MPP pipe extrusion die assembly with quick die changing

Abstract

The application discloses a MPP pipe extrusion die assembly capable of quickly changing dies, relates to the technical field of MPP pipe production, and comprises an extruder body and a die, a feeding hopper is fixedly connected to the top end of the extruder body, a discharge port is fixedly connected to one end of the feeding hopper, the die is composed of a mounting plate, a die head and a core rod, and a mounting mechanism and a connecting mechanism are arranged. Through the mounting mechanism and the connecting mechanism, the reinforcing block is separated from the rotating ring by rotating the rotating column, the pressing plate is separated from the clamping block, the rotating ring is rotated to drive the rotating plate and the rotating block to move away from the first connecting ring, the rotating block is rotated to enter the displacement groove, the butt joint rod can be displaced out of the butt joint groove, the mounting plate can be removed, then the reinforcing block is pulled, the clamping block is separated from the inserting rod, the pressing ring is removed, the fixing of the die head and the core rod is automatically released, the die head and the core rod are replaced, and then the mounting plate, the die head and the core rod are installed, so that the components on the die can be quickly removed and replaced.

Description

Technical Field

[0001] This invention relates to the field of MPP pipe manufacturing technology, specifically to an MPP pipe extrusion die assembly with quick die change capability. Background Technology

[0002] MPP (Modified Polypropylene) power cable protection pipes are widely used in municipal, power, and telecommunications pipeline projects due to their excellent high-temperature resistance, tensile and compressive strength, and insulation properties, especially in trenchless laying scenarios where they have irreplaceable advantages. In the production process of MPP pipes, the extrusion die is the core forming component, and its structural design directly affects the dimensional accuracy and product quality of the pipe. The die typically consists of components such as a mounting plate, die head, and mandrel. When producing pipes of different specifications, the die assembly must be replaced entirely or partially.

[0003] Existing technologies already include improved solutions for extrusion die replacement. For example, Chinese patent CN201235599Y discloses a plastic pipe extrusion die, which connects the die head and adjustment seat through evenly distributed adjusting screws and uses a spherical mating structure to adjust the gap between the core die and the die head. While this solution improves the convenience of die head adjustment to some extent, disassembling and assembling the die head still requires tightening multiple sets of screws one by one, making the operation cumbersome and the replacement efficiency low. Chinese patent CN208277398U proposes an MPP pipe extrusion die, which uses four variable-diameter rollers to form a circular sizing structure, and adjusts the position of the rollers with bolts to adapt to different pipe diameter requirements. However, this solution only involves the adjustment of the sizing part and does not solve the problem of quick disassembly and assembly of the entire die head assembly, and the adjustment of the roller position still requires tools to operate one by one. Chinese patent CN211683372U discloses an extrusion die replacement device that uses a support frame and support block to assist in the handling and positioning of the die head, thereby reducing the burden of manual operation. However, this device is an external auxiliary tooling, mainly to solve the problem of heavy die head and difficult handling. It does not involve the improvement of the connection structure between the die head and the extruder body itself. When replacing it, the connecting bolts still need to be disassembled and reassembled one by one.

[0004] In summary, although numerous related technologies have attempted to improve the ease of assembly and disassembly of extrusion dies, existing solutions generally suffer from the following shortcomings: First, the assembly and disassembly of die components largely rely on bolt fastening structures, requiring tools for individual operations during replacement, which is time-consuming and labor-intensive, severely restricting production line changeover efficiency. Second, the fixing and disassembly of the mounting plate, die, and mandrel are independent, lacking a coordinated design, making it impossible to achieve rapid overall release and locking of the die assembly. Third, improvements to existing MPP pipe-specific extrusion dies primarily focus on sizing adjustment or auxiliary handling, with insufficient attention paid to the rapid die replacement requirements of the connection structure between the die and the extruder body. Therefore, a technical solution capable of enabling rapid overall replacement of MPP pipe extrusion die assemblies is urgently needed to address these issues. Summary of the Invention

