Forming device for plastic pipe production and production line

Abstract

The invention relates to the technical field of pipe production, and discloses a forming device for plastic pipe production and a production line, the forming device for plastic pipe production comprises an extruder and further comprises a hot melting device fixedly connected to the outer portion of the extruder in a sleeving mode, and a flow dividing outer ring is located on the side, close to the extruder, of a filter screen; the pressure-bearing piece is connected between the inner mold and the storage pipe, the flow-dividing partition disc comprises an initial position, when the pressure-bearing piece does not move, the flow-dividing partition disc is located at the initial position, and when the pressure-bearing piece moves, the circulation path of the filter screen is changed through the flow-dividing partition disc and the flow-dividing outer ring. The filter screen is used for blocking and intercepting material particles which are not fully plasticized, so that the purity of materials entering the inner mold is ensured, a stable annular forming foundation is provided for the materials, the downtime of a production line is shortened, the stability of equipment operation parameters is maintained, the parameter debugging period caused by part replacement or blockage is shortened, and the production efficiency is improved. And the production efficiency under the peak production requirement is improved while the pipe forming quality is guaranteed.

Description

Technical Field

[0001] This invention relates to the technical field of pipe production, and in particular to a molding apparatus and production line for producing plastic pipes. Background Technology

[0002] The core components of a plastic pipe production molding device include an extruder, die head, flow divider cone, and shaping sleeve. The extruder is responsible for plasticizing and conveying the raw materials. The die head and flow divider cone work together to form the molten material into a ring-shaped flow. The shaping sleeve cools the pipe to solidify and shape it. The production line consists of a raw material conveying and mixing system, an extrusion molding system, a cooling and shaping system, a traction system, a cutting system, and a stacking system.

[0003] However, in existing technologies, during peak plastic pipe production periods, all components of the equipment need to operate continuously at high frequencies. Among them, the extruder, as the core equipment, undertakes the key tasks of raw material plasticization and transportation. Its core working principle is that through the segmented heating system outside the barrel, which is usually divided into feeding section, compression section, and homogenization section heating, combined with the rotation and extrusion of the internal screw, the material is gradually transformed from solid particles to molten melt. At the same time, the spiral structure of the screw propels the molten material to be stably transported towards the die head. Under this working condition, the screw usually has a service life of 2-3 years. However, after the first maintenance, due to the deviation in maintenance and assembly precision, damage to the surface wear layer, etc., it is very easy to be damaged during secondary use. From the working principle of pipe extrusion equipment, the screw of the plastic pipe extruder needs to rotate at high speed inside the barrel, forming a closed material transportation space with the inner wall of the barrel. The material is plasticized and propelled in the relative movement between the two. Long-term friction will cause the working surfaces of the screw and the barrel to gradually wear down - the screw diameter shrinks, the inner diameter of the barrel increases, and the gap between the two gradually widens. According to the conveying principle of extruders, the resistance of the die head and diverter cone at the front end of the barrel remains constant. However, an increase in the clearance between them can lead to backflow and leakage of the molten material. This means that some material flows back from the clearance towards the feed direction, reducing the effective conveying capacity and thus decreasing output. It also prolongs the residence time of the material in the barrel. If the raw material contains components such as polyvinyl chloride (PVC), prolonged high-temperature residence in the barrel will accelerate decomposition, and the resulting hydrogen chloride gas will exacerbate corrosion and wear on the screw and barrel. Especially during peak periods, medium-sized extruders can produce up to 3 tons per day. High-load operation further increases the stress and wear on the screw, and also affects the fitting accuracy of the die and sizing sleeve. From a practical production perspective, medium-sized... Due to the storage characteristics of plastic pipes and the need to match customer order delivery cycles, companies cannot stockpile large quantities of goods in advance. During peak demand, they can only operate the equipment continuously under overload, which further aggravates screw damage and leads to frequent downtime for maintenance and replacement. During peak periods, screw maintenance and replacement can take several days of disassembly and installation time. Moreover, according to the forming principle of pipe extrusion, after screw replacement, key parameters such as the concentricity of the sizing sleeve and the die head, the matching of the center height of the traction equipment and the die head, and the coordination of the cooling water flow rate of the sizing sleeve and the material output speed of the die head all need to be readjusted and optimized. These parameters directly determine the core quality indicators of the pipe, such as wall thickness uniformity and roundness. The debugging process often requires several days of production verification, which seriously affects production efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide a molding device and production line for producing plastic pipes, thereby solving the problem of insufficient production efficiency in pipe extrusion molding.

