PE pipe extrusion shaping device and PE pipe production line

Abstract

The utility model provides a PE pipe extrusion shaping device, namely a PE pipe production line, belongs to the plastic moulding field, the PE pipe extrusion shaping device comprises a mouth mould, a core mould, an extrusion part and a cooling part, the mouth mould is sleeved on the periphery of the core mould, a material passing gap is formed between the mouth mould and the core mould, the extrusion part can make the material pass through the material passing gap, and the cooling part can cool the material passing through the mouth mould. The periphery of the mouth mold is provided with a first spiral groove coaxial with the axis of the mouth mold, the cooling part comprises a first cooling pipe, one end of the first cooling pipe is arranged on the periphery of the mouth mold in a winding mode and tightly attached to the inner wall of the first spiral groove, the other end of the first cooling pipe is provided with a first cooling fin, and the first cooling pipe can cool the mouth mold. Compared with the prior art, the cooling device has the advantages that the cooling part is arranged, so that the technical problem that the cooling device of the existing pipe extruder cannot accurately cool the forming die is solved.

Description

Technical Field

[0001] The utility model belongs to the field of plastic molding, and more specifically relates to a PE pipe extrusion and shaping device. The utility model also relates to a PE pipe production line. Background Art

[0002] PE pipe, or polyethylene pipe, is typically processed and formed using a screw extruder. Screw extruders rely on the pressure and shear force generated by the rotating screw to fully plasticize and evenly mix the material, which is then extruded through a die and core mold. Plastic extruders can be generally categorized as twin-screw extruders, single-screw extruders, and the less common multi-screw and screwless extruders.

[0003] In the specific use of existing pipe extruders, after the plastic pipe is quickly extruded and formed through the mold, the temperature of the plastic pipe remains at a high level, and the structural strength of the plastic pipe cannot meet the subsequent transportation, cutting and packaging requirements. To address this technical problem, some manufacturers have installed air supply devices or spray devices at the discharge port of the plastic pipe, but the above-mentioned cooling devices can only cool the extruded plastic pipe, and have poor cooling effect on the plastic pipe forming mold. When the mold temperature is high, the surface quality of the outer periphery of the plastic pipe is poor, which has an adverse effect on the processing quality of the plastic pipe and is in urgent need of improvement. Utility Model Content

[0004] The utility model aims to provide a PE pipe extrusion shaping device to solve the technical problem that the cooling device of the existing pipe extruder cannot cool the forming die.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: to provide a PE pipe extrusion shaping device, including a mouth die, a core die, an extrusion part and a cooling part, the mouth die is arranged on the outer periphery of the core die, and a feeding gap is formed between the mouth die and the core die, the extrusion part can allow the material to pass through the feeding gap, the outer periphery of the mouth die is provided with a first spiral groove coaxial with its own axis, the cooling part includes a first cooling pipe, one end of the first cooling pipe is wound around the outer periphery of the mouth die and is tightly fitted with the inner wall of the first spiral groove, the other end of the first cooling pipe is provided with a first heat sink, and the first cooling pipe can cool the mouth die.

[0006] In a possible implementation, the cooling unit further includes a first heat dissipation fan, and the first heat dissipation fan is used to cool the first heat sink.

[0007] In one possible implementation, the cooling part also includes a second cooling tube, one end of the second cooling tube is wrapped around the outer circumference of the die, the other end of the second cooling tube is provided with a second heat sink, and the cooling temperature of the second cooling tube is higher than the cooling temperature of the first cooling tube, the outer circumference of the die is provided with a second spiral groove for connecting the second cooling tube, the second cooling tube is tightly fitted to the inner wall of the second spiral groove, and the second spiral groove is located between the first spiral groove and the feed end of the die.

[0008] In one possible implementation, the extrusion part includes an extrusion barrel, an extrusion rod and a spiral extrusion plate. The extrusion barrel is provided with a discharge port leading to the feed gap, and the end of the extrusion barrel away from the discharge port is provided with a feed port, and the feed port is provided at the top of the extrusion barrel. The axis of the spiral extrusion plate is parallel to the horizontal direction and coincides with the axis of the extrusion rod and the extrusion barrel. The extrusion rod can drive the spiral extrusion plate to rotate around its own axis. One side of the spiral extrusion plate in the width direction is integrally connected to the extrusion rod, and the other side is sealed with the inner wall of the extrusion barrel.

[0009] In a possible implementation, the core mold is rotatably connected to the extrusion rod, and the outer diameter of the core mold is the same as the outer diameter of the extrusion rod.

[0010] In a possible implementation, along a direction facing the core mold, a diameter of the extrusion cylinder at one end close to the core mold gradually decreases.

[0011] In a possible implementation, the pitch of the spiral extrusion plate gradually decreases in a direction approaching the core mold.

