A high-strength and high-toughness MPP power pipe and its processing device

Abstract

This invention relates to the field of power pipe processing, and discloses a high-strength, high-toughness MPP power pipe and its processing device. The device includes a frame with U-shaped support blocks on both sides. Two guide rods are symmetrically fixed between the two U-shaped support blocks. A lead screw is parallel to one side of each guide rod and rotatably mounted between the two U-shaped support blocks. A handwheel is fixed to one end of the lead screw. A locking mechanism is provided on the frame to clamp the adjacent ends of two power pipe sections. A welding mechanism is provided in the middle of the frame to heat and weld the ends of the two power pipe sections. This invention, through the cooperation of a sliding groove and a slider, allows for the addition of an inner pad to the inside of the clamp, thereby selecting an inner diameter size of the pad that suits the outer diameter of the power pipe, achieving the purpose of locking power pipes of different specifications.

Description

Technical Field

[0001] This invention relates to the field of power pipe processing, specifically to a high-strength, high-toughness MPP power pipe and its processing apparatus. Background Technology

[0002] MPP power conduits, also known as MPP power cable protection pipes or MPP cable protection pipes, are mainly divided into open-cut and trenchless types. Trenchless MPP pipes are also called MPP jacking pipes or drag pipes. In special road sections, such as highways, railways, buildings, and riverbeds, MPP power conduits can be laid without extensive dredging and excavation that damages the road surface. This greatly reduces the dust and traffic congestion caused by traditional construction methods, making the technology more environmentally friendly.

[0003] In the current processing of MPP power pipes, it is often necessary to weld two sections of power pipe together. However, since the end face of the power pipe cannot be guaranteed to be flat, it will affect the subsequent welding quality. Therefore, it is usually necessary to first use end face cutting equipment to process the end face to ensure that the end face is flat, then place it in a heating plate to heat the end face of the power pipe, and then perform extrusion welding of the two end faces of the power pipe. Each time the end face processing, heating plate heating and welding process is performed, the two power pipes need to be connected repeatedly, resulting in too many welding operations, long time consumption and low efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide a high-strength and high-toughness MPP power pipe and its processing device, thereby solving the above-mentioned technical problems.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] A high-strength, high-toughness MPP power pipe, comprising an inner tube and an outer tube; the manufacturing method is as follows:

[0007] Step 1: Pour the following by weight: 80-100 parts MPP; 25-40 parts CaCO3; 9-12 parts plasticizer; 2.2-3.6 parts stabilizer; 6-10 parts compatibilizer; 6-8 parts lubricant; 5.5-7.5 parts CPE resin; 1-3 parts cerium citrate; 2.5-6 parts zinc glycerol; 2.5-6 parts stearic acid; 6.8-8 parts acrylate; 0.5-1.0 parts antioxidant; 0.3-0.5 parts titanium dioxide; 10-25 parts flame retardant; 10-15 parts deionized water; into a mixer and mix for 15-20 minutes to obtain a mixture. The flame retardant is one of decabromodiphenyl ethane, octabromoether, octabromoS ether, or bromotriazine.

[0008] Step 2: The mixture obtained in Step 1 is fed into an extruder for plasticization and granulation to obtain modified MPP masterbatch;

[0009] Step 3: Using the MPP masterbatch obtained in Step 2 as raw material, feed it into an extrusion molding machine to prepare the inner tube;

[0010] Step 4: The inner tubes obtained in multiple steps 3 are welded together by a processing device to obtain an extended inner tube; wherein, the two sections of inner tubes to be welded are fixed by the clamps of the processing device, and the end faces of the two sections of inner tubes are heated by the heating plate in the welding mechanism. The flatness of the end faces determines whether to start the flattening component to perform the flattening operation, so as to achieve the action of selectively flattening the end faces.

[0011] Step 5: Add the rubber material into the hopper of the extrusion coating machine, and finally form a coating layer on the surface of the extended inner tube as the outer tube to obtain the power tube.

[0012] As a further technical solution, the plasticizer is dioctyl phthalate, the stabilizer is a lead salt stabilizer, the lubricant is oxidized polyethylene wax, the compatibilizer is maleic anhydride-grafted polypropylene, and the antioxidant is antioxidant 264 or antioxidant 1076.