[0005] This invention provides a molding apparatus for producing plastic pipes, including an extruder, a hot melt assembly fixedly sleeved outside the extruder, an outer mold tube fixedly connected to one end of the hot melt assembly, an inner mold disposed inside the outer mold tube, a filter screen fixedly connected inside the outer mold tube, a flow divider and a flow divider outer ring slidably connected inside the outer mold tube, a receiving tube fixedly connected below the outer mold tube, and a pressure-bearing component disposed inside the outer mold tube. One end of the inner mold is fixedly connected to the filter screen, the flow divider is located on one side of the filter screen, the flow divider outer ring is located on the side of the filter screen closer to the extruder, and the pressure-bearing component is connected between the inner mold and the receiving tube. The flow divider includes an initial position; when the pressure-bearing component is not moved, the flow divider is in the initial position; when the pressure-bearing component moves, the flow path of the filter screen is changed through the flow divider and the flow divider outer ring.

[0006] Furthermore, the filter screen is provided with filter holes, which are divided into inner ring filter holes and outer ring filter holes. The number of inner ring filter holes and outer ring filter holes is equal. The outer mold tube is provided with a tapered section inside, and the diameter of the tapered section gradually decreases as it moves away from the filter screen.

[0007] Furthermore, the diversion baffle includes a disc slidably connected inside the outer mold tube, an arc strip fixedly connected to the disc, a round shaft fixedly connected to the arc strip, and a strip block fixedly connected to the bottom of the round shaft.

[0008] Furthermore, the disc has multiple spacers on the side near the filter screen, the disc has through slots, the arc strips penetrate the middle of the filter screen, and the strips have oblique slots. When the disc is in the initial position, the spacers do not contact the filter screen.

[0009] Furthermore, the diversion outer ring includes a circular ring slidably connected inside the outer mold tube, a circular sleeve fixedly connected to the circular ring, and a return spring connected between the circular ring and the outer mold tube. The circular ring is provided with multiple sealing shafts on the side near the filter screen. The number of sealing shafts, inner ring filter holes, and through slots are equal. The positions of the through slots correspond one-to-one with the inner ring filter holes, and the positions of the sealing shafts correspond one-to-one with the outer ring filter holes.

[0010] Furthermore, a magnetic ring is provided on the side of the ring near the filter screen, and a horizontal groove is opened at the bottom of the sleeve. The magnetic force when the magnetic ring is attracted to the filter screen is greater than the elastic coefficient of the return spring. When the disc is in the initial position, the sealing shaft is located inside the outer ring filter hole.

[0011] Furthermore, the strip passes through the magnetic ring, and when the disk is in the initial position, the distance between the circular shaft and the circular sleeve is less than the horizontal length of the inclined slot, and this distance is greater than the distance between the spacer shaft and one side of the filter screen.

[0012] Furthermore, the pressure-bearing component includes a sliding plate slidably connected inside the receiving tube, a return spring connected between the sliding plate and the receiving tube, a vertical rod fixedly connected to the top of the sliding plate, and a rotating shaft fixedly connected to the top of the vertical rod. The rotating shaft is located inside the inclined slot, and the spring force coefficient of the return spring is greater than that of the reset spring.

[0013] Furthermore, a motor is fixedly connected to the end of the extruder away from the outer mold tube, a bottom box is provided at the bottom of the extruder, and a material port is provided at the top of the hot melter near the motor.

[0014] On the other hand, a molding production line for producing plastic pipes is provided, which includes a molding device for producing plastic pipes, as well as raw material processing equipment, cooling and shaping equipment, traction system and cutting and storage equipment.