[0005] The purpose of this invention is to provide an MPP pipe extrusion die assembly that allows for quick die replacement, in order to facilitate the replacement of the die head.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an MPP pipe extrusion die assembly with quick die change capability, comprising an extruder body and a die head. A feed hopper is fixedly connected to the top of the extruder body, and a discharge port is fixedly connected to one end of the feed hopper. The die head is located at one end of the discharge port. The die head consists of a mounting plate, a die nozzle, and a mandrel. The die nozzle and the mandrel are mounted on the mounting plate via a mounting mechanism. The mounting plate is mounted to one end of the discharge port via a connecting mechanism. The mounting mechanism includes a connecting rod, which is fixedly connected to the outer wall of the mandrel. The outer wall of the connecting rod has a positioning groove. A vertical plate is fixedly connected to the inner wall of the mounting plate. The outer wall of the vertical plate has a connecting groove. A positioning plate extending to the inner wall of the connecting groove is slidably connected to the inside of the mounting plate. A guide groove is provided on the outer wall of the positioning plate. A guide rod is slidably connected to the inner wall of the guide groove. An extrusion block is fixedly connected to the outer wall of the guide rod. The extrusion block is slidably connected to the inside of the mounting plate and extends out of the mounting plate.

[0007] As a further embodiment of the present invention: the mounting mechanism further includes a clamping ring, which is disposed at one end of the die. A rod is fixedly connected to the outer wall of the clamping ring. A mounting base is fixedly connected to the outer wall of the mounting plate above and below the die. A slot is provided at one end of the mounting base. A locking block extending into the inner cavity of the slot is slidably connected inside the mounting base. A first spring is connected between the locking block and the mounting base. A pull rod is fixedly connected to the outer wall of the locking block, and the pull rod extends out of the mounting base.

[0008] As a further embodiment of the present invention: the connecting mechanism includes a first connecting ring, which is fixedly connected to the outer wall of the discharge port. The outer wall of the first connecting ring has a mating groove. The outer wall of the mounting plate is fixedly connected to a second connecting ring. The outer wall of the second connecting ring is fixedly connected to a mating rod. The outer wall of the mounting plate is rotatably connected to a rotating ring. The outer wall of the second connecting ring is rotatably connected to the outer wall of the rotating ring. A first spur gear is rotatably connected to one end of the first spur gear. The outer wall of the mating rod has a displacement groove. The inner wall of the displacement groove is slidably connected to a rotating plate. The outer wall of the rotating plate is rotatably connected to a rotating block. The first threaded rod passes through the rotating plate.

[0009] As a further embodiment of the present invention: the connecting mechanism further includes a rotating column, which is rotatably connected to the outer wall of the mounting base. A second threaded rod is fixedly connected to the outer wall of the rotating column. A movable block is threadedly connected to the outer wall of the second threaded rod. The movable block is slidably connected to the interior of the mounting base. A pressure plate is fixedly connected to the outer wall of the movable block. A second spur gear is rotatably connected to the interior of the mounting base located on the outer wall of the movable block. A reinforcing block is slidably connected to the interior of the mounting base located on the outer wall of the second spur gear. The reinforcing block extends out of the mounting base.

[0010] As a further embodiment of the present invention: the outer wall of the connecting rod is in contact with the inner wall of the connecting groove, the inner wall of the positioning groove is in contact with the outer wall of one end of the positioning plate, and the outer wall of the guide rod is in contact with the inner wall of the guide groove.

[0011] As a further embodiment of the present invention: the outer wall of the insertion rod is fitted with the inner wall of the slot, the outer wall of the insertion rod is provided with ratchet teeth, and one end of the locking block is engaged with the ratchet teeth.

[0012] As a further embodiment of the present invention: the inner wall of the docking groove is in contact with the outer wall of the docking rod.

[0013] As a further embodiment of the present invention: the outer wall of the rotating ring is provided with a toothed groove, which meshes with the first spur gear.

[0014] As a further embodiment of the present invention: the outer wall of the rotating plate is provided with a first threaded hole, the first threaded hole is matched with the first threaded rod, and the outer wall of the rotating plate is in contact with the inner wall of the displacement groove.