[0013] A processing device for high-strength and high-toughness MPP power pipes includes a frame, U-shaped support blocks are arranged on both sides of the frame, two optical rods are symmetrically fixed between the two U-shaped support blocks, a lead screw is arranged parallel to one side of one of the optical rods, the lead screw is rotatably installed between the two U-shaped support blocks, and a handwheel is fixed to one end of the lead screw.

[0014] The frame is equipped with a locking mechanism for clamping the close ends of the two power pipes. A welding mechanism is provided in the middle of the frame for heating and welding the ends of the two power pipes.

[0015] By utilizing the above technical solutions, the locking and welding mechanisms eliminate the need for manual adjustments to the end faces and the multiple operations of heating and welding, thus improving the continuity of the operation. Compared to multiple individual units that are set up separately, integrated installation facilitates the overall transportation and movement, and also prevents loss.

[0016] As a further technical solution, the locking mechanism includes:

[0017] The mounting base is provided in two parts, one of which is sleeved on the lead screw and guide rod, and the other mounting base is fixed to the frame.

[0018] The mounting base has bolt holes at both ends and a semi-circular clamp on it. The clamp has through slots at both ends, which correspond one-to-one with the bolt holes. The clamp and the mounting base are detachably fixed by fastening bolts. Two sliding grooves are provided on the inner side of the clamp, which are symmetrically distributed. A slider is slidably connected in the sliding groove and fixedly mounted on an inner pad. The inner diameter of the inner pad matches the outer diameter of the power conduit.

[0019] The above technical solution provides a locking mechanism that can lock power pipes of different diameters.

[0020] As a further technical solution, the welding mechanism includes:

[0021] A heating frame has a circular groove in the middle, and a heating plate is embedded in the circular groove. One end of the heating frame is sleeved on one of the light rods, and the other end is provided with a platform, which rests on the other light rod.

[0022] The heating rack is equipped with a handle on top and protective plates are movably installed on both sides of the heating rack. A cutting and flattening component is provided on the protective plate. The cutting and flattening component pops out and performs a cutting and flattening action when the end face of the power pipe is rough.

[0023] The above technical solution provides a specific structure for a welding mechanism that achieves the dual functions of cutting the ends of two power pipes flat and heating and welding them.

[0024] As a further technical solution, the cutting component includes:

[0025] A rotating shaft passes through the top of the two guard plates, a driving component is fixed to one end of the rotating shaft, and gears are fixedly connected to both sides of the rotating shaft;

[0026] A ring gear is movably mounted on the side of the guard plate and meshes with the gear. A cutter is fixed on the side of the ring gear away from the guard plate.

[0027] As a further technical solution, the protective plate has an annular groove, and a knife-holding groove is provided on the outer side of the annular groove. The depth of the knife-holding groove is less than the depth of the annular groove. A pushing element is provided at the bottom of the annular groove, and the pushing element contacts the side of the annular gear ring. The outer diameter of the annular gear ring on one side located in the annular groove is larger than that on the other side.

[0028] As a further technical solution, the pushing element is an electric push rod, the bottom end of which is fixed to the bottom end of the annular groove, and the telescopic end of the electric push rod contacts the annular gear ring.

[0029] As a further technical solution, each of the annular grooves is provided with at least two circumferentially distributed pushing elements.

[0030] As a further technical solution, the driving component is a handle, and a rubber sleeve is provided on the handle.

[0031] The beneficial effects of this invention are:

[0032] This invention utilizes the cooperation of a sliding groove and a sliding block to add an inner pad to the inside of the clamp, thereby selecting an inner diameter size of the pad that is suitable for the outer diameter of the power pipe, achieving the purpose of locking power pipes of different specifications. After aligning the through grooves on both sides of the clamp with the two bolt holes on the mounting base, tighten the fastening bolts downwards until the clamp locks the power pipe. Elastic pads can be placed on the inner pad and the inner side of the clamp to reduce scratches caused by direct contact with the outer surface of the power pipe.