[0015] The beneficial effects of this invention are: By filtering and intercepting insufficiently plasticized material particles, the purity of the material entering the inner mold is ensured, providing a stable foundation for the ring-shaped forming of the material. Combined with the precise sensing and sequential transmission of pressure components, the flow divider and the outer flow ring are driven to complete adjustment, processing, and resetting. In conjunction with the centralized storage of the collection tube and the forming of the inner mold, the impact and wear on the extruder screw are effectively reduced, extending the screw's service life and solving the problem of frequent screw damage during peak periods. Furthermore, the online separation and storage of impurities reduces the frequency of replacement of core components during peak periods, reduces production line downtime, maintains the stability of equipment operating parameters, and reduces parameter adjustment cycles caused by component replacement or blockage. This ensures the quality of pipe forming while improving production efficiency under peak production demands.

[0016] By coordinating pressure-bearing components and diverting baffles, the cleaning of impurities is automated and can be completed without manual intervention. The entire process cycle can be triggered without manual intervention. First, the inner ring filter holes are cleaned of impurities by the baffle shaft, and then the impurities are guided to the collection pipe by the outer diverting ring. At the same time, the flow path is expanded to relieve pressure. The material conveying is uninterrupted throughout the process, reducing the number of downtime maintenance during peak periods and avoiding damage to the extruder screw caused by sudden load increases. This not only increases the unit time production capacity, but also effectively reduces the impact and wear on the screw rod. By separating and processing unsuitable materials, the replacement of parts during peak production periods is reduced, which helps to reduce production line downtime and extend the service life of the screw rod to meet peak production demands.

[0017] By separating the filter screen from the extruder output, a larger amount of fragmented material can be stored and separated. The material is then stored in a collection tube, retaining reusable material. By reusing this material, resources can be saved and the demand for new raw materials can be reduced. This reduces wear and material waste, avoids stagnation, reduces the risk of equipment blockage, improves the continuity and reliability of production, and ensures that coarse material does not continue to remain inside the extruder, thus achieving complete separation of coarse material. Attached Figure Description

[0018] Figure 1 A first-person perspective three-dimensional structural diagram of the molding equipment; Figure 2 This is a schematic diagram of the outer mold tube of the molding equipment; Figure 3 This is a top view of the outer mold tube of the molding equipment; Figure 4 For molding equipment Figure 3 Sectional view at point AA; Figure 5 A schematic diagram of the outer ring structure of the molding equipment; Figure 6 A schematic diagram of the flow divider plate of the molding equipment; Figure 7 This is a schematic diagram of the structure of the filter screen in the forming equipment; Figure 8 This is a schematic diagram of the ring structure of the molding equipment; Figure 9 This is a flowchart of the production line.

[0019] In the picture: 1. Extruder; 101. Motor; 102. Base box; 2. Hot melt machine; 21. Feed port; 3. Outer mold tube; 31. Conical section; 4. Inner mold; 5. Filter screen; 51. Filter hole; 501. Inner ring filter hole; 502. Outer ring filter hole; 6. Diverter plate; 61. Disc; 611. Spacer shaft; 62. Arc strip; 63. Round shaft; 64. Strip block; 641. Inclined slot; 601. Through slot; 7. Diverter outer ring; 71. Circular ring; 711. Sealing shaft; 712. Magnetic ring; 72. Circular sleeve; 721. Horizontal slot; 73. Return spring; 8. Receiving tube; 9. Pressure bearing component; 91. Slide plate; 92. Return spring; 93. Vertical rod; 94. Rotating shaft. Detailed Implementation