[0015] As a further embodiment of the present invention: the outer walls of the movable block and the reinforcing block are provided with gear teeth, which mesh with the second spur gear; the inner wall of the rotating ring is provided with a slot, one end of the reinforcing block is engaged with the slot; the outer wall of the movable block is provided with a second threaded hole, which matches the second threaded rod.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention enables rapid assembly and disassembly of the mold head assembly, significantly improving changeover efficiency. By employing a connecting mechanism, a rotating ring drives a first spur gear and a first threaded rod to rotate, causing a rotating plate and a rotating block to move linearly along a displacement groove. This allows the rotating block to contact or separate from the first connecting ring, achieving rapid locking and releasing between the mounting plate and the discharge port. Compared to existing technologies (such as CN201235599Y and CN211683372U) that require tools to individually install and remove multiple sets of bolts, this invention only requires rotating the rotating ring to complete the overall fixing or disassembly of the mounting plate. This greatly simplifies the operation, reducing single mold changeover time from tens of minutes to just a few minutes, significantly improving production line changeover efficiency.

[0017] 2. The die and mandrel adopt a linked installation structure to achieve automatic locking and unlocking. This invention, through the installation mechanism, allows the die to simultaneously push the extrusion block as it moves towards the mounting plate. Through the sliding engagement of the guide rod and guide groove, the positioning plate automatically engages with the positioning groove on the mandrel connecting rod, achieving synchronous locking of the mandrel. Conversely, when the die is disassembled, the die separates from the extrusion block, the positioning plate automatically exits the positioning groove, and the mandrel lock is simultaneously released. This linked design eliminates the need for separate installation and disassembly of the die and mandrel, further simplifying the operation process compared to the existing technology where the mandrel and die need to be fixed separately, and avoiding assembly quality problems caused by omissions or misinstallation.

[0018] 3. A dual locking mechanism ensures the reliability and safety of the die head. After the rotating ring locks the mounting plate, the invention drives the second threaded rod to rotate via a rotating column, causing the movable block to move. This serves two purposes: firstly, the pressure plate tightly presses against the locking block, preventing accidental disengagement of the locking block from the insert rod, thus reinforcing the die's clamping ring; secondly, through a second spur gear transmission, the reinforcing block is driven to engage with the groove in the rotating ring, locking the rotating ring in place. This dual locking structure effectively prevents loosening of the connection caused by equipment vibration, ensuring the reliability and safety of the die head under high-pressure, high-temperature extrusion conditions.

[0019] 4. Easy to operate, requiring no special tools, reducing the skill requirements for operators. The entire assembly and disassembly of the mold head assembly can be completed by manually rotating the rotating ring, rotating column, and rotating block, without the need for special tools such as wrenches and screwdrivers. The operation is intuitive and simple, reducing the technical proficiency requirements for operators and also reducing tooling and management costs.

[0020] In summary, this invention effectively solves the problems of cumbersome operation, low efficiency, and independent assembly and disassembly of components in the existing MPP pipe extrusion die replacement process, and realizes the rapid, safe and convenient replacement of die components, which has good prospects for promotion and application. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a cross-sectional view of the mounting plate and the die of the present invention; Figure 3 This is a schematic diagram of the installation of the core rod of the present invention; Figure 4 This is a schematic diagram of the positioning plate of the present invention; Figure 5 This is a schematic diagram of the installation of the clamping ring of the present invention; Figure 6 This is a schematic diagram of the installation of the rotating ring of the present invention; Figure 7 This is a cross-sectional view of the mounting base of the present invention; Figure 8 This is a schematic diagram of the installation of the mounting plate of the present invention.

[0022] In the diagram: 1. Extruder body; 2. Feed hopper; 3. Discharge port; 4. Mounting plate; 5. Die; 6. Mandrel; 7. Mounting mechanism; 701. Connecting rod; 702. Positioning groove; 703. Vertical plate; 704. Connecting groove; 705. Positioning plate; 706. Guide groove; 707. Guide rod; 708. Extrusion block; 709. Clamping ring; 710. Insert rod; 711. Mounting base; 712. Slot; 713. Locking block; 714. First spring 715. Tie rod; 8. Connecting mechanism; 801. First connecting ring; 802. Connecting groove; 803. Second connecting ring; 804. Connecting rod; 805. Rotating ring; 806. First spur gear; 807. First threaded rod; 808. Displacement groove; 809. Rotating plate; 810. Rotating block; 811. Rotating column; 812. Second threaded rod; 813. Movable block; 814. Second spur gear; 815. Reinforcing block; 816. Pressure plate. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this invention, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," and "set up" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. The following describes embodiments of the invention based on its overall structure.