[0033] This invention involves a worker gripping a handle and rotating a heating frame. The platform at one end of the heating frame rests on a bare rod on the other side, providing support for the heating frame. The heating frame is positioned between two power pipes. The heating plate inside the frame is activated. Protective plates on both sides protect the heating plate, preventing accidental contact and injury to workers and enhancing safety. Furthermore, the protective plates create an insulating environment for the heating plate, increasing its preheating speed. After preheating, the protective plates are removed, exposing the heating plate. The ends of the two power pipes press against the heating plate. After the required heating time, the power pipes are separated from the heating plate. The protective plates are then returned to their initial position, and the heating frame is swung away, pushing the two sections of power pipes together and allowing them to cool gradually, completing the welding process of the power pipes.

[0034] This invention uses the telescopic movement of the annular gear ring and the cutter to freely switch the meshing state with the gear, adapting to whether the end face of the power pipe needs to be leveled. In the non-working state, the cutter and the annular gear ring are hidden to prevent damage caused by accidental contact; in the working state, they are extended in time to perform normal work. Attached Figure Description

[0035] The invention will now be further described with reference to the accompanying drawings.

[0036] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0037] Figure 2 This is a schematic diagram of the fixture in this invention;

[0038] Figure 3 This is a three-dimensional structural schematic diagram of the welding mechanism in this invention;

[0039] Figure 4This is an exploded view of the welding mechanism in this invention;

[0040] Figure 5 This is a schematic diagram of the structure of the annular toothed ring and the annular toothed groove in this invention.

[0041] Figure Descriptions: 1. Frame; 2. U-shaped support block; 3. Guide rod; 4. Lead screw; 5. Handwheel; 6. Locking mechanism; 61. Mounting base; 62. Bolt hole; 63. Clamp; 64. Through groove; 65. Fastening bolt; 66. Slide groove; 67. Slider; 68. Inner pad plate; 7. Welding mechanism; 71. Heating frame; 72. Circular groove; 73. Heating plate; 74. Platform; 75. Handle; 76. Guard plate; 77. Cutting assembly; 771. Rotating shaft; 772. Drive component; 773. Gear; 774. Annular gear ring; 775. Cutter; 776. Annular groove; 777. Cutter slot; 778. Pushing element. Detailed Implementation

[0042] 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.

[0043] Please see Figure 1-5 As shown, the present invention is a processing device for high-strength and high-toughness MPP power pipes, including a frame 1, U-shaped support blocks 2 are arranged on both sides of the frame 1, and two optical rods 3 are symmetrically fixed between the two U-shaped support blocks 2. A lead screw 4 is arranged parallel to one side of one of the optical rods 3. The lead screw 4 is rotatably installed between the two U-shaped support blocks 2, and a handwheel 5 is fixed to one end of the lead screw 4.

[0044] The frame 1 is provided with a locking mechanism 6, which is used to clamp the ends of the two power pipes that are close to each other. The frame 1 is provided with a welding mechanism 7 in the middle, which is used to heat and weld the ends of the two power pipes.

[0045] The locking mechanism 6 includes:

[0046] Mounting base 61, two mounting bases 61 are provided, one mounting base 61 is sleeved on the lead screw 4 and the guide rod 3, and the other mounting base 61 is fixed on the frame 1; the U-shaped support block 2 is fixedly mounted on the mounting base 61;

[0047] The mounting base 61 has bolt holes 62 at both ends. A semi-circular clamp 63 is provided on the mounting base 61. Through grooves 64 are provided at both ends of the clamp 63. The through grooves 64 correspond one-to-one with the bolt holes 62. The clamp 63 and the mounting base 61 are detachably fixed by fastening bolts 65. Two sliding grooves 66 are provided on the inner side of the clamp 63. The two sliding grooves 66 are symmetrically distributed on the inner side of the clamp 63. A slider 67 is slidably connected in the sliding grooves 66. The slider 67 is fixedly set on the inner pad 68. The inner diameter of the inner pad 68 matches the outer diameter of the power pipe.