[0020] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0021] Example 1, refer to Figures 1-9This is the first embodiment of the present invention, which provides a molding apparatus for producing plastic pipes, including an extruder 1, a hot melt assembly 2 fixedly sleeved outside the extruder 1, an outer mold tube 3 fixedly connected to one end of the hot melt assembly 2, an inner mold 4 disposed inside the outer mold tube 3, a filter screen 5 fixedly connected inside the outer mold tube 3, a flow divider 6 and a flow divider outer ring 7 slidably connected inside the outer mold tube 3, a receiving tube 8 fixedly connected below the outer mold tube 3, and a pressure bearing member 9 disposed inside the outer mold tube 3. One end of the inner mold 4 is fixedly connected to the filter screen 5. The flow divider 6 is located on one side of the filter screen 5, and the flow divider outer ring 7 is located on the side of the filter screen 5 closer to the extruder 1. The pressure bearing member 9 is connected between the inner mold 4 and the receiving tube 8. The flow divider 6 has an initial position. When the pressure bearing member 9 is not moved, the flow divider 6 is located in the initial position. When the pressure bearing member 9 moves, the flow path of the filter screen 5 is changed through the flow divider 6 and the flow divider outer ring 7.

[0022] Specifically, the outer mold tube 3 provides a unified installation benchmark for other components, ensuring the concentricity of the inner mold 4, filter screen 5, flow divider 6, and flow divider outer ring 7 during operation. This avoids material flow disturbances caused by component assembly deviations and maintains pressure stability during material conveying. The filter screen 5 can block incompletely decomposed raw materials and intercept insufficiently plasticized material particles, preventing such hard impurities from entering subsequent mold forming. This ensures that the filtered pure material can enter the inner mold 4 more smoothly, providing a stable annular forming base for the material and ensuring the initial shape accuracy of the pipe forming. The flow divider 6 and flow divider outer ring 7 are both slidably connected inside the outer mold tube 3 and are located on both sides of the filter screen 5. Together, they form a dynamically adjustable material flow divider structure. When the equipment is operating normally and the pressure-bearing component 9 is not moved, the flow divider 6 is in its initial position. At this time, the material can be smoothly conveyed through the normal channel of the filter screen 5. When the material flow resistance increases due to the accumulation of impurities at the filter screen 5, the fused liquid raw materials will impact the pressure bearing component 9, causing the pressure bearing component 9 to move. The movement of the pressure bearing component 9 will first drive the flow divider 6 to move, which will process the filter screen 5 and clear the blockage area of ​​the filter screen 5. Then, the flow divider outer ring 7 will be triggered, and the accumulated impurities will be guided into the receiving pipe 8 by the flow divider outer ring 7, so as to avoid the continuous blockage of impurities causing a sudden increase in the load on the screw of the extruder 1. At the same time, the material flow path of the filter screen 5 will be changed, so that the filter screen 5 will be depressurized. This will cause the pressure bearing component 9 to drive the flow divider 6 and the flow divider outer ring 7 to reset. Thus, the continuity of material conveying is maintained by adjusting the path. The initial separation of impurities can be completed without stopping the machine, which effectively reduces the number of downtime maintenance caused by equipment blockage during peak periods and reduces the risk of damage to the screw caused by sudden load changes.

[0023] The pressure-bearing component 9 is connected between the inner mold 4 and the receiving pipe 8, thereby realizing material resistance sensing and triggering the diversion action to guide the collection of impurities. When the accumulation of impurities at the filter screen 5 causes the material pressure to rise, the liquid pressure will be transmitted to the pressure-bearing component 9 through the inner mold 4 due to the movement space of the pressure-bearing component 9, triggering the movement of the pressure-bearing component 9. At the same time, the movement of the pressure-bearing component 9 provides power to the diversion baffle 6. Only when the diversion baffle 6 is fully moved will the diversion outer ring 7 be triggered, ensuring the timeliness of the diversion component's action. At the same time, it can guide the separated impurities into the receiving pipe 8 smoothly during the diversion process, avoiding secondary blockage or component wear caused by the impurities scattering inside the equipment. This achieves the synergy of diversion and collection, improving the stability of equipment operation.

