller diameter is a discharging end, and the feeding end is connected with a feeding channel 150.

Preferably, the mold in this embodiment may include a single mold 100 for extruding a single layer of pipe, or may include a single mold 100, so that the pipe obtained in other manners passes through the pipe via 110, and the material extruded by the conical annular surface runner 140 may be coated on the surface of the pipe leaving the pipe via 110, thereby realizing the preparation of two or more layers of pipe; in addition, the mold in this embodiment may also include a plurality of mold units 100, each mold unit 100 may be used for producing a layer of pipe, and the preparation of a multilayer pipe may be achieved by a plurality of molds.

According to the pipe extrusion die, the pipe through hole 110 is formed in the middle of the die monomer 100, materials are extruded to the surface of the pipe passing through the pipe through hole 110 through the conical annular surface runner 140 during pipe processing, and as adjacent layers of the pipe respectively pass through different extrusion channels, the extrusion of functional layers with different colors and different materials is facilitated, and the problem of mutual interference between the different functional layers is avoided.

The pipe via hole 110 comprises the transition section 112 and the stabilizing section 111, the transition section 112 can realize the guiding function on the passing pipe, the stabilizing section 111 is matched with the outer diameter of the pipe passing through the transition section, the stabilizing function on the pipe is realized, and the material in the conical annular surface runner 140 can be uniformly extruded to the outer surface of the pipe. In addition, generally, when a plurality of mold units 100 are matched for use, the outer diameter of the outlet of the conical annular surface runner 140 of the front mold unit 100 needs to be matched with the inner diameter of the outlet of the conical annular surface runner 140 of the rear mold unit 100, so that the sizes of the mold units in each set of molds need to be adaptively adjusted, the production complexity of the molds is improved, and the universality of the molds is also not improved. In the utility model, the die unit 100 is provided with the transition section 112 and the stabilizing section 111, the transition section 112 can slightly shrink the pipe diameter of the inner pipe while playing a role in guiding, and the existence of the stabilizing section 111 can also enable the shrink state of the inner pipe to be relatively stable, so that the connection between the pipe layer extruded by the conical annular surface runner 140 and the inner pipe passing through the pipe through hole 110 is convenient.

In this embodiment, the material gradually moves from the large end to the small end in the conical annular surface flow channel 140, so that along with the movement of the material, the pressure received by the material gradually increases, which is beneficial to improving the uniformity of the distribution of the material in the conical annular surface flow channel 140, and thus is beneficial to obtaining the uniform distribution of the material in the same layer in the pipe.

In some alternative embodiments, the feeding end of the conical annular surface runner 140 is concavely provided with a pressure-build annular runner 160, and the pressure-build annular runner 160 is coaxially disposed with the conical annular surface runner 140.

In this embodiment, the material enters the conical annular surface runner 140 from the feeding channel 150, and considering the factors such as the strength and the processing difficulty of the die, the feeding channel 150 cannot be provided too much, the feeding channel 150 can only disperse the material at several points of the feeding end of the conical annular surface runner 140, in order to uniformly distribute the material entering the conical annular surface runner 140, the pressure-build annular runner 160 is provided, the uniformity of the distribution of the material between the feeding channel 150 and the pressure-build annular runner 160 is improved, and further the uniform distribution of the material in the same layer in the pipe is facilitated.

In some preferred embodiments, the annular flow channel 160 is disposed on the mandrel 120, and the radial cross section of the annular flow channel 160 is semicircular and has a radius 2-3 times the width of the conical annular flow channel 140. In this embodiment, the cross section of the annular flow channel 160 is semicircular, and compared with other shapes, such as the shape of fig. 6, firstly the processing difficulty is greatly reduced, and secondly the uniformity of the wall thickness of each layer in the multilayer pipe is better.

In some alternative embodiments, the discharging direction of the conical annular surface runner 140 is parallel to the axis of the conical annular surface runner 140, and the diameter of the outlet pipe section of the pipe via 110 is adapted to the inner diameter of the discharging end of the conical annular surface runner 140.

