Pipe extrusion die and pipe forming apparatus

Abstract

The application discloses a pipe extrusion die and a pipe forming device, which comprise an outer die sleeve assembly, a spiral body, a main flow channel and a spiral groove arranged on the spiral body, a first branch flow channel formed between the spiral groove and the outer die sleeve assembly, an inlet end of the first branch flow channel communicated with the main flow channel, a die core assembly arranged in the outer die sleeve assembly and connected with the spiral body, a forming channel arranged between the die core assembly and the outer die sleeve assembly, wherein the spiral body is further provided with a second branch flow channel, an inlet end of the second branch flow channel communicated with the main flow channel, and outlet ends of the first branch flow channel and the second branch flow channel both communicated with the forming channel. Plastic fluid flows to the first branch flow channel and the second branch flow channel through the main flow channel, and then converges to the forming channel, so that pipe forming is completed, which is beneficial to eliminating welding marks and can produce high-yield and high-quality pipe products at a relatively low extrusion pressure.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pipe forming technology, in particular to a pipe extrusion die and a pipe forming device. BACKGROUND

[0002] In the prior art, the design of a common 250PE pipe extrusion die generally adopts a single-layer spiral structure. In order to balance the yield and the extrusion pressure and the product and the cost, the spiral groove of the extrusion die is designed to be relatively thick and deep, so that a relatively high yield can be obtained under a relatively low extrusion pressure. The structure of the above design has the following problems: under a relatively low pressure, the inner wall of the pipe shows obvious fusion line, which causes the appearance defect of the pipe product and affects the market promotion of the pipe product. SUMMARY

[0003] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides a pipe extrusion die which is beneficial to eliminate the fusion mark and improve the product quality.

[0004] The present application also provides a pipe forming device using the above pipe extrusion die.

[0005] The pipe extrusion die according to the first aspect of the present application comprises: an outer die sleeve assembly; a spiral body arranged in the outer die sleeve assembly, the spiral body being provided with a main flow channel for feeding plastic fluid and a spiral groove located on the outer wall of the spiral body, a first branch flow channel being formed between the spiral groove and the outer die sleeve assembly, the inlet end of the first branch flow channel being in communication with the main flow channel; a die core assembly arranged in the outer die sleeve assembly and connected with the spiral body, a forming channel being arranged between the die core assembly and the outer die sleeve assembly; wherein the spiral body is further provided with a second branch flow channel, the inlet end of the second branch flow channel being in communication with the main flow channel, and the outlet end of the first branch flow channel and the outlet end of the second branch flow channel are both in communication with the forming channel.

[0006] The pipe extrusion die according to the present application has at least the following beneficial effects: by using the above structure, the plastic fluid flows to the first branch flow channel and the second branch flow channel through the main flow channel, and then converges to the forming channel, thereby completing the pipe forming. Compared with the prior art, the present technical solution does not need to design the spiral groove to be relatively thick and deep, and can realize the single-feeding double-flow channel extrusion production mode through the combination of the first branch flow channel and the second branch flow channel, which is beneficial to eliminate the fusion mark and can produce high-yield and high-quality pipe products at a relatively low extrusion pressure.

[0007] According to some embodiments of the present application, the spiral body is provided with a cooling channel for feeding cold air, the cooling channel being in communication with the forming channel.

[0008] According to some embodiments of the present application, one end of the spiral body is provided with a positioning protrusion abutting against an end surface of the outer sleeve assembly, the positioning protrusion is connected with the outer sleeve assembly by a second screw, and the positioning protrusion can limit the movement of the spiral body relative to the outer sleeve assembly.

[0009] According to some embodiments of the present application, the outer sleeve assembly comprises a spiral sleeve, a contraction sleeve and a die head connected in sequence, the spiral body is located in the spiral sleeve, a part of the die core assembly is located in the spiral sleeve, and another part of the die core assembly is located in the contraction sleeve and the die head.

[0010] According to some embodiments of the present application, the contraction sleeve is connected with the spiral sleeve by a third screw.

[0011] According to some embodiments of the present application, the outer sleeve assembly further comprises a first pressing plate connected with the contraction sleeve by a third screw, and the first pressing plate can limit the die head from being separated from the contraction sleeve.

[0012] According to some embodiments of the present application, the die core assembly comprises a fixed die core and a replaceable die core, the fixed die core is located in the spiral sleeve and the contraction sleeve, the fixed die core is connected with the spiral body, the replaceable die core is located in the die head, and the replaceable die core is connected with the fixed die core.