[0048] In this embodiment, a specific structure of an MPP power pipe processing device is provided. Specifically, the frame 1 is placed horizontally on the ground, and two power pipe sections are placed on two U-shaped support blocks 2 respectively. Then, two clamps 63 are fixed to their respective mounting seats 61 by fastening bolts 65. At this time, the ends of the two power pipe sections can be locked. In order to adapt to power pipes of different diameters, the present invention can add an inner pad 68 to the inside of the clamp 63 through the cooperation of the sliding groove 66 and the slider 67, so as to select the inner diameter size of the inner pad 68 that is suitable for the outer diameter of the power pipe, thereby achieving the purpose of locking power pipes of different specifications. After aligning the through grooves 64 on both sides of the clamp 63 with the two bolt holes 62 on the mounting seat 61, the fastening bolts 65 are tightened downwards until the clamp 63 locks the power pipe. Elastic pads can be placed on the inner pad 68 and the inner side of the clamp 63 to reduce scratches caused by direct contact with the outer surface of the power pipe.

[0049] After the two clamps 63 fix the two ends of the power pipe, the worker rotates the handwheel 5, which drives the lead screw 4 to rotate. The lead screw 4 slider 67 drives one of the mounting seats 61 and the clamped power pipe to move and remain stationary. Then, the welding mechanism 7 is used to weld the two power pipes together, thus completing the connection processing of the power pipe.

[0050] The welding mechanism 7 includes:

[0051] A heating frame 71 has a circular groove 72 in the middle, and a heating plate 73 is embedded in the circular groove 72. One end of the heating frame 71 is sleeved on one of the light rods 3, and the other end is provided with a platform 74, which rests on the other light rod 3.

[0052] The heating rack 71 is provided with a handle 75 on the top, and protective plates 76 are movably installed on both sides of the heating rack 71. A cutting and flattening component 77 is provided on the protective plate 76. The cutting and flattening component 77 pops out and performs a cutting and flattening action when the end face of the power pipe is rough.

[0053] The above technical solution provides a specific structure for the welding mechanism 7, enabling the flattening and heating of the power pipe end face, eliminating multiple manual operations and improving welding efficiency. Specifically, during use, the worker grasps the handle 75 and rotates the heating frame 71. The platform 74 at the other end of the heating frame 71 rests precisely on the smooth rod 3 on the other side, providing support for the heating frame 71. The heating frame 71 is located between the two power pipes. The heating plate 73 inside the heating frame 71 is activated. Because protective plates 76 are provided on both sides, the heating plate 73 is protected. The protective plates 76 on both sides prevent the heating plate 73 from being exposed on both sides, which could lead to worker injury from accidental contact and enhance safety. On the other hand, the protective plates 76 on both sides can create an insulating environment for the heating plate 73 and improve the preheating speed of the heating plate 73. After preheating, the two protective plates 76 are pulled out to expose the heating plate 73. The two power pipe ends are pressed against the heating plate. After the heating time is reached, the power pipes are separated from the heating plate. The protective plates 76 are then pushed back to their initial state. The heating frame 71 is then swung away to push the two power pipes together and gradually cool them down, thus completing the welding process of the power pipes.

[0054] When one of the power pipes is displaced, observe whether the end face of the power pipe is flat. If it is not flat, the protective plate 76 remains stationary, and the ends of the two power pipes are pressed tightly against the protective plate 76. The cutting and flattening component 77 on the protective plate 76 is then used to cut the end face of the power pipe to achieve the purpose of flattening the end face. During the cutting and flattening process, the heating plate 73 can be activated for preheating, thereby saving time. This invention integrates the cutting and heating of the power pipe into an integrated structure, and can perform the cutting and flattening action when needed, and use the cutting and flattening time to preheat the heating plate, saving time. When cutting and flattening is not needed, the protective plate 76 can be removed to carry out the normal heating process, saving time and effort. The process of removing the protective plate 76 is as follows: a transverse sliding groove is provided on the heating frame 71, and a sliding shaft is fixed on the side of the protective plate 76 facing the transverse sliding groove. Manually pushing the protective plate 76 causes the sliding shaft to slide in the transverse sliding groove, thereby removing the protective plate 76 to expose the heating plate 73.

[0055] The flattening component 77 includes:

[0056] A rotating shaft 771 passes through the top of the two guard plates 76. A driving component 772 is fixed to one end of the rotating shaft 771, and gears 773 are fixedly connected to both sides of the rotating shaft 771.

[0057] A ring gear 774 is movably mounted on the side of the guard plate 76 and meshes with the gear 773. A cutter 775 is fixed on the side of the ring gear 774 away from the guard plate 76.