[0012] In one possible implementation, the extrusion part also includes a drive motor and a material box, the top of the material box is provided with a feed flap, and the bottom is connected to the feed port, the drive motor is arranged on the side of the extrusion barrel away from the discharge port, and the drive motor can drive the extrusion rod to rotate.

[0013] In a possible implementation, the PE pipe extrusion and shaping device further includes a mounting frame, and the drive motor and the extrusion barrel are both arranged on the top of the mounting frame.

[0014] Compared with the prior art, the beneficial effects of the PE pipe extrusion shaping device provided by the utility model are:

[0015] First, the material can flow to the material gap under the drive of the extruder, and then the die and the core die can extrude the material flowing through the material gap, and extrude the PE material into a PE pipe during the continuous flow of the material; in addition to the above beneficial effects, under the cooling effect of the cooling pipe, the heat in the PE pipe extrusion process can be indirectly taken away by lowering the temperature of the die, so that the pipe can be quickly cooled and formed, so that the pipe can be subsequently transported and processed, thereby improving the processing efficiency of the pipe; not only that, after cooling the die, the adhesion strength between the PE material and the inner surface of the die can be reduced, and the molding quality of the outer surface of the pipe can be improved.

[0016] Another object of the present invention is to provide a PE pipe production line, comprising the PE pipe extrusion and shaping device described above.

[0017] Compared with the prior art, the PE pipe production line in the present invention has all the benefits of the above-mentioned PE pipe extrusion shaping device, which will not be described here. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0019] Figure 1 This is a front view of the PE pipe extrusion shaping device provided by the utility model;

[0020] Figure 2 This is a schematic diagram of the internal structure of the PE pipe extrusion and shaping device of the present invention.

[0021] In the picture:

[0022] 1. Die; 11. First spiral groove; 12. Second spiral groove;

[0023] 2. Core mold; 21. Material gap;

[0024] 3. Extrusion unit; 31. Extrusion barrel; 32. Extrusion rod; 33. Screw extrusion plate; 34. Drive motor;

[0025] 4. Cooling unit; 41. First cooling tube; 42. First heat sink; 43. First cooling fan; 44. Second cooling tube; 45. Second heat sink; 46. Second cooling fan;

[0026] 5. Install the frame. DETAILED DESCRIPTION

[0027] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein can be combined with each other.

[0028] In the description of the present invention, it should be noted that if terms such as "upper", "lower", "inner", and "back" appear to indicate orientation or positional relationships, they are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as a limitation on the present invention.

[0029] Furthermore, in the description of this utility model, unless otherwise expressly defined, the terms "mounted," "connected," "connection," and "connector" should be interpreted broadly. For example, a connection can be a fixed connection, a removable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediary, or internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0030] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0031] Please also refer to Figures 1 to 2 The PE pipe extrusion shaping device provided by the present invention will now be described. The PE pipe extrusion shaping device includes a die 1, a core die 2, an extrusion unit 3, and a cooling unit 4. The die 1 is sleeved around the outer periphery of the core die 2, and a material passing gap 21 is formed between the die 1 and the core die 2. The extrusion unit 3 allows material to pass through the material passing gap 21. The outer periphery of the die 1 is provided with a first spiral groove 11 coaxial with its own axis. The cooling unit 4 includes a first cooling pipe 41. One end of the first cooling pipe 41 is wound around the outer periphery of the die 1 and closely fits the inner wall of the first spiral groove 11. The other end of the first cooling pipe 41 is provided with a first heat sink 42. The first cooling pipe 41 can cool the die 1.

[0032] Compared with the prior art, first, driven by the extrusion unit 3, the material flows to the material gap 21, and then the die 1 and core die 2 in this embodiment can extrude the material flowing through the material gap 21, and extrude the PE material into a PE tube during the continuous flow of the material; at the same time, under the cooling effect of the cooling tube, the heat generated during the extrusion of the PE tube can be indirectly removed by lowering the temperature of the die 1, so that the PE tube can be quickly cooled and formed to facilitate the subsequent transportation and processing of the PE tube, thereby improving the processing efficiency of the PE tube; moreover, after cooling the die 1, the adhesion between the PE material and the inner surface of the die 1 can be reduced, thereby improving the molding quality of the outer peripheral surface of the PE tube. Based on the above embodiment, a feasible implementation method is proposed, in which the cooling unit 4 also includes a first heat dissipation fan 43, which is used to cool the first heat sink 42, so that the heat of the first heat sink 42 is removed by the first heat dissipation fan 43 blowing on the first heat sink 42, thereby making the heat exchange process of the first cooling tube 41 more rapid.