The discharging direction of the conical annular surface runner 140 is parallel to the axis of the conical annular surface runner 140, so that the inner layer pipe passing through the pipe through hole 110 and not yet completely shaped can be prevented from being subjected to larger pressure, the deformation risk of the inner layer pipe is reduced, meanwhile, in order to enable the inner layer pipe to be tightly combined with the discharging of the conical annular surface runner 140 as much as possible, the ideal state is that the diameter of the pipe outlet section of the pipe through hole 110 is the same as the inner diameter of the discharging end of the conical annular surface runner 140, so that in the actual processing process, the thickness between the pipe outlet section of the pipe through hole 110 in the core mold 120 and the discharging end of the conical annular surface runner 140 is required to be smaller as much as possible under the condition that the normal operation of the mold can be ensured, and a specific size can be adjusted according to the thickness of the pipe extruded by the conical annular surface runner 140: for example, when the thickness of the pipe extruded from the tapered annular flow channel 140 is larger, the mandrel 120 between the pipe outlet section of the pipe via 110 and the discharge end of the tapered annular flow channel 140 is relatively more stressed, and the wall thickness may be slightly larger.

In some alternative embodiments, the core mold 120 is provided with an inner annular positioning surface 122, the die 130 is provided with an outer annular positioning surface 132, and the inner annular positioning surface 122 and the outer annular positioning surface 132 are mutually attached and are coaxially arranged with the conical annular surface runner 140.

In this embodiment, the inner annular locating surface 122 and the outer annular locating surface 132 are matched with each other, so that the dislocation of the core mold 120 and the neck mold 130 can be avoided, and therefore, the concentricity adjustment is not required to be manually performed, the thickness of the conical annular surface runner 140 is not required to be checked, the machining efficiency can be improved, the concentricity of the multilayer pipe can be improved, and further the quality of the pipe can be improved.

In some alternative embodiments, the discharge ports of the feeding channel 150 are located in the conical annular surface flow channel 140, and more than two discharge ports are circumferentially arranged along the conical annular surface flow channel 140, and in general, the plurality of discharge ports are relatively uniformly distributed at the feeding end of the conical annular surface flow channel 140, so that the uniform distribution of the materials in the conical annular surface flow channel 140 is facilitated.

In some alternative embodiments, the feeding channel 150 includes a main channel 151, the main channel 151 and the discharge port are communicated through a branch channel 152, and the feeding port of the main channel 151 is disposed on the peripheral surface of the die unit 100.

In some preferred embodiments, the bypass channels 152 are arranged in pairs symmetrically on either side of the flow path of the conical annulus such that the material flow rate in each bypass channel 152 is the same or similar. In some embodiments, the main channel 151 and the branch channel 152 are disposed on the contact surface of the core mold 120 and the die 130, that is, grooves are disposed on the contact surface of the core mold 120 and the die 130, and the shapes, sizes and positions of the grooves are adapted, so that when the core mold 120 and the die 130 are installed, the complete main channel 151 and the branch channel 152 are formed; for other cases, the main channel 151 and the bypass channel 152 may be provided separately on the die 130, separately on the mandrel 120, or shuttled over the die 130 and the mandrel 120.

In some alternative embodiments, the die 130 includes a first mounting ring 131 disposed outside the conical ring-shaped surface runner 140, the mandrel 120 includes a second mounting ring 121 that is positioned and shaped to match the first mounting ring 131, and the first mounting ring 131 and the second mounting ring 121 are detachably connected by screws 191 and/or pins 192. The first mounting ring 131 and the second mounting ring 121 are detachably connected through the screw 191 or the pin 192, so that the die 130 and the core die 120 can be conveniently installed and fixed, and particularly, mounting holes are formed in the first mounting ring 131 and the second mounting ring 121, the screw 191 or the pin 192 sequentially penetrates through the mounting holes in the first mounting ring 131 and the second mounting ring 121, the number of the mounting holes in the first mounting ring 131 can be selected according to a metallographic mode as required, and the mounting holes are preferably uniformly distributed on the first mounting ring 131 and the second mounting ring 121.