[0025] Please see Figures 1 to 8 In this embodiment of the invention, an MPP pipe extrusion die assembly with quick die change capability includes an extruder body 1 and a die head. A feed hopper 2 is fixedly connected to the top of the extruder body 1, and an outlet 3 is fixedly connected to one end of the feed hopper 2. The die head is located at one end of the outlet 3 and consists of a mounting plate 4, a die 5, and a mandrel 6. The die 5 and mandrel 6 are mounted on the mounting plate 4 via a mounting mechanism 7. The mounting plate 4 is mounted to one end of the outlet 3 via a connecting mechanism 8. The mounting mechanism 7 includes a connecting rod 701, which is fixedly connected to the outer wall of the mandrel 6. A positioning groove 702 is formed on the outer wall of the connecting rod 701. A vertical plate 703 is fixedly connected to the inner wall of the mounting plate 4, and a connecting groove 704 is formed on the outer wall of the vertical plate 703. A positioning plate 705 extending to the inner wall of the connecting groove 704 is slidably connected inside the mounting plate 4. The outer wall of the 05 is provided with a guide groove 706, and the inner wall of the guide groove 706 is slidably connected with a guide rod 707. The outer wall of the guide rod 707 is fixedly connected with a pressing block 708. The pressing block 708 is slidably connected to the inside of the mounting plate 4 and extends out of the mounting plate 4. The mounting mechanism 7 also includes a clamping ring 709, which is located at one end of the die 5. The outer wall of the clamping ring 709 is fixedly connected with a plug rod 710. The outer wall of the mounting plate 4 is fixedly connected to the upper and lower parts of the die 5 with a mounting seat 711. One end of the mounting seat 711 is provided with a slot 712. The inside of the mounting seat 711 is slidably connected with a locking block 713 that extends into the cavity of the slot 712. A first spring 714 is connected between the locking block 713 and the mounting seat 711. The outer wall of the locking block 713 is fixedly connected with a pull rod 715, which extends out of the mounting seat 711.

[0026] In this embodiment: When installing the die 5 and the mandrel 6, the die 5 and the mandrel 6 are moved simultaneously, and the connecting rod 701 is inserted into the connecting groove 704. At this time, the die 5 is not in contact with the extrusion block 708. Then, the die 5 is pushed to contact the mounting plate 4, and the die 5 contacts the extrusion block 708, pushing the extrusion block 708 to move. At this time, the displacement of the extrusion block 708 drives the guide rod 707 to move. The guide rod 707 slides in the guide groove 706, pushing the positioning plate 705 to position. Move the positioning plate 705 so that one end engages with the positioning groove 702 and fixes the connecting rod 701 in the connecting groove 704, thereby fixing the mandrel 6. After completion, move the clamping ring 709 and fit it onto one end of the die 5. At the same time, insert the rod 710 into the slot 712. At this time, the locking block 713 is engaged with the insert rod 710 by the elastic force of the first spring 714. The clamping ring 709 presses the die 5 onto the mounting plate 4, making it easy to install the die 5 and the mandrel 6 on the mounting plate 4. When disassembling the die 5 and the mandrel 6, pull the lever 715 to move it. The movement of the lever 715 causes the locking block 713 to move and separate from the insertion rod 710. Then, move the clamping ring 709 so that the insertion rod 710 moves out of the slot 712. Remove the clamping ring 709, loosen the die 5, and move the die 5 away from the mounting plate 4. The die 5 separates from the extrusion block 708, and the fixation on the mandrel 6 is automatically released.