[0058] The protective plate 76 has an annular groove 776, and a knife-holding groove 777 is provided on the outer side of the annular groove 776. The depth of the knife-holding groove 777 is less than the depth of the annular groove 776. A pushing element 778 is provided at the bottom of the annular groove 776, and the pushing element 778 contacts the side of the annular gear ring 774. The outer diameter of the annular gear ring 774 located in the annular groove is larger on one side than on the other side. The pushing element 778 is an electric push rod, the bottom end of which is fixed to the bottom end of the annular groove 776, and the telescopic end of the electric push rod contacts the annular gear ring 774.

[0059] Each of the annular grooves 776 is provided with at least two circumferentially distributed pushing elements 778. The driving element 772 is a handle, and a rubber sleeve is provided on the handle.

[0060] The above technical solution provides a specific structure for a flattening assembly 77. Specifically, to reduce the risk of the cutter 775 being exposed, the present invention provides an annular groove 776 and a pushing element 778. The pushing element 778 is an electric push rod. When the gear 773 moves towards the annular gear ring 774, the pushing element 778 is activated, pushing the annular gear ring 774 out of the annular groove 776. Since the annular gear ring 774 and the annular groove 776 are configured in a T-shape, the annular gear ring 774 can slide within the annular groove. However, it cannot disengage from the annular groove 776. The gear 773 and the annular gear ring 774 are in a meshing state, and the cutter 775 also extends out from the blade slot 777. When a flat cutting operation is required, the drive component 772 above the heating frame 71 is rotated. The drive component 772 can be a handle or a motor. The drive component 772 drives the rotating shaft 771 to rotate. The gear 773 can rotate with the rotating shaft 771, driving the annular gear ring 774 to rotate circumferentially. As the cutter 775 on the annular gear ring 774 rotates, the trimming action on the end face of the power tube is completed.

[0061] This invention uses the telescopic movement of the annular gear ring 774 and the cutter 775 to freely switch the meshing state with the gear 773, adapting to whether the end face of the power tube needs to be leveled. In the non-working state, the cutter 775 and the annular gear ring 774 are hidden to prevent damage caused by accidental contact; in the working state, they are extended in time to perform normal work.

[0062] A high-strength, high-toughness MPP power pipe, comprising an inner tube and an outer tube; the manufacturing method is as follows:

[0063] Step 1: Pour the following components by weight: 100 parts MPP; 25 parts CaCO3; 9 parts plasticizer; 2.2 parts stabilizer; 6 parts compatibilizer; 6 parts lubricant; 5.8 parts CPE resin; 1.2 parts cerium citrate; 2.5 parts zinc glycerol; 3.5 parts stearic acid; 7.5 parts acrylate; 0.6 parts antioxidant; 0.4 parts titanium dioxide; 15 parts flame retardant; and 12 parts deionized water into a mixer and mix for 15-20 minutes to obtain a mixture. The flame retardant is one of decabromodiphenyl ethane, octabromoether, octabromoS ether, or bromotriazine. The plasticizer is dioctyl phthalate; the stabilizer is a lead salt stabilizer; the lubricant is oxidized polyethylene wax; the compatibilizer is maleic anhydride-grafted polypropylene; and the antioxidant is antioxidant 264 or antioxidant 1076.

[0064] Step 2: The mixture obtained in Step 1 is fed into an extruder for plasticization and granulation to obtain modified MPP masterbatch;

[0065] Step 3: Using the MPP masterbatch obtained in Step 2 as raw material, feed it into an extrusion molding machine to prepare the inner tube;

[0066] Step 4: The inner tubes obtained in multiple steps 3 are welded together by a processing device to obtain an extended inner tube; wherein, the two sections of inner tubes to be welded are fixed by the clamps of the processing device, and the end faces of the two sections of inner tubes are heated by the heating plate in the welding mechanism 7. The flatness of the end faces determines whether to start the flattening component 77 to perform the flattening operation, so as to achieve the action of selectively flattening the end faces.

[0067] Step 5: Add the rubber material into the hopper of the extrusion coating machine, and finally form a coating layer on the surface of the extended inner tube as the outer tube to obtain the power tube.