[0033] In a feasible embodiment, the cooling part 4 also includes a second cooling pipe 44, one end of the second cooling pipe 44 is wound around the outer periphery of the die 1, and the other end of the second cooling pipe 44 is provided with a second heat sink 45, and the cooling temperature of the second cooling pipe 44 is higher than the cooling temperature of the first cooling pipe 41, and the outer periphery of the die 1 is provided with a second spiral groove 12 for connecting the second cooling pipe 44, the second cooling pipe 44 is tightly fitted with the inner wall of the second spiral groove 12, and the second spiral groove 12 is located between the first spiral groove 11 and the feed end of the die 1. In this way, this embodiment can cool the die 1 at the same time through two cooling pipes with different temperatures, forming a temperature gradient on the die 1, preventing the die 1 from causing too large a temperature gradient during the PE pipe forming process due to rapid temperature cooling. The subsequent PE pipe that is cooled too quickly will directly harden, which is not only prone to accumulate stress during the cooling process, but also prone to distortion and deformation of the PE pipe due to factors such as gravity, thereby making the cooling and forming process of the PE pipe more reasonable. Optionally, the first cooling tube 41 and the second cooling tube 44 are both configured as heat pipes to enhance the cooling effect of the die 1, and the cooling portion 4 further includes a second cooling fan 46 for dissipating heat from the second heat sink 45, and the rotation speed (heat dissipation capacity) of the second cooling fan 46 is greater than that of the first cooling fan 43, so that the cooling temperature of the second cooling tube 44 is higher than the cooling temperature of the first cooling tube 41.

[0034] According to the above embodiment, further, the extrusion part 3 includes an extrusion barrel 31, an extrusion rod 32 and a spiral extrusion plate 33. The extrusion barrel 31 is provided with a discharge port leading to the feed gap 21, and the end of the extrusion barrel 31 away from the discharge port is provided with a feed port, and the feed port is provided at the top of the extrusion barrel 31. The axis of the spiral extrusion plate 33 is parallel to the horizontal direction and coincides with the axis of the extrusion rod 32 and the extrusion barrel 31. The extrusion rod 32 can drive the spiral extrusion plate 33 to rotate around its own axis. One side of the spiral extrusion plate 33 in the width direction is integrally connected to the extrusion rod 32, and the other side is connected to the feed gap 21. It is sealed with the inner wall of the extrusion barrel 31 so that the material is squeezed from the feed port of the extrusion barrel 31 to the discharge port through the rotation of the spiral extrusion plate 33, and the discharge speed of the spiral extrusion plate 33 is more stable and controllable, which is beneficial to controlling the discharge speed of the material and the forming speed of the PE pipe; in a preferred embodiment, the outer diameter of the core mold 2 in the above embodiment can be set to be the same as the outer diameter of the extrusion rod 32, and the core mold 2 is rotatably connected to the extrusion rod 32 to make the flow process of the material to the feed gap 21 smoother, and the feed port of the feed gap 21 is less likely to have problems such as material jamming.

[0035] Based on the above embodiment, a feasible implementation method is proposed. Specifically, along the direction facing the core mold 2, the diameter of the extrusion barrel 31 at one end close to the core mold 2 gradually decreases. In this way, this embodiment can enhance the extrusion force on the material, making the material denser, which is beneficial to improving the molding quality of the PE pipe.

[0036] Similar to the above embodiment, in order to further extrude the material, a feasible implementation method is proposed. Specifically, the pitch of the spiral extrusion plate 33 gradually decreases in the direction close to the core mold 2, so that the material that subsequently enters the extrusion barrel 31 can push the material that enters the extrusion barrel 31 first, making the extrusion process of the material more reasonable and discharging bubbles in the material, which is beneficial to improving the molding quality of the PE pipe.

[0037] Based on the above embodiments, a feasible implementation method is proposed, in which the extrusion part 3 also includes a drive motor 34 and a material box. A feed flap is provided on the top of the material box, and the bottom is connected to the feed port. The drive motor 34 is arranged on the side of the extrusion barrel 31 away from the discharge port, and the drive motor 34 can drive the extrusion rod 32 to rotate, thereby improving the continuity and stability of the spiral extrusion plate 33 in extruding the material, and ensuring that the extrusion force and extrusion speed of the material are consistent.

[0038] In order to facilitate the installation of the above-mentioned structures, in a feasible embodiment, the PE pipe extrusion and shaping device also includes a mounting frame 5, and the drive motor 34 and the extrusion barrel 31 are both arranged on the top of the mounting frame 5. Optionally, the two fans mentioned above are both arranged inside the mounting frame 5 to save space occupied by the entire PE pipe extrusion and shaping device.