[0027] Please refer to this carefully. Figures 6 to 8The connecting mechanism 8 includes a first connecting ring 801, which is fixedly connected to the outer wall of the discharge port 3. A mating groove 802 is formed on the outer wall of the first connecting ring 801. A second connecting ring 803 is fixedly connected to the outer wall of the mounting plate 4. A mating rod 804 is fixedly connected to the outer wall of the second connecting ring 803. A rotating ring 805 is rotatably connected to the outer wall of the mounting plate 4. A first spur gear 806 is rotatably connected to the outer wall of the second connecting ring 803, located on the outer wall of the rotating ring 805. A first threaded rod 807 is fixedly connected to one end of the first spur gear 806. A displacement groove 808 is formed on the outer wall of the mating rod 804. A rotating plate 809 is slidably connected to the inner wall of the displacement groove 808. The outer wall of the rotating plate 809 rotates... A rotating block 810 is connected, and a first threaded rod 807 passes through a rotating plate 809. The connecting mechanism 8 also includes a rotating column 811, which is rotatably connected to the outer wall of the mounting base 711. A second threaded rod 812 is fixedly connected to the outer wall of the rotating column 811. A movable block 813 is threadedly connected to the outer wall of the second threaded rod 812. The movable block 813 is slidably connected to the interior of the mounting base 711. A pressure plate 816 is fixedly connected to the outer wall of the movable block 813. A second spur gear 814 is rotatably connected to the interior of the mounting base 711 located on the outer wall of the movable block 813. A reinforcing block 815 is slidably connected to the interior of the mounting base 711 located on the outer wall of the second spur gear 814. The reinforcing block 815 extends out of the mounting base 711.

[0028] In this embodiment: When installing the mounting plate 4, the mounting plate 4 is attached to one end of the discharge port 3, the connecting rod 804 is inserted into the connecting groove 802, and then the rotating block 810 is rotated out of the displacement groove 808. The rotating ring 805 is rotated, and the rotation of the rotating ring 805 drives the first spur gear 806 to rotate. The rotation of the first spur gear 806 drives the first threaded rod 807 to rotate. The rotation of the first threaded rod 807 drives the rotating plate 809 to slide in the displacement groove 808. The displacement of the rotating plate 809 drives the rotating block 810 to move. The two rotating blocks 810 simultaneously contact the first connecting ring 801, thereby pressing the mounting plate 4 tightly against one end of the discharge port 3. After completion, the rotating column 811 is rotated. 1. Rotation drives the second threaded rod 812 to rotate, which in turn drives the movable block 813 to move. The movement of the movable block 813 drives the second spur gear 814 to rotate, which in turn drives the reinforcing block 815 to move. The reinforcing block 815 moves and engages with the rotating ring 805, thereby fixing the rotating ring 805 and facilitating the fixing of the mounting plate 4 to one end of the discharge port 3. At the same time, the movement of the movable block 813 drives the pressure plate 816 to move. The pressure plate 816 moves and contacts the locking block 713, preventing the locking block 713 from separating from the insertion rod 710, thereby reinforcing the clamping ring 709, and further reinforcing the die 5 and the mandrel 6 to prevent the die 5 and the mandrel 6 from loosening. When disassembling the mold head, rotate the rotating column 811 to separate the reinforcing block 815 from the rotating ring 805, releasing the fixation of the rotating ring 805. Separate the pressure plate 816 from the locking block 713, releasing the fixation of the locking block 713. Rotate the rotating ring 805 to drive the rotating plate 809 and the rotating block 810 away from the first connecting ring 801 and move them away. Rotate the rotating block 810 into the displacement groove 808, thereby displacing the docking rod 804 out of the docking groove 802. Lower the mounting plate 4, then pull the reinforcing block 815, separating the locking block 713 from the insertion rod 710. Remove the clamping ring 709, automatically releasing the fixation of the die 5 and the mandrel 6. Replace the die 5 and the mandrel 6, and then install the mounting plate 4, die 5, and mandrel 6. This facilitates the quick removal and replacement of components on the mold head.

[0029] Please refer to this carefully. Figures 3 to 6 The outer wall of the connecting rod 701 is in contact with the inner wall of the connecting groove 704, the inner wall of the positioning groove 702 is in contact with the outer wall of one end of the positioning plate 705, and the outer wall of the guide rod 707 is in contact with the inner wall of the guide groove 706.