[0013] According to some embodiments of the present application, the die core assembly further comprises a second pressing plate located in the fixed die core, the second pressing plate, the fixed die core and the spiral body are connected in sequence by a fourth screw, and the second pressing plate can limit the fixed die core from being separated from the spiral body.

[0014] According to some embodiments of the present application, the die core assembly further comprises a positioning rod penetrating through the replaceable die core, the positioning rod is connected with the second pressing plate by a fifth screw, and the positioning rod can limit the replaceable die core from being separated from the fixed die core.

[0015] The pipe forming equipment according to the second aspect of the embodiments of the present application comprises the pipe extrusion die according to the first aspect of the embodiments of the present application.

[0016] According to the pipe forming equipment provided by the embodiment of the present application, at least the following advantages are achieved: the pipe forming equipment is provided with the pipe extrusion die, the plastic fluid flows to the first branch flow channel and the second branch flow channel through the main flow channel, and then converges to the forming channel, so as to complete pipe forming. Compared with the prior art, the technical solution does not need to design the spiral groove to be relatively thick and deep, and can realize the single-feeding double-flow channel extrusion production mode through the combination of the first branch flow channel and the second branch flow channel, which is beneficial to eliminating the weld mark and can produce high-yield and high-quality pipe products at a relatively low extrusion pressure.

[0017] Additional aspects and advantages of the present application will be described in the following description and become apparent from the following description, or will be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0018] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description, taken in conjunction with the accompanying drawings, in which:

[0019] Figure 1 Structure schematic view of the pipe extrusion die of the embodiment of the present application;

[0020] Reference signs:

[0021] Outer die sleeve assembly 10, spiral outer sleeve 11, shrink sleeve 12, die head 13, first pressing plate 14;

[0022] Spiral body 20, main flow channel 21, spiral groove 22, second branch flow channel 23,

[0023] Cooling channel 24, positioning convex part 25;

[0024] First branch flow channel 30, die core assembly 40, fixed die core 41, replaceable die core 42, second pressing plate 43, positioning rod 44, forming channel 50;

[0025] Connecting section 60, feeding port 61. DETAILED DESCRIPTION

[0026] The embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0027] In the description of the present application, it should be understood that the orientation description, such as the orientation or position relationship indicated by the upper, lower, front, rear, left, right and the like, is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and cannot be understood as indicating or implying that the device or element indicated must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application.

[0028] In the description of the present application, if the first, second is described for the purpose of distinguishing technical features, it cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features or implicitly indicating the sequence of the indicated technical features.

[0029] In the description of the present application, unless otherwise explicitly limited, the words such as arrangement, installation, connection and the like should be broadly understood, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0030] As shown in the drawings, Figure 1 The pipe extrusion die according to the first aspect of the present application comprises: an outer sleeve assembly 10; a spiral body 20 arranged in the outer sleeve assembly 10, the spiral body 20 being provided with a main flow channel 21 for feeding plastic fluid and a spiral groove 22 located on the outer wall of the spiral body 20, the first flow channel 30 being formed between the spiral groove 22 and the outer sleeve assembly 10, and the inlet end of the first flow channel 30 being in communication with the main flow channel 21; a die core assembly 40 arranged in the outer sleeve assembly 10 and connected with the spiral body 20, and a forming channel 50 being arranged between the die core assembly 40 and the outer sleeve assembly 10; wherein the spiral body 20 is further provided with a second flow channel 23, the inlet end of the second flow channel 23 being in communication with the main flow channel 21, and the outlet end of the first flow channel 30 and the outlet end of the second flow channel 23 both being in communication with the forming channel 50.

[0031] It should be noted that in some embodiments of the present application, a connecting section 60 is further included, the connecting section 60 being connected with the spiral body 20 through a first screw, and the connecting section 60 being provided with a feeding port 61 for feeding plastic fluid, the feeding port 61 being in communication with the main flow channel 21.

[0032] The pipe extrusion die according to the present application adopts the above structure, the plastic fluid flows to the first flow channel 30 and the second flow channel 23 through the main flow channel 21 respectively, and then converges to the forming channel 50, thereby completing the pipe forming. Compared with the prior art, the present technical solution does not need to design the spiral groove 22 to be relatively thick and deep, and can realize the single-feeding double-flow channel extrusion production mode through the combination of the first flow channel 30 and the second flow channel 23, which is beneficial to eliminating the weld marks and can produce high-yield and high-quality pipe products at a relatively low extrusion pressure.