In some alternative embodiments, a separation groove 193 is provided on an end surface of the first mounting ring 131 and/or the second mounting ring 121, and a notch of the separation groove 193 is located on a circumferential surface of the first mounting ring 131 and/or the second mounting ring 121, so as to facilitate separation of the core mold 120 and the die 130 and separation between adjacent mold units 100.

In some alternative embodiments, the mold units 100 have more than two, and more than two of the mold units 100 are coaxially disposed; the die unit 100 is provided with a limit groove 170 on one end surface, and a limit boss 180 with a shape and a size matching those of the limit groove 170 on the other end surface, as shown in fig. 1 to 7.

When more than two die units 100 are assembled, the limiting boss 180 of each die unit 100 extends into the limiting groove 170 of the adjacent die unit 100, preferably, the limiting groove 170 and the limiting boss 180 are both circular and coaxially arranged with the conical annular surface runner 140, on one hand, the assembly of more than two die units 100 can be facilitated, on the other hand, the feeding ports of the main channels 151 corresponding to the adjacent two die units 100 can be staggered in the circumferential direction, and the layout of other matching devices such as storage tanks is facilitated.

The foregoing is merely illustrative of the present utility model, and the present utility model is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present utility model should be included in the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claims.

Claims

1. The pipe extrusion die is characterized by comprising a die monomer, wherein a pipe through hole is arranged in the die monomer, the pipe through hole comprises a transition section and a stable section which are sequentially arranged along the moving direction of a pipe, and the inner diameter of the transition section is gradually reduced to be matched with the diameter of the stable section along the moving direction of the pipe;

2. The pipe extrusion die of claim 1, wherein the conical annular surface runner feed end is concavely provided with a build annular runner coaxially disposed with the conical annular surface runner.

3. The pipe extrusion die of claim 2, wherein the pressure-build annular runner is disposed on a mandrel, the radial cross section of the pressure-build annular runner is semicircular, and the radius is 2-3 times the width of the conical annular runner.

4. The pipe extrusion die of claim 1, wherein the discharge direction of the conical annular surface runner is parallel to the axis of the conical annular surface runner, and the diameter of the pipe section of the pipe via hole is adapted to the inner diameter of the discharge end of the conical annular surface runner.

5. The pipe extrusion die of claim 1, wherein the mandrel is provided with an inner annular locating surface, the die is provided with an outer annular locating surface, and the inner annular locating surface and the outer annular locating surface are mutually attached and are coaxially arranged with the conical annular surface runner.

6. The pipe extrusion die of claim 1, wherein the discharge port of the feed channel is located in a conical annular surface flow channel, and more than two discharge ports are circumferentially arranged along the conical annular surface flow channel.

7. A pipe extrusion die according to claim 3, wherein the feed channel comprises a main channel, the main channel and the discharge port are communicated through a branch channel, and the feed port of the main channel is arranged on the peripheral surface of the die monomer.

8. The pipe extrusion die of claim 1, wherein the die comprises a first mounting ring disposed outside the conical ring face flow channel, the mandrel comprises a second mounting ring positioned and shaped to fit the first mounting ring, and the first and second mounting rings are detachably connected by screws and/or pins.

9. The pipe extrusion die of claim 8, wherein a separation groove is provided on an end face of the first and/or second mounting ring, and a notch of the separation groove is located on a peripheral face of the first and/or second mounting ring.

10. The pipe extrusion die of claim 1, wherein more than two die units are provided, and more than two die units are coaxially arranged; and a limiting groove is formed in one end face of the die monomer, and a limiting boss matched with the limiting groove in shape and size is arranged on the other end face of the die monomer.