[0030] In this embodiment: the connecting rod 701 is inserted into the connecting groove 704, and then the die 5 is pushed to move and contact the mounting plate 4. The die 5 contacts the extrusion block 708, and the extrusion block 708 is pushed to move. At this time, the displacement of the extrusion block 708 causes the guide rod 707 to move. The guide rod 707 slides in the guide groove 706, pushing the positioning plate 705 to move. One end of the positioning plate 705 is engaged in the positioning groove 702, fixing the connecting rod 701 in the connecting groove 704.

[0031] Please refer to this carefully. Figures 3 to 6 The outer wall of the insertion rod 710 fits against the inner wall of the slot 712. The outer wall of the insertion rod 710 is provided with ratchet teeth, and one end of the locking block 713 engages with the ratchet teeth.

[0032] In this embodiment: the clamping ring 709 is sleeved on one end of the die 5, and the insertion rod 710 is inserted into the slot 712. At this time, the locking block 713 is engaged with the insertion rod 710 by the elastic force of the first spring 714, and the clamping ring 709 presses the die 5 onto the mounting plate 4.

[0033] Please refer to this carefully. Figures 6 to 8 The inner wall of the docking groove 802 fits against the outer wall of the docking rod 804.

[0034] In this embodiment: the mounting plate 4 is attached to one end of the discharge port 3, and the docking rod 804 is inserted into the docking groove 802.

[0035] Please refer to this carefully. Figures 6 to 8The outer wall of the rotating ring 805 is provided with a toothed groove, which meshes with the first spur gear 806. The outer wall of the rotating plate 809 is provided with a first threaded hole, which matches the first threaded rod 807. The outer wall of the rotating plate 809 is in contact with the inner wall of the displacement groove 808.

[0036] In this embodiment: Rotating the rotating ring 805 causes the first spur gear 806 to rotate, which in turn causes the first threaded rod 807 to rotate. The first threaded rod 807 then causes the rotating plate 809 to slide within the displacement groove 808. The displacement of the rotating plate 809 causes the rotating block 810 to move. Both rotating blocks 810 simultaneously contact the first connecting ring 801, thereby pressing the mounting plate 4 against one end of the discharge port 3.

[0037] Please refer to this carefully. Figures 6 to 8 The outer walls of the movable block 813 and the reinforcing block 815 are provided with gear teeth, which mesh with the second spur gear 814. The inner wall of the rotating ring 805 is provided with a slot, and one end of the reinforcing block 815 is engaged with the slot. The outer wall of the movable block 813 is provided with a second threaded hole, which matches the second threaded rod 812.

[0038] In this embodiment: Rotating the rotating column 811 causes the second threaded rod 812 to rotate, which in turn causes the movable block 813 to move, which in turn causes the second spur gear 814 to rotate, which in turn causes the reinforcing block 815 to move, and the reinforcing block 815 to engage with the rotating ring 805, thereby fixing the rotating ring 805.

[0039] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A quick-change MPP pipe extrusion die assembly, characterized in that, The extruder includes an extruder body (1) and a die head. A feed hopper (2) is fixedly connected to the top of the extruder body (1), and a discharge port (3) is fixedly connected to one end of the feed hopper (2). The die head is located at one end of the discharge port (3). The die head is composed of a mounting plate (4), a die (5), and a mandrel (6). The die (5) and the mandrel (6) are mounted on the mounting plate (4) by a mounting mechanism (7). The mounting plate (4) is mounted on one end of the discharge port (3) by a connecting mechanism (8). The mounting mechanism (7) includes a connecting rod (701), which is fixedly connected to the outer wall of the mandrel (6). The outer wall of the connecting rod (701) is provided with a positioning groove (702). The inner wall of the mounting plate (4) is fixedly connected with a vertical plate (703). The outer wall of the vertical plate (703) is provided with a connecting groove (704). The mounting plate (4) is slidably connected with a positioning plate (705) extending to the inner wall of the connecting groove (704). The outer wall of the positioning plate (705) is provided with a guide groove (706). The inner wall of the guide groove (706) is slidably connected with a guide rod (707). The outer wall of the guide rod (707) is fixedly connected with an extrusion block (708). The extrusion block (708) is slidably connected to the inside of the mounting plate (4) and extends out of the mounting plate (4).