[0068] Working principle of the invention:

[0069] Place the frame 1 horizontally on the ground, and then place the two sections of power pipe on the two U-shaped support blocks 2 respectively. Then, fix the two clamps 63 to their respective mounting bases 61 in sequence with fastening bolts 65. At this time, the ends of the two sections of power pipe can be locked. In order to adapt to power pipes of different diameters, the present invention can add an inner pad 68 to the inside of the clamp 63 through the cooperation of the sliding groove 66 and the slider 67, so as to select the inner diameter size of the inner pad 68 that is suitable for the outer diameter of the power pipe, thereby achieving the purpose of locking power pipes of different specifications. After aligning the through grooves 64 on both sides of the clamp 63 with the two bolt holes 62 on the mounting base 61, tighten the fastening bolts 65 downwards until the clamp 63 locks the power pipe. Elastic pads can be placed on the inner pad 68 and the inner side of the clamp 63 to reduce scratches caused by direct contact with the outer surface of the power pipe.

[0070] After the two clamps 63 fix the two ends of the power pipe, the worker rotates the handwheel 5, which drives the lead screw 4 to rotate. The lead screw 4 slider 67 drives one of the mounting seats 61 and the clamped power pipe to move and remain stationary. Then, the welding mechanism 7 is used to weld the two power pipes together, thus completing the connection process of the power pipe.

[0071] Specifically, during use, the worker grasps the handle 75 and rotates the heating frame 71. The platform 74 at the other end of the heating frame 71 rests on the bare rod 3 on the other side, providing support for the heating frame 71. The heating frame 71 is located between the two power pipes. The heating plate 73 inside the heating frame 71 is activated. Due to the protective plates 76 on both sides, the heating plate 73 is protected. On the one hand, this prevents the two sides of the heating plate 73 from being exposed and causing injury if the worker accidentally touches it, thus enhancing safety. On the other hand, the protective plates 76 on both sides can create an insulating environment for the heating plate 73, improving the preheating speed of the heating plate 73. After preheating, the two protective plates 76 are pulled out, exposing the heating plate 73. The ends of the two power pipes are pressed against the heating plate 73. After the heating time is reached, the power pipes are separated from the heating plate, the protective plates 76 are pushed back to their initial state, and the heating frame 71 is swung away to push the two sections of power pipes together and gradually cool down, completing the welding process of the power pipes.

[0072] When one of the power pipes is displaced, observe whether the end face of the power pipe is flat. If it is not flat, the protective plate 76 remains stationary, and the ends of the two power pipes are pressed tightly against the protective plate 76. The cutting and flattening component 77 on the protective plate 76 is then used to cut the end face of the power pipe to achieve the purpose of flattening the end face. During the cutting and flattening process, the heating plate 73 can be activated for preheating, thereby saving time. This invention integrates the cutting and heating of the power pipe into an integrated structure, and can perform the cutting and flattening action when it is needed, and use the cutting and flattening time to preheat the heating plate, saving time. When cutting and flattening is not needed, the protective plate 76 can be removed to carry out the normal heating process, saving time and effort.