[0024] Reference Figures 2-8 The filter screen 5 has filter holes 51, which are divided into inner ring filter holes 501 and outer ring filter holes 502. The number of inner ring filter holes 501 and outer ring filter holes 502 is equal, thus forming different passages and ensuring that the material passes through the filter screen 5 evenly. This improves the filtration efficiency while ensuring the stability of the material flow. The outer mold tube 3 has a conical section 31 inside. The diameter of the conical section 31 gradually decreases as it moves away from the filter screen 5, guiding the filtered material to converge towards the center, further avoiding material flow disorder, and enhancing the uniform transmission of material pressure to maintain pressure stability during the material conveying process.

[0025] Specifically, there is a certain space between the filter screen 5 and the extruder 1, so that after the filter screen 5 blocks and intercepts the insufficiently plasticized material particles, the intercepted material will not be inside the extruder 1, reducing frictional damage to the screw.

[0026] Reference Figures 3-6 The diversion baffle 6 includes a disc 61 slidably connected inside the outer mold tube 3, an arc strip 62 fixedly connected to the disc 61, a round shaft 63 fixedly connected to the arc strip 62, and a strip 64 fixedly connected to the bottom of the round shaft 63. Multiple partition shafts 611 are provided on the side of the disc 61 near the filter screen 5. A through slot 601 is opened on the disc 61. The arc strip 62 passes through the middle of the filter screen 5. The strip 64 is provided with a slanted slot 641. When the disc 61 is in the initial position, the partition shafts 611 do not contact the filter screen 5.

[0027] Specifically, the disc 61 is slidably mounted inside the outer mold tube 3, allowing it to slide stably along the axial direction of the outer mold tube 3. Multiple spacers 611 are evenly distributed on the side near the filter screen 5. The spacers 611 are perpendicular to the end face of the disc 61. When the disc 61 is in its initial working position, none of the spacers 611 contact the filter screen 5, creating a gap between them. This allows fully dissolved material to pass through, while incompletely dissolved material is intercepted. The through slot 601 on the surface of the disc 61 is used for… To improve material throughput efficiency, one end of the arc strip 62 is fixedly connected to the disc 61, and the other end extends through the middle of the filter screen 5, avoiding problems such as offset or tilting during the sliding of the disc 61. At the same time, it enables the circular shaft 63 connected to the arc strip 62 to connect with the diversion outer ring 7. The bottom of the circular shaft 63 is fixedly connected to the strip 64, and the surface of the strip 64 is provided with a slanted groove 641. The top of the pressure bearing member 9 is located inside the slanted groove 641. When the pressure bearing member 9 moves, it will squeeze the inside of the slanted groove 641, causing the diversion partition 6 to move as a whole.

[0028] Reference Figures 1-3 The diversion outer ring 7 includes a circular ring 71 slidably connected inside the outer mold tube 3, a circular sleeve 72 fixedly connected to the circular ring 71, and a return spring 73 connected between the circular ring 71 and the outer mold tube 3. The side of the circular ring 71 near the filter screen 5 is provided with multiple sealing shafts 711. The number of sealing shafts 711, inner ring filter holes 501 and through slots 601 are equal. The positions of through slots 601 and inner ring filter holes 501 are one-to-one, and the positions of sealing shafts 711 and outer ring filter holes 502 are one-to-one, which can achieve precise and targeted treatment of the corresponding area of ​​the filter screen 5.

[0029] A magnetic ring 712 is provided on the side of the ring 71 near the filter screen 5. A horizontal slot 721 is opened at the bottom of the sleeve 72. When the magnetic ring 712 is attracted to the filter screen 5, the magnetic force is greater than the elastic coefficient of the return spring 73. When the magnetic ring 712 is attracted to the filter screen 5, the return spring 73 cannot pull the ring 71, which can ensure the stability of the diversion state. When the disc 61 is in the initial position, the sealing shaft 711 is located inside the outer ring filter hole 502, which closes the outer ring filter hole 502. At this time, the material can only flow through the through slot 601 and the inner ring filter hole 501, realizing stable flow control in the initial state. The ring 71 is used to push the particulate material inside the outer mold tube 3, while the spacer shaft 611 will enter the inner ring filter hole 501 after moving, and process the inner ring filter hole 501 to reduce blockage.