[0033] It can be understood that, as Figure 1 shown in the figure, in some embodiments of the present application, a cooling channel 24 for passing cold air is arranged on the spiral body 20, the cooling channel 24 is communicated with the forming channel 50, an air extractor can be externally connected to the cooling channel 24, cold air can be sent into the cooling channel 24, and then the pipe material in the forming channel 50 is accelerated to be cooled and formed.

[0034] As Figure 1 shown in the figure, in some embodiments of the present application, a positioning protrusion 25 is arranged at one end of the spiral body 20, the positioning protrusion 25 abuts against an end face of the outer mold sleeve assembly 10, the positioning protrusion 25 is connected with the outer mold sleeve assembly 10 through a second screw, and the positioning protrusion 25 can limit the movement of the spiral body 20 relative to the outer mold sleeve assembly 10, so that the structure is compact, the stability is good, and the disassembly and maintenance are facilitated.

[0035] As Figure 1 shown in the figure, in some embodiments of the present application, the outer mold sleeve assembly 10 includes a spiral sleeve 11, a contraction sleeve 12 and a die head 13 connected in sequence, the spiral body 20 is located in the spiral sleeve 11, a part of the mold core assembly 40 is located in the spiral sleeve 11, and another part of the mold core assembly 40 is located in the contraction sleeve 12 and the die head 13. By adopting the above structure, the plastic fluid flows through the first shunt channel 30 between the spiral sleeve 11 and the spiral body 20 and the second shunt channel 23 of the spiral body 20, converges to the forming channel 50, and is accelerated and cooled through the contraction sleeve 12, so that the pipe material is further compressed and densified, then the die head 13 and the mold core assembly 40 are stretched and formed to produce a pipe material with a specified wall thickness and shape, the generation of air bubbles is reduced, the product gloss is improved, the application range is wide, the installation is facilitated during use, the pipe material quality is greatly improved compared with the previous one, and the requirements of customers can be better met.

[0036] As Figure 1 shown in the figure, in some embodiments of the present application, the contraction sleeve 12 is connected with the spiral sleeve 11 through a third screw, so that the structure is simple, and the disassembly and maintenance are facilitated.

[0037] As Figure 1 shown in the figure, in some embodiments of the present application, the outer mold sleeve assembly 10 further includes a first pressing plate 14, the first pressing plate 14 is connected with the contraction sleeve 12 through a fourth screw, and the first pressing plate 14 can limit the die head 13 from being separated from the contraction sleeve 12, so that the structure is compact and the stability is good.

[0038] In some embodiments of the present application, the mold core assembly 40 comprises a fixed mold core 41 and a replaceable mold core 42, the fixed mold core 41 is located in the spiral sleeve 11 and the shrink sleeve 12, the fixed mold core 41 is connected with the spiral body 20, the replaceable mold core 42 is located in the die head 13, and the replaceable mold core 42 is connected with the fixed mold core 41. By replacing the die head 13 and the replaceable mold core 42, the pipe with corresponding wall thickness and shape can be produced, and the application range is wide.

[0039] As shown in the drawings, Figure 1 In some embodiments of the present application, the mold core assembly 40 further comprises a second pressing plate 43, the second pressing plate 43 is located in the fixed mold core 41, the second pressing plate 43, the fixed mold core 41 and the spiral body 20 are connected in turn by the fourth screw, and the second pressing plate 43 can limit the fixed mold core 41 from being separated from the spiral body 20. The structure is reasonable and compact, easy to disassemble and maintain, and has good stability and is not easy to loosen.

[0040] As shown in the drawings, Figure 1 In some embodiments of the present application, the mold core assembly 40 further comprises a positioning rod 44, the positioning rod 44 is provided in the replaceable mold core 42, the positioning rod 44 is connected with the second pressing plate 43 by the fifth screw, and the positioning rod 44 can limit the replaceable mold core 42 from being separated from the fixed mold core 41. By using the above structure, the relative position of the replaceable mold core 42 and the die head 13 is fixed, and the replaceable mold core 42 is limited from being separated from the fixed mold core 41. The structure is compact and has good stability.

[0041] It should be noted that there is a gap between the fixed mold core 41 and the spiral sleeve 11, the shrink sleeve 12 and a gap between the replaceable mold core 42 and the die head 13 to form the above-mentioned forming channel 50.

[0042] The pipe forming equipment according to the second aspect of the present application comprises the pipe extrusion die of the first aspect of the present application.