[0073] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A processing apparatus for processing high-strength and high-toughness MPP power pipes, characterized in that, The high-strength, high-toughness MPP power pipe includes an inner tube and an outer tube, and the preparation method of the high-strength, high-toughness MPP power pipe is as follows: Step 1: Pour the following ingredients by weight: 80-100 parts MPP; 25-40 parts CaCO3; 9-12 parts plasticizer; 2.2-3.6 parts stabilizer; 6-10 parts compatibilizer; 6-8 parts lubricant; 5.5-7.5 parts CPE resin; 1-3 parts cerium citrate; 2.5-6 parts zinc glycerol; 2.5-6 parts stearic acid; 6.8-8 parts acrylate; 0.5-1.0 parts antioxidant; 0.3-0.5 parts titanium dioxide; 10-25 parts flame retardant; and 10-15 parts deionized water into a mixer and mix for 15-20 minutes to obtain a mixture. The plasticizer is dioctyl phthalate, the stabilizer is a lead salt stabilizer, the lubricant is oxidized polyethylene wax, the compatibilizer is maleic anhydride-grafted polypropylene, and the antioxidant is antioxidant 264 or antioxidant 1076. Step 2: The mixture obtained in Step 1 is fed into an extruder for plasticization and granulation to obtain modified MPP masterbatch; Step 3: Using the MPP masterbatch obtained in Step 2 as raw material, feed it into an extrusion molding machine to prepare the inner tube; Step 4: The inner tubes obtained in Step 3 are welded together by a processing device to obtain an extended inner tube; wherein, the two sections of inner tubes to be welded are fixed by the clamp of the processing device, and the end faces of the two sections of inner tubes are heated by the heating plate (73) in the welding mechanism (7). At the same time, the flatness of the end face is used to determine whether to start the flattening component (77) to perform the flattening operation, so as to achieve the action of selectively flattening the end face; Step 5: Add the rubber material into the hopper of the extrusion coating machine, and finally form a coating layer on the surface of the extended inner tube as the outer tube to obtain the power pipe; The processing device includes a frame (1), with U-shaped support blocks (2) on both sides of the frame (1), and two optical rods (3) symmetrically fixed between the two U-shaped support blocks (2). A lead screw (4) is arranged parallel to one side of one of the optical rods (3). The lead screw (4) is rotatably installed between the two U-shaped support blocks (2), and a handwheel (5) is fixed to one end of the lead screw (4). The frame (1) is provided with a locking mechanism (6), which is used to clamp the ends of the two power pipes that are close to each other. The frame (1) is provided with a welding mechanism (7), which is used to heat and weld the ends of the two power pipes. The welding mechanism (7) includes: A heating rack (71) is provided with a circular groove (72) in the middle, and a heating plate (73) is embedded in the circular groove (72). One end of the heating rack (71) is sleeved on one of the light rods (3), and the other end is provided with a platform (74), and the platform (74) rests on the other light rod (3). The heating rack (71) is provided with a handle (75) on the top, and the heating rack (71) is movably installed with guard plates (76) on both sides. The guard plates (76) are provided with a cutting component (77). The cutting component (77) pops out and performs a cutting action when the end face of the power pipe is rough. The locking mechanism (6) includes: Mounting base (61), two mounting bases (61) are provided, one mounting base (61) is sleeved on the lead screw (4) and the guide rod (3), and the other mounting base (61) is fixed on the frame (1); the U-shaped support block (2) is fixedly set on the mounting base (61); The mounting base (61) has bolt holes (62) at both ends. A semi-circular clamp (63) is provided on the mounting base (61). Through slots (64) are provided at both ends of the clamp (63). The through slots (64) correspond one-to-one with the bolt holes (62). The clamp (63) and the mounting base (61) are detachably fixed by fastening bolts (65). Two sliding grooves (66) are provided on the inner side of the clamp (63). The two sliding grooves (66) are symmetrically distributed on the inner side of the clamp (63). A slider (67) is slidably connected in the sliding groove (66). The slider (67) is fixedly set on the inner pad (68). The inner diameter of the inner pad (68) matches the outer diameter of the power pipe. The flattening assembly (77) includes: A rotating shaft (771) passes through the top of the two guard plates (76), a driving component (772) is fixed to one end of the rotating shaft (771), and gears (773) are fixedly connected to both sides of the rotating shaft (771). A ring gear (774) is movably mounted on the side of the guard plate (76) and meshes with the gear (773). A cutter (775) is fixed on the side of the ring gear (774) away from the guard plate (76). The guard plate (76) has an annular groove (776) and a knife-holding groove (777) is provided on the outer side of the annular groove (776). The depth of the knife-holding groove (777) is less than the depth of the annular groove (776). A pushing element (778) is provided at the bottom of the annular groove (776). The pushing element (778) contacts the side of the annular toothed ring (774). The outer diameter of the annular toothed ring (774) located in the annular groove (776) is larger on one side than on the other side.

2. The processing apparatus for high-strength and high-toughness MPP power pipes according to claim 1, characterized in that, The pushing element (778) is an electric push rod, the bottom end of which is fixed to the bottom end of the annular groove (776), and the telescopic end of the electric push rod is in contact with the annular toothed ring (774).

3. The processing apparatus for high-strength and high-toughness MPP power pipes according to claim 1 or 2, characterized in that, Each of the annular grooves (776) is provided with at least two circumferentially distributed pushing elements (778).

4. The processing apparatus for high-strength and high-toughness MPP power pipes according to claim 1, characterized in that, The driving component (772) is a handle, and a rubber sleeve is fitted on the handle.

Images