[0030] Reference Figures 1-3The strip 64 passes through the magnetic ring 712. When the disc 61 is in the initial position, the distance between the circular shaft 63 and the circular sleeve 72 is less than the horizontal length of the inclined slot 641, and this distance is greater than the distance between the spacer shaft 611 and one side of the filter screen 5. This allows the circular shaft 63 to fully move and squeeze the inside of the circular sleeve 72, causing the circular sleeve 72 to move under pressure, thereby separating the magnetic ring 712 from the filter screen 5, and causing the circular ring 71 to be pulled back to its original position by the stretched return spring 73.

[0031] Specifically, when the disc 61 is in its initial position, the distance between the circular shaft 63 and the circular sleeve 72 is designed to be less than the horizontal length of the inclined slot 641 and greater than the distance between the spacer 611 and one side of the filter screen 5. This dimensional difference controls the timing of the actions, ensuring that the cleaning action precedes the diversion action. That is, the spacer 611 first contacts and cleans the clogged area of ​​the filter screen 5 before triggering the diversion outer ring 7. This avoids conflict between the two actions, preventing incomplete cleaning or diversion failure, and prevents the diversion outer ring 7 from prematurely activating before the spacer 611 has finished cleaning, ensuring effective cleaning. Simultaneously, the redundant length of the inclined slot 641 provides buffer space for the movement of the circular shaft 63, reducing rigid impact during power transmission and protecting the circular shaft 63 and the circular sleeve 72. The structural integrity is ensured by the following mechanism: When the circular shaft 63 moves, it first drives the spacer shaft 611 to clean the filter screen 5. When the circular shaft 63 moves to contact the circular sleeve 72 and squeezes its interior, the circular sleeve 72 is pressed and drives the circular ring 71 to move synchronously, thereby separating the magnetic ring 712 from the filter screen 5. After the magnetic ring 712 separates from the filter screen 5, its adsorption force on the circular ring 71 disappears. At this time, the tension generated by the stretched return spring 73 can pull the circular ring 71 back to its original position, completing the cycle. The adaptive action is achieved through precise adaptation of the mechanical structure, which not only improves the automation level of the equipment operation but also reduces the number of downtimes caused by the handling of debris during peak periods. At the same time, the timing control and buffer design reduce component wear and extend the service life of the equipment.

[0032] Reference Figures 3-7 The pressure-bearing component 9 includes a sliding plate 91 slidably connected inside the receiving tube 8, a return spring 92 connected between the sliding plate 91 and the receiving tube 8, a vertical rod 93 fixedly connected to the top of the sliding plate 91, and a rotating shaft 94 fixedly connected to the top of the vertical rod 93. The rotating shaft 94 is located inside the inclined slot 641. The elastic coefficient of the return spring 92 is greater than that of the reset spring 73.

[0033] Specifically, the rotating shaft 94 is fitted inside the inclined slot 641. This embedded fit enables the transmission connection between the pressure-bearing component 9 and the diverter plate 6, ensuring the accuracy and smoothness of power transmission. The spring coefficient of the return spring 92 is greater than that of the reset spring 73. After completing the triggering action, 92 can reliably drive the diverter plate 6 and the diverter outer ring 7 to reset synchronously, and can also stretch the reset spring 73. Firstly, the sliding plate 91 has movable space. When the material pressure rises due to the accumulation of debris at the filter screen 5, the liquid... Pressure is stably transmitted to the slide plate 91 through the inner mold 4, which in turn triggers the slide plate 91 to drive the vertical rod 93 and the rotating shaft 94 to move synchronously. This converts the linear movement of the pressure-bearing component 9 into the power to drive the flow-dividing baffle 6 to slide. The flow-dividing outer ring 7 will only be triggered after the flow-dividing baffle 6 has moved completely. This sequential control ensures the orderliness and timeliness of the flow-dividing components' movements, avoiding failure of material handling due to disordered component movements. Ultimately, it achieves coordinated linkage between flow-dividing and collection, significantly improving the stability of equipment operation.