2. The MPP pipe extrusion die assembly with quick die change capability according to claim 1, characterized in that, The mounting mechanism (7) further includes a clamping ring (709), which is disposed at one end of the die (5). A plug rod (710) is fixedly connected to the outer wall of the clamping ring (709). A mounting base (711) is fixedly connected to the outer wall of the mounting plate (4) above and below the die (5). A slot (712) is provided at one end of the mounting base (711). A locking block (713) extending into the inner cavity of the slot (712) is slidably connected inside the mounting base (711). A first spring (714) is connected between the locking block (713) and the mounting base (711). A pull rod (715) is fixedly connected to the outer wall of the locking block (713). The pull rod (715) extends out of the mounting base (711).

3. The MPP pipe extrusion die assembly with quick die change capability according to claim 2, characterized in that, The connecting mechanism (8) includes a first connecting ring (801), which is fixedly connected to the outer wall of the discharge port (3). The outer wall of the first connecting ring (801) is provided with a docking groove (802). The outer wall of the mounting plate (4) is fixedly connected with a second connecting ring (803). The outer wall of the second connecting ring (803) is fixedly connected with a docking rod (804). The outer wall of the mounting plate (4) is rotatably connected with a rotating ring (805). The outer wall of the second connecting ring (803) is rotatably connected with a first spur gear (806) located on the outer wall of the rotating ring (805). One end of the first spur gear (806) is fixedly connected with a first threaded rod (807). The outer wall of the docking rod (804) is provided with a displacement groove (808). The inner wall of the displacement groove (808) is slidably connected with a rotating plate (809). The outer wall of the rotating plate (809) is rotatably connected with a rotating block (810). The first threaded rod (807) passes through the rotating plate (809).

4. The MPP pipe extrusion die assembly with quick die change capability according to claim 3, characterized in that, The connecting mechanism (8) further includes a rotating column (811), which is rotatably connected to the outer wall of the mounting base (711). A second threaded rod (812) is fixedly connected to the outer wall of the rotating column (811). A movable block (813) is threadedly connected to the outer wall of the second threaded rod (812). The movable block (813) is slidably connected to the interior of the mounting base (711). A pressure plate (816) is fixedly connected to the outer wall of the movable block (813). A second spur gear (814) is rotatably connected to the interior of the mounting base (711) located on the outer wall of the movable block (813). A reinforcing block (815) is slidably connected to the interior of the mounting base (711) located on the outer wall of the second spur gear (814). The reinforcing block (815) extends out of the mounting base (711).

5. The MPP pipe extrusion die assembly with quick die change capability according to claim 2, characterized in that, The outer wall of the connecting rod (701) is in contact with the inner wall of the connecting groove (704), the inner wall of the positioning groove (702) is in contact with the outer wall of one end of the positioning plate (705), and the outer wall of the guide rod (707) is in contact with the inner wall of the guide groove (706).

6. The MPP pipe extrusion die assembly with quick die change capability according to claim 2, characterized in that, The outer wall of the insertion rod (710) fits against the inner wall of the slot (712), the outer wall of the insertion rod (710) is provided with ratchet teeth, and one end of the locking block (713) engages with the ratchet teeth.

7. The MPP pipe extrusion die assembly with quick die change capability according to claim 4, characterized in that, The inner wall of the docking groove (802) is in contact with the outer wall of the docking rod (804).

8. The MPP pipe extrusion die assembly with quick die change capability according to claim 4, characterized in that, The outer wall of the rotating ring (805) is provided with a toothed groove, which meshes with the first spur gear (806).

9. The MPP pipe extrusion die assembly with quick die change capability according to claim 4, characterized in that, The outer wall of the rotating plate (809) is provided with a first threaded hole, which matches the first threaded rod (807). The outer wall of the rotating plate (809) is in contact with the inner wall of the displacement groove (808).

10. The MPP pipe extrusion die assembly with quick die change capability according to claim 4, characterized in that, The outer walls of the movable block (813) and the reinforcing block (815) are provided with gear teeth, which mesh with the second spur gear (814). The inner wall of the rotating ring (805) is provided with a slot, and one end of the reinforcing block (815) is engaged with the slot. The outer wall of the movable block (813) is provided with a second threaded hole, which matches the second threaded rod (812).

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