[0043] The pipe forming equipment according to the present application is provided with the pipe extrusion die, the plastic fluid flows to the first branch flow channel 30 and the second branch flow channel 23 respectively through the main flow channel 21, and then converges to the forming channel 50, so as to complete the pipe forming. Compared with the prior art, the spiral groove 22 does not need to be designed to be relatively thick and deep, the single-inlet double-flow channel extrusion production mode can be realized by combining the first branch flow channel 30 and the second branch flow channel 23, which is beneficial to eliminating the weld mark, and high-yield and high-quality pipe products can be produced at a relatively low extrusion pressure.

[0044] It should be noted that the installation and connection of the mold and the pipe forming equipment is in a flange connection mode, and is locked and connected by a die head flange bolt.

[0045] Any technical features in the above embodiments can be combined, and for the sake of brevity, not all possible combinations are described above, however, it should be understood that the application encompasses all possible combinations of the technical features described above.

[0046] Of course, the present application is not limited to the above-described embodiments, and those skilled in the art can make equivalent modifications or replacements without departing from the spirit of the present application, and these equivalent modifications or replacements are all included in the scope defined by the claims of the present application.

Claims

1. A pipe extrusion die, characterized in that, include: Outer mold sleeve assembly (10); A spiral body (20) is disposed inside the outer mold sleeve assembly (10). The spiral body (20) is provided with a main channel (21) for introducing plastic fluid and a spiral groove (22) located on the outer wall of the spiral body (20). A first branch channel (30) is formed between the spiral groove (22) and the outer mold sleeve assembly (10). The inlet end of the first branch channel (30) is connected to the main channel (21). A core assembly (40) is disposed inside the outer mold sleeve assembly (10), and the core assembly (40) is connected to the spiral body (20). A forming channel (50) is provided between the core assembly (40) and the outer mold sleeve assembly (10). The spiral body (20) is also provided with a second diversion channel (23), the inlet end of the second diversion channel (23) is connected to the main channel (21), and the outlet end of the first diversion channel (30) and the outlet end of the second diversion channel (23) are both connected to the forming channel (50). The outer mold sleeve assembly (10) includes a spiral outer sleeve (11), a shrink sleeve (12) and a die (13) connected in sequence. The spiral body (20) is located in the spiral outer sleeve (11), a part of the mold core assembly (40) is located in the spiral outer sleeve (11), and another part of the mold core assembly (40) is located in the shrink sleeve (12) and the die (13). The mold core assembly (40) includes a fixed mold core (41) and a replaceable mold core (42). The fixed mold core (41) is located inside the spiral outer sleeve (11) and the shrink sleeve (12). The fixed mold core (41) is connected to the spiral body (20). The replaceable mold core (42) is located inside the die (13) and is connected to the fixed mold core (41). The mold core assembly (40) further includes a second pressure plate (43), which is located inside the fixed mold core (41). The second pressure plate (43), the fixed mold core (41), and the spiral body (20) are connected in sequence by a fourth screw, and the second pressure plate (43) can restrict the fixed mold core (41) from detaching from the spiral body (20). The mold core assembly (40) also includes a positioning rod (44), which passes through the replaceable mold core (42). The positioning rod (44) is connected to the second pressure plate (43) by a fifth screw, and the positioning rod (44) can restrict the replaceable mold core (42) from detaching from the fixed mold core (41). The spiral (20) is provided with a cooling channel (24) for introducing cold air, and the cooling channel (24) is connected to the forming channel (50).

2. The pipe extrusion die according to claim 1, characterized in that, One end of the spiral (20) is provided with a positioning protrusion (25), which abuts against one end face of the outer mold sleeve assembly (10). The positioning protrusion (25) is connected to the outer mold sleeve assembly (10) by a second screw, and the positioning protrusion (25) can restrict the movement of the spiral (20) relative to the outer mold sleeve assembly (10).

3. The pipe extrusion die according to claim 1, characterized in that, The shrink sleeve (12) is connected to the spiral outer sleeve (11) by a third screw.

4. The pipe extrusion die according to claim 1, characterized in that, The outer mold sleeve assembly (10) further includes a first pressure plate (14), which is connected to the shrink sleeve (12) by a third screw, and the first pressure plate (14) can restrict the die (13) from detaching from the shrink sleeve (12).

5. Pipe forming equipment, characterized in that, Includes the pipe extrusion die according to any one of claims 1 to 4.

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