[0039] In summary, the present invention can extrude the material flowing through the material gap 21 through the die 1 and the core die 2, and extrude the PE material into a PE tube during the continuous flow of the material; at the same time, under the cooling effect of the cooling tube, the heat generated during the extrusion of the PE tube can be indirectly removed by lowering the temperature of the die 1, allowing the PE tube to be quickly cooled and formed, facilitating the subsequent transportation and processing of the PE tube, thereby improving the processing efficiency of the PE tube; not only that, after cooling the die 1, the adhesion between the PE material and the inner surface of the die 1 can be reduced, thereby improving the molding quality of the outer peripheral surface of the PE tube. Moreover, the present invention can also form a stepped temperature distribution in the die 1 through the two cooling tubes, which can not only quickly cool and form the PE tube, but also make the cooling of the PE tube more stable, thereby improving the molding quality of the PE tube.

[0040] Based on the same inventive concept, the present invention also proposes a PE pipe production line, which includes the PE pipe extrusion and shaping device mentioned above.

[0041] Compared with the prior art, the PE pipe production line in the present invention has all the benefits of the above-mentioned PE pipe extrusion shaping device, which will not be described here.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A PE pipe extrusion shaping device, characterized in that: The invention comprises a mouth die (1), a core die (2), an extrusion part (3) and a cooling part (4); the mouth die (1) is sleeved on the outer periphery of the core die (2); a material passing gap (21) is formed between the mouth die (1) and the core die (2); the extrusion part (3) can allow material to pass through the material passing gap (21); the outer periphery of the mouth die (1) is provided with a first spiral groove (11) coaxial with its own axis; the cooling part (4) comprises a first cooling pipe (41); one end of the first cooling pipe (41) is wound around the outer periphery of the mouth die (1) and is tightly fitted with the inner wall of the first spiral groove (11); the other end of the first cooling pipe (41) is provided with a first heat sink (42); the first cooling pipe (41) can cool the mouth die (1).

2. The PE pipe extrusion shaping device according to claim 1, characterized in that: The cooling unit (4) further includes a first heat dissipation fan (43), and the first heat dissipation fan (43) is used to cool the first heat sink (42).

3. The PE pipe extrusion shaping device according to claim 2, characterized in that: The cooling portion (4) further comprises a second cooling tube (44), one end of which is wound around the outer periphery of the die (1), and the other end of which is provided with a second heat sink (45), and the cooling temperature of the second cooling tube (44) is higher than the cooling temperature of the first cooling tube (41), and the outer periphery of the die (1) is provided with a second spiral groove (12) for connecting the second cooling tube (44), the second cooling tube (44) is tightly fitted with the inner wall of the second spiral groove (12), and the second spiral groove (12) is located between the first spiral groove (11) and the feed end of the die (1).

4. The PE pipe extrusion shaping device according to claim 1, characterized in that: The extrusion part (3) includes an extrusion barrel (31), an extrusion rod (32) and a spiral extrusion plate (33). The extrusion barrel (31) is provided with an outlet leading to the feed gap (21), and an inlet is provided at one end of the extrusion barrel (31) away from the outlet, and the inlet is provided at the top of the extrusion barrel (31). The axis of the spiral extrusion plate (33) is parallel to the horizontal direction and coincides with the axes of the extrusion rod (32) and the extrusion barrel (31). The extrusion rod (32) can drive the spiral extrusion plate (33) to rotate around its own axis. One side of the spiral extrusion plate (33) in the width direction is integrally connected to the extrusion rod (32), and the other side is sealed with the inner wall of the extrusion barrel (31).

5. The PE pipe extrusion shaping device according to claim 4, characterized in that: The core mold (2) is rotatably connected to the extrusion rod (32), and the outer diameter of the core mold (2) is the same as the outer diameter of the extrusion rod (32).

6. The PE pipe extrusion shaping device according to claim 5, characterized in that: Along the direction facing the core mold (2), the diameter of the extrusion cylinder (31) at one end close to the core mold (2) gradually decreases.

7. The PE pipe extrusion shaping device according to claim 5, characterized in that: The pitch of the spiral extrusion plate (33) gradually decreases in a direction approaching the core mold (2).

8. The PE pipe extrusion shaping device according to claim 7, characterized in that: The extrusion part (3) further includes a driving motor (34) and a material box. The top of the material box is provided with a feed flap, and the bottom is connected to the feed port. The driving motor (34) is provided on a side of the extrusion barrel (31) away from the discharge port, and the driving motor (34) can drive the extrusion rod (32) to rotate.

9. The PE pipe extrusion shaping device according to claim 8, characterized in that: The PE pipe extrusion shaping device further comprises a mounting frame (5), and the driving motor (34) and the extrusion barrel (31) are both arranged on the top of the mounting frame (5).

10. A PE pipe production line, characterized in that: It comprises the PE pipe extrusion shaping device as described in any one of claims 1 to 9.

Images