[0034] Reference Figures 1-9 The extruder 1 is fixedly connected to a motor 101 at the end away from the outer mold tube 3. The bottom of the extruder 1 is provided with a bottom box 102. The hot melt 2 is provided with a material port 21 at the top of the side near the motor 101.

[0035] The working principle of this invention is as follows: When impurities accumulate on the surface of the filter screen 5, the resistance to material flow increases, and the material pressure inside the outer mold tube 3 rises sharply. The pressure is transmitted to the pressure bearing component 9 through the inner mold 4. The sliding plate 91 is pushed by the pressure, overcoming the elastic force of the return spring 92 and sliding along the inside of the receiving tube 8, driving the vertical rod 93 and the rotating shaft 94 to move synchronously. When the rotating shaft 94 slides in the inclined groove 641 of the strip 64, the linear movement of the pressure bearing component 9 is converted into the power to drive the axial sliding of the entire diversion partition 6 through oblique extrusion. The entire diversion partition 6 moves closer to the filter screen 5 along the axial direction of the outer mold tube 3. At this time, the partition shaft 611 is inserted into the inner ring filter hole 501 of the filter screen 5 to mechanically clean the impurities blocking the hole and clear the inner ring flow channel. Then, the round shaft 63 contacts and squeezes the round sleeve 72, driving the round ring 71 to move synchronously, so that the magnetic ring 712 is separated from the filter screen 5, and the round ring 71 is released. The fixed state allows the sealing shaft 711 to disengage from the outer ring filter hole 502, opening the outer ring filter hole 502. The material flow path switches from the single channel of the inner ring filter hole 501 to the outer ring filter hole 502. Meanwhile, the ring 71 pushes the debris accumulated on the surface of the filter screen 5, guiding it along the inner wall of the outer mold tube 3 to the collection tube 8 for collection, avoiding secondary blockage by debris. After the flow path expands, the pressure at the filter screen 5 drops rapidly. After the filter screen 5 is depressurized, the return spring 92 pulls the slide plate 91 to reverse and reset, driving the diversion partition 6 to reset as a whole. At this time, the partition shaft 611 exits the inner ring filter hole 501, and the through slot 601 returns to normal flow. The round shaft 63 pulls the round sleeve 72 back, stretching the reset spring 73. The sealing shaft 711 re-embeds into the outer ring filter hole 502 and closes it. The magnetic ring 712 is once again attracted and fixed to the filter screen 5, waiting for the next pressure trigger to achieve automated operation of self-cleaning cycle.

[0036] Example 2, refer to Figures 1-9 The second embodiment of the present invention provides a molding production line for producing plastic pipes, which includes a molding device for producing plastic pipes, as well as raw material processing equipment, cooling and shaping equipment, traction system, and cutting and storing equipment. The raw material processing equipment is used to adjust the raw materials to a suitable state and includes a drying and mixing device and a feeding and conveying device. The shaping and cooling system is used to solidify the pipe blank to a set size to ensure accuracy and includes a shaping device and a cooling device. It uses segmented water tanks and spray cooling. At the same time, the traction system always pulls the pipe at a uniform and stable speed to match the extrusion speed. Subsequently, the finished product is processed by cutting and winding.

[0037] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A molding apparatus for producing plastic pipes, comprising an extruder (1), characterized in that: It also includes a hot melt assembly (2) fixedly sleeved outside the extruder (1), an outer mold tube (3) fixedly connected to one end of the hot melt assembly (2), an inner mold (4) disposed inside the outer mold tube (3), a filter screen (5) fixedly connected inside the outer mold tube (3), a flow divider (6) and a flow divider outer ring (7) slidably connected inside the outer mold tube (3), a receiving tube (8) fixedly connected below the outer mold tube (3), and a pressure bearing component (9) disposed inside the outer mold tube (3). One end of the inner mold (4) is connected to the filter screen. The filter screen (5) is fixedly connected, the flow divider (6) is located on one side of the filter screen (5), the flow divider outer ring (7) is located on the side of the filter screen (5) close to the extruder (1), the pressure bearing member (9) is connected between the inner mold (4) and the receiving tube (8), the flow divider (6) includes an initial position, when the pressure bearing member (9) is not moved, the flow divider (6) is located in the initial position, when the pressure bearing member (9) moves, the flow path of the filter screen (5) is changed through the flow divider (6) and the flow divider outer ring (7).

2. The molding apparatus for producing plastic pipes according to claim 1, characterized in that: The filter screen (5) has filter holes (51), which are divided into inner ring filter holes (501) and outer ring filter holes (502). The number of inner ring filter holes (501) and outer ring filter holes (502) is equal. The outer mold tube (3) has a tapered section (31) inside, and the diameter of the tapered section (31) decreases as it moves away from the filter screen (5).

3. The molding apparatus for producing plastic pipes according to claim 2, characterized in that: The diversion partition (6) includes a disc (61) slidably connected inside the outer mold tube (3), an arc strip (62) fixedly connected to the disc (61), a round shaft (63) fixedly connected to the arc strip (62), and a strip (64) fixedly connected to the bottom of the round shaft (63).

4. The molding apparatus for producing plastic pipes according to claim 3, characterized in that: The disc (61) has multiple spacers (611) on the side near the filter screen (5). The disc (61) has a through slot (601). The arc strip (62) passes through the middle of the filter screen (5). The strip (64) has an oblique slot (641). When the disc (61) is in the initial position, the spacers (611) do not contact the filter screen (5).

5. The molding apparatus for producing plastic pipes according to claim 4, characterized in that: The diversion outer ring (7) includes a circular ring (71) slidably connected inside the outer mold tube (3), a circular sleeve (72) fixedly connected to the circular ring (71), and a reset spring (73) connected between the circular ring (71) and the outer mold tube (3). The circular ring (71) is provided with a plurality of sealing shafts (711) on the side near the filter screen (5). The number of sealing shafts (711), inner ring filter holes (501) and through slots (601) are equal. The positions of the through slots (601) and the inner ring filter holes (501) correspond one-to-one. The positions of the sealing shafts (711) and the outer ring filter holes (502) correspond one-to-one.

6. The molding apparatus for producing plastic pipes according to claim 5, characterized in that: A magnetic ring (712) is provided on the side of the ring (71) near the filter screen (5). A horizontal groove (721) is opened at the bottom of the sleeve (72). The magnetic force of the magnetic ring (712) when it is attracted to the filter screen (5) is greater than the elastic coefficient of the return spring (73). When the disc (61) is in the initial position, the sealing shaft (711) is located inside the outer ring filter hole (502).

7. The molding apparatus for producing plastic pipes according to claim 6, characterized in that: The strip (64) passes through the magnetic ring (712). When the disk (61) is in the initial position, the distance between the circular shaft (63) and the circular sleeve (72) is less than the horizontal length of the inclined slot (641), and the distance is greater than the distance between the spacer shaft (611) and one side of the filter screen (5).

8. The molding apparatus for producing plastic pipes according to claim 5, characterized in that: The pressure-bearing component (9) includes a sliding plate (91) slidably connected inside the receiving tube (8), a return spring (92) connected between the sliding plate (91) and the receiving tube (8), a vertical rod (93) fixedly connected to the top of the sliding plate (91), and a rotating shaft (94) fixedly connected to the top of the vertical rod (93). The rotating shaft (94) is located inside the inclined slot (641), and the spring force coefficient of the return spring (92) is greater than that of the reset spring (73).

9. The molding apparatus for producing plastic pipes according to claim 1, characterized in that: The extruder (1) is fixedly connected to a motor (101) at one end away from the outer mold tube (3). The bottom of the extruder (1) is provided with a bottom box (102). The top of the hot melter (2) near the motor (101) is provided with a material port (21).

10. A molding production line for producing plastic pipes, comprising the molding apparatus for producing plastic pipes as described in claim 1, characterized in that: It also includes raw material processing equipment, cooling and shaping equipment, traction systems, and cutting and storage equipment.

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